CN108215052A - Prevent the method for liquid crystal polymer resin injection moulding process surface product defect - Google Patents
Prevent the method for liquid crystal polymer resin injection moulding process surface product defect Download PDFInfo
- Publication number
- CN108215052A CN108215052A CN201711489429.1A CN201711489429A CN108215052A CN 108215052 A CN108215052 A CN 108215052A CN 201711489429 A CN201711489429 A CN 201711489429A CN 108215052 A CN108215052 A CN 108215052A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- crystal polymer
- polymer resin
- resin injection
- moulding process
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 229920005989 resin Polymers 0.000 title claims abstract description 16
- 239000011347 resin Substances 0.000 title claims abstract description 16
- 229920000106 Liquid crystal polymer Polymers 0.000 title claims abstract description 14
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001746 injection moulding Methods 0.000 title claims abstract description 10
- 230000007547 defect Effects 0.000 title claims description 10
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000003672 processing method Methods 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 8
- 230000002950 deficient Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000005297 material degradation process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76595—Velocity
Abstract
In the product being molded the invention belongs to injection molding field more particularly to liquid crystal polymer.The technical problem to be solved by the present invention is to the conditions of the technique by adding in vacuum extractor in injection mold and with the use of setting, liquid crystal polymer resin product is made to eliminate the phenomenon that bulge is played on surface in injection moulding process, processing method is simplified, reduces cost, improves workpiece's qualification rate.
Description
Technical field
In the product being molded the invention belongs to injection molding field more particularly to liquid crystal polymer.
Background technology
Liquid crystal polymer resin is a kind of novel high-performance special engineering plastics to grow up the eighties in last century, melting
Liquid crystal liquid crystal property can be shown during state, it also has excellent chemical resistance, and thermal stability, heat resistance, electrical insulating property, creep is small,
The features such as wearability is higher, such as glass fibre, polytetrafluoroethylene (PTFE), carbon fiber additive are added in resin, it can greatly enhance
Properties of product, this material are widely used in the fields such as auto parts and components and office electronics, aerospace, but liquid crystal polymer resin
It is very easy to surface defect occur in injection moulding process for example to play bulge, influences product appearance and function.
In order to remove the product defects of surface bulge, domestic traditional method is is allowed to by adjusting gate location or quantity
Reach requirement, but setting gate location needs repeatedly to replace mold insert repeatedly, very waste of manpower and material resources, and without apparent rule
Rule property.
Invention content
In view of problem above point, the technical problem to be solved by the present invention is to inhale vacuum holding by being installed on plastic mould
It puts, coordinates adjusting process parameter, be allowed to meet surface requirements.
The invention solves technical problem the technical scheme adopted is that providing a kind of prevention liquid crystal polymer resin injection
The method of process surface product defect, specifically includes following operating procedure：
（1）Vacuum plant is inhaled in installation in mold cavity, is linked with injection molding machine, before resin injection, extraction type intracavity gas；
（2）Liquid crystal polymer resin sets 130 ± 5 DEG C using vacuum drier and drying temperature, and drying time sets 4 ± 1h；
（3）330 ~ 340 DEG C of molder nozzle temperature setting, 350 ± 5 DEG C of gun barrel temperature, 350 ± 5mm/sec of issuing velocity；
（4）Molding machine charging metering is set as maximum feed metering 30 ± 5%, and screw compression ratio is set as 1.7 ~ 2.2；
（5）120 ± 5 DEG C of metal die temperature cover half section sets, dynamic model part set 120 ~ 130 DEG C.
The beneficial effects of the invention are as follows：By installing vacuum extractor in injection mold and with the use of the technique of setting
Condition makes liquid crystal polymer resin product eliminate the phenomenon that bulge is played on surface in injection moulding process, simplifies processing method, reduces
Cost improves workpiece's qualification rate.
Description of the drawings
Below in conjunction with attached drawing, illustrated with embodiment.
Fig. 1 is that the reason of surface defects of products plays bulge is analyzed.
Fig. 2 is Product Process process.
