CN112659702A - High-humidity-resistance polyethylene film and production method thereof - Google Patents
High-humidity-resistance polyethylene film and production method thereof Download PDFInfo
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- CN112659702A CN112659702A CN202011531203.5A CN202011531203A CN112659702A CN 112659702 A CN112659702 A CN 112659702A CN 202011531203 A CN202011531203 A CN 202011531203A CN 112659702 A CN112659702 A CN 112659702A
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- 239000004698 Polyethylene Substances 0.000 title claims abstract description 43
- -1 polyethylene Polymers 0.000 title claims abstract description 43
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000010410 layer Substances 0.000 claims abstract description 68
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 38
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 38
- 239000011347 resin Substances 0.000 claims abstract description 25
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 18
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 15
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 15
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 12
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 12
- 229920001179 medium density polyethylene Polymers 0.000 claims abstract description 10
- 239000004701 medium-density polyethylene Substances 0.000 claims abstract description 10
- 238000010096 film blowing Methods 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000003851 corona treatment Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000005022 packaging material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 235000019634 flavors Nutrition 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a high-humidity-resistance polyethylene film and a production method thereof, belonging to the technical field of packaging materials, wherein the film is formed by sequentially connecting a corona layer, a middle layer and a heat-sealing layer; the corona layer is composed of low-density polyethylene and linear low-density polyethylene resin in a mass ratio of 7:13, the middle layer is composed of high-density polyethylene and linear low-density polyethylene resin in a mass ratio of 17:3, and the heat sealing layer is composed of metallocene linear medium-density polyethylene, first linear low-density polyethylene and second linear low-density polyethylene resin in a mass ratio of 2:2: 1. The polyethylene film has the water vapor transmission capacity of 0.5 g/square meter 24h, has higher moisture resistance compared with the common polyethylene film, can well protect the packaged contents, ensures the shelf life and quality guarantee period of the product, and meets the requirements of the product.
Description
Technical Field
The invention relates to the field of packaging materials, in particular to a high-humidity-resistance polyethylene film and a production method thereof.
Background
With the continuous improvement of living standard, the requirements of people on the flavor and the taste of food are also continuously improved. The barrier film with high moisture resistance can effectively prevent external water vapor and liquid from permeating, can better prolong the loss of water in packaged contents, can better protect the contents from flavor deterioration and deterioration, and prolongs the circulation period and shelf life of commodities.
The water vapor permeability of the moisture resistance performance of the existing polyethylene film is generally about 3-7 (g/(-) -24 h)), and for some packaged content products sensitive to humidity, the water vapor permeability numerical value cannot meet the requirements of the products, the moisture resistance performance of the content can be continuously reduced due to insufficient moisture resistance performance of the coating in a short time, the taste of the product can be reduced, and the shelf life and the quality guarantee period of the product can be influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high moisture-resistant polyethylene film and a production method thereof.
In order to realize one of the purposes of the invention, the invention provides a high moisture resistance polyethylene film, which adopts the following technical scheme:
the film is formed by sequentially connecting a corona layer, an intermediate layer and a heat sealing layer; the corona layer is composed of low-density polyethylene and linear low-density polyethylene resin in a mass ratio of 7:13, the middle layer is composed of high-density polyethylene and linear low-density polyethylene resin in a mass ratio of 17:3, and the heat sealing layer is composed of metallocene linear medium-density polyethylene, first linear low-density polyethylene and second linear low-density polyethylene resin in a mass ratio of 2:2: 1.
Preferably, the ratio of the thickness of the corona layer, the intermediate layer and the heat-seal layer is 13:45: 12.
Preferably, the total thickness of the film is 70 μm.
Preferably, the grade of the low density polyethylene in the corona layer is 150BW produced by northern Europe chemical industry, and the grade of the linear low density polyethylene in the corona layer is 7042 produced by Zhehai refining company; the high density polyethylene in the middle layer is named as XUS59999.39 manufactured by the Dow company in America, and the linear low density polyethylene in the middle layer is named as 2036P manufactured by the Dow company in America; the metallocene linear medium density polyethylene in the heat seal layer was designated SP1520 manufactured by Exxon, the first linear low density polyethylene in the heat seal layer was designated 2036P manufactured by Dow, USA, and the second linear low density polyethylene in the heat seal layer was designated 2045G manufactured by Dow, USA.
