CN115972724A - Four-way easy-tear packaging bag and preparation method thereof - Google Patents
Four-way easy-tear packaging bag and preparation method thereof Download PDFInfo
- Publication number
- CN115972724A CN115972724A CN202211712095.0A CN202211712095A CN115972724A CN 115972724 A CN115972724 A CN 115972724A CN 202211712095 A CN202211712095 A CN 202211712095A CN 115972724 A CN115972724 A CN 115972724A
- Authority
- CN
- China
- Prior art keywords
- film
- layer
- packaging bag
- composite
- tear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims description 17
- 239000010410 layer Substances 0.000 claims abstract description 95
- 239000002131 composite material Substances 0.000 claims abstract description 63
- 239000004698 Polyethylene Substances 0.000 claims abstract description 44
- -1 polyethylene Polymers 0.000 claims abstract description 37
- 229920006267 polyester film Polymers 0.000 claims abstract description 33
- 229920000573 polyethylene Polymers 0.000 claims abstract description 33
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000007639 printing Methods 0.000 claims abstract description 28
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 25
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 25
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 25
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011888 foil Substances 0.000 claims abstract description 23
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 18
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 238000001125 extrusion Methods 0.000 claims abstract description 12
- 238000010096 film blowing Methods 0.000 claims abstract description 10
- 239000004743 Polypropylene Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 40
- 238000013329 compounding Methods 0.000 claims description 17
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 11
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000007646 gravure printing Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000001815 facial effect Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 abstract description 4
- 229920001155 polypropylene Polymers 0.000 abstract description 4
- 239000005022 packaging material Substances 0.000 abstract description 3
- 230000002457 bidirectional effect Effects 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012856 packing Methods 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- 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
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
The invention discloses a four-way easy-tear packaging bag which comprises a packaging bag front side and a packaging bag back side, wherein a printing film, an aluminum foil, a polyester film and a polyethylene film are sequentially arranged on the packaging bag front side/the packaging bag back side from outside to inside; the printing film is a bidirectional stretching polypropylene film or the polyester film is a bidirectional stretching polyester film; the polyethylene film comprises a composite layer, an intermediate layer and a heat sealing layer from outside to inside in sequence, and is obtained by co-extrusion film blowing; wherein, the raw materials of the composite layer and the middle layer are both composed of LDPE and LLDPE, and the weight ratio of the LDPE and the LLDPE in the composite layer and the middle layer is 1-3:1; the raw material of the heat-sealing layer consists of LDPE and mPE, and the weight ratio of the LDPE to the mPE of the heat-sealing layer is 0.5-2:1. the packaging bag is easy to tear, can ensure that the packaging bag is torn into a straight line, can ensure the barrier property within the quality guarantee period, and does not have the problem of broken packaging materials when packaging some products with sharp corners.
Description
Technical Field
The invention relates to the technical field of packaging materials of packaging bags, in particular to a four-way easy-tear packaging bag and a preparation method thereof.
Background
Along with the improvement of people's standard of living, also constantly improving to the requirement of packing, also proposed higher requirement to the easy tearing nature of material, the soft-packing product easy tearing nature on the existing market mainly relies on: (1) The problem of tearing the easy-to-tear opening is solved, but the easy-to-tear effect is not ideal, and the easy-to-tear opening has an unsatisfactory opening effect even if the easy-to-tear opening is formed in a candy package or a milk powder package; (2) The base material with high mechanical strength is damaged by a mechanical method or a laser method at a fixed position to form densely distributed mechanical holes or easy-to-tear lines, so that the easy-to-tear effect is achieved; (3) The surface of the film material is subjected to overall physical damage through a physical mode on the surface substrate, so that the mechanical property is reduced, and the effect of easy tearing is achieved. The tearing of the tearing opening into the inclined shape has great influence on the field of cosmetics, and if the tearing opening which is not in a straight line usually has liquid leakage, the experience feeling is influenced; if the overlong tearing opening can cause that after one part is torn, the other part does not reach the opening, so that the experience is influenced by repeatedly tearing and opening. Therefore, the packaging bag packaging material adopting the technical scheme has the following defects:
the easy-tearing opening is formed by adopting the scheme (1), so that an easy-tearing trigger point can be formed on a hot sealing edge of the bag, but the problem that a film is easy to tear cannot be solved, and the tearing line cannot be guaranteed;
the scheme (2) has the problem that the surface of the base material is damaged due to the fact that mechanical or laser process parameters are stable, so that the barrier property of the product is reduced, and the product is required to be used with caution in products with quality guarantee period requirements.
