CN111497354B - Liquid food packaging film and processing technology thereof - Google Patents

Liquid food packaging film and processing technology thereof Download PDF

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Publication number
CN111497354B
CN111497354B CN202010317588.9A CN202010317588A CN111497354B CN 111497354 B CN111497354 B CN 111497354B CN 202010317588 A CN202010317588 A CN 202010317588A CN 111497354 B CN111497354 B CN 111497354B
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layer
aluminum plate
packaging film
food packaging
liquid food
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CN111497354A (en
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余文俊
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Shanghai Tangke New Material Technology Co ltd
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Shanghai Tangke New Material Technology 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
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • 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
    • B32B27/06—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
    • B32B27/10—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 paper or cardboard
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • 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
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Cartons (AREA)

Abstract

The invention relates to a liquid food packaging film and a processing technology thereof, relating to the technical field of food packaging films, comprising an outer sealing layer, a barrier layer and an inner sealing layer which are sequentially formed into an integral structure, wherein the bonding layer is connected between the outer sealing layer and the barrier layer in a forming way, the inner sealing layer comprises an adhesion layer and an inner surface layer which are formed into an integral structure in advance, and the adhesion layer is connected with the barrier layer in a forming way. Because the inner sealing layer is a pre-formed integrated structure, and the integrated structure is reused for subsequent forming operation, compared with the traditional production mode of blowing, spraying and heating forming layer by layer, the number of links of production and processing of the liquid packaging film and corresponding forming production equipment are reduced, and the purpose of reducing the production cost of the liquid food packaging film is further achieved.

Description

Liquid food packaging film and processing technology thereof
Technical Field
The invention relates to the technical field of food packaging films, in particular to a liquid food packaging film and a processing technology thereof.
Background
PVDC coating films, also known as PVDC coating films, abbreviated as K films, are often used as barrier packaging materials to prepare composite packaging bags. According to different types of the K film, the packaging film can be used for packaging different products, and the application range of the packaging film comprises the packaging of meat products and aquatic products, the packaging of dried fruits and seasonings, the packaging of cake foods, the packaging of liquid foods and the like.
The prior application publication No. CN103448335A discloses a co-extruded heat shrinkable film, which comprises a heat sealing layer, a barrier layer and an outer surface layer, wherein the adjacent layers are fixed by using an adhesive; the heat sealing layer is made of ethylene-acrylic acid copolymer, the barrier layer is made of one of polyethylene terephthalate or polyethylene naphthalate, the outer surface layer is made of metallocene polyethylene, the binder is PE-g-MAH, and the heat sealing layer has good barrier property and high tensile strength.
In the above application, the production process of the thin film is completed by a layer-by-layer heating and forming production process; in the packaging of milk and other liquids, a similar multilayer film structure and multilayer film production process can be adopted to finish production and processing, but the production and processing mode of layer-by-layer heating and forming needs more process links and corresponding forming equipment, so that the production cost of the film is higher, and the prior art has the improvement.
Disclosure of Invention
In view of the defects in the prior art, an object of the present invention is to provide a liquid food packaging film, which integrally forms an inner sealing layer in advance, and then forms the inner sealing layer, a barrier layer and an outer sealing layer to form an integrated structure, so as to achieve the purpose of reducing processing links and forming equipment, and further achieve the purpose of reducing the production cost of the liquid food packaging film.
The above object of the present invention is achieved by the following technical solutions: the utility model provides a liquid food packaging film, is including outer seal, barrier layer and the interior seal that the shaping constitutes a body structure in proper order, outer seal is connected with the adhesive linkage with the intermediate shaping of barrier layer, just interior seal is including adhesion layer and the endosexine that the shaping constitutes a body structure in advance, the adhesion layer is connected with the barrier layer shaping.
