JP5093491B2 - Welding apparatus and welding method for thermoplastic material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To weld even a plastic plate containing void inside such as a foam plastic plate or a cardboard plastic plate at a low cost with excellent working efficiency while the appearance after welding is satisfactorily kept. <P>SOLUTION: A welding apparatus includes: a heater unit 2 arranged between a plurality of the thermoplastic materials P1, P2 to be welded to each other and heating the plurality of the thermoplastic materials P1, P2 in a non-contact manner by radiant heat; and a lower suction table 30 and an upper suction table 40 which hold the plurality of the thermoplastic materials P1, P2 in a state that they face each other when being heated by the heater unit 2 and in which after heating by the heater unit 2, the plurality of the thermoplastic materials P1, P2 are welded to each other with pressure. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a welding apparatus and a welding method for a thermoplastic material for joining thermoplastic materials formed of plastic having thermoplasticity by welding.

  Conventionally, as a method of welding plastic materials such as foamed plastic plate material and corrugated plastic plate material formed of thermoplastic plastic, ultrasonic welding method, vibration welding method, hot air welding method or welding method by inserting a heater plate Etc. are known.

  In the ultrasonic welding method, two plastic plate materials are stacked and placed on a fixed base, and an ultrasonic vibrator (horn) is strongly pressed against the upper plastic plate material to apply ultrasonic longitudinal waves. In this way, ultrasonic waves are transmitted through the upper plastic plate material, and the ultrasonic vibration energy turns into thermal energy at the boundary surface with the lower plastic plate material to melt the boundary surface and weld them together.

  In the vibration welding method, two plastic plates are stacked and placed on a fixed base that has been subjected to anti-slip processing in advance, and the surface of the upper plastic plate is also pressed against the anti-slip acoustic wave vibrator in the lateral direction. By vibrating at the sonic frequency, frictional heat is generated at the boundary surface of the plastic plate material, and the boundary surface is melted to weld both.

  In the hot air welding method, the surfaces to be welded of the two plastic plates to be welded are melted simultaneously with hot air and pressed against each other to weld them together. In addition, in the welding method by inserting the heater plate, the heater plate is sandwiched between the two plastic plate materials to be welded, the temperature of the heater plate is raised, the two are melted, the heater plate is pulled out, and the plastic plate materials are attached to each other. The two are pressed and welded together (see, for example, Patent Document 1).

JP-A-6-1344

  When welding plastic plates with voids inside, such as foam plastic plates and corrugated cardboard plastic plates, the ultrasonic welding method attenuates the ultrasonic waves in the plastic plate on the side where the horn is applied and turns it into heat. Therefore, there is a problem that the horn melts the plastic plate material and gets into the inside. A thin layer of molten plastic is generated under the recessed horn, but this molten plastic layer is welded in a state where it is sufficiently inserted into the other plastic plate, and it is possible to weld while maintaining the properties of the plastic plate. Can not.

  In the vibration welding method, it is possible to weld while maintaining the properties of foamed plastic board or corrugated plastic board, but since the sound wave generator emits a loud sound when it vibrates, it requires soundproofing equipment, There is a problem that the cost is high as well as lack of properties.

  In the hot air welding method, since a large amount of air is heated and the surface of the plastic plate material is melted by forced convection, there is a lot of waste of heat energy, and it is difficult to accurately control the molten state of the surface of the plastic plate material. In the welding method by inserting the heater plate, when the heater plate is pulled out after the plastic plate material is melted, the melted plastic jumps out with the heater plate between the two plastic plate materials. There is a problem that the appearance afterwards becomes worse.

  Therefore, in the present invention, even a plastic plate material including a void inside such as a foamed plastic plate material or a corrugated cardboard plastic plate, there is little waste of heat energy, low cost, good workability, and good appearance after welding. It aims at providing the welding apparatus and welding method of the thermoplastic material which can be welded, keeping it at.

