CN111376488A - Welding device and welding method for PP thin sheet and PP foaming plate - Google Patents
Welding device and welding method for PP thin sheet and PP foaming plate Download PDFInfo
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- CN111376488A CN111376488A CN201910134413.1A CN201910134413A CN111376488A CN 111376488 A CN111376488 A CN 111376488A CN 201910134413 A CN201910134413 A CN 201910134413A CN 111376488 A CN111376488 A CN 111376488A
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- plate
- sheet
- main machine
- heating wire
- insulating strip
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
- B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
- B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
- B29C65/223—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire comprising several heated wires
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/003—Protecting areas of the parts to be joined from overheating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
- B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
- B29C66/12221—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment the two joint-segments being lapped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a fusion welding device of a PP sheet and a PP foaming plate, which comprises a main machine seat, wherein a hydraulic transmission device and a water tank are arranged in the main machine seat, a supporting plate is arranged at the top end of the main machine seat, two transmission arms symmetrically distributed on two sides of the supporting plate are arranged on the supporting plate, and a pressing plate is arranged on each transmission arm; be equipped with the stull slat that the symmetry set up in the backup pad between the both sides transmission arm, the welding has the stull slat on the stull slat, the stull slat upper end is fixed with the backing plate, be fixed with insulating bar piece and gib block on the backing plate, the gib block is located insulating bar piece inboard, insulating bar piece and gib block are equipped with the gap, the gib block inboard is equipped with the locating piece, be equipped with the apron on the insulating bar piece, be equipped with the heater strip on the inboard insulating bar piece of apron, the cladding is being gone up to the heater strip heat transfer film, be equipped with the rivers passageway on. The method of the welding device has the advantages of high efficiency, firmness, attractive appearance, strong tension, low cost, high yield and the like.
Description
Technical Field
The invention relates to a welding device and a welding method, in particular to a welding device and a welding method for a PP sheet and a PP foaming plate.
Background
The PP thin sheet and the PP foaming plate are connected by adopting a hot-pressing bonding method or a sewing method of a sewing machine in the current market. 1. Products such as a hot pressing method and a hot pressing method are not firm, poor in tension and easy to fall off, defective products are easy to generate, and risks such as complaints and goods returns of users are increased. 2. The sewing machine stitching method has the disadvantages of slow production efficiency, unattractive product, low yield, and high production cost, and the development of a welding device and a welding method for a PP sheet and a PP foaming plate is a problem to be solved by the technical staff in the field.
Disclosure of Invention
The invention provides a welding device and a welding method for a PP sheet and a PP foaming plate to solve the defects.
The above object of the present invention is achieved by the following technical means: a welding device for a PP sheet and a PP foaming plate comprises a main machine seat, a supporting plate, a transmission arm, a pressing plate, a cross brace batten, a vertical brace batten, a base plate, an insulating strip block, a guide strip, a cover plate, a gap, a positioning block, a water pipe, a locking plate, the PP sheet and the PP foaming plate;
the main machine seat is internally provided with a hydraulic transmission device and a water tank, the supporting plate is arranged at the top end of the main machine seat, the supporting plate is provided with two transmission arms symmetrically distributed on two sides of the supporting plate, the transmission arms are provided with pressing plates, and the pressing plates are in transmission connection with the hydraulic transmission device to realize up-and-down sliding; the support plate between the two side driving arms is provided with symmetrically arranged cross brace strips, the cross brace strips are welded with vertical brace strips, the upper ends of the vertical brace strips are fixed with backing plates, the backing plates are fixed with insulating strip blocks and guide strips, the guide strips are positioned at the inner sides of the insulating strip blocks, the insulating strip blocks and the guide strips are provided with gaps, the inner sides of the guide strips are provided with positioning blocks, the insulating strip blocks are provided with cover plates,
