JPH07314558A - Welding machine for thermoplastic resin film - Google Patents

Abstract

PURPOSE:To provide a welding machine, for joining films of any materials and improving the workability of fusion welding regardless of the qualities of the film materials. CONSTITUTION:A welding machine is provided with a pressure welding means 14, for joining opposed parts 3, 4 of superposed films materials 1, 2 made of thermoplastic resin, and a supporting plate 12, located near the pressure welding part 24 for the pressure welding means 14 and inserted extractably between the parts 3, 4 deviated from the pressure welding part 24. A coil 25, generating fluxes 25a by impressing a voltage thereon, is provided. The coil 25 is arranged so that the supporting plate 12 enters the fluxes 25a. The pressure welding mean 14, the supporting plate 12, the coil 25 and the opposed parts 3, 4 are permitted to move relatively along the lengthwise direction of the opposed parts 3, 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film material welding machine used for forming a film body constituting a tent warehouse or the like by welding a plurality of thermoplastic resin film materials to each other.

[0002]

2. Description of the Related Art In order to weld a plurality of thermoplastic resin film materials to each other, an indirect heating type welding machine using a high frequency dielectric, an ultrasonic seal, an impulse seal or the like has been conventionally used.

A direct heating type welding machine using hot air, a hot platen, a hot blade or the like is also used.

[0004]

However, even if the film materials to be welded to each other are both made of a thermoplastic resin, if they are to be welded by the indirect heating type welding machine, due to the nature of this method, Depending on the material of the film material, there are those that can be welded and those that cannot be welded, and it is not possible for each model to weld all film materials. Therefore, when performing a welding operation using this type of welding machine, there is a problem in workability that it is necessary to select one of the welding machines for each material of the film material to be welded.

On the other hand, in the above-mentioned direct heating type welding machine, if the object is made of a thermoplastic resin, any film material can be welded, but when hot air is used, this hot air is used. However, there is a problem in that it causes unnecessary heating up to a portion other than the portion to be welded over a wide range, and there is also a problem in that smoke is generated during this heating and workability is reduced.

On the other hand, when a hot platen is used, the hot platen is first pressure-welded to the portion to be welded, and then the hot platen is separated from the portion to be welded to the next point. First, it is necessary to repeat the pressure welding and the separation and to proceed with the welding work in sequence. Therefore, according to the hot plate, there is a problem that the welding work becomes intermittent and the workability is poor.

Further, when the hot blade is used, it is required that a predetermined amount of heat energy is always stored in the hot blade in order to overcome the heat absorption of the portion to be welded. It is necessary to have a volume, which tends to make the hot blade large. Therefore, it becomes complicated to insert the hot blade between the facing portions of both film materials.

Further, since the hot blade is large as described above, there are the following problems. That is, when the hot blades are relatively moved along the longitudinal direction between the facing parts, the facing parts are brought into pressure contact with each other by the pressure contact means from a state in which the hot blades are greatly expanded. It will be greatly bent by. Further, such a large amount of bending hinders smooth relative movement between the facing portions and the hot blade, resulting in poor workability of welding.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and enables the film materials to be welded to each other regardless of the material of the film materials, and the workability of the welding is improved. The purpose of the present invention is to provide a welding machine.

[0010]

In order to achieve the above object, the thermoplastic resin film material welding machine of the present invention is capable of press-contacting both facing parts of the thermoplastic resin film materials which are superposed on each other. And a ferromagnetic material that is inserted between the facing portions that are offset from the pressure contact portion in the vicinity of the pressure contact portion by the pressure contact means and that can be inserted and removed freely. On the other hand, magnetic force lines are generated by applying a voltage. A coil is provided, and the coil is arranged so that the ferromagnetic substance enters the magnetic field lines.
The pressing means, the ferromagnetic material, and the coil and both facing parts are made relatively movable along the longitudinal direction of these facing parts.

