CN211280085U - Printable easily-torn cover film with anti-fouling heat sealing layer - Google Patents
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- CN211280085U CN211280085U CN201921329907.7U CN201921329907U CN211280085U CN 211280085 U CN211280085 U CN 211280085U CN 201921329907 U CN201921329907 U CN 201921329907U CN 211280085 U CN211280085 U CN 211280085U
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Abstract
The utility model relates to a can print and easily take off epiphragma with anti-soil heat-seal layer, the total membrane is thick for 70 ~ 150 mu m, and from the top down is in proper order: the anti-fouling heat-sealing film comprises a corona layer, a first bonding layer, a barrier layer, a second bonding layer, an easy-to-uncover layer and an anti-fouling heat-sealing layer, wherein an easy-to-uncover cover film of the anti-fouling heat-sealing layer is prepared by a multilayer co-extrusion process; the easy-uncovering layer is made of easy-uncovering modified PE, and the thickness of the easy-uncovering layer is 15-25 micrometers; the anti-fouling heat sealing layer is made of viscosity modified PE, and the thickness of the anti-fouling heat sealing layer is 5-10 micrometers; the sum of the thicknesses of the easy-to-tear layer and the anti-fouling heat sealing layer accounts for 20-34% of the total thickness of the easy-to-tear film. The utility model discloses a set up anti-soil heat-seal layer and easily take off the layer on the epiphragma to the anti-soil heat-seal layer of epiphragma is easily taken off in the strict control and the thickness on layer is easily taken off, thereby has realized under the control of low heat-seal technology, makes the epiphragma have anti-soil heat-sealability simultaneously and easily takes off the nature.
Description
Technical Field
The utility model relates to a packaging material field, concretely relates to can print and easily take off epiphragma with anti-soil heat-seal layer.
Background
In the food production process, the processed food is usually packaged in a designated container to achieve the preservation effect. At present, the cooked food industry usually adopts a plastic cover film to realize packaging, but when the processed cooked food is packaged, food oil stains or partial contents are adhered to the sealing surface, so that the heat sealing strength is influenced. The anti-fouling heat seal is also called inclusion heat seal, and refers to the performance of heat seal when partial contents or other pollutants are adhered to the heat seal surface. The contamination-resistant heat-seal property requires not only a strong heat-seal strength of the cover film but also a certain pressure-resistant strength of the packaging bag, and if the plastic packaging film lacks sufficient contamination-resistant heat-seal property, incomplete heat-seal occurs at the time of filling and sealing the contents, which causes leakage or deterioration. However, the easy-peeling function is often achieved by reducing the heat seal strength to make the cover film easily peeled, and the easy-peeling property is usually contrary to the requirement of contamination resistance.
The applicant's chinese patent publication No. CN207916241U discloses an easily peelable high barrier film, in which the inner layer has an easy peeling effect, but the inner layer does not have anti-contamination heat sealing properties. CN104311966A discloses an anti-pollution, low-temperature heat-sealing and easy-to-tear polyethylene film, which is formed by mixing and co-extruding an easy-to-tear material and a low-temperature anti-pollution dye to achieve the anti-pollution and easy-to-tear effect, but the problem that the easy-to-tear strength is too high or the anti-pollution performance is not outstanding is often caused.
In order to facilitate the production and processing of food manufacturers, the printable easy-to-tear-off cover film with the anti-fouling heat sealing layer needs to be provided, the heat sealing of the cover film can be realized only by a lower heat sealing process during heat sealing, and the compression strength of the cover film package is not influenced; when the film is used by a consumer, the covering film is easy to uncover the material to generate cohesive peeling, so that the easy uncovering effect is realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can print and easily take off epiphragma with anti-soil heat-seal layer through set up anti-soil heat-seal layer and easily take off the layer on epiphragma to the anti-soil heat-seal layer that the epiphragma was easily taken off in the close check and the thickness of taking off the layer, thereby realized under the control of low heat-seal technology, made the epiphragma have anti-soil heat-sealability simultaneously and easily take off the nature.