  The thermoplastic material welding apparatus of the present invention is disposed between a plurality of thermoplastic materials that are welded to each other, and a heater that heats the plurality of thermoplastic materials in a non-contact manner by radiant heat, and a plurality of heaters when heated by the heater. The thermoplastic plastic material is held in a state of facing each other, and a holding device that presses the plurality of thermoplastic plastic materials together after being heated by the heater is provided.

  The thermoplastic material welding method of the present invention holds a plurality of thermoplastic materials that are welded to each other in a state of facing each other, and a plurality of them are radiated by a heater disposed between the plurality of thermoplastic materials. Heating the thermoplastic material in a non-contact manner to melt the surfaces of the plurality of thermoplastic materials, and pressing the plurality of thermoplastic materials after the surfaces of the thermoplastic materials are melted.

  According to these inventions, the plurality of thermoplastic materials are heated in a non-contact manner by the radiant heat of the heaters disposed between the plurality of thermoplastic materials that are welded together, and the surfaces of the plurality of thermoplastic materials are Melts simultaneously in a short time. A plurality of thermoplastic plastic materials whose surfaces are melted are pressed together, so that the thermoplastic plastic materials are welded together.

  Here, the heater is capable of advancing and retreating between the thermoplastic plastic materials held by the holding device, and is heated while being advanced between the plurality of thermoplastic plastic materials, so that the plurality of thermoplastic plastics is heated. When the materials are pressed together, it is desirable that they be retracted from between a plurality of thermoplastic materials.

  Accordingly, the surface of the thermoplastic material before welding can be melted by moving the heater side without moving the thermoplastic material, so that the alignment of the thermoplastic material is facilitated. In addition, since it is possible to prevent positional displacement after welding, it is possible to perform welding with high accuracy.

  In addition, the heater is preferably provided with a mask that limits the range to which the radiant heat is irradiated. Since the radiant heat from the heater is emitted in all directions, it is possible to melt and weld only a desired portion of the surface of the thermoplastic material by limiting the range in which the radiant heat is irradiated by the mask.

  The holding device is preferably a device that adsorbs and holds a thermoplastic material on a flat plate by suction of air. By adsorbing and holding on the flat plate by sucking air, the thermoplastic material can be prevented from being deformed regardless of the thermal expansion of the thermoplastic material, and highly accurate welding can be performed.

  Moreover, it is desirable that the flat plate for sucking the thermoplastic material of the holding device is provided with a temperature sensor. This makes it possible to detect the heating state of the thermoplastic material and optimally control the welding.

  The heater is preferably a metal belt-shaped electric heater that generates heat when energized and is held by a predetermined tensile force applied by an elastic body. This makes it possible to easily control the temporal change in heating, and even if the electric heater expands and deforms due to heating, it is pulled by the elastic body and its straight state is maintained, so there is no error. It becomes possible to maintain radiant heat radiation.

  Moreover, it is desirable that the electric heater is configured to supply a gas that prevents oxidation, such as nitrogen or carbon dioxide. Thereby, deterioration due to oxidation of the electric heater that has become high temperature due to heat generation can be suppressed, and the life of the electric heater can be extended.

(1) A plurality of thermoplastic materials that are welded to each other are held facing each other, and the plurality of thermoplastic materials are heated in a non-contact manner by the radiant heat of a heater disposed between the plurality of thermoplastic materials. After the surfaces of a plurality of thermoplastic materials are melted and the surfaces of the thermoplastic materials are melted, the plurality of thermoplastic materials are pressed against each other. Since there is no contact at all, the melting point will not be deformed, and the surface of multiple thermoplastic materials can be melted simultaneously in a short time by radiant heat, so there is little waste of energy and work at low cost It becomes possible to perform welding while maintaining good appearance and good appearance after welding.

(2) The heater is capable of advancing and retreating between the thermoplastic materials held by the holding device, and is heated while being advanced between the plurality of thermoplastic materials, and the plurality of thermoplastic plastics. When the materials are pressed against each other, the surface of the thermoplastic material before welding is melted away from the plurality of thermoplastic materials, so that the heater side can be moved without moving the thermoplastic material. Since it can be carried out, the alignment of the thermoplastic material is facilitated, and high-precision welding can be performed.

