CN113119564A - Puffed food packaging film, preparation method thereof and online electronic crosslinking treatment - Google Patents

Puffed food packaging film, preparation method thereof and online electronic crosslinking treatment Download PDF

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Publication number
CN113119564A
CN113119564A CN201911388511.4A CN201911388511A CN113119564A CN 113119564 A CN113119564 A CN 113119564A CN 201911388511 A CN201911388511 A CN 201911388511A CN 113119564 A CN113119564 A CN 113119564A
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layer
packaging film
food packaging
puffed food
cross
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钱吉鸣
杨伟
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Jiangyin Sunrise Packaging Material Co ltd
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Jiangyin Sunrise Packaging Material 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
    • B32B27/32—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
    • B32B27/06—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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention relates to a puffed food packaging film, a preparation method and an online electronic crosslinking method thereof, wherein the puffed food packaging film comprises an anti-pollution heat sealing layer, a nylon layer, a barrier layer and a printing layer from inside to outside, and the layers are directly bonded through an adhesive; the puffed food packaging film is compounded by a conventional process and then is drawn to an online cross-linking device, a scanning type electron accelerator on the online cross-linking device is opened to emit electron beams, the irradiation dose of the electron beams is 200-2000Kev, the electron cross-linking beam current is 3-15ma, the electron cross-linking power is 80-150KW, the electron processing speed is 10-40m/min, and the processing dose is 15 Mrad; connecting the cooling medium in the cavities of the cooling guide rollers for continuous cooling; walk the puffed food packaging film of pending on online cross-linking device from last to walking down, control one by one the cooling deflector roll conveys, is in simultaneously carry out many times cross-linking under the effect of the electron beam of scanning formula electron accelerator transmission, carries out the edge planing rolling to the puffed food packaging film after the cross-linking is accomplished.

Description

Puffed food packaging film, preparation method thereof and online electronic crosslinking treatment
Technical Field
The invention relates to the technical field of thin-layer products composed of synthetic resin, in particular to a puffed food packaging film, a preparation method thereof and online electronic crosslinking treatment.
Background
The puffed food adopts crops such as potatoes, cereals and the like as main raw materials, mainly adopts puffing processes such as baking, frying and the like to produce products with loose or crisp tissues, such as potato chips, shrimp strips, popcorn and the like, and is popular snack food due to crisp mouthfeel, variable taste and the like; in general, puffed food is a porous food with a net structure, which is produced by rapidly vaporizing water in agricultural product materials under the action of high temperature and high pressure to expand the volume and thus to deform the structure of high molecular substances therein, so that protein is denatured and starch and the like are gelatinized.
The rapid vaporization of the moisture brings crisp and loose mouthfeel to the puffed food, but also brings other problems such as frangibility, deliquescence and the like, and provides new requirements for packaging means of the puffed food; in view of cost, the expanded food is mostly packaged in a flexible inflatable plastic package, and after the expanded food is filled into a flexible plastic package container, the expanded food is vacuumized or not vacuumized, and then protective gas such as nitrogen or carbon dioxide is filled into the expanded food, and then the expanded food is packaged and sealed.
The existing packaging film for puffed food has the structure as the Chinese patent application: a composite film for inflatable package of puffed food in highland environment is composed of a print layer, a barrier layer and a heat-sealing layer, the print layer is a biaxially oriented polyethylene film (BOPE film), the barrier layer is an aluminized polyester film (VMPET) or aluminized polypropylene film (VMBOPP), the heat-sealing layer is a modified polyethylene with interlayer function design, and the layers are made of polyether modified solvent-free adhesive. The composite membrane prepared by the method has the characteristics of a flexible/rigid/flexible laminated structure, is flexible in material, and can meet the requirements of pressure transformation and pressure resistance of over 80 KPa; however, the inflation packaging composite film with the structure is difficult to avoid extrusion, collision and kneading in the processes of loading, unloading, transportation and storage, the barrier layer with the aluminum-containing structure in the three-layer structure is easy to have creases, pinholes and the like, the strength of a heat sealing layer is not ideal, and a seal opening or a seal edge is easy to crack, so that the packaging film is damaged, protective gas leaks, and puffed food is moistened or crushed; and after the packaging film is thickened or the layered structure is adjusted, the usability of the package is easily influenced, the package is not easy to tear, and the user experience is not good.
