Composite touch fasteners and methods of their manufacture

Abstract

A composite hook and loop fastener in the form of an elongated strip has an elongated loop component, a hook component permanently affixed to the loop component, and a backing layer disposed on a face of the wrap tie in a discrete region. The backing layer is used for permanent attachment of the wrap tie to a supporting surface. One end of the loop component is available for encircling an object to be wrapped and engaging the fastener elements of the hook component. The loop component has a self-supporting web of entangled fibers, the fibers forming both a sheet-form body and hook-engageable, free-standing loops extending from at least one surface of the body, and the hook component has fastener elements extending from a common base. The backing layer may be a pressure sensitive adhesive or a synthetic resin.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to composite hook and loop fasteners, methods of their manufacture and products containing them. [0002] A typical composite hook and loop fastener is produced by taking preformed hook and loop material and overlapping and attaching the two materials together along their edge margins or by totally overlapping one on top of the other. The attaching is usually done by ultrasonic welding, thermal fusing or an adhesive bond. This step of attaching preformed hook and loop material to form the composite fastener adds additional cost to the manufacturing process. Hook and loop materials may also be laminated in-situ during the formation of the hook component. [0003] One particular application for an improved composite fastener, discussed in more detail below, is as a wrap tie for closing bags. An economical bag tie commonly used in retail stores comprises a wire covered with paper. The wire tie is wrapped around an open end of a bag ...

AI Technical Summary

Benefits of technology

[0019] Among the advantages of the invention may be one or more of the following. The wrap-tie of this invention does not have any sharp or metal parts, which may cut the bag when they become exposed, pose injury risk for the consumer or oxidize and thus contaminate the bag and its contents. There is no preferred direction or need to twist the wrap tie, thus making it easy to open and close the bag opening. Further the wrap tie of this invention can be pre-attached to a bag automatically or can be dispensed from a wrap tie dispenser for manual attachment to a bag. The very low thickness and stiffness of both the non-woven loop material and the hook material, along with its low cost and good closure performance, make the wrap tie a particularly useful component of many products.

Problems solved by technology

This step of attaching preformed hook and loop material to form the composite fastener adds additional cost to the manufacturing process.

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