CN203580274U - Environment-friendly degradable heat shrinkage film molded by casting processing - Google Patents
Environment-friendly degradable heat shrinkage film molded by casting processing Download PDFInfo
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- CN203580274U CN203580274U CN201320775235.9U CN201320775235U CN203580274U CN 203580274 U CN203580274 U CN 203580274U CN 201320775235 U CN201320775235 U CN 201320775235U CN 203580274 U CN203580274 U CN 203580274U
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Abstract
The utility model relates to the field of heat shrinkage film processing manufacture, and in particular relates to an environment-friendly degradable heat shrinkage film molded by casting processing. The environment-friendly degradable heat shrinkage film molded by casting processing is of a B/A/B three-layer structure, wherein A is a base material core layer, and B is a printable surface layer; the base material core layer comprises an arbitrary one or more of polyhydroxyalkanoate (PHA), polylactic acid (PLA), poly-beta- hydroxybutyrate (PHB), butylene succinate (PBS) and tetramethylene adipate-polybutylene terephthalate copolymer (PBAT) resin; the printable layer comprises a degradable PLA resin, nano-silicon dioxide and processing agents.
Description
Technical field:
The utility model relates to the processing and manufacturing field of heat shrink films, in particular, relates to a kind of environment-friendly type degradable heat shrink films of curtain coating machine-shaping.
Background technology:
Heat shrink films is widely used in the external packing of the products such as tableware, food, health products, beverage, frame goods, books and periodicals audio-visual product, stationery goods, handicraft, building materials, cosmetics, electronic product, daily chemical products, toy.Heat-shrinkable film has the effect of tight bundle object, covering, moistureproof dustproof, firm, protection product, improving product class.
Along with the fast development of heat shrinkable package, heat shrinkable package product consumption is increasing now.We know that heat-shrinkage material now mainly concentrates on the materials such as PVC, OPS, OPP, SBS, PET, PETG, these materials itself belong to non-renewable petroleum base material, heat shrink films is being used the later stage to exist following defect as packaging film: 1, total output is very large, but the fractional yield flowing in terminal client hand is very little, be unworthy recycling, how to abandon conveniently, cause white pollution; While 2, packing as bottle, during recovery, easily there is separated difficult technical problem, cause consuming a large amount of manpower, material resources and financial resources, increase cost recovery; 3, the current thermal contraction packaging film overwhelming majority is petroleum base material, and oil material is day by day in short supply now, and the price of petroleum base material is also in continuous rising; Even if 4 recuperable products, the complexity that product reclaims and can not realize the accurate classification of material under existing social condition, causes later stage separation difficulty; 5, according to the different demands of product at that time, can add corresponding additive, though cause for salvage material of the same race, its processing characteristics has changed, and again adds fitness of process variation in man-hour, the properties of product variation processing, even if cause the product reclaiming secondary operations also can only make low-end product; 6, the recovery processing repeating only can cause the poor processability of plastic polymer self.In sum, we are badly in need of the environment-friendly type thermal contraction novel film materials that exploitation makes new advances.
Now along with the raising of people's environmental consciousness, degradable environment-friendly type heat shrink films is also developed in succession, because degradable heat shrink films can solve, take the problem of white pollution that heat shrink films is brought and the recovery problem of petroleum base material that petroleum base produces as raw material.And the alternative most of petroleum base heat shrink films of aggravation degradable heat shrink films along with energy scarcity, the at present research of degradation material is in fast development, wherein with Shandong Yi Keman Science and Technology Ltd. and Shan Donghui, is full of the most ripe of new material Science and Technology Ltd. research research.But in degradation material, manufacture degradable heat shrink films process aspect primary stage in development also, only have at present Shenzhen Ecomann Biotechnology Co., Ltd. to make patent report on degradable heat shrink films film-blowing process.But it is blow molding that this patent is reported degradable heat shrink films processing method, blow molding processing itself just exists the shortcomings such as product non-uniform film thickness, low in glossiness, light transmission be poor.Therefore be extremely necessary to develop a kind of high-quality degradable heat shrink films processing technology.
In sum, in prior art, there is following problem:
1, in film-blowing process, for the ease of blow molding, must add plasticizer, and plasticizer can move to along with the accumulation of time degradable membrane surface, plasticizer itself is harmful, cause blowing degradable heat shrink films not pack food material, thereby limited the scope of application of blowfilm shaping degradable membrane.
