Production Points Of Antistatic Film
DATE：2019/9/19 8:48:59 / READ： / SOURCE：This station
Production points of antistatic film
(1) Manufacture of antistatic masterbatch
Different types of internally added antistatic agents include liquid, paste, block, flake, powder, bead and other different states. Therefore, the manner in which the antistatic agent is added during the molding of the plastic greatly affects the antistatic property and the molding processability of the antistatic film.
A powdery and beaded antistatic agent can be blown into a film after being mixed with a resin. When mixing, an appropriate amount of industrial white oil may be added to adhere the antistatic agent to the surface of the pellet. However, the amount of the antistatic agent is small, and if the extrusion kneading is not uniform, the antistatic property of the film is affected, and the resistance values of the different points of the film are greatly different. Liquid, paste, block, and sheet-like antistatic agents should not be used directly after mixing with plastic. They should be formulated into a concentrated antistatic masterbatch. The masterbatch is then uniformly mixed with the base resin to form. If a color film is produced, and then a coloring masterbatch is added, a coloring agent can also be added to form a color antistatic masterbatch during the manufacture of the concentrated antistatic masterbatch; if a liquid antistatic agent is used, the liquid can be used before the masterbatch is manufactured. The antistatic agent is mixed with an appropriate amount of filler and then mixed with other materials in the formulation in proportion. In the antistatic masterbatch, the filler is generally added in an amount of from 5% to 10%. The filler is added to the masterbatch to facilitate the extrusion and mixing of the masterbatch. However, too much filler in the masterbatch reduces the transparency (increased haze) of the antistatic film.
A typical antistatic masterbatch formulation is as follows:
LDPE (melt flow rate 2-4g/1Omin) 70~90kg
Antistatic agent (Atmer 129) 10-15kg
Packing 0-10kg
The production process conditions for the manufacture of the antistatic masterbatch are similar to those of the manufactured droplet masterbatch.
(2) Use of antistatic masterbatch
Manufacturers can also choose to purchase antistatic masterbatch from the market. When purchasing antistatic masterbatch, in addition to knowing the type and content of antistatic agent in the masterbatch, the antistatic masterbatch should be tested for antistatic film properties (surface resistivity, static decay time) before final confirmation. The type of masterbatch purchased and the amount added.
Different plastic products have different types and additions of antistatic agents. When the thickness of the antistatic film is reduced, the amount of the antistatic agent is increased accordingly (Table 7-8). However, excessive addition of an antistatic agent to the film causes blooming and stickiness on the surface of the film.
The amount of the antistatic agent added was 0.2%; the thickness of the LDPE film was 0.05 mm.
Antistatic masterbatch can be used directly after mixing with plastic. If the masterbatch is not stored properly (wet, long storage period), it should be dried at 80 °C before use.
(3) Control of the production process
The antistatic film can be produced by the process conditions of the extrusion blown film method. In order to avoid inadvertent addition of antistatic masterbatch in the production process, care should be taken to check the electrostatic dispersion of the film online.
1) In the film production process, the static dispersibility or portable surface resistivity meter can be checked by the material rubbing method to check the static dispersibility of the antistatic film;
2) Antistatic film to be printed in the next process, the printing surface should be corona treated, and the surface wetting tension required for printing operations is achieved.
3) Antistatic film for bag making in the next step. At the beginning of production, the film should be welded to prevent excessive deposition of the surface of the film and reduce the weld strength of the film bag.
4) During the inflation process of the film, the degree of cooling (surface temperature) of the inner and outer walls of the bubble is not
First, the outer wall of the bubble is cooled by cold air, and the surface temperature is lower than the inner wall temperature of the bubble, which also affects the dispersion distribution of the antistatic agent inside and outside the bubble. Therefore, the electrostatic properties of the inner and outer surfaces of the antistatic film are significantly different, and attention should be paid during use: if the inner and outer cooling techniques are used when the bubble is inflated, the temperature of the inner and outer walls of the bubble tends to be improved, and the situation is improved.
