CN103640237B - A kind of production technology of heat shrinkable polyester film - Google Patents
A kind of production technology of heat shrinkable polyester film Download PDFInfo
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- CN103640237B CN103640237B CN201310453768.XA CN201310453768A CN103640237B CN 103640237 B CN103640237 B CN 103640237B CN 201310453768 A CN201310453768 A CN 201310453768A CN 103640237 B CN103640237 B CN 103640237B
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Abstract
The invention discloses a kind of production technology of heat shrinkable polyester film, relate to packaging material field, comprise following technique: section, vacuum drying, melt extrude, chilling slab, biaxial tension, cooling and rolling are cut, choose amorphization PETG as raw material, have and be easy to reclaim, nontoxic, tasteless, good mechanical property, meet the feature of environmental protection, by under the environment of vacuum, drying device housing passes to dried material, thus reach the dry object of strengthening, both the softening point of polymer had effectively been improved, avoid it in drying and melt extrude the mutual adhesion of resin particle in process, caking, moisture in resin can be removed again, prevent the polymer containing ester group melt extrude in process occur hydrolytic degradation and produce bubble, heat stepwise, the mode of segment processing, contribute to intermolecular fusion, avoid heating too fast, material is caused to go bad, improve the shrink film intensity produced high, shock-resistant.
Description
Technical field
The invention belongs to packaging material field, more particularly, the present invention relates to a kind of production technology of heat shrinkable polyester film.
Background technology
Heat shrinkable plastic film is usually used in the packaging of instant food, beverage, electronic apparatus, metallic article, general merchandise etc., particularly shrink label is its topmost application, heat shrinkable plastic film is generally obtained mainly with amorphous plastics processing, as polystyrene, polyvinyl chloride, PVDC, application number is the patent of invention of CN03129658.0, there is thermal contraction speed low, low haze, good frictional behaviour, the features such as rolling is smooth, but its raw material contain the elements such as chlorine, be unfavorable for recycling, do not meet environmental requirement; And the shrink film intensity that this production technology is produced is low, not shock-resistant; In addition, at dry and mutual adhesion caking easy when extruding in its production process, and, easily generation hydrolytic degradation and generation bubble.
Summary of the invention
It is high that problem to be solved by this invention is to provide a kind of intensity, the production technology of impact-resistant a kind of heat shrinkable polyester film.
To achieve these goals, the technical scheme that the present invention takes is: a kind of production technology of heat shrinkable polyester film, comprises the steps:
(1) cut into slices: the first step, draw materials, draw materials is amorphization PETG, second step, feedstock transportation, and the 3rd step is pre-crystallized;
(2) vacuum drying: be heated to 70-80 DEG C, the retention time is 6-8h;
(3) melt extrude: heat temperature raising, temperature successively to 170-180 DEG C, 230-240 DEG C, 258-262 DEG C, 268-272 DEG C, 274-276 DEG C, every section of temperature all keeps 10-20 minutes;
(4) chilling slab: the first step, leads melt, second step, shaping, the 3rd step, peels off: the 4th step, measures;
(5) biaxial tension: the first step, longitudinal stretching, second step, cross directional stretch;
(6) heat: be warming up to 160-170 DEG C with the heating rate of 30-40 DEG C/h, and keep 30-40 minutes;
(7) rolling is cut, the first step, traction guiding, second step, cooling, and the 3rd step, flattens, the 4th step, trimming, the 5th step, thickness measuring, the 6th step, sided corona treatment;
Preferably, the equipment that described step (2) uses is vacuum drum drying machine, and the equipment that described step (3) uses is single screw extrusion machine.
Preferably, in described step (3), the screw speed of single screw extrusion machine is adjusted to 62-70r/min.
Preferably, lead melt technique in described step (4) to comprise the steps:
(1) measure;
(2) filter;
(3) curtain coating.
