CN111703170B - Self-supporting bag packaging material capable of being torn and opened linearly and preparation method thereof - Google Patents

Self-supporting bag packaging material capable of being torn and opened linearly and preparation method thereof Download PDF

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CN111703170B
CN111703170B CN202010641189.8A CN202010641189A CN111703170B CN 111703170 B CN111703170 B CN 111703170B CN 202010641189 A CN202010641189 A CN 202010641189A CN 111703170 B CN111703170 B CN 111703170B
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layer
film
self
density polyethylene
tension
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CN111703170A (en
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胡凯
方仕臣
王卫民
方坚
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Huangshan Novel Co Ltd
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Huangshan Novel 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/085—Layered products comprising a layer of metal comprising metal 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 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C08J2423/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention relates to a self-supporting bag packaging material capable of being torn and opened linearly and a preparation method thereof, belonging to the technical field of self-supporting bags. The interlayer peeling force of the composite membrane material of the self-supporting bag prepared by the invention is 3-3.5N/15mm, which is beneficial to the easy tearing property of the composite membrane; the Elmendorf has low tearing strength, so that the prepared self-standing bag can be easily torn; the easy-to-tear line can be torn by hand without tearing the easy-to-tear opening, the easy-to-tear line can be torn easily without laser, and the easy-to-tear opening is in a linear state; user experience is greatly improved.

Description

Self-supporting bag packaging material capable of being torn and opened linearly and preparation method thereof
Technical Field
The invention relates to the field of self-supporting bags, in particular to a self-supporting bag packaging material capable of being torn and opened linearly and a preparation method thereof.
Background
At present, in order to open the self-supporting bag in the market, U-shaped, V-shaped or straight-line-shaped easy-to-tear openings are formed in two sides of the self-supporting bag, so that a user can tear the self-supporting bag easily. However, the self-supporting bag plastic film is formed by compounding multiple layers, and the easy tearing degrees are different due to different molecular orientation structures of the film materials of the layers, so that the composite film is difficult to tear. The phenomena that the tearing opening of the bag surface is not neat and the contents are spilled out often occur when the self-supporting bag is torn; or when the zipper self-standing bag is torn by hand, the tearing opening is easily torn to the zipper heat-sealing area, so that the zipper is repeatedly sealed and is not firm, air leakage is caused, and the zipper self-standing bag loses the function of repeated use.
In order to solve the problems, a process that a part of the self-supporting bag adopts laser easy-to-tear lines is that the internal structure of the material is damaged on the surface of the bag in a laser burning mode, so that the self-supporting bag is torn and opened linearly, and better user experience of consumers is achieved. However, this form still has significant disadvantages: 1. the two sides of the bag surface are still required to be provided with easy-to-tear openings, which affects the appearance; 2. the depth degree of the laser easy-to-tear line is difficult to balance, the laser easy-to-tear line is shallow and cannot achieve the effect of easy tearing, and the laser easy-to-tear line is deep and is easy to damage and leak air of the standing bag, so that the food safety problem occurs.
Disclosure of Invention
In order to solve the technical problems, the invention provides a self-standing bag packaging material capable of being torn and opened linearly and a preparation method thereof.
In order to realize one of the purposes of the invention, the invention adopts the following technical scheme:
the self-supporting bag packaging material is a composite film, the composite film comprises a BOPP film layer, an ink layer, an aluminum foil layer and a PE layer which are sequentially attached, and the PE layer comprises a corona layer, a middle layer and a heat sealing layer;
the corona layer comprises 50-75 wt% of linear low density polyethylene, 20-50 wt% of low density polyethylene and 0.2-2 wt% of processing aid;
the middle layer comprises 30 to 70 weight percent of linear low density polyethylene, 20 to 60 weight percent of high density polyethylene and 5 to 20 weight percent of polybutene;
the heat sealing layer comprises 40-70 wt% of metallocene linear low density polyethylene, 30-60 wt% of high density polyethylene, 1-5 wt% of opening master batch and 1-5 wt% of slipping agent.