In the above case, the ferromagnetic body may be a flat plate-like body extending along both facing portions of both film materials.

Further, a pressing means for pressing the facing portion facing the ferromagnetic material against the ferromagnetic material may be provided.

The pressure contact means, the ferromagnetic material, the coil, and the support for supporting them are integrated to form an assembly, and the assembly and both facing parts are provided along the longitudinal direction of these facing parts. It may be relatively movable.

[0014]

[Operation] The operation of the above configuration is as follows.

In the "action" section, the terms in the following parentheses correspond to the terms in the claims.

In the vicinity of the pressure contact portion 14 by the pressure contact means 14 and the pressure contact means 24 by which the two facing parts 3, 4 of the thermoplastic resin film materials 1, 2 which are superposed on each other can be pressed against each other, this pressure contact part 24 is provided. Same as above, both facing parts deviated from 3, 4
A support plate (ferromagnetic material) 12 that can be inserted and removed is provided between the support plate (ferromagnetic material) 12 and a coil 25 that generates a magnetic force line 25a when a voltage is applied. Arrange the coil 24 so as to enter inside,
The pressing means 14, the support plate (ferromagnetic material) 12, the coil 25, and the facing parts 3 and 4 are relatively movable along the longitudinal direction of the facing parts 3 and 4.

Therefore, by applying a voltage to the coil 25,
When a magnetic force line 25a is generated, a spiral current 25b is generated in the support plate (ferromagnetic material) 12 by the magnetic force line 25a.
Flows, and the electric resistance at this time causes the support plate (ferromagnetic material) 12 to generate heat. Then, the support plate (ferromagnetic material) 12 heats and melts the facing portions 3 and 4 of the film materials 1 and 2 facing the support plate (ferromagnetic material) 12. Next, the pressing means 14 and the supporting plate (ferromagnetic material) 1
2, the coil 25 and the facing parts 3 and 4 are moved relative to each other, and the melted portions of the facing parts 3 and 4 are pressed against each other by the pressing means 14, so that the facing parts 3 and 4 are welded to each other. Will be done.

Since the facing portions 3 and 4 of the film materials 1 and 2 are directly heated by the heat of the support plate (ferromagnetic material) 12, what kind of material the film materials 1 and 2 are made of? However, these can be welded to each other.

Further, the pressing means 14, the support plate (ferromagnetic material) 12, the coil 25 and the facing parts 3 and 4 are relatively continuous along the longitudinal direction of the facing parts 3 and 4. When the support plate (ferromagnetic material) 12 is sandwiched, the facing portions 3 and 4 are sequentially heated and melted by the support plate (ferromagnetic material) 12 along with the movement, and the pressure contact means is used. By means of the pressure contact 14, the two facing parts 3, 4 are welded continuously.

In the above case, the support plate (ferromagnetic material) 12 may be a flat plate-like member extending along the facing portions 3 and 4 of the film materials 1 and 2.

In this way, the support plate (ferromagnetic material) 1
It becomes easy to insert 2 into the space between the facing portions 3 and 4 of the film materials 1 and 2 so that the film 2 can be freely inserted and removed.

Further, when the support plate (ferromagnetic material) 12 is relatively moved along the longitudinal direction of the two facing parts 3 and 4 sandwiching the support plate (ferromagnetic material) 12, since the support plate (ferromagnetic material) 12 is flat, The degree of expansion of the facing portions 3 and 4 by inserting the support plate (ferromagnetic material) 12 becomes extremely small. Therefore, the amount of bending from the state where the facing portions 3 and 4 are expanded by the support plate (ferromagnetic body) 12 to the time when they are brought into pressure contact with each other by the pressure contact portion 24 is suppressed to an extremely small amount. , 4 and the support plate (ferromagnetic material) 12 can be moved relatively smoothly.

A pressing means 32 may be provided for pressing the supporting plate (ferromagnetic material) 12 at the facing portions 3 and 4 facing the supporting plate (ferromagnetic material) 12.