Preferably, in described step (4), moulding process comprises the steps:
(1) Electrostatic Absorption;
(2) cold drum: add distilled water, adjust the temperature to 25-35 DEG C;
Preferably, in described step (5), longitudinal stretching technique comprises the steps:
(1) preheating: use equipment is cast steel roll, and temperature is 60-85 DEG C;
(2) stretch: use equipment is grain roll, and temperature is 80-85 DEG C;
(3) cool: temperature is 30-35 DEG C;
(4) pressure roller: use equipment is forging roller, and temperature is 90-100 DEG C.
Preferably, in described step (5), cross directional stretch technique comprises the steps:
(1) hot air circulation process:
(2) stretch: first adjust temperature and be 90-100 DEG C, keep 20-30 minutes, then adjust temperature and be 105-110 DEG C;
(3) cool: adopt air cooling way, adjustment temperature is 80-90 DEG C;
(4) cushion.
Beneficial effect: adopt technical scheme of the present invention, amorphization PETG is chosen as raw material in step (1), have and be easy to reclaim, nontoxic, tasteless, good mechanical property, meet the features such as environmental protection, step (2) adopts vacuum drum drying machine, by under the environment of vacuum, pass into heat energy, drying agent housing passes to dried material, thus reach the dry object of strengthening, both the softening point of polymer had effectively been improved, avoid it in drying and melt extrude the mutual adhesion of resin particle in process, caking, moisture in resin can be removed again, prevent the polymer containing ester group melt extrude in process occur hydrolytic degradation and produce bubble, heat stepwise is adopted in step (3), the mode of segment processing, contribute to intermolecular fusion, avoid heating too fast, material is caused to go bad, improve the shrink film intensity produced high, shock-resistant.
The equipment that vacuum drying process uses is vacuum drum drying machine, the equipment melt extruding technique use is single screw extrusion machine, screw speed is adjusted to 62-70r/min, material is in vacuum state, vapour pressure declines and the moisture content on material surface is reached capacity state and having evaporated, and discharge recovery in time by vavuum pump, the moisture content of internal batch is constantly to surface penetration, evaporation, discharge, three processes are constantly carried out, material reaches drying purpose within very short time, the melt extruded waters completely pure, improves output.
Step leads melt technique in (4), be divided into three steps, metering, filtration and curtain coating, Leng Gushang is cast to from die lip mouth after the melt flowed out in die head enters hanger-style die by melt metering pump, filter, melt pipe, purifying and processing process are repeated to melt, make it more meet the requirements.
Longitudinal stretching technique and cross directional stretch technique in step (5), distinguish at different temperature and the different types of cooling, thus reach the different-effect of different draw ratios and horizontal and vertical needs.
Detailed description of the invention
Embodiment 1:
This technique divides seven steps to carry out, first carry out (1) section: first carry out drawing materials technique, draw materials is amorphization PETG, carry out feedstock transportation technique again, finally carry out pre-crystallized technique, carry out (2) vacuum drying again: use equipment is vacuum drum drying machine, be heated to 70 DEG C, retention time is 6h, carry out (3) again to melt extrude: the equipment of use is single screw extrusion machine, its screw speed is adjusted to 62r/min, heat temperature raising, temperature successively to 170 DEG C, 230 DEG C, 258 DEG C, 268 DEG C, 274 DEG C, every section of temperature all keeps 10 minutes, then (4) chilling slab is carried out: first carry out leading melt technique, be divided into metering, filter, curtain coating three step, carry out moulding process again: the first step, Electrostatic Absorption, second step, cold drum: add distilled water, adjust the temperature to 25 DEG C, carry out stripping technology again, finally carry out measurement technique, carry out (5) biaxial tension again: first carry out longitudinal stretching technique: the first step, preheating: use equipment is cast steel roll, temperature is 60 DEG C, second step, stretch: use equipment is grain roll, temperature is 80 DEG C, 3rd step, cooling: temperature is 30, 4th step, pressure roller: use equipment is forging roller, temperature is 90 DEG C, carry out cross directional stretch technique again: the first step, hot air circulation process, second step, stretch: first adjusting temperature is 90 DEG C, keep 20 minutes, then to adjust temperature be 105 DEG C, the 3rd step, cooling: adopt air cooling way, adjustment temperature is the 80-90, four step, buffering.Carry out (6) cooling again: be warming up to 160 DEG C with the heating rate of 30 DEG C/h, and keep 30 minutes, finally carry out (7) rolling to cut: first carry out traction guiding technique, carry out process for cooling again, carry out flattening process afterwards, carry out trimming technology again, then carry out thickness measuring technique, finally carry out sided corona treatment technique.
