CN107379391A - Twice-die-opening device and technique for micropore injection moulding foaming and in-mold decoration composite molding - Google Patents

Twice-die-opening device and technique for micropore injection moulding foaming and in-mold decoration composite molding Download PDF

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Publication number
CN107379391A
CN107379391A CN201710760542.2A CN201710760542A CN107379391A CN 107379391 A CN107379391 A CN 107379391A CN 201710760542 A CN201710760542 A CN 201710760542A CN 107379391 A CN107379391 A CN 107379391A
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CN
China
Prior art keywords
cavity plate
die
drive
foaming
mold decoration
Prior art date
Application number
CN201710760542.2A
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Chinese (zh)
Inventor
郭巍
何博
毛华杰
章梦莹
Original Assignee
武汉理工大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 武汉理工大学 filed Critical 武汉理工大学
Priority to CN201710760542.2A priority Critical patent/CN107379391A/en
Publication of CN107379391A publication Critical patent/CN107379391A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025Preventing defects on the moulded article, e.g. weld lines, shrinkage marks

Abstract

The invention discloses a kind of twice-die-opening device and technique for micropore injection moulding foaming and in-mold decoration composite molding, the device includes the punch-pin and cavity plate being oppositely arranged, film and drive mechanism for in-mold decoration, it is described film adhered to be arranged on the inwall of cavity plate, the drive mechanism is connected with cavity plate, before filler, it is smaller than accessory size that the drive mechanism driving cavity plate moves to cavity dimension, after polymer and blowing agent blends melt injection die cavity and before Gas nucleation, the drive mechanism driving cavity plate rapid backward is consistent with accessory size to cavity dimension, after the completion of part foaming, the drive mechanism driving cavity plate retreats to take out part again.The present invention effectively raises the efficiency being nucleated in micropore injection moulding foaming and in-mold decoration composite molding foaming process, improves the cell morphology of product, improves the quality of product.

