Method of making netting by molding plastic about strand crossings
OwnerAnthony Bramleyinventor
Life of this patent
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Abstract
Netting, made by bonding together crossing strands consisting of or containing thermoplastic material by means of individually moulded masses of thermoplastic material, is given enhanced bond strength by compressing the crossing strands together within the die cavities employed for moulding the thermoplastic masses. The improvement is particularly marked in the case of netting made from braided strands, for example of nylon, and intended for use as cargo nets. The compression may be applied by a pressure member, for example a fluid-actuated piston, mounted within the die. If desired, a pair of counteracting pistons can be used. After compressing the strands, the pistons may be withdrawn before the thermoplastic material is introduced or may be forced back by the entering thermoplastic material.
Claims9
A method of making netting comprising the steps of:
- providing braided strands composed of synthetic thermoplastic fibres or filaments;
- forming a plurality of such braided strands into an array of spaced, generally parallel longitudinal strands;
- drawing further such braided strands transversely across said array of longitudinal strands at least singly to form strand crossings where respective transverse strands cross respective lontitudinal strands;
- enclosing a plurality of said strand crossings in a corresponding plurality of die cavities;
- mechanically compressing said strands together within said cavities sufficiently to laterally expand the strands at the strand crossing, by advancement of a pressure member into the die cavity and into compressively deforming relation with said crossing strands
- releasing said mechanical compression by retracting said pressure member;
- and, not earlier than said releasing, introducing thermoplastic material into said cavities to mould therein individual masses of said material bonding said strands together at said crossings.
Dependencies are inferred from the claim text.