JPH0659654B2 - Continuous vulcanization equipment for unvulcanized rubber extruded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention continuously foams and vulcanizes an unvulcanized rubber extruded product extruded from an extruder using microwave energy and hot air energy. In particular, the present invention relates to an apparatus for producing a foam rubber having a shape having a homogeneous foam state.

"Prior art" Conventionally, when an unvulcanized rubber extruded product is continuously foamed and vulcanized to produce foam rubber (hereinafter referred to as "sponge rubber"), it is extruded from an extruder. In the foaming and vulcanizing step of the heated rubber, a device for continuously and uniformly heating using microwave and hot air energy is generally used.

Also, a vulcanized molded product of the heated rubber extruded from the extruder (hereinafter referred to as "solid rubber") is manufactured by the same apparatus as above.

FIG. 7 is a typical configuration diagram of a continuous vulcanizing apparatus (hereinafter referred to as “vulcanizing apparatus”) for this type of unvulcanized rubber extruded product.

The vulcanizer 50 is an extruder 11 and a microwave heating furnace 5.
The secondary heating furnace 48 and the continuous take-up machine 16 are provided.

The raw material charged through the supply port 17 of the extrusion molding machine 11 is transferred to the molding die 21 by the screw 20 which is rotationally driven by the motor 19 in the cylinder 18.

Subsequently, the elongated unvulcanized rubber extruded product 22 (hereinafter referred to as “extruded rubber 22”) extruded from the molding die 21 is transferred by each belt conveyor 49 of the microwave heating furnace 51 and the secondary heating furnace 48. The continuous take-up machine 16 picks it up.

During the above process, the extruded rubber 22 is heated in the microwave heating furnace 51.
The microwave energy generated by the microwave oscillator 24 and the hot air energy generated by the hot air generator including the heater 27 and the blower 28 are received therein to rapidly raise the temperature to an appropriate vulcanization temperature. Furthermore, in the secondary heating furnace 48, the vulcanization reaction is completed while the extruded rubber 22 receives the hot air energy from the hot air generator to maintain the vulcanization temperature.

The belt conveyor 49 provided in the microwave heating furnace 51 and the secondary heating furnace 48 both have the same configuration, and are adjusted to an arbitrary speed by the rotation control of the motor 36, and these are adjusted according to the extrusion speed of the extruder 11. It is adjusted to have the same transport speed.

By the way, when the extruded rubber 22 is a solid rubber, only the vulcanization reaction is performed. Therefore, both belt conveyors 49 may be synchronized with the extrusion speed at the time of extrusion molding as described above. When producing sponge rubber as a product, since a foaming reaction occurs in addition to the vulcanization reaction,
The extruded rubber 22 expands due to expansion, and as a result, there is a problem that the shape of the sponge rubber produced will be deformed if the belt conveyors 49 are set to the same speed as described above.

In order to solve this problem, in the case of actually producing sponge rubber, the belt conveyor 49 of the secondary heating furnace arranged after the microwave heating furnace is divided into several belts arranged in the conveying direction and decomposed. As a constitution in which the basicity of each of the conveyors is sequentially increased in the conveying direction, the conveyer is conveyed with the expansion due to the expansion of the foaming reaction so that the shape of the sponge rubber produced is kept uniform.

[Problems to be Solved by the Invention] As described above, in the vulcanizing apparatus 50, the extruder 11 is used.
The extruded rubber 22 having more extruded heat is not directly carried into the microwave heating furnace and heated, but is carried into the microwave heating furnace via a conveyor mechanism such as a belt conveyor, so that sponge rubber is used. There are the following three problems in manufacturing the.

The first problem is that the portion of the extruded rubber 22 that is in contact with the belt conveyor 49 causes a temperature drop due to the belt conveyor 49.

In the portion of the extruded rubber 22 that comes into contact with the belt conveyor 49, hot air generated by the hot air generator is conveyed to the belt conveyor 49.
Is blocked by the belt conveyor 49 and does not work effectively, and since the belt conveyor 49 once exits the outside and enters the microwave heating furnace, the extruded rubber 22 is delivered at about room temperature, and heat is taken from the extruded rubber 22. To cause.

