CN106965367A - A kind of controllable skinning fretting map injection mold device of polymer and its molding process - Google Patents
A kind of controllable skinning fretting map injection mold device of polymer and its molding process Download PDFInfo
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- CN106965367A CN106965367A CN201710389614.7A CN201710389614A CN106965367A CN 106965367 A CN106965367 A CN 106965367A CN 201710389614 A CN201710389614 A CN 201710389614A CN 106965367 A CN106965367 A CN 106965367A
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- die cavity
- injection molding
- skinning
- injection
- temperature
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of controllable skinning fretting map injection mold device of polymer, including supercharging equipment and dynamic mould fixing plate, the supercharging equipment is connected by solenoid electric valve and oil pipe conduction device with pressurizing cylinder, the pressurizing cylinder front end is provided with main sprue bush, the main sprue bush is connected with heater and resetting means, the other end of the heater is stretched into the groove set on cover half connecting plate, and be connected with several points gum-injecting port, the several points gum-injecting port is arranged in cover half connecting plate, one end of the cover half connecting plate is connected with cover half fixed plate, the other end is connected with die cavity, pressure tester and temperature measuring equipment are respectively arranged with the die cavity, the dynamic mould fixing plate is fixedly connected by liftout attachment with die cavity, and it is provided with cooling water system in the both sides of die cavity between dynamic mould fixing plate and cover half connecting plate, the present invention by adjust temperature and pressure experiment skinning thickness it is controllable, meet various products part i.e. light and firm attractive in appearance, durable function.
Description
Technical field
The present invention relates to a kind of controllable skinning microporous foam molding process of polymer and injection mold device structure, more particularly to one
The control technique and injection mold device of kind of the dynamic dynamic microporous foam of control polymer, available for production surface is firm, glossiness
Preferably, the high polymeric articles of air entrapment consistency.
Background technology
Phase early 1980s, the J.E.Martini of Massachusetts Institute Technology first proposed micro- in its paper
The concept and preparation method of hole plastics, and obtained United States Patent (USP) with 1984.Sung W.Cha of Cambridge University in 1991 etc. exist
Supercritical fluid technique is introduced in microporous foam injection.Trexel companies of the U.S. successfully develop continuous microporous foam formation within 2001
Technology -- MuCell technologies.Demag Ergotech companies in 2003 have put on display its Ergocell cellular plastic process technology.With
The continuous progress of micro-aperture technique, cellular plastic is excellent and mechanical property is progressively exploited.Microporous foam technology reduces modeling
The product weight of material, considerably increases the toughness of product；Impact strength can increase by 5 ~ 7 times, and toughness improves 5 ~ 8 times, rigidity increase by 3
~5 times, 3 ~ 13 times of fatigue life, its density can reduce by 5%~95%,.The application field of micropore foamed polymer product
It is very broad, it is referred to as " new material of 21 century ".
However, microcellular injection molding technique comes out since more than 30 years, major institutes and leading company are sent out in micropore
Bubble technical field proposes new theory, and respective technical advantage, but real realization yet are also given full play in actual production
Properties of product simultaneously realize large-scale promotion.This is due to that this technique still faces some technical barriers, one, it is difficult to produce surface
Hard, glossiness is preferably and the small fine and close product of inner cell etc..Trexel, Inc. awards filed in 4 days November in 1999
The disclosed Chinese patent (CN200510068953.2) of power " includes the molding of the micropore low-density polymeric materials of injection molded
A kind of injection molding system and method for being used to prepare microcellular foam and microporous article is provided in polymeric material ".It is logical
Toning tries injection molding process, and this method can obtain more fine and closely woven inner cell structure, but product surface is still suffered from significantly
The mass defects such as crazing, bubble hole, spiral lamination.Also there are many theories on polymer skinning microporous foam technology, refer to by mould
Enter gases at high pressure in tool, improve product surface glossiness, internal gas is fine and close.But passed in and out by single gas, no
Can preferably control, from polymer overflow gas number and gas discharge cavity pressure control.Die cavity is either static
Foaming or dynamic foaming, pass through gas automatic foaming, single temperature adjustment, although can partly solve polymer product
The problem of surface, but the degree of skinning thickness and light is single uncontrollable.