Adopt (3) scheme then to make the whole mechanical properties of membrane material descend, then have the damaged problem of package material when packing some products that have the sharp angle, moreover, the package material of producing with this type of mode is improved to some extent in easy tearing nature, can't guarantee to tear into the straight line (tear line orientation relatively poor promptly).
Disclosure of Invention
In view of the defects, the invention provides the four-way easy-tear packaging bag and the preparation method thereof.
In order to achieve the aim, the invention provides a four-way easy-tear packaging bag which comprises a packaging bag front side and a packaging bag back side and is characterized in that a printing film, an aluminum foil, a polyester film and a polyethylene film are sequentially arranged on the packaging bag front side/the packaging bag back side from outside to inside; the printing film is a biaxially oriented polypropylene film or the polyester film is a biaxially oriented polyester film; the polyethylene film comprises a composite layer, an intermediate layer and a heat sealing layer from outside to inside in sequence, and is obtained by co-extruding and film blowing of the composite layer, the intermediate layer and the heat sealing layer; the composite layer and the middle layer are both made of LDPE and LLDPE, and the weight ratio of the LDPE to the LLDPE in the composite layer to the middle layer is 1-3:1; the raw materials of the heat-sealing layer are composed of LDPE and mPE, and the weight ratio of the LDPE to the mPE in the heat-sealing layer is 0.5-2:1.
according to one aspect of the invention, the thickness of the printing film is 15-28um, and the specific preparation process is as follows: taking PP as a raw material, preparing a thick sheet by adopting an extrusion method, and preparing the printing film by biaxial stretching; wherein, the printing film is also gravure printed with image-text printing ink.
According to one aspect of the invention, the thickness of the aluminum foil is 6-10um, and the specific preparation process comprises the following steps: the aluminum foil is obtained by directly rolling a metal aluminum sheet and then fully annealing and softening the metal aluminum sheet.
According to one aspect of the invention, the thickness of the polyester film is 12-25um, and the specific preparation process comprises the following steps: PET is used as a raw material, a thick sheet is prepared by adopting an extrusion method, and the polyester film is prepared by biaxial stretching.
According to one aspect of the present invention, the polyethylene film has a thickness of 50-100um, and is prepared by the following steps:
mixing the raw materials according to respective formulas of the composite layer, the intermediate layer and the heat sealing layer to respectively obtain a composite layer mixed material, an intermediate layer mixed material and a heat sealing layer mixed material;
respectively adding the composite layer mixed material, the middle layer mixed material and the heat sealing layer mixed material into three hoppers in corresponding extruder parts in a film blowing machine, and carrying out three-layer co-extrusion film blowing treatment, wherein the temperature of the extruder is 150-185 ℃, so as to obtain a film;
and cooling and rolling the film to obtain the polyethylene film.
According to one aspect of the invention, the printed film, the aluminum foil, the polyester film and the polyethylene film are connected through a two-component adhesive; the thickness of each bi-component adhesive among the printing film, the aluminum foil, the polyester film and the polyethylene film is 3-6um.
According to one aspect of the invention, the thickness ratio of the composite layer, the intermediate layer and the heat seal layer is 2:3:2.
based on the same invention concept, the invention also provides a preparation method of any one of the four-way easy-to-tear packaging bags, wherein the packaging bag is a facial mask bag, and the method comprises the following steps:
step 1: after gravure printing of graphic and text ink on one surface of the printing film, compounding the printing film subjected to gravure printing of the graphic and text ink with an aluminum foil through a compound machine to obtain a composite film L1;
step 2: placing the composite film L1 in a constant temperature environment of 50-60 ℃ for curing for 12-24h, and compounding the cured composite film L1 with the polyester film through a compounding machine to obtain a composite film L2;
and step 3: placing the composite film L2 in a constant temperature environment of 40-50 ℃ for curing for 36-48h, and then compounding the cured composite film L2 with the polyethylene film through a compounding machine to obtain a composite film L3;
and 4, step 4: placing the composite membrane L3 in a constant temperature environment of 40-50 ℃ for curing for 72-96h, cooling to room temperature, and cutting into composite membranes L3-1 with required width by a splitting machine;
and 5: and (3) transversely discharging the 2 composite films L3-1 into a bag by a bag making machine, melting and pressing the polyethylene film of the inner layer, and performing die cutting on the bag shape and the bag edge easy-to-tear opening to mold and form by a die cutting process to obtain the facial mask bag.
