CN210821278U

CN210821278U - Three-layer hinders oxygen complex film and packing carton

Info

Publication number: CN210821278U
Application number: CN201920595640.XU
Authority: CN
Inventors: 卜翔; 钱伟; 李仁华
Original assignee: Wuhan Laibao New Materials Technology Co ltd
Current assignee: Wuhan Laibao New Materials Technology Co ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-06-23
Anticipated expiration: 2029-04-26

Abstract

The utility model discloses an oxygen complex film and packing carton are hindered to three-layer, the oxygen complex film is hindered to three-layer is including the PETG thin layer, EVOH thin layer and the biaxial stretching thin layer that stack gradually the setting, wherein, PETG thin layer with it is compound through first bond line between the EVOH thin layer, EVOH thin layer with it is compound through the second bond line between the biaxial stretching thin layer. The utility model provides a three-layer hinders oxygen complex film when the epiphragma that is used as PET packing carton uses, can not only realize the sealed save of food with PET packing carton body cooperation encapsulation, can also separate completely with PET packing carton body moreover after the encapsulation to make the discarded PET packing carton after finishing using can regard as PET plastics recycling.

Description

Three-layer hinders oxygen complex film and packing carton

Technical Field

The utility model relates to a packaging material technical field, in particular to food package technical field, concretely relates to three-layer hinders oxygen complex film and packing carton.

Background

The multilayer composite packaging material prepared by the multilayer coextrusion method can meet the standards of boiling resistance, baking resistance and low-temperature freezing resistance, and part of the multilayer composite packaging material also has the functions of gas barrier, shading, moisture resistance and the like, thereby having wide application range. When the existing multilayer composite packaging material is selected as a food packaging material, for example, when the multilayer composite packaging material is used as a cover film of a PET (polyethylene terephthalate) food packaging box, the PET food packaging box is difficult to completely peel off from the PET food packaging box after being packaged with a PET packaging box body, so that the PET food packaging box can only be treated as waste products due to the fact that the PET food packaging box contains impurities which are difficult to separate during recycling, and cannot be recycled as PET plastics.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a three-layer hinders oxygen complex film and packing carton aims at providing the packaging material that can separate completely with PET packing carton body after the encapsulation.

In order to realize the above-mentioned purpose, the utility model provides a three-layer hinders oxygen complex film, including PETG thin layer, EVOH thin layer and the biaxial stretching thin layer of range upon range of setting in proper order, wherein, PETG thin layer with it is compound through first bond line between the EVOH thin layer, EVOH thin layer with it is compound through the second bond line between the biaxial stretching thin layer.

Optionally, the thickness ratio of the PETG film layer, the EVOH film layer and the biaxially oriented film layer is (5-7): (6-9): (5-7).

Optionally, the total thickness of the three-layer oxygen-barrier composite film is 50-120 μm.

Optionally, the sum of the thicknesses of the first bonding layer and the second bonding layer accounts for 3-7% of the total thickness of the three-layer oxygen barrier composite film.

Optionally, the first adhesive layer and the second adhesive layer have the same thickness.

Optionally, the material of the biaxially oriented film layer comprises at least one of a biaxially oriented polypropylene film and a biaxially oriented polyester film.

Further, the utility model also provides a packing box, including end box and epiphragma, wherein, end box is the PET material, the epiphragma is as above the three-layer hinder the oxygen complex film, just the three-layer hinder the oxygen complex film with when end box encapsulates, make the three-layer hinder the PETG thin layer of oxygen complex film with end box laminating carries out the heat-seal.

The utility model provides an among the technical scheme, constitute the three-layer by the PETG thin layer, the EVOH thin layer and the biaxial stretching thin layer that stack gradually the setting and hinder the oxygen complex film, through regard as being used for with the PETG thin layer and carry out the skin of encapsulation with the PET packing carton for this three-layer hinders the oxygen complex film and when the epiphragma that is used as the PET packing carton uses, can also separate with PET packing box body complete separation after the encapsulation, thereby make the discarded PET packing carton after finishing using can regard as PET plastics to retrieve and recycle.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the three-layer oxygen barrier composite film provided by the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Three-layer oxygen-barrier composite film	30	Biaxially oriented film layer
10	PETG film layer	41	First adhesive layer
				20	EVOH film layer	42	Second adhesive layer

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

When the existing multilayer composite packaging material is selected as a food packaging material, for example, when the multilayer composite packaging material is used as a cover film of a PET (polyethylene terephthalate) food packaging box, the PET food packaging box is difficult to completely peel off from the PET food packaging box after being packaged with a PET packaging box body, so that the PET food packaging box can only be treated as waste products due to the fact that the PET food packaging box contains impurities which are difficult to separate during recycling, and cannot be recycled as PET plastics.