To solve surface quality problems, the processes such as the constant technology of gas, quick cooling, heating circulating technology are employed, both
It can guarantee that product table leather block Pi get get is formed, and the stability of the gas inside melt can be ensure that because of constant pressure.This
Be National Composite Modified Polymer Material Engineering Technology Research Cen disclosed in mandate filed in 10 days January in 2011 it is Chinese
Patent " provides a kind of cavity by adjusting means in the controllable method for preparing and its device of a kind of capillary copolymer material
Product and temperature, obtain the another leap of the method for capillary copolymer material.Mold cavity volume ensure it is constant in the case of, with referring to
Fixed temperature and pressure parameter realizes the controllable of product surface skinning；Supercharging equipment continues pressurize, it is to avoid because die cavity reduces
Cause the change of product design.So as to really realize the controllable microporous foam technology of skinning.
The content of the invention
It is an object of the invention to provide a kind of controllable skinning fretting map injection mold device of polymer and its molding process, to solve
The problem of being proposed in certainly above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme：A kind of controllable skinning fretting map injection molding dress of polymer
Put, including supercharging equipment and dynamic mould fixing plate, the supercharging equipment passes through solenoid electric valve and oil pipe conduction device and pressurised oil
Cylinder is connected, and the pressurizing cylinder front end is provided with main sprue bush, and the main sprue bush is connected with heater and resetting means, institute
State resetting means to be arranged between 2 groups of heaters, the other end of the heater stretches into set on cover half connecting plate recessed
In groove, and it is connected with several points gum-injecting port, the several points gum-injecting port is arranged in cover half connecting plate, the cover half connection
One end of plate is connected with cover half fixed plate, and the other end is connected with die cavity, and pressure tester and thermometric are respectively arranged with the die cavity
Device, the dynamic mould fixing plate is fixedly connected by liftout attachment with die cavity, and between dynamic mould fixing plate and cover half connecting plate
The both sides of die cavity are provided with cooling water system.
Further, the pressurizing cylinder and heater are provided with 2 groups, and 2 groups of pressurizing cylinders pass through electromagnetism control
Valve and oil pipe conduction device processed is connected with supercharging equipment.
Further, the liftout attachment is provided with 3 groups, 3 groups of liftout attachment intervals be placed equidistant in dynamic mould fixing plate and
Between die cavity.
The invention also provides a kind of controllable skinning fretting map molding process of polymer, comprise the following steps：
S1, physical blowing agent or CBA are uniformly blended into polymer in hyperbaric environment using microporous foam injection machine melted
Body；Injection mold device temperature is raised, and is kept；
S2, closure injection molding, connect injection molding periphery water and follow passage, and keep water temperature by cooling-water machine external equipment, will be greater than
Injection mold device die cavity is injected into the melt polymers of injection molding die cavity cumulative volume, device is continued supercharging, makes guarantor in injection mold device
Lasting pressure；
S3, all sidearms of adjustment injection molding type coordinate the turnover of the water-cooling channel current of injection molding, it is persistently reduced temperature, pass through control
The temperature of injection molding die cavity exocuticle processed, makes melt polymers be cooled down in injection molding cavity side；
S4, persistently cool down mould, bubble can be moved to the slightly higher center of temperature, in the feelings of lasting holding injection mold device cavity pressure
Under condition, melt temperature drops to setting steady temperature and continues pressurize, makes polymer skin formation skinning, product approval；
S5, treat mould cool down, reduce injection pressure, open mould, ejecting product.
Further, in S1 and S2, after mould matched moulds, injection mold device temperature is raised, is injected into injection molding die cavity
The melt polymers of physical blowing agent or CBA are mixed with, polymer is entering the immediate effervescence of injection mold device；Pass through note
The heating system heats injection molding charging of the dynamic model template assembly of die device and compression portion, make its temperature reach 60-200 DEG C, pressure
Power reaches 5-10 Mpa and kept.
Further, in S2 and S3, water-cooling channel water is constantly circulated in injection molding closing course, is set by outside cooling-water machine
Standby injection molding mold cavity surface is cooled down skinning using constant water temperature, described injection molding die cavity skin temperature is continuously maintained in 60-100
DEG C, gas pressure is consistent with air pressure in die cavity before injection machine injection in injection molding die cavity, is maintained at 5-10Mpa.
