CN201737295U

CN201737295U - Covering film with composite structure

Info

Publication number: CN201737295U
Application number: CN2010201302788U
Authority: CN
Inventors: 杨伟
Original assignee: JIANGYIN SUNRISE PACKAGING MATERIAL CO Ltd
Current assignee: JIANGYIN SUNRISE PACKAGING MATERIAL CO Ltd
Priority date: 2010-03-15
Filing date: 2010-03-15
Publication date: 2011-02-09
Anticipated expiration: 2020-03-15

Abstract

The utility model discloses a covering film with composite structure, which belongs to the processing field of the plastic packing film. The covering film comprises a surface layer and multiple layers of coextrusion films, wherein the surface layer and the multiple layers of coextrusion films are connected by a connecting layer; the surface layer is one of bi-directional stretch polyester film, bi-directional stretch polypropylene film, paper or bi-directional stretch nylon film, and the multiple layers of coextrusion film comprise at least five layers of coextrusion films or cast films; the surface layer and the multiple layers of coextrusion films are connected in a composite mode. The composite mode comprises a dry composite mode and an extrusion composite mode, wherein the connecting layer in the dry composite mode is an adhesive layer, and the connecting layer in the extrusion mode is an adhesive resin layer. The covering film can provide enough obstructing property and strength, ensures the safety of food covered by the covering film and can reduce the use amount of petrochemical material, which accords with the developing tendency of low-carbon economy.

Description

A kind of epiphragma of composite structure

Technical field

The utility model relates to plastic film, is specifically related to a kind of epiphragma of composite structure.

Background technology

Current, the soft molded application more and more widely that has been packaged to be, no matter be to adopt polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinylchloride (PVC), hard sheet moulding such as polyethylene terephthalate (PET) or aluminium foil, punch forming are still by the coextrusion mold film, the formed package that the mode of moulding such as composite molding film is made all needs to adopt flexible packaging film as joint filling material.In general, formed package is divided into barrier packaging and non-barrier packaging, and non-barrier formed package generally is exactly directly to adopt single kind forming materials, and the formed material big city of barrier package adopts the material that contains barrier layer.Current application gets the most widely that high barrier material is polyethylene vinyl acetate alcohol copolymer (EVOH) and polyvinylidene chloride (PVDC), and that common barrier material uses is nylon (PA) the most widely.The base material of moulding is general through hot-forming or hotly vacuumize moulding and make required shape, in packaging process with epiphragma by heat-sealing and ground sealing.

Generally all require epiphragma can with the supporting use of ground, the composite soft packaging film becomes the main packaged form of epiphragma.Epiphragma generally also is divided into barrier and non-barrier epiphragma, the epiphragma of barrier mostly adopts metallic film such as aluminium foil, the coating film is as the Biaxially oriented polypropylene of aluminizing (MOPP), the biaxial stretching polyester film (MPET) of aluminizing perhaps adopts polyethylene vinyl acetate alcohol copolymer (EVOH) co-extrusion film, and hot sealing layer is chosen as polyethylene (PE) according to the base material of moulding, polypropylene (PP), or ethylene-vinyl acetate copolymer (EVA), coating materials etc., composite structure have also comprised printed layers.The representative type structure has following structures, includes but not limited to these structures:

PET/AD/AL/AD/PE；

PET/AD/MPET/AD/PE；

PET/AD/EVOH/AD/PE；

BOPP/AD/AL/AD/CPP；

BOPP/AD/MPET/AD/EVA，

BOPA/AD/EVOH/AD/PE or the like.

These structures all are the dry type composite structures, the material that needs to have various difference in functionalitys combines by adhesion agent, barrier material adopts metallic film or coating, this composite structure one is that cost is higher, another is not enough can't to pass through metal detector owing to contained metallic material, need can't use through in the packing of metal detector at some, if adopt (EVOH) or (PA) plastic material as barrier material, make the material structure complexity again, such as in order to ensure certain barrier, need (EVOH) of compound one deck 10um, also need compound one deck (PA), to improve the intensity of material, make the cost of compound epiphragma improve like this.