In order to achieve the purpose of the utility model, the utility model provides a can print and easily take off epiphragma with anti-soil heat-seal layer, the total membrane is thick for 70 ~ 150 μm, from the top down is in proper order: the anti-fouling heat-sealing film comprises a corona layer, a first bonding layer, a barrier layer, a second bonding layer, an easy-to-uncover layer and an anti-fouling heat-sealing layer, wherein an easy-to-uncover cover film of the anti-fouling heat-sealing layer is prepared by a multilayer co-extrusion process; wherein the content of the first and second substances,
the easy-uncovering layer is easy-uncovering modified PE;
the anti-fouling heat sealing layer is made of viscosity modified PE, and the thickness of the anti-fouling heat sealing layer is 5-10 micrometers;
the sum of the thicknesses of the easy-to-tear layer and the anti-fouling heat sealing layer accounts for 20-34% of the total thickness of the easy-to-tear film.
Preferably, the corona layer is PA 6.
Preferably, the first adhesive layer and the second adhesive layer are both maleic anhydride modified polyethylene.
Preferably, the easy-uncovering modified PE is random copolymerization PE of a three-well ADMERTM-EP series.
Preferably, the tack-modified PE is POP.
Preferably, the barrier layers comprise a first barrier layer, a second barrier layer and a third barrier layer; the first barrier layer is P A6, the second barrier layer is EVOH, and the third barrier layer is PA 6; wherein the ethylene content in the EVOH is 29-32%.
Preferably, the corona layer is PA.
Further, a surface layer is compounded on the corona layer, and the surface layer is any one of PET or BOPA.
Further, a glue layer is arranged between the surface layer and the corona layer; the glue layer is a two-component polyurethane adhesive, and the two-component polyurethane adhesive is coated on the surface layer to form the glue layer.
The utility model discloses a multilayer co-extrusion technology that can print easily take off lid membrane with anti-soil heat-seal layer, include following step:
s1, melting: respectively adding the raw materials corresponding to each layer into a hopper corresponding to an extruder, melting at a certain temperature, and entering a neck mold;
s2, extruding;
s3, cooling and shaping;
s4, corona treatment;
s5, rolling;
wherein the corona treatment of the step S4 is carried out on the corona layer, and the corona value of the corona layer is 50-60 dynes.
During corona treatment, high-frequency high-voltage electricity is applied to a film corona treatment device to enable the corona treatment device to carry out corona discharge to generate fine and dense blue-violet sparks, various plasmas generated after air ionization accelerate and impact the surface of the film under the action of a strong electric field, the energy of plasma particles is close to the chemical bond energy of the film, the chemical bond of molecules on the surface of the film is induced to break, and the roughness of the surface of the film can be increased.
The utility model relates to a printable easily takes off epiphragma with anti-soil heat-seal layer compares with prior art and has following advantage:
in the printable easy-to-uncover film with the anti-pollution heat sealing layer, when the thickness of the anti-pollution heat sealing layer is 5-10 mu m and the sum of the thicknesses of the easy-to-uncover layer and the anti-pollution heat sealing layer accounts for 20-34% of the total thickness of the easy-to-uncover film, the cover film can complete the heat sealing process at a relatively low heat sealing temperature, and is easy to uncover, and the uncovered surface is uniform white and has good smoothness; the anti-pollution heat sealing strength is good in uniformity and is not greatly changed compared with the conventional heat sealing strength.
Drawings
Fig. 1 is a schematic structural diagram of a printable easy-to-tear film with an anti-soil heat-sealing layer according to the present invention;
reference numerals:
1. a corona layer;
2. a first adhesive layer;
3. a barrier layer; 31. a first barrier layer; 32. a second barrier layer; 33. a third barrier layer;
4. a second adhesive layer;
5. an easy-to-tear layer;
6. an anti-fouling heat-sealing layer;
7. a surface layer;
8. and (6) a glue layer.