In this way, the facing portions 3 and 4 are pressed against the support plate (ferromagnetic body) 12 by the pressing means 32, so that the facing surfaces 3 and 4 and the supporting plate (ferromagnetic body) are pressed. ) 12, the efficiency of heat transfer to and from the support plate (ferromagnetic material) 12 is improved, and heating by the support plate (ferromagnetic material) 12 becomes more effective.

The pressure contact means 14 and the supporting plate (ferromagnetic material)
12, coil 24, and support 1 that supports these
0 may be integrated to form an assembly 36, and the assembly 36 and both facing portions 3 and 4 may be relatively movable along the longitudinal direction of these facing portions 3 and 4.

In this way, the relative positions of the pressure contact means 14, the support plate (ferromagnetic material) 12, and the pressure contact portion 24 are made constant by the support body 10. Therefore, in particular, it is possible to weld the both facing parts 3 and 4 by moving only the assembly 36 while keeping the facing parts 3 and 4 stationary. That is, if the welding machine 6 is configured as described above, the welding machine 6 can be carried.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numerals 1 and 2 denote a pair of film materials which are welded to each other, and both of these film materials 1 and 2 are made of a thermoplastic resin. Note that, for convenience of explanation, the direction of the arrow Fr in the drawing is the front. The right and left described below means the direction toward the front.

The above-mentioned film materials 1 and 2 are arranged side by side, and the left and right film materials 1 and 2 are stacked side by side so that the right end edge of the left film material 1 is the upper side and the left end edge of the right side film material 2 is the lower side. The edges are facing portions 3 and 4, respectively.

A welding machine 6 for heating and welding the facing portions 3 and 4 to each other is provided. A film body 7 having a large area is formed by this welding, and the film body 7 is used for a large-sized film structure or the like that constitutes a tent warehouse.

The welding machine 6 has a welding machine body 9, and the welding machine body 9 has a support 10. The support 10 includes a vertically oriented substrate 11 located near the outer side (right side) of the facing portion 3 of the left membrane material 1, and a support plate 12 detachably attached to a lower portion of the substrate 11.
The cover body 13 is detachably attached to the upper part of the same substrate 11.

A press-contact means 14 is provided which allows the facing portions 3 and 4 in the vicinity of the rear of the support 10 to press-contact each other. The pressure contact means 14 will be described. The pressure contact means 14 is entirely made of a non-magnetic material. An upper arm 15 is attached to the support 10 and the upper arm 1
The reference numeral 5 integrally projects rearward from the substrate 11. A roller shaft 16 whose axial center extends in the left-right direction is supported by the projecting end of the upper arm 15, and an upper roller 17 is rotatably supported by the roller shaft 16 around the axial center.

A lower arm 20 is detachably attached to the left end portion of the substrate 11 of the support 10 with a bolt 19. A projecting end of the lower arm 20 extends rearward, and a roller shaft 21 having an axial center extending left and right is supported by the projecting end, and a lower roller 22 is rotatably supported by the roller shaft 21 about the axial center thereof. .

In the above case, the projecting end of the upper arm 15 is located on one side (right side) in the left-right direction, the projecting end of the lower arm 20 is located on the other side (left side), and both projecting ends are Vertically separated. Then, the upper roller 17 protrudes from the protruding end of the upper arm 15 toward the other side (left side),
The lower roller 22 projects from the projecting end side of the lower arm 20 toward one side (to the right).

The upper roller 17 and the lower roller 22 have the same shape and the same size as each other, and are substantially parallel to each other, and the two facing portions 3 overlapped with each other in the gap 23 between the upper roller 17 and the lower roller 22. , 4 are inserted in such a manner that they can be inserted and removed so as to be sandwiched therebetween, whereby the facing portions 3 and 4 are pressed against each other.