the base plate, the insulating strip block and the cover plate are locked on the vertical stay plate through screws; the guide strip is locked on the base plate through a screw; a heating wire is arranged at the upper end of the insulating strip block on the inner side of the cover plate, a heat-conducting film is coated on the heating wire, two ends of the heating wire are pressed in the insulating strip block, the insulating strip block is connected with screws to lock two ends of the heating wire, and then the heating wire is connected with a power supply arranged in the main machine base to be electrified and heated; the heat conducting thin film is wrapped by the heating wire, so that the PP thin film is prevented from being burnt and damaged due to overhigh temperature, the heating wire is also prevented from contacting air and is easy to oxidize after being heated, the service life of the heating wire is prolonged, the heat conducting thin film has good heat conductivity coefficient, the heat of the heating wire can be well conducted to melt the PP thin film which is processed, and the PP thin film and the PP foaming plate are better fused together;
meanwhile, water flow channels are arranged on the insulating strip blocks, and the water flow channels on the insulating strip blocks on the two sides are communicated through water pipes and are connected with a water pump arranged in a water tank through the water pipes; the water in a water pump in the main machine seat is pumped into a water flow channel in the insulating bar block through a water pipe to circulate, and then flows back to the water tank in the main machine seat through the water pipe, so that the heat conducted to the insulating bar block by the heating wire in the heating process is reduced by repeatedly circulating and circulating, and the PP sheet processed by the insulating bar block is not damaged due to overhigh temperature;
the positioning block can slide out a distance suitable for processing the PP thin sheet and the PP foaming plate on a sliding rail arranged on the inner side of the guide strip according to the sizes of the PP thin sheet and the PP foaming plate.
A welding method of a PP sheet and a PP foaming plate comprises the following steps:
(1) inserting a PP sheet to be processed around a gap between the guide strip and the insulating strip block on two sides of the welding device, and turning the upper end of the PP sheet outwards and flatly paving the PP sheet on the heat-conducting film;
(2) covering a PP foaming plate on a PP sheet which is turned outwards and laid on a heat conducting film, controlling pressing plates on transmission arms at two sides to press down and tightly press the PP foaming plate and the PP sheet through a hydraulic transmission device in a main machine seat, enabling the PP foaming plate and the PP sheet to be in tight contact, electrifying a power supply in the main machine seat to heat a heating wire, conducting heat by the heat conducting film to melt and scald the PP sheet, and welding two sides of the PP sheet and the PP foaming plate together;
(3) and when the two sides of the PP sheet are welded with the PP foaming plate, the pressing plates on the transmission arms at the two sides are controlled to rise simultaneously by the hydraulic transmission device in the main machine seat, and finally, the finished product is taken out.
The heat conducting film on the insulating strip block is made of a material which is high temperature resistant and has a good heat conducting coefficient, the heat conducting film is wrapped by the heating wire, the heating wire is prevented from directly contacting with the processed PP thin sheet, the PP thin sheet is damaged due to overhigh temperature, the heating wire is also prevented from contacting with air and is easy to oxidize after being heated, the service life of the heating wire is prolonged, the heat conducting film has a good heat conducting coefficient, the heat of the heating wire can be well conducted to the processed PP thin sheet, the PP thin sheet and the PP foaming plate are better fused together, a water flow channel is arranged in the insulating strip block, two ends of the water flow channel are respectively connected with a water pump in the main machine seat through a water pipe and are led into a water tank arranged in the main machine seat, the water in the water tank in the main machine seat is pumped by the water pump in the main machine seat, the water is injected into the water flow channel in the insulating strip block through the water pipe, the processed PP thin sheet is not damaged by the fact that the temperature of the insulating strip is too high.
Compared with the prior art, the invention has the advantages that: the welding device and the method have the advantages of high efficiency, firmness, attractive appearance, strong tensile force, low cost, high yield and the like, and compared with a hot pressing and needle sewing method, the novel heating wire welding method process reduces the production cost by sixty percent and has high yield.
Drawings
Fig. 1 is a schematic view of the construction of a fusion apparatus of the present invention.
Fig. 2 is a partial structural view of the fusion apparatus of the present invention.
Fig. 3 is a partially enlarged view of a portion a in fig. 2.
