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US 6,887,418 B2Granted
Post mold cooling of preforms
AssigneeMold-Masters Limited
InventorsGeorge Olaru, Robert Sicilia
Life of this patent
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Abstract
Post-mold cooling of injection molded plastic articles such as preforms is achieved by transferring the articles directly from the mold cavities onto cooling cores carried by a take-out plate. The molded articles are supported on the cooling cores until they become sufficiently frozen that they can be stripped from the cores.
Claims14
A method for post-mold cooling of injection molded articles having neck regions comprising the steps of:
- (a) providing a molding system which includes a mold cavity plate having a plurality of injection cavities, a mold core plate having a corresponding plurality of injection cores receivable in the cavities for forming a plurality of molded articles, and neck ring plates associated with said cavity plate;
- (b) with the mold plates in a closed position, injecting plastic material into the mold cavities to form the molded articles;
- (c) separating the mold plates while retaining the molded articles in the injection cavities;
- (d) providing a take-out plate having retaining cores;
- (e) positioning the take-out plate between the cavity plate and the core plate;
- (f) using said neck ring plates to transfer the molded articles directly from the injection cavities onto the retaining cores by displacing the neck ring plates outwardly of the cavity plate so as to position the molded articles over the retaining cores, and releasing the molded articles from the neck ring plates;
- and
- (g) cooling the molded articles on said retaining cores.
5 more elements
An injection molding apparatus comprising:
- a mold including a mold cavity plate having a plurality of injection cavities and a mold core plate having a corresponding plurality of injection cores receivable in the cavities for forming a plurality of articles, the mold plates being movable between open and closed positions, and an assembly of neck ring plates associated with said cavity plate for forming neck regions of the molded articles;
- a take-out plate including a plurality of retaining cores corresponding to said plurality of cavities;
- means for positioning said take-out plate between said mold plates when the mold plates are in said open position;
- and,
- wherein said neck ring plates are movable outwardly from the mold cavity plate for transferring molded articles from said cavities directly to said retaining cores and being adapted to release the molded articles onto said retaining cores.
2 more elements
Dependencies are inferred from the claim text.