Detailed Description
In order to illustrate the invention more clearly, the invention is further described below with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The abbreviations used in the utility model are as follows:
PA: polyamides, commonly known as nylons.
PA 6: polyamide 6 or nylon 6;
BOPA: biaxially stretching a nylon film;
EVOH (3) in the following ratio: ethylene-vinyl alcohol copolymer, wherein the ethylene content is 29-32%;
POP: polyoefin Plastomer, PolyOlefin Plastomer;
PET: polyethylene terephthalate resin;
PE: polyethylene.
The easy-to-tear modified PE used in the utility model is random copolymerization PE of three-well ADMERTM-EP series; the utility model discloses modified PE of stickness used in: the polyethylene, preferably Linear Low Density Polyethylene (LLDPE), has a melting point of 110-130 ℃.
Example 1
The easy-to-tear-off cover film with the anti-fouling heat sealing layer 6 of the embodiment comprises the following components in sequence from top to bottom: 27 mu m corona layer 1, 9 mu m first adhesive layer 2, 30 mu m barrier layer 3, 9 mu m second adhesive layer 4, 19 mu m easy-to-remove layer 5 and 6 mu m anti-fouling heat-sealing layer 6; the total thickness of the easy-to-uncover cover film with the anti-fouling heat-sealing layer 6 is 100 micrometers, and the easy-to-uncover cover film is prepared through a multilayer co-extrusion process.
PA6 is selected as the corona layer 1;
the first adhesive layer 2 is maleic anhydride modified polyethylene;
the barrier layer 3 comprises a first barrier layer 31, a second barrier layer 32 and a third barrier layer 33, wherein the first barrier layer 31 is PA6 and has a thickness of 20 μm; the second barrier layer 32 is made of EVOH with the thickness of 30 mu m; the third barrier layer 33 is P A6, and has a thickness of 20 μm;
the second adhesive layer 4 is adhesive modified PE, and maleic anhydride modified polyethylene is selected;
the composition of each layer of the easy-release cover film with the anti-fouling heat-sealing layer 6 of the present example is shown in table 1, wherein the easy-release layer 5 is made of easy-release modified PE, and random copolymerization PE is usually selected; and the anti-fouling heat-sealing layer 6 is POP.
The multilayer co-extrusion process of the easy-to-open cover film with the anti-fouling heat-sealing layer 6 comprises the following steps:
a first adhesive layer 2, wherein the raw material maleic anhydride modified polyethylene is added into a hopper 2 of an extruder, melted at the temperature of 225 ℃ and enters a neck mold;
a barrier layer 3, raw materials PA6, EVOH and PA6 are sequentially added into a hopper 3, a hopper 4 and a hopper 5 of an extruder, the melting temperature is 220 ℃, 240 ℃ and 220 ℃, and the mixture enters a neck mold;
a second adhesive layer 4, wherein the raw material maleic anhydride modified polyethylene is added into a hopper 6 of an extruder, melted at the temperature of 225 ℃ and enters a neck mold;
easily uncovering the layer 5, adding raw material easily uncovered modified PE into a hopper 7 of an extruder, melting at 190 ℃, and feeding into a neck mold;
the anti-fouling heat-sealing layer 6 is prepared by adding a raw material POP into a hopper 8 of an extruder, melting at 220 ℃ and feeding into a neck mold;
and then extruding, cooling and shaping, and finally rolling the film by a rolling machine as required to obtain the easy-to-open cover film with the anti-fouling heat-sealing layer 6.
The corona layer 1 of the easy-to-uncover cover film with the anti-fouling heat-sealing layer 6 can be subjected to corona treatment before rolling, and printing is carried out on the surface of the corona layer 1 according to customer requirements, wherein the corona value of the corona layer 1 is 50-60 dynes. During corona treatment, high-frequency high-voltage electricity is applied to a film corona treatment device to enable the corona treatment device to carry out corona discharge to generate fine and dense blue-violet sparks, various plasmas generated after air ionization accelerate and impact the surface of the film under the action of a strong electric field, the energy of plasma particles is close to the chemical bond energy of the film, the chemical bond of molecules on the surface of the film is induced to break, and the roughness of the surface of the film can be increased.
