JP2003340942A - Linearity keeping device, sheet material fusion device and heat-sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet material fusion device which reduces the width of a strip-like heat-sealing part. <P>SOLUTION: The sheet material fusion device 1 comprises a receiving seat 20 and a heating part 10 opposed to the receiving seat 20 arranged vertically above the receiving seat 20. The heating part 10 is formed of a first member 11 and a second member 12. The first member 11 is positioned on the receiving seat side and the second member 12 is positioned on the counter-receiving seat side and vertically above the first member 11. The first and the second member 11 and 12 are connected to each other and a main heater 13 is installed at the connection position. The first and the second member 11 and 12 are almost symmetrical centering around the main heater 13. The first member 11 has a cutting blade 11C for cutting the sheet material and providing a heat-sealing part, a first heating face 11D and a second heating face 11E, formed in one piece. An auxiliary heater 14 is provided within the first member 11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material fusing apparatus, and more particularly, when a pouch is manufactured, a heat seal portion is provided on the sheet material by stacking a plurality of sheet materials constituting the pouch and heating them. Substantially at the same time, the present invention relates to a sheet material fusing device that cuts a sheet material in the area of a heat seal portion.

[0002]

2. Description of the Related Art Conventionally, a sheet material fusing device has been used in the manufacturing process of resin pouches. The sheet material fusing device heats a plurality of stacked sheet materials to integrally provide a heat seal portion, and cuts the sheet material at the heat seal portion.

More specifically, the sheet fusing device is shown in FIG.
As shown in FIG. 5, the seat 120 is provided with a seat 120 on which the sheet is placed, and the sheet pressing portion 110 provided so as to face the seat 120. Sheet material pressing portion 1 of the seat 120
A first heating surface 120D and a second heating surface 120E each having a belt-like planar shape are provided at positions facing 10 respectively. The first heating surface 120D is flush with the second heating surface 120E and its longitudinal direction is parallel. The first heating surface 120D and the second heating surface 120E are spaced apart to define a space therebetween, and this space is a cutting blade insertion space into which a cutting blade 120C described later is inserted. Eggplant The seat 120 is made of a heat conductive material, and inside the portions of the seat 120 where the first heating surface 120D and the second heating surface 120E are provided, the first heating surface 120D and the second heating surface 120D, respectively. Rod-shaped heaters 130, 130 having substantially the same length as the heating surface 120E are provided parallel to the longitudinal direction of the first and second heating surfaces 120E.

The first heating surface 120D of the sheet material pressing portion,
At a position facing the second heating surface 120E, a first pressing surface 110A and a second pressing surface 110 each having a belt-like planar shape.
B and are provided. The first pressing surface 110A is flush with the second pressing surface 110B and its longitudinal direction is parallel. The first pressing surface 110A and the second pressing surface 110B are separated from each other to define a space therebetween, and this space forms a cutting blade moving space. A plate-shaped cutting blade 120C having a linear cutting edge 120F is provided in the cutting blade moving space, and the cutting edge 120F is parallel to the first and second pressing surfaces 110A and 110B. The cutting blade 120C moves in the cutting blade moving space in the direction of approaching the receiving seat 120 and is insertable into the cutting blade insertion space.

When the sheet material is provided with a heat seal portion and cut, first, a plurality of sheet materials (not shown) in a stacked state are placed on the first heating surface 120D and the second heating surface 120E. Placed. Next, the first and second heating surfaces 120
By sandwiching the sheet material between D, 120E and the first and second pressing surfaces 110B, the sheet material is made immovable with respect to the seat 120 and the sheet material pressing portion 110 of the seat 120, and the sheet material is cut by the cutting blade 120C. Then, the sheet material is heated by a heater. Through the above procedure, FIG.
As shown in FIG. 3, a band-shaped heat seal portion 31 is provided on a part of the sheet material forming the pouch 3, and the sheet material is cut.

[0006]

However, in the conventional sheet material fusing device, as described above, the first heating surface 12 is used.
In the cutting blade insertion space between 0D and the second heating surface 120E,
And, since the cutting blade 120C is moved in the cutting blade moving space between the first pressing surface 110A and the second pressing surface 110B, the sheet material is cut,
It was difficult to reduce the width of the band-shaped heat-sealed portion, and it was difficult to reduce the area of the heat-sealed portion. As a result, there has been a problem that the cost of the pouch cannot be reduced.

