CN103481437A - Molding method of PCTG (Poly(cyclohexylene dimethylene terephthalate)-Glycol modified polyester) copolyester container - Google Patents
Molding method of PCTG (Poly(cyclohexylene dimethylene terephthalate)-Glycol modified polyester) copolyester container Download PDFInfo
- Publication number
- CN103481437A CN103481437A CN201310353927.9A CN201310353927A CN103481437A CN 103481437 A CN103481437 A CN 103481437A CN 201310353927 A CN201310353927 A CN 201310353927A CN 103481437 A CN103481437 A CN 103481437A
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- China
- Prior art keywords
- pctg
- copolyester
- temperature
- pctg copolyester
- container
- 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.)
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Links
- 229920001634 Copolyester Polymers 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000000465 moulding Methods 0.000 title abstract 3
- -1 Poly(cyclohexylene dimethylene terephthalate Chemical compound 0.000 title abstract 2
- 229920000728 polyester Polymers 0.000 title abstract 2
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 238000001035 drying Methods 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 235000015111 chews Nutrition 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 206010013786 Dry skin Diseases 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012691 depolymerization reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- 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
- B29C2945/76655—Location of control
- B29C2945/76732—Mould
- B29C2945/76735—Mould cavity
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
The invention relates to a molding method of a PCTG (Poly(cyclohexylene dimethylene terephthalate)-Glycol modified polyester) copolyester container. The method comprises the steps of adding a PCTG copolyester raw material into an injection molding machine to melt the raw material; and then, injecting the melted PCTG copolyester into a mould cavity of a mould, cooling and molding, and especially controlling the temperature of the mould cavity to be below 35 DEG C. The PCTG copolyester container obtained by the method has excellent impact strength and good dropping resistance.
Description
Technical field
The present invention relates to a kind of forming method of PCTG copolyester container.
Background technology
Copolyester is the macromolecular material that a kind of crystallization is slow, transparency is high, as PCTG, PCT etc., not only there is excellent resistance to chemical corrosion, and there is higher impact strength, therefore PCTG is widely used in packaging field, as cosmetic packaging bottle, and the dirt bucket of dust catcher, cleaner solution tank etc.No matter the PCTG material, in the application process of dust catcher, cleaner, is dirt bucket or solution tank, and the requirement of drop test is arranged, and especially the drop test of solution tank, require PCTG to have better impact strength.
In prior art, the forming method of PCTG copolyester container is: dry PCTG copolyester is joined to melting in injection machine, then the PCTG copolyester of melting is injected to mould cavity, cooling forming.Wherein, about the processing temperature setting of injection machine, what EASTMAN company was recommended is 249 ℃～271 ℃, and the processing temperature that SK company is recommended is chewed 245 ℃ of temperature, 245 ℃ of the anterior temperature of barrel, 245 ℃ of the temperature in barrel middle part, 210 ℃ of barrel rear part temperatures for penetrating.About the mould cavity temperature, the material supplier recommends 50 ℃.According to existing forming method and condition, the impact strength of prepared PCTG copolyester container is poor, is difficult for maybe can not passing through the requirement of container drop test.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and a kind of forming method of improved PCTG copolyester container is provided, and the method gained container has excellent impact strength, and anti-dropping capability is good.
For solving the problems of the technologies described above, the present invention takes following technical scheme:
A kind of forming method of PCTG copolyester container, it is that PCTG copolyester raw material is joined to melting in injection machine, then the PCTG copolyester of melting is injected to mould cavity, cooling forming particularly, is controlled the temperature of die cavity below 35 ℃.
Preferably, the temperature in controlling diaphragm chamber is between 10 ℃～35 ℃.More preferably, the temperature in controlling diaphragm chamber is between 25 ℃～35 ℃.
What preferably, the mould of PCTG copolyester adopted drop gate (style big water gap) advances the glue mode; What should not adopt hot runner advances the glue mode, because the lasting melting high temperature of hot runner can make PCTG that serious degraded occurs, thereby reduces the impact strength of PCTG copolyester.Further, injection machine of the present invention can be commonly used those in this area.Injection machine adopts the Universal screw rod model: screw compression is than being 2.5:1～3.5:1, and L/D is 18:1～20:1.
Preferably, the processing temperature of injection machine is set as penetrating and chews 235 ± 2 ℃ of the anterior temperature of 265 ± 2 ℃ of temperature, barrel, 225 ± 2 ℃ of the temperature in barrel middle part, 215 ± 2 ℃ of barrel rear part temperatures.Under this processing conditions, the PCTG container has higher impact strength.
