CN115972549A - PET bottle processing technology - Google Patents
PET bottle processing technology Download PDFInfo
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- CN115972549A CN115972549A CN202310008915.6A CN202310008915A CN115972549A CN 115972549 A CN115972549 A CN 115972549A CN 202310008915 A CN202310008915 A CN 202310008915A CN 115972549 A CN115972549 A CN 115972549A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a PET bottle processing technology, which comprises the following steps: blending raw materials: stirring the polyethylene terephthalate, the recovered fragments and the additives by using a stirrer, and drying the raw materials by using a dryer; forming a bottle blank: introducing the raw materials into a charging barrel of an injection molding machine, molding by the injection molding machine and cooling to obtain a tubular bottle blank; heating the bottle blank: heating the bottle blank to a stretch-deformable temperature and conveying the bottle blank to a blow molding machine; it is tensile, low pressure is blown in advance, high pressure blow makes the bottle embryo contact with the mould inner wall completely, cooling design and quality control, carry out the normal atmospheric temperature to the bottle embryo after injection moulding and deposit aging treatment, reduce the stress that produces when the bottle embryo moulds plastics, later preheat the bottle embryo through the oven, further eliminate stress, simultaneously for the condition that the tensile provides plasticity, divide into low pressure and blow molding two steps of stereotyping with high pressure blow with the blowing, lead to the uneven problem of bottle wall thickness expansion easily when reducing instantaneous blow molding, reduce the problem that the bottle was torn.
Description
Technical Field
The invention relates to the field of PET bottle processing, in particular to a PET bottle processing technology.
Background
Most of the existing PET bottles are directly sent into a bottle blowing machine for blow molding after being formed into bottle blanks by injection molding of an injection molding machine.
However, the raw materials of the bottle blank are mixed by a plurality of substances, after the injection molding stage is completed, the stability of the bottle blank after injection molding is poor due to rapid cooling and the difference of the fusion properties of the mixed materials of all parts, and more stress exists at the turning part.
Disclosure of Invention
The invention aims to provide a PET bottle processing technology to solve the problems mentioned in the background technology.
A PET bottle processing technology comprises the following steps:
s1, blending raw materials: mixing polyethylene terephthalate with the recovered fragments, adding an additive, stirring by using a stirrer, and drying the raw materials by using a dryer;
s2, forming of bottle blanks: introducing the raw material obtained in the step S1 into a charging barrel of an injection molding machine, molding and cooling the raw material by the injection molding machine to obtain a tubular bottle blank, and storing the tubular bottle blank for more than 48 hours;
s3, heating bottle blanks: conveying the bottle blanks through an oven by conveying equipment, heating the bottle blanks to a temperature capable of stretching and deforming, and conveying the bottle blanks to a blow molding machine;
s4, stretching and low-pressure pre-blowing: placing the bottle blank heated to the plasticity temperature in the step S3 into a mold of a blow molding machine, stretching the bottle blank by using a stretching mandrel, and pre-blowing low-pressure air into the bottle to expand the bottle blank;
s5, high-pressure blow molding; increasing the air pressure of the blow molding machine to ensure that the bottle blank is completely contacted with the inner wall of the mold;
s6, cooling and shaping: cooling water circulation in the mold is utilized to take away the heat of the mold, and the temperature of the mold is reduced to room temperature to obtain a final bottle body;
s7, quality inspection: and randomly sampling the molded bottle body for quality detection, measuring the thickness of the bottle body, carrying out a compression experiment for detecting the strength of the bottle body, and then carrying out a vacuum pressure experiment.
Preferably, the content of the recovered fragments is 10%, and the additives are 0.5% -2% of mica sheets, 0.1% -0.2% of transparent setting agent and 0.2% -0.4% of PET toughening agent; in the S1, the drying temperature is 140-180 ℃, and the drying time is 3-4 hours.
Preferably, the barrel temperature is 280 to 300 ℃, and the injection molding machine nozzle temperature is 10 to 15 ℃ lower than the barrel temperature.
Preferably, the oven temperature is 130-150 ℃, and the baking time is 3-5 s.
Preferably, the stretching speed of the stretching mandrel in the S4 is controlled to be 1-1.4m/S, and low-pressure gas of 1-1.2 MPa is pre-blown until the bottom of the bottle blank is contacted with the bottom of the mold, so that the bottle blank is expanded to 75% of deformation.
Preferably, the air pressure of the S5 high-pressure blow molding is 4MPa-6MPa, and the dwell time is 2S-3S.
The invention has the advantages that: carry out the normal atmospheric temperature to the bottle embryo after the injection moulding and deposit aging treatment, reduce the stress that produces when the bottle embryo moulds plastics, later preheat the bottle embryo through the oven, further eliminate stress, for the condition that tensile provides plasticity, divide into low pressure preblowing and two steps of high-pressure blow molding design with the blow molding simultaneously, lead to the uneven problem of bottle wall thickness expansion easily when reducing instantaneous blow molding, reduce the torn problem of bottle.
