Injection mold having an in-mold lid closing device
An injection mold for molding a flip-top closure having a body portion and a lid attached to the body portion by a living hinge has first and second mold portions for defining first and second portions of the flip-top closure respectively, a lid closing tool for closing the lid of the flip-top closure on the body portion after a molding of the flip-top closure in the injection mold and before an ejection of the flip-top closure from the injection mold, and first and second linear actuators operatively connected to the lid closing tool for moving the lid closing tool about first and second axes respectively. The first and second linear actuators are controllable to move the lid closing tool along a lid closing path for closing the lid. An in-mold lid closing device and a method for making a flip-top closure are also disclosed.
1. An injection mold for molding a flip-top closure, the flip-top closure having a body portion and a lid attached to the body portion by a living hinge, the injection mold comprising:
a first mold portion for defining a first portion of the flip-top closure;
a second mold portion for defining a second portion of the flip-top closure;
a lid closing tool for closing the lid of the flip-top closure on the body portion after a molding of the flip-top closure in the injection mold and before an ejection of the flip-top closure from the injection mold;
a first linear actuator operatively connected to the lid closing tool for moving the lid closing tool about a first axis; and
a second linear actuator operatively connected to the lid closing tool for moving the lid closing tool about a second axis,
the first and second linear actuators being independently controllable to move the lid closing tool along one of a plurality of lid closing paths for closing the lid of the flip-top closure on the body portion;
wherein a velocity of the lid closing tool and a force applied by the lid closing tool are independently controllable and adjustable by controlling the first and second linear actuators.
2. The injection mold of claim 1 , wherein:
the flip-top closure is held onto the second mold portion after the molding of the flip-top closure in the injection mold and before the ejection of the flip-top closure from the injection mold; and
the first linear actuator is connected to the second mold portion.
3. The injection mold of claim 2 , wherein:
the second linear actuator is connected to the first linear actuator;
the second linear actuator is movable about the first axis by the first linear actuator; and
the lid closing tool is movable about the first axis together with the second linear actuator.
4. The injection mold of claim 1 , wherein the first axis is perpendicular to the second axis.
5. The injection mold of claim 1 , wherein the lid closing path comprises at least one curved portion for pivoting the lid relative to the body portion.
6. The injection mold of claim 1 , wherein the first and second linear actuators each comprise a servomotor.
7. The injection mold of claim 6 , wherein the first and second linear actuators each further comprise a ball screw operatively connected to the servomotor.
8. The injection mold of claim 1 , wherein:
at least one of the first and second mold portions defines a cavity; and
the lid closing tool is disposed at least in part in the cavity during the molding of the flip-top closure in the injection mold.
9. The injection mold of claim 1 , wherein:
the injection mold molds a plurality of flip-top closures; and
the lid closing tool is a plurality of lid closing tools operatively connected to the first and second linear actuators.
10. The injection mold of claim 9 , further comprising a tool mounting bar connected to the second linear actuator; and
wherein the plurality of lid closing tools is mounted to the tool mounting bar.