RU2497733C2 - Paper bag for packaging bulk materials - Google Patents

Abstract

FIELD: packaging industry.

SUBSTANCE: bag is made of several layers of bag paper, connected using adhesive to form the tube and includes a bottom and a top formed by folding the edges, side surfaces with lateral folds and a charging valve. The bottom and the top of the bag are additionally reinforced with reinforcing paper strips, and the lateral fold is a vertical crease that passes into the triangular creases, adjacent to the bottom or the top of the bag. At that the charging valve is made in the form of glued paper tube which is glued into the top of the bag, and the end of the charging valve should be beyond the boundary of the lateral fold.

EFFECT: invention provides a simplified design while maintaining the necessary tightness.

3 dwg

Description

FIELD OF THE INVENTION

The invention relates to packaging containers for bulk materials and can be used in the construction, mining, chemical and other industries related to the packaging of bulk materials.

State of the art

Known paper bag for coarse bulk materials (patent for invention No. 2202, publ. 01/31/1927), consisting of several layers of paper forming a tube, fastened at the ends with a seam or staples, without bending the edges of the paper. To strengthen the seams of the bag used tape. For filling with bulk material, the paper bag has a valve in one of the corners, formed by bending the corner of the bag inward.

A disadvantage of the known paper bag is the insufficient strength of the connecting seams of the bag.

Known paper bag with a filling valve for fine bulk material (patent for invention No. 20438, publ. 04/30/1931), characterized in that its three angles (except for the angle equipped with a filling valve) are folded twice according to a certain pattern (an additional kind of kink) . The bottom is equipped with a filling valve and can be reinforced with brackets and covered by a glued strip, in addition, both sides of the bottom can be glued together.

A disadvantage of the known bag is the complexity of the design of the bag.

Known paper bag for bulk materials (patent for the invention of the Russian Federation No. 2067546, publ. 10.10.1996), consisting of several layers of bag paper. The intermediate layers are shortened along the height of the bag on one or both sides and are located between the non-shortened outer layers. The bottom of the bag is formed by a fold on which a creped tape is sewn, stitched with a seam. After filling the bag with bulk material, the neck of the bag is formed similarly to the bottom.

A disadvantage of the known bag is the inconvenience of its use, due to the need to include technological operations to form the top of the bag in the process of packing bulk material.

Known packaging for bulk products (RF patent for the invention No. 2196090, publ. 10.01.2003), having the form of a bag or bag. An emptying hole may be formed to extract contents in the transition region between one of the closed ends and the narrow side wall of the package adjacent to it. In the region of the other diagonally opposite closed end of the package, a holding device of flexible material is provided, usually located inside the outer contour of the bag. To retrieve the contents, the holding device, however, can be pulled out with an external part forming a handle that contributes to the eruption.

A disadvantage of the known packaging is its design complexity.

The closest in technical essence to the claimed paper bag for packing bulk materials - the prototype - is a bag with side bends for packing bulk products (patent for the invention of the Russian Federation No. 2175630, publ. 10.11.2001), in which on both sides of the inner edge of the fold from the front and the back walls and the halves of the side fold adjacent to them, two angular triangular valves are formed. The valves are designed to bend outward and attach to the rear and front walls. The bottom of the bag has a rectangular shape and is closed with lateral folds. U-shaped handles are glued at the top of the bag between the layers of paper. The design of the bag provides secondary closure of the opening for rash after removal of part of the product.

A disadvantage of the known bag is the complexity of the design of the bag, the high complexity of its manufacture, as well as the relative low quality and reliability of the connecting seams, which do not always ensure sufficient tightness of the package.

Disclosure of invention

The basis of the invention is the task of creating easy-to-manufacture and durable packaging for filling bulk material, providing high labor productivity in packaging work. Such packaging should also provide the necessary tightness when loading and transporting finely divided bulk material.

The technical result is to simplify the design of a paper bag for packaging while maintaining the necessary tightness for finely divided bulk materials, increasing productivity both in the manufacture of the bag and during packaging work.

