Title: Process for continuously bonding staple fibers into a stable band and stable band produced according to the aforesaid process

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Claims: ACCORDINGLY, What is claimed is:

1. Process of adhesively bonding hydrophilic staple fibers into a stable band, comprising the steps of introducing into a fiber arrangement composed of staple fibers an excess of a liquid containing an adhesive distributed therein, squeezing-off the excess liquid from the fiber arrangement, compacting the fiber arrangement into a moist compact by application of pressure thereto, contacting the moist band with a condensing vapor atmosphere formed from the liquid introduced into the fiber arrangement, and forming liquid from the condensing vapor atmosphere at the moist band for suppressing a sandwich-effect, and drying the band by evaporating the liquid of the band for setting the adhesive and transforming the band into the stable band.

2. Process for continously bonding hydrophilic staple fibers into a stable band, comprising the steps of introducing into a fiber arrangement composed of staple fibers an excess of liquid containing an adhesive distributed therein, squeezing-off the excess liquid from the fiber arrangement, compacting the fiber arrangement into a moist compact band by application of pressure thereto, supplying the moist band into a condensing vapor atmosphere, condensing liquid from the vapor atmosphere at the band, and then setting the adhesive in the band by drying of the band for transforming the band into the stable band.

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

4. The process as defined in claim 2, including the step of supplying the moist band into the condensing vapor atmosphere controlled to be at a superheated condition at a temperature of at least 20.degree. C above the boiling point of the liquid introduced into said fiber arrangement.

5. The process as defined in claim 2, including the step of supplying the moist band into the condensing vapor atmosphere produced by evaporation and subsequent superheating of the liquid introduced into the band.

6. The process as defined in claim 2, further including the step of additionally spraying the moist band with liquid prior to supplying the band into the condensing vapor atmosphere.

7. The process as defined in claim 2, further including the step of supplying the moist band into the condensing atmosphere initially produced by atomizing, evaporating and superheating of liquid.

8. The process as defined in claim 2, further including the step of controlling the time of throughpassing of the fiber arrangement between application of the liquid and supplying of the band into the condensing vapor atmosphere so as to be less than one second.

9. A stable band produced according to the process of claim 1.

10. The stable band as defined in claim 9, wherein such stable band, compared with a stable band which has been set in dry air with the same quantity of adhesive, possesses a higher breaking length and better distribution of adhesive over the cross-section of the band.

Other info:

Inventors: Naegeli, Werner (Winterthur, CH)

Application Number: 264622
Filing Date: 1972-06-20
Publication_date: 1977-03-01
Assignee: Pavena AG (Basel, CH)
Primary Class(es): 428/361 156/62.2, 428/378
Other Classes:
US Patent Ref:

3511747	May, 1970	Davies	161/175.
3548462	Dec, 1970	Naegeli	161/177.
3669778	Jun, 1972	Rasmussen	156/62.

Other Refs:
Primary Examiner: Weston, Caleb
Assistant Examiner:
Attorney: Kleeman; Werner W.