Packaging spool and process for producing same
OwnerLawrence Ridgeway, James Leeinventors
Life of this patent
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Abstract
A reel or spool package has opposing sidewalls or flanges formed of the specified or appropriate substrate and connected by a core formed of a flowable material which sets or cures to harden, such as a two part expandable polyurethane foam. The foam is applied into a partition, which may be a paper ring, by an injection and metering device. The chemistry of the flowable material may be altered to change density, rigidity and flexibility as required by package stresses. The polyurethane foam is an effective adhesive medium, thereby forming the core and connecting the sidewalls to form the package.
Claims20
A method of producing a reel for packaging, comprising the steps of:
- a) forming a first sidewall and a second sidewall;
- b) placing a partition having an interior void adjacent to, and generally concentrically with, said first sidewall, wherein a perimeter of said first sidewall extends beyond an outside perimeter of said partition;
- c) filling said void of said partition with a flowable and expandable material;
- d) placing said second sidewall in a generally parallel and concentric relationship with said first sidewall and against said partition;
- e) allowing said flowable and expandable material to cure, wherein said flowable and expandable material forms a solid core, and adheres to said first sidewall and said second sidewall, thereby connecting said first sidewall to said second sidewall.
Dependencies are inferred from the claim text.