Hook and loop fastener, touch fasteners (English: Hook and loop fastener, touch fasteners, called Velcro in Hong Kong, also known as devil stick, devil felt, hook and loop tape, the foreign brand name is "Velcro") , is a fiber fastener, invented by the company "Velcro" (Velcro, or "Velcro") [4]. It usually consists of two fabrics, one surface covered with a loop structure and the other surface covered with a hook structure.

When two pieces of fabric are pressed together, the hook and loop combine to form a temporary fastening state. If you want the two to separate, just use force to separate them. In fact, the first nylon buckle was made of pure cotton [5], but it was later found to be impractical and nylon was used instead. Velcro's patent registered in 1948 expired in 1978, but Velcro has become a well-known registered trademark, so Velcro is often used as a synonym for Velcro in the Western context.

Velcro can be used in multiple ways and with a high degree of freedom. It is widely used in outdoor products, such as backpacks, tents, safety equipment, sportswear, sports shoes, etc. The hook-and-loop back-to-back product can easily bundle fishing rods or rope knots; the ultrasonic-pressed straps can adjust the length according to needs and quickly store sleeping bags and tents. Even in harsh environments, the strong pull of Velcro still works.

Hook Structure Process

After the hook surface of traditional Velcro is woven into a loop from nylon yarn, the top of the loop is cut off to form a thin hook shape. Later, based on the requirements for adhesion and durability, the hook surface was directly heat-melted into a mushroom head shape using a thermal processing process. Recently, plastic injection molding has also been used to directly produce a hook-shaped structure, which can increase the lateral pulling force and eliminate the need for processes such as sewing and high-frequency lamination.