Further, the seat 12 of the conventional sheet fusing device
At 0, the second heating surface 1 on which the heater 130 is provided
Thermal expansion is large around 20E, while the heater 13
The thermal expansion is small at a position away from 0, that is, at a position below the second heating surface 120E in FIG. The difference in the thermal expansion may cause the second heating surface 120E to warp, which causes a problem of a decrease in the linearity of the second heating surface 120E. This problem is not limited to sheet material fusing equipment,
For example, a heat-sealing device or the like is common to all devices that have one member that may partially increase in temperature and that has a linear portion that requires high-accuracy linearity. Was occurring.

Therefore, the present invention has an object to provide a sheet material fusing device capable of reducing the width of a band-shaped heat-sealing portion, and linearity of a member such as a pedestal whose temperature partially rises. It is an object of the present invention to provide a linearity maintaining device, a sheet material fusing device, and a heat sealing device capable of maintaining the temperature.

[0009]

In order to achieve the above object, the present invention comprises a member having a linear portion, a part of the member constitutes a heated portion to be heated, and the member is a member to be heated. Provided is a linearity maintaining device which has a symmetrical shape with respect to the heating portion, and in which the material forming one side and the material forming the other side have the same thermal conductivity with respect to the center.

Further, the present invention comprises a member having a linear portion, a part of the member constitutes a heated portion to be heated, and the member is separated from the heated portion, and is more than the heated portion. In the low temperature position, the linearity maintaining device provided with the auxiliary heater is provided.

Further, according to the present invention, a heating portion for forming a belt-shaped heat-sealing portion in which a plurality of stacked resin sheet materials are heated in a belt shape to integrate the plurality of sheet materials. And a seat having a flat sheet material mounting surface on which the sheet material is mounted, and a seat facing the sheet material mounting surface, along the longitudinal direction of the heat seal portion in the area of the heat seal portion. In a sheet material fusing device having a cutting blade having a linear blade tip for cutting the sheet material, a first member facing the sheet material placement surface and made of a heat conductive material, and the same as the first member And a second member which is made of a heat conductive material and is connected to the side opposite to the seat of the first member,
The heating unit uses a main heater provided at a connecting portion between the first member and the second member as a heat source, and the first member and the second member are symmetrical with respect to the main heater. A surface of the first member facing the sheet material mounting surface forms a first heating surface and a second heating surface that are integral with the cutting blade, and the first heating surface has a belt-like planar shape, The second heating surface is in the form of a strip-shaped flat surface arranged parallel to and flush with the first heating surface,
The cutting blade is adjacent to the first heating surface and the second heating surface between the first heating surface and the second heating surface, and the longitudinal direction of the first heating surface and the second heating surface. The blade edges are provided in parallel to
The cutting edge projects in the direction of the sheet material mounting surface from the flat first and second heating surfaces, and the main heater has a substantially rod shape having a length substantially the same as that of the cutting blade. Provided is a sheet material fusing device arranged parallel to the longitudinal direction of a cutting blade.

Here, the first member is positioned vertically below the second member, and a position between the main heater and the cutting blade of the first member is parallel to the longitudinal direction of the cutting blade. It is preferable that a substantially rod-shaped auxiliary heater having a length substantially the same as that of the cutting blade is provided.

The seat is a seat first member having a sheet material mounting surface and made of a heat conductive material, and the seat first member made of the same heat conductive material as the seat first member. 1 member and a seat second member connected to the side opposite to the cutting blade, the sheet material mounting surface has a length substantially the same as the length of the cutting blade in the longitudinal direction, and the seat is , A seat main heater provided at a connecting portion between the seat first member and the seat second member is used as a heat source, and the seat first member and the seat second member are connected to the seat main heater. It is preferable that the main heater has a symmetrical shape, the main heater has a substantially rod shape having substantially the same length as the sheet material mounting surface, and is arranged parallel to the longitudinal direction of the sheet material mounting surface.

The seat first member is located vertically above the seat second member, and the seat second heater is located vertically below the seat main heater in the seat second member. It is preferable that a substantially rod-shaped seating auxiliary heater having substantially the same length as the seating main heater is provided in parallel.

Further, according to the present invention, a heating unit for forming a belt-shaped heat-sealing unit in which a plurality of stacked resin sheet materials are heated in a belt shape to integrate the plurality of sheet materials. And a seat having a flat sheet material mounting surface on which the sheet material is mounted, the sheet material mounting surface being provided to face the heating section, and the heating section and the sheet material. In a heat-sealing device in which the plurality of sheet materials are heat-sealed by sandwiching the sheet material with a mounting surface, a heat-conducting material that faces the sheet material mounting surface and constitutes the heating section is formed. One member and a second member made of the same heat conductive material as the first member and connected to the side opposite to the seat of the first member to form the heating unit, the heating unit including the first member. And a main heater provided at a connecting portion between the second member and the second member as a heat source, The one member and the second member are symmetrical with respect to the main heater, and a surface of the first member facing the sheet material mounting surface sandwiches the sheet material together with the sheet material mounting surface. A heat seal, which is a heating surface, the heating surface has a belt-like planar shape, the main heater has a substantially rod shape having substantially the same length as the heating surface, and is arranged parallel to the longitudinal direction of the heating surface. We provide equipment.

