Desmopan articles can be demolded more easily if the surface of the mold cavity is grained or sandblasted. This gives significantly better results than a smooth or polished surface. We therefore strongly recommend that the roughness should correspond to spark erosion textures 27 to 33.
Coating of mold
When demolding Desmopan® and
Texin™, a rough cavity surface is an advantage – such as a surface
that complies with VDE 3400 (Ref. 24-33). This gives the lowest
demolding forces by comparison with other types of surface
roughness or coatings.
Mold drafts should be at least 5°, particularly for components made of soft Desmopan® or Texin™ grades. (Fig.16)
For TPU, the surfaces of the ejectors should be as large as possible to avoid any deformation of the finished article (Fig. 17).
The high elasticity of Desmopan® and Texin™ allows the demolding of undercuts and hollow articles. Blow moldings can be blown off the core using compressed air (Fig. 18).