SU1726317A1 - Method of sealing rectangular box filled with liquid product - Google Patents

Abstract

Use: sealing of rectangular boxes made of cardboard, coated on the surface with thermoplastic material when packaging liquid products, mainly milk. SUMMARY OF THE INVENTION: Rectangular bridges and triangular valves are formed on the bottom and the lid of the box. When valves are formed, the product is expelled from the cavities of three of them. Then sections 8 of these valves adjacent to the ends of the box are welded at the bend lines with sections 9, 10 adjacent to the jumpers. After that, the triangular flaps of the lid are folded back and welded to the side edges of the box, and the bottom flaps are folded back and welded to the bottom. 3 il.

Description

This invention relates to the packaging and packaging industry, namely to milk packaging.

A packaging container for liquids, such as milk, made of cardboard with a thermoplastic coating and containing side edges, a bottom and a cover is known. The manufacture of this packaging container provides for the formation of triangular valves on the bottom and cover, bending and welding of the bottom triangular valves to the bottom, and the cover triangular valves to the lateral face m.

A disadvantage of the known packaging container is that in the manufacture of closures of the lid and bottom in the cavities of the triangular valves there remains a packaged liquid product that cannot be removed from the container when the product is drained through a tear-off valve.

The purpose of the invention is to reduce the loss of the box filling product.

To achieve this goal, according to the method of sealing the filled

when forming valves, the liquid product of the rectangular box displaces the product from the cavities of three of them, after which the sections of these valves adjacent to the ends of the box are welded at the fold lines with the sections adjacent to the jumpers.

FIG. 1 shows an isometric image of a rectangular box; in fig. 2 is an isometric view of a rectangular box before folding off the triangular flaps; in fig. 3 is a blank for a rectangular box.

The rectangular box is formed from a cardboard blank with folding lines which facilitate the folding. On the inside and outside of the cardboard blank has a thermoplastic coating, for example, polyethylene.

The rectangular box consists of the front sides 1, the rectangular tank faces 2 and 3, the triangular valves, the cover and the bottom. The end sides 1 adjoin the rectangular portions 4 and 5 of the lid and so on.

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Coal sections 6 and 7 of the bottom. To the lateral face m 2 and 3 adjacent areas 7, 9 and 10 triangular valves. Narrow rectangular portions 11 and 12 of the bridges adjoin sections 4 and 5, 6 and 7, and small rectangular portions of the bridges 13 and 14 adjoin small triangular sections 9 and 10 of the rectangular box (Fig. 3). “Formed into a pipe with a welded lower end (that is, with a bottom of the box formed by a jumper) and filled with a liquid product. At first, the bottom lintels of the subsequent box and the lid of the box being manufactured are formed by pressing together 11 and 12, 13 and 14 rectangular sections and their subsequent welding. The box is then separated from the pipe and triangular valves are formed on the bottom and on the lid by bringing together 8 sections of triangular valves with triangular sections 9 and 10. During the formation of triangular valves, the liquid product is displaced from the cavity of triangular valves by molding blocks 16 and 17. For so that the liquid product does not fall into the cavities of the triangular valves again, the elements 18 are welded (in section 15 along the fold line) sections 8 of triangular valves with triangular sections 9 and 10. To open the packaging more conveniently brew one of the triangular flaps do not cover derivatives m. Thereafter, the bottom valve triangular folded and welded to the bottom, and the triangular valve cover are folded and welded to the side faces 2 and 3 m.

All the above sections are welded by heating the elements to be welded and pressing them together.

When using a pack, the non-welded triangular valve of the lid is detached from the side wall, its tip is cut off and the contents are poured. Due to the fact that there is no liquid product in the cavities of the remaining triangular valves, all the packaged liquid product is easily removed from the package.

Claims (1)

Claims The method of sealing a rectangular box filled with a liquid product, made of cardboard, coated on the surface with a thermoplastic material, involves forming rectangular bridges and triangular flaps on the bottom and lid of the box, bending and welding the flaps of the lid to the side edges of the box, and valves the bottom - to the bottom, characterized in that, in order to reduce the loss of the product filling the box, when the valves are formed, the product is expelled from the cavities of three and them, after which portions of the flaps adjacent to the ends of the box is sealed at the fold lines with the area adjacent to the bridge. fieL 12 13 14 / .//. / Jljil / 13 /four / 12 /    / one 15