EA008896B1 - Method of joining thermoplastic multilayer materials and machine for its implementation - Google Patents

Abstract

The invention relates to the technology and equipment for the manufacture of multilayer items from sheet thermoplastic materials and can be mostly applied in the assembling of filtering and sorbent materials by single-stage spot heat welding during the making of respiratory personal protective devices, chiefly lightweight respirators.The method includes heat pressing of thermoplastic sheet layers with 1) thermoelectrodes placed along the perimeter of layers and 2) non-heated press tips with convex surface. The tips are made from elastic material and have cross-section area which is 1.1-1.4 times the thermoelectrodes surface.The machine comprises a frame, electric driving motor installed on the frame, central column unit interacting with the motor. A cantilever with a shaping head, a press plate and a bar is joint to the column. The machine also includes a shaper fixed on the frame. The shaper incorporates a heater with welding edge in the form of a batch of thermoelectrodes; a plate with holes punched opposite the thermoelectrodes; flange with a ring; a rim with key levers provided with press tips; and spring supports mounted opposite the key levers. The press tips are placed in the radial mortises of the rim. The tips are made from elastic material, have convex surface and cross-section area which is 1.1-1.4 times the thermoelectrodes surface. The invention enhances the quality of produced protective masks, simplifies the construction of the equipment and improves its performance.

Description

The invention relates to technology and equipment for the manufacture of layered products from dissimilar sheet thermoplastic materials and can mainly be used when assembling into a package using the method of single-point thermal welding of woven and fibrous layers of filtering and sorption-filtering materials in the technological cycle of manufacturing individual respiratory protection, before all light respirators.

Among the methods of bonding laminated materials used in the manufacture of respirators, there is a known method of manually assembling a light respirator SB-1 Petal (Petal (Light respirators), Petryanov IV, et al., M., Nauka, 1984, p. 77, fig. 4.11, a), according to which the assembly of a layered filtering half mask of a respirator is performed by executing a sharp circular needle with a cotton thread with the stitches of the seam at an acute angle relative to the surface of the seam along the contour of the shutter of the half mask of the manual circular yarn. The disadvantages of this known method are the high complexity and low productivity, due to the manual technology of assembling a respirator.

The known method of machine assembly of a light respirator ShB-1 Petal (Petal (Light respirators), Petryanov IV, etc., M., Nauka, 1984, p. 77, Fig. 4.11, b), which provides for the implementation of the contour of the obturator a half mask of a machine circular thread seam with a thin needle and a cotton thread with the stitch position of the seam at a right angle to the surface of the half mask. This known method provides a reduction in labor intensity and an increase in productivity, but the punctures made by a needle at right angles to the surface are not filled with fibrous filter material and therefore become permeable to dispersed aerosol particles, which significantly reduces the protective filtering properties of the respirator.

A known method of assembling respiratory protective masks, implemented in a thermopress line for the manufacture of multi-layered facial parts of disposable protective masks (WI 2021139 C1, 1994), which provides for thermopressing using fastening along the contour of filtering and sorption filtering layers from dissimilar thermoplastic sheet materials using ultrasonic sound guides and sound receiving funnels.

This known method provides high performance assembly process respirators, due to the simultaneous execution of thermal welding, but it implements a heat press line for the manufacture of multilayer facial parts of protective masks for single use has a high cost of its manufacture and operation, due to the complexity of the design, significant energy consumption and significant dimensions.

The use of pairs of ultrasonic sound guides and sound-receiving funnels in this known method leads to significant heating of both of these elements and therefore causes burning during the pressing time of the outer layers of the laminated material adjacent to the sound leads and sound-receiving funnels, which leads to a decrease in the protective filtering properties of the protective mask being produced. Reducing the power of ultrasound exposure and, consequently, the heating temperature of sound guides and sound receiving funnels or the time of thermal pressing avoids sticking of the outer layers of the laminated material, but does not allow for the required heating of the compressible package of layers of thermoplastic material, which leads to a decrease in the strength of the resulting compound. In addition, the sound guides and sound-receiving funnels used in this known method under high temperature conditions are subject to intense oxidation, which leads to contamination of the resulting laminate with oxidation products. And finally, the inevitable stay of sheet thermoplastic materials in the assembly process under conditions of significant mechanical and thermal stresses leads to instability of the shape of the finished molded products. All this leads to a decrease in the quality of assembly of protective masks.

A known method of manufacturing respirators, implemented in the installation for the manufacture of respirators by thermal bonding (VI 2106161 C1, 1998), which provides for the manufacture of multilayer half masks of lightweight respirators from thermoplastic sheet filter materials and provides for the thermopressing of the half mask blank along its perimeter with two ring electrodes of the welding circuit, placed coaxially and plane parallel to each other and heated using electric heaters.

This known method provides a sufficiently high performance of the assembly process of respirators, and the plant implementing it for the manufacture of respirators by the method of thermal bonding has a relatively simple design, low power consumption and dimensions, which ensures low cost of its manufacture and operation.

However, the use of two heated annular electrodes of the welding circuit, which provide heating and pressing of a package of laminated material on both sides, when used in this method, can cause burning during the pressing time of the outer layers of the package adjacent to the electrodes of the welding circuit, which leads to a decrease in protective filtering properties manufactured respirator. Reducing the heating temperature of the pressing welding circuit or the time of thermal pressing allows you to avoid burning of the outer layers of the package of the layered material, but does not allow to provide the required heating of the pressed package, which leads to a decrease

- 1 008896 strength of the obtained compound. In addition, the use of not circular, but annular electrodes of the welding circuit during thermal pressing allows to obtain not a solid, but a solid connection located along the perimeter of the assembled respirator half mask. Such a continuous connection made around the perimeter of the half mask along the strip of obturation, due to the loss of flexibility and elastic properties as a result of thermal pressing, does not allow the use of a respirator for its intended purpose to ensure a reliable fit of the obturator to the user's face, which reduces the protective properties of the respirator. All this leads to an insufficiently high quality of manufactured respirators.

The closest in technical essence to the proposed method of bonding thermoplastic layered materials should be considered as a method of assembling light respirators, which is carried out in a known semi-automatic machine for assembling respirators (K.I. 2203115 C1, 2003). This known method of assembling light respirators, chosen for the closest analogue, involves dispensing a thermoplastic powdered polymer with a melting point of 100-150 ° C, for example, 0.2-0.6 mm polyvinyl acetate granules, filling doses of thermoplastic powdered polymer, usually in an amount 9-13 mg per blank of assembled respirator from sheet filtering and sorption filtering layers along its perimeter with a step of 10-15 mm and thermal pressing of the respirator blank in places where the doses of thermoplastic powder are powdered polymer for 0.5–5.0 s at a pressing pressure of 0.9–4.0 MPa and a temperature of 160–350 ° C using point metal thermoelectrodes, made in the form of a truncated cone, and unheated metal pressure tips located along the perimeter of the workpiece respirator with a pitch of 10-15 mm.