Example 2
The structure of the easy-to-open cover film with the anti-fouling heat-sealing layer 6 in the embodiment is the same as that in the embodiment 1, except that:
the total thickness is 120 μm;
the thickness of the corona layer 1 is 38 μm;
the thickness of the first adhesive layer 2 is 11 μm;
the barrier layer 3 is 36 μm thick and comprises a first barrier layer 31, a second barrier layer 32 and a third barrier layer 33, wherein the first barrier layer 31 is PA6 and is 12 μm thick; the second barrier layer 32 is made of EVOH with the thickness of 12 mu m; the third barrier layer 33 is PA6 with the thickness of 12 μm;
the thickness of the second adhesive layer 4 is 11 μm;
the thickness of the easy-uncovering layer 5 is 15 mu m;
the thickness of the anti-fouling heat sealing layer 6 is 9 μm.
The composition of each layer of a release film having an anti-fouling heat-seal layer 6 of this example is shown in table 1.
The multilayer co-extrusion process of the easy-open lidding film with anti-fouling heat-seal layer 6 of this example was the same as in example 1.
This example was the same as example 1.
Example 3
The structure of the easy-to-open cover film with the anti-fouling heat-sealing layer 6 in the embodiment is the same as that in the embodiment 1, except that:
the total thickness is 150 μm;
the thickness of the corona layer 1 is 42 μm;
the thickness of the first adhesive layer 2 is 14 μm;
the barrier layer 3 is 45 μm thick and comprises a first barrier layer 31, a second barrier layer 32 and a third barrier layer 33, wherein the first barrier layer 31 is PA6 and is 15 μm thick; the second barrier layer 32 is made of EVOH, and the thickness is 15 mu m; the third barrier layer 33 is PA6 with the thickness of 15 μm;
the thickness of the second adhesive layer 4 is 14 μm;
the thickness of the easy-uncovering layer 5 is 25 micrometers;
the thickness of the anti-fouling heat sealing layer 6 is 10 microns.
The composition of each layer of a release film having an anti-fouling heat-seal layer 6 of this example is shown in table 1.
The multilayer co-extrusion process of the easy-open lidding film with anti-fouling heat-seal layer 6 of this example was the same as in example 1.
This example was the same as example 1.
Example 4
The structure of the easy-to-open cover film with the anti-fouling heat-sealing layer 6 in the embodiment is the same as that in the embodiment 2, except that:
the total thickness is 70 μm;
the thickness of the corona layer 1 is 16 μm, and PA is selected as the corona layer 1;
the thickness of the first adhesive layer 2 is 5 μm;
the barrier layer 3 is PA6 and has a thickness of 20 μm;
the thickness of the second adhesive layer 4 is 5 μm;
the thickness of the easy-uncovering layer 5 is 16 mu m;
the thickness of the anti-fouling heat sealing layer 6 is 8 mu m.
The composition of each layer of a release film having an anti-fouling heat-seal layer 6 of this example is shown in table 1.
The multilayer co-extrusion process of the easy-to-open cover film with the anti-fouling heat-sealing layer 6 in the embodiment is the same as that in the embodiment 1, and the difference is that:
and the barrier layer 3 is prepared by adding raw material PA6 into a hopper 3 of an extruder, wherein the melting temperature is 220 ℃, and no raw material is added into the hopper 4 and the hopper 5.
In order to improve the stiffness and the barrier property of the easy-to-tear-off cover film with the anti-fouling heat-sealing layer 6 in the embodiment, after the easy-to-tear-off cover film is subjected to corona treatment and printed, a surface layer 7 can be compounded on the surface of the corona layer 1, and the surface layer 7 can be selected from PET, B OPA and the like.
The method for compounding the easy-to-open cover film with the anti-fouling heat sealing layer 6 comprises the following steps: gluing, compounding and curing, wherein the gluing is to coat a two-component polyurethane adhesive on the surface layer 7 to form a glue layer 8.