(3) Since the heater is provided with a mask that limits the range in which the radiant heat is irradiated, the radiant heat from the heater is emitted in all directions, but the range in which the radiant heat is irradiated by the mask is limited. Thus, only a desired portion of the surface of the thermoplastic material can be melted and welded. As a result, unnecessary portions of the surfaces of the thermoplastic materials that are desired to be welded to each other are not melted, and the appearance after welding can be improved.

(4) Since the holding device adsorbs and holds the thermoplastic material on the flat plate by sucking air, it can prevent deformation of the thermoplastic material regardless of the heating state of the thermoplastic material. It is possible to perform welding with high accuracy.

(5) Since the heater is an electric heater that generates heat when energized, it is possible to accurately control changes in heating time, and it is possible to optimally heat depending on the state of the thermoplastic material to be welded. It becomes.

(6) Since the heater is a metal belt-like plate that is held by a predetermined tensile force applied by an elastic body, the area of the surface that radiates heat is larger than that of a linear heater at the same temperature, It can generate so much radiant heat. Also, even if the belt-like plate is deformed by heating, it is pulled by the elastic body and its straight state is maintained, so that it is possible to maintain radiant heat radiation without any deviation and to perform highly accurate welding. Become.

  1 is a block diagram showing a schematic configuration of a thermoplastic material welding apparatus according to an embodiment of the present invention, FIG. 2 is a schematic sectional view of a thermoplastic material welding apparatus according to an embodiment of the present invention, and FIG. FIG. 3 is a diagram showing details of the heater unit of the welding apparatus of FIG. 2, wherein (a) is a top view showing a state in which the upper irradiation mask is removed, and (b) is a top view showing a state in which the upper irradiation mask is attached. c) It is AA sectional drawing of (a).

  As shown in FIG. 1, a thermoplastic material welding apparatus 1 according to an embodiment of the present invention is a heater unit 2 for heating a welding surface of a thermoplastic material (hereinafter referred to as “plastic material”). A heater advancing / retracting mechanism 3 for advancing and retracting the heater unit 2 with respect to the welding surface of the plastic material, a holding device 4 for holding the two plastic materials welded to each other, and a holding device for holding the plastic agent by suction of air Operation of the welding apparatus 1, a suction apparatus 5 for adsorbing on the sheet 4, a guide apparatus 6 for guiding and positioning plastic materials to be welded to each other, various sensors 7 for detecting temperature, position, voltage, current, etc. A display / operation panel 8 for displaying and operating the state, a recording device 9 for recording the state of the welding device 1, and a control device for controlling each part of the welding device 1 It consists of 10 Metropolitan.

The heater unit 2 is disposed between two plastic materials P ₁ and P ₂ (see FIG. 4F) that are welded to each other, and heats these two plastic materials P ₁ and P ₂ in a non-contact manner by radiant heat. It is. As shown in FIG. 2, the heater unit 2 is mainly an electric heater device 11 that generates heat when energized, and a case that houses the electric heater device 11, and limits the range to which the radiant heat of the electric heater device 11 is irradiated. A case and mask 12 having a mask function, a power supply device (not shown) for energizing the electric heater device 11 to generate heat, and a nitrogen supply pipe 25.

  As shown in FIG. 3, the case and mask 12 is composed of a lower irradiation mask 12a and an upper irradiation mask 12b. The lower irradiation mask 12a and the upper irradiation mask 12b are provided with openings 13a and 13b for limiting the irradiation range, respectively.