Wherein, 1-a main machine seat; 2-a support plate; 3-a transmission arm; 4, pressing a plate; 5-cross brace laths; 6-vertical brace bar plate; 7-a backing plate; 8-insulating bar block; 9-a guide bar; 10-a cover plate; 11-a gap; 12-positioning blocks; 13-a water pipe; 14-a locking plate; 15-PP flakes; 16-PP foam board; 801-heating wires; 802-thermally conductive film; 803-water flow channel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a welding device for a PP sheet and a PP foaming plate comprises a main machine base 1, a support plate 2, a transmission arm 3, a pressing plate 4, a cross brace strip 5, a vertical brace strip 6, a base plate 7, an insulating strip block 8, a guide strip 9, a cover plate 10, a gap 11, a positioning block 12, a water pipe 13, a locking plate 14, a PP sheet 15 and a PP foaming plate 16;
a hydraulic transmission device and a water tank are arranged in the main machine seat 1, the supporting plate 2 is arranged at the top end of the main machine seat 1, two transmission arms 3 symmetrically distributed on two sides of the supporting plate 2 are arranged on the supporting plate 2, a pressing plate 4 is arranged on the transmission arms 3, and the pressing plate 4 is in transmission connection with the hydraulic transmission device to realize up-and-down sliding; the supporting plate 2 between the driving arms 3 at two sides is provided with a cross brace strip plate 5 which is symmetrically arranged, the cross brace strip plate 5 is welded with a vertical brace strip plate 6, the upper end of the vertical brace strip plate 6 is fixed with a backing plate 7, an insulating strip block 8 and a guide strip 9 are fixed on the backing plate 7, the guide strip 9 is positioned at the inner side of the insulating strip block 8, the insulating strip block 8 and the guide strip 9 are provided with a gap 11, the inner side of the guide strip 9 is provided with a positioning block 12, the insulating strip block 8 is provided with a cover plate 10,
the base plate 7, the insulating strip block 8 and the cover plate 10 are locked on the vertical stay plate 6 through screws; the guide strip 9 is locked on the backing plate 7 through a screw; a heating wire 801 is arranged at the upper end of the insulating strip block 8 on the inner side of the cover plate 10, a heat conducting film 802 is coated on the heating wire 801, two ends of the heating wire 801 are pressed in the insulating strip block 8, two ends of the heating wire 801 are locked by connecting the insulating strip block 8 with screws, and then the heating wire is connected with a power supply arranged in the main machine base 1 for electrifying and heating; with the two ends of the heating wire 801 being screwed, the heating wire 801 is also tensioned, the wrapped heat conducting film 802 is also pressed on the insulating strip block 8, the heat conducting film 802 is made of a material which is high temperature resistant and has a good heat conducting coefficient, the heating wire 801 is wrapped, the situation that the PP sheet 15 is damaged due to the fact that the heating wire 801 is in direct contact with the processed PP sheet 15 is avoided, the PP sheet 15 is burnt and damaged due to the fact that the temperature is too high, the heating wire 801 is also prevented from being in contact with air and is easy to oxidize after being heated, the service life of the heating wire 801 is prolonged, the heat conducting film 802 has a good heat conducting coefficient, the heat of the heating wire 801 can be well conducted to melt the processed PP sheet 15;
meanwhile, the insulating blocks 8 are provided with water flow channels 803, and the water flow channels 803 on the insulating blocks 8 at two sides are communicated through a water pipe 13 and are connected with a water pump arranged in a water tank through the water pipe 13; the water in the water pump in the main machine seat 1 is pumped into the water flow channel 803 in the insulating strip block 8 through the water pipe 13 to circulate, and then flows back to the water tank in the main machine seat 1 through the water pipe 13, so that the heat conducted by the heating wire 801 to the insulating strip block 8 in the heating process is reduced by repeatedly circulating and circulating, and the processed PP sheet 15 is not damaged by the high temperature of the insulating strip block 8;
the positioning block 12 can slide on a sliding rail arranged on the inner side of the guide strip according to the sizes of the PP thin sheet 15 and the PP foaming plate 16 to form a distance suitable for processing the PP thin sheet 15 and the PP foaming plate 16.
