CN112793114A - Method for forming PLA extrusion molded product - Google Patents
Method for forming PLA extrusion molded product Download PDFInfo
- Publication number
- CN112793114A CN112793114A CN202011515782.4A CN202011515782A CN112793114A CN 112793114 A CN112793114 A CN 112793114A CN 202011515782 A CN202011515782 A CN 202011515782A CN 112793114 A CN112793114 A CN 112793114A
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- extrusion
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- 238000001125 extrusion Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000000465 moulding Methods 0.000 claims abstract description 26
- 238000000748 compression moulding Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 21
- 230000003139 buffering effect Effects 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 abstract 4
- 238000003490 calendering Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000007723 die pressing method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/28—Storing of extruded material, e.g. by winding up or stacking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of PLA compression molding and relates to a method for molding a PLA extrusion molded product. It comprises the following steps: extruding a PLA raw material through a screw extruder and an extrusion die head, forming a PLA sheet through a calender after extrusion, cooling the PLA sheet through a cooling device, heating the PLA sheet after cooling through a buffer device through a heating device to obtain the PLA sheet with a partial softening area required by compression molding, closing the die and compression molding a product through a molding press after heating the partially softened PLA sheet, fixing the un-softened part of the PLA sheet by using a clamp while closing the die of the molding press, stopping rolling by a rolling machine, opening the die by the molding press while loosening the PLA sheet by using the clamp, forming the molded product, and continuously rolling and recycling the residual PLA material by the rolling machine. The invention solves the technical problem that the two or more times of thermal forming increases uncontrollable factors of the performance of the original PLA material.
Description
Technical Field
The invention belongs to the technical field of PLA compression molding and relates to a method for molding a PLA extrusion molded product.
Background
At present, PLA compression molding is formed through twice thermal forming, firstly, a PLA raw material extruder melts and plasticizes, and a sheet is formed through extrusion and die-punching extrusion, the sheet is calendered through a calender, the sheet after calendering is cut and formed into a required sheet after cooling, and secondly, the formed PLA sheet is formed into a product through compression molding, the middle of the mode is discontinuous, and the original uncontrollable factors of the performance of the PLA material are increased through twice thermal forming.
Disclosure of Invention
The invention aims to solve the problems and provides a method for forming a PLA extrusion molded product.
In order to achieve the purpose, the invention adopts the following technical scheme:
a PLA extrusion molding forming method comprises the following steps: extruding a PLA raw material through a screw extruder and an extrusion die head, forming a PLA sheet through a calender after extrusion, cooling the PLA sheet through a cooling device, adjusting the speed of the extruded PLA sheet through a buffer device to be matched with the compression molding speed of a molding press and the winding speed of a winding machine, heating the PLA sheet after passing through the buffer device through a heating device to obtain the PLA sheet with a partial softening area required during compression molding, closing the mold of the heated partially softened PLA sheet through the molding press to mold a compression molding product, fixing the un-softened part of the PLA sheet by using a clamp while closing the mold of the molding press, stopping winding by the winding machine, opening the mold of the mold by using the clamp, releasing the PLA sheet, forming the compression molding product, and continuously winding and recycling the rest PLA material by using the molding press.
In the above PLA extrusion molding method, the buffering device includes a front guide roller assembly and a rear guide roller assembly, and a movable guide roller assembly located between the front guide roller assembly and the rear guide roller assembly and capable of reciprocating in a vertical direction.
In the above-mentioned PLA extrusion die pressing product forming method, the movable guide roller assembly including fix first location deflector roll and the second location deflector roll on the frame, first location deflector roll and second location deflector roll between be equipped with the removal deflector roll, remove the deflector roll and be connected with vertical riser, vertical riser have can be along straight reciprocating motion's output shaft.
In the above PLA extrusion molding forming method, the first positioning guide roller and the second positioning guide roller have the same horizontal height, the vertical lifter is an oil cylinder, the oil cylinder is fixed on the ground, and an output shaft of the oil cylinder is connected with the movable guide roller.
In one of the above PLA extrusion molded products forming methods, a projection of the matched-mold molded product in the vertical direction is located within a partially softened area of the PLA sheet.
In the above-mentioned PLA extrusion die pressing product forming method, the fixture has a plurality of and sets up along the central line symmetry of moulding press, the anchor clamps quantity of PLA sheet both sides is the same and one-to-one, the fixture includes the fixture support with ground fixed connection, be equipped with one on the fixture support with the fixture support fixed connection and be the lower plate of level setting, be equipped with two guide pillars that set up along the central line symmetry of lower plate on the lower plate, the cover is equipped with an upper plate with guide pillar swing joint on the guide pillar, the tip that two guide pillars kept away from the lower plate is connected with a fixed plate fixed connection, be connected with the straight line driver on the fixed plate, the output shaft of straight line driver is connected with the upper plate.