Here, the first member is positioned vertically below the second member, and a position between the main heater and the heating surface of the first member is parallel to the longitudinal direction of the heating surface. It is preferable that a substantially rod-shaped auxiliary heater having substantially the same length as that of the heating surface is provided on the.

Further, the seat is made of a heat conductive material and has a seat member first member having a sheet material mounting surface, and the seat first member is made of the same heat conductive material as the seat member first member. A seat second member connected to the non-heating surface side of the member, the sheet material mounting surface has a length substantially the same as the length of the heating surface in the longitudinal direction, the seat, A seat main heater provided at a connecting portion between the seat first member and the seat second member is used as a heat source, and the seat first member and the seat second member are mainly the seat main heater. It is preferable that the seat main heater has a substantially rod shape having substantially the same length as the sheet material mounting surface, and is arranged parallel to the longitudinal direction of the sheet material mounting surface.

The seat first member is located vertically above the seat second member, and the seat second heater is located vertically below the seat main heater in the seat second member. It is preferable that a substantially rod-shaped seating auxiliary heater having substantially the same length as the seating main heater is provided in parallel.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a linearity maintaining device according to the present invention is applied to a sheet material fusing device 1 is shown in FIG.
It will be explained based on. As shown in FIG. 1, the sheet material fusing apparatus 1 includes a heating unit 10 and a seat 20 facing the heating unit 10. The portion of the seat 20 facing the heating unit 10 forms a sheet material placement surface 21 in the form of a strip,
A plurality of sheet materials (not shown) are stacked on the sheet material mounting surface 21.

The heating unit 10 is arranged vertically above the receiving seat 20, has a first member 11 and a second member 12, and is constructed so as to be separable from and contacting the receiving seat 20. First member 1
1 is located on the seat side, that is, the side facing the seat 20, and the second member 12 is opposite to the counter seat side, that is, the side of the first member 11 that mainly faces the seat 20. Located on the side. Therefore, the second member 12 is located vertically above the first member 11. The first member 11 and the second member 12 are made of the same heat conductive material. First,
The second members 11 and 12 have substantially the same quadrangular prism shape, and one side surface of each of the second members 11 and 12 forms a flange-shaped flange surface 11A or 12A. The other side surfaces 11B, 12B facing the one side surface are shaped such that the corners at both ends are chamfered. The longitudinal direction of the first and second members 11 and 12 is parallel to the longitudinal direction of the sheet material mounting surface 21.

The flange surface 11A of the first member 11 and the flange surface 12A of the second member 12 are in contact with each other over the entire surface to be connected. Semi-cylindrical recesses 11a and 12a are formed at substantially central positions of the flange surface 11A of the first member 11 and the flange surface 12A of the second member 12, respectively. Second member 12
When it is connected to the flange surface 12A, the recess 11a and the recess 11b define a cylindrical space. The axial direction of the cylindrical space is the first and second
It is parallel to the longitudinal direction of the members 11, 12. In the cylindrical space, a main heater 13 having a substantially rod-shaped cross section and serving as a heat source of the heating unit 10 is provided. Main heater 13
Has an axial direction parallel to the longitudinal directions of the first and second members 11 and 12, and has a diameter slightly smaller than the diameter of the cylindrical space. The length of the main heater 13 is the first and second members 11, 1
It is substantially the same as the length in the longitudinal direction of 2. The first member 11 and the second member 12 are symmetrical with respect to the main heater 13. The positions of the first and second members 11 and 12 facing the main heater 13 correspond to the heated portion.

The sheet material mounting surface 2 on the first member 11
On the other side surface 11B facing the position 1, the cutting blade 1
1C, the 1st heating surface 11D, and the 2nd heating surface 11E are provided. The other side surface 12B of the second member 12 is a belt-shaped flat surface having the same width as the sheet material mounting surface 21.
The cutting blade 11C, the first heating surface 11D, and the second heating surface 11E form a part of the first member 11 and are integrally configured,
These can contact the sheet material mounting surface. The first heating surface 11D and the second heating surface 11E each have a strip-like planar shape, and the second heating surface 11E is flush with the first heating surface 11D. The longitudinal direction of the second heating surface 11E is parallel to the longitudinal direction of the first heating surface 11D. The length of the first heating surface 11D and the second heating surface 11E in the longitudinal direction is the first
It is the same as the length of the member 11 in the longitudinal direction. The cutting blade 11C corresponds to a linear portion.