Fig. 3 is the bulge data statistics of product difference injection parameters.
Specific embodiment
Describe the specific embodiment of invention in detail with reference to technology word and attached drawing.
Surface defects of products rise bulge the reason of be broadly divided into two kinds, the first has been bulge location rule, be mostly by
It is caused in product or mold structure defect, needs to adjust mold parting surface and cavity positions, change gate form, change mould type
Chamber material reaches and avoids the problem that surface defect plays bulge, and second has been that bulge position is irregular, and size is irregular, this master
If since 3 aspects cause,（1）Processing parameter setting is unreasonable, wherein comprising firing rate, pressure and gun barrel temperature and nozzle temperature
Degree.（2）Air is mixed into, and addition is needed, which to inhale vacuum plant or cavity, need to process rational air discharge duct.（3）Material degradation causes, and needs
Material is dried fully, drying time is reasonable, and molding machine metering will accurately (see Fig. 1).
The present embodiment is adopted as the female stub thread bars of liquid crystal polymer resin ACME STUB angstrom gram, and product weight is
1.0g, 1 mould, 4 cave, hot flow path is without regrinding-material handle.
Installation process is as follows, mold is mounted on molding machine, while liquid crystal polymer resin material is put into vacuum and is done
Dry machine is dried, and mold is inhaled vacuum plant is mounted on mold, and oil temperature machine is opened and dynamic model and cover half mould is set separately
Molding machine is heated up and reaches injecting condition, after mold actions opening and closing experiment is carried out after setting technological parameter, into die trial rank by temperature
Section (see Fig. 2).
Die trial process parameter adjustment is as follows（See Fig. 3）.
It is analyzed by 11 die trials, the use for inhaling vacuum plant is greatly improved to product surface bulge, fraction defective
Have dropped 5%, analyzed by die trial, resin material material drying time was more than 24 hours, it may occur that signs of degradation, fraction defective with
Raising, but by improving firing rate, improve gun barrel temperature, dynamic model mould temperature determine in raising, be also greatly improved to a bulge phenomenon from
12% fraction defective before, is adjusted to 0%, ensure that the surface quality requirements of product.
Claims (1)
1. prevent the method for liquid crystal polymer resin injection moulding process surface product defect, which is characterized in that specifically include following behaviour
Make step：
（1）Vacuum plant is inhaled in installation in mold cavity, is linked with injection molding machine, before resin injection, extraction type intracavity gas；
（2）Liquid crystal polymer resin sets 130 ± 5 DEG C using vacuum drier and drying temperature, and drying time sets 4 ± 1h；
（3）330 ~ 340 DEG C of molder nozzle temperature setting, 350 ± 5 DEG C of gun barrel temperature, 350 ± 5mm/sec of issuing velocity；
（4）Molding machine charging metering is set as maximum feed metering 30 ± 5%, and screw compression ratio is set as 1.7 ~ 2.2；
（5）120 ± 5 DEG C of metal die temperature cover half section sets, dynamic model part set 120 ~ 130 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711489429.1A CN108215052A (en) | 2017-12-30 | 2017-12-30 | Prevent the method for liquid crystal polymer resin injection moulding process surface product defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711489429.1A CN108215052A (en) | 2017-12-30 | 2017-12-30 | Prevent the method for liquid crystal polymer resin injection moulding process surface product defect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108215052A true CN108215052A (en) | 2018-06-29 |
Family