In view of this, the utility model provides a three-layer hinders oxygen complex film, through the selection of each layer material in the complex film, realizes hindering the oxygen function of oxygen complex film and can with the purpose that the PET packing carton body separates completely after the encapsulation, figure 1 is the utility model provides an embodiment of three-layer hinders oxygen complex film. Referring to fig. 1, in the present embodiment, the three-layer oxygen-barrier composite film 100 includes a PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol) film layer 10, an EVOH (ethylene-vinyl alcohol copolymer) film layer 20, and a biaxially oriented film layer 30, which are sequentially stacked, wherein the PETG film layer 10 and the EVOH film layer 20 are combined through a first adhesive layer 41, and the EVOH film layer 20 and the biaxially oriented film layer 30 are combined through a second adhesive layer 42. The PETG film layer 10 is mainly used for packaging the PET packaging box body and plays a certain supporting role; the EVOH film layer 20 is used as a barrier layer and mainly plays a role in oxygen resistance; the biaxially oriented film layer 30 serves as a support layer and plays a certain role in protecting the EVOH film layer 20, so that direct contact between the EVOH film layer 20 and the outside is reduced, the influence of the external environment on the barrier property of the EVOH film layer 20 is reduced, and the barrier property of the three-layer oxygen-barrier composite film 100 on oxygen is ensured; the first adhesive layer 41 and the second adhesive layer 42 are each formed of an adhesive, and may be selected, for example, from a polyurethane adhesive, an acrylate adhesive, or a biodegradable polymer adhesive, and the like.

In the technical proposal provided by the utility model, the PETG film layer 10, the EVOH film layer 20 and the two-way stretching film layer 30 which are sequentially stacked form a three-layer oxygen-barrier composite film 100 which can be completely separated from a PET packing box body after being packaged when being used as a cover film of the PET packing box, thereby leading the waste PET packing box after being used to be recycled as PET plastic, improving the utilization value of the waste PET packing box after being used by consumers, and leading the waste materials and leftover materials generated in the forming and processing process of the PET packing box to be recycled, being beneficial to reducing the production cost of the PET packing box, saving petroleum resources, reducing environmental pollution and the like, in addition, the three-layer oxygen-barrier composite film 100 provided by the utility model is matched with the PET packing box for food packaging, also prolonging the fresh-keeping period of food, thereby being beneficial to expanding the sales radius of the product, promoting the development of the industry.

The utility model provides an among the three-layer hinders oxygen complex film, right PETG thin layer 10 EVOH thin layer 20 and twoNot do specifically and restrict to the thickness of tensile thin layer 30, as long as possess above-mentioned three layer construction's composite film simultaneously, all belong to three-layer hinder oxygen complex film 100, have good separation performance to and can separate completely with PET packing box body after the encapsulation. Preferably, in this embodiment, the thickness ratio of the PETG film layer 10, the EVOH film layer 20, and the biaxially oriented film layer 30 is (5-7): (6-9): (5-7), so that the obtained three-layer oxygen-barrier composite film 100 has good oxygen-barrier performance, and the barrier rate to oxygen can reach 0.9cc/m²D below, and after being packaged with the PET packaging box body, the PET packaging box body can be completely separated from the PET packaging box body only by simple tearing, so that the used and abandoned PET packaging box can be directly recycled as PET plastics.

For the barrier film, generally, the thicker the barrier film is, the better the barrier property is, but on the premise that the barrier property meets the use requirement, the thinner the barrier film is, the better the barrier property is, which is beneficial to reducing the raw material cost, and the product is lighter, in this embodiment, the thickness of the three-layer oxygen barrier composite film 100 is preferably 50-120 μm, which has a better barrier property, can meet the food packaging requirement, especially the packaging requirement of fresh food, and the mechanical property can also meet the use requirement.

