Multi-cavity blister package with individually accessible product windows

Abstract

A multi-cavity blister package includes a backing card. A transparent, plastic semi-rigid cover sheet co-extensive with the backing card formed with a plurality of raised portions each of which, when secured to the backing card, forms a product receiving cavity or compartment. The plastic covering is secured to the backing card to form a plurality of product receiving cavities. The backing card has perforations proximate to each product-receiving cavity to allow selective perforations to be burst to provide access to an associated cavity without compromising remaining cavities or compartments for future use.

Claims

1. Multi-cavity product package comprising a plurality of products each product comprises at least two differently shaped components required to perform a predetermined task; a generally flat backing card having predetermined dimensions and a pre-defined surface area; and a transparent plastic semi-rigid cover sheet generally co-extensive with said backing card over said pre-determined surface area, said plastic cover sheet being provided with a plurality of raised portions each of which when secured to said backing card forms a multi-component product receiving blister, cavity, chamber or compartment and each of said raised portions being thermoformed and shaped to conform to at least a portion of the surface of each component and display all of the components of each multi-component product to maintain the components of each of the multi-component products arranged in a plane substantially parallel to said flat backing card in substantially fixed positions so that all the components of each multi-component product are visible prior to removal from a selected blister, cavity, chamber or compartment thereby indicating to a user that all required components for the predetermined task are present in each blister, cavity, chamber or compartment and available to accomplish the predetermined task; means for securing selected portions of said plastic cover sheet to said backing card to form said plurality of said product receiving blisters, cavities, chambers or compartments, said backing card being provided with perforations proximate to each product-receiving blister, cavity, chamber or compartment, whereby selective perforations can be burst to provide access to an associated product receiving blister, cavity, chamber or compartment to remove all the associated components of a multi-component product contained therein without compromising said flat backing card and remaining product receiving blisters, cavities, chambers or compartments or compartments in which remaining multi-component products continue to be fully visible through a transparent raised portion for future use.

2. A multi-cavity product package as defined in claim 1, wherein said product receiving blisters, cavities, chambers or compartments are arranged in an array of rows and columns.

3. A multi-cavity product package as defined in claim 1, wherein at least one of said product receiving blisters, cavities, chambers or compartments differs in size and/or shape to accommodate different products.

4. A multi-cavity product package as defined in claim 1, wherein said at least one of said product receiving blisters, cavities, chambers or compartments differs in size to accommodate similar but different-sized products.

5. A multi-cavity product package as defined in claim 1, wherein said perforations are generally coextensive with associated product receiving blisters, cavities, chambers or compartments.

6. A multi-cavity product package as defined in claim 5, wherein said perforations are equal in length.

7. A multi-cavity product package as defined in claim 5, wherein at least a portion of said perforations are longer perforations to facilitate tearing of said perforations.

8. A multi-cavity product package as defined in claim 5, wherein at least a portion of said perforations is formed by micro perforations.

9. A multi-cavity product package as defined in claim 1, wherein said semi-rigid cover sheet is formed of PVC.

10. A multi-cavity product package as defined in claim 1, wherein said perforations are selected to provide a preselected burst strength for severing said perforations to provide access to an associated product blister, cavity, chamber or compartment.

11. A multi-cavity product package as defined in claim 1, wherein said backing card weight and perforation teeth per inch and tie widths are selected to facilitate tearing of said backing card with a pressure applied against said backing card that is at least equal to a predetermined bursting strength.