Preferably, the corona layer comprises 66.3 wt% of a medium petrochemical Yankee 7042 linear low density polyethylene, 33.3 wt% of an Exxon 150BW low density polyethylene, and 0.4 wt% of a fluorine processing aid having a color designation of 100991-K.
Preferably, the intermediate layer comprises 50.0% by weight of linear low density polyethylene having the trade name medium petrochemical yangzi 7042, 40.0% of high density polyethylene having the trade name thailand petrochemical HD3355F and 10.0% of polybutene having the trade name dutch basel PB 0110.
Preferably, the heat-seal layer comprises 53.9 wt% of SP0540 metallocene linear low density polyethylene of Mitsui Japan, 43.0 wt% of high density polyethylene of petrochemical HD3355F of Thailand, 1.6 wt% of open-ended master batch of Beijing Asian AB-20LD and 1.5 wt% of slipping agent of ESQ-4 of Mitsui Japan.
Preferably, the thicknesses of the BOPP film layer, the ink layer, the aluminum foil layer and the PE layer are 20um, 1um, 9um and 50um in sequence; the thickness ratio of the corona layer, the middle layer and the heat sealing layer is 2: 5: 3; the BOPP film layer is the brand SF-01 produced by Hongyun Senfu.
Another object of the present invention is to provide a process for preparing a self-supporting pouch packaging material capable of being torn and opened linearly, comprising the steps of:
s1, printing process: printing a layer of printing ink on the surface of a BOPP film at the printing speed of 150-250m/min, and drying and curing the printing ink at the temperature of 40-60 ℃ to form a printing ink layer;
s2, film blowing process: respectively weighing the components in parts by weight according to the formula composition of a corona layer, an intermediate layer and a heat-sealing layer in the PE blown film, and then adopting a three-layer co-extrusion blown film process to prepare a PE layer;
s3, primary compounding: carrying out dry compounding on the BOPP film layer with the ink layer and the aluminum foil layer under the action of compound glue to form a primary composite structure;
s4, secondary compounding: and carrying out dry compounding on the primary composite structure and the PE layer under the action of the composite glue to form the composite film.
Preferably, the dry-type compound glue is two-component glue of Rohm and Haas 811A/COREACTANTF, the glue comprises Rohm and Haas 811A, COREACTANTF and ethyl ester, and the mass ratio of Rohm and Haas 811A, COREACTANTF to ethyl ester is 10:1.2: 9.
Preferably, the process parameters of the primary compounding are controlled as follows: the speed of the vehicle is 120 +/-10 m/min, the first release tension is 80 +/-20N, the extraction tension is 40 +/-20N, the second release tension is 160 +/-40N, the drying tunnel tension is 20 +/-10N, and the winding tension is 200 plus 280N, wherein the winding mode adopts a linear taper decreasing mode.
Preferably, the process parameters of the secondary compounding are controlled as follows: the speed of the vehicle is 130 +/-20 m/min, the first release tension is 60 +/-20N, the extraction tension is 100 +/-20N, the second release tension is 50 +/-10N, the drying tunnel tension is 100 +/-20N, and the winding tension is 100 plus 180N, wherein the winding mode adopts a linear taper decreasing mode.
Compared with the prior art, the invention has the beneficial effects that:
1) the interlayer peeling force of the composite membrane material of the self-supporting bag prepared by the invention is 3-3.5N/15mm, which is beneficial to the easy tearing property of the composite membrane; the Elmendorf has low tearing strength, so that the prepared self-supporting bag can be easily torn; the easy-to-tear line can be torn by hand without tearing the easy-to-tear opening, the easy-to-tear line can be torn easily without laser, and the easy-to-tear opening is in a linear state; user experience is greatly improved.