Comparative example 1:
the easy-to-tear film of this comparative example is the same as example 1 except that: the thickness of the easy-uncovering layer 5 is 25 micrometers, and the thickness of the anti-fouling heat-sealing layer 6 is 7 micrometers.
Comparative example 2:
the antifouling peel-off facilitating film of the present comparative example has the structure disclosed in example 2 of the chinese patent publication No. CN207916241U by the present applicant.
TABLE 1
Test methods and results:
1. and (3) testing the flatness of the uncovering surface: the lidding films obtained in examples 1-4 and comparative examples 1-2 were hermetically sealed at heat-seal temperatures of T1, T2, T3 and T4, respectively, for a heat-seal time of 2 seconds at a pressure of 200KPa, to produce test samples. Tearing the cover film of the test sample, judging the flatness of the uncovering surface by naked eyes, and if the uncovering surface is uniform white, judging the uncovering surface is qualified; if the white color of the peeling surface is intermittent or not obvious, the peeling surface is unqualified. Wherein, T1 is 140 ℃, T2 is 150 ℃, T3 is 160 ℃, and T4 is 170 ℃. The results of the performance tests are detailed in table 2.
2. And (3) easy uncovering strength test: the lidding films obtained in examples 1 to 4 and comparative examples 1 to 2 were sealed and packaged at a heat-sealing temperature of 150 ℃ to prepare test samples, respectively, at a heat-sealing time of 2 seconds and a pressure of 200 KPa. The easy-to-tear strength of the test samples was tested according to ASTM F88, the easy-to-tear strength being the stable strength after opening, and the performance test results are detailed in table 2.
3. Anti-pollution heat seal strength test: taking the easy-to-tear cover film with the anti-fouling heat-sealing layer 6 of the examples 1 to 4 and the easy-to-tear cover film of the comparative examples 1 to 2, dripping a plurality of drops of mineral oil on the anti-fouling heat-sealing layer, standing for 30 seconds, wiping off the mineral oil on the anti-fouling heat-sealing layer, and then respectively carrying out heat sealing on the cover films of the examples 1 to 4 and the comparative examples 1 to 2, wherein the heat sealing conditions are as follows: the heat-sealing temperature was 150 ℃, the heat-sealing time was 2 seconds, and the pressure was 200 KPa. After heat-sealing, the anti-contamination heat-seal strength, which is the strength measured immediately after opening, was tested according to the test method of ASTM F88, and the results of the performance tests are detailed in table 2.
Description of the tests:
in the anti-contamination heat seal strength test, the heat seal layer of comparative example 2 was not anti-contamination, and when the heat seal temperature was adjusted to 170 ℃ after contamination with mineral oil, heat seal could not be achieved, and the lidding film had been seriously deformed due to the excessively high heat seal temperature, so that the anti-contamination heat seal strength data of comparative example 2 could not be obtained.