2, because not adding nano-silicon dioxide modified dose in blowfilm shaping technique, and film-blowing process film thickness deviation is large, causes the film printing performance of blow molding poor, cannot realize the accurate printing to film.
3, there are foreign material bad causing of blow molding filter filter effect in die cavity, causes that logistics is disorderly, and discharging is uneven, affects uneven thickness.
4, blow molding is improper, wayward because of die lip clearance adjusting, causes melt discharging fluctuation, causes uneven thickness.
5, blow molding product is wayward because of cooling effect, causes the blowfilm shaping degradable membrane transparency poor.
6, blown film, because of draw ratio inaccuracy, causes degradable heat shrink films thermal contraction performance unstable.
Each side shortcoming in comprehensive above-mentioned existing degradable heat shrink films film-blowing process, is extremely necessary the environment-friendly type degradable heat shrink films moulding process that exploitation makes new advances.And adopt unidirectional casting and stretching to prepare degradable heat shrink films technique, have no report.
Utility model content:
The purpose of this utility model is to provide a kind of environment-friendly type degradable heat shrink films that utilizes the curtain coating machine-shaping of curtain coating machine-shaping manufacture method acquisition, to solve the problems of the technologies described above.
A kind of environment-friendly type degradable heat shrink films of curtain coating machine-shaping, it is characterized by: this degradable heat shrink films film layer structure is B/A/B three-decker, A is base material sandwich layer, and base material sandwich layer comprises any one in PHA (PHA), PLA (PLA), poly-beta-hydroxy-butyrate (PHB), poly butylene succinate (PBS), tetramethylene adipate-mutual-phenenyl two acid bromide two alcohol ester copolymer (PBAT) resin; B can print top layer, can print top layer and comprise degradable PLA resin, nano silicon and processing aid.
Wherein, in degradable heat shrink films, the shared mass fraction of B layer is 10-15wt%; The shared mass fraction of A layer is 85-90wt% altogether, and A layer and B layer mass percent sum are 100wt%.
Wherein the thickness of degradable heat shrink films is 25 μ m-80 μ m.
For solving the problems of the technologies described above, the manufacture method of the environment-friendly type degradable heat shrink films of curtain coating machine-shaping is:
1, adopt nano-silicon dioxide modified degradation material PLA as the printed skin-material of casting films.The printing performance of film is except outside the Pass having with film self surface tension, also relevant with the surface roughness of film self, by adding nano silicon, change degradable membrane surface roughness, increase ink adhesive force on base material, thereby strengthen the printing performance of film, and nanometer additive can be not harmful as plasticizer.
2, adopt fine filter, preferred filters aperture 20 μ m, such fine filter filtering accuracy is high, can filter out the foreign material in die cavity, guarantees that smelt flow is stable, and discharging is even, and then guarantees the uniformity of film thickness.
3, adopt temperature automatically controlled memory die head, this die head can have been bought in market.Die lip gap is controlled by 36 temperature control bolts, both can manual adjustments die lip gap, can by temperature-controlling system, automatically regulate die lip gap at any time again, guarantee the uniformity that die gap and die temperature distribute, make cooling slab even thickness, to obtain the good film of thickness evenness.
4, the variation by transverse drawing mill width carrys out restrained stretching ratio, multiple gradual by a small margin by transverse drawing mill width increases the Uniform Tension of realizing film, this stretching belongs to mechanical stretching, and its parameter is fixing controlled, therefore can be good at guaranteeing thickness and the percent thermal shrinkage of film.
5, by the thickness of the online Accurate Measurement film of infrared gauge, be convenient to by die head, regulate film thickness at any time.
6, this degradable heat shrink films curtain coating processing technology is to carry out in the large baking oven of transverse stretching equipment, its preheating, stretching, the sealing of sizing environment, substantially be not subject to external environmental interference, can accurately realize the control of each link technological temperature, reach the temperature control deviation in each region within ± 0.5 ℃, thereby can guarantee that film thickness deviation is little, transparency good, percent thermal shrinkage is stable.
The environment-friendly type degradable heat shrink films film layer structure of this curtain coating machine-shaping is B/A/B three-decker, A is base material sandwich layer, and base material sandwich layer comprises any one in PHA (PHA), PLA (PLA), poly-beta-hydroxy-butyrate (PHB), poly butylene succinate (PBS), tetramethylene adipate-mutual-phenenyl two acid bromide two alcohol ester copolymer (PBAT) resin; B can print top layer, can print top layer and comprise degradable PLA resin, nano silicon and processing aid.