In the forming method of the PLA extrusion molded product, the fat dissolving of the PLA raw material is between 5 and 15.
In the forming method of the PLA extrusion die product, the extrusion die head adopts double-sided heating, the thickness of the PLA sheet extruded from the extrusion die head is 0.5-5 mm, the temperature is 100-170 ℃, and the surface roughness is less than or equal to 0.04 mu m.
In the above-mentioned PLA extrusion molding product forming method, the temperature control range of the cooling device is 25-100 ℃.
In the method for forming the PLA extrusion molded product, the PLA sheet after passing through the buffer device is heated by the heating device to obtain the PLA sheet with a partial softening area required by compression molding, and the temperature of the partial softening area is 60-80 ℃.
Compared with the prior art, the invention has the advantages that:
the technical problem that the two-time or multiple-time thermal forming increases uncontrollable factors of the performance of the original PLA material is solved, the one-time thermal forming extrusion compression molding PLA product is adopted, the time waste and the comprehensive performance problem of the molded product after the secondary thermal forming are reduced, and the performance and the production efficiency of the molded product are improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the jig.
In the figure: the device comprises a screw extruder 1, an extrusion die head 2, a PLA sheet 3, a cooling device 4, a buffering device 5, a molding press 6, a winding machine 7, a heating device 8, a clamp 9, a front guide roller assembly 10, a rear guide roller assembly 11, a movable guide roller assembly 12, a machine base 13, a first positioning guide roller 14, a second positioning guide roller 15, a moving guide roller 16, a vertical lifter 17, a clamp bracket 18, a lower clamping plate 19, a guide post 20, an upper clamping plate 21, a fixed plate 22, a linear driver 23 and a calender 25.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
As shown in fig. 1, a PLA extrusion molding forming method includes the following steps: extruding a PLA raw material 100 through a screw extruder 1 and an extrusion die head 2, forming a PLA sheet 3 through a calender 25 after extrusion, cooling the PLA sheet 3 through a cooling device 4, adjusting the speed of the extruded PLA sheet through a buffer device 5 to match the compression molding speed of a molding press 6 and the winding speed of a winding machine 7, heating the PLA sheet 3 after passing through the buffer device 24 through a heating device 8 to obtain the PLA sheet with a partially softened area required during compression molding, closing the mold of the molding press 6 to mold a compression molding product 101 after heating the partially softened PLA sheet, fixing the un-softened part of the PLA sheet through a clamp 9 while closing the mold of the molding press 6, stopping winding the winding machine 7, opening the mold of the molding press 6 while loosening the PLA sheet by the clamp 9, molding the product, and continuously winding and recycling the rest PLA material by the winding machine 7.
In this embodiment, the calender 25, the screw extruder 1, the extrusion die 2, the molding press 6, and the winder 7 are all commercially available products, and the prior art can be adopted. The cooling device 4 is an air cooling machine, the temperature control range is adjustable within 0-100 ℃, and preferably, the temperature control range of the cooling device 4 is 25-100 ℃. The cooling device 4 directly blows air to the PLA sheet 3 for cooling, the heating device 8 is an air heater or an infrared heater, the temperature is adjustable at 20-180 ℃, and the PLA sheet is also a commercially available product. The frequency conversion of the winding machine 7 is adjustable, and the speed is 5-50 m/S. The surface roughness of the calender roll of the calender 25 is less than or equal to 0.04 mu m.
The fat dissolving amount of the PLA raw material is 5-15. The extrusion die head 2 adopts double-sided heating, the thickness of the PLA sheet 3 extruded from the extrusion die head 2 is 0.5-5 mm, the temperature is 100-170 ℃, and the surface roughness is less than or equal to 0.04 mu m.
The embodiment solves the problem that the two or more times of thermal forming increases uncontrollable factors of the performance of the original PLA material, adopts one-time thermal forming to extrude a compression molding PLA product, reduces the time waste and the comprehensive performance problem of the molded product after the secondary thermal forming, and improves the performance and the production efficiency of the molded product.
The PLA sheet 3 after passing through the buffer device 5 is heated by the heating device 8 to obtain the PLA sheet with partial softening area required by compression molding, the temperature of the partial softening area is 60-80 ℃, and the PLA sheet is suitable for a compression molding product of the molding press 6 at the temperature.
When a product is molded by compression, when the clamp 9 clamps an unsoftened part of the PLA sheet, the PLA sheet is at a standstill in the molding press 6, the winding machine is also at a stop state, but the screw extruder 1 still extrudes the PLA sheet through the extrusion die head 2, namely the screw extruder 1 does not stop working, the PLA sheet is still continuously extruded, and interference is generated at the moment, and in the embodiment, the technical problem is solved through the buffer device 5.
