FI78863C - FOERFARANDE FOER ATT FRAMSTAELLA EN OEPPEN SAECK, SAECKAEMNE OCH OEPPEN SAECK. - Google Patents

Description

1 78863

Open sack manufacturing method, sack blank and open sack

The invention relates to a method of manufacturing an open bag, in which a carrying handle is formed in the mouth of the bag. The method is particularly suitable for the production of portable paper bags, for example waste bags or shopping bags.

One way to make the carrying handle in the mouth of the bag is to first glue different reinforcement strips to the outer or inner surface of the diaper or between the layers of the multilayer diaper to reinforce the mouth portion. A hole acting as a handle is then cut through the reinforced mouthpiece in a suitable manner.

Another way is to glue the inverted U-shaped handle part to the mouth part of the bag.

Various combinations of the above methods are also used.

15 In the production of large quantities of paper bags, a bag machine is used in which the paper web is first formed into a web-oriented, single-layer or multi-layer hose from which blanks the length of the bag to be manufactured are cut. The blanks are fed transversely to the trajectory of the machine in the so-called to the base-20 forming portion, where one end is formed by gluing or sewing to one end of the blank or, in the manufacture of a valve bag, to each end. When it is desired to make a carrying handle for sacks made by this manufacturing process in one of the ways described above, it is done in a separate operation, usually in a separate, off-sack device, where the handle is formed and attached to a single sack blank. Thus, making the handle has become relatively expensive. In addition, many known handle solutions have been quite weak in structure.

The object of the present invention is to provide a manufacturing method which is particularly suitable for paper sacks, with which sacks with a strong carrying handle are rationally obtained.

With respect to the features of the invention, reference is made to the claims.

Some embodiments of the invention are described in more detail below. In the accompanying drawings, Figures 1 to 4 schematically illustrate a paper bag manufacturing process.

2 78863

Figure 1 shows a single or multi-layer web 1 from which a hose is formed by bending and securing the edges together. The direction of travel of the track is illustrated by an arrow.

Before forming the hose, two pairs of longitudinal reinforcing strips 2 and 2 'and 3 and 3' of the web are attached to the web so that in the formed flattened hose the strip pairs are in the middle on opposite sides of the hose. Alternatively, the pairs of strips can be run on a web that has already been formed into a hose. The pairs of strips are run on the web in the longitudinal direction-10 sa always at the distance of two sack blanks from each other.

Once the hose is formed, it is cut into two sachet-length pair blanks 4 (Fig. 2) so that the pairs of strips 2 and 2 'and 3 and 3' face each other in the middle of the pair of blanks. The blank is now fed transversely to the path direction and bottom seams 5 and 5 'are formed at the ends. The transverse direction of movement is indicated by an arrow in Figure 2. At the same time, transverse reinforcing strips 6 and 6 'extending transversely from the edge of the blank to the edge of the blank are glued to each side of the pair of blank strips. Carrier holes 7 and 7 'are formed in the area surrounded on three sides by the longitudinal or transverse strips, preferably so that the upper edge of the hole is at the lower edge of the transverse strip and the sides of the hole are at the side edge of the longitudinal strips.

The transverse reinforcing strips 6 and 6 'are glued in particular so that the glue enters only in the area between the inner edge of the longitudinal reinforcing strips 2 and 2' and 3 and 3 'and the edge of the preform. In the case of the longitudinal reinforcing strips, the adhesive seams 8 and 8 '(Fig. 4) are further formed so that the upper edge of the adhesive joint extends to the inner edge of the longitudinal strip and the lower edge of the adhesive joint extends to the outer edge of the longitudinal joint.

Finally, the pair blank 9 thus obtained (Fig. 3) is cut in the middle between the transverse reinforcement strips, whereby two sacks 10 are obtained (Fig. 4).

The manufactured sack has double reinforcement at the upper corners of the carrier holes, which are particularly critical for tearing. The non-glued transverse strip between the longitudinal strips facilitates the formation of a hole into a hand-friendly handle. The oblique inner edge of the gluing seam, on the other hand, distributes the stress on the end of the seam more evenly over a longer area, thus preventing the formation of a tear point.

