JPH0120049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the thermal bonding of plastic films, and more particularly to an improved apparatus for superimposing and thermally bonding plastic films.

Plastic film has excellent mechanical strength, transparency, oil resistance, weather resistance, etc., and is widely used in various fields such as daily necessities, industrial, medical, and agricultural fields. When these plastic films are actually used, in addition to being processed into bag-like and cylindrical shapes, they are also often processed into wider widths.

Conventionally, heat sealing, impulse sealing, ultrasonic sealing, high frequency sealing, and the like are known as methods for bonding (sealing) plastic films and the like. The adhesive method is selected depending on the type of plastic in the plastic film and the intended use of the article to be adhered. Recently, in order to improve the performance of plastic films, techniques such as forming a film on the surface or forming multiple layers have been adopted, but there has been a problem that such films are difficult to adhere.

In order to solve this problem,
Publication No. 19341, Special Publication No. 16546, Special Publication No. 1972-16546, Special Publication No. 16546
An adhesive device described in Publication No. 13318 has been proposed and put into practical use. However, there has been a problem in that the strength of the bonded surfaces bonded by these devices is not necessarily sufficient.

Under such circumstances, the inventors of the present invention have made extensive studies in order to provide a thermal bonding device that can easily bond not only general plastic films but also plastic films with a special film formed on the surface. , which led to the completion of the present invention.

Therefore, the gist of the present invention is to provide an apparatus for thermally bonding a plurality of plastic films by stacking them between a pair of plastic film transfer endless belt mechanisms disposed opposite each other, and transferring the plastic films. The first endless belt mechanism has two drive rolls on which the endless belt is stretched rotatably supported, and a drive means for driving the endless belt on the shafts of the two drive rolls. The second endless belt mechanism rotatably supports two rolls on which the endless belt is stretched, and integrally supports the first endless belt mechanism.
A plastic film thermal bonding device is characterized in that it is equipped with means for approaching and separating.

Hereinafter, the present invention will be described in detail based on the drawings, but the present invention is not limited to the following examples unless it exceeds the gist thereof.

The figures show an example of a plastic film thermal bonding device according to the present invention, in which FIG. 1 is a schematic side view of the main parts of the device, FIG. 2 is a schematic cross-sectional view taken along the - line in FIG. It is a cross-sectional diagram taken along the - line in the figure.

In the figure, 1 is a first endless belt mechanism, 2 is a second endless belt mechanism, 3 is a table, 4 and 5 are drive rolls of the first endless belt mechanism, 6 is an endless belt, 7 is a motor, 8, 9 is a pulley, 10 is a belt, 11 is a heating block, 12 is a heater,
13 is a heating block support, 14 is a bolt, 15
16 is the first endless belt mechanism support block; 17 is the shaft of the roll 4; 18 is the fixing bolt of the heating block support 13; 19 is the cooling block;
0 indicates a cooling block support, 21 indicates a bolt, and 22 indicates an air conduit to the cooling block.

23 is a support block of the second endless belt mechanism;
24 and 25 are rolls of the second endless belt mechanism;
6 is an endless belt, 31 is a heating block, 33 is a heater, 33 is a support for heating block 31, 34
35 is a bolt, 35 is a spring, 36 is a thermocouple of the heating block, 37 is an axis of the roll 24, 38 is a fixing bolt of the heating block support 33, 39 is a cooling block, 40 is a cooling block support, 14 is a bolt,
42 is an air conduit to the cooling block, 43 is a fluid pressure cylinder, 44, 45 are electromagnetic valves, 46 is a compressed fluid conduit, 47 is an instrument panel, 48 is a support arm, 49 is a plastic film end guide piece, 50 ,51
indicates a groove, and 52 and 53 indicate plastic films.

The plastic film thermal bonding apparatus according to the present invention is provided with a pair of endless belt mechanisms facing each other. These endless belt mechanisms have the function of sandwiching and transporting the plastic film to be thermally bonded between both endless belts, and thermally bonding the plastic film while it is being transferred. Although the pair of endless belt mechanisms are arranged one above the other in the figure, it goes without saying that the arrangement is not limited to this example.

In the first endless belt mechanism 1 of the pair of endless belt mechanisms described above, two drive rolls 4 and 5 on which an endless belt 6 is stretched are rotatably mounted on a first endless belt support block 16. It is pivoted. The first endless belt support block 16 is fixed, for example, to the table 3 so as not to move.