Therefore, there is a need to improve the existing packaging film for puffed food and the preparation method thereof to meet the market demand.
Disclosure of Invention
A first object of the present invention is to provide a packaging film for puffed food.
The second purpose of the invention is to provide a preparation method of the puffed food packaging film.
The third purpose of the invention is to provide an online electronic crosslinking treatment method for the puffed food packaging film.
In order to achieve the purpose of the invention, the technical scheme of the invention is as follows:
the first aspect of the invention provides a puffed food packaging film which comprises an anti-pollution heat sealing layer, a nylon layer, a blocking layer and a printing layer from inside to outside, wherein the layers are directly bonded through an adhesive, and the using amount of the adhesive is 3.8-4.2 g/m2；
Wherein:
the anti-pollution heat sealing layer is an RCPP film, and the thickness of the anti-pollution heat sealing layer is 60-90 mu m;
the barrier layer is a VMCPP aluminum-plated film, and the thickness of the barrier layer is 10-20 mu m;
the nylon layer is a BOPA film, and the thickness of the nylon layer is 15 micrometers;
the printing layer is a BOPET film with the thickness of 12 mu m.
Furthermore, the adhesive is high-temperature cooking adhesive.
Further, the thickness of the anti-pollution heat sealing layer is 70 μm.
Further, the thickness of the barrier layer is 12 μm.
Furthermore, the RCPP film adopts a cooking grade above 121 ℃.
The BOPET mentioned in the invention is a biaxially oriented polyester film produced by Xiamen Long-Plastic industry Co Ltd; the VMCPP aluminizer is a YG201 type CPP aluminizer produced by Shanghai Yingguan aluminizing technology Limited; BOPA is a synchronous stretching nylon membrane produced by Japan Yougikuko; RCPP selects steaming RCPP with the temperature of over 121 ℃ produced by Hebei Tadao packaging material limited company; the adhesive is SX-100 type high-temperature cooking adhesive produced by Jinan Shaoxing chemical Co.
The second aspect of the present invention provides a method for preparing the packaging film for puffed food, which comprises the following steps:
s1) corona: carrying out corona treatment on the composite surface of the BOPET film;
s2) printing: printing ink on the composite surface of the BOPET film subjected to corona treatment by using printing equipment to form a printing layer, and drying;
s3) sizing: coating a layer of adhesive on one side of the nylon layer, the barrier layer, the anti-fouling heat-sealing layer and the printing layer in the step S2), wherein the adhesive on the printing layer is coated on one side of the printing ink layer;
s4) compounding: and (4) drawing the glued layers in the step S3) to a compounding machine, sequentially placing the glued layers according to the sequence of the printing layer, the barrier layer, the nylon layer and the anti-fouling heat sealing layer, wherein one surface of the adhesive is placed between every two layers, and compounding the layers through the compounding machine to obtain the puffed food packaging film.
Further, the corona value of the corona treatment of the clad surface in the step S1) is 45-55 dyne.