In addition, dielectric materials such as rubber and plastic tend to increase high-frequency loss with increasing temperature, and because microwaves have the property of being selectively absorbed by the ones with higher high-frequency loss, microwave heating Previously extruded rubber 22
If there is a temperature difference between the two, uneven heating will increase more and more during microwave heating, and even if heating is performed in a uniform microwave electric field, uneven heating cannot be avoided.

Generally, in the microwave heating furnace 51, 150 to 300 ° C.
The heating of the extruded rubber 22 is made uniform by using such hot air as well as preheating the extruded rubber portion which becomes the contact surface of the belt conveyor 49 with the energy of near infrared rays immediately before entering the microwave heating furnace 51. However, the portion of the extruded rubber 22 with which the belt conveyor 49 comes into contact does not move with respect to the conveyor, but remains in the same place, and vulcanization and foaming proceed, so that it was not possible to eliminate uneven heating due to this effect. This phenomenon is particularly noticeable when producing a highly foamed spigot rubber. For example, as shown in FIG. 8 (a), even when the extruded rubber 22 is extruded into a hose-shaped tube having a uniform wall thickness, As shown in FIG. 8 (b), the thickness is largely uneven. This phenomenon occurs due to the difference in foaming ratio even at a temperature difference of several degrees at the belt contact portion, and it is difficult to produce a good sponge rubber product because it is not linear but is greatly curved (camber) in the length direction. .

The second problem is the deformation of the sponge rubber product caused by the frictional resistance with the belt conveyor 49 when the extruded rubber 22 expands and expands in the cross-sectional direction (radial direction) by the foaming reaction.

The extruded rubber 22 is heated in the microwave heating furnace 51 by receiving microwaves and hot air energy. At this time, the foaming agent mixed in the raw material starts to decompose, gas is generated and starts to progress to the foamed body, and in the secondary heating furnace 48, a sponge-like extruded body is formed.

However, since the portion of the extruded rubber 22 that is in contact with the belt conveyor 49 has frictional resistance, this rubber 22
Cannot slide smoothly, for example, extruder 1
Even if the extruded rubber 22 having an accurate rectangular cross section as shown in FIG. 9 (a) is extruded from No. 1, it is transformed into a fan-shaped cross section as shown in FIG. 9 (b).

This is because the part where the expansion is free due to the foaming reaction becomes the normal foaming, but the part where the frictional resistance is applied suppresses the expansion. Specifically, points L and R on FIG. 9, that is,
Since slippage is suppressed where the belt conveyor 49 hits the left and right sides, the central portion c is extended upward and the cross-sectional shape is curved as shown in the figure.

This phenomenon naturally varies depending on the compounding of the rubber raw material, and is more remarkable when the rubber has a lower rubber viscosity. Currently, in order to prevent this deformation by reducing this slip resistance as much as possible,
Calcium carbonate powder is added, but it is not preferable from the viewpoint of working environment due to dust, and it cannot be said that it is a sufficient countermeasure.

The third problem is the deformation caused by the elongation of the extruded rubber 22 in the length direction.

This elongation is greater than the above-mentioned elongation in the cross-sectional direction, and in order to prevent deformation due to this elongation, the belt conveyor 4
The point is how the extruded rubber 22 foamed on the sheet 9 is conveyed without meandering.

Therefore, as in the case of producing solid rubber, the meandering belt conveyor 49 of each heating furnace cannot prevent the meandering, so as already mentioned, it is disassembled into several belt conveyors and each conveyor is The above-mentioned meandering is prevented by gradually increasing the speed to convey the extruded rubber 22 to the tension. The number of divisions of the belt conveyor is extruded rubber 2
Although it depends on the foaming ratio of 2, it is generally about 3 to 6 divisions.

However, in order to produce a stable and good spigot rubber, a high level of skill is required to adjust the speed of each belt conveyor 49 and the take-off machine 16, temperature conditions, and the like, and in terms of yield and deformation due to the weight of the rubber itself. Since there is a limit to the shape of the vulcanizer, there are many problems with the current equipment of vulcanization equipment.

