Process and apparatus for controlling the gap width of a reclosable closure profile for a thermoplastic container
AssigneeDowbrands L.P.
InventorsBrian C. Dais, Jose Porchia
Life of this patent
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Abstract
A process and apparatus for forming a reclosable closure profile, wherein the configuration of the closure profile is mechanically altered for controlling the width of the gap in a groove member by passing the closure profile, while still hot enough to be formed, through a profile gapping means, whereby the surfaces of the closure profile contact the gapping means, thereby maintaining the desired final gap width of the closure profile and/or whereby the gapping means includes a cutting means for notching the base of the groove member for controlling the closure force of the groove member.
Claims23
An apparatus for maintaining the gap between arm portions of a female profile member at a certain width for a reclosable plastic container and capable of cutting a base portion of the female profile member comprising extrusion means for forming the female profile member, a rigid separator gapping means located downstream from said extrusion means adapted to be placed between the arm portions of the female profile while cooling for maintaining the arm portions separated and apart, said gapping means including a leading edge capable of cutting the base portion of the female profile member anywhere between said arm portions whereby the gap of the female profile is maintained at a consistent width upon cooling.
A process for preparing closure elements for plastic webs comprising:
- extruding closure elements including a male profile and a female profile having a base portion and arm portions with a gap therebetween;
- attaching said profiles in a formable condition to a plastic web;
- gapping said female profile in said formable condition;
- and
- cutting the base portion of the female profile.
Dependencies are inferred from the claim text.