CN105644094B - A kind of PO heat shrink films - Google Patents

A kind of PO heat shrink films Download PDF

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Publication number
CN105644094B
CN105644094B CN201511025039.XA CN201511025039A CN105644094B CN 105644094 B CN105644094 B CN 105644094B CN 201511025039 A CN201511025039 A CN 201511025039A CN 105644094 B CN105644094 B CN 105644094B
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Prior art keywords
heat shrink
shrink films
density
mlldpe
ldpe
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CN105644094A (en
Inventor
黄镇荣
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DONGGUAN CITY ZHENGXIN PACKING PRODUCTS Co Ltd
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DONGGUAN CITY ZHENGXIN PACKING PRODUCTS Co Ltd
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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
    • 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
    • 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
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The present invention relates to a kind of PO heat shrink films comprising the upper, middle and lower set gradually from top to bottom, the middle level include following weight percentage components：Polypropylene 20~40%, mLLDPE30~60%, LDPE20~40%.The synergistic effect of polypropylene and metallocene PE can further increase the tensile strength and toughness of PO heat shrink films.

Description

A kind of PO heat shrink films
Technical field
The present invention relates to a kind of heat shrink films more particularly to a kind of PO heat shrink films, belong to packing film technical field.
Background technology
PO heat shrink films are widely used in the one integral piece set of the products such as drinks, pop can class, mineral water class, various beverage classes Packaging, the product flexibility is good, and impact resistance, tear resistance are strong, not cracky, be not afraid of tide, shrinking percentage it is big.
Used PO heat shrink films have limitation in terms of intensity and toughness, generally improve intensity using HDPE.But HDPE can be such that the toughness of PO heat shrink films significantly declines, and after beverage packaging, be easily broken in transportational process.Therefore how to carry The tensile strength and toughness of high PO heat shrink films, become urgent problem to be solved.
Invention content
Technical problem to be solved by the invention is to provide the PO heat shrink films that a kind of tensile strength height, toughness are excellent.
PO heat shrink films of the present invention, including the upper, middle and lower that set gradually from top to bottom, the middle level Including following weight percentage components：
Polypropylene 20~40%
MLLDPE 30~60%
LDPE 20~40%.
For example, the weight percent of polypropylene (PP) can be 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38% or 39%；
The weight percent of mLLDPE (metallocene PE) can be 31%, 32%, 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58% or 60%；
The weight percent of LDPE (low density polyethylene (LDPE)) be 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38% or 39%.
Preferably, the middle level includes following weight percentage components：
Polypropylene 30%
MLLDPE 50%
LDPE 20%.
Preferably, the polypropylene is homopolypropylene；
Preferably, the polyacrylic melt index MI is less than 1, and density is 0.890~0.905g/cm3；
Preferably, the melt index MI of the mLLDPE is 0.2 hereinafter, density is 0.940g/cm3More than；
Preferably, the melt index MI of the LDPE is 0.2~0.3, and density is 0.920~0.923g/cm3。
Preferably, the upper layer includes following weight percentage components：
LDPE 15~30%
HDPE 10~35%
MLLDPE 40~80%.
For example, the weight percent of LDPE (low density polyethylene (LDPE)) can be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28% or 29%；
The weight percent of HDPE (high density polyethylene (HDPE)) be 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%；
The weight percent of mLLDPE (metallocene PE) can be 41%, 42%, 45%, 48%, 50%, 53%, 55%, 57%, 60%, 62%, 65%, 66%, 70%, 72%, 75% or 78%.