A welding method of a PP sheet and a PP foaming plate comprises the following steps:
(1) inserting a PP sheet 15 to be processed into the welding device by bypassing the guide strips 9 at two sides of the welding device and the gap 11 between the insulating strip blocks 8, and turning the upper end of the PP sheet 15 outwards and flatly paving the PP sheet on the heat conducting film 802;
(2) covering a PP foaming plate 16 on a PP sheet 15 which is turned outwards and laid on a heat conducting film 802 flatly, controlling pressing plates 4 on transmission arms 3 at two sides to press down and tightly press the PP foaming plate 16 and the PP sheet 15 through a hydraulic transmission device in a main machine seat 1 so as to enable the PP foaming plate 16 and the PP sheet 15 to be in close contact, electrifying a power supply in the main machine seat 1 to heat a heating wire 801, conducting heat by the heat conducting film 802 to melt and scald the PP sheet 15, and welding two sides of the PP sheet 15 and the PP foaming plate 16 together;
(3) when the two sides of the PP sheet 15 are welded with the PP foaming plate 16, the hydraulic transmission device in the main machine base 1 controls the pressing plates 4 on the transmission arms 3 at the two sides to rise simultaneously, and finally, the finished product is taken out.
The heat conducting film on the insulating strip block is made of a material which is high temperature resistant and has a good heat conducting coefficient, the heat conducting film is wrapped by the heating wire, the heating wire is prevented from directly contacting with the processed PP thin sheet, the PP thin sheet is damaged due to overhigh temperature, the heating wire is also prevented from contacting with air and is easy to oxidize after being heated, the service life of the heating wire is prolonged, the heat conducting film has a good heat conducting coefficient, the heat of the heating wire can be well conducted to the processed PP thin sheet, the PP thin sheet and the PP foaming plate are better fused together, a water flow channel is arranged in the insulating strip block, two ends of the water flow channel are respectively connected with a water pump in the main machine seat through a water pipe and are led into a water tank arranged in the main machine seat, the water in the water tank in the main machine seat is pumped by the water pump in the main machine seat, the water is injected into the water flow channel in the insulating strip block through the water pipe, the processed PP thin sheet is not damaged by the fact that the temperature of the insulating strip is too high.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A welding device for a PP sheet and a PP foaming plate comprises a main machine base (1), a supporting plate (2), a driving arm (3), a pressing plate (4), a cross-brace batten (5), a vertical-brace batten (6), a base plate (7), an insulating strip block (8), a guide strip (9), a cover plate (10), a gap (11), a positioning block (12), a water pipe (13), a locking plate (14), the PP sheet (15) and the PP foaming plate (16);
a hydraulic transmission device and a water tank are arranged in the main machine seat (1), the supporting plate (2) is arranged at the top end of the main machine seat (1), two transmission arms (3) symmetrically distributed on two sides of the supporting plate (2) are arranged on the supporting plate (2), a pressing plate (4) is arranged on the transmission arms (3), and the pressing plate (4) is in transmission connection with the hydraulic transmission device to realize up-and-down sliding; the cross brace batten (5) is symmetrically arranged on the supporting plate (2) between the two side transmission arms (3), the vertical brace batten (6) is welded on the cross brace batten (5), a base plate (7) is fixed at the upper end of the vertical brace batten (6), an insulating strip block (8) and a guide strip (9) are fixed on the base plate (7), the guide strip (9) is positioned at the inner side of the insulating strip block (8), gaps (11) are arranged on the insulating strip block (8) and the guide strip (9), a positioning block (12) is arranged at the inner side of the guide strip (9), a cover plate (10) is arranged on the insulating strip block (8),
the base plate (7), the insulating strip block (8) and the cover plate (10) are locked on the vertical stay plate (6) through screws; the guide strip (9) is locked on the backing plate (7) through a screw; a heating wire (801) is arranged at the upper end of the insulating strip block (8) on the inner side of the cover plate (10), a heat conducting film (802) is coated on the heating wire (801), two ends of the heating wire (801) are pressed in the insulating strip block (8), two ends of the heating wire (801) are locked by the insulating strip block (8) through screws, and then the heating wire is connected with a power supply arranged in the main machine seat (1) for electrifying and heating;
meanwhile, a water flow channel (803) is arranged on the insulating bar blocks (8), and the water flow channels (803) on the insulating bar blocks (8) on the two sides are communicated through a water pipe (13) and are connected with a water pump arranged in the water tank through the water pipe (13).