The third aspect of the present invention provides an online electronic crosslinking treatment method for the puffed food packaging film, comprising the following steps: drawing the puffed food packaging film obtained by compounding in the step S4) onto an online cross-linking device, wherein the online cross-linking device comprises a scanning electron accelerator and a transmission device, the transmission device consists of a plurality of cooling guide rollers, and the plurality of cooling guide rollers are distributed into two rows and are respectively positioned at two sides of an electron beam emission path of the scanning electron accelerator; the cooling guide rollers are of a through structure, and a cooling medium is filled in the cavities; opening the scanning electron accelerator, emitting electron beams, wherein the irradiation dose of the electron beams is 200-2000Kev, the electron cross-linking beam current is 3-15ma, the electron cross-linking power is 80-150KW, the electron processing speed is 10-40m/min, and the processing dose is 15 Mrad; connecting the cooling medium in the cavities of the cooling guide rollers for continuous cooling; walk the puffed food packaging film of pending on online cross-linking device from last to walking down, control one by one the cooling deflector roll conveys, is in simultaneously carry out many times cross-linking under the effect of the electron beam of scanning formula electron accelerator transmission, carries out the edge planing rolling to the puffed food packaging film after the cross-linking is accomplished.
Further, the cooling temperature of the cooling guide roller is 12 ℃.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1) according to the packaging film for the puffed food, the nylon layer is thickened between the printing layer and the blocking layer, so that the sealing property and the blocking property of the packaging film for the puffed food are improved, and the leakage of filling gas in the packaging film for the puffed food is reduced;
2) the online electronic crosslinking treatment method for the puffed food packaging film provided by the invention can ensure that the puffed food packaging film keeps higher heat sealing strength before and after treatment, so that the uniformity of the heat sealing strength of the puffed food packaging film is improved, and the defect that the heat sealing strength is obviously reduced is avoided;
3) the invention adopts the cooling guide roller to cool the packaging film of the puffed food, improves the problem of heating and stickiness of the film material after electronic cross-linking treatment, and can rapidly cool the film material to ensure the opening performance.
Drawings
FIG. 1 is a schematic view of an electronic crosslinking treatment of the packaging film of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Abbreviations used in the present invention are as follows:
RCPP: cooking cast polypropylene
VMCPP: aluminium plated cast polypropylene
BOPA: biaxially oriented nylon
BOPET: biaxially oriented polyester
Example 1
The puffed food packaging film with the thickness of 107 microns is prepared by a multilayer co-extrusion process and sequentially comprises an anti-pollution heat sealing layer, a nylon layer, a blocking layer and a printing layer from inside to outside, the layers are directly bonded through an adhesive, and the using amount of the adhesive is 3.8g/m2；
Wherein:
the anti-pollution heat sealing layer is an RCPP film, the thickness of the anti-pollution heat sealing layer is 60 mu m, and steaming grade RCPP with the temperature of more than 121 ℃ produced by Hebei Tada packaging material company Limited is selected;
the barrier layer is a VMCPP aluminum-plated film with the thickness of 20 mu m, and a YG201 type CPP aluminum-plated film produced by Shanghai Yingguan film-plating technology Limited company is selected;
the nylon layer is a BOPA film with the thickness of 15 mu m, and a synchronous stretching nylon film produced by Japan Yougiki Co., Ltd is selected;
the printing layer is a BOPET film, the thickness of the printing layer is 12 mu m, and a biaxially oriented polyester film produced by Xiamen Long Plastic industry Co.
The preparation process of the puffed food packaging film with the thickness of 107 μm in the embodiment is as follows:
s1) corona: carrying out corona treatment on the composite surface of the BOPET film, wherein the corona value is 45 dynes;
s2) printing: printing ink on the composite surface of the BOPET film subjected to corona treatment by using printing equipment to form a printing layer, and drying;
s3) sizing: coating a layer of adhesive on one side of the nylon layer, the barrier layer, the anti-fouling heat sealing layer and the printing layer in the step S2), wherein the adhesive on the printing layer is coated on one side of the printing ink layer, and the gluing amount is 3.8g/m2；
S4) compounding: and (4) drawing the glued layers in the step S3) to a compounding machine, sequentially placing the glued layers according to the sequence of the printing layer, the barrier layer, the nylon layer and the anti-fouling heat sealing layer, wherein one surface of the adhesive is placed between every two layers, and compounding the layers through the compounding machine to obtain the puffed food packaging film.