The specified technical result is achieved in that the paper bag for packaging contains a bottom and top formed by folding edges, side surfaces with lateral folds and a filling valve, and according to the invention, the bag for packaging consists of several layers of bag paper connected by adhesive to a tube; the bottom and top of the bag are further reinforced with reinforcing paper strips; the lateral fold is a vertical fold turning into triangular folds adjacent to the bottom or top of the bag; the filling valve is a small glued paper tube glued to the upper part of the bag, and the end of the filling valve should extend beyond the boundary of the side bend.

Brief Description of the Drawings

Figure 1 - diagram of a General view of a paper bag for packaging bulk materials.

Figure 2-3 is a diagram of the tooling used in the manufacture of the paper bag, figure 2 is a diagram of the tooling used in the manufacture of the base and bottom of the bag, figure 3 is a diagram of the tooling used in the manufacture of the top of the bag with a filling valve.

The implementation of the invention

On the diagram of the General view of a paper bag (figure 1) are indicated: connecting seam 1, the bottom 2 of the bag, the top 3 of the bag, filling valve 4, reinforcing paper strip 5.

A paper bag for packing bulk materials consists of several layers of bag paper connected with glue to a tube (bag base), the bottom 2 and top 3 of the bag are formed by folding the edges of the paper. In order to strengthen and prevent tearing of the bag, as well as to increase the impermeability of the seal for bulk materials with fine grain size, the bottom 2 and top 3 of the bag are additionally reinforced with reinforcing paper strips 5. The reinforcing paper strips 5 are glued after forming the bottom 2 of the bag and gluing the fill valve 4 The bag has lateral folds (shown in thin solid lines in FIG. 1) defining the bulk shape of the bag. To fill with bulk material, the paper bag has a check valve 4 glued to the top of the bag. The filling valve 4 is a small glued paper tube.

Tooling 6 for the manufacture of the base and bottom 2 of the bag (figure 2) is a box in the form of a rectangular parallelepiped.

Tooling 7 for the manufacture of the top of the bag with a filling valve (Fig. 3) is a box in the form of a rectangular parallelepiped or cube, and the front face of the box is absent, and a slot 8 is made on the upper face of the box.

A paper bag for packaging bulk materials is made as follows.

The basis of the paper bag is made: several layers (usually 3-4) of bag paper are folded into a tube and connected with glue. Preferably, the connecting seam 1 is located on the front or rear surface of the bag, but not on the side.

Then, using technological equipment 6, the bottom 2 of the bag is formed. First, the side surfaces of the bag are bent, and then the front and back surfaces are bent and glued to the side surfaces and to each other. A reinforcing paper strip 5 is glued on top of the finished bottom. Then, a vertical fold is bent on the side surfaces of the bag, which is part of the side fold. The formation of the other part of the lateral fold in the form of a triangle adjacent to the bottom (or top) of the bag is carried out using technological equipment 7. The blank of the paper bag is inserted into slot 8 and several times smoothly moves up and down until it stops at the bottom (or top of the bag). During this process, lateral folds of the bag are formed.

Then the bag blank is inserted into the slot 8, so that the finished bottom 2 of the bag is at the bottom. The manufacture of the top 3 of the bag is carried out on the upper edge of the technological equipment 8. First, the side surfaces of the bag are bent, then a filling valve is glued to one of the side bends, and the end of the filling valve (indicated by a dashed line in Fig. 1) should slightly extend beyond the boundary of the side bend (indicated by a dashed line).

This design of the claimed paper bag does not require air supply when packing bulk materials, due to the fact that it is voluminous. As a result, the air supply unit may be excluded from the design of the mixing and packaging device for such mixtures. An empty bag is very convenient for storage and transportation, as it is flat when folded.

Thus, as a result of the implementation of the claimed invention, simplification of the design of the paper bag for packaging is achieved while maintaining the necessary tightness for fine bulk materials, increasing productivity both in the manufacture of the bag and during packaging work.

Claims (1)

A paper bag for packaging, comprising a bottom and a top formed by bending the edges, side surfaces with lateral folds and a filling valve, characterized in that the bag for packaging consists of several layers of bag paper connected by adhesive to a tube; the bottom and top of the bag are further reinforced with reinforcing paper strips; the lateral fold is a vertical fold turning into triangular folds adjacent to the bottom or top of the bag; the filling valve is a glued paper tube that is glued to the top of the bag, and the end of the filling valve should extend beyond the lateral fold.

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