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

Claim 2:
3. 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, 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,
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,
opening the injection mold and ejecting the double walled drinking vessel,
rotating the index plate into a position in which two first cores of the first core are axially aligned with two first cavities of the first cavity, two second cores of the second core are axially aligned with two second cavities of the second cavity and two remaining second cores of the second core are axially aligned with two remaining first cavities of the first cavity,
closing the injection mold by axially moving the first mold portion relative to the second mold portion, thereby inserting the first cores into the first cavities, the two second cores into the two second cavities and the two remaining second cores into the two remaining first cavities,
injecting the first mold material into the first cavity into which the two first cores are inserted through the first cavity injection gate, thereby forming two outer containers,
injecting the second mold material into the second cavity into which the two second cores are inserted through the second cavity injection gate, thereby forming two inner containers,
opening the injection mold by axially moving the first mold portion relative to the second mold portion, such that the two outer containers remain in the first cavity and the two inner containers are removed from the second cavity by the second core,
rotating the index plate forward by 45° into a position in which the second core holds the two inner containers, the two inner containers being axially aligned with the two first cavities comprising the two outer containers, the two first cores are axially aligned with the two first cavities and the two remaining second cores are axially aligned with the two second cavities,
closing the injection mold, thereby inserting the two inner containers into the two outer containers, inserting the first core into the first cavity and inserting the two remaining second cores into the second cavities,
joining the outer container and the inner container by injecting the joint material through the further injection gate of the first cavity,
injecting the first mold material into the first cavity into which the two first cores are inserted through the first cavity injection gate, thereby forming two outer containers,
injecting the second mold material into the second cavities into which the second cores are inserted through the second cavity injection gate, thereby forming two inner containers,
opening the injection mold such that the two outer containers remain in the first cavity and the two inner containers are removed from the second cavity by the second cores,
ejecting the two double walled drinking vessels,
rotating the index plate backward by 45° into a position in which the second core holds the two inner containers are axially aligned with the two first cavities comprising the two outer containers, the two first cores are axially aligned with the two first cavities and the two remaining second cores are axially aligned with the two second cavities, and
closing the injection mold and starting from the beginning again.