Textiles: cloth finishing – Shrinking – Thread compacting
Patent
1995-09-15
1997-09-16
Vanatta, Amy B.
Textiles: cloth finishing
Shrinking
Thread compacting
162111, 162281, D06C 2100, D06C 2304
Patent
active
056667035
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to the longitudinal compressive treatment of webs in which a web is driven forward by being pressed against a drive roll by a sheet-form primary member. A stationary retarding surface or surfaces act to retard the driven web to cause the web to slow and longitudinally compact or crepe in a treatment zone. This technique, sometimes referred to as microcreping because of its ability to produce fine crepes, is exemplified by our prior U.S. Pat. Nos. 3,810,280, 4,142,278 and 5,060,349, which are incorporated herein by reference.
Among the prior art for mounting primary and retarder members in a microcreper is the apparatus disclosed in U.S. Pat. No. 4,717,329. While having advantages in many circumstances, this mounting has drawbacks in the personnel time required in changing the primary and retarder members and in limitations of machine designs possible when employing such a clamp. It would be desirable to have a mounting which avoided such drawbacks, but which still enabled the primary and retarder members to expand and contract with change in temperature without disturbing the geometry of the treatment zone.
SUMMARY OF THE INVENTION
In general, the invention features an apparatus for longitudinal compressive treatment of a continuous web of material, comprising a cylindrical drive roll, a primary sheet-form member in an assembly to engage and press the web against the drive roll, and a sheet holder for positioning the sheet-form member over the drive roll, so that the sheet extends from the sheet holder in the direction of travel of the web. In a first aspect of the invention, a configuration stands from one face of the sheet assembly, this configuration extending transverse to the direction of travel of the web, the sheet holder defines a holding channel transverse to the direction of motion of the web, the channel being open at one of its ends for insertion of the assembly endwise into the sheet holder by sliding motion in the transverse direction, and the channel is engageable with the standing configuration to retain and position the sheet assembly in the longitudinal direction.
Preferred embodiments include the following features. The standing configuration comprises fasteners which are preferably screws and nuts whose heads protrude from the surface of the sheet assembly. The top and bottom surface of the channel each has a groove transverse to the direction of travel of the web, configured to receive, retain, and position the fasteners. The channel is flared at the open end to facilitate mounting of the sheet assembly.
In preferred embodiments the sheet assembly includes a sheet-form retarding member exposed to engage the face of the web downstream beyond the primary member. In certain preferred embodiments the retarding member defines a rough retarding surface for engagement with the web before the web leaves the drive roll while in other preferred embodiments the retarding member is a smooth-surfaced, flexible retarder.
In a second aspect, the invention provides a replaceable, preassembled pressing and retarding sheet unit for use in an apparatus for longitudinal compressive treatment of a continuous web of material. The apparatus includes a cylindrical drive roll for advancing the web and a sheet holder configured to operatively press the sheet assembly unit against the web thereby to compress the web between the preassembled sheet unit and the drive roll. The preassembled sheet unit includes a smooth-surfaced sheet-form primary member configured to be disposed over the drive roll to press the web into driven engagement with the drive roll, sheet-form retarder means joined downstream to the primary member to be in engagement with the web to retard motion imparted by the drive roll to the web, and a configuration securely affixed to and standing from a face of the preassembled sheet unit. The standing configuration mates with a complementary feature of the sheet holder to position the preassembled sheet unit operatively over the drive roll with
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Supplementary European Search Report dated Feb. 2, 1997.
Munchbach George E.
Walton Richard C.
Vanatta Amy B.
Walton Richard C.
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