CN101654165A - Long-acting barrier quality-guaranteeing food packaging material and manufacturing method thereof - Google Patents

Abstract

The invention provides a long-acting barrier quality-guaranteeing food packaging material, which has nine layers or seven layers; the change of the layers is required by customers; the first layer (outer layer) is a PE layer, the second layer is a paper layer, the third layer is an adhesive layer and the adhesive is polyurethane water-borne adhesive, the fourth layer is a PVDC coating layer, and the other five or three layers consist of a coextrusion film structure. The material has good long-acting performance on the basis of high barrier property.

Description

Long-acting barrier quality-guaranteeing food packaging material and preparation method thereof

Technical field

The invention belongs to the packing field, particularly a kind of long-acting barrier quality-guaranteeing food packaging material and preparation method thereof.

Background technology

Know packing and transportation food liquid in the close packing container of the liquid that laminate wrapping material is manufactured in the prior art already; this packaging laminate comprises a plurality of independently layers; they lump together given finished product packing container with packaging product required mechanical property and chemical resistance; common packaging laminate has refill layer or back flow liner firm in structure but that can fold; these sandwich layer both sides protecting this wet quick property sandwich layer, and make wrapper can carry out heat seal with the outer coating of plastics preferably polyethylene simultaneously.The above-mentioned feasible close packing container of liquid that can produce dimensionally stable of this class packaging laminate that paper or ply of board and plastic layer are only arranged, but the leak tightness for oxygen and other gases is poor, therefore must add that one or more layers has bubble-tight material (being called barrier layer), so that this packaging laminate can be used as the packing container to oxygen sensitive product etc.Swedish patent 440519 discloses a kind of material, in the above the top layer of polyethylene alcohol layer that added of said packaging laminate.But also there is defective in this material, and Chinese patent ZL9619888.7 discloses a kind of laminate wrapping material that comprises polyvinyl alcohol layer and preparation method thereof for this reason, and its method for making adopts the method for extruding and coating, has added one deck plastic layer outside polyvinyl alcohol layer.But still there is very big defective on the manufacture craft, its procedure of processing be from two layers to three layers again to four layers again to five layers, the work programme complexity is loaded down with trivial details, be difficult for grasping, and cost of product height, the material of product also exists barrier low in addition, and heat sealability is bad, its low-friction coefficient and the bad shortcoming of low static behaviour.The shortcoming that the inventor exists according to above-mentioned prior art, the method for making and material (the China Patent No. ZL200410074523.7 of invention barrier liquid food flexible packing material, Granted publication CN1319722C), this material still exist can not long-acting use shortcoming, needs that can not the long-term packaged food of meet requirements.

Summary of the invention

At the shortcoming that above-mentioned prior art exists, the long-pending experience of being engaged in this area work for many years of the inventor, feasibility study repeatedly gets generation of the present invention eventually on the basis of former invention; The invention provides a kind of long-acting barrier quality-guaranteeing food packaging material and preparation method thereof, to solve the long-lasting problem of packing.

The technical solution used in the present invention is: a kind of long-acting barrier quality-guaranteeing food packaging material, material are divided into nine layers or seven layers, and the variation of level is according to customer requirement; Ground floor: skin, the PE layer, thickness 12 μ-15 μ, the second layer is a ply of paper, ply of paper adopts white kraft or paperboard, grammes per square metre 50-80 gram, ply of paper thickness 60 μ-90 μ. the 3rd layer of bonding glue-line, polyurethane water-base cement, the 4th layer of PVDC coating layer, thickness 2 μ-6 μ, remainder layer is made up of following five layers or three-layer co-extruded membrane structure, and general thickness is 50 μ-90 μ: 1, PE/ white PE/ white PE/ black PE/ clear PE; 2, PE/ white PE/ black PE/ white PE/ clear PE; 3, white PE/ black PE/ clear PE; 4, black PE/ white PE/ clear PE.

A kind of method for making of long-acting barrier quality-guaranteeing food packaging material, production facilities mainly comprise coextrusion film blowing machine, coating machine, curtain coating compounding machine;

The first step uses the coextrusion film blowing machine to do following form substrate; Five layers or three-layer co-extruded membrane structure: 1, PE/ white PE/ white PE/ black PE/ clear PE; 2, PE/ white PE/ black PE/ white PE/ clear PE; 3, white PE/ black PE/ clear PE; 4, black PE/ white PE/ clear PE;

Second step used coating machine that PVDC is coated on the co-extrusion film, primary coat and face to be coated with;

The 3rd step used the curtain coating compounding machine just to unreel the co-extrusion film of coated PVDC, the adhesive coated operate portions of using the curtain coating compounding machine is with PVDC surface coating aqueous polyurethane glue, unreeling paper through the first compound operate portions and second, to be that printing surface carries out bonding, through the second compound operate portions paper printing surface current is prolonged the PE layer again, rolling again, cut, pack.

The characteristics that material of the present invention has:

1, gives the product high barrier, comprise low oxygen permeability and rate of perviousness;

2, low-friction coefficient, low static behaviour;

3, fragrance protectiveness, the guarantor performance of distinguishing the flavor of prolongs the shelf life of product.