Description

For micropore injection moulding foaming and in-mold decoration composite molding twice-die-opening device and Technique
Technical field
The invention belongs to microporous foam injection molding and in-mold decoration forming technical field, and in particular to one kind is used for micropore Injection foaming and the twice-die-opening device and technique of in-mold decoration composite molding.
Background technology
Microcellular plastics have due to its unique structure and mitigate product quality, improve impact strength and sound insulation value The advantages that.But because in forming process, caused bubble may overflow from the surface of product, cause the surface quality of product Reduce.The conventional forming method of microporous foam has batch (-type) microporous foam, continuously extruding and molding and injection molding.Batch (-type) foams In technique, polymer is first made to the shape of product, then foamed, but because technical process is complex, the cycle is longer, It is poorly suitable for industrial production use.Continuously extruding and molding technique is using relatively broad, but its fast ram compression mouth mold limits product Yield and extrusion flow rate.Microcellular injection molding technique, the advantages that because of its short molding cycle, good product quality, turning into makes With a kind of most microporous foam formation methods.The form of abscess and distribution have very big shadow to the quality of microporous foam product Ring, show by numerous studies, when the size of abscess is small, density is big, and distribution of cells preferably, without merging in the case of, Product it is best in quality.In order that the abscess of product reaches above-mentioned condition, it is necessary to improve the nucleation efficiencies of abscess, or to polymerization Filler is added in thing improves distribution of abscess etc..
The content of the invention
It is an object of the invention to provide a kind of twice-die-opening for micropore injection moulding foaming and in-mold decoration composite molding Device and technique, it can improve microporous foam surface quality, and improve the nucleation efficiencies of abscess, improve product quality.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of twice-die-opening device for micropore injection moulding foaming and in-mold decoration composite molding, the device include relative set The punch-pin and cavity plate put, the device also include for in-mold decoration film and drive mechanism, it is described it is film adhered be arranged at it is recessed On the inwall of mould, the drive mechanism is connected with cavity plate, and before filler, the drive mechanism driving cavity plate moves to cavity dimension ratio Accessory size is small, after polymer and blowing agent blends melt injection die cavity and before Gas nucleation, the drive mechanism Drive cavity plate rapid backward consistent with accessory size to cavity dimension, after the completion of part foaming, the drive mechanism driving is recessed Mould retreats to take out part again.
By above-mentioned technical proposal, injected in polymer and blowing agent blends melt after die cavity and before Gas nucleation, The drive mechanism drives cavity plate with 1mm/s-10mm/s speed rapid backward.
By above-mentioned technical proposal, the film is polyurethane film or polyethylene terephthalate thin film.
By above-mentioned technical proposal, the thickness of the film is 0.1mm-0.3mm.
A kind of technique for the twice-die-opening device for being used for micropore injection moulding foaming and in-mold decoration composite molding, including following step Suddenly:
S1, the film for in-mold decoration being affixed on to cavity plate inwall, drive mechanism driving cavity plate motion carries out matched moulds, this When cavity dimension it is smaller than accessory size;
S2, the homogeneous system of supercritical fluid and polymer melt is injected into die cavity, after the completion of filling, continues to inject Polymer melt carries out pressurize;
After the completion of S3, pressurize, drive mechanism driving cavity plate rapid backward is consistent with accessory size to cavity dimension, and abscess is fast Fast nucleation and growth process, and carry out cooling and complete part foaming;
After the completion of S4, part foaming, drive mechanism driving cavity plate retreats to take out part again.
By above-mentioned technical proposal, in step s 2, the formation of the homogeneous system comprises the following steps:First to injection machine material Bucket add polymer raw material, reheat plasticizing, while inject supercriticality gas be used as foaming agent, screw rod stirring with The homogeneous system of supercritical fluid and polymer melt can be formed under shear action.
The present invention, have the advantages that:The present invention by being bonded the film for in-mold decoration on cavity plate inwall, Because film surface quality is preferable and thermal conductivity is lower than mold materials, the temperature of the polymer melt positioned at pad pasting side can be caused Higher, abscess is slower toward surface movement, has less gas to be overflowed from the surface, so as to improve the surface matter of product Amount, and incrustation effect is played, reduce processing step;In addition, the present invention is by setting drive mechanism, when polymer and The melt of blowing agent blends is molded into after die cavity, after melt is filled up completely with slow type chamber, by of short duration pressurize, gas into Before core, drive mechanism driving cavity plate retreats rapidly, cooling foaming, because cavity pressure reduces rapidly, can improve multiple Cell nucleation problem in synthesis type foaming process, so as to improve the nucleation efficiencies of bubble, it can obtain with more preferable abscess Form and the product of distribution.The present invention is effectively raised in the foaming process of micropore injection moulding foaming and in-mold decoration composite molding The efficiency of nucleation, the cell morphology of product is improved, improve the quality of product.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the flow chart of the twice-die-opening technique of the present invention;
The structural representation of the twice-die-opening device of present invention when Fig. 2 is matched moulds;
Fig. 3 is the structural representation of the twice-die-opening device of the foaming stages present invention;
The structural representation of the twice-die-opening device of present invention when Fig. 4 is die sinking.
Wherein:1- punch-pin;2- polymer and blowing agent blends melt;3- films;4- cavity plates;5- parts.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not For limiting the present invention.
In the preferred embodiment, as shown in figs 2-4, it is a kind of to be answered for micropore injection moulding foaming and in-mold decoration The twice-die-opening device of synthesis type, the device include the punch-pin 1 and cavity plate 4 being oppositely arranged, and the device also includes built-in for mould The film 3 and drive mechanism (not illustrating in figure) of decorations, the fitting of film 3 are arranged on the inwall of cavity plate 4, and drive mechanism connects with cavity plate Connect, before filler, it is smaller than accessory size that drive mechanism driving cavity plate moves to cavity dimension, is melted in polymer and blowing agent blends Body 2 is injected after die cavity and before Gas nucleation, and drive mechanism drives cavity plate rapid backward to cavity dimension and accessory size one Cause, after the completion of the foaming of part 5, drive mechanism driving cavity plate retreats to take out part again.
In a preferred embodiment of the invention, polymer and blowing agent blends melt injection die cavity after and gas into Before core, drive mechanism drives cavity plate with 1mm/s-10mm/s speed rapid backward.
In a preferred embodiment of the invention, film is polyurethane film or polyethylene terephthalate thin film, typically For, the thickness of film is 0.1mm-0.3mm.
Accordingly, as shown in figure 1, the present invention also provide it is a kind of for micropore injection moulding foaming and in-mold decoration composite molding Twice-die-opening technique, comprises the following steps:
S1, the film for in-mold decoration being affixed on to cavity plate inwall, drive mechanism driving cavity plate motion carries out matched moulds, this When cavity dimension it is smaller than accessory size;
S2, the homogeneous system of supercritical fluid and polymer melt is injected into die cavity, after the completion of filling, continues to inject Polymer melt carries out pressurize;
After the completion of S3, pressurize, drive mechanism driving cavity plate rapid backward is consistent with accessory size to cavity dimension, and abscess is fast Fast nucleation and growth process, and carry out cooling and complete part foaming;
After the completion of S4, part foaming, drive mechanism driving cavity plate retreats to take out part again.
In a preferred embodiment of the invention, as shown in figure 1, in step s 2, the formation of homogeneous system includes following step Suddenly:Polymer raw material first is added to injection machine hopper, reheats plasticizing, while injects the gas of supercriticality as foaming Agent, the homogeneous system of supercritical fluid and polymer melt can be formed under the stirring of screw rod and shear action.
Three embodiments are exemplified below the present invention is further described.
Embodiment one
The size for the part to be made:A length of 40mm, a width of 30mm, thickness 20mm.Its foam device reference used Twice-die-opening device shown in Fig. 2, including film, the die cavity of injection molding and cavity plate for in-mold decoration, wherein cavity plate energy Moved backward with 10mm/s speed, the film used and tightly fits in cavity plate inwall for 0.3mm polyurethane film. As shown in figure 1, its manufacture craft comprises the following steps:
S1) pad pasting and matched moulds:By membrane shears into the shape as part outer surface, and it is affixed on cavity plate inwall, so Matched moulds afterwards, the size of the die cavity after matched moulds is long 40mm, a width of 30mm, thickness 15mm;
S2 homogeneous system) is formed:Polypropylene granules are added to injection machine hopper, then heating plasticizing, while inject super face The carbon dioxide of boundary's state stirring in screw rod, forms supercritical carbon dioxide as foaming agent under shear action With the homogeneous system of melt polypropylene;
S3) injection molding of polymers:The carbon dioxide of supercritical fluid and polyacrylic homogeneous system are passed through into mould gate, note Mold cavity is injected, after the completion of filling, continues injection of polymer melt and carries out pressurize, as shown in Figure 2;
S4) foam:After the completion of filling pressurize, cavity plate is moved backward with 10mm/s speed, and the size for making die cavity is part Size, the rapid nucleation and growth process of abscess, finally cool down, as shown in Figure 3;
S5 part) is taken out:After the completion of cooling, part foaming is completed, and cavity plate continues to retreat until that can take out part position, Part is then taken out, as shown in Figure 4.
Embodiment two
The part to be made is diameter 30mm, thickness 10mm disk, and its manufacture craft comprises the following steps:
S1) the shape for cutting into polyurethane film as part outer surface, and be affixed on cavity plate inwall, Ran Houhe Mould, the size of the die cavity after matched moulds is a diameter of 30mm, thickness 5mm;
S2 polyethylene pellet) is added to injection machine hopper, then heating plasticizing, while the nitrogen for injecting supercriticality is made For foaming agent, and stirring in screw rod, the homogeneous system that supercritical nitrogen and polyethylene melt are formed under shear action;
S3) homogeneous system of the nitrogen of supercritical fluid and polyethylene is injected into mold cavity, filled by mould gate After the completion of filling out, continue injection of polymer melt and carry out pressurize;
S4 after the completion of) filling pressurize, cavity plate is moved backward with 5mm/s speed, and the size for making die cavity is the size of part, Finally cool down;
S5) after the completion of cooling, part foaming is completed, and cavity plate continues to retreat until that can take out part position, then takes out Part.
Embodiment three
The part to be made is diameter 30mm, thickness 10mm disk.Its manufacture craft comprises the following steps:
S1) the shape for cutting into polyethylene terephthalate thin film as part outer surface, and be affixed in cavity plate On wall, then matched moulds, the size of the die cavity after matched moulds is a diameter of 30mm, thickness 5mm;
S2 polypropylene granules) are added to injection machine hopper, then heating plasticizing, while the nitrogen for injecting supercriticality is made For foaming agent, and stirring in screw rod, the homogeneous system that supercritical nitrogen and melt polypropylene are formed under shear action;
S3) nitrogen of supercritical fluid and polyacrylic homogeneous system are injected into mold cavity, filled by mould gate After the completion of filling out, continue injection of polymer melt and carry out pressurize;
S4 after the completion of) filling pressurize, cavity plate is moved backward with 10mm/s speed, and the size for making die cavity is the chi of part It is very little, finally cool down;
S5) after the completion of cooling, part foaming is completed, and cavity plate continues to retreat until that can take out part position, then takes out Part.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (6)

