Norm

NEN-EN-ISO 294-5:2018 en

Kunststoffen - Het spuitgieten van proefstukken van thermoplastische materialen - Deel 5: Voorbereiding van standaard proefstukken voor de bepaling van de anisotropie

52,53 63,56 Incl BTW

Over deze norm

Status Definitief
Aantal pagina's 7
Commissie Kunststoffen
Gepubliceerd op 01-01-2018
Taal Engels
NEN-EN-ISO 294-5 specifies a mould (designated the type F ISO mould) for the injection moulding of plates with a preferred size of 80 mm × 120 mm and a minimum size of 80 mm × ≥90 mm and with a preferred thickness of 2 mm for single-point and multi-point data acquisition. It has been found to provide the maximum anisotropic properties, with only a slight sensitivity to the rate of injection. Whenever possible, a two cavity mould is intended to be used. For the design of plastic parts, this will provide upper and lower bounds for the tensile properties. Matching the plate thickness to a given part thickness is not a suitable criterion because of the effect of mould filling rate and part geometry on anisotropy. Investigation of the anisotropy of materials is a special procedure intended to provide guidance in the design of mouldings for end-use applications and is not intended as a quality control tool. In the injection moulding of thermoplastic materials, the flow of molten polymer can influence the orientation of fillers such as fibreglass or the orientation of polymer chains, resulting in anisotropic behaviour. For the purposes of this document, the flow direction is defined as the direction from the gate to the far end of the mould cavity and the cross direction as the direction perpendicular to the flow direction. The type F mould is not intended to replace the type D mould used to determine the moulding shrinkage of thermoplastics.

Details

ICS-code 83.080.20
Nederlandse titel Kunststoffen - Het spuitgieten van proefstukken van thermoplastische materialen - Deel 5: Voorbereiding van standaard proefstukken voor de bepaling van de anisotropie
Engelse titel Plastics - Injection moulding of test specimens of thermoplastic materials - Part 5: Preparation of standard specimens for investigating anisotropy
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