Classification of Winders by Type of Extruded Products

I Classification (Adapted by Extruded Product Type)

Winders for extruders need to be customized according to the form of extruded products (such as films, pipes, wires). Common types are as follows:

1. Film/Sheet Winder

Applicable products: Plastic films (such as PE, PVC films), sheets (such as ABS sheets), composite films, etc.

Features:

- Emphasizes tension uniformity (to avoid film wrinkling and stretching);

- Equipped with a wide-range traversing mechanism (to adapt to films of different widths);

- Some adopt "surface winding" (driving winding through pressure rollers contacting the film surface) to reduce film stretching.

Typical equipment: Dual-shaft center winder (commonly used in high-speed film production lines, supporting non-stop roll changing), surface friction winder (suitable for thick sheets).

2. Pipe/Profile Winder

Applicable products: Plastic pipes (such as PPR pipes, PE pipes), profiles (such as sealing strips, trunking).

Features:

- Needs to adapt to the rigidity of pipes (to avoid deformation and flattening during winding);

- Winding speed is relatively slow (pipes are heavy and need to maintain circular or special-shaped cross-sections);

- Some are equipped with guide wheel sets to ensure pipes do not deviate during winding.

Typical equipment: Single-shaft center winder (for small-diameter pipes), vertical winder (for large-diameter pipes with larger winding radius).

3. Wire/Filament Winder

Applicable products: Plastic filaments (such as strapping bands, filaments for woven bags), wire cores after extrusion of wire and cable insulation layers.

Features:

- High traversing precision (to avoid wire entanglement and knotting);

- Sensitive tension control (thin wires are easy to break and require low-tension winding);

- Mostly adopts "center winding" with small core diameter and high winding density.

Typical equipment: Precision traversing winder (controls traversing angle through servo motor to adapt to different wire diameters), multi-head winder (winds multiple wires simultaneously).

4. Special Product Winder

Foamed product winder: Designed for foam sheets and foamed pipes with low tension and large roll diameter to avoid extrusion deformation.

Elastomer winder: Used for products made of elastic materials such as TPU, with gentler tension control to prevent coil loosening caused by material rebound.

II. Linkage Requirements with Extruder

The winder needs to form closed-loop control with the extruder and tractor:

- Speed linkage: Winding speed = Traction speed = Extrusion speed (± slight error), with real-time adjustment of motor frequency through PLC system.

- Tension feedback: When the extrusion speed fluctuates, the winder's tension sensor immediately feeds back and quickly adjusts the winding force to avoid product stretching or accumulation.

- Roll diameter signal: The winder transmits real-time roll diameter data to the extruder to assist in adjusting the extrusion volume (especially in high-speed production).

Summary

The winder in the extruder is a key equipment to ensure continuous production and product quality. Its design must closely match the material, form and production speed of the extruded products. The core lies in stable tension and neat winding, while improving production line efficiency through automated functions (such as automatic roll changing).