The cutting blade 11C is in the shape of an elongated triangular prism, and one side forming the side surface forms the cutting edge 11F. The cutting blade 11C is provided between the first heating surface 11D and the second heating surface 11E, and the first heating surface 11D and the second heating surface 1 are provided.
It is adjacent to 1E. The longitudinal direction of the cutting blade 11C is parallel to the longitudinal directions of the first and second heating surfaces 11E, and the length in the longitudinal direction is the same as the length of the first member 11. The cutting blade 11C is in a state of protruding in the direction of the sheet material mounting surface 21 rather than the first and second heating surfaces 11D and 11E. First heating surface 11D, cutting blade 11C, and second heating surface 11E
The total length in the width direction of the sheet material is the same as the length in the width direction of the sheet material mounting surface 21 facing them, and the sheet material mounting surface 21 and the first heating surface 11D and the second heating surface 11E It is configured so that a plurality of stacked sheet materials can be stably sandwiched.

Since the cutting blade 11C, the first heating surface 11D, and the second heating surface 11E are integrally provided, the sheet material is cut by being sandwiched between the sheet material mounting surface 21 and the cutting edge 11F of the cutting blade 11C. The heat seal portion is provided by being sandwiched between the first heating surface 11D, the second heating surface 11E and the sheet material mounting surface 21. The first heating surface 11D,
By making the width direction of the second heating surface 11E as short as possible, the length of the heat seal portion in the width direction can be shortened and the area of the heat seal portion can be reduced.

Further, the first member 11 and the second member 12 are made of the same heat conductive material, and the first member 11 and the second member 1
2 has a symmetrical shape with respect to the main heater 13, the temperature distribution of the first member 11 and the temperature distribution of the second member 12 are the first and the second at the position where the main heater 13 is provided. 2 members 11, 12 flange surfaces 11A, 1
The shape can be symmetrical with respect to 2A. As a result,
It is possible to prevent the warp from occurring in the longitudinal direction of the heating unit 10, and to prevent the warp of the cutting blade 11C provided on the first member 11 constituting the heating unit 10 from occurring. By making the temperature distribution symmetrical, the first member 11
The theory that can prevent the heating portion 10 including the second member 12 and the second member 12 from warping will be described later. The second member 1
2 is slightly different from the other side surface 11B of the first member 11 in that the cutting blade 11C is not provided on the other side surface 12B, but the volume of the cutting blade 11C is the same as that of the first and second members 11 and 12. However, since it is extremely small, there is no problem in considering that the first member 11 and the second member 12 are symmetrical with respect to the main heater 13.

Inside the first member 11, the main heater 13
A cylindrical auxiliary heater insertion space 11b is formed at a position approximately in the middle between the cutting blade 11C and the cutting blade 11C. The length direction of the auxiliary heater insertion space 11b is parallel to the length direction of the cutting blade 11C, and the length in the length direction is substantially the same as the length of the cutting blade 11C. The diameter of the auxiliary heater insertion space 11b is smaller than the diameter of the space in which the main heater 13 is provided. An auxiliary heater 14 is provided in the auxiliary heater insertion space 11b. The auxiliary heater 14 has a substantially rod shape with a circular cross section having a length substantially the same as that of the cutting blade 11C, the longitudinal direction thereof is parallel to the longitudinal direction of the cutting blade 11C, and the diameter of the auxiliary heater insertion space 11b. It is slightly smaller than the diameter.

Cutting blade 11C of the first member 11, first, second
The heating surfaces 11D and 11E decrease in temperature when approaching and abutting a sheet material having a low temperature. Further, since the first member 11 is located vertically below the second member 12,
Due to the natural convection temperature effect, the temperature of the first member 11 becomes lower than the temperature of the second member 12. However, the auxiliary heater 14
Is provided, it is possible to partially heat the first member 11, and it is possible to prevent the temperature of the first member 11 from becoming lower than the temperature of the second member 12. Therefore, the temperature distribution of the first member 11 and the second member 12
The temperature distribution can be made to have an ideal symmetrical shape with the main heater 13 as the center, and it is possible to highly accurately prevent warpage in the longitudinal direction of the heating unit 10.

When cutting the sheet material and providing the heat-sealing portion, first, a plurality of sheet materials (not shown) in a stacked state are placed on the sheet material placement surface 21. Next, by sandwiching the sheet material by the cutting blade 11C and the first and second heating surfaces 11D and 11E and the sheet material mounting surface 21, the sheet material is cut by the cutting blade 11C, and the first and second A heat seal portion is provided by the heating surfaces 11D and 11E.