In accordance with one aspect of the present invention, the temperature of the melt pressing of the polyethylene film in the step 5 is 160 to 200 ℃.
In step 5, the bag machine is further provided with a specially shaped three-edge sealing mold.
The invention has the beneficial effects that: the four-way easy-tear packaging bag provided by the invention has larger orientation in both the longitudinal direction (MD) and the Transverse Direction (TD) because the surface layer is a biaxially oriented polypropylene film or the secondary inner layer is a biaxially oriented polyester film. The random copolymerized polypropylene has the characteristics of high rigidity, high strength and stable size, so that the random copolymerized polypropylene is not easy to stretch and deform when being subjected to external shearing; the biaxially oriented polyester film is quenched after being heated and formed by an extrusion method, and then is stretched and reheated to keep the rigidity, hardness, impact strength and dimensional stability of the biaxially oriented polyester film, so that the biaxially oriented polyester film is not easy to stretch and deform when being sheared. The aluminium foil is a thin metal foil with little stretchability and will break almost instantaneously when subjected to shear forces. The polyethylene film is formed by blowing, and is considered to be a single orientation material with orientation in the MD direction in the process of blowing, and the formula comprises the following steps: the LLDPE and the LDPE are co-extruded to obtain good processability, puncture resistance strength and toughness, which are the main purposes of matching the composite layer and the middle layer PE, and the heat sealing layer adopts the mPE and the LDPE for co-extrusion so as to ensure that the PE has good pollution resistance and lower seal-off temperature. When the materials are compounded, because the bag making mode is a transverse bag making mode, namely the tearing direction is consistent with the film material direction and is MD, the materials can be torn along the shearing direction under the action of the tearing opening, and the materials are not obviously stretched and influenced by transverse complex branched chains, so that an easily torn straight line is formed without obvious stretching. The strong barrier properties of the aluminum foil provide assurance that the OTR/WVTR is <0.1. There is no package breakage problem when packaging some products with sharp corners-the inner LLDPE provides good puncture resistance and the second inner PET has good impact strength.
Drawings
Fig. 1 is a schematic structural view of the front/back of the four-way easy-tear package according to an embodiment of the present invention.
Description of the drawings: 1. printing a film; 2. aluminum foil; 3. a polyester film; 4. a polyethylene film.
Detailed Description
In order that the invention may be more readily understood, reference will now be made to the following examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention, and it should be understood that the described examples are only a portion of the examples of the present invention, rather than the entire scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. Unless otherwise defined, the terms used hereinafter are consistent with the meaning understood by those skilled in the art; unless otherwise specified, the starting materials and reagents referred to herein may be purchased from commercial sources or prepared by known methods.
It should be noted that the polypropylene of the present application is abbreviated as PP; the biaxially oriented polypropylene comprises extinction biaxially oriented polypropylene or bright biaxially oriented polypropylene, wherein the extinction biaxially oriented polypropylene is called TOPP for short, and the bright biaxially oriented polypropylene is called BOPP for short; the polyester is abbreviated as PET; the polyethylene is abbreviated as PE, wherein LDPE represents low-density polyethylene, LLDPE represents linear low-density polyethylene, and mPE represents metallocene polyethylene respectively; INK herein refers to an INK, and the INK herein is a polyurethane INK, and specifically includes a polyurethane resin binder, a polyurethane resin pigment, and a polyurethane resin primer.
It should be noted that the numbers following the materials in the material structures in the examples and comparative examples of the present application indicate the thickness (um) of the corresponding material layer, such as: TOPP18 indicates a matte biaxially oriented polypropylene layer thickness of 18um.