The specified known method provides high performance assembly process respirators, due to the simultaneous execution of spot heat sealing. Use during thermal pressing of point thermoelectrodes, made in the form of a truncated cone, allows to obtain a point connection of sheet filtering and sorption-filtering layers of a respirator half mask, made along its perimeter with a pitch of 10-15 mm. Such a point connection of layers, made around the perimeter of the mask along the strip, after thermal pressing, ensures that the respirator liner maintains flexibility and elastic properties and therefore a tight fit of the strip on the face of the user when using a respirator for the intended purpose, which increases the protective properties of the respirator. In addition, the use in the implementation of this known method of point thermoelectrodes located on one side of the half-mask of the respirator and located on the other side of the non-heated metal clamping tips eliminates sticking of the outer layers of the half-mask of the respirator from the clamping tips and reduces the likelihood of sticking from the thermoelectrodes, which increases the protective filtering properties of the manufactured respirator.

However, the use in the assembly method of light respirators, selected for the closest analogue, thermal pressing of the respirator blank with the help of flat metal working surfaces of the thermoelectrode and pressure tip of the keyboard lever, which can be rotated relative to the axis for pressing, on the one hand, requires periodic adjustment A well-known semi-automatic method for assembling respirators in order to ensure the parallelism of the planes of the working surfaces and the pressure tip during termopressovaniya. This leads to a decrease in the performance of the respirator assembly process due to the need for interruptions in the work of the semi-automatic machine for its adjustment, and also complicates the operation of the semi-automatic machine for assembling respirators and makes it more expensive. On the other hand, the inevitable disruption during operation of the well-known semi-automatic method of parallelism of the surfaces of the working surfaces of the thermoelectrode and pressure tip during thermal pressing causes them to skew and therefore reduces the area of their contact, resulting in a reduced quality of the respirator assembly.

In order to ensure the required strength of the resulting compound even when the parallelism of the planes of the working surfaces of the thermoelectrode and pressure tip during thermal pressing is violated, the authors of a known semi-automatic machine for assembling respirators, implementing the closest analogous method, used a thermoplastic powdered polymer poured onto the respirator billet at the joints and filling the gaps between the working surfaces of thermoelectrodes and pressure tips during therm pressing.

However, such an approach, firstly, required the supply of a semi-automatic machine for assembling respirators, implementing this known method, with a dosing unit for powdered polymer, which led to a significant complication of its design. Secondly, the use of a thermoplastic powdered polymer in a known method of assembling light respirators, selected for the closest analogue, leads to the fact that granules of this polymer inevitably fall into the gaps between the friction surfaces of the nodes implementing the semi-automatic method for assembling respirators, causing their premature wear and even breakage semi-automatic due to jamming of its moving parts. In addition, it

- 2 008896 requires more frequent maintenance of the semi-automatic device associated with cleaning its nodes from the granules of thermoplastic powdered polymer. And, thirdly, the use of a thermoplastic powdered polymer in the method of assembling light respirators leads to the fact that some of the non-melted granules of this polymer remain inevitably inside the masked respirator space. As a result, the quality of the assembled respirator is reduced, since when it is used for its intended purpose, granules of powdered polymer enter the user's respiratory organs and eyes, causing an allergic reaction and discomfort.

In addition, the use in the assembly method of light respirators, chosen for the closest analogue, for thermal pressing of pressure tips made of metal and therefore having high thermal conductivity, leads to intensive removal of heat pressure by pressure tips when performing a thermal connection . Such overheating of the thermoelectrode can cause burning of the contact with it when pressing the outer layer of the respirator half mask, which reduces the quality of the manufactured respirators.

Thus, the disadvantages of the known method of assembling light respirators, chosen for the closest analogue, are the insufficiently high quality of the manufactured respirators, as well as the complexity and insufficiently high performance properties of the equipment implementing it.

Among the equipment for bonding thermopressing layered materials in the manufacture of light respirators from the prior art known thermopress unit and thermopress line for the manufacture of multilayer facial parts of protective masks for single use (ΌΕ № 2717968, 1977, CB 2077112, 1981 and KI 2021139 C1, 1994), which are used for the manufacture of protective masks from thermoplastic sheet materials and in their common parts contain a material supply unit, a thermal cyclic system, a set of layer set, a molding and pressing unit, a separate unit LCI edge cutoff block assemblies and receiver assemblies fin drive.

These well-known unit and lines have a high cost of their manufacture and operation, due to the complexity of their design, significant power consumption and significant dimensions. In addition, the inevitable stay of sheet thermoplastic materials in the assembly process under conditions of substantial mechanical and thermal stresses leads to instability of the shape of the finished molded products.

Also known installation for the manufacture of respirators by the method of thermal bonding (KI 2106161 C1, 1998), which provides for the manufacture of multilayer half masks of light respirators from sheet thermoplastic filter materials by thermal pressing. This installation includes a frame in the form of a bed, a drive with electrical equipment, a forming nest with a supporting table in the form of a support plate mounted on a frame on a shock absorber, a node of a movable column mounted in a frame in the form of a main rod, installed with the possibility of axial movement and interacting with the drive, mounted on the main rod cantilever lever mounted on the cantilever lever above the forming socket coaxially and plane-parallel to the support table the forming head with pressure plate is placed s in the support table and the press plate and heaters disposed on the contacting surfaces of the support table and the press plate on the perimeter of the welding circuit.

This well-known installation has a relatively simple design, low power consumption and dimensions, which ensures a reduction in the cost of its manufacture and operation compared with the analogues listed above.

At the same time, substantial mechanical and thermal stresses, to which sheet thermoplastic materials are subjected in the process of thermal pressing, lead to instability of the form of ready-made respirators. This causes a decrease in the protective properties of the manufactured respirators, due in this case to a loose face of the user’s respirator with the edge of the half-mask of the respirator.

Improving the protective filtering properties of the respirator by increasing the stability of its shape allows the internal spacer to be placed in it and the obturator with a rubber cord with a metal nose clip, as provided by the designs of most light respirators, for example, type SB-1 Petal, is located along the edge of the half-mask. (Petal (Light respirators), Petryanov IV, and others. M., Science, 1984, pp. 58-59) and Alina (KI 2170607 C1, 2001, KI 21525 I1, 2002, KI 44516 I1, 2005, IA 9143, 2005). However, the known installation for the manufacture of respirators by the method of thermal bonding does not allow the placement of the inner spacer in the manufactured respirator and the formation of the obturator with a cord and nose clip. These actions should be performed in the process of other technological operations and on other equipment, which indicates a low level of automation of the process of assembling respirators.

The use of two electric heaters placed in the support table and pressure plate and located on the contacting surfaces of the support table and pressure plate around the perimeter of the welding circuit, which provides heating and pressing of the package of laminated material on both sides, can cause the pressure adjacent to the welding to be pressed during this pressing.