The temperature distribution in the heating section 10 is shown by the main heater 1
By making the shape symmetrical about 3
Theoretical proof that the warp of the heating unit 10 configured by the first and second members 12 can be prevented is as follows. First, as shown in FIG. 2, the radius of curvature of rebound when a plate member having a substantially rectangular parallelepiped shape with a constant thickness rebounds due to the internal temperature distribution will be considered. The origin O is set at a position midway between the upper surface and the bottom surface of the plate member shown in FIG. 2, that is, at a position half the thickness of the member, and the x axis and the y axis are set on a virtual plane parallel to the upper surface and the bottom surface. And z in the direction perpendicular to the bottom
Take an axis. The coefficient of thermal expansion is α, the radius of curvature of the rebound of the joining member at the position of z = 0 is R, the thickness of the plate material is 2 h, and the temperature distribution inside the plate material represented by the function of the variable z is T (z), If the temperature difference in the x and y directions is 0, it is known that there is the following relationship between them.

From the equation (1), 1 / R should be 0 when the temperature distribution T (z) is symmetrical with respect to an imaginary plane including the origin O and parallel to the top and bottom surfaces. I understand.

Next, as shown in FIG. 3, the radius of curvature of the recoil when a laminated plate formed by joining two plate members each having a substantially rectangular parallelepiped shape with a constant thickness is reciprocated due to the internal temperature distribution. think about. The thickness of the upper plate is h ₁ , the thermal expansion coefficient is α ₁ , the elastic modulus is E ₁ , the thickness of the lower plate is h ₂ , the thermal expansion coefficient is α ₂ , the elastic modulus is E ₂ , and the whole laminated plate is used. The temperature rise of T ₁ −T ₀ , h = h ₁ + h ₂ , m = E
It is known that there is the following relationship, where ρ is the radius of curvature at the joint surface of the _two plate materials, ₁ / E ₂ = 1.

Next, the thermal stress of the elastic body will be considered. The surface stress changes with time, and the smaller the Biot's coefficient, the smaller and constant the stress. Here, if the thickness of the plate material is 2 h, the heat transfer coefficient of the plate surface is μ, and the thermal conductivity of the plate material is k, the Biot coefficient β is Is.

From the above, it can be seen that a material having a small coefficient of thermal expansion α should be selected in order to make the thermal strain of the plate material extremely small. Furthermore, the temperature distribution T (z ) Needs to be small. For this purpose, it is understood from the above equation (1) that the temperature distribution needs to be symmetrical with respect to the central position in the vertical direction of the plate material. Further, it can be seen that the thermal strain of the plate material can be minimized by increasing the value of the plate material thickness 2h, increasing the value of the thermal conductivity k, and decreasing the value of the heat transfer coefficient μ. . Further, in the laminated plate, if the upper plate member and the lower plate member are made of the same material and have the same shape, α ₂ −α ₁ = 0 in the above formula (2), and theoretically 1 /
It can be seen that ρ = 0.

Considering the ideal shape of the heating unit 10 of the sheet material fusing apparatus 1 according to the present embodiment based on the above theory, the first member 11 and the second member 12 are joined to each other. By making the main heater 13 provided on the joined surface symmetrical, the rebound occurs so that the radius of curvature becomes symmetrical, and the stress also becomes symmetrical, and the curvature of the entire heating unit 10 becomes The radius is the smallest. Further, it is understood that the strain of the entire heating unit 10 can be minimized by minimizing the error of the thermal expansion coefficient α and the temperature distribution T (z).

Further, in a so-called sealing machine which is equipped with a heating device and performs a heat sheet, the heating temperature differs depending on the quality, thickness and sealing time (rotational speed of the machine) of the sealing material. Every time the quality of
It is necessary to reset to an appropriate heating temperature. As the heating temperature is reset, adjustment of the device is also necessary each time. However, in the configuration of the heating unit 10 according to the present embodiment, the stress at each temperature is the first member 11 and the second member 12.
Both are the same, and adjustments and the like can be eliminated.

The sheet material fusing apparatus according to the present invention is not limited to the above-mentioned embodiment, and various modifications and improvements can be made within the scope of the claims. For example, the pouch produced by fusing by the sheet fusing device according to the present invention is not limited to the type shown in FIG. For example,
It may be a so-called joint type, a gusset type (four corners) type, a three-sided seal type, a standing type, a barracuda type, or the like. Moreover, what is formed by the sheet material that is cut by fusing may not be a pouch.

The shapes of the main heater, the auxiliary heater, the first member and the second member are not limited to the shapes of this embodiment. It suffices that the temperature distribution in the heating section is symmetrical with respect to the main heater.

