Plastic snap fastener

Claim 1

A reclosable bag of a heat sealable material having a snap fastener unit comprising: a. a bag with a flap having complementary apertures in the flap and in the bag body; b. said unit having two separable fastener elements; c. each of said elements having a base with a cylinder projecting upwardly therefrom; d. each of the bases of said elements comprising: 1. a raised collar portion immediately adjacent the cylinder; and, 2. a peripheral flange portion; e. the cylinder of the first element having a horizontal rib on the upper portion of the inner surface thereof; f. the cylinder of the second element having a horizontal rib on the upper portion of the outer surface thereof to cooperate with the rib of the first element to snap said elements together; g. the element bases having a roughened upper surface; h. the cylinder and collar of one of said elements projecting through an aperture in the flap of said bag to permit the upper surface of the flange portion of said base to be heat sealed to said flap; i. the cylinder and collar of the other of said elements projecting through an aperture in the body of said bag to permit the upper surface of the flange portion of said base to be heat sealed to the body of said bag; j. the flap element and the body element being positioned to permit closing and opening of said bag upon fastening and separating said elements thereby providing a reclosable bag.