CN113752525A - Method for forming crystalline plastic - Google Patents
Method for forming crystalline plastic Download PDFInfo
- Publication number
- CN113752525A CN113752525A CN202010488566.9A CN202010488566A CN113752525A CN 113752525 A CN113752525 A CN 113752525A CN 202010488566 A CN202010488566 A CN 202010488566A CN 113752525 A CN113752525 A CN 113752525A
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- China
- Prior art keywords
- cooling
- molding
- temperature
- crystallization
- crystalline plastic
- 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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- 238000000034 method Methods 0.000 title claims abstract description 36
- 229920001887 crystalline plastic Polymers 0.000 title claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 238000000465 moulding Methods 0.000 claims abstract description 30
- 238000002425 crystallisation Methods 0.000 claims abstract description 22
- 230000008025 crystallization Effects 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000003856 thermoforming Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 description 11
- 239000005020 polyethylene terephthalate Substances 0.000 description 11
- 239000005457 ice water Substances 0.000 description 6
- -1 Polyethylene Polymers 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000071 blow moulding Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 229920006038 crystalline resin Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001161 mammalian embryo Anatomy 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention relates to a molding method of crystalline plastic, which comprises providing a raw material; performing a heating forming; performing a cooling crystallization; a cooling demoulding step is executed to form a crystalline plastic finished product, thereby, the effects of cooling crystallization and cooling demoulding in a mould can be achieved simultaneously by utilizing the staged cooling technology, so that an expensive cooling system is not needed, a crystallizer is not needed to be additionally built, the process yield can be improved, the cost expenditure of required equipment and manpower is reduced, and the total process time can be greatly reduced.
Description
Technical Field
The invention belongs to a molding technology of crystalline plastic, in particular to a molding method of crystalline plastic capable of being molded in a die once, which can reduce the molding equipment and labor cost, accelerate the molding speed and further improve the molding yield.
Background
Crystalline materials such as containers made of Polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), Polyphenylene Sulfide (PS), etc., wherein PET has an excellent gas barrier property; pressure resistance, creep resistance; impact resistance; transparency, surface gloss; no odor and fragrance; and accords with the safety of food hygiene, and simultaneously has beautiful appearance and easy forming, thereby being widely applied to food containers, such as commonly known as PET bottles.
PET is a high molecular polymer, and the most important characteristic is its molecular weight, which is the uniform molecular number of PET molecular chains, and the longer the number of molecular chain linkages, the better the physical properties of PET. And PET is crystalline resin with a specific gravity of about 1.4, a melting point of 245 ℃, and a molding temperature of about 290-315 ℃. Therefore, in the case of in-mold molding, as shown in FIG. 1, first, formation of a preform is performed. Then, the preform is heated to a molding temperature (e.g., 290 ℃ to 315 ℃) and then expanded in a mold to a predetermined size by a blow molding technique. And then, cooling and demoulding are carried out, wherein the mould is cooled to normal temperature (such as 20-30 ℃) by using an ice water system arranged in the mould, so that demoulding of the formed body is facilitated. Then, heating up for crystallization, and in order to improve the strength of the molded body, placing the molded body which is demoulded and cooled to normal temperature into a crystallizer, heating up to the crystallization temperature (such as 150 ℃ -170 ℃) again, crystallizing and shaping the molded body which is not crystallized, finally, cooling down for shaping, and after the crystallization of the molded body is completed again, cooling down to normal temperature again for forming the complete carrier.
In the common method for molding crystalline plastics, the mold is cooled by an ice water system to be quickly cooled to normal temperature for demolding, and a crystallizer is additionally used for heating to perform crystallization and shaping. However, the mold design difficulty of the ice water system is high, the construction cost is high, and a crystallizer needs to be additionally constructed, so that the space is occupied, the overall equipment cost is greatly increased, the continuous temperature rise and reduction is also carried out, the processing time is prolonged, even defective products are possibly formed, the whitening phenomenon is formed on the surface of a finished product of a formed body, and the attractiveness of the product is damaged.
In other words, since the conventional crystalline plastic has problems of high facility and labor costs, long process time, and high defective rate due to the effects of multiple temperature increases and decreases and mold release during molding, it is expected in the industry that the present invention also solves the problems of the injection and crystallization.
Accordingly, the present inventors have made extensive studies on the problems of the existing crystalline plastics, and have made extensive and diligent efforts to improve and try the present technology development, so as to successfully develop a method for molding crystalline plastics, which overcomes the disadvantages and inconveniences of the existing method, such as high equipment and labor costs and long process time due to temperature rise and drop.