2) The linear low density polyethylene (LLDPE, melt index 2.0g/10min, density 0.920 g/cm) with the trademark of Yangzi 7042 produced by petrochemical is used in the corona layer of the composite film of the invention3) The particle has the characteristics of excellent physical and mechanical properties, easiness in corona, lower cost and the like; low density polyethylene (LDPE, melt index 0.75g/10min, density 0.923 g/cm) produced by Exxon under the designation 150BW3) The particle has few molecular branch chains, and the molecules are less entangled after polymerization, so the particle is easy to tear longitudinally and transversely. Fluorine processing aid with designation 100991-K for color safety and color production for improving molten resinThe fluidity of (2) enables the film to be smooth and transparent after film formation.
3) The main material of the middle layer of the composite film is consistent with that of the heat-sealing layer Yangzi 7042, and the mechanical property of the middle layer is kept. Additionally, 40% of HD3355F (HDPE, melt index 1.1g/10min, density 0.951 g/cm) produced by Thailand petrochemical production is added3) The particle has high melt index, excellent size stability, impact resistance and stiffness, and the high stiffness is beneficial to the easy tearing property of the composite film. Simultaneously adding polybutene PB0110 (melt index 12.0g/10min, density 0.903 g/cm)3) The polyethylene film is uniformly dispersed in a heat sealing layer, has slow crystallization kinetics so as to have excellent wettability, and has high sensitive shear fluidity so as to be easily dispersed in a polymer to form a uniform two-phase structure, so that the acting force between original polyethylene molecules is destroyed, the molecules are reoriented, and the tearability of the polyethylene film can be obviously improved. After the three resins are mixed, the film after casting has better stiffness and proper softness, and the longitudinal and transverse easy tearing performance is further improved.
4) The heat-sealing layer of the composite film of the invention uses Japan Mitsui SP0540(mLLDPE, melt index 3.8g/10min, density 0.916 g/cm)3) The particle has good longitudinal and transverse easy tearing property, good heat sealing performance and low-temperature heat sealing effect. The addition of HD3355F also increases the mechanical properties and stiffness of the composite film, which is more beneficial to reducing the tearing force of the composite film. The opening master batch with the brand of AB-20LD produced by Beijing Asian can reduce the surface friction coefficient of the membrane, so that the composite membrane has good opening performance. The slipping agent which is produced by the Japan three-well and is of the ESQ-4 brand can be effectively matched with the stable surface friction coefficient of SP2020, and is beneficial to smooth film-making in the bag-making process.
5) In the preparation method of the composite membrane, dry-compounding technology is used for both primary compounding and secondary compounding of the composite membrane, and Rohm and Haas 811A/COREACTANT F double-component glue is selected. The drying process has excellent glue leveling property, high-strength peeling strength and excellent shearing property. The Rohm and Hass 811A/COREACTANT F double-component glue has excellent leveling property, super-strong bonding property and excellent medium resistance, has good affinity with aluminum foil, is resistant to boiling and steaming, and provides stable thickness uniformity, excellent physical and mechanical properties (mainly including interlayer peeling force, heat sealing and tearing force), environment resistance and medium resistance for the composite film. The obtained self-supporting bag can be used for packaging various contents, and the use of the self-supporting bag is increased.
6) The winding mode of the invention adopts a line taper decreasing mode. According to the principle of moment balance, the winding tension is decreased gradually in an inverse ratio mode along with the continuous increase of the diameter of the film roll; according to the set taper value, a linear descending is formed; the rolling mode can ensure that the composite film rolled after compounding has uniform tension dispersion and flat film surface of the composite film, is beneficial to no curling, no wrinkles and smoothness of the standing bag after bag making, and further is beneficial to linearity of tearing of the bag, so that the smoothness and thickness stability of the composite film can be maintained in an auxiliary manner.