The two drive rolls 4 and 5 function to drive an endless belt 6 stretched between both rolls. It is preferable that the center axes of both rolls are arranged in parallel. The distance between the center axes of both rolls can be appropriately selected depending on the type, thickness, etc. of the plastic film to be thermally bonded. The drive rolls 4 and 5 are made of rubber, metal, plastic,
Although it can be manufactured from materials such as wood, it is preferably manufactured from metal materials. Drive rolls 4, 5
The length, diameter, etc. can be appropriately selected depending on the type, thickness, etc. of the plastic film to be thermally bonded.

Endless belt 6 stretched between drive rolls 4 and 5
The plastic film to be hot glued,
Endless belt 2 provided in the second endless belt mechanism
Together with 6, it functions to pinch and transfer. Preferably, the width of the endless belt is approximately the same as the length of the drive rolls 4 and 5. The material of the endless belt is preferably selected from metals, plastics, etc., and among them, heat-resistant plastics such as silicone resins, fluorine resins, etc. are preferred.

The drive rolls 4 and 5 on which the endless belt 6 of the first endless belt mechanism is stretched are provided with a drive means for driving the drive rolls 4 and 5. The figure shows an example in which a pulley 8 is provided at the tip of the roll shaft 17 of the roll 4, and a belt 10 is stretched between the pulley 8 and a pulley 9 provided on the motor 7. The belt 10 may be stretched over pulleys provided on both the rolls 4 and 5, and may have a structure in which the belts 10 are interlocked with each other.

The first endless belt mechanism 1 is provided with a heating block and a cooling block in a portion surrounded by the endless belt 6. The heating block 11 is heated by a heater, and this heat is passed through the endless belt 6 to heat the bonding location of the plastic film to be thermally bonded. Therefore, it is preferable to embed a heater 12 in the heating block 11. In addition, in order to bring the heating block 11 into contact with the side of the endless belt 6 that heats the plastic film to be thermally bonded, the heating block support 13 is attached to the first endless belt mechanism support block 16 by means of bolts 18. Preferably, the heating block support 13 and the heating block 11 are fixed, and the heating block support 13 and the heating block 11 are guided by bolts 14 and biased against the inner surface of the endless belt 6 by springs 15. Both the heating block 11 and the heating block support 13 supporting it are made large enough to be accommodated in the area surrounded by the endless belt 6, as shown in FIG. It is preferable that the width of the heating block 11 is equal to or slightly narrower than the width of the endless belt 6. The material of the heating block 11 is preferably a metal material.

The cooling block 19 is a heated endless belt 6.
It is provided for the purpose of cooling. Cooling is most effectively achieved by blowing air. The cooling block 19 is made of a metal material with high thermal conductivity and has a hollow interior so that air directed through an air conduit 22 to the cooling block is blown onto the inner surface of the endless belt 6. In order to do this, the first endless belt mechanism support block 1
6, the cooling block support 2 is secured by bolts 18.
0 is fixed, and the cooling block support 20 and the cooling block 19 are preferably guided by bolts 21 and biased against the inner surface of the endless belt 6 by a spring.

Both the cooling block 19 and the cooling block support 20 supporting it are sized so that they can be accommodated in the area surrounded by the endless belt 6 together with the heating block 11, as shown in FIG.
It is preferable that the width of the cooling block 19 is slightly narrower than the width of the endless belt 6.

When fixing the first endless belt mechanism 1 to the table 3, it is preferable to fix it so that the surface of the endless belt 6 forms the same surface as the surface of the table 3.

In the second endless belt mechanism 2 provided opposite to the first endless belt mechanism 1, first, two rolls 24 and 25 on which an endless belt 26 is stretched are attached to the second endless belt mechanism support block 23. Each is rotatably supported on a shaft. FIG. 2 shows an example in which the roll 24 is pivotally supported on the second endless belt mechanism support block 23 by a roll shaft 37. The roll 25 is also pivoted in the same manner. These two rolls 24 and 25 function to stretch the endless belt 26. Both rolls are arranged so that their central axes are parallel, and also parallel to the central axes of the rolls of the first endless belt mechanisms 4 and 5. As shown in FIG. 1, the roll 24 is opposed to the roll 4, and the roll 25 is opposed to the roll 5. The rolls 24 and 25 are made of rubber,
It can be made from materials such as metal, plastic, and wood, but is preferably made from metal materials. The lengths, diameters, etc. of the rolls 24, 25 are preferably the same as those of the drive rolls 4, 5.

Endless belt 26 stretched between rolls 24 and 25
The plastic film to be hot glued,
Endless belt 6 provided in the first endless belt mechanism
It also functions to pinch and transport the material. The width of the endless belt 26 is preferably the same as the width of the endless belt 6, and the material thereof is also preferably the same as that of the endless belt 6.