- 3 008896 contour of the outer layers of the package and their damage, which leads to a decrease in the protective filtering properties of the manufactured respirator. A decrease in the heating temperature of the pressing welding circuit or the pressing time avoids the sticking of the outer layers of the laminate package, but does not allow for the required heating of the compression package, which leads to a decrease in the strength of the resulting compound.

In addition, the use in this known installation for thermal pressing is not a point, but annular electrodes of the welding circuit allows to obtain not a point, but a continuous ring connection located along the perimeter of the assembled respirator half mask. Such a continuous connection made around the perimeter of the half mask along the strip of obturation, due to the loss of flexibility and elastic properties as a result of thermal pressing, does not allow the use of a respirator for its intended purpose to ensure a reliable fit of the obturator to the user's face, which reduces the protective properties of the respirator. All this leads to an insufficiently high quality of manufactured respirators.

When pressing the respirator blank between the support table and the pressure plate using a cantilever lever mounted on the main rod, force closures during the installation operation leads to a misalignment and flatness of the pressure plate installation relative to the support table, which causes the deflection of the pressure mask along the welding circuit from nominal values and therefore leads to a decrease in the strength of the resulting compound and quality Borki respirator. This requires periodic adjustment work at the installation and stops the respirator assembly process, which significantly complicates the operation of such installations and reduces the productivity of the respirator assembly process.

Therefore, the disadvantages of this known installation for the manufacture of respirators by thermal bonding are insufficiently high quality of assembly of respirators, low level of automation and insufficient performance of the technological process of assembly, as well as the complexity of operation of the installation.

The closest in construction to the device for implementing the method of bonding thermoplastic layered materials, which is the subject of the present invention, should be considered a semi-automatic machine for assembling respirators (WI 2203115 C1, 2003). This semiautomatic device for assembling respirators contains a frame, a drive with electrical equipment, a main stem assembly mounted on the base, in cooperation with a drive, a console arm mounted on the main stem, a forming head mounted on a console arm, with a pressure plate, a polymer powder dosing unit and a stem fixed in a presser plate and a cantilever arm, and a forming nest mounted on a bed, containing a supporting table, a heater, a welding circuit, a flange with a ring, located in cooperation with the drive and mounted with the possibility of axial movement, an annular frame mounted on a bed with key levers with pressure tips located in the radial grooves of the ring frame and spring-loaded stops mounted on the flange ring opposite the keyboard levers. In this case, the welding circuit is made in the form of a set of point thermoelectrodes and is installed on the heater, the heater is installed under the supporting table of the forming nest, the supporting table of the forming nest is mounted on the frame on the springs and in the supporting table there are holes opposite the point thermoelectrodes of the welding circuit.

This known semiautomatic device for assembling respirators, chosen for the closest analogue, ensures high productivity of the assembling process of respirators, due to the simultaneous performance of spot heat sealing. The use of thermal thermoelectrodes made in the form of a truncated cone in it allows to obtain a point connection of sheet filtering and sorption-filtering layers of a respirator half mask, made along its perimeter with a step of 10-15 mm. Such a point-like connection of layers, made around the perimeter of the half mask along the obturation strip, ensures that the respirator obturator after thermal pressing has preserved flexibility and elastic properties and therefore a snug fit of the obturation strip to the user's face when using the respirator for the intended purpose, which enhances the protective properties of the respirator. In addition, the use of point thermoelectrodes in a semiautomatic device for assembling respirators, which are located on one side of a half mask of a respirator and located on the other side of unheated metal pressure tips eliminates the burning of the outer layers of the half mask mask of a respirator from the side of the pressure tips and reduces the likelihood of them burning from the thermoelectrodes, which increases the protective filtering properties of the manufactured respirator.

At the same time, using a semi-automatic machine for assembling respirators, selected for the closest analogue, thermal pressing the respirator blanks with the help of flat metal working surfaces of thermoelectrodes and pressure tips of the keyboard levers installed with the possibility of rotation relative to their axes for pressing, on the one hand, requires periodic adjustment semi-automatic machine for assembling respirators in order to ensure parallelism

- 4 008896 bones of working surfaces of thermoelectrodes and pressure tips during thermal pressing. This leads to a decrease in the performance of the respirator assembly process due to the need for interruptions in the work of the semi-automatic machine for its adjustment, and also complicates the operation of the semi-automatic machine for assembling respirators and makes it more expensive. On the other hand, the inevitable disruption during operation of the semiautomatic device of parallelism of the planes of the working surfaces of the thermoelectrode and the pressure tip during thermal pressing causes their distortion and therefore leads to a decrease in the area of their contact, as a result of which the strength of the respirator is reduced.

In order to ensure the necessary strength of the resulting compound even when the parallelism of the planes of the working surfaces of thermoelectrodes and pressure tips during thermal pressing is violated, the authors of this known semi-automatic machine for assembling respirators, which is the closest analogue, provided for the use of a thermoplastic powdered polymer poured onto the respirator billet at the places of thermal connections and filling gaps between the working surfaces of thermoelectrodes and pressure tips s during thermopressing.

However, such an approach, firstly, required the supply of a known semi-automatic machine for assembling respirators with a dosing unit for powdered polymer, which led to a considerable complication of its design. Secondly, when using a semi-automatic machine for assembling respirators, chosen for the closest analogue, a thermoplastic powdered polymer causes the granules of this polymer to inevitably fall into the gaps between the friction surfaces of the semi-automatic units for assembling respirators, causing their premature wear and even breakage of the semi-automatic due to jamming of its mobile nodes. In addition, it requires more frequent maintenance of the semiautomatic device associated with the cleaning of its components and the removal of granules of thermoplastic powdered polymer. And, thirdly, when using a semi-automatic machine for assembling respirators of a thermoplastic powdered polymer during operation, some of the unmelted granules of this polymer inevitably remain inside the masked space of a manufactured respirator. As a result, the quality of the assembled respirator is reduced, since when it is used for its intended purpose, granules of powdered polymer enter the user's respiratory organs and eyes, causing an allergic reaction and discomfort.

In addition, the use of a semiautomatic device for assembling respirators, selected for the closest analogue, for thermal pressing of pressure tips made of metal and therefore having high thermal conductivity, leads to intensive removal of heat pressure by pressure tips when performing a thermal connection . Such overheating of the thermoelectrode can cause burning of the contact with it when pressing the outer layer of the respirator half mask, which reduces the quality of the manufactured respirators.

Therefore, the disadvantages of the known semi-automatic machine for assembling respirators, chosen for the closest analogue, are the insufficiently high quality of the manufactured respirators, as well as the complexity of its design and insufficiently high performance properties.

The objectives of the present invention are to improve the quality of manufactured respirators, as well as simplifying the design and improving the performance properties of the equipment used for the manufacture of respirators.