7) The invention utilizes a KURABO sizing amount monitoring system to ensure the uniformity and stability of the sizing amount of the glue, thereby improving the thickness stability and the bonding strength of the composite film and further improving the easy tearing property of the composite film.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic flow diagram of the present invention;
FIG. 3 is a schematic view of the test method for straight line tear of the present invention, FIG. 1;
FIG. 4 is a schematic illustration of the straight line tear test method of the present invention 2;
FIG. 5 is a schematic illustration of the straight line tear test method of the present invention 3;
the designations in the drawings have the following meanings:
1-BOPP film layer, 2-ink layer, 3-aluminum foil layer and 4-PE 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.
The embodiment of the invention discloses a self-supporting bag packaging material capable of being torn and opened linearly, wherein the self-supporting bag packaging material is a composite film, the composite film comprises a BOPP film layer 1, an ink layer 2, an aluminum foil layer 3 and a PE layer 4 which are sequentially attached, and the PE layer 4 comprises a corona layer, a middle layer and a heat sealing layer;
the corona layer comprises 50 wt% -75 wt% of linear low density polyethylene, 20 wt% -50 wt% of low density polyethylene and 0.2 wt% -2 wt% of processing aid;
the middle layer comprises 30-70 wt% of linear low density polyethylene, 20-60 wt% of high density polyethylene and 5-20 wt% of polybutene;
the heat sealing layer comprises 40-70 wt% of metallocene linear low density polyethylene, 30-60 wt% of high density polyethylene, 1-5 wt% of opening master batch and 1-5 wt% of slipping agent.
The thicknesses of the BOPP film layer 1, the ink layer 2, the aluminum foil layer 3 and the PE layer 4 are 20um, 1um, 9um and 50um in sequence; the thickness ratio of the corona layer, the middle layer and the heat sealing layer is 2: 5: 3.
Correspondingly, the invention also provides a preparation process of the self-supporting bag packaging material capable of being torn and opened linearly, which comprises the following steps:
s1, printing process: printing a layer of printing ink on the surface of the BOPP film at the printing speed of 150-250m/min, and drying and curing the printing ink at the temperature of 40-60 ℃ to form a printing ink layer 2;
s2, film blowing process: respectively weighing the components in parts by weight according to the formula composition of a corona layer, an intermediate layer and a heat-sealing layer in the PE blown film, and then adopting a three-layer co-extrusion blown film process to prepare a PE layer 4;
s3, primary compounding: carrying out dry compounding on the BOPP film layer 1 with the ink layer 2 and the aluminum foil layer 3 under the action of compound glue to form a primary composite structure;
s4, secondary compounding: and carrying out dry compounding on the primary composite structure and the PE layer 4 under the action of the composite glue to form a composite film.
The dry-type compound glue is a Rohm and Haas 811A/COREACTANTF double-component glue, the glue comprises Rohm and Haas 811A, COREACTANTF and ethyl ester, and the mass ratio of Rohm and Haas 811A, COREACTANTF to ethyl ester is 10:1.2: 9.
More specifically, the process parameters of the primary compounding are controlled as follows: the speed of the vehicle is 120 +/-10 m/min, the first release tension is 80 +/-20N, the extraction tension is 40 +/-20N, the second release tension is 160 +/-40N, the drying tunnel tension is 20 +/-10N, and the winding tension is 200-. The technological parameters of the secondary compounding are controlled as follows: the speed of the vehicle is 130 +/-20 m/min, the first releasing tension is 60 +/-20N, the leading-out tension is 100 +/-20N, the second releasing tension is 50 +/-10N, the tension of the drying tunnel is 100 +/-20N, and the winding tension is 100 plus 180N, wherein the winding mode adopts a linear taper decreasing mode.
In the following examples, the linear low density polyethylenes are all 7042 produced by the petrochemical Yangzi; the low density polyethylene is 150BW produced by Exxon; the fluorine processing aids are 100991-K produced by color matching; the high-density polyethylene is HD3355F produced by Thailand petrochemical industry; polybutene is PB0110 produced by Basel, Netherlands; the metallocene linear low density polyethylene is SP0540 produced by Mitsui Japan; the high-density polyethylene is HD3355F produced by Thailand petrochemical industry; the opening master batch is AB-20LD produced by Beijing Asian; the slipping agent is ESQ-4 produced by Mitsui Japan; the BOPP film layer 1 is SF-01 produced by Hongyun Senfu.
