Apparatus and process for continuously texturing and post-setting yarns

Claim 2

Apparatus for continuous false-twist texturing and postsetting of yarns of thermoplastic synthetic material comprising false-twist means, heating means and yarn delivering and guiding means, said heating means consisting of two separate hot air boxes adjustable to different temperatures each box having yarn inlet and outlet means and said yarn delivery and guiding means passing each yarn sequentially first through both hot air boxes to effect setting of the false-twist then through the false-twist means and again through the first hot air box to effect postsetting of the yarn.

Claim 3

Apparatus according to claim 1, characterized in that the yarn outlet means (6) on the lower face of the hot air box (5) forming the first heating unit and the yarn inlet means (8) on the upper face of the hot air box (7), forming the second heating unit, are connected by means of a tube (9).

Claim 4

Apparatus according to claim 1, characterized in that, in the hot air box (5) serving as first heating unit, separate exchangeable tubes (33, 34) of heat-conductive material with different heat transfer properties are provided, each for one of the yarn paths through said first hot air box.

Claim 5

Apparatus according to claim 1, characterized in that, in the hot air box (5) serving as first heating unit, a heat-insulating separation wall (30) is provided for separation of the hot air box into two chambers (31,32), each for one of the yarn paths.

Claim 6

Apparatus for continuous false-twist texturing and post-setting of yarns of thermoplastic synthetic material comprising false-twist means, heating means and yarn delivering and guiding means said heating means consisting of two separate hot air boxes adjustable to different temperatures each box having yarn inlet and outlet means, separate exchangeable tube means forming paths for the yarn in each box, and said delivery and guiding means passing each yarn sequentially through tube means in both hot air boxes to effect setting of the false-twist, then through the false-twist means and through tube means in the first hot air box to effect post-setting of the yarn.

Claim 7

Apparatus for continuous false-twist texturing and post-setting of yarns of thermoplastic synthetic material comprising false-twist means, heating means and yarn delivering and guiding means said heating means consisting of two separate hot air boxes adjustable to different temperatures each box having yarn inlet and outlet means, separate exchangeable tube means forming paths for the yarn in each box, and said delivery and guiding means passing each yarn sequentially through tube means in both hot air boxes to effect setting of the false-twist, then through the false-twist means and through tube means in the first hot air box to effect post-setting of the yarn.

Claim 8

Apparatus according to claim 5, wherein the first hot-air box has separate exchangeable tubes consisting of material of different heat-conductivities for the false-twist texturing path and for the post-setting path of the yarn.

Claim 9

Apparatus according to claim 5, wherein the first air box has separate exchangeable tubes of different interior diameters for the false-twist texturing path and for the post-setting path of the yarn.

Claim 10

Apparatus according to claim 5, wherein the first air box is separated into two chambers by a wall of heat-insulating material and exchangeable tube means for the false-twist path and for the post-setting path of the yarn extend through the respective chambers formed by the wall.

Claim 11

Apparatus according to claim 5, characterized in that at least one of the tube means for the two yarn paths in said first box is exteriorly provided with ribs.

Claim 12

Process for continuously false-twist texturing and post-setting of yarns of thermoplastic synthetic material which comprises passing the yarn, before passage through the false-twist imparter, through two heating units which together form the heating path for heat-setting the false-twist and wherein the first heating element is set to a lower temperature than the second heating element and passing the yarn, after passage through the false-twist imparter, once more through the first heating unit for post-setting the yarn.

Claim 13

Process for continuously false-twist texturing and post-setting of yarns of thermoplastic synthetic material which comprises passing the yarn, before passage through the false-twist imparter, through two heating units which together form the heating path for heat-setting the false-twist and wherein the first heating element is set to a lower temperature than the second heating element and passing the yarn, after passage through the false-twist imparter, once more through the first heating unit for post-setting the yarn.

Claim 14

Process according to claim 10, characterized in that, when yarn of polyamide 6.6 or polyester is treated, the first heating unit is set to a temperature of between 160* and 210*C, and the second heating unit is set to a temperature of between 210* and 230*C, and after passage through the false-twist imparter, the yarn is passed again through the first heating unit.