Specifically, the buffering device 5 includes a front guide roller assembly 10 and a rear guide roller assembly 11, and a movable guide roller assembly 12 located between the front guide roller assembly 10 and the rear guide roller assembly 11 and capable of reciprocating in a vertical direction.
The movable guide roller assembly 12 comprises a first positioning guide roller 14 and a second positioning guide roller 15 which are fixed on the machine base 13, a movable guide roller 16 is arranged between the first positioning guide roller 14 and the second positioning guide roller 15, the movable guide roller 16 is connected with a vertical lifter 17, and the vertical lifter 17 is provided with an output shaft which can reciprocate along a straight line.
The same and parallel each other of the level of first location deflector roll 14 and second location deflector roll 15, vertical riser 17 be the hydro-cylinder, the hydro-cylinder fix on subaerial or frame, the output shaft and the removal deflector roll 16 of hydro-cylinder are connected. Preferably, the hydro-cylinder has two, and the output shaft of two hydro-cylinders is connected the one end of removing the deflector roll 16 respectively, removes the deflector roll 16 and can go up and down along vertical direction under the effect of hydro-cylinder.
The PLA sheet 3 passes first through the leading roller assembly 10, then onto the first positioning roller 14, under the moving roller 16 and then onto the second positioning roller 15, and finally through the trailing roller assembly 11. When the movable guide roller 16 ascends, the length of the PLA sheet 3 in the whole buffer device 5 is shortened, and when the movable guide roller 16 descends, the length of the PLA sheet 3 in the whole buffer device 5 is lengthened, so that the PLA sheet 3 is absorbed and released, the buffer effect is achieved, and the mutual interference state that the PLA sheets move and are static is solved.
Specifically, when the clamp 9 clamps the PLA sheet 3, the moving guide roller 16 descends to absorb the PLA sheet 3 extruded by the screw extruder 1, and when the clamp 9 is released, the moving guide roller 16 ascends to release the PLA sheet 3 and provide a space for the next continuous absorption.
The projection of the matched-mold compression molded product in the vertical direction is located within a partially softened area of the PLA sheet. That is, the size of the product is smaller than the partial softening area, so that it is ensured that a sufficient area for pressing the product is obtained at the time of pressing.
The clamps 9 are symmetrically arranged along the central line of the molding press 6, and the clamps 9 on two sides of the PLA sheet material 3 are same in number and are in one-to-one correspondence.
As shown in fig. 2, the fixture 9 includes a fixture support 18 fixedly connected to the ground, a lower clamp plate 19 horizontally disposed and fixedly connected to the fixture support 18 is disposed on the fixture support 18, the lower clamp plate 19 may also be fixedly connected to the base, two guide pillars 20 symmetrically disposed along a central line of the lower clamp plate 19 are disposed on the lower clamp plate 19, an upper clamp plate 21 movably connected to the guide pillars 20 is sleeved on the guide pillars 20, ends of the two guide pillars 20 far away from the lower clamp plate 19 are fixedly connected to a fixing plate 22, a linear actuator 23 is connected to the fixing plate 22, and an output shaft of the linear actuator 23 is connected to the upper clamp plate 21.
The linear actuator 23 is a pneumatic cylinder or a linear motor, and when the output shaft of the linear actuator 23 is extended, the linear actuator drives the upper clamping plate 21 to be close to the lower clamping plate 19, so that the PLA sheet is clamped, and when the output shaft of the linear actuator 23 is retracted, the upper clamping plate 21 is far away from the lower clamping plate 19, so that the PLA sheet is released.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit of the invention.
Claims (10)
1. A PLA extrusion molding product forming method is characterized by comprising the following steps: extruding a PLA raw material through a screw extruder (1) and an extrusion die head (2), forming a PLA sheet (3) through a calender (25) after extrusion, cooling the PLA sheet (3) through a cooling device (4), adjusting the speed of the extruded PLA sheet through a buffer device (5) to enable the extruded PLA sheet to be matched with the compression molding speed of a molding press (6) and the winding speed of a winding machine (7), heating the PLA sheet (3) after passing through the buffer device (5) through a heating device (8) to obtain a PLA sheet with a partial softening area required during compression molding, closing the mold of the heated PLA sheet after partial softening through the molding press (6) to mold a product, fixing the non-softening part of the PLA sheet through a clamp (9) while closing the mold of the molding press (6), stopping winding and winding the winding machine (7), opening the mold through the molding press (6) and loosening the clamp (9), and (5) molding the molded product, and continuously winding and recycling the remaining PLA material by using a winding machine (7).
2. A PLA extrusion molded article forming method as claimed in claim 1, wherein the buffering means (5) comprises a front guide roller assembly (10) and a rear guide roller assembly (11), and a movable guide roller assembly (12) located between the front guide roller assembly (10) and the rear guide roller assembly (11) and capable of reciprocating in a vertical direction.
