FI89889C - FOERFARANDE ATT FRAMSTAELLA EN BEHAOLLARESAECK - Google Patents

Description

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TECHNICAL FIELD. METHOD OF MANUFACTURING A TANK BAG

The invention relates to a method of manufacturing a sack for use in relatively large waste and similar collection containers.

TECHNICAL BACKGROUND

Waste and similar products are often collected in larger collection bins, which are then mechanically emptied into a collection-10 car. At present, such containers do not usually use an inner bag, and therefore the containers have to be washed quite often for reasons of hygiene. There is considerable additional work and cost involved in cleaning the tanks.

15 GENERAL DESCRIPTION OF THE INVENTION

A method of manufacturing a paper container bag has now been invented. The invention and some of its preferred embodiments are precisely defined in the claims.

The most essential thing about a sack is that the pleated sides have at least 20 two folds. In this way, the sack is made souk in relation to its cross-section and it is easy to place the sack in the container. Such a sack can also be made on normal plate sack lines by adding only a few steps.

When the container bag according to the invention is used, the contamination of the collecting containers is substantially less and thus washing of the containers is correspondingly avoided.

A sack made of uncoated wet-strength sack paper is also biodegradable and thus well suited for collecting compostable material. Correspondingly, the paper bag so-30 also serves to collect recyclable paper material.

If desired, coated paper can be used in the bag, e.g. to provide moisture impermeability. The coating is also best made of a compostable or pulpable material.

When using the fastening strips according to the invention, it is easy to fasten the bag to the container.

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DETAILED DESCRIPTION OF THE INVENTION

In the drawings of the description, Fig. 1 shows a sack according to the invention seen obliquely from above, Fig. 2 it is placed in a container and Fig. 3 its manufacture.

The bag according to the invention has a jacket consisting of a paper hose, an open upper mouth and a closed bottom.

The diaper is best formed from one layer of paper (eg ML WEX, 70 - 120 g / m2, manufactured by Yhtyneet Paperitehtaat Oy). If necessary, there may be several layers of paper.

10 The diaper has four sides: opposite flat sides 1 and opposite pleated sides 2. The width of the pleated side is preferably larger than the width of the flat side (e.g., 870 x 650 non).

The base 3 is closed by gluing. It may also have 15, for example, a Z-fold and an over-glued paper locking and sealing strip 4 to increase the liquid retention capacity.

The pleated sides 2 of the sack have two inwardly made longitudinal folds 5 and 6. If desired, folds can be made to increase the width even more.

20 At the top of the sack there are paper fastening strips 7 glued to the flat sides, from which the sack can be fastened to the container. The container may have special grippers for this purpose, such as clamps or spikes.

According to a preferred embodiment, the fastening strip 25 7 has a flexible stiffener, such as a wire 8, by means of which the strip is kept in an inverted position over the edge 10 of the container 9, see Figure 2. The fastening strip 7 preferably consists of two paper strips glued together, between which the wire 8 is placed in a corrugated manner.

In the container according to Fig. 2, the fastening strip 7 is placed under the handle part 11 of the lid (the lid is not otherwise shown).

35 The sack is made slightly higher than the tank. In this case, the material to be placed in the bag shapes the bottom and sides of the bag against the container. In this way, the sheath is not subjected to stresses due to the weight of the contents.

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The pleated side of the sack according to the figures is wider than the flat side. Also in sacks with a wider flat side, a multi-coke pleated side is useful, because the corner of the bottom then forms better in the container.

5 The bag is intended to be used as a protective bag, eg in collection containers for waste or recyclable materials, which are emptied into a collection truck. When using a sack, the contents of the tank with its sacks are poured into a collection truck. Thanks to the sack, the contamination of the tank and thus also the need to wash the tank are substantially reduced.

Paper is an easily compostable and combustible material. The use of a tank bag therefore does not harm waste treatment facilities and does not increase the amount of non-degradable waste in landfills. With the recycled paper, the sack can be re-pulped. Among metal, glass or plastic waste, a paper bag does not cause significant harm. After all, there is usually paper among them, which is removed in the reprocessing process.

The sack can in principle be made from a single web of paper. In this case, a hose with pleats is formed from the web, the hose is cut into pieces, one end of which is closed and, if necessary, the fastening strips are glued to the other end. However, the production of sacks with a larger cross - section in this way requires particularly wide production lines. It is therefore easier to make a hose from two or more webs, in which case normal-width production lines can be used, to which the necessary modifications and additions are made. Figure 3 schematically shows one such production line for manufacturing the sack of Figure 1.

{, {_ 30 The top paper web 13 is taken from the roll 12. On the folding machine 14, folds 5 are formed above the edges of the top web 13.

In the gluing group 15, glue is applied to the top of the 5 folds. A lower paper web 17 is taken from the roll 16, at the edges of which folds 6 are formed by a machine 18.

The upper web 13 is fed via a turning roll 19 to a press nip 20, to which the lower web 17 is simultaneously introduced. for the hose machine 24, where the hose is cut into sack blanks. The blanks are then formed with soles by a base machine and the fastening strips 7 are attached to the mouth.

5 When the blanks cut from the hose 24 have to be moved laterally, it is advantageous to glue the folds 5 and 6 of the front pleat side lightly together. process gluing so that the pleats do not open when moved and thus cause inconvenience. When the bag is placed in the tank and the bag is filled, the process adhesive comes off easily.

If desired, the sack can be made of moisture-resistant treated paper. The material that forms the moisture barrier is also best biodegradable.

Claims (2)

5 89889 A method of manufacturing a paper container bag, the bag having opposite planar sides (1), opposite pleated sides (2), an open mouth and a closed bottom (3), characterized in that a first paper web (12) is taken from the first roll (12). 13), folding its edges at least once first inwards and then outwards to form at least one fold (5), a second paper web (17) is taken from the second roll (16), and if only one fold (5) is formed in the first web (13) , the edges of the second web (17) are also folded at least once, first inwards and then outwards, to form at least one fold (6), the webs (13, 17) are glued together at their edges so that the formed hose (22) has inward folded folds (5, 6) , cut the hose 15 (22) into pieces and close the other mouth of the pieces to the bottom (3). Method according to claim 1, characterized in that the edges of the first web (13) are folded to form one or two folds (5, 6) and if only one fold (5) is formed in the first web (13), the second web (13) is also folded. 17) edges to form a single pleat (6). 6 89889