The tasks are solved according to the present invention, firstly, in that the method of bonding thermoplastic layered materials, including, in accordance with the closest analogue, thermal pressing of thermoplastic sheet layers using thermoelectrodes and non-heated pressure tips located along the perimeter of the sheet the fact that the use of clamping tips with a convex working surface, made of elastic material and having a cross-sectional area envy, exceeding 1.11.4 times the area of the working surface of the thermoelectrode. When using pressure tips, for example, from an elastic material with a Shore hardness of 30-50, use pressure tips, for example, with a spherical working surface, use thermoelectrodes, for example, with a flat working surface having the shape of a circle and made, for example, from non-oxidizing metal, and thermal pressing is produced, for example, at a pressure of 1.0-9.8 MPa for a time of 0.2-3.0 s.

Use in the method of bonding thermoplastic layered materials for thermal pressing of the pressing tips with a convex working surface, for example with a spherical working surface, which are made of an elastic material, for example, with a shore hardness of 30-50, and have a cross-sectional area exceeding 1 , 1-1.4 times the area of the working surface of a thermoelectrode, for example, with a flat working surface, having the shape of a circle and made of a non-oxidizing metal, provides an increase in the quality of manufacturing respirators, as well as simplifying the design and improving the performance properties of the equipment used for the manufacture of respirators. Moreover, this technical result is achieved in the most

- 5 008896 to a greater extent, when thermal pressing is carried out at a pressure of 1.0-9.8 MPa for a time of 0.2-3.0 s. This is confirmed by the following considerations.

Use in the method of bonding thermoplastic layered materials during thermal pressing of the respirator billet of the pressure tips made of elastic material leads to the fact that the pressure tips pressing the pressing surfaces of thermoelectrodes elastically deform in accordance with the shape, size and position relative to them surfaces of thermoelectrodes. During pressing, this ensures contact of the deformed working surface of each pressure tip through the respirator blank with the entire working surface area of each corresponding thermoelectrode even in case of deviation of the relative position of the working surfaces of the pressure tips and thermoelectrodes from the nominal caused by improper adjustment of the device for implementing this method during its operation. This circumstance allows adjustment of the device for the implementation of this method less often. On the one hand, this leads to an increase in the productivity of the respirator assembly process, since it reduces the number of forced interruptions to adjust the device, and also simplifies the operation of the device implementing the present method and makes it less expensive. On the other hand, provided in this case, the contact of the deformed working surface of each pressure tip through the respirator blank with the entire working surface area of each corresponding thermoelectrode does not reduce the area of their interaction, even if there is a skew, as a result of which the area of each compound obtained does not decrease, but increases the strength of the compound obtained and therefore the quality of the respirator assembly.

The noted circumstances made it possible, without prejudice to the strength of the compound obtained, to abandon the use in the implementation of the present invention of a thermoplastic powdered polymer, which is poured on the respirator blank in the places where the thermocouplings are made. As a result, compared with the closest analogue, firstly, the design of the device implementing the method has been significantly simplified due to the lack of a dosing unit of the polymer powder in it. Secondly, this eliminated the possibility of granules of powdered polymer in the gaps between the friction surfaces of the units implementing this method, which would cause their premature wear or breakage due to jamming. For the same reason, the maintenance of a device implementing method may be less frequent. All this provided an improvement in the performance properties of the device implementing the method. And, thirdly, the rejection of the use of thermoplastic powdered polymer ensures the absence of unmelted granules of this polymer inside the masked space of a manufactured respirator. As a result, the allergic reaction and discomfort of the respirator user are eliminated due to the possible ingress of powdered polymer into its respiratory organs and eyes, which greatly improves the quality of the assembled respirator.

In this case, the use of pressure tips made of an elastic material with a convex working surface, for example, spherical in shape, during thermal pressing ensures a more uniform distribution of the pressing pressure over the area of each point connection being made. Firstly, this leads to an increase in the strength of the compound obtained, and, secondly, prevents the possibility of damage or sticking of the respirator billet to thermoelectrodes, in contrast to the case when, due to the uneven distribution of the pressing pressure, local areas with an increased pressure. This feature of the proposed method also provides improved quality manufactured respirators.

Use in the method of bonding thermoplastic layered materials for thermal pressing of the pressure tips, which are made of elastic material, for example, with a shore hardness of 30-50, and have a cross-sectional area exceeding 1.1-1.4 times the working surface area of the thermoelectrode , leads to the fact that under the action of a pressing pressure of 1.0–9.8 MPa, the pressure tips not only elastically deform, but in the process of deformation they start to slightly cover their deformed sections ochimi surfaces not only flat work surfaces thermoelectrodes having, for example, a circular shape, but the upper area of the side surfaces thermoelectrodes together with the workpiece placed respirator providing creating compression pressure thereon due to its elastic properties. As a result of this, the area of the compound obtained increases even more and, therefore, its strength increases, which ensures an increase in the quality of the manufactured respirators.

In addition, the use in the method of bonding thermoplastic layered materials for thermal pressing of the pressure tips made not of metal having high thermal conductivity, but of elastic material, prevents the heat pressure from discharging the heat pressure tips when performing the thermal connection, allowing for a strong connection not to overheat the thermal electrode, may cause burning in contact with it when pressing the outer layer of the respirator's mask, which increases the quality manufactured in respirators.

- 6 008896

The quantitative values characterizing the present method of bonding thermoplastic laminates are obtained by the authors of the present invention by experiment and are the most acceptable. At the same time, the use of clamping tips with a cross-sectional area less than 1.1 times the working surface of the thermoelectrode does not allow to provide the required coverage of not only the flat working surfaces of thermoelectrodes with the deformed working surfaces, but also the upper areas of the side surfaces of the thermoelectrodes together with the placed respirator billet, which leads to a decrease in the area of the joint and reduce its strength. The use of clamping lugs with a cross-sectional area exceeding the working surface of the thermoelectrode by more than 1.4 times is also not advisable, since it does not provide a noticeable increase in the strength of the compound obtained, but due to an excessive increase in the area of the compound obtained leads to a loss of obturator flexibility and elastic properties, which reduces the protective properties of the manufactured respirator due to the loose fit of its strip to the face of the user when pr respirator name.

The use of a pressing pressure of less than 1.0 MPa does not allow for the necessary heating of the respirator blank and therefore ensure the strength of the joint obtained. Pressing at a pressure above 9.8 MPa practically does not lead to an increase in the strength of the joint obtained, but it can cause damage to the outer layer of the respirator blank by the thermoelectric electrode.

At the specified pressing pressure range, use of pressure tips that are made of elastic material with a Shore hardness less than 30, deformed pressure tips do not provide the required pressing pressure of the respirator billet to the upper areas of the side surfaces of thermoelectrodes, which leads to a decrease in the strength of the compound. The use of clamping tips that are made of an elastic material with a Shore hardness of more than 50, does not allow to provide the necessary coverage of the deformed working surfaces of the upper areas of the side surfaces of thermoelectrodes together with the respirator blank placed, which leads to a decrease in the area of the connection and causes its strength to decrease.

