CN106965511A - A kind of high grade of transparency high-strength hot shrink film - Google Patents
A kind of high grade of transparency high-strength hot shrink film Download PDFInfo
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- CN106965511A CN106965511A CN201610034149.0A CN201610034149A CN106965511A CN 106965511 A CN106965511 A CN 106965511A CN 201610034149 A CN201610034149 A CN 201610034149A CN 106965511 A CN106965511 A CN 106965511A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/418—Refractive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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Abstract
The invention discloses a kind of high grade of transparency high-strength hot shrink film, the heat shrink films are made up of internal layer, outer layer and intermediate layer, by weight percentage, internal layer and outer layer are constituted by the 50% and mLLDPE of the above and 50% and following LLDPE, mLLDPE and LLDPE melt index, which is respectively less than, is equal to 0.5g/10min, and density is all higher than being equal to 0.920g/cm3.Ectonexine is only with mLLDPE and LLDPE, without using auxiliary agent and other polythene materials, and formula is simple, saves raw material；Heat shrink films are caused not only to possess larger tensile strength (being more than 30N) using the mLLDPE and LLDPE that melt index is low, density is big, also have good transparency (mist degree is 8~15%), heat sealing strength (being 30~40N in the present invention, the heat and intensity of existing heat shrink films are about 20~25N) and index of refraction (being more than 90%) concurrently.
Description
Technical field
The present invention relates to a kind of packaging material, and in particular to a kind of high grade of transparency high-strength hot shrink film.
Background technology
Heat shrink films are widely used in the outer packing of food, medicine, sterilizing dinnerware, stationery sports goods, process gift, printed matter, hardware plastic products, telephone set, electronic apparatus etc. various products, especially in terms of combined type (boundling) packaging of anomalistic object article or commodity, heat shrink films can meet commodity it is moistureproof it is dust-proof, touch-proof substitute for another surreptitiously, the function such as transparent display, product appearance attraction can be increased again.This characteristic of heat shrink films makes it to be packed instead of all kinds of cartons to commodity, not only saves packing cost, and meet packaging trend.
The A of Publication No. CN 101049749 Chinese patent application discloses a kind of heat shrinkage film of high transparent multilaminar polyethylene, the heat shrink films are three-decker, wherein internal layer and outer layer are the mixture constituted including mLLDPE (metallocene linear low density polyethylene), LLDPE (linear low density polyethylene (LLDPE)), LDPE (low density polyethylene (LDPE)) and auxiliary agent, and intermediate layer is the mixture that LDPE, LLDPE, HDPE (high density polyethylene (HDPE)) are constituted.Wherein, as mass fraction, in internal layer and outer layer, MLLDPE has 2~4 parts, and LDPE has 3~5 parts, and LLDPE has 2~4 parts, and auxiliary agent has 0.1~0.5 part；In intermediate layer, LDPE has 5~7 parts, and LLDPE has 1~3 part, and HDPE has 1~3 part.
If existing heat shrink films production man is generally acknowledged that used polythene material melt index is lower, density is bigger, the mist degree bigger (transparency is lower) for the heat shrink films being made, intensity are bigger；The transparency and intensity of heat shrink films can not get both.
Simultaneously, due to the current basic preferred consideration thermal contraction film strength of production man, mist degree to heat shrink films and index of refraction require that then relatively low (mist degree is typically more than 30%, index of refraction is below 80%), for the mist degree (transparency for improving heat shrink films) of reduction heat shrink films while heat shrink films intensity is ensured, produce polythene material melt index used in family will it is low but can not too low, density it is big but can not be too big, substantially, melt index about 1g/10min, density about 0.918g/cm3。
The content of the invention
The invention provides a kind of high grade of transparency high-strength hot shrink film, the heat shrink films solve existing thermal contraction film strength and the problem of transparency is difficult to get both.
A kind of high grade of transparency high-strength hot shrink film, it is made up of internal layer, outer layer and intermediate layer, by weight percentage, internal layer and outer layer are constituted by the 50% and mLLDPE of the above and 50% and following LLDPE, the melt index of the mLLDPE and LLDPE, which are respectively less than, is equal to 0.5g/10min, and the density of the mLLDPE and LLDPE are all higher than being equal to 0.920g/cm3。
In the heat shrink films of the present invention, internal layer and outer layer are only with mLLDPE and LLDPE (or all using mLLDPE), and without using auxiliary agent and other polythene materials, formula is simple, saves material.Also, mLLDPE and LLDPE melt index is respectively less than to be all higher than being equal to 0.920g/cm equal to 0.5g/10min, density3Internal layer and outer layer are prepared using the mLLDPE and LLDPE that melt index is low, density is big, so that heat shrink films have not only possessed larger tensile strength (being more than 30N), also have good transparency (mist degree is 8~15%), heat sealing strength (being 30~40N in the present invention, the heat and intensity of existing heat shrink films are about 20~25N) and index of refraction (being more than 90%) concurrently.