Preferably, the upper layer includes following weight percentage components：
LDPE 20%
HDPE 20%
MLLDPE 60%.
Preferably, the melt index MI of the LDPE is 0.2~0.3, and density is 0.920~0.923g/cm3；
Preferably, the melt index MI of the HDPE is 0.01 hereinafter, density is 0.955g/cm3More than；
Preferably, the melt index MI of the mLLDPE is 0.5~1, and density is 0.916~0.920g/cm3。
Preferably, the formula of PO heat shrink films of the present invention lower layer can be identical as upper layer, can also be different, works as the two When being formulated identical, PO heat shrink films have performance more preferably tensile strength and toughness simultaneously.
Preferably, lower layer formula is identical as upper layer, specifically, the lower layer includes following weight percentage components：
LDPE 15~30%
HDPE 10~35%
MLLDPE 40~80%.
For example, the weight percent of LDPE (low density polyethylene (LDPE)) can be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28% or 29%；
The weight percent of HDPE (high density polyethylene (HDPE)) be 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%；
The weight percent of mLLDPE (metallocene PE) can be 41%, 42%, 45%, 48%, 50%, 53%, 55%, 57%, 60%, 62%, 65%, 66%, 70%, 72%, 75% or 78%.
Preferably, the lower layer includes following weight percentage components：
LDPE 20%
HDPE 20%
MLLDPE 60%.
Preferably, the melt index MI of the LDPE is 0.2~0.3, and density is 0.920~0.923g/cm3；
Preferably, the melt index MI of the HDPE is 0.01 hereinafter, density is 0.955g/cm3More than；
Preferably, the melt index MI of the mLLDPE is 0.5~1, and density is 0.916~0.920g/cm3。
Preferably, the thickness on the upper layer:The thickness in middle level:Thickness=1 of lower layer:2~5:1, such as 1:2:1、1: 2.2:1、1:2.5:1、1:2.8:1、1:3:1、1:3.5:1、1:3.7:1、1:4:1、1:4.2:1、1:4.5:1、1:4.8:1 or 1: 5:1。
Preferably, the thickness on the upper layer:The thickness in middle level:Thickness=1 of lower layer:3:1.
Above-mentioned Thickness ratio uses skeleton enhancing structure, and intermediate density is high, plays skeleton function, is provided for PO heat shrink films Tensile strength and tensile strength, ectonexine density is low, plays the role of muscle (skin), is provided for PO heat shrink films preferably tough Property, optical property and heat sealability.
Compared with the prior art, the advantages of the present invention are as follows：The core component of the PO heat shrink films of the present invention is all poly- third Alkene (especially homopolypropylene) and metallocene PE；It is high melt index that it is used with lower layer at the middle and upper levels, low density MLLDPE, main function are toughening；Middle level is low using melt index, the high mLLDPE of density, and main function is enhancing.Cause This can ensure that PO is heat-shrinked film strength and toughness simultaneously by using the mLLDPE of different melt index, density.
In addition, by increasing polypropylene in middle level, the synergistic effect with metallocene PE can further increase PO The tensile strength and toughness of heat shrink films, after tested, the tensile strengths of PO heat shrink films of the invention, toughness are respectively than conventional PO heat shrink films improve 50%, 10% or so.
In short, polypropylene (especially homopolypropylene) and metallocene PE significantly improve the entirety of PO heat shrink films Performance；Compared with conventional PO heat shrink films, although its thickness reduces, the weight of its pack content (such as beverage) with often The content for advising PO heat shrink films is identical.For example, the average thickness of conventional PO heat shrink films is 80 μm, it can pack 15kg's Beverage；Although PO heat shrink films thickness of the present invention is only 60 μm, the beverage of identical weight can be equally packed.
Description of the drawings
Fig. 1 is the structural schematic diagram of embodiment 1PO heat shrink films.
Specific implementation mode
Below in conjunction with attached drawing embodiment, present invention is further described in detail.
Comparative example
The PO heat shrink films of the present embodiment are commercial product, specification 560*0.08mm, for packing 600mL*24 branch Beverage.It is heat-shrinked film strength by HDPE to improve PO, does not add polypropylene.
