This invention relates to polyvinyl alcohol fibers, methods of making polyvinyl alcohol fibers and products manufactured from polyvinyl alcohol fibers. The invention relates particularly but not exclusively to products comprising non-woven polyvinyl alcohol fibers, methods of making non-woven polyvinyl alcohol fibers and products incorporating such fibers.

This invention relates to polyvinyl alcohol fibers, methods of making polyvinyl alcohol fibers and products manufactured from polyvinyl alcohol fibers. The invention relates particularly but not exclusively to products comprising spunbond polyvinyl alcohol fibers, methods of making spunbond polyvinyl alcohol fibers and products incorporating such fibers.

This invention relates to polyvinyl alcohol fibers, methods of making polyvinyl alcohol fibers and products manufactured from polyvinyl alcohol fibers. The invention relates particularly but not exclusively to products comprising extruded polyvinyl alcohol fibers, methods of making extruded polyvinyl alcohol fibers and products incorporating such fibers.

The present invention is to provide a fiber for artificial hair which can freely change the hairstyle at home while maintaining the wave shape of the fiber.

A fiber for artificial hair having a bending rigidity maintaining ratio defined by formula (1) is 40 to 80% and a heat shrinkage ratio defined by formula (2) is 0.0 to 5.0% is provided.

bending rigidity maintaining ratio (%)=100{(bending rigidity in a state after conditioning for 24 hours at 30 C.90% RH)/(bending rigidity in a state after conditioning for 24 hours at 23 C.50% RH)}(1)

heat shrinkage ratio (%)=100{(length before heat treatment)(length after heat treatment for 5 min at 155 C.)}/(length before heat treatment)(2).

A method for forming a filter rod may include providing a bale of crimped tow band having about 10 denier per filament or greater and about 20,000 total denier or less, the crimped tow band comprising a plurality of cellulose acetate filaments; and placing the crimped tow band in an apparatus so as to form a filter rod.

A method for forming a filter rod may include providing a bale of crimped tow band having about 10 denier per filament or greater and about 20,000 total denier or less, the crimped tow band comprising a plurality of cellulose acetate filaments; and placing the crimped tow band in an apparatus so as to form a filter rod.

A spiral yarn structure includes a core yarn comprising at least one core filament which is a filament fiber of 5-25D, a cover yarn comprising a plurality of cover fibers formed by stretching roves having a count ranging from 0.5 Ne to 2.0 Ne, wherein the cover fibers encloses the core yarn, and a wrap yarn wrapping the cover yarn at a twist factor K3, wherein the wrap yarn comprises at least one wrap filament which is a filament fiber of 5-25D, and the at least one wrap filament wraps an outer side of the cover yarn at an inclined angle to form the spiral yarn structure having a count ranging from 40 Ne to 80 Ne.

A spiral yarn structure includes a core yarn comprising at least one core filament which is a filament fiber of 5-25D, a cover yarn comprising a plurality of cover fibers formed by stretching roves having a count ranging from 0.5 Ne to 2.0 Ne, wherein the cover fibers encloses the core yarn, and a wrap yarn wrapping the cover yarn at a twist factor K3, wherein the wrap yarn comprises at least one wrap filament which is a filament fiber of 5-25D, and the at least one wrap filament wraps an outer side of the cover yarn at an inclined angle to form the spiral yarn structure having a count ranging from 40 Ne to 80 Ne.

Hollow-fibre membrane having at least one first curl in the form of a first wave which is characterized by a first oscillation plane and a first wavelength and at least one second curl in the form of a second wave which is characterized by a second oscillation plane and a second wavelength, characterized in that the first oscillation plane and the second oscillation plane confine an angle with one another which is different from zero.

Provided is a crimped fiber constituted of the following first component and second component, wherein the first component is a propylene-based resin composition containing a propylene-based polymer (1-A) in which a melting point (TmD) obtained under a specified condition exceeds 120 C. and a propylene-based polymer (1-B) satisfying the conditions that (a) a weight average molecular weight (Mw) is 10,000 to 200,000, (b) a molecular weight distribution (Mw/Mn) is less than 4.0, and (c) a melting point (TmD) obtained under a specified condition is 0 to 120 C.; and the second component is a propylene-based polymer (2) in which a melt flow rate (MFR) under the foregoing measurement condition is 1 g/10 min or more and 2,000 g/10 min or less, and a melting point (TmD) observed under the foregoing measurement condition by using a differential scanning calorimeter (DSC) exceeds 120 C., or a propylene-based resin composition containing the propylene-based polymer (2).