In this embodiment, an on-line electronic cross-linking processing method for a puffed food packaging film with a thickness of 107 μm, as shown in fig. 1, includes the following steps: drawing the puffed food packaging film obtained by compounding in the step S4) onto an online cross-linking device, wherein the online cross-linking device comprises a scanning electron accelerator and a transmission device, the transmission device consists of a plurality of cooling guide rollers, and the plurality of cooling guide rollers are distributed into two rows and are respectively positioned at two sides of an electron beam emission path of the scanning electron accelerator; the cooling guide rollers are of a through structure, and a cooling medium is filled in the cavities; opening the scanning electron accelerator, emitting electron beams, wherein the irradiation dose of the electron beams is 200-2000Kev, the electron cross-linking beam current is 3ma, the electron cross-linking power is 80KW, the electron processing speed is 10m/min, and the processing dose is 15 Mrad; connecting the cooling medium in the cavities of the cooling guide rollers for continuous cooling; walk the puffed food packaging film of pending on online cross-linking device from last to walking down, control one by one the cooling deflector roll conveys, is in simultaneously carry out many times cross-linking under the effect of the electron beam of scanning formula electron accelerator transmission, carries out the edge planing rolling to the puffed food packaging film after the cross-linking is accomplished.
Example 2
The 127-micron-thickness puffed food packaging film is prepared by a multilayer co-extrusion process, and sequentially comprises an anti-pollution heat sealing layer, a nylon layer, a blocking layer and a printing layer from inside to outside, wherein the layers are directly bonded through an adhesive, and the using amount of the adhesive is 4.2g/m2；
Wherein:
the anti-pollution heat sealing layer is an RCPP film, and the thickness of the anti-pollution heat sealing layer is 90 micrometers;
the barrier layer is a VMCPP aluminum-plated film with the thickness of 10 mu m;
the nylon layer is a BOPA film, and the thickness of the nylon layer is 15 micrometers;
the printing layer is a BOPET film with the thickness of 12 mu m.
The preparation process of the puffed food packaging film with the thickness of 127 μm in the embodiment is as follows:
s1) corona: carrying out corona treatment on the composite surface of the BOPET film, wherein the corona value is 55 dynes;
s2) printing: printing ink on the composite surface of the BOPET film subjected to corona treatment by using printing equipment to form a printing layer, and drying;
s3) sizing: coating a layer of adhesive on one side of the nylon layer, the barrier layer, the anti-fouling heat sealing layer and the printing layer in the step S2), wherein the adhesive on the printing layer is coated on one side of the printing ink layer, and the gluing amount is 4.2g/m2；
S4) compounding: and (4) drawing the glued layers in the step S3) to a compounding machine, sequentially placing the glued layers according to the sequence of the printing layer, the barrier layer, the nylon layer and the anti-fouling heat sealing layer, wherein one surface of the adhesive is placed between every two layers, and compounding the layers through the compounding machine to obtain the puffed food packaging film.
The online electronic crosslinking treatment method for the puffed food packaging film with the thickness of 127 micrometers in the embodiment comprises the following steps: drawing the puffed food packaging film obtained by compounding in the step S4) onto an online cross-linking device, wherein the online cross-linking device comprises a scanning electron accelerator and a transmission device, the transmission device consists of a plurality of cooling guide rollers, and the plurality of cooling guide rollers are distributed into two rows and are respectively positioned at two sides of an electron beam emission path of the scanning electron accelerator; the cooling guide rollers are of a through structure, and a cooling medium is filled in the cavities; opening the scanning electron accelerator, emitting electron beams, wherein the irradiation dose of the electron beams is 200-2000Kev, the electron cross-linking beam current is 7ma, the electron cross-linking power is 100KW, the electron processing speed is 20m/min, and the processing dose is 15 Mrad; connecting the cooling medium in the cavities of the cooling guide rollers for continuous cooling; walk the puffed food packaging film of pending on online cross-linking device from last to walking down, control one by one the cooling deflector roll conveys, is in simultaneously carry out many times cross-linking under the effect of the electron beam of scanning formula electron accelerator transmission, carries out the edge planing rolling to the puffed food packaging film after the cross-linking is accomplished.