Embodiment 2:
Embodiment 1 is repeated by described same steps, difference is: step (2) vacuum drying: be heated to 75 DEG C, retention time is 7h, step (3) melt extrudes: screw speed is adjusted to 66r/min, temperature successively to 175 DEG C, 235 DEG C, 260 DEG C, 270 DEG C, 275 DEG C, every section of temperature all keeps 15 minutes, step (4) chilling slab: longitudinal stretching: in cold bulging technique, add distilled water, adjust the temperature to 30 DEG C, step (5) biaxial tension: in pre-heating technique, temperature is 72 DEG C, in drawing process, temperature is 83 DEG C, in process for cooling, temperature is 32 DEG C, in pressure roller technique, temperature is 95 DEG C, cross directional stretch: in drawing process, first adjusting temperature is 95 DEG C, keep 25 minutes, adjusting temperature is again 107 DEG C, in process for cooling: adjustment temperature is 85, step 6) cooling: be warming up to 165 DEG C with the heating rate of 35 DEG C/h, and keep 35 minutes.
Embodiment 3:
Embodiment 1 is repeated by described same steps, difference is: step (2) vacuum drying: be heated to 80 DEG C, retention time is 8h, step (3) melt extrudes: screw speed is adjusted to 70r/min, temperature successively to 180 DEG C, 240 DEG C, 262 DEG C, 272 DEG C, 276 DEG C, every section of temperature all keeps 20 minutes, step (4) chilling slab: longitudinal stretching: in cold bulging technique, add distilled water, adjust the temperature to 35 DEG C, step (5) biaxial tension: in pre-heating technique, temperature is 85 DEG C, in drawing process, temperature is 85 DEG C, in process for cooling, temperature is 35, in pressure roller technique, temperature is 100 DEG C, cross directional stretch: in drawing process, first adjusting temperature is 100 DEG C, keep 30 minutes, adjusting temperature is again 110 DEG C, in process for cooling: adjustment temperature is 90, step 6) cooling: be warming up to 170 DEG C with the heating rate of 40 DEG C/h, and keep 40 minutes.
After above PROCESS FOR TREATMENT, take out cloth sample respectively, measurement result is as follows:
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a production technology for heat shrinkable polyester film, is characterized in that, comprises the steps:
(1) cut into slices: the first step, draw materials, draw materials is amorphization PETG, second step, feedstock transportation, and the 3rd step is pre-crystallized;
(2) vacuum drying: be heated to 70-80 DEG C, the retention time is 6-8h;
(3) melt extrude: heat temperature raising, temperature successively to 170-180 DEG C, 230-240 DEG C, 258-262 DEG C, 268-272 DEG C, 274-276 DEG C, every section of temperature all keeps 10-20 minutes;
(4) chilling slab: the first step, leads melt, second step, shaping, the 3rd step, peels off: the 4th step, measures;
(5) biaxial tension: the first step, longitudinal stretching, second step, cross directional stretch;
(6) heat: be warming up to 160-170 DEG C with the heating rate of 30-40 DEG C/h, and keep 30-40 minutes;
(7) rolling is cut, the first step, traction guiding, second step, cooling, and the 3rd step, flattens, the 4th step, trimming, the 5th step, thickness measuring, the 6th step, sided corona treatment.