Pressing at the specified pressing pressures for a time less than 0.2 s does not provide the necessary heating of the respirator billet, which reduces the strength of the joint, and pressing for more than 3 s can lead to the burning of the outer layer of the respirator billet to the thermoelectric, which reduces the quality of the produced respirator.

Marked indicates the solution of the above declared objectives of the present invention due to the presence of the proposed method of bonding thermoplastic laminated materials listed above distinctive features.

The tasks are solved according to the present invention, secondly, also by the fact that the device for bonding thermoplastic layered materials, containing, in accordance with the closest analogue, the frame, the drive with electrical equipment, mounted on the frame node of the main rod, which is in interaction with the drive, installed on the main rod cantilever lever mounted on a cantilever lever forming head with a clamping plate and rod mounted in the presser plate and the console arm, and mounted on the frame Forming nest, including a heater mounted on the frame, a welding circuit mounted on the heater as a set of thermoelectrodes, a support table with openings opposite the thermoelectrodes of the welding circuit mounted on the frame on the springs above the welding circuit, and mounted with the possibility of axial movement, mounted on the frame ring frame with keyed levers with pressure tips, placed in the radial grooves of the ring The evay rims, and spring-loaded stops mounted on the flange ring opposite the keyboard levers, differ from the closest analogue in that the pressure tips have a convex working surface and are made of elastic material with a cross-sectional area exceeding 1.1-1.4 times the area of the working surface thermoelectrode. At the same time, the pressure tips can be made of elastic material with a Shore hardness of 30-50, the pressure tips can be made with a spherical working surface, the thermoelectrodes can be made with a working surface from non-oxidizing metal, the thermoelectrodes can be made with a flat working surface, a circle-shaped flange can be provided with a rod that interacts with the actuator, the actuator can be performed that interacts with the main rod and the flange stem between Cams, the ring can be mounted on the flange using guide racks, the annular rim can be mounted on the bed with the help of racks, and the forming head can be equipped with a clamping plate mounted on the stem with axial movement of the cone clutch, which are angled sliders, elastic ring, covering and pressing the corner sliders to the conical surface of the cone clutch, and mounted on the console arm swinging lever, which is in mutual with a tapered coupling and a spring of tension that is spring-loaded in relation to the cantilever arm, and the clamping

- 7 008896 the stove can be equipped with hooks to accommodate the internal strut of the respirator, and on one side of each corner slider a groove can be made for accommodating the rubber cord of the respirator shutter.

Supplying the pressure tips of the device for bonding thermoplastic laminates with a convex working surface, for example a spherical working surface, and making them from an elastic material having a Shore hardness, for example, within 30-50, with a cross-sectional area exceeding 1.1-1 , 4 times the area of the working surface of a thermoelectrode, which is made, for example, with a flat working surface having the shape of a circle and made of a non-oxidizing metal, provides an increase in the quality of produced piratorov and simplify the design and improve the performance of the equipment used for the manufacture of a respirator. This is confirmed by the following considerations.

The use of the device for bonding thermoplastic layered materials for thermal pressing the respirator billet of the pressure tips made of elastic material causes the pressure tips pressing the pressing surfaces of the thermoelectrodes to be elastically deformed in accordance with the shape, size and position relative to these working surfaces of thermoelectrodes. When pressing, this ensures contact of the deformed working surface of each pressure tip through the respirator blank with the entire working surface area of each corresponding thermoelectrode even in case of deviation of the relative position of the working surfaces of the pressure tips and thermoelectrodes from the nominal caused by improper adjustment of the device for bonding thermoplastic laminates during its operation . This circumstance allows adjustment of the device for bonding thermoplastic laminates less frequently. On the one hand, this leads to an increase in the productivity of the respirator assembly process, since it reduces the number of forced interruptions in work to adjust the device for bonding thermoplastic laminates, as well as simplifies its operation and makes it less expensive. On the other hand, provided in this case, the contact of the deformed working surface of each clamping tip through the respirator blank with the entire working surface area of each corresponding thermoelectrode, even if a skew occurs, does not reduce the area of their contact, as a result of which the resulting compound does not decrease, but increases the strength of the compound obtained and therefore the quality of the respirator assembly.

These circumstances allowed, without prejudice to the strength of the resulting compound layers of the respirator billet, to abandon the use in the construction of the proposed device for bonding thermoplastic layered materials of thermoplastic powdered polymer, poured onto the respirator billet at the points of thermal connections. As a result of this, compared with the closest analogue, firstly, the design of the proposed device for bonding thermoplastic laminated materials has been significantly simplified due to the lack of a dosing unit for the powdered polymer in it. Secondly, it eliminated the possibility of granules of powdered polymer in the gaps between the friction surfaces of the nodes of this device, which would cause their premature wear or breakage due to jamming. For the same reason, the maintenance of the proposed device for bonding thermoplastic laminates can be performed less frequently. All this has provided an improvement in the performance properties of the proposed device for bonding thermoplastic layered materials. And, thirdly, the rejection of the use of thermoplastic powdered polymer ensures the absence of unmelted granules of this polymer inside the masked space of a manufactured respirator. As a result, the allergic reaction and discomfort of the user when using a respirator due to the possible ingress of powdered polymer into his respiratory organs and eyes, are excluded, which greatly improves the quality of the assembled respirator.

The use of the proposed device for bonding thermoplastic layered materials during thermal pressing of the pressure tips made of elastic material having a convex working surface, for example spherical in shape, provides a more uniform distribution of pressing pressure over the area of each connection to be made. First, this leads to an increase in the strength of the compound obtained, and, secondly, prevents the possibility of damage or sticking of the respirator billet to thermoelectrodes, unlike the closest analogue, when, due to the uneven distribution of the pressing pressure, local areas with overpressure. This design feature of the proposed device for the bonding of thermoplastic laminates also improves the quality of manufactured respirators.

Use in the design of the proposed device for bonding thermoplastic layered materials for thermal pressing of the pressure tips, which are made of elastic material, for example, with a shore hardness of 30-50, and have a cross-sectional area exceeding 1.1-1.4 times the area the working surface of the thermoelectrode, leads to the fact that under the

Due to the pressing pressure, the pressure tips not only elastically deform, but in the process of their deformation they begin to slightly cover with their deformed working surfaces not only the flat working surfaces of thermoelectrodes having, for example, the shape of a circle, but also the upper regions of the lateral surfaces of thermoelectrodes together with the respirator blank placed, ensuring that the pressing pressure is created on the blank due to its elastic properties. As a result of this, the area of the compound obtained increases even more and, therefore, its strength increases, which ensures an increase in the quality of the manufactured respirators.

