DE1846180U - DEEP FOLD BAG FOR PACKING SHOE GOODS - Google Patents

Description

Deep fold sack for packing bulk goods It is known to dispose of bulk goods in plastic sacks. It is known to fill bulk goods in plastic sacks. len. If you use the better stackability due to deep folding bags, it is difficult to weld the top and bottom seams with the existing welding machines with a number of layers that change over the seam length.

It is therefore advisable to sew the plastic bags and the seam to seal with an adhesive strip. But this assumes that you have plastics used, which are sufficiently tough and have sufficient tear strength, so that they cannot tear further while sewing.

Particular difficulties arise when self-supporting, single-ply Plastic bags made of thin polyethylene film, after filling, welded by heat impulses should be. So far one has helped oneself with these sacks in such a way that one can remove the sack has welded on all sides except for a filling opening. To the filling the filling opening was heated and closed by means of a heat pulse. Disadvantageous with this method using commercially available equipment, however, there is a lack of it Strength and safety of the weld seam, which tends to burst easily. Obstructive in the case of thick films with poor thermal conductivity is still the long, for time necessary for the heat to pass to the inside of the film. With the commercially available, The outside of the foils becomes with devices that work with short-term heat impulses weakened by the pressure of the pliers, while the inside for a homogeneous connection not softened enough.

The invention has the task of creating a self-supporting plastic bag made of polyethylene film, which does not need to be welded after filling Filling opening required.

For this purpose, according to the invention, a deep-fold sack with a transverse upper head seam, a likewise transverse lower bottom seam and each with two longitudinal outer edges are used on each longitudinal side, in which between the two outer edges each have a folded edge with two fold-over surfaces, and which is characterized in that a rectangular counterpart is in the vicinity the head seam, preferably near the outer edge from the inside on all sides four weld seams connected to the bag wall and one parallel to the longitudinal axis of the sack running right next to the inner, parallel to the outer edge trending Weld attached slot is provided 'and that the one lying above the counterpart Part of the sack wall also with a parallel to the mentioned slot, directly next to the outer, parallel to the outer edge of the weld attached slot is fitted.

The one created by the counterpart in connection with the two slots After filling, the valve results in a largely tight seal against leakage of filling goods, but also against the ingress of dirt and dust. At the same time is adequate ventilation is possible after filling. It is therefore unnecessary to add additional Provide ventilation holes, which in turn are the cause of pollution Penetration of dust and residual material can be. In that the slots on the one hand in the counterpart and on the other hand in the overlying part of the bag wall within attached to the area bounded by the four welds becomes a denser one Closure of the sack is created because the two edges of the respective slot are filled State of the sack pulled flush and next to each other on the one below without any space Surface of the counterpart or under the overlying surface of the bag wall. In this way, the opening of the slot is largely closed in the filled state.

But you can also, in order to achieve absolute tightness, by taping over the outer slot in the Sack wall a penetration from moisture or dust. Read valve that made of bag wall, counterpart and the slots is formed, does not require any additional during filling or afterwards Treatment more and allows a convenient introduction of the filler neck.

In the accompanying drawings is the deep-fold sack according to the invention shown for example, namely Figure 1 shows a view of the sack, Figure Figure 2 shows a longitudinal section A-A and Figure 3 shows a cross section B-B. In Figure 4 is the valve Shown in view, in Figure 5 and 5a in section C-C.

The deep-fold sack consists of an outer wall surface 1 in the form of a tube with two longitudinal outer edges 2 and 3 or 4 and 5, one transversely upper head seam 6 and an equally running lower bottom seam 7. The sack is on the seams 6 and 7 sewn together and after sewing with an adhesive strip 8 for Sealing glued. Between the outer edges 2 to 5 there is an inner one Fold edge 9 or 10. Between the fold edge and the two associated outer edges there are two envelope surfaces 11 and 12 or 13 and 14. The position of the envelope surfaces 11 to 14 and the outer edges 2 to 5 can be seen clearly from FIG. 3.

A rectangular counterpart 15 is attached in the vicinity of the head seam 6 (Figure 4). It is made of the same material as the sack wall and is inside (Fig. 3), preferably near the outer edge, with four welds 16, 17, 12th and 19 welded in. Parallel to the longitudinal axis of the sack is next to the inner, longitudinal weld 17 in the counterpart is a parallel slot 20 attached. Parallel to this slot is in the outer wall above the counterpart a second slot 21, also next to the associated weld 19 arranged (Figure 5a). This makes it possible for the filling tube to pass through the slot 21 in the outer bag wall 1 and through the slot 20 in the counterpart below 15 to push through into the interior of the deep-fold sack for filling.

Protection claim deep fold sack with a transverse upper one Head seam, a lower bottom seam that also runs transversely and with two each longitudinal outer edges on each longitudinal side, with between the two outer edges in each case a folded edge with two cover surfaces is created, characterized in that that a rectangular counterpart (15) in the vicinity of the head seam (6), preferably near the outer edge (3) from the inside on all sides by four welds (16 to 19) connected to the bag wall (l) and with one parallel to the longitudinal axis of the bag running, directly next to the inner, parallel to the outer edge (3) Weld seam (17) attached slot (20) is provided and that the above the counterpart (15) lying part of the bag wall (l) also with a parallel to the said one Slot (21) running immediately next to the outer, parallel to the outer edge (3) running weld seam (19) attached slot (21) is equipped.