Water content when according to a preferred aspect of the present invention, described PCTG copolyester raw material joins injection machine is below 0.03wt%.
According to a concrete aspect: before in PCTG copolyester raw material is put into to injection machine, make the vacuum drier inner drying 4～6 hours that PCTG copolyester raw material is 65 ℃～75 ℃ at Temperature Setting.
According to another concrete aspect: before in PCTG copolyester raw material is put into to injection machine, first make the vacuum drier inner drying 4～6 hours that PCTG copolyester raw material is 65 ℃～75 ℃ at Temperature Setting, and then keep dry state in the input dehumidifying heat pump, automatically join in injection machine finally by dehumidifying heat pump, remain on below 0.03wt% thereby control water content always.
Preferably, the Temperature Setting of vacuum drier is 70 ℃～72 ℃.Traditional employing dehumidifying heat pump carries out dry method to the PCTG copolyester, can't reach and make in the PCTG copolyester water content below 0.03wt%.And show through inventor's lot of experiments, if PCTG copolyester raw material water content is below 0.03wt%, its depolymerization under molten condition is fainter, impact resistance to container does not have much affect, if PCTG copolyester water content is higher than 0.03wt%, depolymerization reaction will occur rapidly in it under molten condition, and the shock resistance of final container is caused to adverse effect.
According to the present invention, described PCTG copolyester raw material be this area for the preparation of container normal the employing, commercially available acquisition.Commercially available PCTG can meet the demands, the typical trade mark: the JN200 of SK company, the DN011 of Yi Shi Man.
Due to the enforcement of above technical scheme, the present invention compared with prior art has following advantage:
The PCTG copolyester container of taking the inventive method to obtain has excellent impact strength, and anti-drop is good.
The accompanying drawing explanation
The impact strength that Fig. 1 is PCTG copolyester container and the relation curve of mould-cavity temperature;
The relation curve of the impact strength that Fig. 2 is PCTG copolyester container and PCTG copolyester moisture content.
The specific embodiment
Embodiment 1
The present embodiment provides a kind of forming method of PCTG copolyester container, its technical process is as follows: by PCTG copolyester (JN200 of SK company) through vacuum drier (HASUCDZF-6500) 5h, after 70 ℃ of dryings, the input dehumidifying heat pump keeps dry state, automatically add injection machine (sea day injection machine) melting through dehumidifying heat pump, inject mould cavity by injection machine, cooling forming, wherein the processing temperature of injection machine is set as penetrating and chews 235 ℃ of the anterior temperature of 265 ℃ of temperature, barrel, 225 ℃ of the temperature in barrel middle part, 215 ℃ of barrel rear part temperatures.The mould cavity temperature is controlled at 34 ℃～35 ℃.
Embodiment 2
The present embodiment provides a kind of forming method of PCTG copolyester container, its technical process is as follows: by PCTG copolyester (JN200 of SK company) through vacuum drier (HASUCDZF-6500) 5h, after 70 ℃ of dryings, the input dehumidifying heat pump keeps dry state, automatically add injection machine (sea day injection machine) melting through dehumidifying heat pump, inject mould cavity by injection machine, cooling forming, wherein the processing temperature of injection machine is set as penetrating and chews 235 ℃ of the anterior temperature of 265 ℃ of temperature, barrel, 225 ℃ of the temperature in barrel middle part, 215 ℃ of barrel rear part temperatures.The mould cavity temperature is controlled at 25 ℃.
Embodiment 3
The present embodiment provides a kind of forming method of PCTG copolyester container, its technical process is as follows: by PCTG copolyester (JN200 of SK company) through vacuum drier (HASUCDZF-6500) 5h, after 70 ℃ of dryings, drop into dehumidifying heat pump keep dry state (in the PCTG copolyester, water content is below 0.03wt%), automatically add injection machine (sea day injection machine) melting through dehumidifying heat pump, inject mould cavity by injection machine, cooling forming, wherein the processing temperature of injection machine is set as penetrating and chews 265 ℃ of temperature, 235 ℃ of the anterior temperature of barrel, 225 ℃ of barrel middle part temperature, 215 ℃ of barrel rear part temperatures.The mould cavity temperature is controlled at 10 ℃.
