CN114474933A - Recyclable barrier shrink film and preparation method thereof - Google Patents

Recyclable barrier shrink film and preparation method thereof Download PDF

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Publication number
CN114474933A
CN114474933A CN202210168411.6A CN202210168411A CN114474933A CN 114474933 A CN114474933 A CN 114474933A CN 202210168411 A CN202210168411 A CN 202210168411A CN 114474933 A CN114474933 A CN 114474933A
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CN
China
Prior art keywords
film
composite
barrier
evoh
pvdc
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Pending
Application number
CN202210168411.6A
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Chinese (zh)
Inventor
张伯先
柯向建
张仁俊
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Changzhou Juwei New Material Technology Co ltd
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Changzhou Juwei New Material Technology Co ltd
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Publication date
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Priority to CN202210168411.6A priority Critical patent/CN114474933A/en
Publication of CN114474933A publication Critical patent/CN114474933A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B25/00—Packaging other articles presenting special problems
    • B65B25/14—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form
    • B65B25/146—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form packaging rolled-up articles
    • 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)
  • Laminated Bodies (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

The invention discloses a recyclable barrier shrink film and a preparation method thereof, wherein the recyclable barrier shrink film comprises a barrier film and main films formed by surface films arranged on two sides of the barrier film, the periphery of the main film is a composite area, and the middle part of the main film is a laminating area; the composite area adopts an adhesive to composite the barrier film and the surface film; the width of the composite area is 5-10 mm; the adhesive is opaque, and the produced heat shrinkable film is equivalent to a 'wrapped edge' design, so that the composite area is only the peripheral part, the consumption of the adhesive is reduced, the adhesive area can be cut off after use to recycle the film materials of all layers, and the classified recycling and cost reduction of the shrinkable barrier film are realized.