If no special instruction is made, in the present invention, mLLDPE and LLDPE melt index lower limit refer to the minimum melt index values of the mLLDPE that can accomplish in this area and LLDPE；MLLDPE and LLDPE upper density limit refers to the maximum density values of the mLLDPE that can accomplish in this area and LLDPE.
Preferably, by weight percentage, internal layer and outer layer by 50%~70% mLLDPE and 30%~50% and LLDPE constitute.Again under the composition, the mist degree of heat shrink films is about 8~12%, and tensile strength is about 30~34N, and index of refraction is about 91~95%.
The invention provides the formula in two kinds of intermediate layers, the formula in one of which intermediate layer is：
By weight percentage, the intermediate layer is made up of 30~50% LDPE, 30~50% HDPE and 10~30% LLDPE, and the melt index of the LDPE is less than 0.3g/10min.
HDPE in intermediate layer is mainly used in assigning heat shrink films certain deflection, and LDPE is then mainly used in assigning heat shrink films certain telescopicing performance, and LLDPE is mainly used in the certain processing characteristics of imparting heat shrink films and is easy to blowfilm shaping.
The present invention is less than 0.3g/10min LDPE using melt index, can further improve the telescopicing performance of heat shrink films, and percent thermal shrinkage improves 1~2%.
Preferably, by weight percentage, the intermediate layer is made up of 35~45% LDPE, 30~40% HDPE and 10~20% LLDPE.
The formula in another intermediate layer is：
By weight percentage, the intermediate layer is made up of 35~50% LDPE, 30~50% HDPE, 10~30% LLDPE and 1~30% mLLDPE, and the melt index of the LDPE is less than 0.3g/10min.
The tensile strength that appropriate mLLDPE is favorably improved heat shrink films is added on the basis of the first Interlayer Formulation, the mLLDPE melt index used are less than 0.5g/10min, density and are more than 0.920g/cm3。
Preferably, by weight percentage, the intermediate layer is made up of 35~45% LDPE, 30~40% HDPE, 10~20% LLDPE and 8~12% mLLDPE.
As further preferred, by weight percentage, the intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
Without using auxiliary agent in the Interlayer Formulation of the present invention.
Based on intensity, transparency and the index of refraction that the high grade of transparency high-strength hot shrink film is excellent, present invention also offers the packaging material being made using the high grade of transparency high-strength hot shrink film.
Compared with prior art, beneficial effects of the present invention are：
(1) in high grade of transparency high-strength hot shrink film of the invention, internal layer and outer layer are only with mLLDPE and LLDPE, and without using auxiliary agent and other polythene materials, formula is simple, saves material；
(2) mLLDPE and LLDPE of the present invention melt index are respectively less than 0.5g/10min, density and are all higher than 0.920g/cm3So that heat shrink films have not only possessed larger tensile strength (being more than 30N), also have good transparency (mist degree is 8~15%), heat sealing strength (being 30~40N in the present invention, the heat and intensity of existing heat shrink films are about 20~25N) and index of refraction (being more than 90%) concurrently；
(3) in high grade of transparency high-strength hot shrink film of the invention, the melt index that intermediate layer is used is less than 0.3g/10min LDPE, so can further improve the telescopicing performance of heat shrink films, and percent thermal shrinkage improves 1~2%.
Embodiment
Embodiment is set forth below to be described in further detail technical scheme.
Embodiment 1
A kind of high grade of transparency high-strength hot shrink film of the present embodiment, is made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 50% mLLDPE with 50% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.5g/10min, and density is 0.920g/cm3；LLDPE melt index is 0.3g/10min, and density is 0.925g/cm3；LDPE melt index is 0.3g/10min, and density is 0.923g/cm3.
The preparation method of the high grade of transparency high-strength hot shrink film is：
(1) internal layer, outer layer and the raw material in intermediate layer are weighed respectively by default percentage by weight；
(2) after each mixing internal layer, outer layer and the raw material in intermediate layer, it is respectively put into plastics processing mill, 15min is heated at 170 DEG C, the hot material plastified；
(3) hot material for having plastified three layers is extruded on three single screw extrusion machines, pipe is extruded into by triple extrusion die head respectively, and co-extrusion die head temperature is 205 DEG C, is molded by blow extrusion, overtemperature is automatically air-cooled, obtains heat shrink films.
