CN104772959B - A kind of food packaging environment-friendlythin thin film - Google Patents

Abstract

The invention discloses a kind of food packaging environment-friendlythin thin film, by three-layer thin-film by co-extrusion film forming, being divided into outer layer, middle level and internal layer, described outer layer is HOPP layer, and middle level is COPP layer, and internal layer is composite bed；The present invention there was added modified corn powder in traditional components, and the film forming of preparation is good, and glossiness is good, neither too hard, nor too soft, acid and alkali-resistance, anticorrosive, easily reclaim, be a kind of new green environment protection material, solve the deficiency that domestic PVC film in the market exists.

Description

A kind of food packaging environment-friendlythin thin film

Technical field

The present invention relates to thin film technique field, be specifically related to a kind of food packaging environment-friendlythin thin film.

Background technology

Nearly ten years, production and the application of Chinese Plastics flexible packaging film are rapidly developed, but to Paying attention to not enough in the package plastics of food thin film problem that may be detrimental to health, the nearest whole nation is all being paid close attention to To have PVC fresh-preserving film to be potentially carcinogenic event be exactly a good example.Its tangible China, PVC film Using except preservative film, the most a large amount of uses are in candy twisting packaging, snack food kink packaging.Confection, The kink packaging of snack food is all that PVC torsion film directly carries out contacting with food, meanwhile, and its consumer group Being based on children and adolescents, the problem that therefore PVC torsion film may be detrimental to health to cause equally All sectors of society is paid attention to.

The most common Memorability torsion film mainly has PVC film, PET film.Send out in American-European some Reach country and forbidden using the thin film of PVC class in terms of packaging for foodstuff, the substitute is PETG and two-way OPS oriented polystyrene (BOPS) thin film, although China does not forbids that PVC packing film uses the most in plain text, but Along with the raising day by day of environmental requirement, it is that environmental protection is wanted that Devoting Major Efforts To Developing substitutes the novel green product of PVC packaging film The fundamental solution asked.

Polypropylene itself is tasteless nontoxic, light specific gravity, and recovery process is simple, belongs to environment-friendly products, is to replace Domestic now widely used Memorability PVC torsion film and the preferred material of PETG torsion film.

Summary of the invention

The technical problem to be solved is to provide a kind of safety and sanitation, the food bag of environmental protection and energy saving Dress environment-friendlythin thin film.

The technical problem to be solved realizes by the following technical solutions:

A kind of food packaging environment-friendlythin thin film, by three-layer thin-film by co-extrusion film forming, is divided into outer layer, middle level And internal layer, described outer layer is HOPP layer, and middle level is COPP layer, and internal layer is composite bed；

Described composite bed is made up of the component of following parts by weight: polrvinyl chloride 20 parts, binder resin 15 Part, 0.5 part of antioxidant, oxidic polyethylene 2 parts, ethyl acetate 2 parts, metallocene PE 2 parts, methyl Acrylic acid methyl ester 1.5 parts, epoxy soybean oil 1.5 parts, cyclohexanone 1.5 parts, 5 parts of modified corn powder, ash calcium 1.5 parts of powder, 2 parts of carbon fiber, bamboo fibre 2 parts, sepiolite cashmere 1.5 parts, 2 parts of aluminum sulfate, imitative spider silk are fine Tie up 2 parts；During preparation, said components is sent in kneader mixing uniformly, in 150 DEG C process 6 hours, join Make Composite rubber material；

The preparation method of described modified corn powder is as follows:

1) with fresh mature Semen Maydis as raw material, Semen Maydis roguing, more than 60%, is cleaned by corn content, Send into tumbler after wash clean and carry out tumbling process, during tumbling every 5-8 minute evacuation once, take out every time Tumbling 5-10 minute, then vacuum pumping after complete vacuum, so circulation 2-4 time；

2) Semen Maydis after tumbling is squeezed the juice, collect corn juice；

3) corn juice is spray-dried, then grinds in powder；Above-mentioned spray drying is very Carrying out under Altitude, temperature controls at 20-35 DEG C.

The thickness of described outer membrane respectively 6 microns, not 13 microns of middle level, internal layer are 6 microns.

It is a further object to provide a kind of method preparing above-mentioned thin film, step is as follows:

1) respectively composition outer layer and the HOPP in middle level, COPP are carried out mixing, formed poly- Polypropylene layer material and COPP layer material；

2) poly-polypropylene layer material, COPP layer material and Composite rubber material are squeezed through T-shaped die head Go out；

3) the most cooled roller of thin film after extrusion cools down, draws at stretching, thickness measure, surface corona Reason, trimming, winding film forming, check, put in storage.

The invention has the beneficial effects as follows: the present invention there was added modified corn powder in traditional components, preparation Film forming is good, and glossiness is good, neither too hard, nor too soft, acid and alkali-resistance, anticorrosive, easily reclaim, be a kind of new Type green material, solves the deficiency that domestic PVC film in the market exists.