The invention provides a four-way easy-tear packaging bag which comprises a packaging bag front side and a packaging bag back side, wherein the packaging bag front side/the packaging bag back side are sequentially provided with a printing film 1, an aluminum foil 2, a polyester film 3 and a polyethylene film 4 from outside to inside; the printing film 2 is a biaxially oriented polypropylene film or the polyester film 3 is a biaxially oriented polyester film; the polyethylene film 4 comprises a composite layer, an intermediate layer and a heat sealing layer from outside to inside in sequence, and the polyethylene film 4 is obtained by co-extruding and film blowing of the composite layer, the intermediate layer and the heat sealing layer; the composite layer and the middle layer are both made of LDPE and LLDPE, and the weight ratio of the LDPE to the LLDPE in the composite layer to the middle layer is 1-3:1; the raw materials of the heat-sealing layer are composed of LDPE and mPE, and the weight ratio of the LDPE to the mPE in the heat-sealing layer is 0.5-2:1.
in some embodiments of the present application, the thickness of the printing film 1 is 15-28um, and the specific preparation process is: taking PP as a raw material, preparing a thick sheet by adopting an extrusion method, and preparing the printing film by biaxial stretching; the printed film is excellent in tensile strength and impact strength and high in stiffness. Wherein, the printing film is also gravure printed with image-text printing ink.
In some embodiments of the present application, the thickness of the aluminum foil 2 is 6-10um, and the specific preparation process is as follows: the aluminum foil is obtained by directly rolling a metal aluminum sheet and then fully annealing and softening the metal aluminum sheet. The aluminum foil is soft, has good barrier property, anti-illumination property, high temperature resistance and low temperature resistance, is high in hardness, small in tearing strength, high in tensile strength, good in composite property and easy to tear.
In some embodiments of the present application, the thickness of the polyester film 3 is 12 to 25um, and the specific preparation process is: PET is used as a raw material, a thick sheet is prepared by adopting an extrusion method, and the polyester film is prepared by biaxial stretching. The polyester film is colorless, transparent and glossy, has excellent mechanical property, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature resistance, low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention.
In some embodiments of the present application, the thickness of the polyethylene film 4 is 50-100um, and the specific preparation process comprises the following steps:
mixing the raw materials according to respective formulas of the composite layer, the intermediate layer and the heat sealing layer to respectively obtain a composite layer mixed material, an intermediate layer mixed material and a heat sealing layer mixed material;
respectively adding the composite layer mixed material, the middle layer mixed material and the heat sealing layer mixed material into three hoppers in corresponding extruder parts in a film blowing machine, and carrying out three-layer co-extrusion film blowing treatment, wherein the temperature of the extruder is 150-185 ℃, so as to obtain a film;
and cooling and rolling the film to obtain the polyethylene film.
In some embodiments of the present application, the printed film, the aluminum foil, the polyester film and the polyethylene film are connected by a two-component adhesive; the thickness of each bi-component adhesive among the printing film, the aluminum foil, the polyester film and the polyethylene film is 3-6um.
The two-component adhesive is illustratively a polyurethane-based compound adhesive.
In some embodiments of the present application, the thickness ratio of the composite layer, the intermediate layer and the heat seal layer is 2:3:2.
the invention also provides a preparation method of any one of the four-way easy-tear packaging bags, wherein the packaging bag is a facial mask bag and comprises the following steps:
step 1: after gravure printing of image-text ink on one surface of the printing film, compounding the printing film with the gravure printing of the image-text ink and an aluminum foil through a compounding machine to obtain a composite film L1;
step 2: placing the composite film L1 in a constant temperature environment of 50-60 ℃ for curing for 12-24h, and then compounding the cured composite film L1 with the polyester film through a compounding machine to obtain a composite film L2;
and step 3: placing the composite film L2 in a constant temperature environment of 40-50 ℃ for curing for 36-48h, and then compounding the cured composite film L2 with the polyethylene film through a compounding machine to obtain a composite film L3;
and 4, step 4: the composite membrane L3 is placed in a constant temperature environment of 40-50 ℃ for curing for 72-96h, and is cut into composite membranes L3-1 with required width by a splitting machine after being cooled to room temperature;
it should be noted that, as the number of layers of the composite film increases, the curing temperature decreases and the curing time increases, because with the introduction of the PE layer, too high a curing temperature may cause the stretching variables between different layers of the film to be inconsistent and cause warping.