  As shown in FIG. 3, the electric heater device 11 includes a heater plate 14 that is a straight strip plate made of metal, a heater plate fixing bracket 15 for a fixed electrode fixed to one end of the heater plate 14, and a heater plate 14. Slide electrode heater plate fixing bracket 16 fixed to the other end, fixed electrode 17 fixed to the lower irradiation mask 12a and fixed electrode heater plate fixing bracket 15 and slide electrode heater plate fixing bracket 16 The slide electrode 18 is fixed to the slide electrode 18, one end is connected to the slide electrode 18, the pulling spring 19 is an elastic body that holds the slide electrode 18 by applying a predetermined tensile force, and the lower irradiation mask 12 a is fixed and pulled. A fixed electrode 20 to which the other end of the spring 19 is connected; a multi-core lead wire 21 that electrically connects the slide electrode 18 and the fixed electrode 20; Source device and composed of power cables 22, 23 for electrically connecting.

  In the electric heater device 11 having this configuration, one of the electric power supplied from the power supply device is through the power cable 22, the fixed electrode 17 and the fixed electrode heater plate fixing bracket 15, and the other is the power cable 23, the fixed electrode 20, and the multicore. The heater plate 14 is energized through the lead wire 21, the slide electrode 18 and the heater plate fixing bracket 16 for the slide electrode. Here, when the heater plate 14 is a stainless steel plate having a length of about 30 cm and a width of about 1 to 2 cm and a thickness of about 0.1 mm, when a current of 20 to 40 A is applied via a step-down transformer of about several volts of output. The heater plate 14 emits yellow light and emits intense radiant heat. At this time, the heater plate 14 is extended by the temperature rise, but since the predetermined tension force is applied and held by the pulling spring 19, the slide electrode 18 slides (moves) away from the fixed electrode 17, and is straight. Maintained in a state.

  The nitrogen supply pipe 25 supplies nitrogen gas into the case and mask 12 as a gas that prevents oxidation of the heater. The supplied nitrogen gas is slowly supplied downward from the slit-shaped nitrogen outlet 26 formed in the nitrogen supply pipe 25 toward the lower side of the heater plate 14. The nitrogen gas supplied to the lower side of the heater plate 14 slowly covers the heater plate 14 with the rising airflow due to the heat of the heater plate 14 and suppresses the oxidation of the heater plate 14. Thereby, the lifetime of the heater plate 14 can be extended. In addition, it is also possible to use other antioxidant gas, such as a carbon dioxide gas, instead of nitrogen gas.

Returning to FIG. 1, the heater advance / retreat mechanism 3 advances and retracts the heater unit 2 between the plastic materials P ₁ and P ₂ held by the holding device 4. Heater reciprocating mechanism 3, at the time of heating the heater unit 2 and a state of being advanced between the two plastic materials P _1, P _2, at the time of press-contact so as to be brought into retracted from between the two plastic materials P _1, P ₂ .

The holding device 4 includes a lower suction stand 30 disposed on the lower side and an upper suction stand 40 disposed on the upper side. The lower suction table 30 is a hollow box whose upper surface is formed by a flat plate 32 provided with a large number of apertures 31, and includes a suction port 33 to which the suction device 5 is connected. On the other hand, the upper suction table 40 is a hollow box having a lower surface formed by a flat plate 42 provided with a large number of openings 41, and includes a suction port 43 to which the suction device 5 is connected. The flat plates 32 and 42 are provided with a temperature sensor (not shown) such as a thermistor for measuring the temperature of the plastic materials P ₁ and P ₂ to be held.

The suction device 5 sucks air from the suction ports 33 and 43 of the lower suction table 30 and the upper suction table 40 to generate a negative pressure in the respective openings 31 and 41, and the plastic material P is generated by this negative pressure. ₁ and P ₂ are adsorbed on the upper surface of the flat plate 32 of the lower adsorption table 30 and the lower surface of the flat plate 42 of the upper adsorption table 40, respectively.

The guide device 6 includes a lower guide 60 for positioning the plastic material P ₁ held by the lower suction table 30 and an upper guide 61 for positioning the plastic material P ₂ held by the upper suction table 40. Is done.