The second endless belt mechanism 2 includes an endless belt 26
A heating block and a cooling block are provided in the area surrounded by. The heating block 31 is heated by a heater, and this heat is passed through the endless belt 26 to heat the bonding location of the plastic film to be thermally bonded. Therefore, it is preferable to embed a heater 32 in the heating block 31. In order to bring the heating block 31 into contact with the side of the endless belt 26 that heats the plastic film to be thermally bonded, the heating block support 33 is connected to the second endless belt mechanism support block 23 by means of bolts 38. is fixed, and this heating block support 33 and heating block 31 are
The endless belt 2 is guided by the bolt 34 and the spring 35
It is preferable to have a structure in which the inner surface of 6 is biased.

Both the heating block 31 and the heating block support 33 supporting the same are made large enough to be accommodated in the area surrounded by the endless belt 26, as shown in FIG. The width of the heating block 31 is
It is preferable that the width be the same as the width of the heating block 11 provided in the first endless belt mechanism, and as shown in FIG. 1, the heating block 11 and the heating block 31 are provided at opposing positions. The heating block 31 is preferably made of a metal material. The heating block 31 includes
Preferably, a thermocouple 36 is provided to allow automatic adjustment of the temperature.

The cooling block 39 is a heated endless belt 2.
It is provided for the purpose of cooling 6. Cooling is most effectively achieved by blowing air. The cooling block 39 is made of a metal material with high thermal conductivity, has a hollowed out interior, and directs air to the cooling block through an air conduit 42 to the endless belt 26.
Make sure to spray it on the inside surface. To do this, the cooling block support 4 is attached to the second endless belt mechanism support block 23 by means of bolts.
It is preferable to have a structure in which the cooling block support 40 and the cooling block 39 are guided by bolts 41 and biased against the inner surface of the endless belt 26 by a spring. Both the cooling block 39 and the cooling block support 40 supporting it are of such a size that they can be accommodated together with the heating block 31 in the area surrounded by the endless belt 26, as shown in FIG. The width of the cooling block 39 is
It is preferable to make the width slightly narrower than the width of the endless belt 26.

The plastic film thermal bonding apparatus according to the present invention is provided with means for integrally moving the second endless belt mechanism toward and away from the first endless belt mechanism.

The figure shows the second endless belt mechanism support block 2.
3 is connected to a fluid pressure cylinder 43, and the fluid pressure cylinder 43 is supported by a support arm 48.
The fluid pressure cylinder 43 is fixed to the support arm 48, and the pressure of the fluid supplied to the fluid pressure conduit 46 is controlled by the solenoid valve 4.
4 and 45, the piston fitted into the fluid pressure cylinder 43 is slid, and the second endless belt mechanism support block 23 can be moved. The second endless belt mechanism support block 23 incorporates rolls 24, 25, heating block 31, and cooling block 39, so when the second endless belt mechanism support block 23 is moved,
Everything built into these moves together. This second endless belt mechanism support block 23
Although it is preferable to use a fluid pressure cylinder to approach and separate from the first endless belt mechanism side, the method is not limited to this, and a toggle method or other methods can also be adopted.

The support arm 48 is preferably provided with an instrument panel 47 that includes a power switch, instruments, an air fan for supplying air to the cooling block 39, etc., so that work conditions can be easily grasped during the bonding work.

An example of thermally bonding film ends together using the plastic film thermal bonding apparatus according to the present invention is shown below.
It is shown below.

First, the endless belt 6 of the first endless belt mechanism 1
is driven to raise the temperature of the heating block 11, and the temperature of the heating block 31 of the second endless belt mechanism 2 is also raised. Next, the second endless belt mechanism 2 is brought close to the first endless belt mechanism 1, the endless belts 6 and 26 come into contact, and both are rotated in the direction of the arrow in FIG. On the other hand, the ends of the plastic films 52, 53 to be thermally bonded are positioned within the grooves 50, 51 of the plastic film end guide pieces, and in the positioned state are inserted between the endless belts 6, 26. , transport. During the transfer, the heat from the heating blocks 11 and 31 is conducted to the film via the endless belts 6 and 26, respectively, and the pressing force applied from the heating blocks 11 and 31 thermally bonds the film. The thermally bonded parts are cooled by air blown from cooling blocks 19, 39 and are transferred to the left side in FIG. After the thermal bonding is completed, the second endless belt mechanism is separated from the first endless belt mechanism.

The bonding apparatus according to the present invention can be provided with a mechanism for supporting the feeding film on the film supply side, and a film winding mechanism on the side where the film after bonding is fed.