And 5: and (3) transversely discharging the 2 composite films L3-1 by a bag making machine to make a bag, melting and pressing the polyethylene film on the inner layer, and performing die cutting on the bag shape and the bag edge easy-to-tear opening to mold and form through a die cutting process to obtain the packaging bag.
In some embodiments of the present application, the temperature of the melt pressing of the polyethylene film in the step 5 is 160 to 200 ℃.
In some embodiments of the present application, the bag machine is further provided with a specially shaped tri-edge sealing mold in step 5.
Example 1
The material structure is as follows: TOPP18/INK/AL7/PET12/PE70
The PE comprises the following components: compound layer: an intermediate layer: heat seal layer thickness ratio =2:3:2; LLDPE =2 in the composite layers and the intermediate layers; mPE =1 for LDPE in the heat seal layer.
Example 2
The material structure is as follows: TOPP18/INK/AL7/PET12/PE70
The PE comprises the following components: compound layer: an intermediate layer: heat seal layer thickness ratio =2:3:2; LLDPE =3 in the composite layers and the intermediate layers; mPE =1 for LDPE in the heat seal layer.
Example 3
The material structure is as follows: TOPP18/INK/AL7/PET12/PE70
The PE comprises the following components: compound layer: an intermediate layer: heat seal layer thickness ratio =2:3:2; LLDPE = 2; mPE = 3.
Example 4
The material structure is as follows: TOPP18/INK/AL7/PET12/PE70
The PE comprises the following components: compound layer: intermediate layer: heat seal layer thickness ratio =2:3:2; LLDPE =5 in the composite layers and the intermediate layers; mPE = 2.
Example 5
The material structure is as follows: TOPP18/INK/AL7/PET12/PE70
The PE comprises the following components: compound layer: an intermediate layer: heat seal layer thickness ratio =2:3:2; LLDPE = 3; mPE =2 as LDPE in the heat seal layer.
Comparative example 1
The material structure is as follows: TOPP18/INK/AL7/PET12/PE70
The PE comprises the following components: a single layer; LDPE LLDPE mPE = 1.
Comparative example 2
The material structure is as follows: TOPP18/INK/AL7/PET12/PE70
The PE comprises the following components: a single layer; LDPE: mPE = 1.
Performance detection
The packages prepared in examples 1 to 5 and comparative examples 1 to 2 were subjected to the relevant tests, and the test results are shown in the following table:
the direction 1 is specifically: the packaging bag is torn from the direction of the easy-to-tear opening on the left side on the front side, and is torn to the right side at a constant speed of 30mm/s with transverse force; the direction 2 is specifically: the packaging bag is torn from the direction of the easy-to-tear opening on the right side and is torn to the left side at a constant speed of 30mm/s by transverse force. The direction 3 is specifically: the back of the packaging bag is torn from the direction of the easy-to-tear opening on the left side, and is torn to the right side with transverse force at a constant speed of 30 mm/s; direction 4 specifically is: the back of the packaging bag is torn from the direction of the easy-to-tear opening on the right side, and the packaging bag is torn to the left side with transverse force at a constant speed of 30 mm/s.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A four-way easy-tear packaging bag comprises a packaging bag front side and a packaging bag back side, and is characterized in that a printing film, an aluminum foil, a polyester film and a polyethylene film are sequentially arranged on the packaging bag front side/the packaging bag back side from outside to inside; the printing film is a biaxially oriented polypropylene film or the polyester film is a biaxially oriented polyester film; the polyethylene film comprises a composite layer, an intermediate layer and a heat sealing layer from outside to inside in sequence, and is obtained by co-extruding and film blowing of the composite layer, the intermediate layer and the heat sealing layer; the composite layer and the middle layer are both made of LDPE and LLDPE, and the weight ratio of the LDPE to the LLDPE in the composite layer to the middle layer is 1-3:1; the raw materials of the heat-sealing layer are composed of LDPE and mPE, and the weight ratio of the LDPE to the mPE in the heat-sealing layer is 0.5-2:1.