  Next, the operation of the plastic material welding apparatus 1 having the above-described configuration will be described with reference to FIGS. 4A to 4J are explanatory views showing a welding process by the welding apparatus 1 of FIG.

First, as shown in FIG. 4A, the lower guide 60 of the guide device 6 is disposed at the tip of the lower suction table 30, and the upper guide 61 is disposed above the lower guide 60. At this time, the tip portion 60a of the lower guide 60 is disposed so as to protrude above the upper surface of the lower suction table 30, the plastic material P ₁ as shown in Figure 4B, the tip end portion of the lower guide 60 Positioning is performed by being abutted against 60a. Further, the tip of the upper guide 61 is formed a stopper portion 61a is, plastic material P ₂ as shown in Figure 4B, is positioned by its distal end is abutted to the stopper portion 61a on the upper guide 61 It has become so. Further, the position of the upper guide 61 is such that the plastic material P ₁ disposed on the lower suction table 30 and the plastic material P ₂ disposed on the upper guide 61 overlap each other by the amount of welding allowance. Be placed.

Next, as shown in FIG. 4B, the two plastic materials P ₁ and P ₂ are arranged on the lower suction table 30 and the upper guide 61, respectively. At this time, the plastic material P ₂ is abutted against the stopper portion 61 a on the upper guide 61 so that the tip of the plastic material P ₁ is abutted against the tip portion 60 a of the lower guide 60 as described above. Arranged so that. Then, as shown in FIG. 4C, the upper suction table 40 is arranged on the plastic material P ₂ arranged on the upper guide 61, and as shown in FIG. 4D, the lower suction table 30 and the upper suction table are arranged by the suction device 5. Air is sucked from the suction ports 33 and 43 of the table 40, and the plastic materials P ₁ and P ₂ are adsorbed to the upper surface of the flat plate 32 of the lower adsorption table 30 and the lower surface of the flat plate 42 of the upper adsorption table 40, respectively.

Next, the lower guide 60 and the upper guide 61 are retracted as shown in FIG. 4E, and the heater unit 2 is advanced between the plastic materials P ₁ and P ₂ as shown in FIG. 4F. Then, the electric heater device 11 is energized, and the plastic materials P ₁ and P ₂ are heated by, for example, about 5 seconds by the radiant heat generated from the heater plate 14. At this time, the heater plate 14 extends by a temperature rise, because it is held is applied a predetermined tension by the tension spring 19 is maintained in a straight state, between the plastic material P _1, P ₂ of the upper and lower The distance is kept constant.

Thereafter, the heater unit 2 is retracted from between the plastic materials P ₁ and P ₂ , and as shown in FIG. 4G, the upper suction table 40 is lowered and pressed. At this time, by adjusting the height of the lower guide 60 and lowering the upper suction stand 40 to a position where it comes into contact with the lower guide 60, the penetration depth between the plastic materials P ₁ and P ₂ is set. be able to.

Then, as shown in FIG. 4H, the doors 34 and 44 at the front ends of the lower suction table 30 and the upper suction table 40 are released, and the outside air is passed through the lower suction table 30 and the upper suction table 40, The welded portions of the plastic materials P ₁ and P ₂ are cooled. The welding is completed when the welded portions of the plastic materials P ₁ and P ₂ are cooled and solidified. Next, as shown in FIG. 4I, suction of air from the suction ports 33 and 43 of the lower suction table 30 and the upper suction table 40 by the suction device 5 is stopped, and the upper suction table 40 is removed. Finally, the welded plastic materials P ₁ and P ₂ are removed as shown in FIG. 4J.

As described above, in the welding apparatus 1 according to this embodiment, the plastic materials P ₁ and P ₂ are not in contact with each other by the radiant heat of the heater plate 14 disposed between the _two plastic materials P ₁ and P ₂ to be welded to each other. The surfaces of these plastic materials P ₁ and P ₂ are simultaneously melted in a short time. Then, the plastic materials P ₁ and P ₂ whose surfaces are melted are pressed together, so that the plastic materials P ₁ and P ₂ are welded together and firmly bonded.