Description

Recyclable barrier shrink film and preparation method thereof
Technical Field
The invention relates to the technical field of food preservative films, in particular to a recyclable barrier shrink film and a preparation method thereof.
Background
POF (oriented polypropylene) is a heat shrinkable film, is called a multilayer co-extruded polyolefin heat shrinkable film, is prepared by plasticizing and extruding linear low-density polyethylene (LLDPE) serving as an intermediate layer and copolymerized propylene (pp) serving as an inner layer and an outer layer by three extruders, and then carrying out die head molding, bubble inflation and other special processes, and is the most widely used environment-friendly heat shrinkable film at present.
In order to meet the daily living needs of people, a large amount of packaging materials are consumed everyday, for example, heat shrinkable films are used for external packaging of foods, goods and the like, a large amount of packaging waste is generated when the packaging materials are used in large amount, and the input waste treatment cost is increased. In order to reduce the amount of waste, the reduction, harmlessness, and recycling of plastic products have become major targets for sustainable development.
At present, the recycling of the plastic products of the heat shrinkable film is generally classified recycling, i.e. the plastic products of the same kind are classified into one kind for recycling. However, since the POF heat shrinkable film has a PP/LLDPE/PP three-layer co-extrusion composite structure, and the materials between the layers interact and are firmly bonded, it is very difficult to "cleanly" peel the middle layer from the inner layer and the outer layer in the POF, and thus it is difficult to realize the classified recycling of the films of the POF heat shrinkable film.
Disclosure of Invention
The invention provides a recyclable barrier shrink film aiming at the problem that the existing shrink film is difficult to recycle: the barrier film comprises a barrier film and a main body film formed by surface layer films arranged on two sides of the barrier film, wherein the periphery of the main body film is a composite area, and the middle part of the main body film is a laminating area; the composite area adopts adhesive to composite the barrier film and the surface film; the width of the composite area is 5-10 mm; the adhesive is opaque to light.
Preferably, the barrier film is an EVOH film.
Preferably, the surface film is a single-layer PE film or a composite double-layer PE film or a composite PE/PVDC film.
Preferably, the surface film is a composite PE/PVDC film, and the PVDC film is close to one side of the barrier film.
Preferably, the area of the lamination zone is more than 10 times that of the composite zone.
In addition, a preparation method of the recyclable barrier shrink film is provided, which comprises the following steps:
s1, processing and generating a PE/PVDC composite film through a co-extrusion process, cutting the PE/PVDC composite film into a rated width, rolling the PE/PVDC composite film, and cutting an EVOH film into a rated width, and rolling the EVOH film;
s2, leading out the EVOH film, coating adhesives on the transverse direction and two sides of the EVOH film at intervals of rated length, and bonding the PE/PVDC composite film and one surface of the EVOH film together at a descending station of the EVOH film through a compression roller to form a semi-finished film;
s3, turning over the semi-finished film, detecting the composite area through a photoelectric detection switch, coating adhesives on the transverse direction and two sides of the composite area, and bonding the PE/PVDC composite film and the other surface of the EVOH film together through a compression roller at a downlink station to form a finished film;
and S4, drying the finished film, disinfecting, rolling and packaging.
Preferably, in step S2, an adhesive is applied to one side of the EVOH film.
Preferably, the photoelectric detection switch comprises a laser emitting device and a receiving device which are arranged above and below the supplied materials; the application of the adhesive is controlled by the opening and closing of the adhesive.
The heat shrinkable film produced by the invention is equivalent to a 'wrapping edge' design, so that the composite area is only the peripheral part, the consumption of the adhesive is reduced, the adhesive area can be cut off after use to recycle the film materials of all layers, and the classified recycling and cost reduction of the shrinkable barrier film are realized.
Drawings
Figure 1 is a top view of a recyclable barrier shrink film.
Figure 2 is a schematic representation of a recyclable barrier shrink film layered structure.
Fig. 3 is a schematic diagram of the detection of the photo detection switch.
In FIG. 1, the stacking region; 2. a recombination zone; 3. a barrier film; 4. a top film; 5. a binder; 6. a laser emitting device; 7. and a receiving device.
Detailed Description
Example 1
As shown in fig. 1-2, the recyclable barrier shrink film of the present invention: the film comprises a main body film consisting of a barrier film 3 and surface layer films 4 arranged on two sides of the barrier film, wherein the periphery of the main body film is a composite area 2, and the middle part of the main body film is a laminating area 1; the compound area 2 adopts an adhesive 5 to compound the barrier film 3 and the surface film 4; the width of the compound area 2 is 5-10 mm; the adhesive 5 is opaque.
More specifically, the barrier film 3 is an EVOH film.
More specifically, the surface film 4 is a single-layer PE film or a composite double-layer PE film or a composite PE/PVDC film.
More specifically, the surface film 4 is a composite PE/PVDC film, and the PVDC film is on the side near the barrier film 3.
More specifically, the area of the laminating zone 1 is greater than 10 times the area of the composite zone 2.
Example 2
As shown in fig. 1-3, a method for making a recyclable barrier shrink film includes the steps of:
s1, processing and generating a PE/PVDC composite film through a co-extrusion process, cutting the PE/PVDC composite film into a rated width, rolling the PE/PVDC composite film, and cutting an EVOH film into a rated width, and rolling the EVOH film;
s2, leading out the EVOH film, coating adhesives 5 on the transverse direction and two sides of the EVOH film at intervals of rated length, and adhering the PE/PVDC composite film and one surface of the EVOH film together at a descending station of the EVOH film through a compression roller to form a semi-finished film;
s3, turning over the semi-finished film, detecting the composite area 2 through a photoelectric detection switch, coating adhesives 5 on the transverse direction and two sides, and bonding the PE/PVDC composite film and the other surface of the EVOH film together through a compression roller at a downstream station to form a finished film;
and S4, drying the finished film, disinfecting, rolling and packaging.
More specifically, in step S2, the adhesive 5 is applied to one side of the EVOH film.
More specifically, the photoelectric detection switch comprises a laser emitting device 6 and a receiving device 7 which are arranged above and below the supplied materials; the application of the adhesive 5 is controlled by the opening and closing thereof.
The heat shrinkable film produced by the invention has the design equivalent to 'edge wrapping' or 'edge sealing', so that the composite area is only the peripheral part, the consumption of the adhesive is reduced, the adhesive area can be cut off after the heat shrinkable film is used, and the film materials of all layers can be recycled, thereby realizing the classified recycling of the shrinkable barrier film and reducing the cost.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A recyclable barrier shrink film characterized by: the barrier film comprises a barrier film and a main body film formed by surface layer films arranged on two sides of the barrier film, wherein the periphery of the main body film is a composite area, and the middle part of the main body film is a laminating area; the composite area adopts adhesive to composite the barrier film and the surface film; the width of the composite area is 5-10 mm; the adhesive is opaque to light.
2. The recyclable barrier shrink film of claim 1, wherein: the barrier film is an EVOH film.
3. The recyclable barrier shrink film of claim 2, wherein: the surface layer film is a single-layer PE film or a composite double-layer PE film or a composite PE/PVDC film.
4. The recyclable barrier shrink film of claim 3, wherein: the surface film is a composite PE/PVDC film, and the PVDC film is close to one side of the barrier film.
5. The recyclable barrier shrink film of claim 4, wherein: the area of the lamination zone is more than 10 times that of the composite zone.
6. A preparation method of a recyclable barrier shrink film is characterized by comprising the following steps: the method comprises the following steps:
s1, processing and generating a PE/PVDC composite film through a co-extrusion process, cutting the PE/PVDC composite film into a rated width, rolling the PE/PVDC composite film, and cutting an EVOH film into a rated width, and rolling the EVOH film;
s2, leading out the EVOH film, coating adhesives on the transverse direction and two sides of the EVOH film at intervals of rated length, and bonding the PE/PVDC composite film and one surface of the EVOH film together at a descending station of the EVOH film through a compression roller to form a semi-finished film;
s3, turning over the semi-finished film, detecting the composite area through a photoelectric detection switch, coating adhesives on the transverse direction and two sides of the composite area, and bonding the PE/PVDC composite film and the other surface of the EVOH film together through a compression roller at a downlink station to form a finished film;
and S4, drying the finished film, disinfecting, rolling and packaging.
7. The method of making the recyclable barrier shrink film of claim 6, wherein: in step S2, an adhesive is applied to one surface of the EVOH film.
8. The method of making the recyclable barrier shrink film of claim 7, wherein: the photoelectric detection switch comprises a laser emitting device and a receiving device which are arranged above and below the incoming material; the application of the adhesive is controlled by the opening and closing of the adhesive.
CN202210168411.6A 2022-02-24 2022-02-24 Recyclable barrier shrink film and preparation method thereof Pending CN114474933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210168411.6A CN114474933A (en) 2022-02-24 2022-02-24 Recyclable barrier shrink film and preparation method thereof