Therefore, an object of the present invention is to solve the above-mentioned problems and to develop a vulcanizing apparatus capable of stably producing sponge rubber with a uniform shape.

"Means for Solving the Problems" The present invention is to solve the above problems, and as a first invention,
In an apparatus for continuously vulcanizing and foaming unvulcanized rubber extruded products by microwave irradiation and hot air, a large number of devices for conveying unvulcanized rubber extruded products in a microwave heating furnace and a secondary heating furnace are used. The transport rollers are sequentially arranged at predetermined intervals along the transport direction, and a sprocket, which is rotatably driven in series by a chain or a toothed belt driven by a motor in each heating furnace, is axially supported on each of the transport rollers. The unvulcanized rubber extruded product is characterized in that the unrolled rubber extruded product is configured to change the rotation speed by changing the number of teeth of the sprocket of the carrying roller located in the carrying path portion where it is deformed by the foaming reaction. We propose a continuous vulcanization system.

As a second invention, in an apparatus for continuously vulcanizing and foaming an unvulcanized rubber extruded product by irradiation of microwaves and hot air, extrusion molding of unvulcanized rubber in a microwave heating furnace and a secondary heating furnace. A large number of transport rollers for transporting the product are sequentially arranged at predetermined intervals along the transport direction, and the roller diameter of the transport roller located in the transport path where the unvulcanized rubber extruded product is deformed by the foaming reaction is changed. The present invention proposes a continuous vulcanization apparatus for unvulcanized rubber extruded products, characterized in that a large number of conveying rollers are driven at the same number of revolutions.

As a third invention, in an apparatus for continuously vulcanizing and foaming an unvulcanized rubber extruded product by irradiation of microwaves and hot air, extrusion of unvulcanized rubber into a microwave heating furnace and a secondary heating furnace. A large number of conveying rollers for conveying molded products are sequentially arranged at predetermined intervals along the conveying direction, and the unvulcanized rubber extruded products are arranged in a certain range where expansion due to the foaming reaction is large. Continuous vulcanization of an unvulcanized rubber extruded product, characterized in that rollers are sequentially arranged lower along the conveying direction and the conveying path of the unvulcanized rubber extruded product is inclined at a predetermined angle from the horizontal plane. Suggest a device.

"Working" The unvulcanized rubber extruded product extruded from the extruder is transferred by the conveyor rollers in the heating chamber of the microwave heating furnace and the secondary heating furnace, during which vulcanization reaction is caused by microwave energy and hot air energy. And a foaming reaction is carried out.

Then, the conveying roller in the conveying furnace where the foaming reaction occurs changes the rotation speed according to the number of teeth of the sprocket, and
Since the peripheral speed is changed according to the diameter of the sprocket, the unvulcanized rubber extruded product is conveyed according to the elongation due to the foaming reaction, and a product having a uniform shape is obtained. In the above process, since the extruded unvulcanized rubber extruded product is successively transferred and conveyed on the surface of the rotating conveying roller, the time in contact with each conveying roller is instantaneous, and the conveying roller of the preceding stage is also present. The expansion due to foaming becomes free during transfer from the next transfer roller to the transfer roller.

From this, the expansion is averaged in the cross-sectional direction of the unvulcanized rubber extruded product.

In addition, since the unvulcanized rubber extruded product does not come into contact with the rollers between the transport rollers, heat is not taken away by the transport mechanism in both microwave heating and hot air heating, which causes uneven heating. In addition, since each conveying roller is in the heating furnace, the temperature is raised to the atmospheric temperature of the hot air, and the conveying rollers tend to apply heat to the unvulcanized rubber extruded product. As a result, uneven foaming caused by uneven heating does not occur, and the produced sponge rubber has no variation in shape.

Further, if each conveying roller at the portion where the expansion due to the foaming reaction is the largest is gradually lowered from the horizontal plane along the conveying direction within the range of, for example, 15 to 45 degrees, an unvulcanized rubber extruded product can be obtained. The influence of its own weight is reduced and the expansion in the length direction due to the foaming reaction becomes uniform, and the entire unvulcanized rubber extruded product expands linearly without meandering.

[Examples] Next, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a vulcanizing apparatus showing the first embodiment.

