Multilayer fibre mat and process for its production
OwnerGunter H. Kissinventor
Life of this patent
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Abstract
A specially constructed multilayer fibre mat is made up of two cover layers of fibres with a high-quality thermosetting plastics impregnation and a central layer of if necessary short-fibre wood products with more particularly cheap thermoplastic bonding agent additives. In that construction and that composition the mats offer special possible applications for mouldings in the motor car industry, both as regards their manufacturing process and also the quality of the end product itself.
Claims17
A multilayer fiber mat for the eventual production of mouldings in a die by later applying pressure to the fiber mat while obtaining moulding temperature in a temperature range of from about 170.degree. to 210.degree. C. to form the moulding, the mat comprising:
- two cover layers formed of woody fibrous material and a proportion of thermosetting synthetic resin which can be pressed in the temperature range of 170.degree. to 210.degree. C., and
- a central layer sandwiched between the cover layers which is formed of woody fibrous material containing a thermoplastic bonding agent additive the resistance to oxidation of which is inadequate within said temperature range;
- said two cover layers containing about 10 to 30% of the total fibrous material of the mat with the central layer containing the remainder thereof, and
- the relatively high proportion of thermosetting resin in said cover layers compared to said central layer preventing deterioration of the thermoplastic bonding agent in said central layer during moulding,
- so that moulded mats of high quality can be produced notwithstanding the inclusion of said oxidation-sensitive thermoplastic bonding agent additive in the central layer.
Dependencies are inferred from the claim text.