Hook-and-loop fastener

Abstract: A hook-and-loop fastener comprising a base web (1), a multiplicity of hook elements (3) and loop elements (2) mounted on the base web (1) in rows and vertical lines. In each row, each hook element (3) adjoining a loop element (2) on each side thereof. The distribution ratio of the hook elements (3) to the total of the hook elements (3) and loop elements (2) is approximately 33 percent. Each loop element (2) is 1mm higher than each hook element (3). Each hook element (3) is made of thermoplastic monofilament of 400 through 700 denier.

Description: The present invention relates generally to a hook-and-loop fastener used for garments, pouches, baggages, covers, sheets etc., and more particularly to a hook-and-loop fastener having hook elements and loop elements mounted in a mixed state on its single base web. Since having both hook elements and loop elements mixed thereon, the hook-and-loop fastener may be used in one piece; it has its one part engaged with the other part by folding it thereon. Alternatively, for the same reason, the hook-and-loop fastener may be cut and used in two pieces; the matching pieces of hook and loop fastener may be engaged with each other. A first type of hook-and-loop fastener of the nature described above is disclosed in Japanese Patent Publication No. 38-22830. The conventional hook-and-loop fastener comprises a base web and a multiplicity of hook elements and loop elements mounted on the base web. Rows of hook elements and rows of loop elements may be arranged alternately on the web. Alternatively, hook elements and loop elements are arranged in a mixed state in various ways. A second type of hook-and-loop fastener is disclosed in Japanese Utility Model Laid-open Publication No. 4-6908. This conventional hook-and-loop fastener also comprises a base web and a multiplicity of hook elements and a multiplicity of of loop elements mounted on the base web. Each loop is about 1.5mm to 4mm high and is higher than each hook by about 0.1mm to 2mm. The distribution ratio of the loop elements relative to the total of the hook elements and the loop elements ranges from about 40 to about 60 percents. And, each hook element is made of a thermoplastic monofilament of about 330 denier. A third type of hook-and-loop fastener is often seen on the market. In this conventional hook-and-loop fastener, two rows of hook elements regularly alternate with two rows of loop elements. And, each hook element is made of a thermoplastic monofilament of 360 denier. However, these conventional hook-and-loop fasteners have drawbacks. In the first type of conventional hook-and-loop fastener, two matching pieces of the hook-and-loop fastener in contact with each other face-to-face are very likely to have almost the same patterns of hook and loop element with each other. In other words, almost all hook elements of one piece would touch hook elements of the other piece, while almost all loop elements of one piece touch loop elements of the other piece. Due to fewer engagements of hook elements and loop elements, the intermeshing force of the hook-and-loop fastener is very weak. In the second type of conventional hook-and-loop fastener, hook elements and loop elements are distributed in a ratio of approximately 1 to 1 on a base web. Since fewer loop elements engage with hook elements, intermeshing force of the hook-and-loop fastener is very weak, so that the two matching pieces of hook-and-loop fastener are very liable to detachment from each other. Besides, the intermeshing forces of the hook-and-loop fastener varies considerably depending on where the matching pieces of the book-and-loop fastener are joined. The same thing can be said with the third type of conventional hook-and-loop fastener. With the foregoing difficulties in view, it is therefore an object of the present invention to provide a hook-and-loop fastener wherein two parts or two matching pieces of hook-and-loop fastener are not of the same pattern so that the intermeshing forces of the parts or matching pieces of hook-and-loop fastener is very strong. According to the present invention, there is provided a hook-and-loop fastener comprising a base web, a multiplicity of hook elements and loop elements mounted on the base web in rows and columns, each loop element being 0.1 mm to 2.5 mm higher than each hook element, characterised in that in each row, each hook element has a loop element on each side thereof; the distribution ratio of the hook elements to the total of the hook elements and loop elements being approximately 33 percent; and each hook element being made of thermoplastic monofilament of 400 to 700 denier. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which preferred structural embodiments incorporating the principles of the present invention are shown by way of illustrative example. FIG. 1 is a diagrammatical cross-sectional view of a hook-and-loop fastener according to the present invention. FIG. 2 is a diagrammatical plan view of the hook-and-loop fastener of FIG. 1. FIG. 3 is a similar view to FIG. 2, but showing another embodiment of the present invention. FIG. 4 is also a similar view to FIG. 2, but showing still another embodiment of the present invention. FIG. 5 is a view similar to FIG. 1, but showing yet another embodiment of the present invention. FIG. 6 is a view similar to FIG. 1, but showing still another embodiment of the present invention. Referring now to FIGS. 1, 5 and 6, a hook-and-loop fastener according to the present invention comprises a woven or knitted base web 1, a multiplicity of loop elements 2 and a multiplicity of hook elements 3 mounted in rows and columns lines on the base web 1. The distribution ratio of the hook elements 3 relative to the total of the hook elements 3 and the loop elements 2 is approximately 33 percent. In each row, each hook element adjoins a loop element on each side thereof. In each row, hook elements 3 and loop elements 2 may be arranged without any regular sequence. In other words, variant numbers of the loop elements 2 may be irregularly interposed between the hook elements 3. To be specific, as shown in FIG. 1, three, two and one loop elements 2 are interposed between the hook elements 3 in the inter-hook regions A, B and C, respectively. As shown in FIG. 5, two loop elements 2 may be interposed between every adjacent hook elements 3. In other words, two loop elements 2 may alternate with one hook element 3. Furthermore, the distance between adjacent loop elements 2, 2 and the distance between adjacent hook element 3 and loop element 2 may be non-uniform, or vary from one place to another. As shown in FIG. 6, the distance between each adjacent loop elements 2 in regions D and E is much less than that in other regions; and the distance between the hook element 3 and the adjacent loop element 2 in region F is less than that in other regions. The row arrangement of hook elements 3 and loop elements 2 shown in FIG. 1 may be repeated in every following row like a, a, a, a, a..., as shown in FIG. 2, which means that either hook elements 3 or loop elements 2 are arranged in each vertical line. Alternatively, as shown in FIG. 3, the arrangement may be staggered every other row, like a, b, a, b, a, b,.... Furthermore, as shown in FIG. 4, the arrangement may be staggered every third row, like a, a, a; b, b, b; a, a, a; b, b, b;... Each loop element 2 is made of a multifilament of thermoplastic such as polyamide, polyester, polypropylene or the like. The loop elements 2 are formed by napping the fabric made of the materials mentioned above. Each hook element 3 is made of a monofilament of thermoplastic materials such as mentioned above and of 400 to 700 denier. Each loop element 2 is 0.1mm to 2.5mm higher than each hook element 3. As mentioned above, each hook element 3 adjoins a loop element 2 on each side thereof and each loop element 2 is 1 mm higher than each hook element 3. These two features are combined to thus ensure that, when the two matching pieces of hook-and loop fastener are placed in face-to-face contact with each other, the hook elements 3 and the loop elements 2 of the matching pieces are firmly engaged with each other. With the construction set forth hereinabove, the hook-and-loop fastener according to the present invention enjoys the following advantages. Since the hook-and-loop fastener has many more loop elements per a given unit area than any conventional hook-and-loop fastener; the hook-and-loop fastener is still flexible, although it has its hook elements made of monofilaments of 400 to 700 denier, instead of the conventional ones of 330 to 360 denier, in order to enhance intermeshing forces of the matching pieces. In the hook-and-loop fastener according to the present invention hook elements and loop elements can intermesh with each other more firmly than in any conventional hook-and-loop fastener. The hook-and-loop fastener is more immune from being accidentally peeled from a companion hook-and-loop fastener. Since each loop element is higher than each hook element, the hook-and-loop fastener enjoys increased intermeshing forces. The distance between adjacent loop elements and the distance between adjacent hook element and loop element are nonuniform. This helps to prevent a piece of hook-and-loop fastener from having the same pattern as the matching piece, thus leading to increased intermeshing forces of the matching pieces. Obviously, various modifications and variations of the present invention are possible in the light of the above teaching. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