Embodiment 2
A kind of high grade of transparency high-strength hot shrink film of the present embodiment, is made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 60% mLLDPE with 40% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.3g/10min, and density is 0.946g/cm3；LLDPE melt index is 0.11g/10min, and density is 0.944g/cm3；LDPE melt index is 0.3g/10min, and density is 0.920g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Embodiment 3
A kind of high grade of transparency high-strength hot shrink film of the present embodiment, is made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 70% mLLDPE with 30% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.2g/10min, and density is 0.950g/cm3；LLDPE melt index is 0.5g/10min, and density is 0.920g/cm3；LDPE melt index is 0.25g/10min, and density is 0.920g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Embodiment 4
A kind of high grade of transparency high-strength hot shrink film of the present embodiment, is made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 80% mLLDPE with 20% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.14g/10min, and density is 0.940g/cm3；LLDPE melt index is 0.14g/10min, and density is 0.941g/cm3；LDPE melt index is 0.25g/10min, and density is 0.923g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Embodiment 5
A kind of high grade of transparency high-strength hot shrink film of the present embodiment, is made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 90% mLLDPE with 10% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.11g/10min, and density is 0.944g/cm3；LLDPE melt index is 0.2g/10min, and density is 0.950g/cm3；LDPE melt index is 0.3g/10min, and density is 0.923g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Embodiment 6
A kind of high grade of transparency high-strength hot shrink film of the present embodiment, is made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 100% mLLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.3g/10min, and density is 0.925g/cm3；LLDPE melt index is 0.5g/10min, and density is 0.920g/cm3；LDPE melt index is 0.25g/10min, and density is 0.920g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Embodiment 7
A kind of high grade of transparency high-strength hot shrink film of the present embodiment, is made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 70% mLLDPE with 30% LLDPE, and intermediate layer is made up of 43% LDPE, 39% HDPE and 18% LLDPE.
In the present embodiment, mLLDPE melt index is 0.2g/10min, and density is 0.950g/cm3；LLDPE melt index is 0.14g/10min, and density is 0.941g/cm3；LDPE melt index is 0.25g/10min, and density is 0.923g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Comparative example 1
A kind of heat shrink films of this comparative example, are made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 40% mLLDPE with 60% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.5g/10min, and density is 0.920g/cm3；LLDPE melt index is 0.5g/10min, and density is 0.920g/cm3；LDPE melt index is 0.25g/10min, and density is 0.923g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Comparative example 2
A kind of heat shrink films of this comparative example, are made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 70% mLLDPE with 30% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.3g/10min, and density is 0.925g/cm3；LLDPE melt index is 0.5g/10min, and density is 0.920g/cm3；LDPE melt index is 0.5g/10min, and density is 0.921g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Comparative example 3
A kind of heat shrink films of this comparative example, are made up of internal layer, outer layer and intermediate layer.Wherein, by weight percentage, internal layer and outer layer are made up of 70% mLLDPE with 30% LLDPE, and intermediate layer is made up of 40% LDPE, 35% HDPE, 15% LLDPE and 10% mLLDPE.
In the present embodiment, mLLDPE melt index is 0.8g/10min, and density is 0.950g/cm3；LLDPE melt index is 1.0g/10min, and density is 0.918g/cm3；LDPE melt index is 0.25g/10min, and density is 0.920g/cm3。
The preparation method be the same as Example 1 of the high grade of transparency high-strength hot shrink film.
Detect example 1
The physical property for the heat shrink films that embodiment 1~7, comparative example 1~2 are obtained is investigated respectively, is investigated result and is seenTable 1。
Table 1The physical property of embodiment 1~7 and each heat shrink films of comparative example 1~3
ByTable 1It can be seen that, when internal layer and outer layer are made up of the 50% and mLLDPE of the above and 50% and following LLDPE, the mist degrees of heat shrink films, index of refraction and tensile strength are preferable, and when mLLDPE ratio declines, tensile strength declines；When the melt index for the LDPE that intermediate layer is used is more than 0.3g/10min, the shrinkage of heat shrink films decreases.
Claims (8)
1. a kind of high grade of transparency high-strength hot shrink film, is made up of internal layer, outer layer and intermediate layer, its
Be characterised by, by weight percentage, internal layer and outer layer by 50% and the above mLLDPE with
50% and following LLDPE is constituted, and the melt index of the mLLDPE and LLDPE are respectively less than
Equal to 0.5g/10min, the density of the mLLDPE and LLDPE are all higher than being equal to 0.920g/cm3。
2. high grade of transparency high-strength hot shrink film as claimed in claim 1, it is characterised in that press
Percentage by weight meter, internal layer and outer layer by 50%~70% mLLDPE and 30%~50% and
LLDPE is constituted.
