RS54137B2 - Plastic film bag - Google Patents

Description

Description

The invention relates to a bag according to the main term of claim 1 of this patent. Such bags are known from patents EP 2113470 A or DE 3508123 A. The bags referred to there are usually used for light piece material such as, for example, rolls of toilet paper or the like, and for which it is necessary to add (at least) one handle because they are large in volume and difficult to handle. Such bags are already in line with the principles of saving material costs, but also with the pressure of public interest to reduce waste, as well as with the general trend of thinner and thinner plastic films, with the thickness of the film today being 40 μm or even less.

In terms of strength, the reduced wall strength can be compensated by a material that is more resistant to stretching, in order to withstand the loads, especially during the machine filling of these bags. But certainly the boundary of the inner space between the inner space for filling and the grip handle, which is usually realized with a sealed seam, is problematic. Due to the decrease in the strength of the foil, the sealed seams are definitely becoming more and more problematic, because the thin foils that lie on top of each other are joined by melting, but are not fused into a separation seam, so they separate. Bags, produced with the usual lower film thickness, where the gripper handle, usually as a two-layer strip of uniform width, is separated from the inner space for filling by a sealed seam, and on the outside, parallel, limited by a separating seam, are subject to the risk that during machine filling, due to the pressure of filling the goods, and especially due to the density of the opening of the expansion tool, the sealed seam between the inner space and the handle will break. catching and thus damaging the filled bag.

The task of the present invention is to produce a bag, as described here, with an inner space for filling and a grip handle in a form that can be made from a thin plastic film, which can be joined with a sealed seam, whereby the bag is strong during filling and use, and especially in the transitional part between the inner space for filling and the grip handle, i.e. resistant, and can be produced without large technical investments, in the usual way.

According to the invention, the task is solved by a bag according to the main term of claim 1, according to the specified features of claim 1.

It has been shown that a split seam, as used on the outer edge, can be made to withstand a much higher load than a sealed seam at a reduced thickness of the foil, especially if the thickness drops below 40 μm. Furthermore, it was shown that the critical loads occur at the ends of the boundary of the internal space for filling, where the tool for filling ie. for expansion and the goods used for filling cause traction forces.

This modification of the bag, whereby the outer edge of the grab handle, formed by the separation seam, approaches the border of the internal filling space, provides improved rigidity of the bag compared to a conventional full-length sealed seam.

This improvement can be achieved by conventional means and, therefore, without large investments, since the separation seam has been applied as a final seam until now. However, it now takes on a continuous shape, which at the handle opening appropriately deviates from the internal filling space, which otherwise conforms to the boundary of the internal filling space. In contrast to the usual constant-width grab handle, the continuous shape also allows for waste residues that can be removed or vacuumed without great expense.

At the same time, the separation seam can be completely close to the usual sealed seam itself, and especially to the sealed seam that extends straight along the entire length, in order to

the sealed seam strengthened from tearing ie to prevent critical tearing of the sealed seam in the second line.

A split seam here replaces a sealed seam.

Further embodiments of the invention arise from the patent claims.

The only image of the drawing shows a bag according to the invention, in partial section, folded flat and ready for sale.

The bag, marked with number 1 in the drawing, made of plastic film whose thickness is less than 40 μm, is presented in a flat, unfilled state, with the front side 2 and the back side 3 interconnected on the one side by a side flap 4 in the shape of the letter W, and on the other side they end open, with different end edges 5, 6. The empty bag 1 in its flat, unfilled position should be continuously made from the "endless" double-laid strip of foil, which in the picture extends upwards and into which the side flap 4 is inserted, before the separation occurs on the opposite side with separation seams, such as the straight, transverse separation seam 7 and the continuous separation seam 8. Contour line 9, side contours 10 and 11, hints at the contours of the previous bag.

The side flap 4 in the shape of the letter W gives the bag, when properly filled, a bordered cube shape. Without the side flap 4 - limited by the front side 2 and the back side 3 by a sealed seam - the bag would completely adapt to rounded filling contents like cellulose rolls or the like.

Bag 1 has a grip handle 12 with a handle opening 13. The opening 13 of the handle in this case is not shaped as a recess, but as a tab with an edge in the form of an open ring (the shape of the letter C), in the form of a separating seam 14 which then mutually connects the surfaces of the foil on the inside along the opening 13 of the tab-shaped handle, as well as on the outside of the handle 12 for gripping. It goes without saying that the edge contour can also be made by stamping, whereby the foil layers, which are located one above the other, remain unconnected.