4, heat sealability (low temperature) is good, has improved the efficient in can production.

5, good resistance to abrasion is protected product in carrying, placement, storage and transport process.

6, material non-toxic of the present invention, free from extraneous odour meet food hygienic standard fully, and coated film meets the FDA standard.

7, long-lasting good, be used for food and pack for a long time.

The present invention is described in further detail below in conjunction with specific embodiment:

The specific embodiment

A kind of long-acting barrier quality-guaranteeing food packaging material, material are divided into nine layers or seven layers, and the variation of level is according to customer requirement.Ground floor: skin; the PE layer; effect is the integraty of protection printed patterns; adhesive effect, thickness 12 μ-15 μ, the second layer is a ply of paper; ply of paper adopts white kraft or paperboard; grammes per square metre 50-80 gram, its effect are to support and printed patterns, embody client's quality and culture; ply of paper thickness 60 μ-90 μ. the 3rd layer of bonding glue-line; polyurethane water-base cement, effect are ply of paper and PVDC to be filmed be bonded together the 4th layer of PVDC coating layer; effect is that the air infiltration that enters with product that intercepts all gases goes out; guarantee product design, thickness 2 μ-6 μ, remainder layer is made up of following five layers or three-layer co-extruded membrane structure.General thickness is 50 μ-90 μ: 1, PE/ white PE/ white PE/ black PE/ clear PE; 2, PE/ white PE/ black PE/ white PE/ clear PE; 3, white PE/ black PE/ clear PE; 4, black PE/ white PE/ clear PE.

White PE and black PE are effect of light such as obstruct ultraviolet ray, and clear PE has been to seal the involution effect.

The method for making of above-mentioned long-acting barrier quality-guaranteeing food packaging material, production facilities mainly comprise coextrusion film blowing machine, coating machine, curtain coating compounding machine;

The first step uses the coextrusion film blowing machine to do following form substrate; Five layers or three-layer co-extruded membrane structure: 1, PE/ white PE/ white PE/ black PE/ clear PE; 2, PE/ white PE/ black PE/ white PE/ clear PE; 3, white PE/ black PE/ clear PE; 4, black PE/ white PE/ clear PE.

Second step used coating machine that PVDC is coated on the co-extrusion film, primary coat and face to be coated with;

The 3rd step used the curtain coating compounding machine just to unreel the co-extrusion film of coated PVDC, the adhesive coated operate portions of using the curtain coating compounding machine is with PVDC surface coating aqueous polyurethane glue, unreeling paper through the first compound operate portions and second, to be that printing surface carries out bonding, through the second compound operate portions paper printing surface current is prolonged the PE layer again, rolling again, cut, pack.

The above is a preferred embodiment of the present invention, and all changes of doing according to technical solution of the present invention when the function that is produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.

Claims (3)

1, a kind of long-acting barrier quality-guaranteeing food packaging material is characterized in that: material is divided into nine layers or seven layers, and the variation of level is according to customer requirement; Ground floor: skin is the PE layer, and the second layer is a ply of paper, the 3rd layer of bonding glue-line, and the polyurethane water-base cement, the 4th layer of PVDC coating layer, remainder layer is made up of following five layers or three-layer co-extruded membrane structure, and 1, PE/ white PE/ white PE/ black PE/ clear PE; 2, PE/ white PE/ black PE/ white PE/ clear PE; 3, white PE/ black PE/ clear PE; 4, black PE/ white PE/ clear PE.

2, long-acting barrier quality-guaranteeing food packaging material as claimed in claim 1, it is characterized in that: above-mentioned PE layer thickness 12 μ-15 μ, above-mentioned ply of paper adopts white kraft or paperboard, grammes per square metre 50-80 gram, ply of paper thickness 60 μ-90 μ. above-mentioned PVDC coating layer thickness 2 μ-6 μ, above-mentioned co-extrusion membrane structure general thickness is 50 μ-90 μ.

3, a kind of method for making of long-acting barrier quality-guaranteeing food packaging material as claimed in claim 1 is characterized in that: production facilities mainly comprises coextrusion film blowing machine, coating machine, curtain coating compounding machine;

The first step uses the coextrusion film blowing machine to do following form substrate; Five layers or three-layer co-extruded membrane structure: 1, PE/ white PE/ white PE/ black PE/ clear PE; 2, PE/ white PE/ black PE/ white PE/ clear PE; 3, white PE/ black PE/ clear PE; 4, black PE/ white PE/ clear PE;

Second step used coating machine that PVDC is coated on the co-extrusion film, primary coat and face to be coated with;

The 3rd step used the curtain coating compounding machine just to unreel the co-extrusion film of coated PVDC, the adhesive coated operate portions of using the curtain coating compounding machine is with PVDC surface coating aqueous polyurethane glue, unreeling paper through the first compound operate portions and second, to be that printing surface carries out bonding, through the second compound operate portions paper printing surface current is prolonged the PE layer again, rolling again, cut, pack.