Patent ID: 11865751
Assignee: PI-DESIGN AG
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for producing a double walled drinking vessel, the double walled drinking vessel comprising an outer container and an inner container using an injection mold machine having an injectin mold comprising a first mold portion, a second mold portion facing the first mold portion, the first mold portion and the second mold portion being axially movable relative to each other, the first mold portion forming a first cavity corresponding to an outer shape of the outer container and a second cavity corresponding to an outer shape of the inner container, the first cavity and the second cavity located concentrically with respect to a central axis of the first mold portion, an index plate rotatable around and axially movable along the central axis relative to the first mold portion, the index plate comprising a first core corresponding to an inner shape of the outer container and a second core corresponding to an inner shape of the inner container, and a preload element configured to force the first core into a position in which the first core maximally protrudes from the index plate, the first cavity having a first cavity injection gate for injecting a first mold material into the first cavity for forming the outer container, the second cavity having a second cavity injection gate for injecting a second mold material into the second cavity for forming the inner container, and the first cavity having a further injection gate for injecting a joint material for joining the outer container and the inner container,
the method comprising:
rotating the index plate into a position in which the first core is axially aligned with the first cavity and the second core is axially aligned with the second cavity, the first core being forced into the maximally protruding position from the index plate via the preload element,
closing the injection mold by axially moving the first mold portion relative to the second mold portion, thereby inserting the first core into the first cavity and the second core into the second cavity,
injecting the first mold material into the first cavity through the first cavity injection gate, thereby forming an outer container,
injecting the second mold material into the second cavity through the second cavity injection gate, thereby forming an inner container,
opening the injection mold by axially moving the first mold portion relative to the second mold portion, such that the outer container remains in the first cavity and the inner container is removed from the second cavity by the second core,
rotating the index plate into a position in which the second core holding the inner container is axially aligned with the first cavity comprising the outer container,
closing the injection mold, thereby inserting the inner container into the outer container,
joining the outer container and the inner container by injecting the joint material through the further injection gate of the first cavity, and
opening the injection mold and ejecting the double walled drinking vessel.