Example 1
S1, printing process: printing a layer of printing ink on the surface of a BOPP film at the printing speed of 150m/min, and drying and curing the printing ink at the temperature of 40 ℃ to form a printing ink layer 2;
s2, film blowing process: the corona layer raw material, the middle layer raw material and the heat sealing layer raw material are respectively added into three material cylinders of a co-extrusion machine, and the formula is as follows:
corona layer: 50 wt% of linear low density polyethylene, 49.8 wt% of low density polyethylene and 0.2 wt% of processing aid;
an intermediate layer: 35 wt% of linear low density polyethylene, 60 wt% of high density polyethylene and 5 wt% of polybutene;
heat sealing layer: 40 wt% of metallocene linear low-density polyethylene, 58 wt% of high-density polyethylene, 1 wt% of opening master batch and 1 wt% of slipping agent.
Then a three-layer co-extrusion film blowing process is adopted to prepare a film, and a PE layer 4 is prepared;
s3, primary compounding: carrying out dry compounding on the BOPP film layer 1 with the ink layer 2 and the aluminum foil layer 3 under the action of compound glue to form a primary composite structure;
s4, secondary compounding: and carrying out dry compounding on the primary composite structure and the PE layer 4 under the action of the composite glue to form a composite film.
Example 2
S1, printing process: printing a layer of printing ink on the surface of a BOPP film at the printing speed of 200m/min, and drying and curing the printing ink at 50 ℃ to form a printing ink layer 2;
s2, film blowing process: the corona layer raw material, the middle layer raw material and the heat sealing layer raw material are respectively added into three material cylinders of a co-extrusion machine, and the formula is as follows:
corona layer: 66.3 wt% of linear low density polyethylene, 33.3 wt% of low density polyethylene and 0.4 wt% of processing aid;
intermediate layer: 50.0 wt% of linear low density polyethylene, 40.0% of high density polyethylene and 10.0% of polybutene;
heat sealing layer: 53.9 wt% of metallocene linear low-density polyethylene, 43.0 wt% of high-density polyethylene, 1.6 wt% of opening master batch and 1.5 wt% of slipping agent.
Then a three-layer co-extrusion film blowing process is adopted to prepare a film, and a PE layer 4 is prepared;
s3, primary compounding: carrying out dry compounding on the BOPP film layer 1 with the ink layer 2 and the aluminum foil layer 3 under the action of compound glue to form a primary composite structure;
s4, secondary compounding: and carrying out dry compounding on the primary composite structure and the PE layer 4 under the action of the composite glue to form a composite film.
Example 3
S1, printing process: printing a layer of printing ink on the surface of a BOPP film at the printing speed of 250m/min, and drying and curing the printing ink at the temperature of 60 ℃ to form a printing ink layer 2;
s2, film blowing process: the corona layer raw material, the middle layer raw material and the heat sealing layer raw material are respectively added into three material cylinders of a co-extrusion machine, and the formula is as follows:
corona layer: 75 wt% of linear low density polyethylene, 23 wt% of low density polyethylene and 2 wt% of processing aid;
an intermediate layer: 70 wt% of linear low density polyethylene, 30 wt% of high density polyethylene and 20 wt% of polybutene;
heat sealing layer: 40 wt% of metallocene linear low-density polyethylene, 50 wt% of high-density polyethylene, 5 wt% of opening master batch and 5 wt% of slipping agent.
Then a three-layer co-extrusion film blowing process is adopted to prepare a film, and a PE layer 4 is prepared;
s3, primary compounding: carrying out dry compounding on the BOPP film layer 1 with the ink layer 2 and the aluminum foil layer 3 under the action of compound glue to form a primary composite structure;
s4, secondary compounding: and carrying out dry compounding on the primary composite structure and the PE layer 4 under the action of the composite glue to form a composite film.