Comparative Examples 1
The present embodiment provides a kind of forming method of PCTG copolyester container, and it is substantially with embodiment 1, different, and the mould cavity temperature is controlled at 38 ℃～39 ℃.
Comparative Examples 2
The present embodiment provides a kind of forming method of PCTG copolyester container, and it is substantially with embodiment 1, different, and the mould cavity temperature is controlled at 50 ℃.
Comparative Examples 3
The present embodiment provides a kind of forming method of PCTG copolyester container, and it is substantially with embodiment 1, different, and the mould cavity temperature is controlled at 55 ℃.
Comparative Examples 4
The present embodiment provides a kind of forming method of PCTG copolyester container, and it is substantially with embodiment 1, different, and the mould cavity temperature is controlled at 60 ℃.
Comparative Examples 5
This example provides a kind of forming method of PCTG copolyester container, its technical process is as follows: PCTG copolyester (JN200 of SK company) is dropped into to dehumidifying heat pump dry (after the dehumidifying heat pump drying, in the PCTG copolyester, water content is about 0.07wt%), automatically add injection machine (sea day injection machine) melting through dehumidifying heat pump, inject mould cavity by injection machine, cooling forming, wherein the processing temperature of injection machine is set as penetrating and chews 235 ℃ of the anterior temperature of 265 ℃ of temperature, barrel, 225 ℃ of the temperature in barrel middle part, 215 ℃ of barrel rear part temperatures.The mould cavity temperature is controlled at 34 ℃～35 ℃.
Comparative Examples 6～9
Comparative Examples 6～9 provides respectively the forming method of PCTG copolyester container, and they are substantially with embodiment 1, different, and they make the drying condition difference of PCTG copolyester in vacuum drier.Specifically, the drying condition of Comparative Examples 6 is: 70 ℃, and 4.5h; The drying condition of Comparative Examples 7 is 70 ℃; 3.5h; The drying condition of Comparative Examples 8 is 70 ℃, 3h; The drying condition of Comparative Examples 9 is 70 ℃, 2.5h.The water content (or claiming moisture content) that enters into the PCTG copolyester of injection machine in Comparative Examples 6～9 is respectively 0.04wt%, 0.06wt%, 0.08wt%, 0.10wt%.
the impact strength test
1) method of testing: the plate part of container is made to test bars, use impact tester for simple supported beam to carry out the impact strength test to sample, calculate the impact strength of sample according to be thrust absorbed energy and the ratio of original cross section of sample, if sample can't be thrust explanation, impact strength reaches maximum, reach requirement, can pass through the container drop test.
2) test condition: the batten size adopts GB:80*10mm, and breach is 2mm; Shock machine adopts impact tester for simple supported beam.
3) test bars mode, make test bars by the plate part of the container of embodiment 1～3 and Comparative Examples 1～9.
4) test result:
The test result of embodiment 1～3 and Comparative Examples 1～4 is depicted as curve, referring to Fig. 1.
The test result of embodiment 1, Comparative Examples 5～9 is depicted as curve, referring to Fig. 2.
As seen from Figure 1, at the PCTG moisture content, when 0.03wt% is following, the mould cavity temperature is below 35 ℃ the time, and the shock-testing of container is fracture not.When mold temperature, during between 35 ℃～42 ℃, the container impact strength descends rapidly, and when the mould cavity temperature surpasses 42 ℃, container can not pass through drop test.
As seen from Figure 2, when the mould cavity temperature is 35 ℃, when the PCTG moisture content, when 0.03wt% is following, the impact strength of container is tested not fracture.Illustrate when PCTG raw material moisture content when 0.03wt% is following, container has stronger impact property, and when PCTG raw material moisture content during between 0.03wt%～0.05wt%, the container impact strength descends rapidly, when PCTG raw material moisture content surpasses 0.05%wt, container can not pass through drop test.
Above the present invention is described in detail; its purpose is to allow the personage who is familiar with this art can understand content of the present invention and be implemented; can not limit the scope of the invention with this; and the invention is not restricted to the embodiments described; the equivalence that all Spirit Essences according to the present invention are done changes or modifies, and all should be encompassed in protection scope of the present invention.
Claims (10)
1. the forming method of a PCTG copolyester container, it is that PCTG copolyester raw material is joined to melting in injection machine, then the PCTG copolyester of melting is injected to mould cavity, cooling forming is characterized in that: control the temperature of die cavity below 35 ℃.