3. high grade of transparency high-strength hot shrink film as claimed in claim 1 or 2, it is characterised in that
By weight percentage, the intermediate layer by 30~50% LDPE, 30~50% HDPE and
10~30% LLDPE compositions, the melt index of the LDPE is less than 0.3g/10min.
4. high grade of transparency high-strength hot shrink film as claimed in claim 3, it is characterised in that press
Percentage by weight meter, the intermediate layer by 35~45% LDPE, 30~40% HDPE and
10~20% LLDPE compositions.
5. high grade of transparency high-strength hot shrink film as claimed in claim 1 or 2, it is characterised in that
By weight percentage, the intermediate layer by 35~50% LDPE, 30~50% HDPE,
10~30% LLDPE and 1~30% mLLDPE compositions, the melt index of the LDPE is small
In 0.3g/10min.
6. high grade of transparency high-strength hot shrink film as claimed in claim 5, it is characterised in that press
Percentage by weight meter, the intermediate layer is by 35~45% LDPE, 30~40% HDPE, 10~20%
LLDPE and 8~12% mLLDPE composition.
7. high grade of transparency high-strength hot shrink film as claimed in claim 6, it is characterised in that press
Percentage by weight meter, the intermediate layer by 40% LDPE, 35% HDPE, 15% LLDPE
MLLDPE with 10% is constituted.
8. the packaging being made using any high grade of transparency high-strength hot shrink film of claim 1~7
Material.
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| CN201610034149.0A CN106965511A (en) | 2016-01-19 | 2016-01-19 | A kind of high grade of transparency high-strength hot shrink film |
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| CN201610034149.0A CN106965511A (en) | 2016-01-19 | 2016-01-19 | A kind of high grade of transparency high-strength hot shrink film |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109591412A (en) * | 2018-11-29 | 2019-04-09 | 烟台丰福莱薄膜科技有限公司 | A kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure |
| CN110126413A (en) * | 2019-05-30 | 2019-08-16 | 福建富一锦科技有限公司 | 90 degree of fit films of meat PE of one kind and preparation method thereof |
| CN111875860A (en) * | 2020-06-28 | 2020-11-03 | 江阴市德惠热收缩包装材料有限公司 | Low-temperature heat shrinkable film and preparation method thereof |
| CN113895120A (en) * | 2021-09-29 | 2022-01-07 | 华南理工大学 | Shrink film and preparation method thereof |
| CN116728930A (en) * | 2023-06-21 | 2023-09-12 | 青岛泰博聚合标签有限公司 | High-transparency polyethylene heat-shrinkable film and preparation method thereof |
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| CN101049749A (en) * | 2007-04-20 | 2007-10-10 | 上海紫泉标签有限公司 | Heat shrinkage film of high transparent multilaminar polyethylene |
| US20110003099A1 (en) * | 2008-03-07 | 2011-01-06 | Vinck Michael J | Polyethylene and Coextruded Films Made Using Such Polyethylene |
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| CN101049749A (en) * | 2007-04-20 | 2007-10-10 | 上海紫泉标签有限公司 | Heat shrinkage film of high transparent multilaminar polyethylene |
| US20110003099A1 (en) * | 2008-03-07 | 2011-01-06 | Vinck Michael J | Polyethylene and Coextruded Films Made Using Such Polyethylene |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109591412A (en) * | 2018-11-29 | 2019-04-09 | 烟台丰福莱薄膜科技有限公司 | A kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure |
| CN110126413A (en) * | 2019-05-30 | 2019-08-16 | 福建富一锦科技有限公司 | 90 degree of fit films of meat PE of one kind and preparation method thereof |
| CN111875860A (en) * | 2020-06-28 | 2020-11-03 | 江阴市德惠热收缩包装材料有限公司 | Low-temperature heat shrinkable film and preparation method thereof |
| CN113895120A (en) * | 2021-09-29 | 2022-01-07 | 华南理工大学 | Shrink film and preparation method thereof |
| CN116728930A (en) * | 2023-06-21 | 2023-09-12 | 青岛泰博聚合标签有限公司 | High-transparency polyethylene heat-shrinkable film and preparation method thereof |
| CN116728930B (en) * | 2023-06-21 | 2024-03-29 | 青岛泰博聚合标签有限公司 | High-transparency polyethylene heat-shrinkable film and preparation method thereof |
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