The support plate 12 is removably inserted in the vicinity of the pressure contact portions 24 of the facing surface portions 3 and 4 by the pressure contact means 14 and between the facing surface portions 3 and 4 which are offset from the pressure contact portion 24 forward. ing. The support plate 12 is a ferromagnetic material, and more specifically, made of iron. The support plate 12 is a flat plate member having a uniform thickness and extending substantially horizontally along the facing portions 3 and 4.

A coil 25 is provided near the upper part of the support plate 12.
The coil 25 is provided with the cover body 1 of the support body 10.
3 is detachably attached to the bracket 3 by a bracket 13a. The coil 25 includes a coil body 26 and a non-conductive coil cover 27 that covers the coil body 26. A power source 29 is attached to the coil body 26 of the coil 25.
When a high-frequency alternating current is applied by applying a voltage from the coil main body 26, the coil body 26 generates magnetic force lines 25a. The coil 25 is arranged so that the support plate 12 is inserted in the magnetic force line 25a.

An air-cooling fan 30 for air-cooling the coil cover 27 is provided to improve the performance and life of the coil 25.

The facing portion 3 facing the upper surface of the support plate 12
A pressing means 32 is provided for pressing the above portion against the support plate 12. The pressing means 32 is composed of a pair of front and rear idle rollers 33, 33 each having an axial center extending left and right, and a belt-made endless body 34 wound around the idle rollers 33, 33. The roller 33 is rotatably supported on the support body 10 about its axis.

The pressure contact means 14, the support plate 12, the coil 2
5, pressing means 32, and support 1 for supporting these
0 are integrated with each other to form an assembly 36. Then, along the longitudinal direction (front-rear direction) of both the facing parts 3 and 4, the facing parts 3 and 4 and the assembly 36.
And are relatively movable.

When the two facing parts 3 and 4 are welded to each other, first, the facing parts 3 and 4 are sandwiched between the upper roller 17 and the lower roller 22, and in the vicinity of the front of the sandwiching part. The support plate 12 is inserted between the facing parts 3 and 4 which are expanded vertically.

Next, a voltage is applied to the coil body 26 of the coil 25 to generate the magnetic force lines 25a. Then, due to the magnetic lines of force 25a, a spiral current 25b flows in the support plate 12, which is a ferromagnetic body, and the electric resistance at this time causes the support plate 12 to generate heat. And this support plate 1
Due to 2, the facing portions 3 and 4 facing the support plate 12 are heated and melted. The facing parts 3 and 4 and the assembly 36 are continuously moved relative to each other along the longitudinal direction (front-back direction) of the facing parts 3 and 4, and the facing parts 3 and 4 are opposed to each other.
If the melted portions of are brought into pressure contact with each other by the pressure contact means 14,
The facing portions 3 and 4 are continuously welded to each other, and the film body 7 is formed.

Further, the facing parts 3 and 4 and the assembly 36 are
When the and are moved relative to each other, the endless body 34 is pressed against the facing portion 3 so as to be frictionally joined. At this time, as shown by the arrow A in FIG. Rotate.

Then, the facing portion 3 is pressed against the support plate 12 by the pressing means 32, whereby the facing portion 3
The efficiency of heat transfer between the support plate 12 and the support plate 12 is improved, and heating by the support plate 12 becomes more effective. Further, the pressing means 32 is made small, and the support plate 12 and the coil 25 are
And are arranged so that they are close to each other,
It is supposed that the support plate 12 becomes higher in temperature by generating the spiral current 25b having a large value.

Incidentally, the same means as the pressing means 32 is provided on the lower side of the facing portion 4 so that the idler roller 33 is supported by the supporting plate 12 of the supporting body 10, and the endless body 34 thereof supports the facing portion 4 above.
May be pressed against the support plate 12 side. By doing so, the same action and effect as those of providing the pressing means 32 to the facing portion 3 can be obtained.

According to the above construction, the support plate 12 which is a part of the support body 10 is made of a ferromagnetic material so that the parts can be used in common, and the structure of the welding machine 6 is simplified accordingly. ing.

