초록 ▼

A multi-layer preform (26a,26b,26c) used for plastic blow molding and a method for making the preform provides an inner layer (28) of polyethylene naphthalate and an injection molded outer layer (30) of polyethylene terephthalate which has reduced transmission of gas upon blow molding as a container

A multi-layer preform (26a,26b,26c) used for plastic blow molding and a method for making the preform provides an inner layer (28) of polyethylene naphthalate and an injection molded outer layer (30) of polyethylene terephthalate which has reduced transmission of gas upon blow molding as a container due to the gas barrier provided by the inner layer of polyethylene naphthalate. The inner layer (28) of polyethylene naphthalate by itself or along with a further inner layer (32) of virgin polyethylene terephthalate is thermoformed prior to the injection molding of the outer layer (30) of polyethylene terephthalate. A minimal amount of the polyethylene naphthalate which is relatively expensive can be utilized due to the thermoforming and injection molding as disclosed.

대표청구항 ▼

A method for making a multi-layer preform used for plastic blow molding, the method comprising: thermoforming a sheet of polyethylene naphthalate to provide an inner layer that functions as a gas barrier; and injection molding an outer layer of polyethylene terephthalate around the inner layer of po

A method for making a multi-layer preform used for plastic blow molding, the method comprising: thermoforming a sheet of polyethylene naphthalate to provide an inner layer that functions as a gas barrier; and injection molding an outer layer of polyethylene terephthalate around the inner layer of polyethylene naphthalate which limits the transmission of gas through the outer layer of polyethylene terephthalate upon blow molding of the preform into a container.