US3978647A — Highly coherent and rigid synthetic multifilament…

Claim 1

Independent Claim 98 words

Highly coherent and rigid synthetic multifilamentary yarn of improved functional properties, composed of a single multifilamentary strand, comprising multiple alternate S- and Z-twist regions of irregular lengths formed by false twisting and retained successively along the yarn length, some of the component filaments of said yarn being partially fused and adhered to each other and the extent of fusing and adhesion and the number of twists of each of the regions having twists of the same direction as the twisting direction being greater than those of the regions having twists of the opposite direction to said twisting direction.

Claim 2

Dependent Claim 98 words

Highly coherent and rigid synthetic multifilamentary yarn of improved functional properties, composed of a single multifilamentary strand, comprising multiple alternate S- and Z-twist regions of irregular lengths formed by false twisting and retained successively along the yarn length, some of the component filaments of said yarn being partially fused and adhered to each other and the extent of fusing and adhesion and the number of twists of each of the regions having twists of the same direction as the twisting direction being greater than those of the regions having twists of the opposite direction to said twisting direction.

Claim 3

Dependent Claim 19 words

Highly coherent and rigid synthetic multifilamentary yarn as claimed in claim 1, wherein said yarn consists of polyester fiber.

Claim 4

Dependent Claim 52 words

Highly coherent and rigid synthetic multifilamentary yarn as claimed in claim 1, wherein said regions having twists of the same direction as the twisting direction have lengths of less than 4 milimeters while said regions having twists of the opposite direction to said twisting direction have lengths of less than 8 milimeters.

Claim 5

Dependent Claim 44 words

Highly coherent and rigid synthetic multifilamentary yarn as claimed in claim 1, wherein the number of twists of each of said regions having twists of the same direction as the twisting direction is less than the number of false twists imparted to the yarn.

Claim 6

Dependent Claim 73 words

Highly coherent and rigid synthetic multifilamentary yarn as claimed in claim 1, wherein said alternate twist regions are formed by false twisting a multifilamentary strand and concurrentry heating the same at a temperature defined in °C by the equation: ρ + 10 Δn ≦ 0.015 T - 0.800 and T ≦ 260 wherein ρ is density of the material in g/cm 3 and Δn is degree of double refraction of said material filament.

Claim 7

Dependent Claim 161 words

A process for manufacturing a synthetic multifilamentary yarn having multiple alternate S- and Z- twist regions retained successively along the yarn length, which process comprises 1. supplying the multifilament yarn to a false-twisting apparatus, 2. passing the yarn through a heating zone having a temperature defined in °C by the equation: ρ + 10 Δn ≦ 0.015 T - 0.800 and T ≦ 260 wherein ρ is density of the material in g/cm 3 and Δn is degree of double refraction of said material filament, the individual filaments of the yarn being softened and partially melted such that regions are formed wherein the filaments are intermitently fused and adhered to each other in a twisting direction, 3. passing the yarn in a heated condition through the false-twisting apparatus, whereby regions are formed after passing through the apparatus wherein the individual filaments are substantially unfused and are twisted in a direction opposite to the twisting direction, and 4. recovering the resulting yarn.

Claim 8

Dependent Claim 161 words

A process for manufacturing a synthetic multifilamentary yarn having multiple alternate S- and Z- twist regions retained successively along the yarn length, which process comprises 1. supplying the multifilament yarn to a false-twisting apparatus, 2. passing the yarn through a heating zone having a temperature defined in °C by the equation: ρ + 10 Δn ≦ 0.015 T - 0.800 and T ≦ 260 wherein ρ is density of the material in g/cm 3 and Δn is degree of double refraction of said material filament, the individual filaments of the yarn being softened and partially melted such that regions are formed wherein the filaments are intermitently fused and adhered to each other in a twisting direction, 3. passing the yarn in a heated condition through the false-twisting apparatus, whereby regions are formed after passing through the apparatus wherein the individual filaments are substantially unfused and are twisted in a direction opposite to the twisting direction, and 4. recovering the resulting yarn.

Claim 9

Dependent Claim 14 words

The process as claimed in claim 6, wherein said material filament consists of polyester.

Claim 10

Dependent Claim 19 words

The process as claimed in claim 6, further comprising concurrentry drawing said material strand while it is being twisted.

Claim 11

Dependent Claim 24 words

The process as claimed in claim 6, further comprising preliminary twisting of said material strand in a direction the same as said twisting direction.

Claim 12

Dependent Claim 23 words

The process as claimed in claim 9, wherein the number of said preliminary twists is one half or less of said twisting number.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-09-07	1980-03-08	1980-09-07	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-09-07	1984-03-08	1984-09-07	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-09-07	1988-03-08	1988-09-07	$7700.00	Window Closed / Lapsed

Highly coherent and rigid synthetic multifilamentary yarn and process for manufacturing the same

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