IP Library › Granted Patent US 12691627
Granted Patent B2
US 12691627 · App. 18/534,125 · Granted Jul 28, 2026

Plastic container with internal liner and method of forming plastic container

Inventors: Marc A. Pedmo (Litchfield, OH); Andrew Fischer (Valley City, OH)
Assignee: Plastipak Packaging, Inc.
B29C49/251B29C49/22B29C49/68B65D1/0215B65D23/02B65D65/38B29C2049/2404B29C2949/0715B29K2067/003B29K2105/26B29L2031/7158B65D2565/384
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Quick Facts
Patent No.
US 12691627
App. No.
18/534,125
Granted
Jul 28, 2026
Kind
B2
Abstract

A plastic container assembly includes an outer container and an inner liner or bag, wherein the inner liner or bag is expanded within the outer container. Processes for making a plastic container with an inner liner are also disclosed.

Claims (17)

1 . A method of forming a plastic container, comprising:

providing an inner liner comprised of a polymer;

providing a molded outer container comprised of a polymer;

disposing the inner liner within the outer container; and

expanding the inner liner within the outer container;

wherein portions of inner walls of the outer container serve as a mold; and the inner liner is expanded at a different rate than the outer container was previously expanded during molding.

2 . The method of claim 1 , wherein the inner liner is disposed on a nozzle prior to forming the inner liner.

3 . The method of claim 1 , wherein a gas forms the inner liner within the outer container.

4 . The method of claim 1 , wherein outer container is formed by blow molding a molded preform.

5 . The method of claim 1 , wherein the inner liner is provided as an inner molded preform.

6 . The method of claim 1 , including heating the inner liner above its glass transition temperature (T g ).

7 . The method of claim 6 , wherein the heating is via an infrared (IR) oven.

8 . The method of claim 1 , wherein the entire inner molded liner is disposed within the outer container prior to expanding the inner liner.

9 . The method of claim 1 , wherein the inner liner is heated, a gas is introduced to form the inner liner within the outer container, and a pressure exerted to form the inner liner is between about 1 and about 14 bar.

10 . The method of claim 1 , wherein the inner liner is heated, a gas is introduced to form the inner liner within the outer container, and a pressure exerted to form the inner liner is less than 7 bar.

11 . The method of claim 1 , including an introduction or insertion of a gas into the outer container as a buffer between the outer container and the inner liner.

12 . The method of claim 1 , wherein the outer container is provided over the inner liner.