2. the forming method of PCTG copolyester container according to claim 1, it is characterized in that: the temperature in controlling diaphragm chamber is between 10 ℃～35 ℃.
3. the forming method of PCTG copolyester container according to claim 2, it is characterized in that: the temperature in controlling diaphragm chamber is between 25 ℃～35 ℃.
4. the forming method of PCTG copolyester container according to claim 1 is characterized in that: what the mould of described PCTG copolyester container adopted drop gate advances the glue mode.
5. the forming method of PCTG copolyester container according to claim 1 is characterized in that: the processing temperature of injection machine is set as penetrating chews 265 ± 2 ℃ of temperature, 235 ± 2 ℃ of the anterior temperature of barrel, 225 ± 2 ℃ of the temperature in barrel middle part, 215 ± 2 ℃ of barrel rear part temperatures.
6. the forming method of PCTG copolyester container according to claim 1, it is characterized in that: the water content in described PCTG copolyester raw material is below 0.03wt%.
7. the forming method of PCTG copolyester container according to claim 6, it is characterized in that: before in PCTG copolyester raw material is put into to injection machine, make the vacuum drier inner drying 4～6 hours that PCTG copolyester raw material is 65 ℃～75 ℃ at Temperature Setting.
8. the forming method of PCTG copolyester container according to claim 6, it is characterized in that: before in PCTG copolyester raw material is put into to injection machine, first make the vacuum drier inner drying 4～6 hours that PCTG copolyester raw material is 65 ℃～75 ℃ at Temperature Setting, and then keep dry state in the input dehumidifying heat pump, finally by dehumidifying heat pump, automatically join in injection machine.
9. according to the forming method of the described PCTG copolyester of claim 7 or 8 container, it is characterized in that: the Temperature Setting of vacuum drier is 70 ℃～72 ℃.
10. according to the forming method of the described PCTG copolyester of claim 7 or 8 container, it is characterized in that: be 5～6h the drying time of vacuum drier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310353927.9A CN103481437B (en) | 2013-08-14 | 2013-08-14 | A kind of forming method of PCTG copolyester container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310353927.9A CN103481437B (en) | 2013-08-14 | 2013-08-14 | A kind of forming method of PCTG copolyester container |
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| CN103481437A true CN103481437A (en) | 2014-01-01 |
| CN103481437B CN103481437B (en) | 2016-05-04 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040228993A1 (en) * | 2000-12-08 | 2004-11-18 | Stephen Weinhold | Polyester compositions for hot-fill containers |
| JP2010030251A (en) * | 2008-07-31 | 2010-02-12 | Yoshino Kogyosho Co Ltd | Synthetic resin-made container and method for molding the same |
| CN101664994A (en) * | 2009-09-24 | 2010-03-10 | 贵州千叶塑胶有限公司 | Method for manufacturing highly heat resistant wide-mouth polyester container |
| CN102947071A (en) * | 2010-06-23 | 2013-02-27 | 宝洁公司 | High velocity injection molded product |
-
2013
- 2013-08-14 CN CN201310353927.9A patent/CN103481437B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040228993A1 (en) * | 2000-12-08 | 2004-11-18 | Stephen Weinhold | Polyester compositions for hot-fill containers |
| JP2010030251A (en) * | 2008-07-31 | 2010-02-12 | Yoshino Kogyosho Co Ltd | Synthetic resin-made container and method for molding the same |
| CN101664994A (en) * | 2009-09-24 | 2010-03-10 | 贵州千叶塑胶有限公司 | Method for manufacturing highly heat resistant wide-mouth polyester container |
| CN102947071A (en) * | 2010-06-23 | 2013-02-27 | 宝洁公司 | High velocity injection molded product |
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| CN103481437B (en) | 2016-05-04 |
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Address after: 215168 Wuzhong District, Jiangsu, Stone Lake Road West, No. 108 Applicant after: Ecovacs Robot Co., Ltd. Address before: 215168 Wuzhong District, Jiangsu, Stone Lake Road West, No. 108 Applicant before: ECOVACS ELECTRICAL CO., LTD. |
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Address after: 215168 Wuzhong District, Jiangsu, Stone Lake Road West, No. 108 Patentee after: Ecovacs robot Limited by Share Ltd Address before: 215168 Wuzhong District, Jiangsu, Stone Lake Road West, No. 108 Patentee before: Ecovacs Robot Co., Ltd. |