A process and a molding unit for the automatic molding, expelling and assembling to one another of at least a pair of plastic handles for a plastic bag, consisting of a male and female handles (A and B) and provided with snap fastening means (1 and 2) for closing said bag, characterized by the use of a molding unit comprising: - two mold blocks (6 and 14), each having a cavity (6a and 14a) for removably receiving a mold (7 and 15), respectively said cavities (6a and 14a) and the molds (7 and 15) forming two juxtaposed molding chambers, separated from one another by slidable wall members (8 and 9) constituting in combination the countermolds of the two respective molding chambers in operative position thereof, - means for moving the mold blocks (6 and 15) together with the molds (7 and 15) to and from one another, - means for slidably moving said slidable wall (8 and 9) to and from its closing position, - injection means (20, 21, 22, 23) for feeding molded plastic material into both molding chambers shaped to form a female and a male handles (A and B), - punch means (16, 17, 18) to form in each male handle (A) each pin (1) of the snap fastening means (1, 2) as well as the respective pin receiving holes (2), and - stripping means for the expulsion from said molding chambers and mutual assembling of each pair of the male and female handles (A and B) to one another.
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