Preferably, the corona layer comprises 35 parts of low density polyethylene and 65 parts of linear low density polyethylene resin; the middle layer comprises 85 parts of high density polyethylene and 15 parts of linear low density polyethylene resin; the heat seal layer comprises 40 parts of metallocene linear medium density polyethylene, 40 parts of low density polyethylene and 20 parts of linear low density polyethylene resin.
The second object of the present invention is to provide a method for producing a polyethylene film with high moisture resistance, which comprises the following steps:
s1, weighing the components in parts by weight according to the formula composition of a corona layer, a middle layer and a heat sealing layer in the film, and respectively adding the components into three charging barrels of WH film blowing equipment;
s2, mixing and melting the film blowing resin particles in the three charging barrels in the step S1 to form a tube blank, stretching the tube blank, then punching the tube blank from the center of an extruder die head and compressing air to blow the tube blank into film bubbles, and simultaneously cooling and shaping the film bubbles through an air ring to obtain a polyethylene film;
s3, carrying out corona treatment on the polyethylene film in the step S2 to obtain the high-moisture-resistance polyethylene film.
Preferably, the extrusion temperature of the layer A of the extruder in the step S2 is 175 ℃/180 ℃/180 ℃/180 ℃; the extrusion temperature of the B layer of the extruder in the step S2 is 175 ℃/180 ℃/180 ℃/180 ℃; the extrusion temperature of the C layer of the extruder in the step S2 is 170 ℃/175 ℃/175 ℃/175 ℃/175 ℃/175 ℃.
Preferably, the die temperatures of zones 1 to 10 of the extruder in step S2 are all 180 ℃.
Preferably, the winding tension in step S2 is 80N.
Compared with the prior art, the invention has the beneficial effects that:
1) the polyethylene film has the water vapor transmission capacity of 0.5 g/square meter (24 h), has higher humidity resistance compared with the common polyethylene film (the water vapor transmission capacity is 3.4 g/square meter (24 h)), can play a good protection role on the packaged contents, ensures the shelf life and the quality guarantee period of the product, and meets the requirements of the product.
2) According to the polyethylene film, the particles and the thickness of each layer of the formula are optimally selected, namely, the corona layer uses low-density polyethylene (the mark is 150BW produced by northern Europe chemical industry company), so that the film has excellent glossiness; the corona layer uses linear low density polyethylene (7042 made by Zhenhai refining company), so that the film has better composite property and mechanical property; the middle layer is made of high-density polyethylene (XUS 59999.39 manufactured by Dow company in America), has good moisture resistance, has higher HDPE content, increases the thickness of the middle layer, and further improves the moisture resistance of the film; the linear low-density polyethylene (the trademark is 2036P produced by Dow company in America) selected for the heat sealing layer has good crystallinity, and the barrier property of the film can be further improved while the stiffness of the film is ensured; meanwhile, the polyethylene film has good glossiness, good physical and mechanical properties and uniform thickness, so that the film has excellent processing performance and can meet the packaging requirements of customers.
Drawings
FIG. 1 is a schematic structural diagram of a polyethylene film according to the present invention.
The meanings of the symbols in the drawings are as follows:
1-corona layer, 2-middle layer and 3-heat sealing layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
Example 1
S1, weighing the components in parts by weight according to the formula composition of a corona layer, a middle layer and a heat sealing layer in the film, wherein the corona layer comprises 35 parts of low-density polyethylene and 65 parts of linear low-density polyethylene resin, the middle layer comprises 85 parts of high-density polyethylene and 15 parts of linear low-density polyethylene resin, and the heat sealing layer comprises 40 parts of metallocene linear medium-density polyethylene, 40 parts of low-density polyethylene and 20 parts of linear low-density polyethylene resin, and then respectively adding the components into three charging barrels of a WH film blowing device.
S2, mixing and melting the film blowing resin particles in the three charging barrels in the S1 to form a tube blank, stretching the tube blank, then punching compressed air from the center of an extruder die head to blow the tube blank into film bubbles, and simultaneously cooling and shaping the film bubbles through an air ring to obtain a polyethylene film;
and S3, obtaining the high-moisture-resistance polyethylene film through corona treatment.
