Extrusion machine configuration


A safety tube (or disk) is installed at the discharge end of the barrel. If the pressure inside the barrel increases to an unsafe limit, the safety tube will break. A fracture pressure of about 50,000 kPa, which is 75% of the design limit, is typically used. A pressure sensor with an indicator is also provided to indicate the actual pressure condition of the screw discharge port. An adjustable shutdown and alarm switch is sometimes provided as an added safety device.
The barrel of the plastic extruder must be heated at startup to re-melt the polymer remaining in the machine during shutdown and maintain the temperature of the inner surface of the barrel at a level to maintain or actually heat the resin during operation. Due to the external heating provided by the barrel heating device, the efficiency is low, and it is better to use the screw shear heat provided by the driving power to increase as much heat as possible.
From the feed zone to the discharge, if the screw is performing the required adiabatic operation, the required barrel temperature profile is a configuration that gradually increases the set point so that each point along the screw is at the desired resin temperature. . It is therefore preferred to divide the heating zone into several heating zones. For 30:1 (L/D), the extruder is generally divided into six zones.

  • 09/10/2018
  • Recently
Click here to view Previous or Next

Related News

Casting PA film and production technology

Casting PA film and production technology

  • 21/12/2017 09:33:12

Casting PA film and production technology 1. Casting PA film and its raw materials used: PA film has the advantages of high strength, good toughness, good transparency, good heat resistance and cold…

Read more

Cast film mechanical winding device

Cast film mechanical winding device

  • 19/12/2017 09:21:48

Cast film mechanical winding device Corona treatment device: cast film after corona treatment, can improve the surface tension of the film to improve the printing of the film and together with other…

Read more

Downstream production line auxiliaries

Downstream production line auxiliaries

  • 18/12/2017 09:42:18

Downstream production line auxiliaries Thickness measurement device: In the high-speed continuous production process, cast film thickness measurement must be non-contact automatic tracking. Most o…

Read more

Casting film production line in the cooling device

Casting film production line in the cooling device

  • 15/12/2017 10:03:16

Casting film production line in the cooling device Casting production line in the cooling device mainly by the rack, cooling roller, peel roller, refrigeration system and air knife, auxiliary device…

Read more

Hot News

Removal of excess resin

Removal of excess resin

There are two main methods for removing excess resin from the surface of the web: the doctor blade and the squeeze roller. The scraper can be as simple as a pair of angle irons arranged to contact the web. Usually they are mounted on a common rotatable su

Dipping machine

Dipping machine

Plastic laminates are manufactured industrially, and the web is impregnated in a machine called a dipper or a dipper. It includes a paper roll unwinding device, a resin tank, a facility for removing excess resin, a drying chamber for evaporating most of t

Saturated impregnation and infiltration process

Saturated impregnation and infiltration process

The analysis of the addition of the resin to the paper web in the plastic laminate is based on the assumption that the two processes that occur are simultaneous and sequential. First, the so-called saturated impregnation is the rapid absorption of the res

Laminate pore size distribution

Laminate pore size distribution

In the early 1960s, many laminates used the properties of this paper to estimate the amount of resin they absorbed. They used a thin resin solution to fill all the voids of the paper with the resin solution and scrape off the excess solution. As long as t

Laminate paper handling

Laminate paper handling

The resin and the cellulose fibers are thoroughly mixed to obtain a laminate, and the web is usually immersed in a resin solution. The surface tension causes the web to absorb the resin solution and fill the porous structure of the entire paper. The exces

Tags