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A multi-layer co-extrusion and casting film technology, which is applied in the direction of lamination, layered products, lamination devices, etc., can solve the problems of high bonding degree of sealing film and packaging box, damage of sealing film, generation of water vapor, etc.
Active Publication Date: 2015-12-23
中塑新材料科技(杭州)有限公司
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Problems solved by technology
[0004] In the prior art, when it is used to package food, especially fresh fruit, since the pulp cells of the fruit are still respiration, water vapor will be generated in the package, which will affect the light transmittance and aesthetics
At the same time, when people need to take out food, they often choose to pierce the sealing film on the packaging box instead of tearing the sealing film on the packaging box, which causes the damage of the sealing film and cannot be reused.
The reason is that the sealing film and the packaging box are highly bonded, and it is far more difficult for people to tear off the sealing film on the packaging box than to pierce the sealing film on the packaging box.
Method used
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Embodiment 1
[0040] (1) In parts by weight, take 30 parts of hydrogenated C5 petroleum resin and add it into a reactor whose temperature is controlled at 120° C. After the material is melted, add 15 parts of paraffin, and control the rotating speed at 150 rad / min to start stirring until the sample is completely melted;
[0041] (2) Raise the temperature to 160°C, continue to stir for 0.5h, and then evenly add EVA resin to the reactor several times within 1.5h;
[0042] (3) Add calcium carbonate, control the rotation speed to 200rad / min, stir at a constant speed until uniform, and glue comes out.
Embodiment 2
[0044] (1) In parts by weight, take 35 parts of hydrogenated C5 petroleum resin and add it into a reactor whose temperature is controlled at 120° C. After the material is melted, add 7 parts of paraffin, and control the rotating speed at 100 rad / min to start stirring until the sample is completely melted;
[0045] (2) Raise the temperature to 160°C, continue stirring for 1 hour, and then evenly add EVA resin to the reactor several times within 1.5 hours;
[0046] (3) Add calcium carbonate, control the speed to 100rad / min, stir at a constant speed until uniform, and glue comes out.
Embodiment 3
[0048] (1) In parts by weight, take 40 parts of hydrogenated C5 petroleum resin and add it into a reactor whose temperature is controlled at 120° C. After the material is melted, add 10 parts of paraffin, and control the speed of rotation at 125 rad / min to start stirring until the sample is completely melted;
[0049] (2) Raise the temperature to 160°C, continue stirring for 1 hour, and then evenly add EVA resin to the reactor several times within 1.5 hours;
[0050] (iii) Add calcium carbonate, control the rotating speed to 125rad / min, stir at a constant speed until uniform, and glue comes out.
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Abstract
The invention discloses a multi-layer coextrusion cast film which is formed by 11 layers of resin beds has the structure expression as follows: N1/B1/C/N2/D1/N3/D2/N4/A/N5/B2, wherein A is anticorrosive coating, B1 and B2 are sealing layers, C is an anti-fracture layer, D1 and D2 are compression resistant layers, N1, N2, N3, N4 and N5 are glue adhering layers, A is polypropylene, B1 and B2 are ethylene-vinyl alcohol copolymers, C is polyamide, D1 and D2 are polyethylene glycol terephthalate, and N1, N2, N3, N4 and N5 are EVA hot melt glue. The multi-layer coextrusion cast film has the beneficial effects that while the sealing state is guaranteed, a sealing film is tightly laminated with a packaging box so as to prevent air from entering; while content in the packaging box needs to be taken out, the sealing film can be conveniently torn from the packaging box without causing breaking of the sealing film, and no residue of the sealing film exists at the original adhesion part of the sealing film and the packaging box. Meanwhile, the sealing film has an anti-fogging function, so that the packaging box has good light transmission property and attractiveness.
Description
technical field [0001] The present invention relates to a film, and more particularly to a multilayer coextruded cast film. Background technique [0002] The extrusion casting process has the advantages of fast production speed, low cost, high output, etc., and the produced film has many advantages such as good surface performance, good transparency, good gloss, and uniform thickness. At the same time, post-treatment of the film such as corona, Printing and other processes are simple, because it is widely used in various industries such as textile products, food, daily necessities, medical supplies and flower packaging. [0003] There are many varieties of cast film, which can be divided into single-layer film and multi-layer film according to their structure. With the continuous development of the food packaging industry, the performance requirements of packaging materials are getting higher and higher, which makes the market demand for multilayer films continue to increas...
Claims
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Application Information
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