Although the above is based on the illustrated example, the support plate 1
2 may be composed of a pair of upper and lower stainless steel plates and an aluminum plate sandwiched between the two plates. By doing so, the amount of heat energy that can be stored is increased and the welding performance is improved.

Further, the bolt 19, the lower arm 20, the roller shaft 21, and the lower roller 22 may be omitted. In this case, both facing parts 3 and 4 are placed on the work table 37 and the above facing parts 3 and 4 are placed. The welding work of 4 may be performed.

Further, the pressing means 32 may be a simple sliding plate, and in this case, the construction of the welding machine 6 becomes simple.

The film materials 1 and 2 may be the same material or different materials. Further, as long as it is thermoplastic, a general resin material may be used, but a PVC coated fiber woven fabric is particularly preferable as an object of the welding machine 6 of the above-mentioned embodiment, that is, according to this material, the welding is smooth and You can definitely.

In addition to the tent warehouse, the film body 7 is a general tent, a dome made of a film body in a baseball field, a flexible container used for transporting powder particles, and a civil engineering sheet used in the field of civil engineering. And so on.

[0052]

According to the present invention, the pressure contact means for allowing two opposing surface portions of the thermoplastic resin film materials to be pressed against each other can be pressed against each other, and in the vicinity of the pressure contact portion by the pressure contact means, the pressure contact portion is offset from the pressure contact portion. And a ferromagnetic body that is inserted between the opposite facing portions so that the ferromagnetic body can be inserted into the magnetic field line by applying a voltage. The pressure contact means, the ferromagnetic material, and the coil and both facing parts are relatively movable along the longitudinal direction of these facing parts.

Therefore, when a voltage is applied to the coil to generate a magnetic force line, the magnetic force line causes a spiral current to flow in the ferromagnetic body, and the electric resistance at this time causes the ferromagnetic body to generate heat. Then, by this ferromagnet,
Both facing parts of both film materials facing the ferromagnetic material are heated and melted. Next, the pressure contact means, the ferromagnetic material, and the coil are moved relative to each other, and the melted portions of the two face-to-face parts are pressure-contacted to each other by the pressure-contact means, so that the two face-to-face parts are welded to each other. It will be.

Since both facing portions of the film materials are directly heated by the heat of the ferromagnetic material, they can be welded to each other regardless of the material of the film. The degree of freedom of welding is improved and the workability is improved.

Further, when the pressure contact means, the ferromagnetic material, and the coil and the both facing portions are relatively continuously moved along the longitudinal direction of these facing portions, both the sandwiching members of the ferromagnetic material are sandwiched. With the movement, the facing portions are sequentially heated and melted by the same ferromagnetic material, and the facing portions are sequentially pressure-welded to weld the facing portions.

For this reason, firstly, for the welding of both facing parts,
Since hot air is not used, smoke generation due to heating is suppressed.

Secondly, as described above, the pressure contact means,
If the ferromagnetic material and the coil are relatively continuously moved along the longitudinal direction of both facing portions, both facing portions sandwiching the ferromagnetic material are sequentially heated and melted by the ferromagnetic material, and Since this is sequentially pressed and welded by the pressing means, this welding is continuously performed, and the above-mentioned welding work is performed smoothly and quickly.

Further, thirdly, for example, if the power supplied to the coil is increased, the temperature of the ferromagnetic material can be increased by that much. Therefore, even if the ferromagnetic material is made small, Both facing parts can be sufficiently heated by the ferromagnetic material. Therefore, since the ferromagnetic material can be made smaller, the insertion of the ferromagnetic material between the facing portions becomes easier.

Further, since the ferromagnetic material can be made small as described above, the expansion of both facing portions due to the insertion of the ferromagnetic material can be suppressed to be small. Therefore, since the amount of bending of the facing portion from the state of being expanded by the ferromagnetic material to being pressed into contact with each other by the pressure contact portion is small, the relative movement between the facing surface portion and the ferromagnetic material is correspondingly reduced. It will be smoother.

