Faserstoff

摘要

1,054,946. Reticular films. O-B. RASMUSSEN. Sept. 2, 1963 [Sept. 7, 1962], No. 34607/63. Heading B5B. [Also in Division D1] A reticular film is derived from an oriented film of thermo-plastic material by partial splitting, has a net-like structure and comprises linear parallel stem fibres having the direction of orientation extending in a straight line along their length, and thin short branch fibres parallel to one another interconnecting adjacent stem fibres, each stem fibre side being slightly displaced transverse to the direction of orientation at each junction with a branch fibre, as a result of the branch fibres interconnecting the adjacent sides of adjacent stem fibres having been torn out from these sides (Fig. 1, not shown). The film may further comprise " third order " fibres each interconnecting a pair of adjacent branch fibres and parallel to the stem fibres. The film may be produced by compressively sandwiching an oriented film between two bands of elastic material and stretching the bands and the film at an oblique angle to the direction of orientation. The reticular film thus produced may be further stretched between two bands of elastic material in a direction parallel to the branch fibres of the reticular film to form a reticular film comprising " third order " fibres. The reticular film may be produced in a continuous manner by compressively sandwiching a continuous length of a longitudinally oriented film between the operative runs of two endless travelling bands of elastic material, passing the sandwich under pressure through the nip of a pair of nip rolls arranged at an oblique angle to the direction of travel of the bands and stretching the sandwich at right angles to the nip and thereafter releasing the film from between the bands. The reticular films of the invention are well suited for use as an unwoven textile material. a suitable number of layers being combined, for example by spot welding, until the product has the desired thickness.