Woven webbing structure

A vehicle occupant restraining woven webbing structure for use in a safety restraint belt device, the webbing structure comprising:

• (a) groups of first and second side yarns having an extensional rigidity and oriented along the length of said webbing structure;
• (b) a longitudinally oriented yarn located along a core of said webbing structure and centrally disposed between each group of first and second side yarns, the core-located longitudinal yarn being formed from a plurality of yarns twisted around one another, wherein the core-located longitudinal yarn has an extensional rigidity different from the first yarns;
• and
• (c) crosswise strands transverse to said first and second side yarns and said longitudinal yarn, wherein said longitudinally oriented core-located yarn is inserted among said crosswise strands and said first and second side yarns are interwoven with said crosswise strands,
• wherein each core-located longitudinal yarn includes a plurality of a first type of yarns twisted around one another, and a second type of yarn, having a smaller diameter than the first type of yarn, twisted around the plurality of the first type of yarns.

A method of forming a safety restraint belt from a woven webbing structure, the method comprising the steps of:

• (a) forming groups of first and second side yarns having an extensional rigidity along a length of said belt;
• (b) forming a longitudinally oriented core-located yarn centrally disposed between each group of first and second side yarns, the core-located longitudinal yarn being formed by twisting a plurality of yarns around one another, wherein the core-located longitudinal yarn has an extensional rigidity different from the first yarns;
• and
• (c) transversely interweaving crosswise strands only among said first and second side yarns such that said longitudinal yarn is inserted within the webbing structure,
• wherein the step of forming a longitudinally oriented core-located yarn further includes twisting another yarn around said plurality of twisted yarns, wherein said another yarn has a smaller diameter than the yarns forming said plurality of yarns.

A vehicle occupant restraining webbing structure comprising warps along a longitudinal direction of the webbing, and wefts interwoven along a transverse direction with respect to the warps,

• wherein the warps include first and second types of warps, the first and second types of warps having different extensional rigidities from one another, said first type of warps being inserted among said wefts, said second type of warps being interwoven with said wefts;
• wherein the first type of warps have a preselected number of twists per meter and an extensional rigidity greater than the second type of warps;
• wherein T is a number of twists per meter, D is a number of denier of the first type of warps, and K is a twist coefficient defined by K=T D, and the twist coefficient, K, for the first type of warps is at least 1200, and
• wherein the first type of warps include a larger diameter and a smaller diameter warp.