From the above-mentioned first to third points,
The workability of welding both facing parts of both film materials is dramatically improved.

In the above case, the ferromagnetic body may be a flat plate-like body extending between the facing portions of both film materials.

By doing so, it becomes easier to insert the ferromagnetic material between the facing portions of the film materials, and the workability is improved.

When the ferromagnetic material is relatively moved along the longitudinal direction of both facing parts sandwiching the ferromagnetic material, since the ferromagnetic material is flat, the facing parts are expanded by inserting the ferromagnetic material. Is extremely small. Therefore, since the amount of bending from the state where the facing portion is expanded by the ferromagnetic material until the pressure contact portion is brought into pressure contact with each other is extremely suppressed, the relative movement between the both facing portions and the ferromagnetic material is prevented. Further, it becomes smoother and the workability of welding is improved.

A pressing means for pressing the facing portion facing the ferromagnetic material against the ferromagnetic material may be provided.

In this way, the facing portions are pressed against the ferromagnetic material by the pressing means, so that the efficiency of heat transfer between the facing surfaces and the ferromagnetic material is improved, and the ferromagnetic material Heating by the body becomes more effective. For this reason,
It is possible to prevent the coil from unnecessarily consuming electric power, and to reliably weld the facing portions. Therefore, the ferromagnetic material can be made smaller and flatter by that amount.

Further, the pressure contact means, the ferromagnetic material, the coil, and the support for supporting them are integrated to form an assembly, and the assembly and both facing parts are arranged along the longitudinal direction of these facing parts. It may be relatively movable.

By doing so, the pressure contact means, the ferromagnetic material,
And the relative position of the press contact portion is made constant by the support. Therefore, in particular, it is possible to weld the both facing parts by moving only the assembly while keeping the facing parts stationary. That is, if the welding machine is configured as described above,
Since the welding machine can be carried around, the welding machine with this configuration can be used for on-site work, and thus the flexibility of applicability is improved and the workability is improved.

[Brief description of drawings]

FIG. 1 is a side view of a welding machine.

FIG. 2 is a plan view of the welding machine.

FIG. 3 is a rear view of the welding machine.

[Explanation of Codes] 1 Membrane material 2 Membrane material 3 Face-to-face portion 4 Face-to-face portion 6 Welding machine 7 Membrane body 9 Welding machine main body 10 Support 12 Support plate (ferromagnetic material) 14 Pressure contact means 23 Gap 24 Pressure contact section 25 Coil 25a Magnetic field line 25b eddy current 32 pressing means 36 assembly

Claims (4)

[Claims] 1. A pressure contact means for enabling pressure contact between two opposing surface portions of a thermoplastic resin film material to be overlapped with each other, and the same two opposing surface portions displaced from the pressure contact portion in the vicinity of the pressure contact portion by the pressure contact means. A ferromagnetic material that can be inserted and removed freely is provided between the two, and a coil that generates a magnetic force line when a voltage is applied is provided. A membrane material welding machine made of a thermoplastic resin, in which the means, the ferromagnetic material, and the coil and both facing parts are relatively movable along the longitudinal direction of these facing parts. 2. The film material welding machine made of a thermoplastic resin according to claim 1, wherein the ferromagnetic material is a flat plate-like body extending along both facing portions of both film materials. 3. The thermoplastic resin film material welding machine according to claim 1 or 2, further comprising a pressing means for pressing the facing portion facing the ferromagnetic material against the ferromagnetic material. 4. An assembly is constructed by integrating a pressure contact means, a ferromagnetic material, a coil, and a support for supporting them.
The thermoplastic resin membrane material welding machine according to any one of claims 1 to 3, wherein the assembly and both facing parts are relatively movable along the longitudinal direction of these facing parts.