Claims: A hook-and-loop fastener comprising a base web (1), a multiplicity of hook elements (3) and loop elements (2) mounted on the base web (1) in rows and columns, each loop element (2) being 0.1mm to 2.5mm higher than each hook element (3), characterised in that in each row, each hook element (3) has a loop element (2) on each side thereof: the distribution ratio of the hook elements (3) to the total of the hook elements (3) and loop elements (2) being approximately 33 percent; and each hook element (3) being made of thermoplastic monofilament of 400 to 700 denier. A hook-and-loop fastener according to claim 1, characterised in that in each row the hook elements (3) and loop elements (2) are arranged without any regular sequence. A hook-and-loop fastener according to claim 1, characterised in that the hook elements (3) and loop elements (2) are arranged in respective columns. one column of hook elements (3) alternating with two columns of loop elements (2). A hook-and-loop fastener according to claim 1, characterised in that the distance between adjacent loop elements (2, 2) and the distance between a hook element (3) and an adjacent loop element (2) varies from one place to another on the base web.

Inventors: MURASAKI RYUICHI, OKAWA MITSUHISA, MURASAKI, RYUICHI, OKAWA, MITSUHISA
Applicants: YKK CORP, YKK CORPORATION
Application year: 1993
Main classification: A44B18
IPC codes: A44B18