The main vulcanizer 10 is an extrusion molding machine 11 and a microwave heating furnace 1.
2, NO. 1 secondary heating furnace 13, NO. 2 Secondary heating furnace 1
4, NO. It is composed of 3 secondary heating furnaces 15 and a continuous take-up machine 16.

In the above structure, the extrusion molding machine 11 and the continuous take-up machine 16 have the same structure as that of the conventional example shown in FIG.
Similarly, the microwave oscillator 24 of the microwave heating furnace 12,
NN. 1-NO. The hot air generator of the secondary heating furnace of No. 3 has the same configuration as that used in the microwave heating furnace 51 and the secondary heating furnace 48 shown in the conventional example.

Therefore, the parts having the same configurations as those shown in the conventional example are designated by the same reference numerals, and the parts already described in the conventional example are omitted.

2 is a front view of the microwave heating furnace 12, and FIG. 3 is a second view.
It is the simplified sectional drawing cut | disconnected along the AA line on a figure.

As shown in this figure, the microwave heating furnace 12 is composed of a microwave oscillator 24, a waveguide 25, a heating chamber 26, a hot air generator including a heater 27 and a blower 28, a transport roller driving mechanism 29, and the like.

The microwave oscillator 24 is separately provided and irradiates microwave energy from above into the heating chamber 26 through the waveguide 29.

The heating chamber 26 is a tunnel-shaped chamber that penetrates from the left side surface to the right side surface in FIG. 2, and portions near the left and right side surfaces form an inlet 26a and an outlet 26b that are narrow spaces to prevent waveguide leakage to the outside. However, the entire circumference of the heating chamber 26 is surrounded by a heat insulating wall 30 formed by a heat insulating member.

Further, a tip end 25a of a waveguide 25 for irradiating microwave energy is connected to the center of the ceiling of the heating chamber 26, and two hot air outlets 31a communicating with the hot air passage 31 are provided on the bottom surface of the heating chamber 26. , 31b are provided.

Furthermore, the heating chamber 26 has a door 32 for maintenance and inspection at the center of the front.
Is attached, and the door 32 is provided with support shaft metal fittings 32a, 32b.
With the fulcrum as a fulcrum, the handles 32c and 32d are openable and closable forward.

The heating chamber 26 is fixed on a pedestal 33, and the pedestal 33 is fixed to the ground by a fixing fitting 33a attached to the bottom surface.

The heater 27 generates heat by supplying power to the electrothermal heater elements 27a and 27b provided therein, and this heat energy is discharged to the heating chamber 26 from the hot air outlets 31a and 31b by the blower 28 through the hot air passage 31. To be done.

The heater 27 and the hot air passage 31 are surrounded by a heat insulating member in the same window as the heating chamber 26.

The hot air generator including the heater 27 and the blower 28 is fixed on the bottom surface of the pedestal 33.

In this embodiment, the transport roller drive mechanism 29 includes 18 transport roller units 34, a chain 35, and a motor 3.
It is composed of 6 and the like.

The transport roller unit 34 includes a transport roller 23, a coupling 39, a sprocket 37, and the like. The unit 34 heats the tunnel in the heating chamber 26 at a constant interval from the entrance 26a to the exit 26b in the direction orthogonal to the longitudinal direction of the tunnel. Eighteen chambers are provided on the bottom surface of the chamber 26, and further, the transport rollers 23 provided in each of the transport roller units 34 are located in the heating chamber 26, and the sprockets 37 are provided outside the heating chamber 26 (on the rear surface side in FIG. 2). It is provided.

That is, the shafts 23a, 2 on both sides of the transport roller 23
3b is rotatably supported by bearings of a pair of supporting members 38a and 38b raised from the bottom surface of the heating chamber 26, and one shaft 23b of the conveying roller 23 is connected to an external shaft 40 via a coupling 39. .

In addition, the outer shaft 40 has a microwave seal 41.
Through the first rotary bearing 42 and the second rotary bearing 43 on the outer side of the heating chamber 26, and is connected to the sprocket 37.

Therefore, when the sprocket 37 rotates, the transport roller 23 can rotate.