Compared with prior art, the beneficial effects of the invention are as follows：The microporous foam injection molding process side that the present invention is provided
Method and supporting mould structure, hard to form crust by the Stress control epidermis skinning cortex thickness of different parameters, inside is caused
Close foam structure provides reliable condition, so as to obtain the product with the preferable surface of hard, glossiness, can overcome skinning can not
Control the bottleneck of microporous foam injection molding technology.The present invention is applicable for physical blowing and chemical blowing, is applicable not only to outward appearance
Polymeric articles, and do not limited by product structure.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
In figure：1st, supercharging equipment；2nd, solenoid electric valve；3rd, oil pipe conduction device；4th, cover half fixed plate；5th, pressurizing cylinder；
6th, heater；7th, resetting means；8th, several points gum-injecting port；9th, cover half connecting plate；10th, dynamic mould fixing plate；11st, die cavity；12、
Liftout attachment 13, pressure tester 14, cooling water system 15, temperature measuring equipment 16, main sprue bush.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1, the present invention provides a kind of technical scheme：A kind of controllable skinning fretting map injection mold device of polymer, bag
Supercharging equipment 1 and dynamic mould fixing plate 10 are included, the supercharging equipment 1 passes through solenoid electric valve 2 and oil pipe conduction device 3 and pressurised oil
Cylinder 5 is connected, and the front end of pressurizing cylinder 5 is provided with main sprue bush 16, and the main sprue bush 16 is connected with heater 6 and reset
Device 7, the resetting means 7 is arranged between 2 groups of heaters 6, and the other end of the heater 6 stretches into cover half connecting plate
In the groove set on 9, and it is connected with several points gum-injecting port 8, the several points gum-injecting port 8 is arranged on cover half connecting plate 9
Interior, one end of the cover half connecting plate 9 is connected with cover half fixed plate 4, and the other end is connected with die cavity 11, on the die cavity 11 respectively
Pressure tester 13 and temperature measuring equipment 15 are provided with, the dynamic mould fixing plate 10 is fixedly connected by liftout attachment 12 with die cavity 11,
And it is provided with cooling water system 14 in the both sides of die cavity 11 between dynamic mould fixing plate 10 and cover half connecting plate 9.
Specifically, the pressurizing cylinder 5 and heater 6 are provided with 2 groups, and 2 groups of pressurizing cylinders 5 pass through electromagnetism control
Valve 2 and oil pipe conduction device 3 processed are connected with supercharging equipment 1.
Specifically, the liftout attachment 12 is provided with 3 groups, 3 groups of intervals of liftout attachment 12 are placed equidistant in dynamic mould fixing plate
Between 10 and die cavity 11.
The invention also provides a kind of controllable skinning fretting map molding process of polymer, comprise the following steps：
S1, physical blowing agent or CBA are uniformly blended into polymer in hyperbaric environment using microporous foam injection machine melted
Body；Injection mold device temperature is raised, and is kept；
S2, closure injection molding, connect injection molding periphery water and follow passage, and keep water temperature by cooling-water machine external equipment, will be greater than
Injection mold device die cavity is injected into the melt polymers of injection molding die cavity cumulative volume, device is continued supercharging, makes guarantor in injection mold device
Lasting pressure；
S3, all sidearms of adjustment injection molding type coordinate the turnover of the water-cooling channel current of injection molding, it is persistently reduced temperature, pass through control
The temperature of injection molding die cavity exocuticle processed, makes melt polymers be cooled down in injection molding cavity side；
S4, persistently cool down mould, bubble can be moved to the slightly higher center of temperature, in the feelings of lasting holding injection mold device cavity pressure
Under condition, melt temperature drops to setting steady temperature and continues pressurize, makes polymer skin formation skinning, product approval；
S5, treat mould cool down, reduce injection pressure, open mould, ejecting product.
Specifically, in S1 and S2, after mould matched moulds, raising injection mold device temperature, injecting and mixed into injection molding die cavity
There are the melt polymers of physical blowing agent or CBA, polymer is entering the immediate effervescence of injection mold device；Pass through injection molding
The heating system heats injection molding charging of the dynamic model template assembly of device and compression portion, make its temperature reach 60-200 DEG C, pressure
Reach 5-10 Mpa and keep.