2. the four-way easy-tear packaging bag according to claim 1, wherein the thickness of the printed film is 15-28um, and the specific preparation process comprises: taking PP as a raw material, preparing a thick sheet by adopting an extrusion method, and preparing the printing film by biaxial stretching; wherein, the printing film is also gravure printed with graphic ink.
3. The four-way easy-tear packaging bag according to claim 1, wherein the aluminum foil has a thickness of 6-10um, and the specific preparation process comprises: the aluminum foil is obtained by directly rolling a metal aluminum sheet and then fully annealing and softening the metal aluminum sheet.
4. The four-way easy-tear packaging bag according to claim 1, wherein the thickness of the polyester film is 12-25um, and the specific preparation process comprises: PET is used as a raw material, a thick sheet is prepared by adopting an extrusion method, and the polyester film is prepared by biaxial stretching.
5. The four-way easy-tear packaging bag according to claim 1, wherein the thickness of the polyethylene film is 50-100um, and the specific preparation process comprises the following steps:
mixing the raw materials according to respective formulas of the composite layer, the intermediate layer and the heat sealing layer to respectively obtain a composite layer mixed material, an intermediate layer mixed material and a heat sealing layer mixed material;
respectively adding the composite layer mixed material, the middle layer mixed material and the heat sealing layer mixed material into three hoppers in corresponding extruder parts in a film blowing machine, and carrying out three-layer co-extrusion film blowing treatment, wherein the temperature of the extruder is 150-185 ℃, so as to obtain a film;
and cooling and rolling the film to obtain the polyethylene film.
6. The four-way easy-tear package bag of claim 1, wherein the printed film, the aluminum foil, the polyester film and the polyethylene film are connected by a two-component adhesive; the thickness of each bi-component adhesive among the printing film, the aluminum foil, the polyester film and the polyethylene film is 3-6um.
7. The four-way easy-tear package bag of claim 1, wherein the thickness ratio of the composite layer, the intermediate layer and the heat seal layer is 2:3:2.
8. the method for preparing a four-way easy-tear packaging bag according to any one of claims 1 to 7, wherein the packaging bag is a facial mask bag, and the method comprises the following steps:
step 1: after gravure printing of image-text ink on one surface of the printing film, compounding the printing film with the gravure printing of the image-text ink and an aluminum foil through a compounding machine to obtain a composite film L1;
step 2: placing the composite film L1 in a constant temperature environment of 50-60 ℃ for curing for 12-24h, and then compounding the cured composite film L1 with the polyester film through a compounding machine to obtain a composite film L2;
and step 3: placing the composite film L2 in a constant temperature environment of 40-50 ℃ for curing for 36-48h, and compounding the cured composite film L2 with the polyethylene film through a compounding machine to obtain a composite film L3;
and 4, step 4: the composite membrane L3 is placed in a constant temperature environment of 40-50 ℃ for curing for 72-96h, and is cut into composite membranes L3-1 with required width by a splitting machine after being cooled to room temperature;
and 5: and (3) transversely discharging the 2 composite films L3-1 into a bag by a bag making machine, melting and pressing the polyethylene film of the inner layer, and performing die cutting on the bag shape and the bag edge easy-to-tear opening to mold and form by a die cutting process to obtain the facial mask bag.
9. The method for preparing a four-way easy-tear package bag according to claim 8, wherein the melt-pressing temperature of the polyethylene film in the step 5 is 160-200 ℃.