Disclosure of Invention
Therefore, the present invention is directed to a method for molding crystalline plastic, which can simplify the process, effectively shorten the overall process time, and improve the molding yield.
Another objective of the present invention is to provide a method for molding crystalline plastic, which can reduce the cost of equipment installation and further save the equipment space and manpower.
In order to achieve the above object, the present invention provides a method for molding a crystalline plastic, comprising:
firstly, providing raw materials;
then, performing thermoforming: heating the raw materials to a forming temperature, and forming a product in a mould by the raw materials;
and then, cooling and crystallizing: after molding, cooling the mold to a crystallization temperature to crystallize and shape a product which is not crystallized; and
finally, cooling and demolding: after the cooling crystallization of the product is finished, the mold is further cooled to normal temperature, so that the demolding after molding is facilitated.
Therefore, through the concrete realization of the technical means, the forming method of the crystalline plastic achieves the effects of cooling crystallization and cooling demoulding by utilizing the step-type cooling technology, so that an expensive ice water system is not needed, a crystallizer is not needed to be additionally built, the process yield can be improved, the cost expenditure of required equipment and manpower is reduced, the process time can be greatly reduced, the added value is improved, and the economic benefit is further improved.
The invention further realizes the purposes and effects by the following technical means; such as:
the raw material can be a PET bottle blank, the heating forming temperature of the PET bottle blank is 290-315 ℃, the crystallization temperature is 120-220 ℃, and the crystallization temperature lasts for 1-10 minutes.
The invention has the beneficial effects that:
the invention provides a method for molding crystalline plastic, which utilizes a staged cooling technology to achieve the effects of cooling crystallization and cooling demolding, so that an expensive ice water system is not needed, a crystallizer is not needed to be additionally built, the equipment cost is effectively reduced, the process is simplified, the labor and the process time are saved, the process yield is improved, the efficiency and the product quality are greatly improved, the use site space is effectively saved, the turnover rate of raw materials, finished products and funds is effectively improved, the profit and the competitiveness are greatly improved, and the economic benefit utilized in the industry can be really met.
Drawings
FIG. 1 is a schematic flow chart of a conventional process for molding crystalline plastics.
FIG. 2 is a schematic flow chart of a molding method of crystalline plastic according to the present invention.
Detailed Description
To further clarify the structure, characteristics and other objects of the present invention, a preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings, and to enable those skilled in the art to practice the invention.
The present invention is a molding method of crystalline plastic, and the accompanying drawings illustrate specific embodiments and components thereof, all references relating to front and back, left and right, top and bottom, upper and lower, and horizontal and vertical are only used for convenience of description, and do not limit the present invention, nor limit the components thereof to any position or spatial orientation. The dimensions specified in the figures and description may vary depending on the design and requirements of particular embodiments of the invention without departing from the scope of the claims.
The method for molding crystalline plastic of the present invention, as shown in FIG. 2, comprises providing a raw material; performing a heating forming; performing a cooling crystallization; and executing a cooling demoulding step and the like. Forming a crystalline plastic product;
the detailed description of the forming method of the present invention is shown in FIG. 2, and PET bottle blowing is used as the main embodiment;
firstly, providing raw materials: such as pre-forming a bottle blank;
then, performing thermoforming: heating a bottle blank to a molding temperature (such as 290-315 ℃), and then expanding the bottle blank into a bottle body with a preset size in a mold by a bottle blowing technology;
and then, cooling and crystallizing: after the bottle embryo is formed into a bottle body by blow molding, the temperature is reduced to a crystallization temperature (such as 120-220 ℃) by using a temperature control machine which is a mold, and the crystallization temperature is kept for 1-10 minutes, so that the bottle body which is not crystallized and shaped is crystallized; and
finally, cooling and demolding: after the temperature reduction and crystallization of the bottle body are finished, the temperature of the mold is further reduced to normal temperature (such as 20-30 ℃) so as to be beneficial to demolding the molded bottle body and form the complete bottle body.
It can be seen from the above description that the method for molding crystalline plastic of the present invention utilizes a staged cooling technique to achieve the effects of cooling crystallization and cooling demolding, so that an expensive ice water system is not required, and a crystallizer is not required to be additionally installed, thereby effectively reducing the equipment cost, simplifying the process, saving the manpower and the process time, increasing the process yield, greatly increasing the efficiency and efficiency, greatly improving the product quality, effectively saving the space of the use site, effectively increasing the turnover rate of raw materials, finished products and capital, greatly improving the profit and competitiveness, and indeed meeting the economic benefits of industrial utilization.