In order to thermally bond plastic films using the plastic film thermal bonding apparatus according to the present invention, thermal bonding conditions can be selected depending on the type of plastic, the thickness of the film, etc. The conditions for thermal bonding are the temperature of the heating block, the pressing force applied to the plastic film bonding part (this is the spring 15,
It can be adjusted by the urging force of 35, the pressing force of a hydraulic cylinder or a toggle. ), and the plastic film transport speed (which can be adjusted by connecting a transmission to the motor 7), etc.
Can be adjusted.

As exemplified above, the plastic film bonding device according to the present invention is used to bond the ends of two plastic films together, and also to bond the ends of two plastic films together, as well as the center portion of the film and the film to form a bag shape. It can be used for a wide range of purposes, such as making it cylindrical, and providing a section at the end of the film for passing tape or pipes through. The applicable plastic film may be any film that can be thermally bonded, or may be a film with a special film formed on its surface.

The plastic film thermal bonding device according to the present invention has the following effects, and its industrial utility value is extremely large.

(1) Since the plastic film thermal bonding device according to the present invention has a wide range of selectable bonding work conditions, it is possible to change, select, and bond many plastic films so that the strength of the bonded portion is optimized. It can be used in an extremely wide range of applications.

(2) The plastic film thermal bonding device according to the present invention applies not only the urging force of the spring but also the pressing force of the second endless belt mechanism to the fluid pressure cylinder or toggle. Since the tension can be adjusted, it is easy to increase the strength of the bonded part.

(3) In the plastic film thermal bonding device according to the present invention, the first endless belt mechanism is driven, and the second endless belt mechanism is driven by being pressed against the first one, so that there is no gap between the two. Shearing stress is applied to the bonded film, and the bonded parts of the films become smooth, and the surface of the film at the bonded part can also be made smooth, making the transparency of the bonded part not much different from that of other parts and making it less noticeable. You can avoid it.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the main parts of an example of the plastic film thermal bonding device according to the present invention, and FIG.
The figure is a schematic cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is a schematic cross-sectional view taken along the - line in FIG. In the figure, 1 is a first endless belt mechanism, 2 is a second endless belt mechanism, 3 is a table, 4 and 5 are drive rolls of the first endless belt mechanism, 6 is an endless belt, 7 is a motor, 8, 9 is a pulley, 10 is a belt, 11 is a heating block, 12 is a heater,
13 is a heating block support, 14 is a bolt, 15
16 is a spring, 16 is a first endless belt mechanism support block, 19 is a cooling block, 20 is a cooling block support, 21 is a bolt, and 22 is an air conduit to the cooling block. Further, 23 is a support block of the second endless belt mechanism, 24 and 25 are rolls, 26 is an endless belt, 31 is a heating block, 32 is a heater, 33 is a support for the heating block 31, 34 is a bolt, and 35 is a spring. , 36 is a thermocouple of the heating block, 39 is a cooling block, 40 is a cooling block support, 41 is a bolt, 42 is an air conduit to the cooling block, 43 is a fluid pressure cylinder, 44, 45 is a solenoid valve, 46 is a compression Fluid conduit, 47 is an instrument panel,
48 is a support arm, 49 is a plastic film end guide piece, 50 and 51 are grooves, and 52 and 53 are plastic films, respectively.

Claims (1)

[Scope of Claims] 1. In an apparatus for thermally bonding a plurality of plastic films by stacking them and sandwiching them between a pair of plastic film transfer endless belt mechanisms disposed to face each other and transferring the plastic films, the first endless belt The mechanism includes two drive rolls on which the endless belt is stretched, rotatably supported, and a drive means for driving the endless belt on the shafts of the two drive rolls. The second endless belt mechanism rotatably supports two rolls on which the endless belt is stretched, and is provided with a means for integrally approaching and separating them from the first endless belt mechanism. A plastic film thermal bonding device characterized by being bonded to a plastic film. 2 The two drive rolls of the first endless belt mechanism and the two rolls of the second endless belt mechanism are:
2. The plastic film thermal bonding device according to claim 1, wherein each roll shaft is supported parallel to and opposite to each other. 3. A patent claim characterized in that each endless belt mechanism is provided with a heating block and a cooling block in a portion surrounded by each endless belt and at positions facing each other with each endless belt interposed therebetween. A thermal bonding device for plastic film according to item 1 or 2 of the scope of the invention. 4. Claim 1, characterized in that the means for integrally bringing the second endless belt mechanism closer to and away from the first endless belt mechanism is constituted by a fluid pressure cylinder. 3. A plastic film thermal bonding device according to item 3.