TABLE 2
As can be seen from the test results in table 2, when POP is used as the anti-fouling heat-sealing layer 6 in the present invention, the anti-fouling heat-sealing strength of the cover film after being contaminated by mineral oil is very little changed compared with the conventional heat-sealing strength; however, after the ordinary cover film is contaminated by mineral oil, heat sealing cannot be realized even if the heat sealing temperature is raised. In the utility model, the easy-to-tear layer 5 adopts random copolymerization PE, and when the thickness is controlled to be more than 15 μm, the anti-pollution heat sealing strength uniformity of the easy-to-tear layer 5 is good; when the thickness of the peeling layer 5 is more than 25 μm, the peeling layer 5 is deformed seriously at the time of heat-sealing, and the uniformity of the anti-contamination heat-seal strength is poor. According to analysis of test results, when the thickness of the anti-fouling heat-sealing layer 6 is 5-10 microns, and the sum of the thicknesses of the easy-to-uncover layer 5 and the anti-fouling heat-sealing layer 6 accounts for 20-34% of the total thickness of the easy-to-uncover film, the film can be subjected to a heat-sealing process at a relatively low heat-sealing temperature, and is easy to uncover, and the uncovered surface is uniform, white and good in smoothness; the anti-pollution heat sealing strength is good in uniformity and is not greatly changed compared with the conventional heat sealing strength.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (9)
1. A printable easy-to-uncover cover film with an anti-fouling heat sealing layer is characterized in that the total film thickness is 70-150 microns, and the total film thickness is as follows from top to bottom: the anti-fouling heat-sealing material comprises a corona layer, a first bonding layer, a barrier layer, a second bonding layer, an easy-to-tear layer and an anti-fouling heat-sealing layer; the easy-to-uncover film of the anti-fouling heat-sealing layer is prepared by a multilayer co-extrusion process; wherein the content of the first and second substances,
the easy-uncovering layer is easy-uncovering modified PE;
the anti-fouling heat sealing layer is made of viscosity modified PE, and the thickness of the anti-fouling heat sealing layer is 5-10 micrometers;
the sum of the thicknesses of the easy-to-tear layer and the anti-fouling heat sealing layer accounts for 20-34% of the total thickness of the easy-to-tear film.
2. The printable easy release film with a soil resistant heat seal layer according to claim 1 wherein the corona layer is PA 6.
3. The printable easy release film with an anti-soil heat seal layer according to claim 1, wherein the first adhesive layer and the second adhesive layer are both maleic anhydride modified polyethylene.
4. The printable easy release film with an anti-soil heat seal layer according to claim 1, wherein the easy release modified PE is random copolymerized PE of the mitsui admetrt-EP series.
5. The printable easy release film with an anti-soil heat seal layer according to claim 1, wherein the tack modified PE is POP.
6. The printable easy release film with an anti-soil heat seal layer according to claim 1, wherein the barrier layer comprises a first barrier layer, a second barrier layer, a third barrier layer; the first barrier layer is PA6, the second barrier layer is EVOH, and the third barrier layer is PA 6.
7. The printable easy release film with an anti-soil heat seal layer according to claim 1, wherein the corona layer is PA.
8. The printable easy-open cover film with the antifouling heat sealing layer is characterized in that a surface layer is compounded on the corona layer, and the surface layer is any one of PET or BOPA.
9. The printable easy-open cover film with anti-fouling heat-sealing layer according to claim 8, characterized in that a glue layer is further arranged between the surface layer and the corona layer; the glue layer is a two-component polyurethane adhesive, and the two-component polyurethane adhesive is coated on the surface layer to form the glue layer.
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| CN201921329907.7U CN211280085U (en) | 2019-08-15 | 2019-08-15 | Printable easily-torn cover film with anti-fouling heat sealing layer |
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| CN201921329907.7U CN211280085U (en) | 2019-08-15 | 2019-08-15 | Printable easily-torn cover film with anti-fouling heat sealing layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356087A (en) * | 2019-08-15 | 2019-10-22 | 江阴升辉包装材料有限公司 | Printable easy-to-uncover cover film with anti-fouling heat sealing layer and process thereof |
| CN112659707A (en) * | 2020-12-17 | 2021-04-16 | 浙江大汇新材料有限公司 | Easy-to-tear food packaging cover film and preparation method thereof |
-
2019
- 2019-08-15 CN CN201921329907.7U patent/CN211280085U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356087A (en) * | 2019-08-15 | 2019-10-22 | 江阴升辉包装材料有限公司 | Printable easy-to-uncover cover film with anti-fouling heat sealing layer and process thereof |
| CN112659707A (en) * | 2020-12-17 | 2021-04-16 | 浙江大汇新材料有限公司 | Easy-to-tear food packaging cover film and preparation method thereof |
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Address after: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee after: Shenghui new materials Co.,Ltd. Address before: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee before: JIANGYIN SUNRISE PACKAGING MATERIAL Co.,Ltd. Address after: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee after: Shenghui New Material Co.,Ltd. Address before: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee before: Shenghui new materials Co.,Ltd. |
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