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Anti-fog film and preparation technology thereof

A film and anti-fog technology, applied in the direction of lamination, packaging item types, special packaging items, etc., can solve the problems of affecting the appearance of packaging, discoloration of fresh fruits and vegetables, rot and deterioration, etc., to avoid discoloration and even rot and deterioration, and improve visual effects. Effect

Inactive Publication Date: 2016-05-11
DONGGUAN HUAYU PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the film used for food and vegetable packaging in the market is susceptible to drastic changes in temperature and humidity and the evaporation of moisture contained in the packaged items, and it is easy to form fog on the surface of the film.
The formed mist will affect the appearance of the packaging and then affect the value of the product, and the falling water droplets will cause discoloration and even rot of fresh fruits and vegetables

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Ingredients: 967g polypropylene and 33g anti-sticking agent for the upper surface layer and lower surface layer, 475g metallocene low-density polyethylene resin, 475g low-density polyethylene resin and 50g blocking agent for the middle layer. Wherein, the polypropylene uses 5C37F resin, the anti-sticking agent uses AF1088 resin; the metallocene low-density polyethylene resin uses 2045G resin, the low-density polyethylene resin uses 4203 resin, and the anti-blocking agent uses AF1088 resin .

[0018] The ingredients of the middle layer are heated to a molten state in the main extruder, and the upper surface layer and the lower surface layer are heated to a molten state in two auxiliary extruders respectively. , the extrusion temperature is 170-195°C, and the extrusion frequency is 31.5-32.5HZ. After preheating the cooled thick sheet, longitudinally stretch 3.8 times at 100-116°C to obtain a thin sheet; after preheating the longitudinally stretched sheet, transversely st...

Embodiment 2

[0020] Ingredients: 950g polypropylene and 50g anti-sticking agent for the upper and lower surface layers, 465g metallocene low-density polyethylene resin, 465g low-density polyethylene resin and 70g blocking agent for the middle layer. Wherein, the polypropylene uses 5C37F resin, the anti-sticking agent uses AF1088 resin; the metallocene low-density polyethylene resin uses 2045G resin, the low-density polyethylene resin uses 4203 resin, and the anti-blocking agent uses AF1088 resin .

[0021] The ingredients of the middle layer are heated to a molten state in the main extruder, and the upper surface layer and the lower surface layer are heated to a molten state in two auxiliary extruders respectively. , the extrusion temperature is 160-190°C, and the extrusion frequency is 25-40HZ. After preheating the cooled thick sheet, longitudinally stretch 3.5 times at 100-116°C to obtain a thin sheet; after preheating the longitudinally stretched sheet, transversely stretch 3.8 times a...

Embodiment 3

[0023] Ingredients: 990g polypropylene and 10g anti-sticking agent for the upper surface layer and lower surface layer, 485g metallocene low-density polyethylene resin, 485g low-density polyethylene resin and 30g blocking agent for the middle layer. Wherein, the polypropylene uses 5C37F resin, the anti-sticking agent uses AF1088 resin; the metallocene low-density polyethylene resin uses 2045G resin, the low-density polyethylene resin uses 4203 resin, and the anti-blocking agent uses AF1088 resin .

[0024] Put the above ingredients into the extruder, extrude the film under the condition that the extrusion temperature is 180-210°C and the extrusion frequency is 30-50HZ, after cooling, stretching and corona steps, the pulling speed is Traction is carried out under the condition of 65M / min, and the anti-fog film is finally wound up.

[0025] The ingredients of the middle layer are heated to a molten state in the main extruder, and the upper surface layer and the lower surface la...

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Abstract

The invention discloses an anti-fog film, which is composed of an upper surface layer, a middle layer, and a lower surface layer. The upper surface layer and the lower surface layer are both composed of 95 to 99 wt% of polypropylene and 1 to 5 wt% of anti-sticking agent, and the middle layer is composed of 46.5 to 48.5 wt% of metallocene low density polyethylene resin, 46.5 to 48.5 wt% of low density polyethylene resin, and 3 to 7% of anti-blocking agent. The provided film has an anti-fog function, can prevent forming fog on the surface of the film, and improves the visual effect of commodities. At the same time, the phenomenon that the color of fresh vegetables and fruits changes or fresh vegetables and fruits even go bad due to the water drops from the film is avoided. The film can be used to pack foodstuff, such as vegetables, fruits, sushi, meat, and the like, and flowers.

Description

technical field [0001] The invention relates to the field of film materials, in particular to an anti-fog film and a preparation process thereof. Background technique [0002] At present, the films used for food and vegetable packaging on the market are susceptible to drastic changes in temperature and humidity and the evaporation of moisture contained in the packaged items, and it is easy to form fog on the surface of the film. The formed mist will affect the appearance of the packaging and then affect the value of the commodity, and the falling water droplets will cause discoloration and even rot of fresh fruits and vegetables. Therefore, there is a need for a film with anti-fog properties. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a film with anti-fog performance and its preparation process based on the above-mentioned deficiencies in the prior art. [0004] Technical scheme of the present invention is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/18B32B7/12B32B37/06B32B37/15
CPCB32B27/32B32B7/12B32B27/18B32B37/06B32B37/15B32B2439/70
Inventor 马莉娜
Owner DONGGUAN HUAYU PACKING
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