Device for producing pin-shaped end products by the injection-molding process

• Main Authors: DENIS MURENA, WERNER DIEM
• Format: Patent
• Language: English
• Published: 20.11.2012
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention relates to an injection-molding tool and to a process for producing pin-shaped blanks as end products, a two-dimensional skin cavity and blank cavities connected to said skin cavity being provided at a runner, in order to be able to form a molding, including a sprue, a skin and the blanks formed on said skin via defined predetermined breaking points. In this case, the injection-molding tool makes it possible before and at the beginning of the injecting operation to create a negative pressure in the cavities and makes it easier after the molding material has solidified to demold the molding obtained by introduced compressed air. In this case, the injection-molding tool is constructed in such a way that the demolding of the blanks is performed separately from the demolding of the skin and the sprue, the demolding also being accompanied by detachment of the blanks from the skin by the lifting movement during the opening of the injection-molding tool, and the blanks being discharged with preference without being acted upon by a manipulator, on account of the loss of form fit and under the action of gravitational force, and the injection-molding tool being made operationally ready again at the end of the cycle by a closing operation.