By adopting the technical scheme, the adhesion layer and the inner surface layer are formed in advance during processing production so as to prepare the inner sealing layer, then the outer sealing layer and the blocking layer are formed, and finally the integral structure formed by the outer sealing layer and the blocking layer and the inner sealing layer are formed so as to prepare the liquid food packaging film. Because the inner sealing layer is a pre-formed integrated structure, subsequent forming operation is carried out by utilizing the integrated structure, and compared with the traditional production mode of blowing, spraying and heating forming layer by layer, the number of links of production and processing of the liquid packaging film and corresponding forming production equipment are reduced, and the aim of reducing the production cost of the liquid food packaging film is further fulfilled.
The present invention in a preferred example may be further configured to: the barrier layer and the inner surface layer are matched to form a double-layer barrier structure, and the barrier layer and the inner surface layer are made of metallocene polyethylene.
By adopting the technical scheme, the metallocene polyethylene has a lower melting point and an obvious melting zone, is obviously superior to the traditional polyethylene material in the aspects of toughness, transparency, hot adhesiveness and barrier property, is used as the barrier layer of the liquid food packaging film, and has good barrier property; meanwhile, the double-layer blocking structure formed by the blocking layer and the inner surface layer of the inner sealing layer has a better blocking effect and can play a role in double insurance.
The invention in a preferred example may be further configured to: the materials of the bonding layer and the adhesion layer are both ethylene acrylic acid copolymer.
By adopting the technical scheme, the ethylene acrylic acid copolymer has thermoplasticity, higher adhesiveness, lower melting point and softening point, and can improve the bonding forming strength between adjacent layers and the convenience of bonding forming operation when bonding forming the inner sealing layer, the barrier layer and the outer sealing layer.
The present invention in a preferred example may be further configured to: the outer sealing layer is of a paper film structure or a paper aluminum embedded film structure; the outer sealing layer is arranged to be of a paper-aluminum embedded film structure and comprises a plurality of paperboard layers and an aluminum plate layer embedded in the middle of the paperboard layers.
By adopting the technical scheme, a user can select a paper film structure prepared from paper only or a paper aluminum embedded film structure formed by paper and aluminum, so that the paper aluminum embedded film structure can meet different production and processing requirements and has better use flexibility; and in the paper aluminum embedded film structure, the aluminum plate layer is embedded in the paperboard layer, so that the effect of improving the structural strength of the packaging film is achieved.
The present invention in a preferred example may be further configured to: the aluminum plate layer is including soft aluminum plate and stereoplasm aluminum plate, just soft aluminum plate and stereoplasm aluminum plate establish the position in the intraformational inlaying of cardboard and are corresponding to the hem and the plane of packing carton respectively.
Through adopting above-mentioned technical scheme, soft aluminum plate and stereoplasm aluminum plate inlay respectively and locate the hem position department of packing carton and the plane position department of packing carton, play the hem and the planar effect of protection packing carton respectively, can play the effect that improves the hem intensity and the plane intensity of the interior sealing surface of liquid food packaging film simultaneously.
The present invention in a preferred example may be further configured to: the soft aluminum plate is bent along the extending direction of the folded edge of the packaging box to form a bending mark, and a bending groove is formed.
By adopting the technical scheme, the bending marks and the bending grooves which are arranged on the soft aluminum plate play a role in improving the easy-to-bend characteristic of the soft aluminum plate, namely certain balance is obtained between the bending property and the anti-deformation capacity of the liquid food packaging box.
The invention in a preferred example may be further configured to: and a protruding structure is formed on the surface of the hard aluminum plate facing the outer side of the packaging box.
Through adopting above-mentioned technical scheme, the protruding structure of shaping on stereoplasm aluminum plate both can play the effect that improves the positive structural strength of liquid food packaging film, can realize unevenness's decoration display with the outer decorative film of packing carton or outer printing film mutually supporting again.
The present invention in a preferred example may be further configured to: and coating the paperboard layers of the soft aluminum plates and the hard aluminum plates, and embossing along the edge trends of the soft aluminum plates and the hard aluminum plates to form a tear line structure.