Drawings
FIG. 1 is a flow chart of the processing technique of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
A PET bottle processing technology comprises the following steps:
step 1, blending raw materials: mixing polyethylene terephthalate with the recovered fragments, adding an additive, stirring by using a stirrer, and drying the raw materials by using a dryer;
step 2, forming bottle blanks: introducing the raw materials obtained in the step (1) into a charging barrel of an injection molding machine, molding by the injection molding machine, cooling to obtain a tubular bottle blank, transferring the obtained tubular bottle blank to a storage area, and carrying out normal-temperature aging treatment for 48 hours;
step 3, heating the bottle blank: conveying the bottle blanks through the drying oven by using conveying equipment, heating the bottle blanks, and conveying the bottle blanks to a blow molding machine;
step 4, stretching and low-pressure pre-blowing: placing the bottle blank heated to the plasticity temperature in the step 3 into a mold of a blow molding machine, stretching the bottle blank by using a stretching mandrel, and pre-blowing low-pressure gas into the bottle to expand the bottle blank;
step 5, high-pressure blow molding; increasing the air pressure of the blow molding machine to ensure that the bottle blank is completely contacted with the inner wall of the mold;
step 6, cooling and shaping: cooling water circulation in the mold is utilized to take away the heat of the mold, and the temperature of the mold is reduced to room temperature, so that a final bottle body is obtained;
step 7, quality inspection: the bottle random sampling after the shaping carries out quality testing, measures the thickness of bottle, and the rationality of deflection when judging the blowing to carry out compression experiment and detect bottle intensity, carry out the vacuum pressure experiment afterwards. The partial bottles require vacuum packaging during packaging, so vacuum pressure testing is required.
In this embodiment, the drying temperature of the dryer is 150 degrees, and the drying time is 1.5 to 2 hours. Reduce the humidity in the raw materials granule, avoid moisture to influence the quality of the bottle embryo of moulding plastics.
In the embodiment, the content of the recovered fragments is 10%, and the additive is 0.5% -2% of mica sheets, so that the thermal stability of the molded bottle body can be improved; 0.1-0.2% of transparent setting agent, wherein the transparent setting agent is used for increasing the transparency of the bottle body; 0.2 to 0.4 percent of PET toughening agent, wherein the toughening agent is used for improving the toughness and the strength of the bottle body.
In this example, the barrel temperature was 270 to 300 degrees, and the injection molding machine nozzle temperature was 10 to 15 degrees lower than the barrel temperature.
In the embodiment, the oven temperature is 130-150 ℃, and the baking time is 3-5 s. The bottle embryo after aging treatment is preheated and insulated, the stress is reduced, and meanwhile, the plastic condition is provided for stretching.
In the embodiment, the stretching speed of the stretching mandrel in the step 4 is controlled to be 1-1.4m/s until the bottom of the bottle blank contacts with the bottom of the mold, and low-pressure gas of 1-1.2 MPa is pre-blown to expand the bottle blank to 75% of deformation. The bottle body is deformed to a certain degree by low-pressure pre-blowing, so that the problem of bottle body breakage caused by directly using high pressure is reduced.
In the embodiment, the air pressure of the step 5 high-pressure blow molding is 4MPa-6MPa, and the dwell time is 2s-3s.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (6)
1. A PET bottle processing technology is characterized by comprising the following steps:
s1, blending raw materials: mixing polyethylene terephthalate with the recovered fragments, adding an additive, stirring by using a stirrer, and drying the raw materials by using a dryer;
s2, forming of bottle blanks: introducing the raw material obtained in the step S1 into a charging barrel of an injection molding machine, molding and cooling the raw material by the injection molding machine to obtain a tubular bottle blank, and storing the tubular bottle blank for more than 48 hours;
s3, heating bottle blanks: conveying the bottle blanks through an oven by conveying equipment, heating the bottle blanks to a temperature at which the bottle blanks can be stretched and deformed, and conveying the bottle blanks to a blow molding machine;
s4, stretching and low-pressure pre-blowing: placing the bottle blank heated to the plasticity temperature in the step S3 into a mold of a blow molding machine, stretching the bottle blank by using a stretching mandrel, and pre-blowing low-pressure gas into the bottle to expand the bottle blank;
s5, high-pressure blow molding; increasing the air pressure of the blow molding machine to ensure that the bottle blank is completely contacted with the inner wall of the mold;
s6, cooling and shaping: cooling water circulation in the mold is utilized to take away the heat of the mold, and the temperature of the mold is reduced to room temperature, so that a final bottle body is obtained;
s7, quality inspection: and randomly sampling the formed bottle body for quality detection, measuring the thickness of the bottle body, performing a compression experiment to detect the strength of the bottle body, and then performing a vacuum pressure experiment.
2. The PET bottle processing technology according to claim 1, wherein the content of the recovered fragments is 10%, the additives are 0.5% -2% of mica sheets, 0.1% -0.2% of transparent setting agent, and 0.2% -0.4% of PET toughening agent; the drying temperature in the S1 is 140-180 ℃, and the drying time is 3-4 hours.
3. The process of claim 1, wherein the barrel temperature is 280 to 300 degrees, and the injection molding machine nozzle temperature is 10 to 15 degrees lower than the barrel temperature.
4. The PET bottle processing technology according to claim 1, wherein the oven temperature is 130-150 ℃ and the baking time is 3-5 s.
5. The process for processing PET bottles as claimed in claim 1, wherein the stretching speed of the stretching mandrel in S4 is controlled to be 1-1.4m/S until the bottom of the bottle blank contacts the bottom of the mold, and low-pressure gas of 1-1.2 MPa is pre-blown to expand the bottle blank to 75% deformation.
6. The process for processing PET bottle as claimed in claim 1, wherein the pressure of S5 high pressure blow molding is 4MPa-6MPa, and the dwell time is 2S-3S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310008915.6A CN115972549A (en) | 2023-01-04 | 2023-01-04 | PET bottle processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310008915.6A CN115972549A (en) | 2023-01-04 | 2023-01-04 | PET bottle processing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115972549A true CN115972549A (en) | 2023-04-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310008915.6A Pending CN115972549A (en) | 2023-01-04 | 2023-01-04 | PET bottle processing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115972549A (en) |
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2023
- 2023-01-04 CN CN202310008915.6A patent/CN115972549A/en active Pending
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