The method described from the manufacturing technique is advantageous, since it can be carried out in connection with a normal bag machine by connecting to it simple accessories known per se. It is particularly advantageous that reinforcing strips made of straight web material can be used and fastened in the direction of travel.

The reinforcing tapes are suitably paper, but they can also be some other well-adhering material.

The transverse reinforcing strips can, if desired, be left loose between their attachment points, forming a longer, strap-like handle.

If desired, the transverse reinforcement strips can also be attached along their entire length.

The transverse strips may also consist of a single wide strip extending from one carrier hole to another, from which a transverse strip is formed in the mouth of each sack when the pair-20 is cut.

A pair of longitudinal strips can also be formed from a single wide strip through which a carrier hole is formed.

The longitudinal strips can, if desired, be extended up to the bottom of the sack. The carrier hole can also be formed during longitudinal travel so that it reaches up to the mouth of the finished sack. In this case, the upper edge of the handle hole consists only of a transverse strip.

Longitudinal strips can also be formed on the inside of the sheath or in multilayer bags between the layers of the sheath.

The sack can, of course, be made with or without a side fold.

Claims (10)

A method of manufacturing an open sack with a carrying handle, comprising forming a hose from a paper web (1) by bending and securing the edges of the web together, cutting the hose into lengths of a fastening strip and fastening strips above the carrier hole and to the side, characterized in that a longitudinal reinforcement strip (2, 2 '/ 3, 3') extending above the top edge of the carrier hole is attached to the web or hose on both sides of the carrier hole (7) to be formed on the side of the bag, then a transverse reinforcement strip (6) is attached to the longitudinal reinforcement strips 15 above the carrier hole of the sack. Method according to Claim 1, characterized in that the transverse reinforcing strip (6) is fastened while closing the base with a bottom seam (5). Method according to Claim 1 or 2, characterized in that two separate longitudinal reinforcement strips (2, 2 * / 3, 3 ') are attached to the side of the sack. Method according to one of Claims 1 to 3, characterized in that the hose to which the longitudinal reinforcing strips (2, 2 '/ 3, 3') are attached is first cut into two two-bag-long pairs (4) so that the longitudinal reinforcing strips are in the middle of the blank, after which each end of the preform is closed with a bottom seam (5, 5 ') and the transverse reinforcing strips (6, 6') are fastened and then the thus obtained blank (9) is cut in the middle into two sacks (10). 4 78863 Method according to Claim 4, characterized in that a separate transverse reinforcement strip (6, 6 ') is attached to each sack of the preform (4). Method according to one of Claims 3 to 5, characterized in that the transverse reinforcing strip (6) is fastened by means of an adhesive seam and that the transverse reinforcing strip in the area between the longitudinal reinforcing strips (2, 2 ') is not fastened to the sack. 5 78863 Method according to Claim 6, characterized in that, in the case of the longitudinal reinforcing strips (2, 2 '), the transverse reinforcing strip is fastened by an adhesive seam (8, 8'), the oral edge 5 of the adhesive seam extending beyond the center of the side. the bottom edge of the adhesive seam sack. A sack blank formed by cutting a paper material from a hose, characterized in that it (4) is the length of two sacks and has two 10 longitudinal reinforcement strips (2, 2 ') in the central part on the side. A blank according to claim 8, characterized in that it further has a transverse reinforcing strip (6, 6 ') on each side of the transverse center line of the blank on each side of the transverse center strips (2, 2') and that each end of the blank is closed by a bottom seam (5). , 5 '). 10. An open sack with a closed bottom and an open mouth and a side-to-side reinforced carrier hole (7) extending through the sack in the mouth part, characterized in that the side of the sack has a longitudinal reinforcement strip (2, 2 ') on each side of the carrier hole and longitudinal reinforcement strips above the carrier hole. on top of the transverse reinforcement strip (6). 6 78863