The transport roller 23 has a metal cylinder surface coated with a Teflon tube so that the rubber material does not adhere to the roller surface and become dirty.

In addition, the transport roller 23 of each transport roller unit 34
Is 100 to 180 mm.

FIG. 4 is an explanatory diagram of the transport roller driving mechanism 29. This figure is a view seen from the back side of the microwave oven 12, the left side of the sprocket _37-18 tunnel illustrated outlet 26
b side, the right side of the sprocket 37 - ₁ is the tunnel ingress 2
Each of them is located on the 6a side, and a total of 18 sprockets are arranged at predetermined intervals.

These sprockets 37- ₁ ～37- ₁₈ motor 36
The chain 35 is hung via the rotary gear 36a of the.

Thus, the chain 35 when the motor 36 rotates is shifted to the arrow direction, in proportion to the rotational speed of the motor 36 is interlocked rotation of the sprocket 37- ₁ ～37- _18.

Here, if the sprocket 37 - ₁ ～37- ₁₈ number of teeth of the same number, sprockets become all the same rotational speed, by increasing the number of teeth of a particular sprocket corresponds proportionally to the number of teeth sprocket The number of rotations of 37 increases.

The sprockets 37 can be easily replaced individually with sprockets 37 having different numbers of teeth.

That is, at the place where vulcanization and foaming occur, the number of teeth of each sprocket 37 is determined for each transport roller unit 34 so that the extruded rubber 22 can be transported along with the expansion due to the foaming reaction, and the corresponding transport roller unit 34 is determined. The sprocket 37 having a predetermined number of teeth is attached.

It should be noted that a group may be provided in which a plurality of transport roller units 34 are used as a unit, and the sprocket 37 may be attached so that the rotation speed of the transport roller 23 is changed for each group.

Further, at a portion where it is necessary to convey the extruded rubber 22 at the same speed, the number of teeth of the sprocket 37 is determined so that the speed is the same as the speed of the extruded rubber 22 at the time of extruding, and the sprocket 37 having the number of teeth is set to the above-mentioned part Attach to all transport roller units 34 in place. For example, since the foaming of the extruded rubber 22 is small until the microwave energy is applied, the conveying rollers arranged between the extruder 11 and the position where the microwave energy is irradiated can have the same rotation speed. .

The motor 36 is mounted on the bottom surface of the pedestal 33.
b and the guide gear 44 of the chain 35
And a tarmi prevention guide 45 is provided.

Although the sprocket 37 is rotated by the chain in this embodiment, it may be rotated by the toothed belt.

Next, NO. 1-NO. 3 Secondary heating furnaces 13, 14, 15
Will be described.

These secondary heating furnaces 13, 14 and 15 have a configuration in which the microwave oscillator 24 and the waveguide 25 are removed from the microwave heating furnace 12 described above, and as shown by common reference numerals in FIG. A heating chamber 26, a hot air generator including a heater 27 and a blower 28, and a transport roller driving mechanism 29 are provided.

However, since the elongation due to the foaming reaction and the location where it is generated differ depending on the type of the extruded rubber 22, it is necessary to adjust the rotation speed of the transport roller 23 in the same manner as above according to the elongation due to the foaming reaction.

Next, the vulcanizing apparatus 10 of the first embodiment configured as described above.
The operation of will be described.

First, as described in the conventional example, the raw material of the extruded rubber 22 charged into the cylinder 18 from the supply port 17 of the extrusion molding machine 11 is transferred by the screw 20 driven by the rotation of the motor 19 and molded from the molding die 21. Extruded.

Elongated extruded rubber 22 extruded from the extrusion molding machine 11
The microwave heating chamber 12, the NO. 1-NO. Three
After passing through the respective heating chambers 26 of the secondary heating furnaces 13, 14, 15 and taken by the continuous take-up machine 16.

In the molding process, the heating chamber 26 of the microwave heating furnace 12
In the inside, the extruded rubber 22 is rapidly heated to an appropriate vulcanization temperature by the internal heating energy due to the irradiation of microwaves from the microwave oscillator 24 and the hot air energy from the hot air generator.

