Classification of plastic profile extrusion lines

The plastic profile extrusion line is mainly used for the production of plastic door and window profiles, plastic decorative panels, PVC foam profiles and other plastic products.
According to the molding state of the co-extrusion material, the process of the plastic profile extrusion production line can be divided into two types: pre-co-extrusion and post-co-extrusion. The former co-extrusion means that two materials are compounded in the process of not being completely formed; the post-co-extrusion means that one material is completely formed, and then it is compounded with another material. The advantage of post-coextrusion is that it can use waste materials and is economical.

Plastic profile extrusion line processes can be divided into organic co-extrusion and inorganic co-extrusion according to different extrusion materials. Organic co-extrusion includes pre-co-extrusion of the same material (such as fine materials and mixed with recycled materials), pre-co-extrusion of different materials (such as PMMA and PVC pre-co-extrusion) and post-co-extrusion of soft and hard PVC; inorganic co-extrusion It can be divided into aluminum-plastic composite co-extrusion and steel-plastic composite co-extrusion.

This article focuses on post co-extrusion, aluminum-plastic composite profile co-extrusion, steel-plastic composite profile co-extrusion and two-color co-extrusion technology.
Compared with the traditional pre-coextrusion (FCE) technology, the post-coextrusion plastic profile extrusion process has the obvious characteristics of simple process, flexible application, low rejection rate, easy recycling, and controllable bonding strength. At present, this technology is mainly used to manufacture profiled materials for doors and windows with sealing strips.

The traditional pre-coextrusion plastic profile extrusion technology is a one-time molding technology. Two or more extruders extrude molten materials with different rheological behaviors or different colors into the same molding die. These melts flow in their respective runners in the molding die, and then merge and extrude at the die. Vacuum in the shaping sleeve, cooling and shaping.