Through adopting above-mentioned technical scheme, when needs retrieve the soft aluminum plate and the stereoplasm aluminum plate in the packaging film, recovery personnel or user can tear the cardboard layer of inner sealing through tear line structure to take out the inside soft aluminum plate and the stereoplasm aluminum plate of inner sealing, so that realize categorised purpose of retrieving.
Aiming at the defects in the prior art, the invention also aims to provide a processing technology of the liquid food packaging film, which achieves the purposes of reducing the number of production and processing links of the liquid food packaging film and corresponding forming equipment and further achieving the purpose of reducing the production and processing cost by pre-forming the outer sealing layer and the inner sealing layer and then completing the forming connection of the inner sealing layer and the blocking layer through the waste heat during the forming of the outer sealing layer and the blocking layer.
The above object of the present invention is achieved by the following technical solutions: the outer sealing layer and the inner sealing layer are formed in advance, the outer sealing layer and the bonding layer are connected with the blocking layer in a blowing and spraying and thermal forming processing mode, residual heat in thermal forming is recycled, the inner sealing layer and the blocking layer are adhered and fixed, and the purpose of reducing the production and processing operation cost of the liquid food packaging film is achieved in the three aspects of reducing the number of thermal forming links, the number of corresponding forming devices and thermal forming heat energy loss.
Through adopting above-mentioned technical scheme, the shaping is connected with the shaping of barrier layer outside sealing, adhesive linkage in advance to adopt the processing method of blowing to drench, thermoforming, and it is fixed with the adhesion of barrier layer to accomplish the interior sealing, realizes reducing the purpose of liquid food packaging film production and processing operation cost in the three aspect of reduction thermoforming link quantity, corresponding former quantity and thermoforming heat energy loss from waste heat when recycling thermoforming.
The present invention in a preferred example may be further configured to: when the outer seal layer is prepared in step S1, the soft aluminum plate and the hard aluminum plate are pre-arranged at the designated positions on the lower paperboard layer, then the lower paperboard layer and the upper paperboard layer are glued and molded by hot pressing, and finally the tear line structure is prepared by impressing on the upper paperboard layer corresponding to the edge trend of the soft aluminum plate and the hard aluminum plate; when the inner seal layer is prepared in step S1, a multilayer co-extrusion film blowing machine or a multilayer co-extrusion casting machine is used to blow and heat the inner surface layer to form the adhesion layer.
Through adopting above-mentioned technical scheme, soft aluminum plate and stereoplasm aluminum plate are fixed by two cardboard layer centre gripping, and two cardboard layers adopt the mode shaping of hot-pressing veneer fixed, are favorable to improving soft aluminum plate and stereoplasm aluminum plate including the inside stability of sealing.
In summary, the invention includes at least one of the following beneficial technical effects:
1. because the inner sealing layer is a pre-formed integrated structure, the integrated structure is utilized to carry out subsequent forming operation, compared with the traditional production mode of blowing, spraying and heating forming layer by layer, the number of links of production and processing of the liquid packaging film and corresponding forming production equipment are reduced, and the purpose of reducing the production cost of the liquid food packaging film is further achieved;
2. compared with the traditional liquid packaging film made of a paper-aluminum wrapping material or a film material, the liquid packaging film has the advantages of the inner sealing layer and the barrier layer and makes up the defects of the inner sealing layer and the barrier layer;
3. the user can select the outer sealing layer formed by pure paper boards according to actual conditions, and also can select the outer sealing layer formed by compounding the paper boards and the aluminum plates, so that the liquid packaging box has better selection adaptability, and the shock resistance of the liquid packaging box can be effectively improved;
4. the middle barrier layer and the inner surface layer in the inner cover form a double-layer barrier structure, so that the purpose of improving the barrier capability of the liquid food packaging film is achieved.
Drawings
FIG. 1 is a schematic view of a film longitudinal cross-section of a liquid food packaging film;
FIG. 2 is a schematic diagram of an exploded structure of the outer envelope;
fig. 3 is a process flow diagram of a liquid food packaging film.