Then, NO. 1-NO. 3 Secondary heating furnaces 13, 14, 1
In each heating chamber 26 of No. 5, the extruded rubber 22 performs the vulcanization reaction while maintaining the vulcanization temperature by the hot air energy from the hot air generator, and at the same time the foaming reaction is performed.

In the above description, the respective conveying rollers 23 at the portions only in the vulcanization reaction step are rotated in the same manner, and the extruded rubber 22 is conveyed at the same speed. In addition, in each of the conveying rollers 23 at a portion having a foaming reaction step in addition to the vulcanization reaction step, the number of rotations is sequentially increased in the conveying direction so as to convey the extruded rubber 22 along with the expansion due to the foaming reaction. The conveyance speed of the rubber 22 is increased. Thus, even if the extruded rubber 22 expands and expands due to the foaming reaction, the conveying speed of the extruded rubber 22 at that portion increases, so that a sponge rubber having a good shape can be produced without meandering.

Further, since the extruded rubber 22 successively moves over the respective conveying rollers 23 arranged at a predetermined interval, heat is not taken away at the contact surface with the respective conveying rollers 23, and a temperature difference that causes uneven heating is generated. Is reduced.

In addition, the extruded rubber 22 is allowed to expand freely between the conveying rollers 23, and the expansion due to the foaming reaction is made uniform.

Thus, the vulcanizing apparatus 10 of the first embodiment can produce sponge rubber having a uniform shape.

FIGS. 5 (a) and 5 (b) are explanatory views of the conveying roller portion of the vulcanizing apparatus showing the second embodiment.

In the second embodiment, the portion of the transport roller 23 in the first embodiment has a special shape, and has the same configuration as that of the first embodiment except for this portion.

That is, in the first embodiment, the cylindrical conveying roller 23
However, in the second embodiment, the conveying roller 23 of the first embodiment is integrally provided with the spacer ring shown in FIGS. 5 (a) and 5 (b).

In the vulcanizer 10 of the first embodiment, due to the shape of the extruded rubber 22, part of the shape may sag and deform due to its own weight. Therefore, in the second embodiment, the hanging portion of the extruded rubber 22 is held by the spacer ring provided on the conveying roller 23.

The shape of the spacer ring depends on the shape of the extruded rubber 22, and FIGS. 5 (a) and 5 (b) show an example thereof.
The extruded rubber 22 has a sectional shape.

FIG. 5A shows a case where sponge rubber is produced, and the peripheral surface of the spacer ring 46a provided on the conveying roller 23 rotates to hold a part 22a of the extruded rubber 22.

FIG. 5 (b) shows a case where solid rubber is produced. Spacer rings 46b and 46c are integrally provided on both sides of the conveying roller 23, and the portions 22b and 22c of the extruded rubber 22 are the same as in the case of sponge rubber. Hold.

In this way, a good shape can be obtained even if the extruded rubber 22 has a shape that is easily deformed by its own weight.

FIG. 6 is a block diagram of a vulcanizing apparatus showing a third embodiment.

This vulcanizer 47 is the same as the vulcanizer 47 of the present apparatus 10 shown in the first embodiment. 1, NO. 2 The arrangement method of the transport rollers 23 of the secondary heating furnaces 13 and 14 is changed from the horizontal plane by an angle θ (
The angle is in the range of 15 to 45 degrees as shown in the figure, and the other configurations are almost the same as those of the present apparatus 10 shown in the first embodiment.

In the first and second embodiments, since the extruded rubber 22 is conveyed on the horizontally arranged conveying rollers 23, it is simple in the case of sponge rubber which is a highly foamed product having a specific gravity of about 0.1. Even if the shape was good, it was deformed due to its own weight, and the shape was not good.

In this embodiment, NO. 1, NO. 2 Secondary heating furnace 13, 14
Since the self-weight of the extruded rubber 22 moving on the conveying roller 23 is reduced in the vertical direction, the deformation due to the self-weight is reduced.

Further, with respect to the elongation due to the foaming reaction, a part of its own weight is evenly applied in the carrying direction, so that the meandering phenomenon does not occur and the vehicle goes straight in the carrying direction.

In the third embodiment, NO. The third secondary heating furnace 48 conveys the extruded rubber 22 by a belt conveyor 49.

