Material sheet and process for its preparation
AssigneeDsm IP Assets B.V.
InventorsReinard Jozef Maria Steeman, Marcel Jongedijk, Johann Van Elburg
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Abstract
A material sheet is formed of a woven fabric of polymer tapes, wherein the width of a tape varies less than 2% on average in the longitudinal direction of the tape. Processes for the preparation of the material sheet, and to a ballistic resistant article comprising the material sheet are also provided. A ballistic resistant article which includes the material sheet exhibits excellent antiballistic properties.
Claims22
A process for preparing a polymeric tape product having a width that varies less than 2% on average in a longitudinal direction thereof, the process comprising:
- (a) forming a polymeric powder bed on a belt provided with at least two parallel compressible bordering strips such that the powder bed extends between the strips and overlaps the strips so as to define in the powder bed an in-boundary powder bed part and out-of-boundary powder bed part, respectively,
- (b) compression-moulding the in-boundary and out-of-boundary powder bed parts of the polymeric powder bed at a temperature below the melting point of the polymeric powder so as to form a compression molded polymeric tape comprised of a compressed in-boundary polymeric tape part corresponding to the in-boundary powder bed part and a compressed out-of-boundary polymeric tape part corresponding to the out-of-boundary powder bed part;
- and thereafter
- (c) separating the compressed in-boundary and out-of-boundary polymeric tape parts to thereby provide a polymeric tape product from the compressed in-boundary polymeric tape part.
A process for making a polymeric tape product comprising:
- (a) providing a belt with at least two parallel compressible bordering tubes that define an inner belt portion and an outer belt portion;
- (b) forming a polymeric powder bed onto both the inner and outer belt portions so that the powder bed extends between and overlaps the bordering tubes to thereby establish an in-boundary powder bed part and an out-of-boundary powder bed part, respectively,
- (c) compression-molding the polymeric powder bed so as to form a compression molded polymeric tape having in-boundary and out-of-boundary compression molded polymeric tape parts corresponding to the in-boundary and out-of-boundary polymeric powder bed parts, respectively;
- and thereafter
- (c) separating the in-boundary and out-of-boundary compression molded polymeric tape parts so as to provide a polymeric tape product from the in-boundary compression molded polymeric tape part.
Dependencies are inferred from the claim text.