METHOD OF MOULDING COMPONENTS FROM POLYMER COMPOSITE MATERIALS WITH APPLICATION OF DOUBLE VACUUM PACK Russian patent published in 2016 - IPC B29C45/02 B29C43/56 B29C70/44 B29C70/36 B29L9/00 

FIELD: chemistry.

SUBSTANCE: method moulding components from polymer composite materials with application of double vacuum pack by invention relates to category of processes of resin transfer moulding (RTM), in particular to processes of soaking with liquid binding agent by means of vacuum (VaRTM). Invention can be applied in modern field of machine building, in particular in aircraft industry, in the processes of moulding of large-sized panels of bypass-forming aggregates from polymeric composite materials (PCM). Technical result of claimed invention consists in transfer moulding of components from PCM, which ensures increase of product quality and extension of technological abilities of this method due to application of double vacuum pack, and excludes appearance of pores because of residual air inclusions in preform. Method of moulding components from polymer composite materials includes placement of preform rigging with hermetic sealing of internal vacuum pack, hermetic fastening of external vacuum pack, vacuum is created and supported in both packs, components are soaked and moulded. Under the internal pack vacuum is set at maximal level (not lower than -0.98 bar), for quality soaking and more equal distribution of binding agent. Under the internal pack level of vacuum is set in the range from -0.5 bar to -0.90 bar. In the process of soaking temperature of technological rigging is smoothly increased, ensuring constant viscosity of binding agent, stabilising thereby speed of soaking. Then level of vacuum is increased under external pack to -0.98 bar. The process of gel formation of binding agent is carried out at temperature lower than temperature of complete hardening, which reduces value of volume and temperature shrinkage of binding agent.

EFFECT: vacuum level under external pack in the process of soaking is set at necessary level from condition of realisation of specified volume content of binding agent in PCM after moulding, with obtaining different volume content of binding agent and different thickness of component with the similar structure of preform.

6 dwg