In addition, the use in the construction of the proposed device for bonding thermoplastic layered materials for thermal pressing of the pressure tips made not of metal with high thermal conductivity, but of elastic material with significantly lower thermal conductivity, prevents the pressure tips from discharging heat, allowing for durable connections do not overheat the thermoelectrode, which can cause sticking of m in pressing contact with the outer layer half-mask respirator that improves the quality of manufactured respirators.

Characterizing the design of the proposed device for bonding thermoplastic laminated materials quantitative values obtained by the authors of the present invention empirically and are the most acceptable. The use of clamping tips with a cross-sectional area exceeding the working surface of the thermoelectrode less than 1.1 times, does not allow to provide the necessary coverage of the deformed working surfaces not only of the flat working surfaces of thermoelectrodes, but also the upper areas of the lateral surfaces of thermoelectrodes together with the placed blank respirator, which leads to a decrease in the area of the obtained compound and a decrease in its strength. The use of clamping lugs with a cross-sectional area exceeding the working surface of the thermoelectrode by more than 1.4 times is also not advisable, since it does not provide a noticeable increase in the strength of the compound obtained, but due to an excessive increase in the area of the compound obtained, the obturator is lost flexibility and elastic properties, which reduces the protective properties of the respirator due to the loose fit of its strip of obturation to the user's face when respirator.

When using clamping lugs that are made of an elastic material with a Shore hardness of less than 30, deformed clamping lugs do not provide the required pressing pressure of the respirator billet to the upper areas of the side surfaces of thermoelectrodes, which leads to a decrease in the strength of the compound. The use of clamping tips, which are made of an elastic material with a Shore hardness of more than 50, does not allow for the required coverage of the deformed working surfaces of the upper areas of the side surfaces of thermoelectrodes together with the respirator blank placed, which leads to a decrease in the area of the resulting compound and causes a decrease in its strength.

Marked indicates the solution declared above objectives of the present invention due to the presence of the proposed device for bonding thermoplastic layered materials listed above distinctive features.

FIG. 1 shows the design of the proposed device for bonding thermoplastic layered materials, which allows the proposed method of bonding thermoplastic layered materials, where 1 is the bed, 2 is the drive, 3 is the main stem assembly, 4 is the main stem, 5 is the console arm, 6 is the die head , 7 - pressure plate, 8 - pressure plate stem, 9 - forming nest, 10 - supporting table, 11 - flange, 12 - flange ring, 13 - flange rod, 14 - ring frame, 15 heater, 16 - guide bar of the supporting table , 17 - ring frame stand, 18 - direction flange pillar, 19 - electric motor, 20 - belt drive, 21 - worm gear, 22 - main shaft cam, 23 - flange rod cam, 24 - swing arm, 25 - swing arm spring, 26 - main stem spring and 27 - strut heater.

FIG. 2 shows the kinematic scheme of the proposed device for bonding thermoplastic layered materials, which allows the proposed method of bonding thermoplastic layered materials, where 28 is a keyboard lever, 29 is a pressing tip, 30 is a spring-loaded stop, 31 is a tapered coupling, 32 is an angled slider, 33 is elastic ring, 34 - clamping plate hook, 35 - groove of the angle slider, 36 - rack of the main stem assembly, 37 - flange spring, 38 - swing corner arm, 39 - corner lever spring, 40 - folding tongue, 41 - tongue spring ka, 42 is the first stop, 43 is the second stop, 44 is the main stem plug, 45 is the main shaft roller, 46 is the rod plug, 47 is the rod roller, 48 is the welding circuit thermoelectrode, 49 is the bumper ring and 50 is the support table spring .

FIG. 3 shows the design of the forming head 6 with a cantilever arm 5 and the main rod

four.

FIG. 4 shows the design of the forming socket 9.

FIG. 5 shows the thermoelectrode 48 of the welding circuit and the key lever 28 with the clamping tip 29 at the beginning of the movement of the key lever 28 before performing the heat pressing of the button

- 9 008896 for layered materials, where 51 is the working surface of the pressure tip, 52 is the working surface of the thermoelectrode, 53 is the lateral surface of the thermoelectrode, and 54 is the respirator blank.

FIG. 6 shows the thermoelectrode 48 of the welding circuit and the keyboard lever 28 with the pressing tip 29 at the stage of performing the thermal pressing of the preform of laminated materials.

The proposed device for bonding thermoplastic layered materials, which allows the proposed method of bonding thermoplastic layered materials, contains a frame 1, on which the drive 2 with electrical equipment, the node 3 of the main rod and the forming slot 9. The drive 2 is placed in the lower part of the frame 1 and contains an electric motor 19, a worm gear 21, on the output shaft of which the cam 22 of the main rod and the cam 23 of the flange stem are mounted, and a belt drive 20 connecting the electric motor 19 to the worm gear gearbox 21. The node 3 of the main stem is installed on the top plate of the frame 1 and consists of the main stem 4, which is spring-loaded relative to the upper plate of the base 1 by the spring 26 of the main stem and mounted with a running fit in the frame formed by two racks 36 of the main stem assembly and rigidly fixed on the top plate of the bed 1. At the lower end of the main stem 4, a fork 44 of the main rod is installed with a roller 45 of the main rod, which allows the cam 22 of the main rod to run in.

On the upper part of the main rod 4, a cantilever arm 5 is fixed, on which a forming head 6 is installed by means of the rod 8 of the pressure plate, which contains a pressure plate 7 fixed on the rod 8 of the pressure plate and mounted on the pressure rod 8 of the pressure plate 31. On the bottom The side of the pressure plate 7 is diametrically opposed to two hooks 34 of the pressure plate to accommodate the internal strut of the respirator, and in its radial grooves are angled sliders 32, covered and pressed against the outer There is a tapered surface of the tapered coupling 31 with an elastic ring 33. On the horizontal side of each corner slider 32, a groove 35 of the corner slider is made to accommodate a respirator rubber cord cord.

On the cantilever arm 5 is installed using a swivel swing arm 24, which is in cooperation with the tapered coupling 31 by means of a fork, spring-loaded relative to the cantilever arm 5 by the spring 25 of the swing arm (tension spring) and locked in the lower position by the vertical end of the angled swing arm 38, the hinge mounted on the side surface of the cantilever lever 5 and spring-loaded corner lever spring 39 (tension spring). At the horizontal end of the corner swing arm 38 is installed with the possibility of rotation of the folding tongue 40, the spring-loaded spring 41 tongue (tension spring). The first stop 42 and the second stop 43 are mounted on the frame formed by the two racks 36 of the main stem assembly. The folding tongue 40 is mounted so that during the course of the cantilever arm 5 with the die head 6 down, it turns to the first stop 42, skipping the first the stop 42, and when the cantilever lever 5 with the forming head 6 returns, rested up against the first stop 42 and therefore turned the swivel lever 38 in the hinged connection relative to the cantilever lever 5, releasing the swinging lever 24.