Wherein the grade of the low density polyethylene in the corona layer 1 in the step S1 is 150BW produced by northern Europe chemical industry company, and the grade of the linear low density polyethylene in the corona layer 1 is 7042 produced by Zhenhai refining company; the high density polyethylene in the middle layer 2 is named as XUS59999.39 manufactured by Dow company, and the linear low density polyethylene in the middle layer 2 is named as 2036P manufactured by Dow company; the metallocene linear medium density polyethylene in the heat seal layer 3 is SP1520 manufactured by Exxon, the first linear low density polyethylene in the heat seal layer 3 is 2036P manufactured by Dow, USA, and the second linear low density polyethylene in the heat seal layer 3 is 2045G manufactured by Dow.
The procedure parameters for example 1 are shown in table 1 below:
TABLE 1
Comparative example 1
S1, weighing the components in parts by weight according to the formula composition of the corona layer, the middle layer and the heat sealing layer in the film, wherein the corona layer comprises 25 parts of low density polyethylene (2420H brand produced by Shanghai petrochemical company) and 75 parts of linear low density polyethylene resin (7042 brand produced by Zhenhai refining company), the middle layer comprises 85 parts of high density polyethylene (HD 3355F brand produced by Thailand petrochemical company) and 15 parts of low density polyethylene resin (2420H brand produced by Shanghai petrochemical company), the heat-sealing layer comprises 33 parts of metallocene linear medium density polyethylene (SP 1520 brand produced by Exxon company), 33 parts of linear low density polyethylene (7042 brand produced by Zhenhai refining company) and 33 parts of linear low density polyethylene resin (2426 brand produced by Yangbai petrochemical company), and the two parts are respectively added into three material cylinders of the film blowing equipment;
s2, mixing and melting the film blowing resin particles in the three charging barrels in the S1 to form a tube blank, stretching the tube blank, then punching compressed air from the center of an extruder die head to blow the tube blank into film bubbles, and simultaneously cooling and shaping the film bubbles through an air ring to obtain a polyethylene film;
and S3, obtaining the common polyethylene film through corona treatment.
Wherein, the thickness of corona layer is 15um, and the thickness of intermediate level is 40um, and the thickness on heat-seal layer is 15 um.
The polyethylene films obtained in example 1 and comparative example 1 were subjected to the performance test, and the test results are shown in the following table 2:
TABLE 2
From the above table 2, it can be seen that the polyethylene film obtained in example 1 has a water vapor transmission rate of 0.5 g/square meter (24 h), and the polyethylene film obtained in comparative example 1 has a water vapor transmission rate of 3.4 g/square meter (24 h), i.e., the polyethylene film obtained in example 1 has a water vapor transmission rate much greater than that of the polyethylene film obtained in comparative example 1, and therefore the polyethylene film of the present invention has a better moisture barrier property. And the glossiness (726%) of the polyethylene film prepared in example 1 is higher than that (702%) of the polyethylene film prepared in comparative example 1, i.e. the glossiness of the polyethylene film of the invention is higher and the performance is better.
Claims (9)
1. The high-humidity-resistance polyethylene film is characterized by being formed by sequentially connecting a corona layer (1), an intermediate layer (2) and a heat sealing layer (3); the corona layer (1) is composed of low-density polyethylene and linear low-density polyethylene resin in a mass ratio of 7:13, the middle layer (2) is composed of high-density polyethylene and linear low-density polyethylene resin in a mass ratio of 17:3, and the heat sealing layer (3) is composed of metallocene linear medium-density polyethylene, first linear low-density polyethylene and second linear low-density polyethylene resin in a mass ratio of 2:2: 1.
2. The high moisture barrier polyethylene film according to claim 1, wherein the thickness ratio of the corona layer (1), the intermediate layer (2) and the heat seal layer (3) is 13:45: 12.
3. The high moisture barrier polyethylene film according to claim 2, wherein the total thickness of the film is 70 μm.
4. The high moisture barrier polyethylene film according to claim 1, wherein the grade of the low density polyethylene in the corona layer (1) is 150BW produced by Nordic chemical company, and the grade of the linear low density polyethylene in the corona layer (1) is 7042 produced by Zhenhai chemical company; the high-density polyethylene in the middle layer (2) is made of XUS59999.39 produced by Dow company in America, and the linear low-density polyethylene in the middle layer (2) is made of 2036P produced by Dow company in America; the metallocene linear medium density polyethylene in the heat sealing layer (3) is SP1520 produced by Exxon company, the first linear low density polyethylene in the heat sealing layer (3) is 2036P produced by Dow company in America, and the second linear low density polyethylene in the heat sealing layer (3) is 2045G produced by Dow company in America.