As described above, in the welding apparatus 1 according to the present embodiment, when the plastic materials P ₁ and P ₂ are heated, nothing is brought into contact with the heating surface, so that the melted portion is not deformed by an external force, and is also generated by radiant heat. Since the surfaces of the _two plastic materials P ₁ and P ₂ can be melted simultaneously in a short time, the energy is not wasted, the work cost is low, the workability is good, and the appearance after welding is kept good. Is possible.

Further, in the welding apparatus 1 in the present embodiment, the surface of the plastic materials P ₁ and P ₂ to be welded is moved by moving the heater unit 2 side without moving the plastic materials P ₁ and P _2. The alignment is completed only by aligning the materials P ₁ and P ₂ before melting. Moreover, since position shift after welding can be prevented, highly accurate welding can be performed.

Further, in the welding apparatus 1 according to the present embodiment, the radiant heat from the heater plate 14 of the heater unit 2 is emitted in all directions, but the range to which the radiant heat is irradiated is limited by the case and mask 12, so the plastic material P It is possible to melt and weld only desired portions of the surface of ₁ and P ₂ . Thereby, unnecessary portions on the surfaces of the plastic materials P ₁ and P ₂ to be welded to each other are not melted, and the appearance after welding can be improved.

Further, in the welding apparatus 1 according to the present embodiment, the holding device 4 always holds the plastic materials P ₁ and P ₂ by adsorbing them to the lower suction table 30 and the flat plates 32 and 42 of the upper suction table 40 by air suction. The plastic materials P ₁ and P ₂ are prevented from being deformed regardless of the heating state of the plastic materials P ₁ and P ₂ . Therefore, deformation due to thermal expansion during heating of the plastic materials P ₁ and P ₂ can be prevented, and high-precision welding can be performed.

Moreover, in the welding apparatus 1 in this embodiment, since the heater plate 14 is an electric heater that generates heat when energized, it is possible to accurately control the time change of the heating of the heater plate 14, and the plastic material P _1. , P ₂ can be optimally heated according to the state of P ₂ .

Further, in the welding apparatus 1 according to the present embodiment, the heater plate 14 is held by being applied with a predetermined tensile force by the pull spring 19, so that even if the heater plate 14 is deformed by heating, the heater plate 14 is pulled by the pull spring 19. The straight state is maintained. Thereby, since the distance between the upper and lower plastic materials P ₁ and P ₂ is kept constant, it is possible to maintain radiant heat radiation without any deviation, and it is possible to perform highly accurate welding.

As described above, in the welding apparatus 1 according to the present embodiment, positioning is easy, and it is easy to control welding conditions such as the intensity of radiant heat, the heating time, and the heating range. Yes. For example, if the plastic materials P ₁ and P ₂ are set and removed for 8 seconds, the heating time is 5 seconds, and the cooling time is 7 seconds, 20 seconds is required for one welding operation. Compared with about 1 minute or more of one welding operation in the welding method, the required time is 1/3 or less. The welding apparatus 1 is assumed to be manual for setting and removing the plastic materials P ₁ and P ₂ , but since it is easy to automate by machine from the start of welding to cooling, one worker has automated two at the same time. The workability can be further improved by alternately working with the welding apparatus 1.

  In the conventional hot-air welding method, it is normal to operate a 1 kW heat gun for about 1 minute (60 seconds) in one welding operation, and consumes 60 kJ of energy. On the other hand, in the welding apparatus 1 according to this embodiment, for example, in the case of energization for 10 V, 40 A, and 5 seconds, the energy required for heating is only 400 W × 5 s = 2 kJ. If one welding operation takes 20 seconds and the power of various devices other than heating is 500 W on average, the energy of various devices used in one welding operation is 10 kJ, so the energy required for one welding is The total is 12 kJ. This is only 1/5 of the energy of the conventional hot air welding method. Thus, the welding apparatus 1 in this embodiment is also effective in saving energy.