The forming nest 9 is mounted on the top plate of the bed 1 and contains a ring-shaped electric heater 15, which is mounted on the top plate of the bed 1 by means of the racks 27 of the heater and is equipped with thermoelectrodes 48 arranged in a circle in increments of 10 to 15 mm, for example a truncated cone with a flat working surface 52 of a thermoelectrode made of a non-oxidizing metal, for example, stainless steel, in the shape of a circle with a diameter of 3-6 mm. The device uses 44 thermoelectrodes 48 of the welding circuit. The forming nest 9 also contains a supporting table 10, which is installed by means of a guide rack 16 of the supporting table on the upper plate of the bed 1 with axial displacement, spring-loaded with respect to the base 1 by the spring 50 of the supporting table and provided with holes opposite the thermoelectrodes 48 of the welding circuit of the heater 15, and an annular rim 14, which is mounted on the upper plate of the bed 1 with the help of the pillars 17 of the annular rim and provided mounted in its radial grooves on the axes with the possibility of rotation relative to them lavishnymi levers 28 with clamping lugs 29. The number of keyboards levers 28 equal to the number thermoelectrodes welding circuit 48, and their location is chosen so that when rotating levers 28 keyboards their clamping lugs 29 interact with thermoelectrodes welding circuit 48, for providing the necessary pressure termopressovaniya.

Clamp tips 29 are made with a convex working surface made of an elastic material, for example, rubber or fluoroplastic, with a Shore hardness of 30-50. The cross-sectional area of each clamping tip 29 in the plane perpendicular to its longitudinal axis was chosen to be 1.1-1.4 times greater than the area of the working surface of the thermoelectrode 48 of the welding circuit. According to the authors of the present invention, the most preferred is the implementation of the pressure tips 29 with a cylindrical side surface and with the working surface 51 of the pressure tip in the shape of a hemisphere. Taking into account the above possible values of the diameter of the circular working surface 52 of the thermoelectrode in this most preferred case, the radius of the cylindrical side surface of the pressure tip 29 and the working surface 51

- 10 008896 clamping tip has a value in the range from 1.6 to 3.6 mm.

In addition, the forming socket 9 contains a flange 11, which is installed in the upper plate of the frame 1 by means of flange posts 18 with axial displacement, spring-loaded relative to the frame 1 by flange springs 37 and provided with a flange stem 13, which is in contact with the rod plug 46 with allowing roller running around the cam 23 of the flange stem roller 47, as well as the flange ring 12 with spring-loaded supports 30 opposite the key levers 28 (according to the number of key levers 28), which is fixed to flange racks 18 and provided with a fender ring 49, which cooperates with the arms of the keyboard levers 28 opposite to their pressing tips 29. The pressing pressure necessary for implementing the proposed method of bonding thermoplastic layered materials is 1.0-9.8 MPa set by the spring stiffness of the spring-loaded stops 30.

In addition, the proposed device for bonding thermoplastic layered materials, which allows the proposed method of bonding thermoplastic layered materials, provided not shown in the figures two limit switches of the electric motor 19 of the drive 2, placed in the heater 15 with an electric heating element and a temperature sensor of the heater, as well as placed on frame 1 with heater temperature indicator, heater temperature controller, actuator start button 2 and timer, cat Oray sets the time for performing thermal pressing and allows you to set its desired value in the range of 0.2-3.0 s, as the proposed method provides.

The proposed device for bonding thermoplastic layered materials, which allows the proposed method of bonding thermoplastic layered materials, works as follows.

When the device is powered on to bond thermoplastic laminates, the heater 15 is heated. The operator working on the device controls the temperature of the heater 15 by the heater temperature indicator, sets the required value in the heater temperature controller, usually in the range of 160-350 ° C and sets the timer the required time of thermal pressing, which can be 0.2-3.0 s. The operator then pulls the rubber cord of the respirator obturator on the corner slider 32, placing it in the grooves 35 of the corner slider, installs the internal strut of the respirator on the hooks 34 of the pressure plate and lays on the support table 10 the blank 54 of the respirator in the form of folded into the package cut from 2 to 5 layers of filtering and sorption-filtering materials based on, for example, perchlorovinyl, polystyrene, polypropylene or polyester fibers, then pressing the start button of the drive 2 turns on the electric motor 19 .

The rotational movement of the shaft of the electric motor 19 by means of a belt drive 20, a worm gearbox 21, a cam 22 of the main stem, a cam 23 of a flange shaft, a roller 45 of the main shaft and a roller 47 of the rod is converted into a vertical translational motion of the main rod 4 with a cantilever arm 5 and a forming head 6 down under the action of the expandable spring 26 of the main stem, and the stem 13 of the flange with the flange 11 and the flange ring 12 upwards under the action of the cam 23 of the flange stem.

When the main stem 4 moves with the cantilever lever 5 and the forming head 6 down, the folding tongue 40, when interacting with the first stop 42, rotates, passes the first stop 42 and returns to its original position under the action of the spring 41 of the tongue, without causing the angle arm to rotate 38. movement of the forming head 6 down its pressure plate 7 comes into contact with the supporting table 10 and the respirator blank 54 on it, after which the supporting table 10 under the action of the forming head 6 also begins to move downward, compressing the spring 50 support table. When moving down the supporting table 10, the edges of the respirator blank 54 are bent up by the edges of the annular rim 14 to form the obturator. After the end of the vertical bending of the edges of the workpiece 54 of the respirator, the forming head 6 with the pressure plate 7 and the support table 10 stops in its lowest position when the support table 10 descends onto the surface of the heater 15 and the thermoelectrodes 48 of the welding circuit will enter the holes of the support table 10 and, rising above it surface will be in contact with the workpiece 54 respirator.

After this, the upward movement of the flange 11 and the flange ring 12 with spring-loaded stops 30 begins due to the impact on the stem 13 of the cam flange 23 of the flange stem. With this movement, the spring-loaded stops 30 mounted on the flange ring 12 act on the keyboard levers 28, which, turning around their axes, carry out the final bending of the edge of the respirator blank 54 into a horizontal position with the formation of a shutter, inside of which falls stretched on the corner slider 32 and placed in the slots 35 corner slider rubber cord obturator.

At the same time, as a result of the rotation, the keyboard levers 28 press with their pressing tips 29 extending between the corner sliders 32, the respirator blank 54 at the thermal pressing points to the thermoelectrodes 48 of the welding circuit, creating the pressing pressure necessary for the implementation of the proposed method within 1.0-9.8 MPa, determined by the stiffness of the springs of the spring-loaded stops 30.

