Method of molding a high moisture barrier and self-desiccating container with living hinge
View Patent ↗A self desiccating container with a living hinge includes a container body made from a resin bonded sorbent and at least one attachment feature, and a container closure having a closure portion engageable with the container body to close the body and an attachment feature compatible with the attachment feature on the container body for securing the closure to the body, and a living hinge connecting the closure portion to the attachment feature.
1. A method of manufacturing a container having: a container body bottom portion and sidewall consisting of a resin bonded sorbent; a container closure engageable with and closing the container body bottom portion and sidewall; and a living hinge connecting the container closure to the container body bottom portion and sidewall, the method comprising:
injection molding, as a single piece using a two-shot molding process, the container body bottom portion and sidewall from a plastic material containing a sorbent additive, and the living hinge integral with the container body bottom portion and sidewall from a plastic material free from the sorbent additive, the container body bottom portion and sidewall consisting of the plastic material containing the sorbent additive.
2. The method of claim 1 , further comprising injection molding the living hinge integral with the container body bottom portion via an upper portion of the container body, wherein the container body bottom portion is molded in a first shot, and the living hinge, the upper portion, and the closure are molded in a second shot free from the sorbent additive separate from the first shot.
3. The method of claim 1 in which the sorbent additive comprises a desiccant.
4. The method of claim 1 in which the sorbent additive comprises an oxygen absorber.
5. The method of claim 1 , wherein the injection molding the living hinge further comprises injection molding the container closure integrally with the living hinge.
6. The method of claim 1 wherein at least one of the plastic material comprising the sorbent additive and the plastic material free from the sorbent additive comprises high density polyethylene.
7. The method of claim 1 wherein at least one of the plastic material comprising the sorbent additive and the plastic material free from the sorbent additive comprises polypropylene.
8. The method of claim 1 wherein the plastic material comprising the sorbent additive comprises between about five and about 50% by weight of the sorbent material.
9. The method of claim 8 characterized in that the container body comprises about 30% by weight of the sorbent material.
10. The method of claim 1 wherein the sorbent material is selected from the group consisting of gel or sieve, clay, calcium oxide, or carbon.
11. A method of forming a one-piece container having a container body bottom portion including a sidewall of the container, a closure, and a living hinge connecting the sidewall and the closure, the method comprising:
providing a mold;
filling a first portion of the mold corresponding to the container body bottom portion, including the sidewall, with a first material comprising a sorbent material such that the sidewall consists of the first material comprising the sorbent material; and
filling a second portion of the mold corresponding to the living hinge with a second material free of sorbent material.
12. The method of claim 11 , wherein the second portion of the mold further corresponds to the closure.
13. The method of claim 11 , further comprising filling a third portion of the mold corresponding to the closure with the first material.
14. The method of claim 11 , wherein the filling the second portion of the mold comprises filling the second portion of the mold in the absence of curing the first material and in the absence of removing the container body bottom portion from the mold.