Thermoforming mold features

Features Processed by inj. molding, sheet extrusion, blow molding, thermoforming, film forming exc. for heat sealing and thermal processing lower CO2 and O2 permeability coeffs. than PS, comprable to PET polar material Manuf./Distrib. ABCR http //www.abcr.de,... 

Variation of wall thickness has a direct impact on the way in which rotationally molded parts are dimensioned. Since the wall section may vary and in many cases cannot accurately be predicted before a part is made, the part must be dimensioned to an external feature. If an internal dimension is required, then allowances for the upper tolerance of wall thickness variation must be made. Designers used to specifying injection molded parts with controlled surfaces both inside and outside of the part can find this difficult to deal with. However, extmsion blow-molding and twin sheet thermoforming share the same limitations and rotational molding actually maintains more uniform wall thicknesses than either one of these competitive processes. 

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