The PO heat shrink films of the present embodiment include the upper, middle and lower, the thickness on upper layer:The thickness in middle level:Lower layer Thickness=1:3:1.The component that the upper and lower include is identical, and the weight percent of each component is：LDPE25%, HDPE25%, MPE50%；The weight percent of middle level each component is：LDPE17%, HDPE33%, MPE50%.
Embodiment 1
The PO heat shrink films of the present embodiment, as shown in Figure 1, including set gradually from top to bottom upper layer 1, middle level 2 and under Layer 3；The thickness on upper layer 1:The thickness in middle level 2:Thickness=1 of lower layer 3:2:1.
Wherein, upper layer 1 is identical with the formula of lower layer 3, all includes following weight percentage components：
LDPE 30%
HDPE 30%
MLLDPE 40%.
Wherein, in the formula of upper layer 1 and lower layer 3, the melt index of LDPE is 0.2~0.3, density is 0.920~ 0.923g/cm3；The melt index of HDPE is 0.01 hereinafter, density is 0.955g/cm3More than；The melt index of mLLDPE is 0.5 ~1, density is 0.916~0.920g/cm3。
Middle level 2 includes following weight percentage components：
Polypropylene 20%
MLLDPE 60%
LDPE 20%.
Wherein, in middle level in 2 formula, polypropylene is homopolypropylene；Polyacrylic melt index is less than 1, and density is 0.890~0.905g/cm3；The melt index of mLLDPE is 0.2 hereinafter, density is 0.940g/cm3More than；The melting of LDPE refers to Number is 0.2~0.3, and density is 0.920~0.923g/cm3。
Embodiment 2
The PO heat shrink films of the present embodiment, including the upper, middle and lower that set gradually from top to bottom；The thickness on upper layer Degree:The thickness in middle level:Thickness=1 of lower layer:3:1.
Wherein, the formula of the upper and lower is identical, all includes following weight percentage components：
LDPE 20%
HDPE 20%
MLLDPE 60%.
Wherein, in the formula of the upper and lower, the melt index of LDPE is 0.2~0.3, density is 0.920~ 0.923g/cm3；The melt index of HDPE is 0.01 hereinafter, density is 0.955g/cm3More than；The melt index of mLLDPE is 0.5 ~1, density is 0.916~0.920g/cm3。
Middle level includes following weight percentage components：
Polypropylene 30%
MLLDPE 50%
LDPE 20%.
Wherein, in formula in middle level, polypropylene is homopolypropylene；Polyacrylic melt index is less than 1, and density is 0.890~0.905g/cm3；The melt index of mLLDPE is 0.2 hereinafter, density is 0.940g/cm3More than；The melting of LDPE refers to Number is 0.2~0.3, and density is 0.920~0.923g/cm3。
Embodiment 3
The PO heat shrink films of the present embodiment, including the upper, middle and lower that set gradually from top to bottom；The thickness on upper layer Degree:The thickness in middle level:Thickness=1 of lower layer:5:1.
Wherein, the formula of the upper and lower is identical, all includes following weight percentage components：
LDPE 15%
HDPE 10%
MLLDPE 75%.
Wherein, in the formula of the upper and lower, the melt index of LDPE is 0.2~0.3, density is 0.920~ 0.923g/cm3；The melt index of HDPE is 0.01 hereinafter, density is 0.955g/cm3More than；The melt index of mLLDPE is 0.5 ~1, density is 0.916~0.920g/cm3。
Middle level includes following weight percentage components：
Polypropylene 40%
MLLDPE 30%
LDPE 30%.
Wherein, in formula in middle level, polypropylene is homopolypropylene；Polyacrylic melt index is less than 1, and density is 0.890~0.905g/cm3；The melt index of mLLDPE is 0.2 hereinafter, density is 0.940g/cm3More than；The melting of LDPE refers to Number is 0.2~0.3, and density is 0.920~0.923g/cm3。
The PO heat shrink films of comparative example, Examples 1 to 3 are tested for the property, test result is shown in Table 1.
The performance of PO heat shrink films prepared by 1. each embodiment of table
The above content is only presently preferred embodiments of the present invention, for those of ordinary skill in the art, according to the present invention Thought, there will be changes in the specific implementation manner and application range, and the content of the present specification should not be construed as to the present invention Limitation.