12. A multi-cavity product package as defined in claim 1, wherein means for securing comprises a heat seal.

13. A multi-cavity product package as defined in claim 12, wherein said heat seal includes selected regions between product receiving blisters, cavities, chambers or compartments.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Those skilled in the art will also appreciate the improvements and advantages that derive from the present invention upon reading the following detailed description in conjunction with the Figures in which:

(2) FIG. 1 is a perspective view of a multi-cavity blister package in accordance with the invention forming an array or matrix of cavities, chambers or compartments for storing and displaying same or similar products each individually packaged and accessible on the card;

(3) FIG. 2 is a front elevational view of the multi-cavity blister package shown in FIG. 1;

(4) FIG. 3 is a rear elevational view of the package shown in FIG. 2;

(5) FIG. 4 is a cross sectional view of the blister package shown in FIG. 2, taken along line 4-4; and

(6) FIG. 5 is a rear elevational view similar to FIG. 3 of an alternate embodiment in which the perforations along the top sides or edges, as viewed in FIG. 5, are modified from the perforations provided along the sides and bottom edges of each window or blister.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(7) Referring now to the Figures, in which the identical or similar parts are designated by the same reference or numerals throughout, and first referring to FIGS. 1-3, a multi-cavity blister pack with individually accessible perforated product windows, cavities or pouches is generally designated by the reference numeral 10.

(8) The blister package 10 is a multi-cavity blister package that includes a generally flat backing card 12 having a predefined surface area A. While the blister package 10 can assume different shapes or outlines and sizes the presently preferred embodiment is rectangular as shown in FIGS. 1 and 2 and the surface area A is equal to the product of the height H of the package and its width W.

(9) A plastic semi-rigid cover sheet 14 is generally coextensive with the backing card 12 and, therefore, also shares the same surface area A. The surface area A includes a peripheral portion 16a that extends about the perimeter of the blister package 10, the remaining area being designated by the reference numeral 16b.

(10) The plastic cover sheet may be any suitable semi-rigid plastic material conventionally used for making blister packages formed with a plurality of product containing cavities, compartments or chambers 18a, 18b, 18c, 18d and 18e in the embodiment illustrated. The product receiving cavities may be arranged in an array or matrix of rows and columns, such as three rows and five columns as shown. However, the present invention contemplates any arrangement or number of cavities on the backing card 12 consistent with the sizes of the cavities 18a-18e necessary to contain and display products P1, P2, P3, P4 and P5. At least two product receiving cavities may be used but there is no limit on the maximum number of such cavities as these will be determined by the size of the backing card 12 and the sizes of the individual cavities 14 required for housing and displaying the products. As illustrated in FIGS. 1 and 2, the cavities 18a-18e are differently sized to house and display related but different products (e.g. sizes, appearances, etc.). Thus, in the example illustrated, picture hanging hooks are shown with four of the cavities 20a housing being smallest and housing a picture hook P1 supported by a single nail, four cavities 20b housing a larger picture hook supported by a single nail, three cavities 20c housing a still larger picture hook supported by a single nail, two cavities 20d housing a larger picture hook supported by two nails and, one cavity 20e housing a picture hook supported by three nails. Package 10, therefore, is in the nature of a kit of assorted picture hooks as may be needed by a consumer for differently sized pictures or frames. The plastic cover sheet 14 is thermoformed to create raised windows 20a, 20b, 20c, 20d and 20e to accommodate products P1-P5 to be stored and displayed in associated compartments or cavities, as also shown in FIG. 4.

(11) A hang hole or cutout 28 may also be provided as is typical with such packages for hanging the packages on a peg of a display or rack.

(12) The cover sheet 14 is typically transparent and secured to the backing card 12 in any conventional manner to form the product compartments, cavities or chambers 18a-18e. For example, the transparent cover sheet may be secured along the perimeter 16a by means of a heat seal 26a. Depending on the size of the blister package 10, the plastic covering sheet may also be secured to the backing card 12 in selected regions 26b between product receiving cavities over selected portions of the remaining area 16b.

(13) The plastic coversheet, as noted, is semi-rigid and typically formed of PVC with a predetermined flexibility to allow a user to apply pressure to the raised window 20a-20e to apply pressure on the products P1-P5 to apply pressure, in turn, to the backing card 12.

