Powder sintering

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Powder sintering ( English powder slush or slush molding ) is in the plastic processing a master mold process for manufacturing z of. B. door panels , dashboards or other surfaces that are mainly used in the vehicle interior, made of plastic powder . The result is a visually and haptically appealing surface, since different grains (geometric, leather-like) can be introduced into the tool.

The raw material PVC or thermoplastic elastomers , for example urethane-based (TPU), more rarely olefin (TPO) or polyester-based (TPEE), occurs either as a powder or as plastisol .

process

The successive processes are:

  1. Heating up a tool (mostly made of nickel for series production , but also aluminum )
  2. Bringing the hot tool together with the plastic powder that adheres to the tool wall and sintered on.
  3. Rotate and tilt the tool to produce an evenly thick film or skin. The average thickness is 1.0 mm to 1.2 mm, but can also be up to 3 mm in corners and radii.
  4. Pour out the excess powder.
  5. Heat to 155–170 ° C to completely gel the adhering powder. The rear side is homogenized in order to obtain a uniform surface.
  6. Cooling the tool to remove the product.

In contrast to the rotary process, a hollow body is not produced here, but a thick-walled "film" that has the shape of the tool. The production time for single hides is also significantly shorter with less than 10 minutes and is therefore also suitable for series production. Using multiple tools, up to 8 components can be produced at the same time (e.g. glove box lid).

Investments

The construction of a slush system can mainly be divided into 2 types:

  • Air-heated systems: The tool is heated to up to 300 ° C in a convection oven (similar to an oven ). The cooling takes place via supplied cold air or by immersion or spraying with water.
  • Heated oil plants: On the back of the tool are pipes , ver welded , through which hot oil to warm up cold oil or runs to cool.

PVC skin manufacturer

Well-known automotive suppliers who use these slush processes are e.g. B. Faurecia , Magna International , Johnson Controls (JCI), Samvardhana Motherson Peguform and many more.

Web links

literature

  • Gerhard W. Becker, Dietrich Braun: Polyurethanes. 3rd edition, Hanser Verlag, 1993, ISBN 3-446-16263-1 (editor Günther Oertel: Kunststoffhandbuch 7th ).
  • Hans-Georg Elias: Macromolecules: Volume 3: Industrial Polymers and Syntheses . John Wiley & Sons, 2009, ISBN 3-527-62654-9 ( limited preview in Google Book Search).

credentials

  1. ↑ YES Brydson: Plastics Materials . Elsevier, 2013, ISBN 1-4832-9209-6 ( limited preview in Google Book Search).