a plant for producing products assembled of injection - molded plastic components . the plant includes a conveying system with one or more rails for conveying the components through the plant , a longitudinal groove formed in each rail for accommodating at least one suspension part of each of the sprues used for injection - molding the components , and a member for slidably displacing the suspension parts in the longitudinal grooves while the sprues are still connected with their components . the plant has a simple and inexpensive construction while also providing a very high production rate .