(14) An important feature of the invention is the provision of perforations 24a on the backing card 12 proximate to each product-receiving cavity, chamber or compartment 18a-18e to provide individual access to an associated cavity. In this manner, selected perforations can be burst to provide access to an associated cavity to remove a product therein without compromising the remaining cavities or compartments in which product remains for future use. As indicated in FIG. 1-3, the perforations 24a are generally coextensive with associated cavities 18a-18e to form a closed outline on the backing card 12 that substantially corresponds to the size and shape of an associated cavity 18a-18e. In the embodiment illustrated the perforations 24a are uniform and define a rectangular tab, flap or strip 32 that essentially corresponds to the size and shape of an associated cavity. However, as shown the tabs 32 may be slightly oversized to facilitate opening. The rectangular perforations 24a form two opposing sides of equal lengths. In accordance with one embodiment of the invention all of the perforations are of equal lengths and selected to facilitate the bursting open of a tab or strip 32 by application of a suitable pressure by a user on the plastic covering 14 and the enclosed product to then transfer the force to the tab or strip 32.

(15) Selection of the correct perforations determines the bursting strength of the tabs or strips 32. The bursting strength, as is known in the industry, is both a function of the number of teeth per inch (TPI), tie widths (tw) or spaces between the perforations. The force that needs to be applied to the tabs or strips 32 to sever the panel along the perforations is normally termed the burst strength and is the amount of pressure needed to rupture a sheet of paper that is perforated. When a backing card is perforated the card is partially cut so that the burst strength is reduced. For any given perforated configuration the burst strength is usually expressed as TPItw=percent of hold. By changing these parameters the burst strength can be significantly changed from low to high. For example, 12-16 TPI typically provides intermediate-to-hard tear strength ideal for mailings and other applications that require a lot of handling. Medium to easy tear can be achieved with 8 TPI while 6 TPI and lower normally provides easier tear. However, the burst strength is also a function of numerous other factors besides the TPI and tie widths. Such factors include, for example, grain direction of the card stock, the type of substrate (paper, recycled board, etc.), the density and thickness of the substrate, the age of the paper, temperature and relative humidity that affects the moisture content of the paper and even the bevel of the perforated blade that forms the perforations. Those skilled in the art will know how to select these factors to provide a desired burst strength to provide both security for the products while ensuring accessibility to a selected cavity and the product(s) contained therein without compromising the cavities or compartments in which products remain. The blister package 10, therefore, allows a user to selectively access and use items or products that are needed without disturbing the remaining products contained in the yet unopened cavities for future use.

(16) Another embodiment of the invention provides different perforation configurations along one or more of the sides of the tabs, strips or flaps 32. Referring to FIG. 5, an alternate embodiment is shown in which the perforations 24a have one TPI while the perforations 24b at the top of each window have another TPI to modify the burst strength to facilitate the rupturing of the tabs or strips to facilitate tearing of the perforations along at least one of the four sides. This is a useful feature to allow a user to more easily open one or more of the tabs or strips 32 and access selected products without damaging the blister packages so that it can be preserved for future use. Micro perforations can also be used to provide weaker perforations. For example, an 8 TPI0.032 tw=0.256 or 25.6% hold. Changing the tie to 0.018 inch provides a perforation with a 14.4% hold, substantially less even though it uses the same TPI. A 32 TPI0.008 tw also has a 25.6% hold so it is essentially the same strength as the 8 TPI even though finer micro perforations are often thought of being weaker than coarse perforations. The tear strength of a 32 TPI, however, is about 25% the tear strength of the 8 TPI0.032 perforations since the tw is about 25% the size. Stated in another way, the 32 TPI is just as strong (same burst strength) but much easier to tear. Those skilled in the art will be able to select the appropriate parameters for the perforations either about the entire peripheries of the tabs or strips 32 or provide different parameters for the perforations to provide desired bursting strengths for a given blister pack type, size, product etc.

(17) The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.