Surface roughness is a factor that affects the mechanical and physical features of the part considerably. Abrasive materials appropriate for obtaining the desired surface structure of the coated parts should be selected and applied. In this way, the features such as friction, abrasion, tightness, metal fatigue, surface adhesion, electrical and thermal contact and brightness can be obtained.
Surface Roughness (Ra) of critical parts required by each industry varies according to their requirements.
Especially in case of the production of glassware, fasults that occur due the roughness of plungers cause the crack of final product. The only way to prevent any rise in operational costs and plungers featuring minimun surface roughness. On the surfaces of Ni, Co, WC coated (hardness at 40-62Hrc) plungers which glass contacts, a very low surface roughness up to 0,04 pm is obtained.The Ra values obtained ensure the fault-free production of the final
product.
On the other hand, in textile industry, surface roughness value depends on the threading conditions according to the features of final product. For example, acrylic thread producers prduce bright surfaced threads in their production systems, using godets with low surface roughness, grooved cylinders, drawing and stretching Seydel Cylinders. The goal here is to cause acrylic thread to slip, without being caught to obtain a bright and smooth final product.
On the contrary, polypropylene producers prefer rough surface with a higher Ra value. Kobatek is able to obtain both high quality ceremic-coated surfaces like 0,05 um for acrylic thread producers and other surfaces with roughness values (max 3,8 um) for polypropylene thread producers.
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