In the figure, 1, an outer sealing layer; 11. a paperboard layer; 12. an aluminum plate layer; 2. a barrier layer; 3. an inner seal layer; 31. an adhesion layer; 32. an inner surface layer; 4. an adhesive layer; 5. a soft aluminum plate; 51. bending marks; 52. bending the groove; 6. a rigid aluminum plate; 7. a protrusion structure; 8. a tear line structure.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1, the liquid food packaging film disclosed by the present invention comprises an outer sealing layer 1, a barrier layer 2 and an inner sealing layer 3 which are sequentially formed from outside to inside, wherein an adhesive layer 4 is formed between the barrier layer 2 and the outer sealing layer 1 in an adhesion manner, so that the outer sealing layer 1 and the barrier layer 2 form an integrated base layer structure, and the inner sealing layer 3 is formed in an adhesion manner with the barrier layer 2, so as to prepare a main body film structure of the liquid food packaging film. The inner sealing layer 3 comprises an adhesion layer 31 and an inner surface layer 32 which form an integrated film structure in advance, and when the inner sealing layer 3 and the basic structure are formed, the residual heat generated in the forming operation of the outer sealing layer 1 and the blocking layer 2 can be utilized to complete the forming operation of the adhesion layer 31 of the inner sealing layer 3 and the blocking layer 2 of the basic structure, namely, the purpose of reducing the production and processing cost is realized by reducing the number of forming and processing links and the number of corresponding forming devices.
As shown in fig. 1, the adhesion layer 31 of the inner seal layer 3, the adhesive layer 4 between the outer seal layer 1 and the barrier layer 2 are formed by laminating ethylene acrylic acid copolymer material and heating to form, and respectively function to bond and form the outer seal layer 1 and the barrier layer 2, and the barrier layer 2 and the inner seal layer 3. The barrier layer 2 and the inner surface layer 32 of the inner sealing layer 3 are formed by thermally laminating metallocene polyethylene materials and forming, so that the barrier layer has the function of blocking liquid permeation, and the barrier layer 2 in the middle and the inner surface layer 32 of the inner sealing layer 3 are matched to form a double-layer barrier structure, so that the barrier capability of the liquid food packaging film is favorably improved.
As shown in fig. 1 and 2, the outer sealing layer 1 includes two outer surface structures with different structural forms, one is a paper film structure formed by paper material, and the other is a paper aluminum embedded film structure formed by combining paper and aluminum, the former has better recycling property and is convenient for production and processing, and the latter has better impact resistance property. When the outer sealing layer 1 is produced and processed by adopting a paper film structure, a multilayer paperboard is generally produced and prepared in a hot-pressing adhesion mode; when the outer cover layer 1 is produced and processed by adopting a paper-aluminum embedded film structure, a plurality of layers of paperboard sandwich the middle aluminum plate to form a sandwich structure that the upper paperboard layer 11 and the lower paperboard layer 11 fix the middle aluminum plate layer 12, and the upper paperboard layer 11 and the lower paperboard layer 11 are integrally formed by adopting a hot-press bonding mode.
Referring to fig. 1 and 2, the aluminum plate layer 12 includes two different types of the soft aluminum plate 5 and the hard aluminum plate 6, the hardness of the soft aluminum plate 5 is smaller than that of the hard aluminum plate 6, and the position of the soft aluminum plate 5 in the outer cover 1 corresponds to the folding edge position of the liquid food package box, and the position of the hard aluminum plate 6 in the outer cover 1 corresponds to the plane position of the liquid food package box, so as to respectively improve the deformation resistance of the liquid food package box at the folding edge position and the side position.
As shown in fig. 2, the soft aluminum plate 5 is formed by extending along the direction of the folded edge, a bending mark 51 is formed on the soft aluminum plate 5 by bending along the length direction thereof, a bending groove 52 is formed along the length direction thereof, and the arrangement of the bending mark 51 and the bending groove 52 improves the convenience of bending operation of the production personnel to the maximum extent on the basis of not influencing the structural strength of the soft aluminum plate 5. The side of the hard aluminum plate 6 facing the outer side of the packaging box is provided with the protruding structure 7 in a forming mode, the protruding structure 7 can play a role in improving the deformation resistance of the hard aluminum plate, and can be matched with a decorative film or a printing film outside the packaging box to form uneven patterns so as to achieve the purpose of further improving the decorative effect.
