Title: Process for continuously bonding staple fibers into an essentially non-twisted yarn

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Claims: What is claimed is:

1. A process for the continuous bonding of staple fibers into an essentially non-twisted yarn, comprising the steps of introducing an excess amount of liquid containing an adhesive in distributed form into a fiber arrangement composed of staple fibers, squeezing out the excess liquid from the fiber arrangement, compacting the fiber arrangement by application of pressure into a moist slubbing, feeding the moist slubbing into contact with a condensing vapor atmosphere for condensing vapor of the vapor atmosphere at the slubbing and setting the adhesive by drying of the slubbing for transforming the slubbing into an adhesively bonded yard.

2. The process as defined in claim 1, including the step of introducing the liquid into the fiber arrangement at room temperature and supplying the moist slubbing at said room temperature into said condensing vapor atmosphere.

3. The process as defined in claim 1, including the step of feeding the moist slubbing into the condensing vapor atmosphere controlled to be in a superheated condition and at a temperature of at least 20.degree. C above the boiling point of the introduced liquid.

4. The process as defined in claim 1 including the step of feeding the moist slubbing into the condensing vapor atmosphere produced by evaporation and subsequent superheating of the liquid introduced into the slubbing.

5. The process as defined in claim 1, further including the step of additionally supplying liquid to the slubbing prior to feeding such into contact with the condensing vapor atmosphere.

6. The process as defined in claim 1, including the step of feeding the moist slubbing into the condensing vapor atmosphere initially produced by atomizing, vaporizing and superheating the liquid.

7. The process as defined in claim 1, including the step of controlling the time of throughpassing of the fiber arrangement between application of the liquid and feeding the slubbing into contact with the condensing vapor atmosphere so as to amount to less than 1 second.

8. The process as defined in claim 1, further including the step of subjecting the yarn to cooling following setting of the adhesive.

9. The process as defined in claim 1, including the step of feeding a moist slubbing comprising staple fibers possessing hydrophilic properties into the condensing atmosphere.

10. The process as defined in claim 1, including the step of feeding a moist slubbing comprising staple fibers possessing hydrophobic properties into the condensing atmosphere.

11. The process as defined in claim 1, including the step of utilizing the yarn as warp material without any sizing treatment.

12. An adhesively bonded yarn produced according to the process of claim 1.

13. The adhesively bonded yarn as defined in claim 12, wherein said yarn, compared with a yarn which has the same quantity of adhesive and set in dry air, possesses a greater breaking length and rupture elongation and a smoother surface.

14. The yarn as defined in claim 13, employed as warp material witout any sizing treatment.

15. The process as defined in claim 1, including the step of drying the slubbing by evaporating the liquid applied to the slubbing for setting the adhesive and transforming the slubbing into adhesively bonded yarn.

16. A process for adhesively bonding staple fibers into an essentially non-twisted yarn, comprising the steps of introducing an excess amount of liquid containing an adhesive in distributed form into a fiber arrangement composed of staple fibers, squeezing out the excess liquid from the fiber arrangement, compacting the fiber arrangement by application of pressure into a moist slubbing, and bringing the slubbing into contact with a condensing vapor atmosphere for suppressing a sandwich-effect by condensing vapor of the vapor atmosphere at the slubbing, and drying the slubbing by evaporating the liquid applied to the slubbing for setting the adhesive and transforming the slubbing into an adhesively bonded yarn.

Other info:

Inventors: Naegeli, Werner (Winterthur, CH)

Application Number: 263935
Filing Date: 1972-06-19
Publication_date: 1977-03-01
Assignee: Pavena AG (Basel, CH)
Primary Class(es): 156/296 19/66R, 28/116, 427/335, 427/365, 427/389.9, 428/361, 428/378
Other Classes:
US Patent Ref:

2689813	Sep, 1954	Lawrence	161/176.
2834704	May, 1958	Lawrence	156/180.
3426389	Feb, 1969	Naegeli	19/66.
3432889	Mar, 1969	Naegeli	19/66.
3512232	May, 1970	Bolinger	161/176.

Other Refs:
Primary Examiner: Van Horn, Charles E.
Assistant Examiner: Ball, Michael W.
Attorney: Kleeman; Werner W.