This is NO. 1, NO. 2 In the secondary heating furnaces 13 and 14, the foaming phenomenon that causes the deformation of the extruded rubber 22 is completed, and NO. This is because the extruded rubber 22 may be conveyed at the same speed in the third secondary heating furnace 48. However, NO. The 3 secondary heating furnace 48 may be of a conveyance roller type.

Finally, the concrete data of the above-mentioned third embodiment will be raised for reference.

(1) Extruder, manufactured by Mitsuba Seisakusho Co., Ltd. * Screw diameter: φ70 mm * Vacuum type * Head temperature: 50 ° C (2) Sponge rubber specifications * Base rubber polymer: Chloroprene rubber * Sponge rubber cross-sectional shape: Width 68mm × thickness 12mm (rectangle) * Specific gravity of sponge rubber: 0.25 (3) Microwave heating furnace * Output: 3.5KW * Frequency: 2450 ± 30MHz * Hot air temperature: 200 ° C * Conveyor roller condition a) Roller Diameter: φ50 mm b) Roller pitch: 150 mm c) Number of rollers: 25 d) Length between the first stage conveyor roller and the last stage conveyor roller: 150 x 24 = 3600 mm * Roller speed: 3 m / min (4) Secondary heating furnace * NO. 1 Secondary heating furnace conditions a) Hot air temperature: 200 ° C b) Roller diameter: φ50 mm c) Roller pitch: 150 mm d) Number of rollers: 12 e) Length between the first stage conveyor roller and the last stage conveyor roller : 150 × 20 = 3000 mm f) Roller speed: 3.6 m / min * NO. 2 Secondary heating furnace conditions a) Hot air temperature: 200 ° C b) Roller diameter: φ50 mm c) Roller pitch: 150 mm d) Number of rollers: 21 e) Length between the first stage conveyor roller and the last stage conveyor roller : 150 × 20 = 3000 mm f) Roller speed: 4.9 m / min * NO. 3 Conditions of secondary heating furnace a) Hot air temperature: 200 ° C b) Belt conveyor system c) Belt conveyor length: 8,000 mm d) Belt conveyor speed: 5.2 m / min (5) Continuous take-up machine * Caterpillar system * Transaction speed: 5.5 m / min Above, each embodiment has been described. However, when carrying out the present invention, the roller diameter of each of the transport rollers 23 is increased or decreased without changing the rotation speed of each of the transport rollers 23. Alternatively, the transport speed may be changed. Further, in the case of the first embodiment shown in FIG. 1 to FIG. 4, NO. 3 The secondary heating furnace 15 can be replaced with a conveyor mechanism of a belt conveyor, and in order to prevent the extruded rubber 22 from being deformed by its own weight, the microwave heating furnace 12 is inclined at a predetermined angle as in the third embodiment. It can be configured to.

The continuous vulcanizer of the present invention can also be used for producing solid rubber.

"Effects of the Invention" As described above, the present invention includes a large number of conveying rollers arranged at predetermined intervals as a means for conveying the unvulcanized rubber extruded product extruded in the vulcanization and foaming process of the continuous vulcanizer. Since it was used, the problem of uneven temperature of the unvulcanized rubber molded product before being heated by microwaves and hot air and uneven heating that occurs in the microwave heating furnace are solved. Change the number of teeth on the sprocket,
Further, by changing the roller diameter of the carrying roller to increase the carrying speed of the carrying roller in the carrying direction, the expansion of the unvulcanized rubber extruded product due to foaming is suppressed. The sponge rubber deformation is extremely small, and it is possible to effectively produce a product having a shape similar to the shape determined by the forming die of the extruder, and it is possible to easily produce a highly foamed rubber product. .

Further, in the production of highly foamed sponge rubber having a specific gravity of around 0.1, the respective conveyance rollers at the portion where the expansion due to the foaming reaction is the largest are sequentially lowered at a predetermined angle from the horizontal plane along the conveyance direction. As a result, the influence of the unvulcanized rubber extruded product due to its own weight is reduced, and it is possible to manufacture even a highly foamed sponge rubber which has been difficult to produce without uneven thickness or deformation.