Further, in the present embodiment, the linearity maintaining device is applied to the sheet material fusing apparatus 1, but it may be applied to an apparatus other than the sheet material fusing apparatus. For example, the present invention can be applied to a heat-sealing device that performs only heat-sealing without cutting a sheet material or a device that performs extrusion laminating. Here, the heat seal device may be any type such as an impulse type, a high frequency type, and a room temperature type. Also, such as measuring instruments, spirit levels, stretches, machine tools, etc., have linear parts that require high linearity with high accuracy. The present invention can be applied to a device in which the linearity of the profile is required to be maintained.

When the linearity maintaining device is applied to a heat sealing device, the sheet material fusing device according to the present embodiment may be configured such that the first member 11 is not provided with the cutting blade 11C. That is, in the first member 11,
The first heating surface 11D and the second heating surface 11E may be flush with each other and may be a flat surface that is continuous, and this portion may be a flat surface having the same shape as the sheet material mounting surface 21. . The other parts are the same as the sheet fusing device. Heat sealing is performed by sandwiching the sheet material between the flat surface and the sheet material mounting surface.

Further, in the present embodiment, the heating section 10 is symmetrical with respect to the main heater 13, but the main heater is also provided in the seat so that the seat is provided with the main heater in the same manner as the heating section 10. The shape may be symmetrical with respect to the center in the vertical direction. Also in this case, similarly to the heating unit 10, the material constituting one side located vertically below the main heater and the material constituting the other side located vertically above have the same thermal conductivity. Have sex. Further, an auxiliary heater may be provided on one side. Also, when the linearity maintaining device is applied to the heat seal device as described above,
Similarly, the seat may be provided with a main heater so that the seat has a symmetrical shape in the vertical direction with respect to the main heater. Also in this case, similarly to the heating unit 10, the material constituting one side located vertically below the main heater and the material constituting the other side located vertically above have the same thermal conductivity. Have sex. Further, an auxiliary heater may be provided on one side.

[0041]

According to the linearity maintaining device of the first aspect, the member having the linear portion has a symmetrical shape with respect to the heated portion as a center, and the material constituting one side with respect to the center and the other material. Since the material forming the side has the same thermal conductivity, the temperature distribution in the member can be symmetrical about the heated portion, and the temperature gradient can be zero. Therefore, it is possible to reduce the thermal strain of the member to 0, and it is possible to prevent the warp from occurring in the longitudinal direction of the linear portion.

According to the linearity maintaining device of the second aspect,
Since the auxiliary heater is provided at a position where the temperature of the member having the linear portion is lower than that of the heated portion, the temperature distribution of the member can be symmetrical about the heated portion. The slope can be zero. Therefore, it is possible to reduce the thermal strain of the member to 0, and it is possible to prevent the warp from occurring in the longitudinal direction of the linear portion.

According to the sheet material fusing apparatus of the third aspect, the heating portion is located at a position facing the sheet material mounting surface of the first member, and has the first heating surface and the second heating surface which are integral with the cutting blade. Therefore, the length in the width direction of the heat seal portion provided on the sheet material can be made as small as possible by shortening the width direction of the first heating surface and the second heating surface as much as possible. The area of can be minimized. Therefore, it is possible to reduce the price of the pouch made of the sheet material.

Further, the main heater is provided at the connecting portion between the first member and the second member, and the first member and the second member are symmetrical with respect to the main heater. The temperature distribution in the heating section composed of two members can be made symmetrical with respect to the main heater, and it is possible to prevent the recoil in the longitudinal direction of the heating section.

According to the sheet material fusing device of the fourth aspect, the first member is positioned vertically below the second member, and the cutting blade is provided at a position between the main heater and the cutting blade of the first member. Since a substantially rod-shaped auxiliary heater having a length substantially the same as the cutting blade is provided parallel to the longitudinal direction, the cutting blade of the first member,
The natural convection temperature effect is caused by the fact that the first and second heating surfaces are brought into contact with the sheet material to lower the temperature, and the first member is positioned vertically below the second member. Thus, even when the temperature of the first member becomes lower than the temperature of the second member, the first member can be partially heated. Therefore, the temperature distribution of the first member and the second
It is possible to make the temperature distribution of the member have an ideal symmetrical shape with the main heater as the center, and it is possible to highly accurately prevent warpage in the longitudinal direction of the heating portion.

According to the sheet material fusing apparatus of the fifth aspect, since the seat first member and the seat second member are symmetrical with respect to the seat main heater, the seat first member The temperature distribution inside the seat formed of the seat second member can be made symmetrical with respect to the main heater, and it is possible to prevent the recoil in the longitudinal direction of the seat.