2. The welding device of the PP thin sheet and the PP foaming plate as claimed in claim 1, wherein the welding method comprises the following steps:
(1) inserting a PP thin sheet (15) to be processed around a gap (11) between a guide strip (9) and an insulating strip block (8) at two sides of the welding device, and turning the upper end of the PP thin sheet (15) outwards and flatly paving the PP thin sheet on a heat conducting film (802);
(2) covering a PP foaming plate (16) on a PP sheet (15) which is turned outwards and laid on a heat-conducting film (802), controlling pressing plates (4) on transmission arms (3) at two sides to press down and tightly press the PP foaming plate (16) and the PP sheet (15) through a hydraulic transmission device in a main machine seat (1) so that the PP foaming plate and the PP sheet are in close contact, electrifying a power supply in the main machine seat (1) to heat a heating wire (801), conducting heat by the heat-conducting film (802) to melt and scald the PP sheet (15), and welding two sides of the PP sheet (15) and the PP foaming plate (16) together;
(3) when the two sides of the PP sheet (15) are welded with the PP foaming plate (16), the pressing plates (4) on the transmission arms (3) at the two sides are controlled to simultaneously lift through a hydraulic transmission device in the main machine seat (1), and finally, a finished product is taken out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134413.1A CN111376488A (en) | 2019-02-23 | 2019-02-23 | Welding device and welding method for PP thin sheet and PP foaming plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134413.1A CN111376488A (en) | 2019-02-23 | 2019-02-23 | Welding device and welding method for PP thin sheet and PP foaming plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111376488A true CN111376488A (en) | 2020-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910134413.1A Pending CN111376488A (en) | 2019-02-23 | 2019-02-23 | Welding device and welding method for PP thin sheet and PP foaming plate |
Country Status (1)
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|---|---|
| CN (1) | CN111376488A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR890014245A (en) * | 1988-03-21 | 1989-10-23 | 김종복 | Bonding of thin resin and sponge using high frequency heating means |
| JP2007090599A (en) * | 2005-09-28 | 2007-04-12 | Sumitomo Chemical Co Ltd | Manufacturing method of thermoplastic resin foamed laminated sheet |
| CN204658939U (en) * | 2015-05-11 | 2015-09-23 | 杭州科技职业技术学院 | The welder of plastic sheet |
| CN205291581U (en) * | 2015-08-25 | 2016-06-08 | 东莞市艾立克机械制造有限公司 | Sponge butt fusion device |
| CN206938006U (en) * | 2016-11-16 | 2018-01-30 | 昆山昶捷精密模具工业有限公司 | A kind of hot-melting device of plastic components |
| CN207028221U (en) * | 2017-06-10 | 2018-02-23 | 中山市美通电子有限公司 | A kind of welding heater |
-
2019
- 2019-02-23 CN CN201910134413.1A patent/CN111376488A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR890014245A (en) * | 1988-03-21 | 1989-10-23 | 김종복 | Bonding of thin resin and sponge using high frequency heating means |
| JP2007090599A (en) * | 2005-09-28 | 2007-04-12 | Sumitomo Chemical Co Ltd | Manufacturing method of thermoplastic resin foamed laminated sheet |
| CN204658939U (en) * | 2015-05-11 | 2015-09-23 | 杭州科技职业技术学院 | The welder of plastic sheet |
| CN205291581U (en) * | 2015-08-25 | 2016-06-08 | 东莞市艾立克机械制造有限公司 | Sponge butt fusion device |
| CN206938006U (en) * | 2016-11-16 | 2018-01-30 | 昆山昶捷精密模具工业有限公司 | A kind of hot-melting device of plastic components |
| CN207028221U (en) * | 2017-06-10 | 2018-02-23 | 中山市美通电子有限公司 | A kind of welding heater |
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Application publication date: 20200707 |
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