1. a kind of twice-die-opening device for micropore injection moulding foaming and in-mold decoration composite molding, the device includes being oppositely arranged Punch-pin and cavity plate, it is characterised in that the device also include for in-mold decoration film and drive mechanism, it is described film adhered It is arranged on the inwall of cavity plate, the drive mechanism is connected with cavity plate, and before filler, the drive mechanism driving cavity plate moves to type Chamber size is smaller than accessory size, described after polymer and blowing agent blends melt injection die cavity and before Gas nucleation Drive mechanism driving cavity plate rapid backward is consistent with accessory size to cavity dimension, after the completion of part foaming, the driving machine Structure driving cavity plate retreats to take out part again.
2. the twice-die-opening device according to claim 1 for micropore injection moulding foaming and in-mold decoration composite molding, its It is characterised by, after polymer and blowing agent blends melt injection die cavity and before Gas nucleation, the drive mechanism is driven Dynamic cavity plate is with 1mm/s-10mm/s speed rapid backward.
3. the twice-die-opening device according to claim 1 for micropore injection moulding foaming and in-mold decoration composite molding, its It is characterised by, the film is polyurethane film or polyethylene terephthalate thin film.
4. the twice-die-opening device for being used for micropore injection moulding foaming and in-mold decoration composite molding according to claim 1 or 3, Characterized in that, the thickness of the film is 0.1mm-0.3mm.
5. it is a kind of based on any one of claim 1-4 be used for micropore injection moulding foaming and in-mold decoration composite molding it is secondary The technique of die-sinking device, it is characterised in that comprise the following steps:
S1, the film for in-mold decoration is affixed on to cavity plate inwall, drive mechanism driving cavity plate motion carries out matched moulds, now type Chamber size is smaller than accessory size;
S2, the homogeneous system of supercritical fluid and polymer melt is injected into die cavity, after the completion of filling, continues injection polymerization Thing melt carries out pressurize;
After the completion of S3, pressurize, drive mechanism driving cavity plate rapid backward it is consistent with accessory size to cavity dimension, abscess rapidly into Core is grown up, and is carried out cooling and completed part foaming;
After the completion of S4, part foaming, drive mechanism driving cavity plate retreats to take out part again.
6. the twice-die-opening technique according to claim 5 for micropore injection moulding foaming and in-mold decoration composite molding, its It is characterised by, in step s 2, the formation of the homogeneous system comprises the following steps:It is former first polymer to be added to injection machine hopper Material, plasticizing is reheated, while inject the gas of supercriticality as foaming agent, under the stirring of screw rod and shear action Form the homogeneous system of supercritical fluid and polymer melt.
CN201710760542.2A 2017-08-30 2017-08-30 Twice-die-opening device and technique for micropore injection moulding foaming and in-mold decoration composite molding CN107379391A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107953500A (en) * 2017-12-14 2018-04-24 祥兴(福建)箱包集团有限公司 The method that physical blowing prepares microporous polycarbonate composite sheet
CN107984778A (en) * 2017-12-14 2018-05-04 祥兴(福建)箱包集团有限公司 The method that physical blowing prepares enhanced microporous polycarbonate composite sheet
CN108372619A (en) * 2018-02-10 2018-08-07 郑州大学 A kind of preparation process of injection moulding high density microcellular foam material
CN108638422A (en) * 2018-07-24 2018-10-12 江苏秦龙汽车科技有限公司 Method is molded using the microporous foam of mixed foaming agent and in-mold decoration composite molding
CN108638423A (en) * 2018-07-24 2018-10-12 江苏秦龙汽车科技有限公司 Using the microporous foam and in-mold decoration composite molding die-sinking device of mixed foaming agent
CN110142911A (en) * 2019-05-13 2019-08-20 山东大学 The injection molding apparatus and technique of a kind of polymer micro foamed material and its application