According to the sheet material fusing device of the sixth aspect, at the position of the seat second member vertically below the seat main heater, a length substantially the same as the seat main heater is provided in parallel with the seat main heater. Since the substantially rod-shaped seating auxiliary heater is provided, since the second member is positioned vertically below the first member, the temperature of the second member is reduced due to the natural convection temperature effect. Even when the temperature becomes lower than the temperature of the first member, the second member can be partially heated. Therefore, the temperature distribution of the second member and the temperature distribution of the first member can be made to have an ideal symmetrical shape with the main heater as the center, and it is possible to highly accurately prevent warpage in the longitudinal direction of the seat. Can be prevented.

According to the heat sheet apparatus of the seventh aspect, since the first member and the second member have symmetrical shapes with respect to the main heater, the temperature in the heating section composed of the first member and the second member is increased. It is possible to make the distribution symmetrical with respect to the main heater, and it is possible to prevent warping in the longitudinal direction of the heating portion.

According to the heat sheet device of the eighth aspect, the first member is located vertically below the second member, and the longitudinal direction of the heating surface is between the main heater and the heating surface of the first member. Since a substantially rod-shaped auxiliary heater having a length substantially the same as the heating surface is provided parallel to the direction, the heating surface abuts the sheet material to lower the temperature, and the first member has the second member. Even if the temperature of the first member becomes lower than the temperature of the second member due to the natural convection temperature effect due to being located vertically below the member, the first member is It can be partially heated. Therefore, the temperature distribution of the first member and the temperature distribution of the second member can be made to have an ideal symmetrical shape with the main heater as the center, and it is possible to highly accurately prevent warpage in the longitudinal direction of the heating portion. Can be prevented.

According to the heat seat apparatus of the ninth aspect, since the seat first member and the seat second member are symmetrical with respect to the seat main heater, the seat first member and the seat first member are symmetrical. The temperature distribution in the seat formed by the seat second member can be made symmetrical with respect to the main heater, and it is possible to prevent the recoil in the longitudinal direction of the seat.

According to the heat seat device of the tenth aspect, the seat first member is positioned vertically above the seat second member,
Since a substantially rod-shaped seat auxiliary heater having a length substantially the same as that of the seat main heater is provided in a position vertically below the seat main heater of the seat second member, Due to the fact that the two members are located vertically below the first member, the
Even when the temperature of the member is lower than the temperature of the first member, the second member can be partially heated. Therefore, the temperature distribution of the second member and the temperature distribution of the first member can be made to have an ideal symmetrical shape with the main heater as the center, and it is possible to highly accurately prevent warpage in the longitudinal direction of the seat. Can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a sheet material fusing device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a plate material for explaining theoretical backing for determining the shape of the heating unit according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a laminated plate for explaining theoretical support for determining the shape of a heating unit according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing a conventional sheet material fusing device.

FIG. 5 is a conceptual diagram showing a state in which a sheet material is fused and turned into a pouch by a conventional sheet material fusing device.

[Explanation of symbols] 1 Sheet material fusing device 10 heating unit 11 First member 11C cutting blade 11F cutting edge 12 Second member 13 Main heater 14 Auxiliary heater 20 seat 21 Sheet material mounting surface 31 Heat seal part

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65B 51/24 B65B 51/24 AF term (reference) 3C060 AA20 CF02 3E075 AA04 BA42 BA46 BA70 CA02 CA05 DA32 DB03 DB14 DD14 DD32 DD42 FA04 FA06 GA02 GA04 3E094 AA12 CA12 FA13 HA08 HA20

Claims (10)