5) The antistatic performance of the film is preferably measured 24 hours after the film is produced.
(1) Manufacture of antistatic masterbatch
Different types of internally added antistatic agents include liquid, paste, block, flake, powder, bead and other different states. Therefore, the manner in which the antistatic agent is added during the molding of the plastic greatly affects the antistatic property and the molding processability of the antistatic film.
A powdery and beaded antistatic agent can be blown into a film after being mixed with a resin. When mixing, an appropriate amount of industrial white oil may be added to adhere the antistatic agent to the surface of the pellet. However, the amount of the antistatic agent is small, and if the extrusion kneading is not uniform, the antistatic property of the film is affected, and the resistance values of the different points of the film are greatly different. Liquid, paste, block, and sheet-like antistatic agents should not be used directly after mixing with plastic. They should be formulated into a concentrated antistatic masterbatch. The masterbatch is then uniformly mixed with the base resin to form. If a color film is produced, and then a coloring masterbatch is added, a coloring agent can also be added to form a color antistatic masterbatch during the manufacture of the concentrated antistatic masterbatch; if a liquid antistatic agent is used, the liquid can be used before the masterbatch is manufactured. The antistatic agent is mixed with an appropriate amount of filler and then mixed with other materials in the formulation in proportion. In the antistatic masterbatch, the filler is generally added in an amount of from 5% to 10%. The filler is added to the masterbatch to facilitate the extrusion and mixing of the masterbatch. However, too much filler in the masterbatch reduces the transparency (increased haze) of the antistatic film.
A typical antistatic masterbatch formulation is as follows:
LDPE (melt flow rate 2-4g/1Omin) 70~90kg
Antistatic agent (Atmer 129) 10-15kg
Packing 0-10kg
The production process conditions for the manufacture of the antistatic masterbatch are similar to those of the manufactured droplet masterbatch.
(2) Use of antistatic masterbatch
Manufacturers can also choose to purchase antistatic masterbatch from the market. When purchasing antistatic masterbatch, in addition to knowing the type and content of antistatic agent in the masterbatch, the antistatic masterbatch should be tested for antistatic film properties (surface resistivity, static decay time) before final confirmation. The type of masterbatch purchased and the amount added.
Different plastic products have different types and additions of antistatic agents. When the thickness of the antistatic film is reduced, the amount of the antistatic agent is increased accordingly (Table 7-8). However, excessive addition of an antistatic agent to the film causes blooming and stickiness on the surface of the film.
The amount of the antistatic agent added was 0.2%; the thickness of the LDPE film was 0.05 mm.
Antistatic masterbatch can be used directly after mixing with plastic. If the masterbatch is not stored properly (wet, long storage period), it should be dried at 80 °C before use.
(3) Control of the production process
The antistatic film can be produced by the process conditions of the extrusion blown film method. In order to avoid inadvertent addition of antistatic masterbatch in the production process, care should be taken to check the electrostatic dispersion of the film online.
1) In the film production process, the static dispersibility or portable surface resistivity meter can be checked by the material rubbing method to check the static dispersibility of the antistatic film;
2) Antistatic film to be printed in the next process, the printing surface should be corona treated, and the surface wetting tension required for printing operations is achieved.
3) Antistatic film for bag making in the next step. At the beginning of production, the film should be welded to prevent excessive deposition of the surface of the film and reduce the weld strength of the film bag.
4) During the inflation process of the film, the degree of cooling (surface temperature) of the inner and outer walls of the bubble is not
First, the outer wall of the bubble is cooled by cold air, and the surface temperature is lower than the inner wall temperature of the bubble, which also affects the dispersion distribution of the antistatic agent inside and outside the bubble. Therefore, the electrostatic properties of the inner and outer surfaces of the antistatic film are significantly different, and attention should be paid during use: if the inner and outer cooling techniques are used when the bubble is inflated, the temperature of the inner and outer walls of the bubble tends to be improved, and the situation is improved.
5) The antistatic performance of the film is preferably measured 24 hours after the film is produced.
Author：admin