초록 ▼

Flexible packaging material suitable for making peelable form-fill-seal packages of the “pillow”type comprises a paper web which is coated with a normally non-tacky pressure- or heat-activatable adhesive and which is treated with a composition having release properties with respect to the adhesive,

Flexible packaging material suitable for making peelable form-fill-seal packages of the “pillow”type comprises a paper web which is coated with a normally non-tacky pressure- or heat-activatable adhesive and which is treated with a composition having release properties with respect to the adhesive, e.g. by means of a size press. The release composition is preferably a polysiloxane, an organo-chromium stearate complex, a ketene dimer or a paper fluoridizing agent.

대표청구항 ▼

A method of packaging a fill material comprising the steps of: providing a continuous paper web impregnated with a release composition whereby said release composition is present on a surface of said web, the release treated surface being coated with an adhesive which is substantially non-tacky at a

A method of packaging a fill material comprising the steps of: providing a continuous paper web impregnated with a release composition whereby said release composition is present on a surface of said web, the release treated surface being coated with an adhesive which is substantially non-tacky at ambient temperature and in the absence of pressure and forms a strong initial bond immediately on activation when two portions of said adhesive coated surface of said paper web are bonded together with adhesive coated surface in contact with adhesive coated surface, said release composition present on said surface of said paper web rendering said paper web releasable with respect to said adhesive whereby two portions of said adhesive coated surface of said paper web bonded together with adhesive coated surface in contact with adhesive coated surface may be peeled apart at an interface of said adhesive and said release treated surface of said paper web; dispensing a quantity of fill material adjacent a first portion of said paper web; and, bonding a second portion of said paper web to said first portion to include the fill material and to form a closed package having closures peelable at an interface of said adhesive and said release treated surface of said paper web by bringing an adhesive coated surface area of said second paper web portion into contact with an adhesive coated surface area of said first paper web portion and bonding said adhesive coated surface areas together by activating said adhesive at said areas. A package formed by the process of claim 1 or 2. A package made in a vertical form, fill, seal process, said package comprising: a single piece of a paper web impregnated with a release composition whereby said release composition is present on a surface of said web, the release treated surface being coated with an adhesive which is substantially non-tacky at ambient temperature and in the absence of pressure and forms a strong initial bond immediately on activation when two portions of said adhesive coated surface of said paper web are bonded together with adhesive coated surface in contact with adhesive coated surface, said release composition present on said surface of said paper web rendering said paper web releasable with respect to said adhesive whereby two portions of said adhesive coated surface of said paper web bonded together with adhesive coated surface in contact with adhesive coated surface may be peeled apart at an interface of said adhesive and said release treated surface of said paper web; and, said single paper web piece having first and second portions bonded together with an adhesive coated surface area of said first portion of said paper web piece bonded to an adhesive coated surface area of said second portion of said paper web piece, the bond being peelable at an interface of said adhesive and said release treated surface of said paper web. Flexible packaging material suitable for use in a vertical, form, fill, seal packaging process to produce packages of the pillow type, comprising: a paper web impregnated with a release composition whereby said release composition is present on a surface of said paper web, the release treated surface being coated with an adhesive which is substantially non-tacky at ambient temperature and in the absence of pressure and forms a strong initial bond immediately on activation when two portions of said adhesive coated surface of said paper web are bonded together with adhesive coated surface in contact with adhesive coated surface, said release composition present on said surface of said paper web rendering said paper web releasable with respect to said adhesive whereby two portions of said adhesive coated surface of said paper web bonded together with adhesive coated surface in contact with adhesive coated surface may be peeled apart at an interface of said adhesive and said release treated surface of said paper web.