Example 3
The puffed food package of this example having a thickness of 109 μmThe film is prepared by a multilayer co-extrusion process, and sequentially comprises an anti-pollution heat sealing layer, a nylon layer, a barrier layer and a printing layer from inside to outside, wherein the layers are directly bonded by an adhesive, and the using amount of the adhesive is 4.2g/m2；
Wherein:
the anti-pollution heat sealing layer is an RCPP film, and the thickness of the anti-pollution heat sealing layer is 70 mu m;
the barrier layer is a VMCPP aluminum-plated film with the thickness of 12 mu m;
the nylon layer is a BOPA film, and the thickness of the nylon layer is 15 micrometers;
the printing layer is a BOPET film with the thickness of 12 mu m.
The preparation process of the puffed food packaging film with the thickness of 109 μm in the embodiment is as follows:
s1) corona: carrying out corona treatment on the composite surface of the BOPET film, wherein the corona value is 45 dynes;
s2) printing: printing ink on the composite surface of the BOPET film subjected to corona treatment by using printing equipment to form a printing layer, and drying;
s3) sizing: coating a layer of adhesive on one side of the nylon layer, the barrier layer, the anti-fouling heat-sealing layer and the printing layer in the step S2), wherein the adhesive on the printing layer is coated on one side of the printing ink layer, and the gluing amount is 4.2g/m 2;
s4) compounding: and (4) drawing the glued layers in the step S3) to a compounding machine, sequentially placing the glued layers according to the sequence of the printing layer, the barrier layer, the nylon layer and the anti-fouling heat sealing layer, wherein one surface of the adhesive is placed between every two layers, and compounding the layers through the compounding machine to obtain the puffed food packaging film.
The online electronic crosslinking treatment method for the puffed food packaging film with the thickness of 109 micrometers in the embodiment comprises the following steps: drawing the puffed food packaging film obtained by compounding in the step S4) onto an online cross-linking device, wherein the online cross-linking device comprises a scanning electron accelerator and a transmission device, the transmission device consists of a plurality of cooling guide rollers, and the plurality of cooling guide rollers are distributed into two rows and are respectively positioned at two sides of an electron beam emission path of the scanning electron accelerator; the cooling guide rollers are of a through structure, and a cooling medium is filled in the cavities; opening the scanning electron accelerator, emitting electron beams, wherein the irradiation dose of the electron beams is 200-2000Kev, the electron cross-linking beam current is 10ma, the electron cross-linking power is 120KW, the electron processing speed is 30m/min, and the processing dose is 15 Mrad; connecting the cooling medium in the cavities of the cooling guide rollers for continuous cooling; walk the puffed food packaging film of pending on online cross-linking device from last to walking down, control one by one the cooling deflector roll conveys, is in simultaneously carry out many times cross-linking under the effect of the electron beam of scanning formula electron accelerator transmission, carries out the edge planing rolling to the puffed food packaging film after the cross-linking is accomplished.
Example 4
This example differs from example 3 only in that: in the online electron crosslinking treatment method, the irradiation dose of an electron beam is 200-2000Kev, the electron crosslinking beam current is 15ma, the electron crosslinking power is 150KW, the electron treatment speed is 40m/min, and the treatment dose is 15 Mrad.
