High-tolerance chemical product packaging film and preparation method thereof

Abstract

The invention relates to a high-tolerance chemical product packaging film and a preparation method thereof. The preparation method comprises the following steps of 1, designing a film structure, and determining the structure of the film to be LLDPE / TIE / PA / TIE / PP; 2, preparing five layers of extruders; adding LLDPE into the extruder 1; adding TIE into the extruder 2; adding PA into the extruder 3;adding TIE into the extruder 4; and adding PP into the extruder 5; 3, arranging infrared heating rings on discharging channels of the extruders, and starting up for preheating; and 4, starting up forproduction; and enabling melt to pass through the extruders and a die head to form film bubbles, and enabling the film bubbles to pass through the infrared heating rings and a traction device to prepare a high-tolerance chemical product packaging film product. The processing technology is simple, and is easy to realize by additionally arranging the infrared heating ring on existing production equipment; the improvement is convenient and reliable; the film structure is reliable and stable; and the crystallinity of the film is good, and the corresponding chemical tolerance is better.

Description

technical field [0001] The invention relates to the technical field of packaging films, in particular to a packaging film for chemical products with high tolerance and a corresponding production method. Background technique [0002] Due to the certain corrosiveness of chemical products, when it comes to the packaging of chemical products, the packaging film used requires low cost and good tolerance. [0003] At present, PP (polypropylene) can be used as the inner layer material to make multi-layer co-extruded blown film films; however, the blown film processing of PP materials is more difficult, and PP particles have greater fluidity in the molten state, that is, PP melt strength Very low, the film bubble will be unstable when blowing the film, so it is necessary to increase the air volume of the film blowing air ring. When the melt exits the mold, the film bubble can be cooled rapidly and the stability of the film bubble can be increased, but the rapid cooling of the melt w...

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Problems solved by technology

[0003] At present, PP (polypropylene) can be used as the inner layer material to make multi-layer co-extruded blown film films; however, the blown film processing of PP materials is more difficult, and PP particles have greater fluidity in the molten state, that is, PP melt strength Very low, the film bubble will be unstable when blowing the film, so it is necessary to increase the air volume of the film blowing air ring. When the melt exits the mold, the film bubble can be cooled rapidly and the stability of the film bubble can be increased, but the rapid cooling of the melt will lead to crystallization of the material The lower the crystallinity, the lower the crystallinity will affect the molecular spacing and reduce the tolerance

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