Method for forming a non-delaminating multilayer container mouth
AssigneeDTL Technology Limited Partnership
InventorsMartin H. Beck, George F. Rollend
Life of this patent
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Abstract
A method of preventing delamination of multiple layers of an oriented polymer container having an opening defined by the multiple layers comprising a bi-axially oriented multilayer polymer container having an opening defined by a perimeter at which the multiple layers are exposed; heating the perimeter until workable; providing a curling die; feeding the multilayer perimeter into the curling die to curl the perimeter sufficiently to inhibit delamination of the layers and a container when so made.
Claims20
A method of preventing delamination of multiple layers of at least one polymer container having an opening defined by the multiple layers, the multiple layers comprising a first layer and at least one second layer attached to the first layer, the method comprising the steps of:
- a) providing an intermediate article having an opening and trimming a waste portion of a perimeter of the intermediate article to form a polymer container having a perimeter at which the multiple layers are at least partially exposed;
- b) heating said perimeter until at least said perimeter is workable;
- c) providing a curling device;
- and
- d) using said device to curl said perimeter sufficiently to maintain said multiple layers intact and inhibit delamination of the multiple layers from one another.
A method of preventing delamination of at least on plastic layer from a barrier layer defining a polymer container having an opening, the method comprising the steps of:
- a) forming, by a blow molding process, the polymer container having at least one plastic layer and a barrier layer;
- b) trimming a waste portion of a perimeter of the polymer container to define the opening of the polymer container whereby the at least one plastic layer and the barrier layer are both at least partially exposed by the trimming step and at least a portion of the perimeter of the polymer container is partially delaminated;
- b) heating the perimeter of the polymer container until the perimeter is sufficiently soften;
- c) engaging the perimeter of the polymer container with a curling device;
- and
- d) sufficiently curling the perimeter of the polymer container so that the sufficiently soften perimeter forms a curled perimeter without delamination of the at least one plastic layer and the barrier layer from one another and the sufficiently curled perimeter imparts sufficient resistance to delamination of the at least one plastic layer and the barrier layer from one another.
A method of preventing delamination of at least one plastic layer from a barrier layer defining a polymer container having an opening, the method comprising the steps of:
- a) forming, by a blow molding process, an intermediate article having at least one plastic layer and a barrier layer;
- b) trimming a waste portion of a perimeter of the intermediate article to form the polymer container and define the opening of the polymer container whereby the at least one plastic layer and the barrier layer are both at least partial exposed by the trimming step and at least a portion of the perimeter of the polymer container is partially delaminated;
- c) heating the perimeter of the polymer container until the perimeter is sufficiently soften so that separation between the barrier layer and the at least one plastic layer, due to stiffness and lack of adhesion, is delayed;
- d) engaging the perimeter of the polymer container with a curling device;
- and
- e) sufficiently curling the perimeter of the polymer container about an angle of at least about 180° so that the sufficiently soften perimeter forms a curled perimeter without delamination of the at least one plastic layer and the barrier layer from one another and the sufficiently curled perimeter imparts sufficient resistance to delamination of the at least one plastic layer and the barrier layer from one another.
Dependencies are inferred from the claim text.