The first adhesive layer 41 serves to adhesively compound the PETG film layer 10 and the EVOH film layer 20, the second adhesive layer 42 serves to adhesively compound the EVOH film layer 20 and the biaxially oriented film layer 30, and the thicknesses of the first adhesive layer 41 and the second adhesive layer 42 are not limited as long as effective adhesion can be achieved. In this embodiment, the sum of the thicknesses of the first adhesive layer 41 and the second adhesive layer 42 is preferably 3 to 7%, and more preferably 4 to 6% of the total thickness of the three-layer oxygen-barrier composite film 100, so that the effective adhesion between the PETG film layer 10 and the EVOH film layer 20, and between the EVOH film layer 20 and the biaxially oriented film layer 30 can be realized, and the influence on the barrier performance of the three-layer oxygen-barrier composite film due to the thickness deviation of the adhesive layers can be avoided.

Further, the thicknesses of the first adhesive layer 41 and the second adhesive layer 42 may be set to be the same or different, and in this embodiment, the thicknesses of the first adhesive layer 41 and the second adhesive layer 42 are preferably the same, so that the process during the multi-layer composite extrusion is easier to regulate, and the production difficulty is favorably reduced.

The biaxially oriented film layer 30 is formed by biaxially oriented film, which is made by extruding polymer particles to form a sheet and then stretching the sheet in longitudinal and transverse directions. In this embodiment, the biaxially oriented film may be at least one of a biaxially oriented polypropylene film (BOPP) and a biaxially oriented polyester film (BOPET), and may be any one of the BOPP and the BOPET, or a composite film formed by the BOPP and the BOPET, and has excellent mechanical properties and a better protection effect on the EVOH film layer 20. In other embodiments of the present invention, the three-layer oxygen-barrier composite film 100 is selected as one of the outer layers of the biaxially oriented film, and the biaxially oriented film further has the feature of easy printing, so that the surface of the biaxially oriented film layer 30 can be directly printed with characters or patterns, and the composite film product with the printed layer is obtained to mark the packaged product.

Further, the utility model provides a packing carton, including end box and epiphragma, wherein, end box is the PET material, the epiphragma is as above the three-layer hinder oxygen complex film 100, just the three-layer hinder oxygen complex film 100 with end box when encapsulating, make the three-layer hinder the PETG thin layer 10 of oxygen complex film 100 with end box laminating carries out the heat-seal, the packing carton that so obtains, when the consumer is using, the epiphragma can be directly through the mode of tearing and drawing with end box thorough separation for the discarded PET packing carton after the consumer uses can directly obtain recycling as the PET plastics.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The three-layer oxygen-barrier composite film is characterized by comprising a PETG film layer, an EVOH film layer and a biaxially oriented film layer which are sequentially stacked, wherein the PETG film layer and the EVOH film layer are compounded through a first adhesive layer, and the EVOH film layer and the biaxially oriented film layer are compounded through a second adhesive layer.

2. The three-layer oxygen-barrier composite film according to claim 1, wherein the thickness ratio of the PETG film layer, the EVOH film layer and the biaxially oriented film layer is 5-7: 6-9: 5 to 7.

3. The three-layer oxygen barrier composite film according to claim 1, wherein the total thickness of the three-layer oxygen barrier composite film is 50 to 120 μm.

4. The three-layer oxygen barrier composite film according to claim 1, wherein the sum of the thicknesses of the first adhesive layer and the second adhesive layer accounts for 3-7% of the total thickness of the three-layer oxygen barrier composite film.

5. The three-layer oxygen barrier composite film of claim 1 wherein the first adhesive layer and the second adhesive layer are the same thickness.

6. The three-layer oxygen barrier composite film according to claim 1, wherein the material of the biaxially oriented film layer comprises at least one of a biaxially oriented polypropylene film and a biaxially oriented polyester film.

7. The packaging box is characterized by comprising a bottom box and a cover film, wherein the bottom box is made of PET (polyethylene terephthalate), the cover film is the three-layer oxygen-barrier composite film according to any one of claims 1 to 6, and when the three-layer oxygen-barrier composite film is packaged with the bottom box, a PETG (polyethylene terephthalate glycol) thin film layer of the three-layer oxygen-barrier composite film is attached to the bottom box for heat sealing.