A smoke film with uniform thickness

Abstract

The invention discloses a cigarette film with uniform thickness composed of three layers A, B and C, wherein the A layer includes 80-90 parts by mass of low-volatile copolymer polypropylene and 10-15 parts by mass of low-volatile slippery agent And 2-7 mass parts anti-blocking agent; B layer comprises 65-98 mass parts homopolypropylene, 1-5 mass parts antistatic agent, 0-30 mass parts stiffening agent; C layer comprises 94-97 mass parts low Volatile copolymerized polypropylene, 2-3 parts by mass of low-volatile slip agent and 1-3 parts by mass of anti-blocking agent. In the present invention, the main material copolymerized polypropylene and the slip agent in the cigarette film are modified with low volatile matter, the content of low molecular matter in the raw material is reduced after modification, and the volatile matter is less after melt extrusion, and by adding an oil fume suction device, There are few oil drop-like accumulations on the die head, no dripping on the sheet, the surface structure is complete, and there are no defects. After longitudinal and transverse stretching, the film thickness is evenly distributed. It can be detected by the inspection machine, taking the 21 micron cigarette film as an example. The thinnest area is also 20 microns, and the thickness uniformity is significantly improved.

Description

technical field [0001] A smoke film of uniform thickness. Background technique [0002] When making a cigarette film, it is necessary to say that the sheet is stretched longitudinally and transversely. In the prior art, a cigarette film with a relatively uniform thickness is usually composed of three layers A, B, and C. Among them, the A layer includes 80-90 parts by mass of copolymerized polypropylene, 10-15 parts by mass of slippery agent and 2-7 parts by mass of antiblocking agent; B layer includes 65-98 parts by mass of homopolypropylene, 1-5 parts by mass of antistatic agent, 0 - 30 parts by mass of stiffening agent; layer C includes 94-97 parts by mass of copolymerized polypropylene, 2-3 parts by mass of smooth agent and 1-3 parts by mass of anti-blocking agent. After melt extrusion, there are many volatiles, and the hot and cold intersection of the die accumulates in the shape of oil droplets, which drip onto the molten sheet, causing damage to the surface structure ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the thickness of the cigarette film is not uniform, and the block and strip-shaped areas on the film become thinner, and provide a smoke film with uniform thickness and its preparation process