10. The method for preparing a four-way easy-tear packaging bag according to claim 8, wherein in the step 5, the bag making machine is further provided with a three-edge sealing die with a specific shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211712095.0A CN115972724A (en) | 2022-12-29 | 2022-12-29 | Four-way easy-tear packaging bag and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211712095.0A CN115972724A (en) | 2022-12-29 | 2022-12-29 | Four-way easy-tear packaging bag and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115972724A true CN115972724A (en) | 2023-04-18 |
Family
ID=85962249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211712095.0A Pending CN115972724A (en) | 2022-12-29 | 2022-12-29 | Four-way easy-tear packaging bag and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115972724A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103029386A (en) * | 2012-12-27 | 2013-04-10 | 中国人民解放军总装备部军械技术研究所 | Military puncture-proof, tear-resistant, anti-static and high-barrier camouflage painting composite and preparation method thereof |
| CN103192564A (en) * | 2013-04-15 | 2013-07-10 | 黄山永新股份有限公司 | Shredded composite packaging film in arbitrary direction and preparation method thereof |
| CN104191766A (en) * | 2014-09-03 | 2014-12-10 | 黄山永新股份有限公司 | Polyethylene film, packaging composite film and preparation method thereof |
| CN109398910A (en) * | 2018-09-27 | 2019-03-01 | 广州品赫生物科技有限公司 | Facial mask bag material, production technology and mask packaging bag |
| CN111267447A (en) * | 2020-03-09 | 2020-06-12 | 黄山永新股份有限公司 | Cast polyethylene film, composite film thereof and preparation method of composite film |
-
2022
- 2022-12-29 CN CN202211712095.0A patent/CN115972724A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103029386A (en) * | 2012-12-27 | 2013-04-10 | 中国人民解放军总装备部军械技术研究所 | Military puncture-proof, tear-resistant, anti-static and high-barrier camouflage painting composite and preparation method thereof |
| CN103192564A (en) * | 2013-04-15 | 2013-07-10 | 黄山永新股份有限公司 | Shredded composite packaging film in arbitrary direction and preparation method thereof |
| CN104191766A (en) * | 2014-09-03 | 2014-12-10 | 黄山永新股份有限公司 | Polyethylene film, packaging composite film and preparation method thereof |
| CN109398910A (en) * | 2018-09-27 | 2019-03-01 | 广州品赫生物科技有限公司 | Facial mask bag material, production technology and mask packaging bag |
| CN111267447A (en) * | 2020-03-09 | 2020-06-12 | 黄山永新股份有限公司 | Cast polyethylene film, composite film thereof and preparation method of composite film |
Non-Patent Citations (1)
| Title |
|---|
| 赵世亮;: "复合膜卷曲现象的产生原因及解决办法", 印刷技术, no. 11, 15 November 2019 (2019-11-15), pages 28 - 30 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2406313B1 (en) | Machine direction oriented film for labels | |
| US10005262B2 (en) | Heat shrinkable polyolefin film and a preparation method thereof | |
| CA2803285C (en) | Heat sealable film with linear tear properties | |
| JP5579394B2 (en) | In-mold label | |
| EP2116354B1 (en) | Heat shrinkable polyolefin film and process for producing the same | |
| EP3192654B1 (en) | Polyethylene sealant film having high strength and package using the same | |
| MXPA02005888A (en) | Polypropylene based compositions and films and labels formed therefrom. | |
| US9669591B2 (en) | Heat sealable film with linear tear properties | |
| CN108724878B (en) | Polypropylene sealant film for press molding | |
| CA2394771A1 (en) | Multilayer film structures having improved seal and tear properties | |
| JP5820562B2 (en) | Cover material for press-through pack and packaging | |
| CN110696461B (en) | High-heat-seal-strength puncture-resistant BOPP film and preparation method thereof | |
| US20130095338A1 (en) | Soft Multi-Layer Shrink Films | |
| US20210339925A1 (en) | High-barrier recyclable film | |
| EP3862181A1 (en) | Polyethylene film | |
| JP4670477B2 (en) | Laminated polyolefin foam film | |
| WO2021200593A1 (en) | Polyolefin-based resin film, and laminate using same | |
| CN115972724A (en) | Four-way easy-tear packaging bag and preparation method thereof | |
| WO2013099698A1 (en) | Easy-to-tear laminated film and easy-to-tear packaging bag | |
| JP5380830B2 (en) | Heat-shrinkable polyolefin film and method for producing the same | |
| CN116018269A (en) | Laminate and self-standing pouch | |
| JP2018090723A (en) | Polypropylene-based sealant film and method for producing the same | |
| JP2011240619A (en) | Styrene heat-shrinkable film for over-wrap packing | |
| CN110997304A (en) | Polymer film for in-mold labeling | |
| WO2022191248A1 (en) | Container with label |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |