FI82661B - Double-layered sack - Google Patents

Description

1 82661

A two-ply bag

The invention relates to double-layer bags, in particular the so-called high-sacks. These have an outer bag made of strong material and an inner bag made of dense plastic material inside.

The so-called big sacks usually have an outer sack made of sturdy fabric with carrying loops in the mouth for hanging the sack. Inside the outer bag is a tight inner bag made of suitable plastic. In some large sacks, the mouth of the inner sack is also shaped as a narrower horn-like infill than the other sack. When filling the bag, the inner bag is first pushed inside the outer bag so that the filling part is outside. The outer bag is suspended from its carrying straps, and the filling part of the inner bag is placed in the feed tube of the feeder. Prior to filling, the inner bag 15 is straightened by blowing air into it through a supply pipe. In order for the inner bag to straighten well, the blowing pressure must be as high as possible.

It is known to manufacture said inner bag in such a way that the bottom of the bag is sealed by sealing a plastic hose with a width of 20 to form a mouth part tapering at the opposite end of the hose from the edges. The inner bag thus obtained thus has two seams on opposite sides in the mouth part.

Ύ ·: In this construction, however, the seams of the mouthpiece have proven to be * ^ · * * 25 easily torn, especially when the inner bag is compressed with air: j ';

• f-; ·. It is an object of the present invention to provide a double-layer Y bag in which the filling mouth of the inner bag is stronger than in known bags. This is achieved by the means set out in more detail in the claims.

An embodiment of the invention is described in more detail below. In the drawings related to the description, Fig. 1 shows the manufacture of the mouth of the inner bag and Fig. 2 shows the large bag suspended in the filling position.

; * / · 35 The outer bag is made by cutting a desired piece of tissue hose folded inwards from the sides of the bridge, sealing one end to the base 1 and forming * at the opposite end in the mouth 2 thus formed 2 2,8661 for carrying loops. Lifting loops are made by cutting two strips on each of the mouth of the sack as an extension of the diaper on each of the wider sides of the diaper and joining the corresponding strips on opposite sides together.

5 The inner bag is made of the same size as the inner bag! from a tubular blank folded on the sides. The material used is, for example, a suitable plastic such as polyethylene. A transverse bottom seam 4 is formed in the base.

In the mouth of the inner bag, neck seams 7 are formed obliquely towards the mouth at each edge of the fold fold 6 of the pleats half-size 10 so that a filling tube 8 is formed in the mouth. The pieces outside the neck seams are removed.

The sealing is performed by placing each side 5 of each pleat separately between the jaws of a suitable sealing member.

15 This is best done simultaneously, but can also be done separately.

The seam 7 of the mouth of the inner sack is best shaped so that it starts from the edge fold 6 tangentially then curves inwards and back into the longitudinal direction of the sack of the sack, whereby the mouth part becomes bottle-shaped.

The seams 7 can be extended down to the bottom of the sack if desired. With this structure, a sack can be made of ‘·’ four or more separate strips.

When the inner bag is inserted inside the outer bag, the neck seams of the inner ‘25 bag ’remain at the corners of the outer bag 7 at the carrying loops 3 *. In this way, the outer bag protects the neck seams by preventing them from bulging outwards when subjected to pressure from the inside. In this way, the inner bag can be straightened using even strong compressed air blowing before filling.

In addition, thanks to the four neck seams 7, the filling part of the inner bag is tubular and easily retains its shape, which makes it easy to insert it into the supply pipe.

»-«

Claims (6)

A two-layer sack comprising an outer sack comprising a diaper, a base (1) and a mouth (2) and at least one lifting loop 5 (3) running from the side of the diaper over the mouth to the opposite side in the mouth; and an inner bag with a diaper, a base (4) and a mouth already formed with a filling part narrower than the diaper, characterized in that the inner bag has folds inwards on opposite sides and that the filling part (8) is formed by sealing each fold half (5). ) the walls of one of the fold folds (6) of the fold with a neck seam (7) extending obliquely to the mouth j of the sack. ! Sack according to Claim 1, characterized in that the part of the pleat half (5) outside the neck seam (7) is removed. Sack according to Claim 1 or 2, characterized in that the neck seam (7) extends substantially tangentially to the edge fold (6) of the fold. 3 82661 Sack according to one of Claims 1 to 3, characterized in that the neck seam (7) comes substantially perpendicular to the edge 20 of the mouth of the sack. A method of making a two-layer bag, the method comprising producing an outer bag having a diaper, a base (1) and a mouth (2) and at least one carrier loop (3) running from the side of the diaper over the mouth to the mouth. · an inner bag with a diaper, a base (4) and a mouth is formed, * a narrower filling part of the inner bag is formed in the mouth of the inner bag, and the inner bag is placed inside the outer bag against the bottom, characterized in that the inner bag is made of opposite sides a tubular groove by sealing the other end of the blank to the base and that the filling part (8) is formed by sealing the walls of each fold in half (5) together with a neck seam (7) extending obliquely from the edge fold (6) of the fold. • «· · A method according to claim 5, tun. • * · * 35 that all neck seams (7) are formed simultaneously. ♦ • · · »i ·· 4 82661 Patentkray