Comparative example 1
The puffed food packaging film with the thickness of 109 micrometers is prepared by a multilayer co-extrusion process and sequentially comprises an anti-pollution heat sealing layer, a nylon layer, a blocking layer and a printing layer from inside to outside, wherein the layers are directly bonded through an adhesive, and the using amount of the adhesive is 4.2g/m2；
Wherein:
the anti-pollution heat sealing layer is an RCPP film, and the thickness of the anti-pollution heat sealing layer is 70 mu m;
the barrier layer is a VMCPP aluminum-plated film with the thickness of 12 mu m;
the nylon layer is a BOPA film, and the thickness of the nylon layer is 15 micrometers;
the printing layer is a BOPET film with the thickness of 12 mu m.
The preparation process of the puffed food packaging film with the thickness of 109 μm in the embodiment is as follows:
s1) corona: carrying out corona treatment on the composite surface of the BOPET film, wherein the corona value is 45 dynes;
s2) printing: printing ink on the composite surface of the BOPET film subjected to corona treatment by using printing equipment to form a printing layer, and drying;
s3) sizing:coating a layer of adhesive on one side of the nylon layer, the barrier layer, the anti-fouling heat sealing layer and the printing layer in the step S2), wherein the adhesive on the printing layer is coated on one side of the printing ink layer, and the gluing amount is 4.2g/m2；
S4) compounding: drawing the glued layers in the step S3) onto a compound machine, and sequentially placing the glued layers according to the sequence of the printing layer, the barrier layer, the nylon layer and the anti-fouling heat-sealing layer, wherein one surface of the adhesive is placed between every two layers, and compounding the layers through the compound machine to obtain the puffed food packaging film;
s5) rolling: rolling the puffed food packaging film obtained in the step S4);
s6) curing: curing the puffed food packaging film compounded in the step S5), wherein the curing temperature is 60 ℃, and the curing time is 48 hours;
s7) slitting: cutting the cured coiled material obtained in the step S6) according to the specification requirement, and then rolling again.
Comparative example 2
The puffed food packaging film with the thickness of 94 microns is prepared by a multilayer co-extrusion process and sequentially comprises an anti-pollution heat sealing layer, a nylon layer, a blocking layer and a printing layer from inside to outside, the layers are directly bonded through an adhesive, and the using amount of the adhesive is 4.2g/m2；
Wherein:
the anti-pollution heat sealing layer is an RCPP film, and the thickness of the anti-pollution heat sealing layer is 70 mu m;
the barrier layer is a VMCPP aluminum-plated film with the thickness of 12 mu m;
the printing layer is a BOPET film with the thickness of 12 mu m.
The procedure of the preparation process of this example is the same as in comparative example 1.
The parameters and results of the electron crosslinking treatment of examples 1 to 4 are shown in Table 1, using a scanning electron accelerator.
TABLE 1
Figure BDA0002344258380000071
Figure BDA0002344258380000081
Testing method and testing result of the puffed food packaging film:
the expanded food packaging films obtained in examples 1 to 4 and comparative examples 1 to 2 were subjected to heat-seal strength, tensile strength, elongation at break, degree of crosslinking, dart impact and oxygen barrier property tests in accordance with QB/T2358-1998, ASTM D882, ASTM D2765-68, GB 9639 and ASTM D3985, respectively, and the test data are shown in Table 2 below:
TABLE 2
Figure BDA0002344258380000082
As can be seen from Table 2, the heat sealing strength and the crosslinking degree of the puffed food packaging film treated by the online electronic crosslinking method are obviously higher than those of the puffed food packaging film which is not subjected to electronic crosslinking treatment; example 4 in the electronic cross-linking process using higher parameters, overall performance is better, but cost is relatively higher, cross-linking degree and heat seal strength are also reduced; the comprehensive properties of the embodiment 2 and the embodiment 3 in the aspects of tensile strength, elongation at break and the like are good, and the application can be selected according to the actual production situation.
