Plastic container with internal liner and method of forming plastic container
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.
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.