2. according to the production technology of a kind of heat shrinkable polyester film according to claim 1, it is characterized in that: the equipment that described step (2) uses is vacuum drum drying machine, and the equipment that described step (3) uses is single screw extrusion machine.
3. according to the production technology of a kind of heat shrinkable polyester film according to claim 2, it is characterized in that: in described step (3), the screw speed of single screw extrusion machine is adjusted to 62-70r/min.
4. according to the production technology of a kind of heat shrinkable polyester film according to claim 3, it is characterized in that: lead melt technique in described step (4) and comprise the steps:
(1) measure;
(2) filter;
(3) curtain coating.
5. according to the production technology of a kind of heat shrinkable polyester film according to claim 1, it is characterized in that: in described step (4), moulding process comprises the steps:
(1) Electrostatic Absorption;
(2) cold drum: add distilled water, adjust the temperature to 25-35 DEG C.
6. according to the production technology of a kind of heat shrinkable polyester film according to claim 5, it is characterized in that: in described step (5), longitudinal stretching technique comprises the steps:
(1) preheating: use equipment is cast steel roll, and temperature is 60-85 DEG C;
(2) stretch: use equipment is grain roll, and temperature is 80-85 DEG C;
(3) cool: temperature is 30-35 DEG C;
(4) pressure roller: use equipment is forging roller, and temperature is 90-100 DEG C.
7. according to the production technology of a kind of heat shrinkable polyester film according to claim 5, it is characterized in that: in described step (5), cross directional stretch technique comprises the steps:
(1) hot air circulation process;
(2) stretch: first adjust temperature and be 90-100 DEG C, keep 20-30 minutes, then adjust temperature and be 105-110 DEG C;
(3) cool: adopt air cooling way, adjustment temperature is 80-90 DEG C;
(4) cushion.
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| CN201310453768.XA CN103640237B (en) | 2013-09-29 | 2013-09-29 | A kind of production technology of heat shrinkable polyester film |
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| CN103640237B true CN103640237B (en) | 2016-01-27 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106142788B (en) * | 2015-04-13 | 2018-07-20 | 树业环保科技股份有限公司 | A kind of multi-layer co-extruded heat-shrinkable film and preparation method thereof |
| CN106142782B (en) * | 2015-04-13 | 2018-05-08 | 树业环保科技股份有限公司 | One kind covers iron heat-sealable polyester film and preparation method thereof |
| CN104875404A (en) * | 2015-04-25 | 2015-09-02 | 安徽松泰包装材料有限公司 | PETG membrane production technology |
| CN106142793B (en) * | 2015-04-28 | 2018-11-06 | 树业环保科技股份有限公司 | A kind of hot phase transformation polyester film and preparation method thereof |
| CN106166843A (en) * | 2016-06-28 | 2016-11-30 | 安徽松泰包装材料有限公司 | A kind of preparation method of PRTG heat shrink films |
| CN114454523A (en) * | 2022-03-16 | 2022-05-10 | 江苏邦宇薄膜技术有限公司 | Preparation method of window film |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962734A (en) * | 2006-11-21 | 2007-05-16 | 浙江大学 | Black bi-directional stretching polyester film preparation method |
| CN102875980A (en) * | 2012-09-29 | 2013-01-16 | 四川东方绝缘材料股份有限公司 | Preparation method of heat-resistant oxygen-resistant polyester film |
| CN103102647A (en) * | 2011-11-09 | 2013-05-15 | 中国石油化工股份有限公司 | Preparation method of polyester film with high heat shrinkage |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962734A (en) * | 2006-11-21 | 2007-05-16 | 浙江大学 | Black bi-directional stretching polyester film preparation method |
| CN103102647A (en) * | 2011-11-09 | 2013-05-15 | 中国石油化工股份有限公司 | Preparation method of polyester film with high heat shrinkage |
| CN102875980A (en) * | 2012-09-29 | 2013-01-16 | 四川东方绝缘材料股份有限公司 | Preparation method of heat-resistant oxygen-resistant polyester film |
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