The gripping handle 12, in which the foils are located flat on top of each other, is separated from the inner space 16, where the foils for receiving the contents for filling are separated from each other, by the border 15 of the filling of the inner space, which, more for reasons of conceptual distinction, is also drawn in the edge areas at a small distance from the separation seam 8, while in fact it coincides there with the separation seam 8. The interior space 16 for filling extends parallel to the separation seam 7, which is an advantage both for cutting out the bags during production and for filling. The inner space 16 for filling then extends between the separation seam 7 and the border 15 of the inner space for filling in the (vertical) direction and from the outer edge 17 of the side flap 4, which expands during filling, up to the border 18 of filling, from where the foils after filling are stretched approximately in the shape of a cube and joined along the line 19 of the seam with a separating seam. After closing the bag 1, the remaining part (for handling) with holes 20 intended for stacking falls off.

While the usual grab handles for bags of this type were of the same width in all parts, which closed without waste ends the entire space between the contour line 9 of the previous bag and the border 15 of the inner space for filling, which has the role of both the handle and the bag itself 1, the bag according to this invention, in the area of the grab handle, is shaped in a special way. This design foresees that the separation seam 8 in the longitudinal sections on both sides of the opening 13 of the handle approaches the border of the inner space for filling. On the outer areas 21 and 22, a separation seam 8 extends immediately along the border 15 of the inner filling space. These outer areas are exposed to critical stress when filling the bag. Also, the filled bag is under a significant load during transport and handling on these outer sides. Therefore, it is very important that there is a separation seam of increased strength at these longitudinal sections of the boundary of the inner filling space. This does not exclude the need to provide another sealed seam on the inside towards the separation seam, in order to close the border of the inner space for filling, especially when filling with smaller pieces of material. Separating seam, which extends closely along ie. at about 5 mm behind one such sealed seam along the boundary 15 of the internal filling space, is then able to protect the weaker sealed seam from cracking or to replace it after cracking due to the limitation of the internal filling space.

In this case, on both sides of the opening 13 of the handle, towards the outer areas 21 and 22 along the border 15 of the inner space for filling, one piece of sealed seam 23 and 24, respectively, was placed, in order to close the inner space for filling in these intermediate spaces.

In the region of the opening 13 of the handle, it can, in the event that it is formed by a separating seam, offer a suitable finish from the outside in the form of a border of the inner space for filling. It goes without saying that the space 13 for the handle, made by stamping, towards the inner space for filling could also be accompanied by a sealed seam, which passes from the inside, and which has less strength, but which is less loaded in the middle area.

In this way of realizing the bag, the separating seam 8 continues through the inner space 16 for filling towards the opening of the bag, all the way to the end edge 6. This certainly creates waste between the separating seam 8 and the end edge 9 of the previously produced (opened) bag, which is removed or vacuumed using standard devices. Otherwise, bag 1 should absolutely be produced in the usual way and also filled in the usual way on packaging machines. The decisive advantage consists in the increased strength of the separation seam 8 in the region of the boundary 15 of the inner filling space, the result of which is a bag, durable during filling and further transport and handling, even with an extremely reduced film strength.

Claims (6)

Patent claims 1. A bag (1) made of a thin plastic film, which can be sealed, and especially made of a film with a thickness of less than 40 μm, whereby a handle is attached to the inner space (16) for filling the bag, formed by two layers of plastic film (12) for grasping on at least one side, wherein the plastic film extends and joins along the border (15) of the inner filling space, extending in two layers, as an outer edge, up to the separation seam (8) made by thermal fusion and separation, and containing at least one opening (13) of the handle, creating an inner space (16) for filling between the border (15) of the inner filling space and the edge (7), which is parallel to with it on the other side, and which transversely from there has on one side also an opening for filling with a double-layer plastic film, characterized by the fact that the outer edge of the handle (12) for grasping, formed by a separating seam (8), represents the border (15) of the internal space for filling in those parts of the longitudinal sections (21, 22) that do not have an opening (13) of the handle. 2. A bag (1) according to claim 1, characterized in that the grip handle (12) has a handle opening (13) positioned approximately in the middle and extending on both sides of the opening (13) handles with a separation seam (8) that runs along the very border of the interior space for filling. 3. A bag (1) according to claim 1 or 2, characterized in that the opening (13) of the handle is made by a separating seam (8) that extends towards the inner filling space (16) along the border (15) of the inner filling space. 4. Bag (1) according to claim 3, characterized in that the opening (13) of the handle is made in the form of a tongue with a separating seam (14) in the form of an open ring. 5. A bag (1) according to one of the claims 1 to 4, characterized in that the fold as a handling edge from which it is filled is pierced with holes (20). 6. Bag (1) according to claim 5, characterized in that the fold is made of two layers of unequal length (edges 5, 6) of plastic film.