Comparative example 1
S1, printing process: printing a layer of printing ink on the surface of a BOPP film at the printing speed of 200m/min, and drying and curing the printing ink at the temperature of 55 ℃ to form a printing ink layer 2; wherein the BOPP film is produced by the national wind plastic industry;
s2, a film blowing process: the corona layer raw material, the middle layer raw material and the heat sealing layer raw material are respectively added into three material cylinders of a co-extrusion machine, and the formula is as follows:
corona layer: 60 wt% of 7042 linear low density polyethylene with a trade mark of medium petrochemical Yangzi, 38 wt% of 2420H low density polyethylene with a trade mark of Yangzi Basff Heyu, and 2 wt% of fluorine processing aid with a trade mark of Anhuan 100991-K;
an intermediate layer: 60 wt% of 7042 linear low density polyethylene with a trade mark of medium petrochemical Yangjingguan, and 40 wt% of 2420H low density polyethylene with a trade mark of YangZi Basff Heyue company;
heat sealing layer: 1881 metallocene Linear Low Density polyethylene manufactured by Dow chemical USA 50 wt%, 2420H low Density polyethylene manufactured by Yangzi Basff Co., Ltd 47 wt%, smooth master batch manufactured by Ann color 100991-K1.5 wt% and shedding master batch manufactured by Yalun AB-20LD 1.5 wt%.
Then a three-layer co-extrusion film blowing process is adopted to prepare the film, and the PE layer 4 is prepared.
S3, compounding: carrying out dry compounding on the BOPP film layer 1 with the ink layer 2 and the aluminum foil layer 3 under the action of primary compound glue to form a primary compound structure; and then the primary composite structure and the PE layer 4 are subjected to dry-type compounding under the action of secondary compound glue to form a composite film. Wherein the primary composite glue is 8950A, 8950B and ethyl ester of Beijing GaoUnion, and the mass ratio of 8950A, 8950B and ethyl ester is 20:2.4: 20; the secondary composite glue is SY-03A, SY-03B and ethyl ester of Beijing GaoUnion, and the mass ratio of the SY-03A, SY-03B to the ethyl ester is 20:4.8: 30.
Table 1 below shows the raw material ratios for the blown film process in the preparation of the stand-up pouch packaging material of example 2:
table 1
Figure BDA0002571184770000091
Figure BDA0002571184770000101
The composite films from example 2 and comparative example 1 were formed into stand-up pouches and the test data obtained are shown in tables 2 and 3 below:
table 2
Test item Example 2 stand-up pouch Self-supporting bag obtained in comparative example 1
Deviation in thickness% ±5％ 5％-10％
Coefficient of friction 0.2-0.3 0.1-0.5
Interlaminar Peel force (BOPP/AL) (N/15mm) TD3.5；MD3.2 TD2.0；MD1.8
Interlaminar peeling force (AL/PE) (N/15mm) TD10.6；MD9.8 TD8.3；MD7.5
Elmendorf tear force (N) MD0.5TD0.6 MD0.8TD0.8
Table 3 straight line tear test data: cm
Figure BDA0002571184770000102
As can be seen from table 1 above, the interlaminar peel force for the stand-up bag made in comparative example 1 was TD2.0, MD1.8, substantially in the range of 1-2N/15mm, and the elmendorf tear strength MD0.8 TD0.8, while the interlaminar peel force for the stand-up bag made in example 2 of the present invention was TD 3.5; MD3.2, and Elmendorf tear strength MD0.5 TD0.6, namely the interlaminar peeling force of the composite film in the invention is greater than that of the composite film in comparative example 1, thus being more beneficial to the easy tearing of the composite film; and the Elmendorf tear strength of the composite film of the invention is less than that of the composite film of comparative example 1, so that the prepared self-standing bag can be easily torn, and the tearing opening is in a linear state.
