Abstract: The present invention discloses an apparatus for indicating the passage of time, comprising a substrate and an indicating layer formed on the substrate. The indicating layer comprises a polymer matrix and a predetermined amount of redox compound under the reduced form. The redox compound is dispersed in the polymer matrix and has the following properties: the reduced form of the redox compound reacts with oxygen to form the oxidized form of the redox compound; the hue or color density of the reduced form of the redox compound is different from that of the oxidized form of the redox compound; and the hue or color density of the indicating layer varies as the time for the reduced form of the redox compound contacting with oxygen in environment increases to have the amount of the oxidized form of the redox compound increase so as to indicate the passage of time.

Abstract: A forming method of a foam board includes a hard plastic top plate and a hard plastic bottom plate provided respectively on and under a foam board placed in a mold. In a forming process by heating, the peripheral edges of the hard plastic top and the bottom plate respectively bend downward and upward automatically and extend to stick on the peripheral side edge of the foam board and fusing and adhering with each other to make up an integral peripheral edge so as to elevate the rigidity and safety of the foam board and enable it endure grinding.

Abstract: A forming method of a foam board includes a hard plastic top plate and a hard plastic bottom plate provided respectively on and under a foam board placed in a mold. In a forming process by heating, the peripheral edges of the hard plastic top and the bottom plate respectively bend downward and upward automatically and extend to stick on the peripheral side edge of the foam board and fusing and adhering with each other to make up an integral peripheral edge so as to elevate the rigidity and safety of the foam board and enable it endure grinding.

Abstract: A molding method for protective equipment includes seven steps. A first step is to prepare a mold consisting of an upper and a lower mold respectively provided with a mold hole. A second step is to heat the mold to a preset first temperature. A third step is to place a plastic plate and a foam member in the mold. A fourth step is to move the upper mold nearer to the lower mold, and then close up the upper mold on the lower mold in a preset time for the two materials to melt. A fifth step is to heat the mold to a second temperature higher than the first temperature so that the outer surface of the two materials may melt. A sixth step is to cool the mold to a preset temperature to let the two materials cool to form a shape. The seventh step is to open the mold and take out a finished product.

Abstract: A method for making a surfboard includes six steps of processes. The first step is to prepare and cut plastic plate material into a panel. The second step is to place it in a mold to hotly press to let the panel foam half. The third step is to take the half-foamed prototype out of the mold to let it continue to foam to expand. The fourth step is to place the fully foamed prototype in a baking device to heat it into an almost completed surfboard. The fifth step is to place it in a cooling mold to cool and harden to become a finished surfboard. The sixth step is to take the finished surfboard out of the cooling mold. Thus the method can shorten the time for making a surfboard and save material waste.

Abstract: A surfboard includes a board and a plate secured to the bottom of the board and formed by a foamable material. A reinforcing mesh is embedded in the plate and includes a number of mesh openings. The material for forming the plate is engaged into the mesh openings for allowing the reinforcing mesh to be solidly embedded in the plate and for greatly increasing the strength of the surfboard. The reinforcing mesh may be embedded in the lower portion of the plate or may includes a thickness equals to that of the plate or greater than that of the plate.

Abstract: A method for making a surfboard includes a foamable material sheet cut into a number of panels and disposed in a mold device for hot pressing the panels and for expanding the panels to a prototype having a volume about 6 to 10 times greater than that of the panels. The prototype is then hot-pressed again for further expanding the prototype to the surfboard having a volume about 2 to 3 times greater than that of the prototype. The mold cavity includes tapered peripheral portions for forming tapered sides and tapered nose and tapered tail for the surfboard.