3. A PLA extrusion molding forming method as claimed in claim 2, wherein the movable guide roller assembly (12) comprises a first positioning guide roller (14) and a second positioning guide roller (15) fixed on the machine base (13), a moving guide roller (16) is disposed between the first positioning guide roller (14) and the second positioning guide roller (15), the moving guide roller (16) is connected with a vertical lifter (17), and the vertical lifter (17) has an output shaft capable of reciprocating along a straight line.
4. A PLA extrusion molding forming method as claimed in claim 3, wherein the first positioning guide roller (14) and the second positioning guide roller (15) have the same horizontal height, the vertical lifter (17) is a cylinder, the cylinder is fixed on the ground, and the output shaft of the cylinder is connected to the moving guide roller (16).
5. A PLA extrusion molded article forming method as claimed in claim 1, wherein a projection of the matched-die molded product in a vertical direction is located within a part of the softened area of the PLA sheet.
6. A PLA extrusion molding forming method as claimed in claim 1, wherein the clamps (9) are provided with a plurality of clamps and are symmetrically arranged along the center line of the molding press (6), the clamps (9) on both sides of the PLA sheet (3) are provided with the same number and correspond to each other one by one, the clamps (9) comprise clamp brackets (18) fixedly connected with the ground, a lower clamp plate (19) fixedly connected with the clamp brackets (18) and horizontally arranged is arranged on the clamp brackets (18), two guide pillars (20) symmetrically arranged along the center line of the lower clamp plate (19) are arranged on the lower clamp plate (19), an upper clamp plate (21) movably connected with the guide pillars (20) is sleeved on the guide pillars (20), the end parts of the two guide pillars (20) far away from the lower clamp plate (19) are fixedly connected with a fixing plate (22), a linear driver (23) is connected on the fixing plate (22), the output shaft of the linear driver (23) is connected with the upper clamping plate (21).
7. The forming method of PLA extruded molded product as claimed in claim 1, wherein the fat of the PLA material is between 5 and 15.
8. The method for forming the PLA extrusion molded product as claimed in claim 1, wherein the extrusion die head (2) adopts double-sided heating, the thickness of the PLA sheet material (3) extruded from the extrusion die head (2) is 0.5-5 mm, the temperature is 100-170 ℃, and the surface roughness is less than or equal to 0.04 μm.
9. A PLA extrusion molded article forming method as claimed in claim 1, wherein the temperature control range of the cooling device (4) is 25-100 ℃.
10. A PLA extrusion molded product forming method as claimed in claim 1, wherein the PLA sheet (3) after passing through the buffer device (24) is heated by the heating device (8) to obtain the PLA sheet with partial softening area required by compression molding, and the temperature of the partial softening area is 60-80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011515782.4A CN112793114A (en) | 2020-12-21 | 2020-12-21 | Method for forming PLA extrusion molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011515782.4A CN112793114A (en) | 2020-12-21 | 2020-12-21 | Method for forming PLA extrusion molded product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112793114A true CN112793114A (en) | 2021-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011515782.4A Pending CN112793114A (en) | 2020-12-21 | 2020-12-21 | Method for forming PLA extrusion molded product |
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| Country | Link |
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| CN (1) | CN112793114A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114454448A (en) * | 2021-12-15 | 2022-05-10 | 宿迁市金田塑业有限公司 | Manufacturing process and intelligent manufacturing equipment of color base film based on multidirectional stretching |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362324A (en) * | 2002-01-10 | 2002-08-07 | 王世和 | Extruder and calender combination for processing completely biodegradable material |
| CN204398461U (en) * | 2014-12-29 | 2015-06-17 | 天津鼎一电气成套设备有限公司 | A kind of switch cubicle automatic processing device |
| CN110614759A (en) * | 2019-10-16 | 2019-12-27 | 汕头市明发机械有限公司 | Continuous extrusion high-energy-saving positive and negative pressure thermal forming mechanism |
-
2020
- 2020-12-21 CN CN202011515782.4A patent/CN112793114A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362324A (en) * | 2002-01-10 | 2002-08-07 | 王世和 | Extruder and calender combination for processing completely biodegradable material |
| CN204398461U (en) * | 2014-12-29 | 2015-06-17 | 天津鼎一电气成套设备有限公司 | A kind of switch cubicle automatic processing device |
| CN110614759A (en) * | 2019-10-16 | 2019-12-27 | 汕头市明发机械有限公司 | Continuous extrusion high-energy-saving positive and negative pressure thermal forming mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114454448A (en) * | 2021-12-15 | 2022-05-10 | 宿迁市金田塑业有限公司 | Manufacturing process and intelligent manufacturing equipment of color base film based on multidirectional stretching |
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Application publication date: 20210514 |
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