As can be seen from table 2 above, the self-supporting bags obtained in example 2 according to the present invention all had linear tearability values of about 19cm, whereas the self-supporting bags obtained in comparative example 1 all had linear tearability values of about 15cm, and the closer the linear tearability value was to 20cm, the smaller the tear deviation distance, the better the tearing effect, and therefore the self-supporting bags obtained using the composite film according to the present invention were more easily torn and the better the user experience.
The filter in the above embodiment has a mesh size of about 20/20/150/20 meshes and a mesh size of about 80u, which may otherwise cause the formation of crystal points on the film; the winding must adopt the winding mode of surface centering, and adopt the low-pressure winding, avoid the film roll winding tension is too big to lead to the membrane to be cohered seriously; because the formula contains high proportion of HDPE, the adjustment of the bubble type is very important in the production process, the control of external cold air is as small as possible, and the cooling effect of the film bubble is reduced; meanwhile, the control of the extrusion amount is moderate, the excessively high extrusion amount can prevent wrinkling, but also can increase the probability of occurrence of crystal points and poor plasticizing points, and the excessively low extrusion amount is very unfavorable for the adjustment of the bubble type, namely unfavorable for the thick film uniformity of the thin film; need maintain and inspect the thickness control system of WH inflation film manufacturing machine before the production, ensure the accuracy nature of system, guarantee that film thickness deviation control is at 2um, clearance die head and spirochaeta before the production simultaneously, can paint with paraffin or methyl silicone oil during the clearance, then wipe the thickener with 1000 mesh abrasive paper gently until clean, guarantee that the die head clearance is stable. The PE film needs corona treatment to be compounded because the molecules are nonpolar. The principle of corona treatment is that high frequency and high voltage are utilized to carry out corona discharge (high frequency alternating current voltage reaches 5000-15000V/m2) on the surface of a treated film to generate low temperature plasma, so that radical reaction is generated on the surface of the film to crosslink polymers. The surface becomes rough and increases its wettability to polar solvents-these plasma from electric shock and penetration into the surface of the body to be printed destroys its molecular structure, which in turn oxidizes and polarizes the surface molecules being treated, the ionic shock attacks the surface, so that the adhesion capacity of the film-bearing surface is increased. The PE surface tension value of the novel corona treatment agent is required to be more than 40dyn (generally more than 38 dyn), so that the corona treatment adopts double corona treatment, and the power is 7.5 kw. The winding mode adopts a line taper decreasing mode. A KURABO sizing amount monitoring system was used.
The invention also provides a self-standing bag capable of being torn and opened linearly, and the bag making process comprises the following steps:
the main process comprises the following steps: feeding, lower knife film separation, bottom adding, bottom transverse sealing, longitudinal sealing, handle hole punching, bag cutting by a cutter, bag collection and boxing.
The parameters for hand tearing open the stand-up pouch are as follows table 4:
table 4
Figure BDA0002571184770000121
The test method of the tearing property of the attached line comprises the following steps:
a method for testing straight line tear was designed as follows:
1. taking a strip sample composite film with the width of 50mm and the length of 300mm, cutting one end of the strip sample composite film into 2 notches, and cutting the composite film into three parts, as shown in the following figure 3;
2. the two sheets at the two sides and the end part of one sheet in the middle are pulled reversely by a testing machine to be separated from the middle sheet, the pulling speed simulates the unsealing speed of people and is generally set to be 1000+50mm/min, and the chart is shown as the following figure 4;
3. the test piece film which was torn apart was measured, and if it was divided into three rectangles, the straight-line tearing effect of the film was the best. If the tear is gradually thinned in the middle, the width of the strip is measured at 50mm from the starting tear, and this width is used as an indicator of "straight tear". As shown in fig. 5 below.
The above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its aspects.