[Claims] 1. A member having a linear portion, wherein a part of the member is a heated portion to be heated, the member has a symmetrical shape with respect to the heated portion, and is one with respect to the center. The linearity maintaining device characterized in that the material forming the side of and the material forming the other side have the same thermal conductivity. 2. A member having a linear portion, a part of the member constitutes a heated portion to be heated, and a position of the member spaced from the heated portion and having a temperature lower than that of the heated portion. The linearity maintaining device is characterized in that an auxiliary heater is provided in the. 3. A heating unit for forming a band-shaped heat-sealing unit in which a plurality of stacked resin sheet members are heated in a band shape to integrate the plurality of sheet members, and the sheet. A seat having a flat sheet material mounting surface on which a material is mounted, and a sheet material facing the sheet material mounting surface and extending in the longitudinal direction of the heat seal portion in the area of the heat seal portion. In a sheet material fusing device having a cutting blade having a linear blade tip for cutting a sheet, a first member facing the sheet material mounting surface and made of a heat conductive material, and the same heat conductivity as the first member. A second member made of a material and connected to a side opposite to the seat of the first member, wherein the heating section uses a main heater provided at a connection section between the first member and the second member as a heat source. , The first member and the second member are centered around the main heater And a surface facing the sheet material mounting surface of the first member forms a first heating surface and a second heating surface that are integral with the cutting blade, and the first heating surface has a strip shape. The second heating surface has a strip-shaped planar shape arranged parallel to and flush with the first heating surface, and the cutting blade has the first heating surface and the second heating surface. Adjacent to the first heating surface and the second heating surface between and and the cutting edge is provided in parallel to the longitudinal direction of the first heating surface and the second heating surface,
The cutting edge projects in the direction of the sheet material mounting surface from the flat first and second heating surfaces, and the main heater has a substantially rod shape having a length substantially the same as that of the cutting blade. A sheet material fusing device, which is arranged parallel to a longitudinal direction of a cutting blade. 4. The first member is positioned vertically below the second member, and the first member is positioned between the main heater and the cutting blade in a direction parallel to the longitudinal direction of the cutting blade. The sheet material fusing apparatus according to claim 3, further comprising a substantially rod-shaped auxiliary heater having a length substantially the same as that of the cutting blade. 5. The seat is a seat first member having a sheet material mounting surface and made of a heat conductive material, and a seat first member made of the same heat conductive material as the seat first member. 1 member and a seat second member connected to the side opposite to the cutting blade, the sheet material mounting surface has a length substantially the same as the length of the cutting blade in the longitudinal direction, and the seat is , A seat main heater provided at a connecting portion between the seat first member and the seat second member is used as a heat source, and the seat first member and the seat second member are the seat main heater. It is characterized in that it has a symmetrical shape as a center, the main heater has a substantially rod-like shape having substantially the same length as the sheet material mounting surface, and is arranged parallel to the longitudinal direction of the sheet material mounting surface. The sheet material fusing device according to claim 3. 6. The seat first member is located vertically above the seat second member, and the seat main heater is located vertically below the seat main heater of the seat second member. 7. The sheet material fusing apparatus according to claim 3, wherein a substantially rod-shaped seating auxiliary heater having a length substantially the same as that of the seating main heater is provided in parallel. 7. A heating unit for forming a band-shaped heat-sealing unit in which a plurality of stacked resin sheet members are heated in a band shape to integrate the plurality of sheet members, and the sheet. A seat having a flat sheet material mounting surface on which a material is placed, the sheet material mounting surface is provided to face the heating section, and the heating section and the sheet material mounting surface are provided. In a heat-sealing device in which the plurality of sheet materials are heat-sealed by sandwiching the sheet materials with each other, a first member that faces the sheet material mounting surface and is made of a heat conductive material and that constitutes the heating unit, A second member made of the same heat conductive material as the first member and connected to the side opposite to the seat of the first member to form the heating unit, wherein the heating unit includes the first member and the second member. The main heater provided in the connection portion with the member is used as a heat source, and the first member and the The second member has a symmetrical shape with respect to the main heater, and a surface of the first member facing the sheet material mounting surface forms a heating surface that sandwiches the sheet material with the sheet material mounting surface. The heating surface has a belt-like planar shape, the main heater has a substantially rod-like shape having substantially the same length as the heating surface, and is arranged parallel to the longitudinal direction of the heating surface. Sealing device. 8. The first member is positioned vertically below the second member, and is located at a position between the main heater and the heating surface of the first member in parallel to the longitudinal direction of the heating surface. The heat-sealing device according to claim 7, further comprising a substantially rod-shaped auxiliary heater having a length substantially the same as that of the heating surface. 9. The seat is a first seat member made of a heat conductive material and having a sheet material mounting surface, and a first heat conductive material made of the same heat conductive material as the first seat member. A seat second member connected to the side opposite to the heating surface of the member, wherein the sheet material mounting surface has a length substantially the same as the length of the heating surface in the longitudinal direction, and the seat is A seat main heater provided at a connection portion between the seat first member and the seat second member is used as a heat source, and the seat first member and the seat second member are mainly the seat main heater. And the seat main heater has a substantially rod shape having substantially the same length as the sheet material mounting surface, and is arranged parallel to the longitudinal direction of the sheet material mounting surface. The heat seal device according to claim 7. 10. The seat first member is positioned vertically above the seat second member, and the seat main heater is provided at a position of the seat second member vertically below the seat main heater. 10. The heat-sealing device according to claim 7, further comprising a substantially rod-shaped seating auxiliary heater having a length substantially the same as that of the seating main heater.