Abstract: A watertight rope light of the present invention includes two parallel wires, a plurality of light emitting diodes and a transparent enclosing layer. The light emitting diodes are substantially parallel to the wires. Each light emitting diode has a semiconductor die, a lens, an anode leg and a cathode leg. The lens has a distal end, which is formed with an awl-shaped concave surface, and the semiconductor die is adapted to emit light toward the concave surface. As such, the light emitted from the semiconductor die can be reflected radially outward to illuminate the surrounding uniformly.

Abstract: The present invention provides a method for making a cap adapted for a PET bottle. The method includes a melting and blending step, comprising preparing a slurry substantially consisting of polyethylene terephthalate raw material, plasticizer and nano clay; and an injection molding step to mold the cap. Thereby, the cap has enhanced mechanical properties to facilitate follow-up mechanical process. Due to the composition of the cap being highly similar to that of the bottle, the difficulty of recycling PET bottle can be significantly reduced and the cost thereof can also be lowered.

Abstract: A watertight rope light of the present invention includes two parallel wires, a plurality of light emitting diodes and a transparent enclosing layer. The light emitting diodes are substantially parallel to the wires. Each light emitting diode has a semiconductor die, a lens, an anode leg and a cathode leg. The lens has a distal end, which is formed with an awl-shaped concave surface, and the semiconductor die is adapted to emit light toward the concave surface. As such, the light emitted from the semiconductor die can be reflected radially outward to illuminate the surrounding uniformly.