초록 ▼

A packing container of the non-returnable type is frequently manufactured from laminated material which comprises a central carrier layer of paper with thermoplastic layers applied to both sides. As an opening arrangement, a pre-punched pouring opening is used which is covered on the one hand by a t

A packing container of the non-returnable type is frequently manufactured from laminated material which comprises a central carrier layer of paper with thermoplastic layers applied to both sides. As an opening arrangement, a pre-punched pouring opening is used which is covered on the one hand by a tear-off cover strip located outside the packing container and, on the other hand, by an inner protective strip. A method for sealing an emptying opening in accordance with the invention ensures that a part of the inner protective strip corresponding to the shape and size of the pouring opening accompanies the cover strip since the strips are heat-sealed to each other at the same time as they are pressed against each other by means of pressure fluid. An arrangement for carrying out the method comprises a heating device with a heatable zone and an outlet for pressure fluid.

대표청구항 ▼

A method for sealing two thermoplastic layers on an emptying opening provided in a packing material, said thermoplastic layers located on opposite sides of the opening and sealed to each other by means of heat and pressure including the steps of: positioning one of said two layers against the remain

A method for sealing two thermoplastic layers on an emptying opening provided in a packing material, said thermoplastic layers located on opposite sides of the opening and sealed to each other by means of heat and pressure including the steps of: positioning one of said two layers against the remaining layer of fluid pressure, heating the two layers in a first heating region and a second heating region, intensifying the heating in the second heating region to a substantially higher degree than the first heating region substantially concurrently with said positioning. An arrangement for sealing two thermoplastic layers on an emptying opening provided in a packing material, said thermoplastic layers located on opposite sides of the opening and sealed to each other by means of heat and pressure, comprising: a heating device defining a first working surface; a support tool provided with a second working surface, said first working surface being movable towards and away from said second working surface, said heating device defining a limited heating zone and being heatable within said zone, the limited heating zone including two heating regions; a first heating region spaced from the emptying opening and a second heating region, said second heating region defining an area of intensive heating so as to heat the thermoplastic layers to a substantially higher degree than said first heating region, the heating device provided with a fluid passage for a pressure medium.