ID=62647529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711489429.1A Pending CN108215052A (en) | 2017-12-30 | 2017-12-30 | Prevent the method for liquid crystal polymer resin injection moulding process surface product defect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108215052A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669030A (en) * | 2018-12-28 | 2019-04-23 | 佛山科学技术学院 | A kind of industrial injecting products defect diagnostic method based on decision tree |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337048A (en) * | 1999-01-19 | 2002-02-20 | 纳幕尔杜邦公司 | Injection moldable conductive aromatic thermoplastic liquid crystalline polymeric compositions |
| CN1383397A (en) * | 2000-06-14 | 2002-12-04 | 旭化成株式会社 | Method of injection molding of thermoplastic resin |
| JP2004117544A (en) * | 2002-09-24 | 2004-04-15 | Nippon Zeon Co Ltd | Method for manufacturing light diffusing plate |
| CN2723167Y (en) * | 2004-08-26 | 2005-09-07 | 上海广电模塑有限公司 | Injection mold |
| CN101519498A (en) * | 2007-02-26 | 2009-09-02 | 住友化学株式会社 | Resin molded article and method for producing the same |
| TW201012845A (en) * | 2008-07-30 | 2010-04-01 | Dainippon Ink & Chemicals | Liquid crystal polymer and method for producing the same |
| CN102070879A (en) * | 2009-11-20 | 2011-05-25 | 住友化学株式会社 | Liquid crystalline resin composition and molded body thereof |
| CN102498171A (en) * | 2009-09-16 | 2012-06-13 | 吉坤日矿日石能源株式会社 | Method for molding liquid crystal polyester resin composition and molded body of liquid crystal polyester resin composition |
| CN102601928A (en) * | 2012-02-17 | 2012-07-25 | 增城市运豪五金塑料有限公司 | Fully sealed mold ultra-high vacuum die-casting and injection molding device and operation method |
| CN202507484U (en) * | 2012-04-16 | 2012-10-31 | 青岛伟胜电子塑胶有限公司 | Vacuumizing type mould |
| CN102766319A (en) * | 2011-03-30 | 2012-11-07 | 住友化学株式会社 | Liquid crystalline polymer molded article |
| CN105398018A (en) * | 2015-11-25 | 2016-03-16 | 无锡啄木鸟环保建材有限公司 | Production equipment and production process for novel multicolour wood-plastic composite material |
-
2017
- 2017-12-30 CN CN201711489429.1A patent/CN108215052A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337048A (en) * | 1999-01-19 | 2002-02-20 | 纳幕尔杜邦公司 | Injection moldable conductive aromatic thermoplastic liquid crystalline polymeric compositions |
| CN1383397A (en) * | 2000-06-14 | 2002-12-04 | 旭化成株式会社 | Method of injection molding of thermoplastic resin |
| JP2004117544A (en) * | 2002-09-24 | 2004-04-15 | Nippon Zeon Co Ltd | Method for manufacturing light diffusing plate |
| CN2723167Y (en) * | 2004-08-26 | 2005-09-07 | 上海广电模塑有限公司 | Injection mold |
| CN101519498A (en) * | 2007-02-26 | 2009-09-02 | 住友化学株式会社 | Resin molded article and method for producing the same |
| TW201012845A (en) * | 2008-07-30 | 2010-04-01 | Dainippon Ink & Chemicals | Liquid crystal polymer and method for producing the same |
| CN102498171A (en) * | 2009-09-16 | 2012-06-13 | 吉坤日矿日石能源株式会社 | Method for molding liquid crystal polyester resin composition and molded body of liquid crystal polyester resin composition |
| CN102070879A (en) * | 2009-11-20 | 2011-05-25 | 住友化学株式会社 | Liquid crystalline resin composition and molded body thereof |
| CN102766319A (en) * | 2011-03-30 | 2012-11-07 | 住友化学株式会社 | Liquid crystalline polymer molded article |
| CN102601928A (en) * | 2012-02-17 | 2012-07-25 | 增城市运豪五金塑料有限公司 | Fully sealed mold ultra-high vacuum die-casting and injection molding device and operation method |
| CN202507484U (en) * | 2012-04-16 | 2012-10-31 | 青岛伟胜电子塑胶有限公司 | Vacuumizing type mould |
| CN105398018A (en) * | 2015-11-25 | 2016-03-16 | 无锡啄木鸟环保建材有限公司 | Production equipment and production process for novel multicolour wood-plastic composite material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669030A (en) * | 2018-12-28 | 2019-04-23 | 佛山科学技术学院 | A kind of industrial injecting products defect diagnostic method based on decision tree |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180629 |
|
| RJ01 | Rejection of invention patent application after publication |