Process of plastics extrusion
In extrusion process, molten material passes through a die that forms a continuous straight profile which is cooled and solidified. Usually, this process is cost-effective for simple profiles and for high volume of production.
The principal advantage of this process is that is possible create long length parts. Another one is that is possible manufacture pipes with integrated coupler including rubber seal.
On the downside say that the plastic does not dissipate heat as well as metals so water baths or cooling rolls are required to achieve a correct cooling rate.
The more common polymers extrusion processes are:
Gestión de Compras has extensive experience in the design, development and manufacture plastic parts and profiles by extrusion. We work with a wide range of materials and processes. Thus we offer to ours customers their desired parts with high quality and with the most competitive prices.
Materials and products
There are a lot of plastic available for extrusion:
- Polyethylene (PE)
- Polypropylene (PP)
- Polystyrene (PS)
- High impact polystyrene (HIPS)
- Polymethyl methacrylate (PMMA)
There is a huge range of plastic parts made by extrusion as pipes, fences, windows frames and profiles, adhesive tapes, wire insulation, automotive interiors, shopping bags, wrapping materials, sheets… and it is widely used in packing, construction, decoration, automotive, technical textiles…
Tolerances for plastic extrusions differ widely from those of metal extrusions. It is because metals harden quickly, they typically hold tighter tolerances than extrusions made of plastic materials. Obtain tight tolerances on extruded plastic parts is much difficult that are usually, based upon the raw materials used, the complexity of the part, and the tooling that is made to produce the part. Some materials, such as PVC, cool more efficiently obtaining thus better tolerances that other which hold onto heat, such as polypropylene.
Standard and certificates
Gestión de Compras only works with companies that can provide us warranties, which are holders of all necessary quality certificates and work according to specific industry standards such as:
- ISO9001 e ISO 14001.
- ISO 8062, ISO 286-2, DIN 2768, etc.
Standards according to extruded materials:
- 19069 para el polipropileno (PP)
- 16396 para poliamidas (PA)
- 1622 para poliestireno (PS)
- 2580 para ABS
- 4894 para SAN
- 7391 para policarbonato (PC)
- 17855 para polietileno (PE)
- 8257 para polimetilmetacrilato (PMMA)
- 15013 para la producción de láminas de polipropileno (PP)