FI85961C - SAECK. - Google Patents

Description

85961 5

BAG - BAG

The present invention relates to a sack according to the preamble of claim 1.

Today, the paper layers of paper bags are made by bending the paper webs into a hose in a forming machine of a tubing machine so that the different paper layers adhere to themselves at their edges. The bottom and mouth of the sack are made on bottom machines. The plastic inner layer 10 is made by heat-sealing the plastic layer with a longitudinal seam and a cross-seam at the bottom of the sack and often also at the mouth of the sack. Heat sealing causes an extra work step for the manufacture of the sack and thus complicates its manufacture.

It is an object of the present invention to obviate the above drawbacks. The characteristic features of the sack according to the invention are set out in the claims. By means of the invention, the manufacture of a sack with a plastic inner layer can be simplified, since the plastic layer no longer needs to be heat-sealed separately.

In the following, the invention will be described in more detail by way of example with reference to the accompanying drawings, in which 25

Figure 1 shows the formation of a planar hose.

Figures 2a and 2b show a sack according to the invention.

Fig. 1 shows a simplified formation of a flat hose in a forming machine 1 of a hose machine. The hot melt adhesive is fed before the forming table. The finished plastic hose ·; · 8 from the roll, which forms the inner bag, is fed into the paper webs 2 85961 under the rear rollers 4 before the paper webs are bent. The paper layers and the plastic layer are glued together in the transverse direction of the bag with self-adhesive dots.

5 The sack is primed in the bottom machine according to the desired bottom cut by priming the plastic inner bag together with the overlying layers of paper without heat sealing. Figures 2a and 2b show the bottom and mouth of a sack made in accordance with the invention as seen from the inside. The bottom has two layers of paper 9 and 10 and a layer of plastic 11 folded together and glued together as shown in the figure. The mouth of the sack is likewise folded and glued with layers of paper 12 and 13 and a layer of plastic 14. A valve is formed on the other edge of the mouth from a paper tube 15. 15 The base and mouth can be reinforced by gluing a paper or other reinforcement to the outside.

It will be clear to a person skilled in the art that the various embodiments of the invention are not limited exclusively to the above-mentioned example, but may vary within the scope of the claims set out below.

Il

Claims (2)

3 85961 A sack having at least one tubular paper layer and at least one tubular plastic layer inside it, the other end of the tubular paper layer being primed to form the bottom (9, 10) of the sack by folding it according to the desired bottom cut, characterized in that the plastic layer (11) ) is primed without heat sealing by folding the plastic layer together with the paper layer to form the bottom of the 10-ground sack. A sack according to claim 1, wherein the other end of the tubular paper layer is primed to form a closed mouth (12, 13) 15 with a valve opening (15) by folding it according to the desired bottom cut, characterized in that the plastic layer (14) is primed without heat sealing by folding the plastic layer together with a layer of paper to form the mouth of the sack. 4 85961