초록 ▼

A tamper evident closure and package including a resealable closure (10) for closing, opening and reclosing a container, color changing means (32a in FIGS. 1-6) which effect a color change upon stretching, and coacting mechanical means (24, 36, 44 and 46 in FIGS. 1-6) for uncapping and recapping the

A tamper evident closure and package including a resealable closure (10) for closing, opening and reclosing a container, color changing means (32a in FIGS. 1-6) which effect a color change upon stretching, and coacting mechanical means (24, 36, 44 and 46 in FIGS. 1-6) for uncapping and recapping the closure 10 and for stretching the color changing means (32a) which clearly and unequivocally indicate the condition of the package, e.g., open or closed. Where legends, or other well defined indicia, indicating opening is desired, the color changes can be localized in the skirt by providing thin sections (32a) which stretch preferentially and adjacent thicker sections (38) which remain substantially unstretched. The thin sections (32a) for example can be a legend, or alternatively the thick sections (38) can be the legend while the thin sections (32a) provide a suitable background. The color changes employed by the invention can be accomplished by such phenomena as stress whitening inherent in various plastic materials. Alternatively, the color changes can be accomplished by mechanisms such as the use of encapsulated staining or coloring agents incorporated in a suitable matrix.

대표청구항 ▼

A tamper evident cap for a container having an opening for dispensing its contents and engaging means about the opening, comprising a resealable substantially rigid cap for closing, opening and reclosing the container having a portion of plastic with a recess therein which forms a thin section about

A tamper evident cap for a container having an opening for dispensing its contents and engaging means about the opening, comprising a resealable substantially rigid cap for closing, opening and reclosing the container having a portion of plastic with a recess therein which forms a thin section about which is a thicker section, wherein said thin section stretches preferentially upon the application of tensile stress thereto to effect a color change in the cap, and mechanical means thereon adapted to engage the engaging means to the container and coact therewith to preferentially stretch said thin section to effect a change in color for indicating the condition of the container.