5. The high moisture barrier polyethylene film according to claim 1, wherein the corona layer (1) comprises 35 parts of low density polyethylene and 65 parts of linear low density polyethylene resin; the intermediate layer (2) comprises 85 parts of high density polyethylene and 15 parts of linear low density polyethylene resin; the heat sealing layer (3) comprises 40 parts of metallocene linear medium density polyethylene, 40 parts of low density polyethylene and 20 parts of linear low density polyethylene resin.
6. The method for producing a polyethylene film with high moisture resistance according to any one of claims 1 to 5, wherein the method comprises the steps of:
s1, weighing components in parts by weight according to the formula composition of a corona layer (1), a middle layer (2) and a heat sealing layer (3) in the film, and respectively adding the components into three charging barrels of WH film blowing equipment;
s2, mixing and melting the film blowing resin particles in the three charging barrels in the step S1 to form a tube blank, stretching the tube blank, then punching the tube blank from the center of an extruder die head and compressing air to blow the tube blank into film bubbles, and simultaneously cooling and shaping the film bubbles through an air ring to obtain a polyethylene film;
s3, carrying out corona treatment on the polyethylene film in the step S2 to obtain the high-moisture-resistance polyethylene film.
7. The method for producing a polyethylene film with high moisture resistance according to claim 6, wherein the extrusion temperature of the layer A of the extruder in the step S2 is 175 ℃/180 ℃/180 ℃/180 ℃; the extrusion temperature of the B layer of the extruder in the step S2 is 175 ℃/180 ℃/180 ℃/180 ℃; the extrusion temperature of the layer C of the extruder in the step S2 is 170 ℃/175 ℃/175 ℃/175 ℃/175 ℃/175 ℃.
8. The method for producing a polyethylene film with high moisture resistance according to claim 6, wherein the die temperatures of the extruder in the zones 1 to 10 in the step S2 are all 180 ℃.
9. The method for producing a polyethylene film with high moisture resistance according to claim 6, wherein the winding tension in step S2 is 80N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011531203.5A CN112659702A (en) | 2020-12-22 | 2020-12-22 | High-humidity-resistance polyethylene film and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011531203.5A CN112659702A (en) | 2020-12-22 | 2020-12-22 | High-humidity-resistance polyethylene film and production method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173149A (en) * | 2011-01-07 | 2011-09-07 | 广州永新包装有限公司 | Antibacterial composite film used for vacuum packing of household articles and preparation method thereof |
| CN104924712A (en) * | 2015-07-16 | 2015-09-23 | 黄山永新股份有限公司 | Self-supporting bag and composite film thereof |
| CN105922690A (en) * | 2016-05-05 | 2016-09-07 | 永新股份（黄山）包装有限公司 | Permeation resisting composite film |
| CN109397809A (en) * | 2018-10-29 | 2019-03-01 | 昆山金盟塑料薄膜有限公司 | A kind of degradable composite membrane and preparation method thereof |
| CN110065270A (en) * | 2019-05-08 | 2019-07-30 | 黄山永新股份有限公司 | A kind of high leakproofness multichannel packaging composite film and its production technology |
| CN110605892A (en) * | 2019-09-27 | 2019-12-24 | 黄山永新股份有限公司 | Large-gram-weight liquid self-supporting bag packaging material and preparation method thereof |
-
2020
- 2020-12-22 CN CN202011531203.5A patent/CN112659702A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173149A (en) * | 2011-01-07 | 2011-09-07 | 广州永新包装有限公司 | Antibacterial composite film used for vacuum packing of household articles and preparation method thereof |
| CN104924712A (en) * | 2015-07-16 | 2015-09-23 | 黄山永新股份有限公司 | Self-supporting bag and composite film thereof |
| CN105922690A (en) * | 2016-05-05 | 2016-09-07 | 永新股份（黄山）包装有限公司 | Permeation resisting composite film |
| CN109397809A (en) * | 2018-10-29 | 2019-03-01 | 昆山金盟塑料薄膜有限公司 | A kind of degradable composite membrane and preparation method thereof |
| CN110065270A (en) * | 2019-05-08 | 2019-07-30 | 黄山永新股份有限公司 | A kind of high leakproofness multichannel packaging composite film and its production technology |
| CN110605892A (en) * | 2019-09-27 | 2019-12-24 | 黄山永新股份有限公司 | Large-gram-weight liquid self-supporting bag packaging material and preparation method thereof |
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Application publication date: 20210416 |