  INDUSTRIAL APPLICABILITY The present invention is useful as a welding apparatus and a welding method for a thermoplastic material that joins thermoplastic materials formed of thermoplastic plastic such as polypropylene by welding. In particular, the present invention is suitable for manufacturing plastic containers and instruments as welded materials by joining together plastic materials including voids such as foamed plastic plate materials and corrugated cardboard plastic plates. Yes.

It is a block diagram which shows schematic structure of the welding apparatus of the thermoplastic material in embodiment of this invention. It is a schematic sectional drawing of the welding apparatus of the thermoplastic material in embodiment of this invention. FIG. 3 is a diagram showing details of the heater unit of the welding apparatus of FIG. 2, wherein (a) is a top view showing a state in which the upper irradiation mask is removed, and (b) is a top view showing a state in which the upper irradiation mask is attached. c) It is AA sectional drawing of (a). It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG. It is explanatory drawing which shows the welding process by the welding apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Welding device 2 Heater unit 3 Heater advance / retreat mechanism 4 Holding device 5 Suction device 6 Guide device 7 Various sensors 8 Display operation panel 9 Recording device 10 Control device 11 Electric heater device 12 Case and mask 12a Lower irradiation mask 12b Upper irradiation mask 13a, 13b Opening 14 Heater plate 15 Heater plate fixing bracket for fixed electrode 16 Heater plate fixing bracket for slide electrode 17 Fixed electrode 18 Slide electrode 19 Pulling spring 20 Fixed electrode 21 Multi-core lead wire 22, 23 Power supply cable 25 Nitrogen supply pipe 26 Nitrogen Outlet 30 Lower suction stand 31 Open hole 32 Flat plate 33 Suction port 40 Upper suction stand 41 Open hole 42 Flat plate 43 Suction port 60 Lower guide 60a Tip 61 Upper guide 61a Stopper

Claims (7)

A heater that is disposed between a plurality of thermoplastic materials that are welded to each other and that heats the plurality of thermoplastic materials in a non-contact manner by radiant heat, generates heat when energized, and a predetermined tensile force is applied by an elastic body. An electric heater of a metal strip that is held ;
Holds in a state in which said facing a plurality of thermoplastic material when heated by the electric heater, the rear heating by the electric heater, the thermoplastic material and a holding device for pressing said plurality of thermoplastic materials to each other Welding equipment. The electric heater is capable of advancing and retreating between the thermoplastic materials held by the holding device, heating the plurality of thermoplastic materials while being advanced between the plurality of thermoplastic materials, 2. The thermoplastic plastic material welding apparatus according to claim 1, wherein the thermoplastic plastic material is retracted from between the plurality of thermoplastic plastic materials when pressed.   The thermoplastic resin welding apparatus according to claim 1 or 2, wherein the holding device is configured to adsorb and hold the thermoplastic material on a flat plate by suction of air. A heater that holds a plurality of thermoplastic materials that are welded to each other in a face-to-face relationship and that is placed between these thermoplastic materials, generates heat when energized, and a predetermined tensile force is applied by an elastic body. Heating the plurality of thermoplastic materials in a non-contact manner by radiant heat of an electric heater of a metal strip plate held in a molten state, and melting the surfaces of the plurality of thermoplastic materials;
A method for welding a thermoplastic material, comprising pressing the plurality of thermoplastic materials after the surface of the thermoplastic material is melted. The heating by the electric heater is performed in a state where the electric heater is advanced between the plurality of thermoplastic materials,
5. The method of welding a thermoplastic material according to claim 4 , wherein the electric heater is retracted from between the plurality of thermoplastic materials when the plurality of thermoplastic materials are pressed together. The method of welding a thermoplastic material according to claim 4 or 5 , wherein the heating by the electric heater is performed by limiting a range irradiated with the radiant heat with a mask. The method for welding thermoplastic materials according to any one of claims 4 to 6 , wherein the holding of the plurality of thermoplastic materials is performed by sucking air on a flat plate.

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