A method for injection molding at least one first part for an injection device comprising the steps of:A) Injecting a first molding material into a first injection mold to shape the first part whereby the first molding material preferably is a plastic material having non-adhesive properties,B) Providing a second molding material having adhesive properties upon activation,C) Injecting the second molding material into the first injection mold containing the first part or into a second injection mold after the first part has been transferred from the first mold to the second mold, whereby the second molding material is injected onto or around the first part at a location which is intended for adhesive connection between the first part and a second part, whereby the location is in the overlap area between the first part and the second part once the first part and second part have been joined together.