Specifically, in S2 and S3, water-cooling channel water is constantly circulated in injection molding closing course, pass through outside cold water machine equipment
Injection molding mold cavity surface is set to cool down skinning using constant water temperature, described injection molding die cavity skin temperature is continuously maintained in 60-100
DEG C, gas pressure is consistent with air pressure in die cavity before injection machine injection in injection molding die cavity, is maintained at 5-10Mpa.
The course of work of the embodiment of the present invention is：
Step 1, using microporous foam injection machine physical blowing agent or CBA be uniformly blended into polymerization in hyperbaric environment
Thing melt；Raise injection mold device heater 6, resetting means 7, gum-injecting port 8, cover half connecting plate 9, temperature at multiple, and keep；
Step 2, closure injection molding, connect the injection molding periphery water circulation decorum 14, and keep water temperature by cooling-water machine external equipment, will
Melt polymers more than or equal to injection molding die cavity cumulative volume are injected into injection mold device die cavity 11, utilize lasting supercharging device 1 and increasing
Compressing cylinder 5 makes device continue supercharging, die cavity 11 in injection mold device is kept lasting pressure；
Step 3, all sidearms of adjustment injection molding type coordinate the turnover of the current of water-cooling channel 14 of injection molding, it is persistently reduced temperature,
By controlling the temperature of the exocuticle of injection molding die cavity 11, melt polymers are made to be cooled down in the side of injection molding die cavity 11；Period is filled by pressure measurement
Put 13, temperature measuring equipment 15 and be adjusted observation, carry out technique adjustment.
Step 4, mould persistently cooled down by cooling system 14, in the case of lasting holding injection mold device cavity pressure,
Melt temperature drops to setting steady temperature and continues pressurize, makes polymer skin formation skinning, utilizes product approval.
Step 5, treat that mould is cooled down, supercharging device 1 and pressurizing cylinder 5 reduce die cavity 11, mould are opened, with liftout attachment
12 ejecting products.
The injection mold device that the present invention is provided, various technological parameters pass through adjustment it is clear that be easy to the demand according to product
The thickness of temperature and pressure experiment skinning it is controllable, meet that various products part is i.e. light and firm function attractive in appearance, durable；
And the microporous foam injection molding process method of the invention provided and supporting mould structure, pass through the Stress control of different parameters
Epidermis skinning cortex thickness, hard to form crust, interior solid foam structure provides reliable condition, so as to obtain with heavily fortified point
Firmly, the product on the preferable surface of glossiness, can overcome the bottleneck of the uncontrollable microporous foam injection molding technology of skinning.The present invention is for physics
Foaming and chemical blowing are applicable, are applicable not only to outward appearance polymeric articles, and do not limited by product structure.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of controllable skinning fretting map injection mold device of polymer, including supercharging equipment（1）And dynamic mould fixing plate（10）, its feature
It is：The supercharging equipment（1）Pass through solenoid electric valve（2）With oil pipe conduction device（3）With pressurizing cylinder（5）Connection, it is described
Pressurizing cylinder（5）Front end is provided with main sprue bush（16）, the main sprue bush（16）It is connected with heater（6）And resetting means
（7）, the resetting means（7）It is arranged on 2 groups of heaters（6）Between, the heater（6）The other end stretch into cover half company
Fishplate bar（9）In the groove of upper setting, and with several points gum-injecting port（8）Connection, the several points gum-injecting port（8）It is fixed to be arranged on
Mould connecting plate（9）It is interior, the cover half connecting plate（9）One end and cover half fixed plate（4）Connection, the other end and die cavity（11）Even
Connect, the die cavity（11）On be respectively arranged with pressure tester（13）And temperature measuring equipment（15）, the dynamic mould fixing plate（10）Pass through
Liftout attachment（12）With die cavity（11）It is fixedly connected, and dynamic mould fixing plate（10）With cover half connecting plate（9）Between in die cavity（11）
Both sides be provided with cooling water system（14）.
