FIELD: method and device for injection molding of a plastic part, in particular, injection molding of a plastic part, in particular, injection molding of a plastic device for opening on packing plate material. SUBSTANCE: at least one first and one second moulds are brought in contact respectively with the first and second lateral surfaces of the packing plate material with formation of a shaping cavity between them. At least part of the hole edge is inside the shaping cavity, and part of the plate of the packing plate material located near the part of the hole edge is shifted from the second mould. The first and second moulds are positioned with provision of compression of the part of the packing plate material contacting with the moulds. The shift of the part of the plate of the packing material located near the hole edge from the second mould of the packing material contacting with the moulds. Then plastic material is injected in the shaping cavity for molding of the plastic part, due to it the shift of the part of the plate from the second mould facilitates the molding of plastic material on the part of the second lateral surface of the plate part. Description of the device for the method is also given. EFFECT: provided the respective packing on the hole edge formed in the plate of the packing material. 5 cl, 6 dwg
