Molding system and method for manufacturing modular interlocking articles
Described are a mold and molding process for manufacturing devices and containers that are scalable, modular, and lockable laterally and vertically with other like devices or containers. The mold is formed with a cup mold and top end mold sections specially designed to allow for molding and demolding a container with an undercut. The cup mold includes, on a vertical wall, one or more undercuts. Multiple undercuts may further form tongues with undercuts each of which forms a groove with undercuts on the molded article, and/or one or more grooves with undercuts each of which form a tongue with undercuts in the molded article. Molding and Demolding of the article with undercuts is further enabled by utilizing an improved method of molding said article with an undercut, and demolding said article from the mold once it is molded, by improvements to each stage of the molding process, including the preform stage, the conditioning station stage, the blow stage and the release stage.
1. A method for forming a molded article, comprising:
providing a cup mold with an undercut on a vertical wall;
providing a top end mold assembly;
placing a preform in a mold cavity created by the cup mold and the top end mold assembly;
blowing air into the preform to form the molded article within the mold cavity;
removing trapped air in the mold cavity through vent relief channels placed in various positions around the cup mold that extend from an interior of the mold cavity to ambient atmosphere; and
demolding the molded article using countercuts around the top end mold assembly and moving top end mold sections of the top end mold assembly away from each other and by removing the molded article vertically from the cup mold;
wherein the countercuts are formed by locating a vertical parting line between the top end mold sections of the top end mold assembly at the exact center of two opposing tongues, and above a horizontal mold line between the cup mold and the top end mold assembly.
2. The method of claim 1 , wherein the blowing step comprises forming the molded article with one or more untapered, perpendicular walls.
3. The method of claim 1 , wherein the blowing step comprises forming undercuts on a tongue of the molded article.
4. The method of claim 1 , wherein the method for forming an article further comprises moving the top end mold sections of the top end mold assembly between opposing open and closed positions.
5. The method of claim 1 , wherein blowing air further comprises performing a pre-blow process at a first predetermined pressure that partly expands the preform.