2. the controllable skinning fretting map injection mold device of a kind of polymer according to claim 1, it is characterised in that：The supercharging
Oil cylinder（5）And heater（6）It is provided with 2 groups, and 2 groups of pressurizing cylinders（5）Pass through solenoid electric valve（2）With oil pipe conduction
Device（3）With supercharging equipment（1）Connection.
3. the controllable skinning fretting map injection mold device of a kind of polymer according to claim 1, it is characterised in that：The ejection
Device（12）It is provided with 3 groups, 3 groups of liftout attachments（12）Interval is placed equidistant in dynamic mould fixing plate（10）And die cavity（11）Between.
4. a kind of controllable skinning fretting map molding process of the polymer required described in 1, it is characterised in that：Comprise the following steps：
S1, physical blowing agent or CBA are uniformly blended into polymer in hyperbaric environment using microporous foam injection machine melted
Body；Injection mold device temperature is raised, and is kept；
S2, closure injection molding, connect injection molding periphery water and follow passage, and keep water temperature by cooling-water machine external equipment, will be greater than
Injection mold device die cavity is injected into the melt polymers of injection molding die cavity cumulative volume, device is continued supercharging, makes guarantor in injection mold device
Lasting pressure；
S3, all sidearms of adjustment injection molding type coordinate the turnover of the water-cooling channel current of injection molding, it is persistently reduced temperature, pass through control
The temperature of injection molding die cavity exocuticle processed, makes melt polymers be cooled down in injection molding cavity side；
S4, persistently cool down mould, bubble can be moved to the slightly higher center of temperature, in the feelings of lasting holding injection mold device cavity pressure
Under condition, melt temperature drops to setting steady temperature and continues pressurize, makes polymer skin formation skinning, product approval；
S5, treat mould cool down, reduce injection pressure, open mould, ejecting product.
5. the controllable skinning fretting map molding process of a kind of polymer according to claim 4, it is characterised in that：In S1 and S2
In, after mould matched moulds, injection mold device temperature is raised, injection has been mixed with physical blowing agent or CBA into injection molding die cavity
Melt polymers, polymer enter injection mold device immediate effervescence；Pass through the heating of the dynamic model template assembly of injection mold device
System heating injection molding charging and compression portion, make that its temperature reaches 60-200 DEG C, pressure reaches 5-10 Mpa and keep.
6. the controllable skinning fretting map molding process of a kind of polymer according to claim 4, it is characterised in that：In S2 and S3
In, water-cooling channel water is constantly circulated in injection molding closing course, makes injection molding type by the constant water temperature of outside cooling-water machine equipment utilization
Chamber surface cools down skinning, and described injection molding die cavity skin temperature is continuously maintained in gas pressure in 60-100 DEG C, injection molding die cavity will
It is consistent with air pressure in the preceding die cavity of injection machine injection, it is maintained at 5-10Mpa.
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| CN201710389614.7A CN106965367A (en) | 2017-05-27 | 2017-05-27 | A kind of controllable skinning fretting map injection mold device of polymer and its molding process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710389614.7A CN106965367A (en) | 2017-05-27 | 2017-05-27 | A kind of controllable skinning fretting map injection mold device of polymer and its molding process |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1108093A (en) * | 1964-03-31 | 1968-04-03 | Eugen Gonon | Method and apparatus for producing molded articles of foamed plastics |
| CN1170662A (en) * | 1996-04-04 | 1998-01-21 | 三井东压化学株式会社 | Injection-expansion molded, thermoplastic resin product and production process thereof |
| CN1572460A (en) * | 2003-06-16 | 2005-02-02 | 小野产业株式会社 | Method of manufacturing molded product of foamed resin and apparatus for molding foamed resin |
-
2017
- 2017-05-27 CN CN201710389614.7A patent/CN106965367A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1108093A (en) * | 1964-03-31 | 1968-04-03 | Eugen Gonon | Method and apparatus for producing molded articles of foamed plastics |
| CN1170662A (en) * | 1996-04-04 | 1998-01-21 | 三井东压化学株式会社 | Injection-expansion molded, thermoplastic resin product and production process thereof |
| CN1572460A (en) * | 2003-06-16 | 2005-02-02 | 小野产业株式会社 | Method of manufacturing molded product of foamed resin and apparatus for molding foamed resin |
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Application publication date: 20170721 |
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