In above-mentioned degradable heat shrink films, the shared mass fraction of B layer is 10-15wt%; The shared mass fraction of A layer is 85-90wt% altogether, and A layer and B layer mass percent sum are 100wt%.
The thickness of above-mentioned degradable heat shrink films is 25 μ m-80 μ m.
The concrete preparation process of environment-friendly type degradable heat shrink films of above-mentioned curtain coating machine-shaping is as follows:
Step 1, the material that can print top layer are controlled blanking ratio by measurement charging device, after blender makes the preliminary mixing of material, enter twin-screw vented extruder plastifying fusion, by coarse filter, measuring pump, fine filter and static mixer, enter die head;
Step 2, the material of base material sandwich layer is controlled to blanking ratio by measurement charging device, after blender makes the preliminary mixing of material, enter twin-screw vented extruder plastifying fusion, by coarse filter, measuring pump, fine filter and static mixer, enter die head;
Step 3, high-temperature fusion polymer that step 1 and step 2 are formed, after die head place converges and extrudes, on chilling roller, are cooled to slab by extrudate docile fast;
Step 4, by slab preheating in transverse stretching equipment, through four horizontal Uniform Tensions, sizing, cooling, thickness measurement online, rolling.
The thickness that adopts above-mentioned preparation method's gained degradable heat shrink films is 25 μ m-80 μ m.
In described degradable heat shrink films method for manufacturing, it is characterized by the thickness that adopts the online Accurate Measurement film of infrared gauge, be convenient to by die head, regulate film thickness at any time.
In described degradable heat shrink films method for manufacturing, it is characterized by the preferred temperature automatically controlled memory die head of described die head, die lip gap is controlled by 36 temperature control bolts, and this die head can have been bought on market.
In described degradable heat shrink films method for manufacturing, it is characterized by employing fine filter, preferred filters aperture 20 μ m.
In described degradable heat shrink films method for manufacturing, the processing that it is characterized by this degradable heat shrink films is carried out in the large baking oven closed environment of transverse stretching equipment.
The beneficial effects of the utility model:
The difference of above-mentioned degradable heat shrink films curtain coating processing technology and existing degradable heat shrink films processing technology (blowing):
1, by adopting nanometer adding technique, make the face of gained degradable heat-shrinkable film have certain surface roughness, printing performance is good, and does not need to add plasticizer in curtain coating processing, can be not harmful, be real degradable environment-friendly type green material.
2, preferred high accuracy filter filters out the foreign material in die cavity, guarantees that extrusion pressure is stable, and smelt flow is stable; By adopting the available temperature automatically controlled memory die head arriving in market, guarantee that die lip gap is even; And adjust in time film thickness by online infrared gauge; Three acts synergistically and guarantees that degradable heat-shrinkable film smooth surface is smooth, corrugationless, even without bridging line, very thin film thickness.
3, the variation by transverse drawing mill width carrys out restrained stretching ratio, the increase of multiple gradual by a small margin by transverse drawing mill width realizes film Uniform Tension, this stretching belongs to mechanical stretching, and its parameter is fixing controlled, therefore can be good at guaranteeing thickness and the percent thermal shrinkage of film.
4, degradable heat shrink films is in the large baking oven of transverse stretching equipment, to complete preheating, stretching, setting process, avoid external environment condition to disturb, can accurately realize preheating, stretching, the control of each link technological temperature of shaping, reach the temperature control deviation in each region within ± 0.5 ℃, thereby can guarantee that film gauge variation is little, transparency good, percent thermal shrinkage is stable.
The degradable heat shrink films making has following characteristics:
1, adopt above-mentioned production technology to produce degradable heat shrink films thickness evenness, mechanical performance, glossiness, light transmittance, thermal contraction performance are all good than existing blown film product.
2, B layer can print top layer and comprises nano-silicon dioxide modified PLA, PLA processing characteristics is stable, and owing to having increased the roughness of film surface adding of nano silicon, obtain better face performance, make degradable heat shrink films printing performance good, overcome the technical difficulty that existing degradable heat shrink films cannot print.
