Blister Pack with Built-In Cutting Ledges

Abstract

This invention provides a blister pack comprising a base sheet having a plurality of blisters formed therein, each of which has an opening and is configured for containing a unit dose of a deformable or fragile product, with a lid sheet attached to said base sheet for covering the openings of said blisters. The blister pack further comprises a reinforcing sheet with cut-out sections that form ledges near said blister openings. Such ledges can be used for cutting the lid sheet at said blister openings and releasing the unit doses of said deformable or fragile product.

Description

FIELD OF THE INVENTION[0001]This invention relates to blister packs, especially the push-through type of blister packs for containment and dispensing of deformable or fragile articles.BACKGROUND OF THE INVENTION[0002]Blister packs have been used for containing various products such as medicine, food, cosmetics, personal cleansing products or laundry care products, while protecting such products from damage or exposure. Unit doses of such products are stored in readily accessible, individually sealed compartments (i.e., blisters) of such blister packs. Typically, a back sheet is used to seal the individual compartments in the blister packs. Each compartment can then be opened independent of any other compartments in such blister packs.[0003]In some blister packs, the back sheet can be peeled back to expose the contents of individual compartments. However, it is not uncommon for an area of such peelable sheet to tear away in such a manner as to expose more than one compartment, leavin...

AI Technical Summary

Benefits of technology

The present invention provides a type of blister pack with built-in ledges that are easy to make and can cut the back or lid sheet sealing the blisters with minimal damage or deformation. These built-in ledges make it easy to release the products from the blister packs while maintaining their shape. This makes them ideal for use with deformable or fragile products. The package is cost-effective and easy to make, while the cutting ledges are strong and effective at cutting the lid sheet with minimal impact on the product inside.

Problems solved by technology

However, it is not uncommon for an area of such peelable sheet to tear away in such a manner as to expose more than one compartment, leaving the contents in the other compartments (other than the one intended to be opened) at risk for contamination.

Therefore, such peelable type of blister packs may be undesirable.

In other blister packs, the back sheet is frangible and can be broken when the contents of individual compartments are pushed against it by application of external force thereon.

However, when the products to be contained and dispensed are elastically deformable or fragile, it is difficult to push through such products to break the back sheet without damaging or severely deforming the product.

Therefore, the push-through type blister packs may be unsuitable for housing and dispensing deformable or fragile products or contents.

However, such known internal or external cutters or openers tend to have complex structures, and to make them requires significant additional materials and complicated processing steps, which can be cost-prohibitive for certain consumer goods such as cosmetics, personal cleansing products or laundry care products.

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