As described above, the continuous vulcanizing apparatus of the present invention is suitable for the production of not only vulcanized products of unvulcanized rubber extruded products but also foamed products, and moreover, special shaped rubber products and highly foamed products that were difficult to produce. It is also an effective vulcanizer for rubber products.

[Brief description of drawings]

FIG. 1 is a block diagram of a continuous vulcanizer showing the first embodiment, and FIG.
FIG. 3 is a simplified front view of the microwave heating furnace, FIG. 3 is a simplified sectional view taken along the line AA in FIG. 2, FIG. 4 is an explanatory view of a transport roller driving mechanism, and FIG. FIGS. 5 (a) and 5 (b) are explanatory views of a conveying roller portion showing the second embodiment, FIG. 5 (a) showing a case of sponge rubber, and FIG. 5 (b) showing a case of solid rubber. FIG. 6 is a block diagram of a continuous vulcanizing apparatus showing the third embodiment, FIG. 7 is a block diagram of a continuous vulcanizing apparatus showing a conventional example, and FIGS. 8 (a) and 8 (b) are biased sponge rubbers. FIG. 8 (a) is a cross-sectional view of sponge rubber immediately after extrusion, FIG. 8 (b) is a cross-sectional view of sponge rubber after being affected by unbalanced heating, and FIG. 9 (a) and 9 (b) are views for explaining the influence of frictional resistance, and FIG. 9 (a) is a sectional view of an unvulcanized rubber molded product immediately after extrusion, and FIG. 9 (b). Is It is a cross-sectional view of the sponge rubber after a foam. 10 ... Continuous vulcanizing apparatus of the first embodiment 11 ... Extrusion molding machine 12 ... Microwave heating furnace 13 ... NO. 1 Secondary heating furnace 14 ... NO. 2 Secondary heating furnace 15 ... NO. 3 Secondary heating furnace 16 ... Continuous take-up machine 22 ... Extrusion rubber 23 ... Conveying roller 24 ... Microwave oscillator 26 ... Heating chamber 27 ... Heater 47 ... Continuous vulcanizing device of the third embodiment

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29K 105: 24

Claims (3)

[Claims] 1. An apparatus for continuously vulcanizing and foaming an unvulcanized rubber extruded product by microwave irradiation and hot air,
In the microwave heating furnace and the secondary heating furnace, a large number of conveying rollers for conveying the extruded product of unvulcanized rubber are sequentially arranged at predetermined intervals along the conveying direction, and each of the conveying rollers has a respective one. The sprocket, which is driven to rotate in series by a chain or toothed belt that is driven by a motor in the above-mentioned heating furnace, is rotatably supported by a conveyor roller located at the conveyor path where the unvulcanized rubber extruded product is deformed by the foaming reaction. A continuous vulcanization device for an unvulcanized rubber extruded product, characterized in that the rotational speed is changed by changing the number of teeth of the sprocket. 2. An apparatus for continuously vulcanizing and foaming an unvulcanized rubber extruded product by microwave irradiation and hot air,
In the microwave heating furnace and the secondary heating furnace, a large number of conveying rollers for conveying the extruded product of unvulcanized rubber are sequentially arranged at predetermined intervals along the conveying direction, and the unvulcanized rubber extruded product Of the unvulcanized rubber extruded product is characterized in that the roller diameter of the conveying roller located in the conveying path portion where is deformed by the foaming reaction is changed, and a large number of conveying rollers are driven at the same rotational speed. Sulfurizer. 3. An apparatus for continuously vulcanizing and foaming an unvulcanized rubber extruded product by microwave irradiation and hot air,
In the microwave heating furnace and the secondary heating furnace, a large number of conveying rollers for conveying the extruded product of unvulcanized rubber are sequentially arranged at predetermined intervals along the conveying direction, and the unvulcanized rubber extruded product The conveyor rollers arranged in a certain range in a portion having a large expansion due to the foaming reaction are sequentially arranged lower along the conveying direction to incline the conveyor path of the unvulcanized rubber extruded product at a predetermined angle from the horizontal plane. A continuous vulcanization device for an unvulcanized rubber extruded product, which has a constitution.