Detailed description of the invention

For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be readily apparent from Solve, below in conjunction with specific embodiment, the present invention is expanded on further.

Embodiment 1

A kind of food packaging environment-friendlythin thin film, by three-layer thin-film by co-extrusion film forming, is divided into outer layer, middle level And internal layer, described outer layer is HOPP layer, and middle level is COPP layer, and internal layer is composite bed；

Described composite bed is made up of the component of following parts by weight: polrvinyl chloride 20 parts, binder resin 15 Part, 0.5 part of antioxidant, oxidic polyethylene 2 parts, ethyl acetate 2 parts, metallocene PE 2 parts, methyl Acrylic acid methyl ester 1.5 parts, epoxy soybean oil 1.5 parts, cyclohexanone 1.5 parts, 5 parts of modified corn powder, ash calcium 1.5 parts of powder, 2 parts of carbon fiber, bamboo fibre 2 parts, sepiolite cashmere 1.5 parts, 2 parts of aluminum sulfate, imitative spider silk are fine Tie up 2 parts；During preparation, said components is sent in kneader mixing uniformly, in 150 DEG C process 6 hours, join Make Composite rubber material；

The preparation method of described modified corn powder is as follows:

1) with fresh mature Semen Maydis as raw material, Semen Maydis roguing, more than 60%, is cleaned by corn content, Send into tumbler after wash clean and carry out tumbling process, during tumbling every 5-8 minute evacuation once, take out every time Tumbling 5-10 minute, then vacuum pumping after complete vacuum, so circulation 2-4 time；

2) Semen Maydis after tumbling is squeezed the juice, collect corn juice；

3) corn juice is spray-dried, then grinds in powder；Above-mentioned spray drying is very Carrying out under Altitude, temperature controls at 20-35 DEG C.

It is a further object to provide a kind of method preparing above-mentioned thin film, step is as follows:

1) respectively composition outer layer and the HOPP in middle level, COPP are carried out mixing, formed poly- Polypropylene layer material and COPP layer material；

2) poly-polypropylene layer material, COPP layer material and Composite rubber material are squeezed through T-shaped die head Go out；

3) the most cooled roller of thin film after extrusion cools down, draws at stretching, thickness measure, surface corona Reason, trimming, winding film forming, check, put in storage.

The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.One's own profession Skilled person will appreciate that of industry, the present invention is not restricted to the described embodiments, above-described embodiment and explanation The principle that the present invention is simply described described in book, without departing from the spirit and scope of the present invention, The present invention also has various changes and modifications, and these changes and improvements both fall within claimed invention model In enclosing.Claimed scope is defined by appending claims and equivalent thereof.

Claims (2)

1. a food packaging environment-friendlythin thin film, by three-layer thin-film by co-extrusion film forming, be divided into outer layer, in Layer and internal layer, described outer layer is HOPP layer, and middle level is COPP layer, and internal layer is composite bed； It is characterized in that:

Described composite bed is made up of the component of following parts by weight: polrvinyl chloride 20 parts, binder resin 15 Part, 0.5 part of antioxidant, oxidic polyethylene 2 parts, ethyl acetate 2 parts, metallocene PE 2 parts, methyl Acrylic acid methyl ester 1.5 parts, epoxy soybean oil 1.5 parts, cyclohexanone 1.5 parts, 5 parts of modified corn powder, ash calcium 1.5 parts of powder, 2 parts of carbon fiber, bamboo fibre 2 parts, sepiolite cashmere 1.5 parts, 2 parts of aluminum sulfate, imitative spider silk are fine Tie up 2 parts；During preparation, said components is sent in kneader mixing uniformly, in 150 DEG C process 6 hours, join Make Composite rubber material；

The preparation method of described modified corn powder is as follows:

1) with fresh mature Semen Maydis as raw material, Semen Maydis roguing, more than 60%, is cleaned by corn content, Send into tumbler after wash clean and carry out tumbling process, during tumbling every 5-8 minute evacuation once, take out every time Tumbling 5-10 minute, then vacuum pumping after complete vacuum, so circulation 2-4 time；

2) Semen Maydis after tumbling is squeezed the juice, collect corn juice；

3) corn juice is spray-dried, then grinds in powder；Above-mentioned spray drying is very Carrying out under Altitude, temperature controls at 20-35 DEG C.

2. prepare the method for food packaging environment-friendlythin thin film described in claim 1 for one kind, it is characterised in that Step is as follows:

1) respectively composition outer layer and the HOPP in middle level, COPP are carried out mixing, formed all Poly-polypropylene layer material and COPP layer material；

2) HOPP layer material, COPP layer material and Composite rubber material are carried out through T-shaped die head Extrusion；

3) the most cooled roller of thin film after extrusion cools down, draws at stretching, thickness measure, surface corona Reason, trimming, winding film forming, check, put in storage.