In view of the above, it can be understood that the present invention is an excellent invention, which not only effectively solves the problems in the prior art and greatly improves the efficacy, but also does not find the same or similar product creation or public use in the same technical field and has an improvement in the efficacy, so that the present invention meets the requirements of novelty and advancement of the patent, and the patent application is legally proposed.
Claims (2)
1. A method for molding a crystalline plastic, comprising:
firstly, providing raw materials;
then, performing thermoforming: heating the raw materials to a forming temperature, and forming a product in a mold by the raw materials;
and then, cooling and crystallizing: after molding, cooling the mold to a crystallization temperature to crystallize and shape a product which is not crystallized; and
finally, cooling and demolding: after the cooling crystallization of the product is finished, the mold is further cooled to normal temperature, so that the demolding after molding is facilitated.
2. The method for molding crystalline plastic as claimed in claim 1, wherein the raw material is a PET bottle preform, the temperature for thermal molding is 290-315 ℃, the temperature for crystallization is 120-220 ℃, and the temperature for crystallization lasts 1-10 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010488566.9A CN113752525A (en) | 2020-06-02 | 2020-06-02 | Method for forming crystalline plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010488566.9A CN113752525A (en) | 2020-06-02 | 2020-06-02 | Method for forming crystalline plastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113752525A true CN113752525A (en) | 2021-12-07 |
Family
ID=78782330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010488566.9A Pending CN113752525A (en) | 2020-06-02 | 2020-06-02 | Method for forming crystalline plastic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113752525A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5833431A (en) * | 1981-07-31 | 1983-02-26 | エメリイ・アイ・ヴアリイ | Method of forming hollow article orientation-treated |
| CN101274473A (en) * | 2008-05-08 | 2008-10-01 | 张锡卿 | Method for producing environment protection container |
| CN101554763A (en) * | 2008-04-10 | 2009-10-14 | 鸿福鑫有限公司 | Polylactic acid forming body and making method thereof |
| TW200942401A (en) * | 2008-04-03 | 2009-10-16 | Hung Fu Xin Co Ltd | Polylactic acid forming body and the manufacturing method thereof |
| TW201221335A (en) * | 2010-11-30 | 2012-06-01 | Bottle Top Dev Co | Method for crystallization on thin wall port |
| CN103831966A (en) * | 2014-03-07 | 2014-06-04 | 杭州曦茂新材料科技有限公司 | Method for manufacturing heat-resistance polylactic acid water bottle |
| CN108588508A (en) * | 2018-07-03 | 2018-09-28 | 如皋市欧马机械制造有限公司 | A kind of durable use for diesel engine sealing element |
| CN210061763U (en) * | 2018-12-05 | 2020-02-14 | 佛山市顺德区高洁丽塑料包装有限公司 | Injection molding machine for producing high-temperature-resistant plastic bottles |
-
2020
- 2020-06-02 CN CN202010488566.9A patent/CN113752525A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5833431A (en) * | 1981-07-31 | 1983-02-26 | エメリイ・アイ・ヴアリイ | Method of forming hollow article orientation-treated |
| TW200942401A (en) * | 2008-04-03 | 2009-10-16 | Hung Fu Xin Co Ltd | Polylactic acid forming body and the manufacturing method thereof |
| CN101554763A (en) * | 2008-04-10 | 2009-10-14 | 鸿福鑫有限公司 | Polylactic acid forming body and making method thereof |
| CN101274473A (en) * | 2008-05-08 | 2008-10-01 | 张锡卿 | Method for producing environment protection container |
| TW201221335A (en) * | 2010-11-30 | 2012-06-01 | Bottle Top Dev Co | Method for crystallization on thin wall port |
| CN103831966A (en) * | 2014-03-07 | 2014-06-04 | 杭州曦茂新材料科技有限公司 | Method for manufacturing heat-resistance polylactic acid water bottle |
| CN108588508A (en) * | 2018-07-03 | 2018-09-28 | 如皋市欧马机械制造有限公司 | A kind of durable use for diesel engine sealing element |
| CN210061763U (en) * | 2018-12-05 | 2020-02-14 | 佛山市顺德区高洁丽塑料包装有限公司 | Injection molding machine for producing high-temperature-resistant plastic bottles |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20211207 |
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