In recent years,, multi-layer co-extruded film had also been obtained developing rapidly as using along with the development and progress of multi-layer co-extruded technology, such as at present widely used in the meat products formed package be exactly the multi-layer co-extruded film of barrier.Multi-layer co-extruded film exists work programme to simplify, and integrated cost is cheap, and the recycling advantage of environmental protection has obtained application more and more widely.But, multi-layer co-extruded film also has the shortcoming that it is difficult to avoid as epiphragma: the one, and film is a unsymmetric structure, curl than being easier to, the appearance of influence packing, the 2nd, multi-layer co-extruded film can only adopt surface printing, make printing ink on the top layer of epiphragma, sterilizing through poach or in transit, be easy to generate the hidden danger that printing ink comes off, influences product safety.

Design a kind of epiphragma and can avoid the compound epiphragma of dry type, or multi-layer co-extruded shortcoming, can be in conjunction with the epiphragma of the advantage of these two kinds of epiphragmas, becoming this technical field has a problem to be solved.

The utility model content

The purpose of this utility model is, proposed a kind of epiphragma of new structure, this epiphragma both can provide enough barrier and intensity, can guarantee the food security of content again, can reduce simultaneously the use amount of petrochemical industry material, meet the development tendency of the present age " low-carbon economy ".

For achieving the above object, the technical solution of the utility model is the epiphragma that proposes a kind of composite structure, it is characterized in that described epiphragma comprises superficial layer and multi-layer co-extruded rete, and described superficial layer is connected by articulamentum with multi-layer co-extruded rete.

Wherein, described superficial layer is the biaxial stretching polyester film, bidirectional stretching polypropylene film, a kind of in paper or the biaxial tension nylon membrane.

Wherein, described multi-layer co-extruded rete has at least and is five-layer co-squeezing blown film or cast film.

Wherein, described superficial layer is connected by complex method with multi-layer co-extruded rete, and described complex method comprises that dry type is compound, or extrudes compoundly, and the articulamentum during described dry type is compound is an adhesive layer, and the described articulamentum of extruding in compound is the binding resin layer.

Wherein, in described multi-layer co-extruded rete, contain one or more layers of barrier material, requiring of the thickness of described barrier material and barrier property is proportional, and described barrier material is a nylon, one or both in polyethylene vinyl acetate ester copolymer or the polyvinylidene chloride.

Wherein, on described superficial layer, can be printed with the picture-character information layer.

Advantage of the present utility model and beneficial effect are: the epiphragma of this composite structure only needs to be formed through once-combined by double-layer films, and technology is simple, and loss is few, and integrated cost is low.Two-layer complementing one another in this composite structure epiphragma, the skin-material layer provides good deflection and mechanical property for epiphragma, the top layer all is good printable fabric simultaneously, can make epiphragma material with exquisite printing effect, the India side formula can avoid packing material directly to contact with printing ink in the employing, ensures safety.The radical function of multi-layer co-extruded material layer is for epiphragma provides enough obstructing capacities, guarantees the shelf life of packing material, uses as the hot sealing layer material simultaneously.In multi-layer co-extruded material, set the kind and the content of barrier material, avoid the not enough or excessive packaging of barrier according to operating needs.Further, make full use of multi-layer co-extruded advantage, the design by the hot sealing layer material in co-extrusion, can also make can with the epiphragma material of moulding base material heat-sealing not of the same race, also can make and have the epiphragma of easily taking off effect.This new structure design has made full use of the advantage of skin-material and multi-layer co-extruded method, can reduce the thickness of epiphragma greatly, reduces the raw-material use amount of petrochemical industry, realizes the minimizing and sustainableization of packing.

Description of drawings

Fig. 1 is the composite structure scheme drawing of the utility model embodiment 1;

Fig. 2 is the composite structure scheme drawing of the utility model embodiment 2;

Fig. 3 is the composite structure scheme drawing of the utility model embodiment 3;

Fig. 4 is the composite structure scheme drawing of the utility model embodiment 4;

Fig. 5 is the composite structure scheme drawing of the utility model embodiment 5;

Among the figure:

The English abbreviation	The Chinese full name
		EVA	Ethylene-vinyl acetate copolymer
EVOH	Ethylene-vinyl alcohol copolymer
		PE	Polyethylene
LDPE	LDPE (Low-density polyethylene plastics)
		PA	Polyamide (nylon)
SURLYN	Ionomer
		ADH	Adhesion agent
Tie	Binding resin
		Ink	Lettering (printed layers)
B	Multi-layer co-extruded film
		P	The top layer
L	Articulamentum
		Lid	Epiphragma
Paper	Paper
		PP	Polypropylene
CPP	Cast polypropylene
		AL	Aluminium foil
PE-Easy?peel	Has the PE layer of easily taking off effect
		BOPET	The biaxial stretching polyester film
BOPP	Bidirectional stretching polypropylene film

BOPA	The biaxial tension nylon membrane

The specific embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection domain of the present utility model with this.