Referring to fig. 1 and 2, a paperboard layer 11 on the outer seal layer 1 is stamped and formed with a tear line structure 8 at a position for covering and covering the soft aluminum plate 5 and the hard aluminum plate 6, and the direction of the tear line structure 8 is opened along the shape direction of the soft aluminum plate 5 and the hard aluminum plate 6. When the liquid packaging box is used and is finished and needs to be recycled, the user can tear line structure 8 and open inside soft aluminum plate 5 and hard aluminum plate 6 to the user retrieves inside soft aluminum plate 5 and hard aluminum plate 6.
The present embodiment is further described below with reference to specific principles:
the outer sealing layer 1 and the inner sealing layer 3 are formed in advance, namely, hot-press bonding forming operation of paper or hot-press bonding embedding forming operation of the paperboard layer 11 and the aluminum board layer 12 is completed, forming operation of the adhesion layer 31 and the inner surface layer 32 is completed simultaneously, then the paperboard layer 11 on the lower layer of the outer sealing layer 1 is coated with the hot-forming adhesion layer 4, the barrier layer 2 is coated with the hot-forming adhesion layer 4, and the residual heat generated when the outer sealing layer 1, the adhesion layer 4 and the barrier layer 2 are formed is utilized to realize adhesion forming of the inner sealing layer 3 and the barrier layer 2.
Example two:
as shown in fig. 3, a processing technique of a liquid food packaging film comprises the following steps,
s1, an outer sealing layer 1 and an inner sealing layer 3 are formed in advance. When the outer sealing layer 1 is prepared, the soft aluminum plate 5 and the hard aluminum plate 6 are preset at the designated positions on the paperboard layer 11 at the lower layer, then the paperboard layer 11 at the lower layer and the paperboard layer 11 at the upper layer are formed by hot-press gluing, and finally the tearing line structure 8 is prepared on the paperboard layer 11 at the upper layer in an impressing mode corresponding to the edge trend of the soft aluminum plate 5 and the edge trend of the hard aluminum plate 6; meanwhile, a multilayer co-extrusion film blowing machine or a multilayer co-extrusion casting machine is adopted to blow and heat the inner surface layer 32 to form the adhesion layer 31.
S2, a multilayer co-extrusion film blowing machine or a multilayer co-extrusion casting machine is adopted to blow and spray the paperboard layer 11 on the lower layer of the outer sealing layer 1, and the bonding layer 4 is formed by heating.
And S3, blowing and showering on the outer surface of the bonding layer 4 by adopting a multi-layer co-extrusion film blowing machine or a multi-layer co-extrusion casting machine, and heating and forming the blocking layer 2.
S4, integrally laying the inner seal layer 3 which is formed in advance in the step S1 on the barrier layer 2 with the waste heat, and finishing the forming connection of the inner seal layer 3 and the barrier layer 2 by using the waste heat.
And S5, cooling the packaging film in the step S4, then cutting according to the requirement, and finally winding to obtain a finished product of the packaging film.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (7)

1. A liquid food packaging film characterized in that: the adhesive tape comprises an outer sealing layer (1), a blocking layer (2) and an inner sealing layer (3) which are sequentially formed to form an integral structure, wherein an adhesive layer (4) is formed and connected between the outer sealing layer (1) and the blocking layer (2), the inner sealing layer (3) comprises an adhesive layer (31) and an inner surface layer (32) which are formed in advance to form the integral structure, and the adhesive layer (31) is connected with the blocking layer (2) in a forming way; outer seal (1) sets up to paper aluminium and inlays and close the membrane structure, outer seal (1) including multi-layer paperboard layer (11) and inlay aluminum plate layer (12) of locating paperboard layer (11) centre, aluminum plate layer (12) are including soft aluminum plate (5) and stereoplasm aluminum plate (6), just soft aluminum plate (5) and stereoplasm aluminum plate (6) inlay in paperboard layer (11) and establish the position and correspond to the hem and the plane of packing carton respectively, it is formed with bending mark (51) to buckle along the hem extending direction of packing carton on soft aluminum plate (5) to offer and be formed with bending groove (52).