3) base material sandwich layer A be any one in PHA (PHA), PLA (PLA), poly-beta-hydroxy-butyrate (PHB), poly butylene succinate (PBS), tetramethylene adipate-mutual-phenenyl two acid bromide two alcohol ester copolymer (PBAT) resin be base material core material, be degradation material, degraded automatically under certain environment after can making film use, environmentally safe, and these materials processing function admirables, good, the well-pressed degree of polymer tack well.
Accompanying drawing explanation:
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is the utility model film layer structure schematic diagram;
Fig. 2 is the schematic flow diagram of the utility model degradable heat-shrinkable film curtain coating manufacturing process embodiment;
Fig. 3 is degradable heat shrink films curtain coating processing process figure.
The specific embodiment:
Case study on implementation given below is to concrete detailed description of the present utility model; at this, point out that following implementation method is to be further explained in detail of the present utility model simultaneously; unintelligible is restriction to the utility model protection domain; if the technical staff familiar in this field only makes the improvement on non-intrinsically safe according to the utility model content, will still belong to protection domain of the present utility model.
Fig. 1 has provided the film layer structure schematic diagram of this curtain coating processing degradable heat-shrinkable film, and described degradable heat-shrinkable film comprises that B can print top layer, and described B layer thickness is identical, A base material sandwich layer.Below in conjunction with flow chart 2, Fig. 3 and film layer structure Fig. 1, be specifically described:
1, B layer: can print top layer.The nano-silicon dioxide modified PLA resin that is 10-15wt% using mass fraction is as printing skin-material, by measurement charging device, control blanking ratio, after making the preliminary mixing of material, blender enters twin-screw vented extruder plastifying fusion, and by entering temperature automatically controlled memory die head after coarse filter, high-precision measuring pump, fine filter, static mixer.
2, A layer: base material sandwich layer.The PHA that is 85-90wt% by gross mass mark (PHA), PLA (PLA), poly-beta-hydroxy-butyrate (PHB), poly butylene succinate (PBS), tetramethylene adipate-mutual-phenenyl two acid bromide two alcohol ester copolymer p BAT) any one in resin be base material core material.By measurement charging device, control blanking ratio, after blender makes the preliminary mixing of material, enter twin-screw vented extruder plastifying fusion, and by entering die head after coarse filter, high-precision measuring pump, fine filter, static mixer.
3, the high-temperature fusion polymer forming in above-mentioned 1 and 2 steps after converging, die head place is extruded, by electrostatic adsorption device high-temperature fusion polymer docile on chilling roller, the quick cooling slab that becomes, afterwards in transverse stretching equipment through preheating, four horizontal Uniform Tensions, sizing;
4, the film after sizing is cooling through normal temperature, carries out thickness measurement online, trimming material (granulation), rolling;
5, film, after Ageing Treatment, divides the finished film that is cut to different fabric widths according to customer demand, the packing of then testing.
In above-mentioned degradable heat shrink films formula, the shared mass fraction of B layer is 10-15wt%; The shared mass fraction of A layer is 85-90wt% altogether, and each resin of A layer mixes with arbitrary proportion.
In above-mentioned degradable heat shrink films formula, A layer and B layer mass percent sum are 100wt%.
The 40 μ m degradable heat-shrinkable films of producing by above-mentioned technique and formula, rete total thickness is 40 μ m, wherein can print the top layer upper and lower film thickness of B layer and be 5 μ m, base material core layer thickness is 30 μ m, and its processing parameter and the film performance index produced are respectively in Table 1 and table 2.
The thin curtain coating fabrication process parameters of table 1 environment-friendly type degradable thermal contraction
Table 2 environment-friendly type degradable heat shrink films performance table
The utility model is not limited to the above-mentioned specific embodiment, can need to adjust the thicknesses of layers of B, A layer according to client, and B layer thickness can be within the scope of 415um, and this degradable heat shrink films gross thickness can be adjusted in the scope of 25～80um.
The heat shrink films of degradable shown in above-described embodiment has following characteristics:
1) adopt above-mentioned production technology to produce degradable heat shrink films thickness evenness, mechanical performance, glossiness, light transmittance, thermal contraction performance are all good than existing blown film product.
2) B layer can print top layer and comprises nano-silicon dioxide modified PLA, PLA processing characteristics is stable, and owing to having increased the roughness of film surface adding of nano silicon, obtain better face performance, make degradable heat shrink films printing performance good, and degradable heat shrink films surface tension, much larger than 38mN/m, reaches the tension force requirement as print film completely as can be seen from Table 2, overcomes the technical difficulty that existing degradable heat shrink films cannot print.