The concrete technical scheme of implementing of the utility model is:

Embodiment 1:

Structure as shown in Figure 1: superficial layer is that BOPET prints, compound compound by dry type with PP TYPE B, PP TYPE B is the seven-layer co-extrusion film, wherein contain the EVOH barrier layer, wherein the thickness of B layer is 40～60 microns, and wherein the thickness of barrier layer EVOH can be set at the 5-15 micron according to the requirement of barrier property.This structure epiphragma had both had good planeness and heat-sealing ability, had and had enough obstructing capacities.

Embodiment 2:

Structure as shown in Figure 2: superficial layer is that BOPET prints, compound compound by dry type with PP TYPE B, PP TYPE B is eight layers of coextruded film, wherein contain EVOH barrier layer and PA barrier layer, wherein three layers of PA material make epiphragma promptly have excellent barrier property, have very excellent anti-puncture ability and pulling strengrth again, can be applicable to packing requirements than in the higher packing, simultaneously the hot sealing layer of coextruded film is designed to have and easily takes off function, make epiphragma also have the effect of easily taking off, make things convenient for the customer to use.This structural cover can have obstructing capacity concurrently, resists puncture and easily takes off effect, and the gross thickness of epiphragma can be controlled in below 80 microns, can make the integrated cost of epiphragma significantly reduce.

Embodiment 3:

Structure as shown in Figure 3: superficial layer is that BOPET prints, compound compound by extruding with PP TYPE B, PP TYPE B is nine layers of coextruded film, wherein contain EVOH barrier layer and PA barrier layer, wherein two-layer PA material makes epiphragma promptly have excellent barrier property, have very excellent anti-puncture ability and pulling strengrth again, can be applicable to packing requirements than in the higher packing.This structural cover can have obstructing capacity concurrently, anti-puncture and softness, and the gross thickness of epiphragma can be controlled in below 60 microns, can make the integrated cost of epiphragma significantly reduce.

Embodiment 4:

Structure as shown in Figure 4: superficial layer is BOPP, need not print, compound compound by dry type with PP TYPE B, PP TYPE B is the five-layer co-squeezing film, wherein contain the PA barrier layer, the PA material makes epiphragma promptly have barrier property preferably simultaneously, has very excellent anti-puncture ability and pulling strengrth again, and other layer constitutes by PP.The advantage one of the epiphragma of this structure is to carry out involution with the PP bottom substrate, the 2nd, but can make the epiphragma material of digestion resistant.

Embodiment 5:

Structure as shown in Figure 5: superficial layer is that paper carries out surface printing, compound compound by dry type with PP TYPE B, PP TYPE B is nine layers of coextruded film, wherein contain the EVOH barrier layer, hot sealing layer with coextruded film is designed to EVA simultaneously, make epiphragma have can with the PE base material, the heat-sealing of the formed body of PP base material or PS base material has usability widely.

The above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. the epiphragma of a composite structure is characterized in that, described epiphragma comprises superficial layer and multi-layer co-extruded rete, and described superficial layer is connected by articulamentum with multi-layer co-extruded rete.

2. epiphragma as claimed in claim 1 is characterized in that, described superficial layer is the biaxial stretching polyester film, bidirectional stretching polypropylene film, a kind of in paper or the biaxial tension nylon membrane.

3. epiphragma as claimed in claim 2 is characterized in that, described multi-layer co-extruded rete has at least and is five-layer co-squeezing blown film or cast film.

4. epiphragma as claimed in claim 3, it is characterized in that, described superficial layer is connected by complex method with multi-layer co-extruded rete, described complex method comprises that dry type is compound, or extrude compound, articulamentum during described dry type is compound is an adhesive layer, and the described articulamentum of extruding in compound is the binding resin layer.

5. epiphragma as claimed in claim 4, it is characterized in that, in described multi-layer co-extruded rete, contain one or more layers of barrier material, requiring of the thickness of described barrier material and barrier property is proportional, and described barrier material is nylon or polyethylene vinyl acetate ester copolymer or polyvinylidene chloride.

6. as each described epiphragma in the claim 1 to 5, it is characterized in that, on the inner layer surface of described superficial layer, can be printed with the picture-character information layer.