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Application Number Priority Date Filing Date Title
CN202210168411.6A CN114474933A (en) 2022-02-24 2022-02-24 Recyclable barrier shrink film and preparation method thereof

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CN114474933A true CN114474933A (en) 2022-05-13

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050037152A1 (en) * 2003-07-30 2005-02-17 Wenbo Xie Methods for producing coated film
JP2006256626A (en) * 2005-03-15 2006-09-28 Toppan Printing Co Ltd Packaging bag having unidirectional tearability
CN203143313U (en) * 2013-03-05 2013-08-21 苏州恒星医用材料有限公司 Cold-sealing band aid package without natural latex
CN106739356A (en) * 2016-12-14 2017-05-31 江阴升辉包装材料有限公司 A kind of multi-layer co-extruded shrink film and production technology
CN206781164U (en) * 2017-05-25 2017-12-22 杭州科能新材料科技有限公司 A kind of efficient Obstruct membrane
CN109594416A (en) * 2018-11-26 2019-04-09 江苏万宝瑞达高新技术有限公司 Laser intensity-adjustable paper coating quantitative sensor and control method thereof
CN113844069A (en) * 2021-08-11 2021-12-28 东南大学 Preparation method of recyclable high-barrier high-strength composite film

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050037152A1 (en) * 2003-07-30 2005-02-17 Wenbo Xie Methods for producing coated film
JP2006256626A (en) * 2005-03-15 2006-09-28 Toppan Printing Co Ltd Packaging bag having unidirectional tearability
CN203143313U (en) * 2013-03-05 2013-08-21 苏州恒星医用材料有限公司 Cold-sealing band aid package without natural latex
CN106739356A (en) * 2016-12-14 2017-05-31 江阴升辉包装材料有限公司 A kind of multi-layer co-extruded shrink film and production technology
CN206781164U (en) * 2017-05-25 2017-12-22 杭州科能新材料科技有限公司 A kind of efficient Obstruct membrane
CN109594416A (en) * 2018-11-26 2019-04-09 江苏万宝瑞达高新技术有限公司 Laser intensity-adjustable paper coating quantitative sensor and control method thereof
CN113844069A (en) * 2021-08-11 2021-12-28 东南大学 Preparation method of recyclable high-barrier high-strength composite film

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