3) base material sandwich layer A be any one in PHA (PHA), PLA (PLA), poly-beta-hydroxy-butyrate (PHB), poly butylene succinate (PBS), tetramethylene adipate-mutual-phenenyl two acid bromide two alcohol ester copolymer (PBAT) resin be base material core material, be degradation material, degraded automatically under certain environment after can making film use, environmentally safe, and these materials processing function admirables, good, the well-pressed degree of polymer tack well.
Claims (3)
1. the environment-friendly type degradable heat shrink films of a curtain coating machine-shaping, it is characterized by: this degradable heat shrink films film layer structure is B/A/B three-decker, A is base material sandwich layer, and base material sandwich layer comprises any one in PHA (PHA), PLA (PLA), poly-beta-hydroxy-butyrate (PHB), poly butylene succinate (PBS), tetramethylene adipate-mutual-phenenyl two acid bromide two alcohol ester copolymer (PBAT) resin; B can print top layer, can print top layer and comprise degradable PLA resin, nano silicon and processing aid.
2. degradable heat shrink films as claimed in claim 1, is characterized by: in degradable heat shrink films, the shared mass fraction of B layer is 10-15wt%; The shared mass fraction of A layer is 85-90wt% altogether, and A layer and B layer mass percent sum are 100wt%.
3. degradable heat shrink films as claimed in claim 1, wherein the thickness of degradable heat shrink films is 25 μ m-80 μ m.
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| CN201320775235.9U CN203580274U (en) | 2013-11-29 | 2013-11-29 | Environment-friendly degradable heat shrinkage film molded by casting processing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103625061A (en) * | 2013-11-29 | 2014-03-12 | 卫辉市银金达薄膜有限公司 | Tape-casting environment-friendly degradable heat-shrink film and manufacturing method thereof |
| CN112046109A (en) * | 2020-09-08 | 2020-12-08 | 山东圣和塑胶发展有限公司 | Degradable bidirectional-shrinkage heat-sealing packaging film and preparation method thereof |
| CN113388239A (en) * | 2020-07-27 | 2021-09-14 | 江苏众志新禹环境科技有限公司 | Efficient degradation type transparent heat-shrinkable film and preparation method thereof |
| CN113843999A (en) * | 2021-09-26 | 2021-12-28 | 中国科学技术大学先进技术研究院 | Preparation method of polybutylene adipate/terephthalate film |
| CN115304892A (en) * | 2022-08-02 | 2022-11-08 | 合肥高贝斯医疗卫生用品有限公司 | Degradable bio-based medical casting film, preparation method and application thereof |
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2013
- 2013-11-29 CN CN201320775235.9U patent/CN203580274U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103625061A (en) * | 2013-11-29 | 2014-03-12 | 卫辉市银金达薄膜有限公司 | Tape-casting environment-friendly degradable heat-shrink film and manufacturing method thereof |
| CN103625061B (en) * | 2013-11-29 | 2016-06-08 | 卫辉市银金达薄膜有限公司 | The environment-friendly type degradable heat-shrinkable film of a kind of curtain coating machine-shaping and manufacture method thereof |
| CN113388239A (en) * | 2020-07-27 | 2021-09-14 | 江苏众志新禹环境科技有限公司 | Efficient degradation type transparent heat-shrinkable film and preparation method thereof |
| CN112046109A (en) * | 2020-09-08 | 2020-12-08 | 山东圣和塑胶发展有限公司 | Degradable bidirectional-shrinkage heat-sealing packaging film and preparation method thereof |
| CN113843999A (en) * | 2021-09-26 | 2021-12-28 | 中国科学技术大学先进技术研究院 | Preparation method of polybutylene adipate/terephthalate film |
| CN113843999B (en) * | 2021-09-26 | 2023-07-04 | 中国科学技术大学先进技术研究院 | Preparation method of poly (adipic acid)/poly (butylene terephthalate) film |
| CN115304892A (en) * | 2022-08-02 | 2022-11-08 | 合肥高贝斯医疗卫生用品有限公司 | Degradable bio-based medical casting film, preparation method and application thereof |
| CN115304892B (en) * | 2022-08-02 | 2023-08-25 | 合肥高贝斯医疗卫生用品有限公司 | Degradable bio-based medical casting film, preparation method and application thereof |
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