Claims (12)

1. a kind of PO heat shrink films, including the upper layer (1), middle level (2) and the lower layer (3) that set gradually from top to bottom, feature exists In the middle level (2) includes following weight percentage components：
Polypropylene 20 ~ 40%
mLLDPE 30~60%
LDPE 20~40%；
The upper layer (1) includes following weight percentage components：
LDPE 15~30%
HDPE 10~35%
mLLDPE 40~80%；
The lower layer (3) includes following weight percentage components：
LDPE 15~30%
HDPE 10~35%
mLLDPE 40~80%；
The polyacrylic melt index is less than 1, and density is 0.890 ~ 0.905g/cm3；The melting of mLLDPE in the middle level (2) Index is 0.2 hereinafter, density is 0.940g/cm3More than；
The melt index of mLLDPE is 0.5 ~ 1 in the upper layer (1), and density is 0.916 ~ 0.920g/cm3；
The melt index of mLLDPE is 0.5 ~ 1 in the lower layer (3), and density is 0.916 ~ 0.920g/cm3。
2. PO heat shrink films according to claim 1, which is characterized in that the middle level (2) includes following weight percent Component：
Polypropylene 30%
mLLDPE 50%
LDPE 20%。
3. PO heat shrink films according to claim 1, it is characterised in that：The polypropylene is homopolypropylene.
4. PO heat shrink films according to claim 1, which is characterized in that the melt index of LDPE is in the middle level (2) 0.2 ~ 0.3, density is 0.920 ~ 0.923g/cm3。
5. PO heat shrink films according to claim 1, which is characterized in that the upper layer (1) includes following weight percent Component：
LDPE 20%
HDPE 20%
mLLDPE 60%。
6. PO heat shrink films according to claim 1, which is characterized in that the melt index of LDPE is in the upper layer (1) 0.2 ~ 0.3, density is 0.920 ~ 0.923g/cm3。
7. PO heat shrink films according to claim 1, which is characterized in that the melt index of HDPE is in the upper layer (1) 0.01 hereinafter, density is 0.955g/cm3More than.
8. PO heat shrink films according to claim 1, which is characterized in that the lower layer (3) includes following weight percent Component：
LDPE 20%
HDPE 20%
mLLDPE 60%。
9. PO heat shrink films according to claim 1, it is characterised in that：The melt index of LDPE is in the lower layer (3) 0.2 ~ 0.3, density is 0.920 ~ 0.923g/cm3。
10. PO heat shrink films according to claim 1, the melt index of HDPE is 0.01 hereinafter, close in the lower layer (3) Degree is 0.955g/cm3More than.
11. PO heat shrink films according to claim 1, it is characterised in that：The thickness of the upper layer (1):The thickness in middle level (2) Degree:Thickness=1 of lower layer (3):2~5:1.
12. PO heat shrink films according to claim 1, it is characterised in that：The thickness of the upper layer (1):The thickness in middle level (2) Degree:Thickness=1 of lower layer (3):3:1.
CN201511025039.XA 2015-12-29 2015-12-29 A kind of PO heat shrink films Active CN105644094B (en)

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Publication number Priority date Publication date Assignee Title
CN107458057A (en) * 2017-07-28 2017-12-12 四川兴达塑料有限公司 A kind of grease proofing PE preservative films
CN110641117A (en) * 2019-11-02 2020-01-03 宁波鸿雁包装材料有限公司 High-tensile composite film and preparation method thereof

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JPH1134252A (en) * 1997-07-16 1999-02-09 Sekisui Chem Co Ltd Highly transparent soft film
DE20104189U1 (en) * 2001-03-10 2001-05-31 Foliepack Kunststoffwerk Gmbh Thermoformed film
CN101480861B (en) * 2009-01-23 2011-03-16 石狮市新光塑料包装有限公司 Novel PE film
CN101927591B (en) * 2010-07-08 2013-09-25 福建凯达集团有限公司 Low temperature resistant triple coextrusion composite film
CN104416987B (en) * 2013-08-30 2016-12-28 东莞市正新包装制品有限公司 A kind of polyethylene heat-shrinkage film of low thickness

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