Claims (6)

1. The self-supporting bag packaging material capable of being torn and opened linearly is characterized by being a composite film, wherein the composite film comprises a BOPP film layer (1), an ink layer (2), an aluminum foil layer (3) and a PE layer (4) which are sequentially attached, and the PE layer (4) comprises a corona layer, a middle layer and a heat sealing layer;
the corona layer comprises 66.3 wt% of 7042 linear low density polyethylene with the mark of Chinese petrochemical Yangzi, 33.3 wt% of 150BW low density polyethylene with the mark of Exxon and 0.4 wt% of fluorine processing aid with the mark of Anxuan 100991-K;
the middle layer comprises 50.0 wt% of linear low-density polyethylene with the trade name of 7042 medium petrochemical raisin, 40.0 wt% of high-density polyethylene with the trade name of 40.0 Thailand petrochemical HD3355F and 10.0 wt% of polybutene with the trade name of Dutch Barsell PB 0110;
the heat sealing layer comprises 53.9 wt% of SP0540 metallocene linear low-density polyethylene of Mitsui Japan, 43.0 wt% of high-density polyethylene of Thailand petrochemical HD3355F, 1.6 wt% of opening master batch of Beijing Asian AB-20LD and 1.5 wt% of slipping agent of ESQ-4 of Mitsui Japan.
2. The packaging material of the self-standing bag capable of being torn and opened linearly according to claim 1, wherein the thicknesses of the BOPP film layer (1), the ink layer (2), the aluminum foil layer (3) and the PE layer (4) are 20um, 1um, 9um and 50um in sequence; the thickness ratio of the corona layer to the intermediate layer to the heat-sealing layer is 2: 5: 3; the BOPP film layer (1) is the brand SF-01 produced by Hongkong Senfu.
3. A process for preparing a packaging material for a self-standing pouch which can be opened by straight tearing according to any one of claims 1 to 2, comprising the steps of:
s1, printing process: printing a layer of printing ink on the surface of the BOPP film at the printing speed of 150-250m/min, and drying and curing the printing ink at the temperature of 40-60 ℃ to form a printing ink layer (2);
s2, film blowing process: respectively weighing the components in parts by weight according to the formula composition of a corona layer, an intermediate layer and a heat-sealing layer in the PE blown film, and then adopting a three-layer co-extrusion blown film process to prepare a PE layer (4);
s3, primary compounding: carrying out dry compounding on the BOPP film layer (1) with the ink layer (2) and the aluminum foil layer (3) under the action of compound glue to form a primary composite structure;
s4, secondary compounding: and (3) carrying out dry compounding on the primary composite structure and the PE layer (4) under the action of the composite glue to form a composite film.
4. The process for preparing a self-standing bag packaging material capable of being torn and opened linearly as claimed in claim 3, wherein the dry-type compound adopts a compound glue brand of Rohm and Haas 811A/COREACTANTF two-component glue, the glue comprises Rohm and Haas 811A, COREACTANTF and ethyl ester, and the mass ratio of Rohm and Haas 811A, COREACTANTF to ethyl ester is 10:1.2: 9.
5. A process for preparing a straight tear openable self-standing bag packaging material as claimed in claim 3, wherein the process parameters of the first compounding are controlled as follows: the speed of the vehicle is 120 +/-10 m/min, the first releasing tension is 80 +/-20N, the leading-out tension is 40 +/-20N, the second releasing tension is 160 +/-40N, the tension of the drying tunnel is 20 +/-10N, and the winding tension is 200 plus 280N, wherein the winding mode adopts a linear taper decreasing mode.
6. A process for preparing a straight tear openable self-standing bag packaging material as claimed in claim 3, wherein the process parameters of the secondary compounding are controlled as follows: the speed of the vehicle is 130 +/-20 m/min, the first release tension is 60 +/-20N, the leading-out tension is 100 +/-20N, the second release tension is 50 +/-10N, the drying tunnel tension is 100 +/-20N, and the winding tension is 100 plus 180N, wherein the winding mode adopts a linear taper decreasing mode.
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