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 intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. The packaging film for the puffed food is characterized by comprising an anti-pollution heat sealing layer, a nylon layer, a blocking layer and a printing layer from inside to outside, wherein the layers are directly bonded through an adhesive, and the using amount of the adhesive is 3.8-4.2 g/m2；
Wherein:
the anti-pollution heat sealing layer is an RCPP film, and the thickness of the anti-pollution heat sealing layer is 60-90 mu m;
the barrier layer is a VMCPP aluminum-plated film, and the thickness of the barrier layer is 10-20 mu m;
the nylon layer is a BOPA film, and the thickness of the nylon layer is 15 micrometers;
the printing layer is a BOPET film with the thickness of 12 mu m.
2. The expanded food packaging film of claim 1, wherein the adhesive is a high temperature cooking adhesive.
3. The expanded food packaging film of claim 1, wherein the anti-contaminant heat seal layer has a thickness of 70 μm.
4. The puffed food packaging film of claim 1, wherein the barrier layer has a thickness of 12 μm.
5. The packaging film for expanded foods according to claim 1, wherein the RCPP film is selected from a cooking grade of 121 ℃ or higher.
6. A method of making the puffed food packaging film of any of claims 1-5, comprising the steps of:
s1) corona: carrying out corona treatment on the composite surface of the BOPET film;
s2) printing: printing ink on the composite surface of the BOPET film subjected to corona treatment by using printing equipment to form a printing layer, and drying;
s3) sizing: coating a layer of adhesive on one side of the nylon layer, the barrier layer, the anti-fouling heat-sealing layer and the printing layer in the step S2), wherein the adhesive on the printing layer is coated on one side of the printing ink layer;
s4) compounding: and (4) drawing the glued layers in the step S3) to a compounding machine, sequentially placing the glued layers according to the sequence of the printing layer, the barrier layer, the nylon layer and the anti-fouling heat sealing layer, wherein one surface of the adhesive is placed between every two layers, and compounding the layers through the compounding machine to obtain the puffed food packaging film.
7. The method of preparing the puffed food packaging film according to claim 6, wherein the corona value of the corona treatment of the clad surface in step S1) is 45 to 55 dynes.
8. An in-line electronic cross-linking treatment method for a puffed food packaging film according to any of claims 1 to 7, comprising the steps of: drawing the puffed food packaging film obtained by compounding in the step S4) onto an online cross-linking device, wherein the online cross-linking device comprises a scanning electron accelerator and a transmission device, the transmission device consists of a plurality of cooling guide rollers, and the plurality of cooling guide rollers are distributed into two rows and are respectively positioned at two sides of an electron beam emission path of the scanning electron accelerator; the cooling guide rollers are of a through structure, and a cooling medium is filled in the cavities; opening the scanning electron accelerator, emitting electron beams, wherein the irradiation dose of the electron beams is 200-2000Kev, the electron cross-linking beam current is 3-15ma, the electron cross-linking power is 80-150KW, the electron processing speed is 10-40m/min, and the processing dose is 15 Mrad; connecting the cooling medium in the cavities of the cooling guide rollers for continuous cooling; walk the puffed food packaging film of pending on online cross-linking device from last to walking down, control one by one the cooling deflector roll conveys, is in simultaneously carry out many times cross-linking under the effect of the electron beam of scanning formula electron accelerator transmission, carries out the edge planing rolling to the puffed food packaging film after the cross-linking is accomplished.
9. The method of claim 8, wherein the cooling temperature of the cooling roller is 12 ℃.
CN201911388511.4A 2019-12-30 2019-12-30 Puffed food packaging film, preparation method thereof and online electronic crosslinking treatment Pending CN113119564A (en)

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CN201911388511.4A CN113119564A (en) 2019-12-30 2019-12-30 Puffed food packaging film, preparation method thereof and online electronic crosslinking treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911388511.4A CN113119564A (en) 2019-12-30 2019-12-30 Puffed food packaging film, preparation method thereof and online electronic crosslinking treatment

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CN113119564A true CN113119564A (en) 2021-07-16

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Application publication date: 20210716