Abstract: The invention discloses a fiber filament non-woven fabric with a small pore size and a large porosity, which adopts an island type ultra-fine fiber single filament, which is juxtaposed into an unidirectional silk layer several times, and a thin strip-shaped liquid is applied laterally on the unidirectional silk layer. The resin adhesive liquid bonds and fixes all the silk layers into a unidirectional non-woven fabric fixed in a grid segment. The unidirectional non-woven fabric is covered with meltblown non-woven fabric on one or both sides to make a filter material that can 100% filter viruses, bacteria, and micro-particles smaller than PM2.5. It can also be used for a wider range of filter materials, thermal insulation materials, oil absorption materials, battery separator materials, medical and health materials, environmental protection materials, clothing materials, wiping materials.

Abstract: This invention is a set of fastening multilayer connectors connected together that has triangular flanges on both sides, and flat in between latitutinally or laterally. The invented connector has an inner layer and an outer layer. The inner spring steel wire 2, processed into two triangular or other shaped flanges. The outer layer 1, wraps around the inner layer, and fills the voids in the inner layer. The outer connecting member may also wrap around or suit the inner layer member. The connector is suitable to connect rigid non-metallic material parts, such as hand-made fiberglass assembly boats and watercrafts, as well as plastic assembly boats and watercrafts made by rotational molding, injection molding or blow molding. The present invention is also applicable to connect parts that are made of non-metallic materials with grooves.

Abstract: A fastening apparatus of a combined boat for securely joining boat hulls of the combined boat is disclosed. Grooves (3) are provided at the peripheries of joints of the boat hulls. The fastening apparatus includes a holding band (2) with ridges (4) mating with the grooves (3), and the holding band engages via the ridges (4) with the grooves (3) so as to join the boat hulls of the combined boat together securely. The fastening apparatus of the combined boat is simple in structure, easy to manufacture, and convenient to assemble and disassemble.

Abstract: A fastening apparatus of a combined boat for securely joining boat hulls of the combined boat is disclosed. Grooves (3) are provided at the peripheries of joints of the boat hulls. The fastening apparatus includes a holding band (2) with ridges (4) mating with the grooves (3), and the holding band engages via the ridges (4) with the grooves (3) so as to join the boat hulls of the combined boat together securely. The fastening apparatus of the combined boat is simple in structure, easy to manufacture, and convenient to mount and dismount.