A composite crimped yarn comprising: at least two kinds of multifilament yarns, one of them being comprised of a crimped conjugate multifilament yarn comprising two kinds of polyester polymers different from each other in the heat shrinkability and positioned as a major component of the inner layer of the composite crimped yarn, the other of them being comprised of a crimped multifilament yarn of a single synthetic polymer and positioned as a major component in the outer layer of the composite crimped yarn. In the above, the length of the crimped multifilament yarn is 5 to 35% larger than that of the crimped conjugate multifilament yarn, part of the crimped multifilament yarn being migrated to the crimped conjugate multifilament yarn disposed in the inner layer and part of the crimped conjugate multifilament yarn being migrated to the crimped multifilament yarn disposed in the outer layer.
This is a division of application Ser. No. 08/192,743 filed Feb. 7, 1994 U.S. Pat. No. 5,422,171; which is a division of 07/951,998 filed Sept. 24, 1992 U.S. Pat. No. 5,307,614.
Priority Data
Sep 26, 1991 [JP] 3-246393 Mar 02, 1992 [JP] 4-044946
Crimped yarns that comprise a conjugate multifilament yarn having unique surface texture, dry touch, and stretchability; woven/knitted products comprising said crimped yarn; and production methods of crimped yarn as a conjugate multifilament yarn comprising polyester polymer components and has (a) number of crimps (CA): 2.5 crests/cm.ltoreq.CA.ltoreq.10 crests/cm, (b) number of developed crimps (CB): 8 crests/cm.ltoreq.CB.ltoreq.30 crests/cm, (c) shrinkage stress (TS): 0.0882.ltoreq.TS (cN/dtex).ltoreq.0.221, (d) apparent shrinkage percentage (SC): 40%.ltoreq.SC.ltoreq.80%, and (e) shrinkage percentage of fiber in boiling water (SW): 2%.ltoreq.SW.ltoreq.8%, and produced by subjecting a crimp-forming conjugate multifilament yarn to relaxation-heat treatment.
A false twist yam including synthetic fiber yam having elongation, crimp rigidity, crimp appearance stretch ratio, dry heat shrinkage stress maximum value, deformation degree of single filament and entanglement number in specific ranges respectively. The yam has good drape properties, soft feeling, bulkiness, and flexibility as well as puff properties, mild luster, and pliable dry feeling. From the yam, woven or knit fabrics having novel texture that cannot be achieved in woven or knit fabrics produced from conventional drawn or false twist yams. The false twist yam is produced in a drawing and false twisting process.
A method of making yarn comprises feeding at least two drawn, continuous filament starting yarns (18, 19), of which at least one is a multifilament yarn, together to an intermingling device (21) to form a single bulked thread of which the filaments of the starting yarns are intermingled and looped, and applying a bulk-reducing treatment to the bulked thread (27), characterized in that the starting yarns are fed to the intermingling device with substantially equal overfeed.
The low-shrinkage hybrid yarns comprise reinforcing filaments and matrix filaments composed of thermoplastic polymers having a lower melting point than the melting or decomposition point of the reinforcing filaments. The yarns are characterized by a 160.degree. C. hot air shrinkage of not more than 2% and a 200.degree. C. hot air shrinkage of not more than 5%. A process for producing these hybrid yarns includes the steps of feeding yarn strands moving at different speeds into an entangling jet, heating a matrix feed yarn during the feeding thereof into the entangling jet, entangling the feed yarn strands, and taking off the strands with or without shrinkage and additional heating.
There is provided a loop fastening material for engaging a suitable male mechanical fastening element for a backing substrate of an oriented sheet material having a first face and a second face and substantially continuously attached to at least the first face a plurality of discrete, multi-filament transversely expanded yarns, such yarn filaments providing open loop structures. The yarns are expanded by transverse orientation of the backing to which it has been previously attached by extrusion bonding, adhesive bonding or the like. The resulting loop fastener provides a low cost, readily manufactured loop having good fastening properties to hook materials.