- 11 008896

Under the pressure of pressing, the pressure tips 29, resting against the respirator blank 54 (see FIGS. 5 and 6) by the working surfaces 51 of the pressure tips on the working surfaces 52 of thermoelectrodes, are elastically deformed in accordance with the shape of the working surfaces 52 of thermoelectrodes, providing, during pressing, contact of each deformed working surface 51 of the pressure tip through the blank 54 of a respirator with the entire area of each corresponding working surface 52 thermoel ktroda. However, due to the elastic properties of the material of the pressure tip 29 and the spherical shape of the working surface 51 of the pressure tip, the pressing pressure on the workpiece 54 of the respirator is distributed fairly evenly within the area of the working surface 52 of the thermoelectrode. In addition, due to the excess of the cross-sectional area of the pressure tip 29 of the working surface area 52 of the thermoelectrode under the action of pressing pressure, each pressure tip 29 not only deforms elastically, but during its deformation begins to slightly cover the deformed working surface 51 of the pressure tip not only the working surface 52 of the thermoelectrode, but also the upper region of the side surface 53 of the thermoelectrode together with the respirator blank 54 placed, providing giving it press pressure due to its elastic properties.

Then, not shown in the figures, the limit switch breaks the power supply circuit of the electric motor 19 and the drive 2 stops for a predetermined time of 0.2-3.0 s and set by a timer to effect the thermal pressing of the respirator blank 54. In places of contact with the heated thermoelectrodes 48, the thermoplastic layers of the respirator blank 54 are partially melted and welded under the action of the pressing pressure. After holding for a predetermined pressing time, the timer re-activates the electric motor 19 of the actuator 2, as a result of which the flange 11 with the flange ring 12 will move downward under the action of the expanding flange springs 37 and the flange ring 49 of the flange ring 12 will turn the keyboard levers 28 to the initial position, stopping the pressing . When moving the main rod 4 with the cantilever arm 5 and the forming head 6 under the action of the cam 22 of the main rod upwards, the support table 10 released from the pressure of the pressure plate 7 will rise to its original position under the action of the expanding springs 50 of the support head and the assembled respirator will remain suspended on the presser plate 7 to the hooks 34 of the presser plate for the internal strut of the respirator and to the angular sliders 32 for the rubber cord and skidding in the slots 35 of the angled sliders torus

In the process of movement of the cantilever lever 5 up, as a result of the interaction of the folding tongue 40 with the first stop 42, the angular swinging arm 38 will turn and release the swinging arm 24 from fixation, which under the action of the compressing spring 25 of the swinging arm will rise and move the tapered coupling 31 upwards. Due to the rise of the cone clutch 31, the angled sliders 32 pressed to its conical surface by an elastic ring 33 will converge under the action of the latter, releasing the shutter of the assembled respirator from the horizontal ends of the angle sliders 32 and the rubber cord 35 inside the corner slots 35 and allowing the operator to remove the hooks 34 from the slots 35 clamping plate internal strut together with the assembled respirator without damaging its obturator and filtering layers of the half mask.

At the approach of the main rod 4 with the cantilever lever 5 and the forming head 6 to the extreme upper position, the swinging lever 24 abuts against the second stop 43 and as a result rotates downward, returning the cone clutch 31 to the extreme lower position on the rod 8 of the pressure plate. As a result, the corner swing arm 38 rotates under the action of the spring lever 39 of the corner arm and fixes the swing arm 24 in the lowest position, and also stops the electric motor 19 of the drive 2 by opening the limit switch not shown in the figures. After that, the semiautomatic device is ready for assembly of the next respirator, which occurs in a similar way.

The applicant has manufactured a prototype of the proposed device for bonding thermoplastic layered materials, which allows the proposed method of bonding thermoplastic layered materials. This prototype was tested on the production base of the applicant for the assembly of lightweight respirators type SB-1 Petal and Alina and showed high performance of the process and high quality assembly of these types of respirators.

Thus, the application of the proposed method of bonding thermoplastic layered materials and devices for its implementation provides improved quality manufactured respirators, as well as simplifying the design and improving the performance properties of equipment used for the manufacture of respirators.

Claims (17)

CLAIM 1. The method of bonding thermoplastic laminated materials, including thermal pressing of thermoplastic sheet layers using perimeter sheet layers of thermoelectrodes and unheated pressure tips, characterized in that they are used for - 12 008896 press tips with a convex working surface, made of elastic material and having a cross-sectional area that exceeds 1.1-1.4 times the working surface area of the thermoelectrode. 2. The method according to claim 1, characterized in that the use of clamping tips of elastic material with a shore hardness of 30-50. 3. The method according to claim 1, characterized in that the use of clamping tips with a spherical working surface. 4. The method according to claim 1, characterized in that use thermoelectrodes with a working surface made of non-oxidizing metal. 5. The method according to claim 1, characterized in that they use thermoelectrodes with a flat working surface having the shape of a circle. 6. The method according to claim 1, characterized in that the thermal pressing is carried out at a pressure of 1.0-9.8 MPa. 7. The method according to claim 1, characterized in that the thermal pressing is carried out for a time equal to 0.2-3.0 s. 8. A device for bonding thermoplastic laminated materials, comprising a bed, an electric drive, a base assembly of the main rod mounted on the bed in communication with the drive, a cantilever arm mounted on the main rod, a forming head mounted on the cantilever arm with a pressure plate and a rod fixed in pressure plate and cantilever arm, and a forming socket mounted on the bed, including a heater mounted on the bed, a welding circuit mounted on the heater in the form of the payback of thermoelectrodes, a support table mounted on the frame on springs above the welding circuit with holes made opposite to the thermoelectrodes of the welding circuit, a flange with a ring in cooperation with the drive and mounted with the possibility of axial movement, an annular frame mounted on the frame with key levers with pressure tips, placed in radial grooves of the annular frame, and spring-loaded stops mounted on the ring of the flange opposite the key levers, characterized in that nye lugs are provided with a convex working surface and is made of an elastic material with a cross sectional area exceeding 1,11,4 times in the working surface area thermoelectrode. 9. The device according to claim 8, characterized in that the pressure tips are made of elastic material with a shore hardness of 30-50. 10. The device according to claim 8, characterized in that the clamping tips are made with a spherical working surface. 11. The device according to claim 8, characterized in that the thermoelectrodes are made with a working surface of non-oxidizing metal. 12. The device according to claim 8, characterized in that the thermoelectrodes are made with a flat working surface having the shape of a circle. 13. The device according to claim 8, characterized in that the flange is equipped with a rod in communication with the drive. 14. The device according to claim 8, characterized in that the drive is made in interaction with the main rod and the flange rod by means of cams. 15. The device according to claim 8, characterized in that the ring is mounted on the flange using guide racks. 16. The device according to claim 8, characterized in that the annular frame is mounted on the frame using racks. 17. The device according to claim 8, characterized in that the forming head is equipped with a conical sleeve mounted on the stem of the clamping plate, angular sliders placed in the radial grooves of the pressure plate, angular sliders, covering and pressing the angular sliders to the conical surface of the conical sleeve, and a swinging arm mounted on the cantilever arm, which is in interaction with the cone clutch and is spring loaded with respect to the cantilever arm, the pressure plate nabzhena hooks to accommodate the inner struts of the respirator, and on one side of each comer of the slide groove configured to accommodate rubber cord obturator respirator.