Hook structure of a soft hook strap of a hook-and-loop fastener

Abstract

An improved hook structure, of a soft hook strap of a hook-and-loop fastener, has a width W and includes: a hook body integrally protruding upright from a substrate of the hook strap; and a curved head portion curvedly bent downwardly from a top end of the hook body, the head portion including a hook end and a neck portion extending between the hook body and the hook end, wherein a lower side of the neck portion has a curvature defined by an imaginary circle located in a space between the hook body and the hook end and the head portion has a height H defined by points A and B on head portion which are intersection points of a imaginary vertical line passing through the center of the circle intersecting with an upper side and the lower side of the head portion respectively. The width W of the hook structure and the height H of the head portion satisfies a relationship defined below:

$0.1<1-\frac{H}{W}<0.3.$

Description

FIELD OF THE INVENTION[0001]The present invention relates generally to hook-and-loop fasteners, and more specifically, to an improved hook structure of a soft hook strap of a hook-and-loop fastener.BACKGROUND OF THE INVENTION[0002]A hook-and-loop fastener (also known as ‘Velcro’) is a well know mechanical fastener and wildly used in a variety of fields that need to fasten two separate parts together, such as garment, shoes, personal care product (such as diapers) etc., because of its easy engaging / disengaging features. The hook-and-loop type fastener mainly consists of a hook strap on which an array of hooks are formed and a loop member on which a plurality of loops are formed to be engage with the hooks of the hook strap. In order to be applicable to different applications, the design of the hook-and-loop fastener (especially, the hook strap) has to be modified to meet specific requirements of a specific application.[0003]For instance, in the field of clothing and garment, the hook...

AI Technical Summary

Benefits of technology

[0005]The inventor of the present invention realizes that using a material having a proper softness and flexibility to form the hook strap is a key factor to allow the hook strap to have a required suppleness, and on top of that a proper design of the hook structure of the hook strap is another key factor that would remarkably affect the suppleness of the hook strap. After a long term research performed by the inventor of the present invention, the inventor of the present invention concludes that the above-mentioned lo

Problems solved by technology

Additionally, in the field of diapers, because the hook strap used on a diaper as a fastening means to fasten the diaper on a wear is in direct contact with wear's skin, thus if the hook strap does not have sufficient suppleness, the wearer of the diaper may feel uncomfortable and may even leave a mark on the skin of the wearer.

Therefore, it is a

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