2. The liquid food packaging film according to claim 1, wherein: the barrier layer (2) and the inner surface layer (32) are matched to form a double-layer barrier structure, and the barrier layer (2) and the inner surface layer (32) are made of metallocene polyethylene.
3. The liquid food packaging film according to claim 1, wherein: the materials of the bonding layer (4) and the adhesion layer (31) are both ethylene acrylic acid copolymer.
4. The liquid food packaging film according to claim 1, wherein: and a protruding structure (7) is formed on the surface of the hard aluminum plate (6) facing the outer side of the packaging box.
5. The liquid food packaging film according to claim 1, wherein: and the paperboard layer (11) covering the soft aluminum plate (5) and the hard aluminum plate (6) is stamped along the edge trend of the soft aluminum plate (5) and the hard aluminum plate (6) to form a tear line structure (8).
6. A process for manufacturing a liquid food packaging film according to any one of claims 1 to 5, characterized in that: the method comprises the following steps of S1, pre-forming an outer sealing layer (1) and an inner sealing layer (3); s2, blowing and spraying on the paperboard layer (11) at the lower layer of the outer sealing layer (1) by adopting a multi-layer co-extrusion film blowing machine or a multi-layer co-extrusion casting machine, and heating to form the bonding layer (4); s3, blowing and showering on the outer sealing layer (1) by adopting a multi-layer co-extrusion film blowing machine or a multi-layer co-extrusion casting machine, and heating to form a blocking layer (2); s4, integrally laying the inner sealing layer (3) on the barrier layer (2) with the waste heat, and connecting the inner sealing layer (3) and the barrier layer (2) in a forming way; and S5, cooling, cutting and winding to obtain a finished product of the packaging film.
7. The liquid food packaging film processing technology of claim 6, wherein: when the outer sealing layer (1) is prepared in the step S1, a soft aluminum plate (5) and a hard aluminum plate (6) are preset at a designated position on a paperboard layer (11) at the lower layer, then the paperboard layer (11) at the lower layer and a paperboard layer (11) at the upper layer are formed by hot-press gluing, and finally a tearing line structure (8) is prepared on the paperboard layer (11) at the upper layer in an impressing mode corresponding to the edge trend of the soft aluminum plate (5) and the edge trend of the hard aluminum plate (6); when the inner seal layer (3) is prepared in step S1, the adhesion layer (31) is formed by blowing and heating on the inner surface layer (32) by using a multi-layer co-extrusion film blowing machine or a multi-layer co-extrusion casting machine.
CN202010317588.9A 2020-04-21 2020-04-21 Liquid food packaging film and processing technology thereof Active CN111497354B (en)

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CN112810277A (en) * 2020-12-31 2021-05-18 海宁市粤海彩印有限公司 High-strength liquid packaging film and production process thereof
CN113290931A (en) * 2021-06-07 2021-08-24 宁波市新兆印业有限公司 Paper packaging box processing method based on modified laminating process

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CN203994920U (en) * 2014-07-29 2014-12-10 杭州顶正包材有限公司 A kind of paper/PE cup easily opened cup cover film
CN110582399A (en) * 2017-05-05 2019-12-17 康斯坦蒂亚皮尔克有限责任两合公司 Recyclable, easily tearable packaging laminate with good barrier effect and method for producing the same

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CN201338791Y (en) * 2008-09-28 2009-11-04 葛敬银 Flexible packing multi-layer coextrusion heat-sealing film used for getting rid of compositing cementing compound
CN101875420A (en) * 2009-04-30 2010-11-03 翁文桂 Isolation laminated packaging material
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
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