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101781406A (en) * 2009-09-25 2010-07-21 北京中拓机械有限责任公司 Thermoplastic elastomer skin product and production method thereof
CN104149258A (en) * 2014-07-04 2014-11-19 福州大学 Microcellular foaming and in-mold film lamination integrated process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101781406A (en) * 2009-09-25 2010-07-21 北京中拓机械有限责任公司 Thermoplastic elastomer skin product and production method thereof
CN104149258A (en) * 2014-07-04 2014-11-19 福州大学 Microcellular foaming and in-mold film lamination integrated process

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107953500A (en) * 2017-12-14 2018-04-24 祥兴(福建)箱包集团有限公司 The method that physical blowing prepares microporous polycarbonate composite sheet
CN107984778A (en) * 2017-12-14 2018-05-04 祥兴(福建)箱包集团有限公司 The method that physical blowing prepares enhanced microporous polycarbonate composite sheet
CN108372619A (en) * 2018-02-10 2018-08-07 郑州大学 A kind of preparation process of injection moulding high density microcellular foam material
CN108372619B (en) * 2018-02-10 2020-06-09 郑州大学 Preparation process of injection molding high-density microcellular foam material
CN108638422A (en) * 2018-07-24 2018-10-12 江苏秦龙汽车科技有限公司 Method is molded using the microporous foam of mixed foaming agent and in-mold decoration composite molding
CN108638423A (en) * 2018-07-24 2018-10-12 江苏秦龙汽车科技有限公司 Using the microporous foam and in-mold decoration composite molding die-sinking device of mixed foaming agent
CN110142911A (en) * 2019-05-13 2019-08-20 山东大学 The injection molding apparatus and technique of a kind of polymer micro foamed material and its application

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Application publication date: 20171124