NL8800414A - Plastics foil sack manufacturing method - uses raised pattern strips, providing increased friction between sacks - Google Patents

Abstract

Sacks (1, 2) for transporting e.g. powder products have a centre pattern (3) of protrusions, e.g. knobs The raised pattern is applied e.g. using a (hot melt) process. Pallet stacking e.g. of sacks containing powder is improved by applying a raised pattern on the sack surface, which improves friction between the sack surface, thus enabling economic stacking of sacks on a pallet.

Description

V I

875153 IU / ki

Short designation: Bag made of plastic film and I.

providing means for raising I

of the roughness of the outside of the J

pocket wall. I

The present invention relates to a bag

made of plastic film. I

Such bags are generally known and are used

suitable for packing different kinds of products I

5 at. The bags generally have a smooth outer surface

flat. This has the drawback that when stacking the I

bags on a pallet, for example, the bags tend to I.

have to slide relative to each other, so that I

the stack is unstable. This is particularly the case for I.

10 when the bags are filled with a powdered material I.

and residues of this material on the outside of the bag I.

stick. Shifting gestures relative to each other

peeled bags could be prevented by pressing the walls I.

of the bags that come together when stacked I

15 are to apply adhesives. However, this has the I

drawback that damage is caused when taking bags from the stack

of the bags occurs. 1

The present invention contemplates a plastic film I

to provide a manufactured bag which in stacked condition I

20 does not shift with respect to neighboring pockets. I

This object is achieved according to the invention in that I

the front and back walls of the bag are both at least partial

are provided with means that the roughness of at least 1

raise the outside of the pocket wall. I

25 This ensures that despite the possible presence I

filling material between the stacked bags the I

friction between the bags is still sufficient to shift I.

of the bags relative to each other, without I

that adhesives are necessary to shift the bags I.

30 relative to each other. I

Preferably, the roughness enhancing agents are arranged in a pattern adapted to the shape of the bag. By choosing a particular pattern it can be achieved that of all bags in a stack, the areas with roughness enhancers come into contact with such areas of bags above and below, while still having a minimum surface area of the wall of the bag needs to be provided with roughness enhancing agents.

Practical embodiments of a bag according to the invention, in which the bag has a substantially rectangular shape, are defined in claims 3 to 9 and described in the figure description below.

The roughness enhancing means preferably consist of a matrix of relatively small elevations arranged on the outside of the bag wall, the dimensions and the mutual distance of which are such that when bag walls provided with these elevations come to lie on top of each other, the elevations on the wall of a bag will lie between the elevations on the wall of a bag lying on or under this bag.

The elevations can be formed by dots of a fusible plastic composition (hot melt) applied to the bag wall or by protrusions of the bag wall.

The invention will now be further elucidated with reference to the description of a number of embodiments of a bag according to the invention with reference to the accompanying drawing, in which figure 1 schematically shows two related stacked bags according to the invention, each bag being providing roughness enhancers applied in a certain pattern, figures 2a, 2b, 2c schematically show in top view, front view and side view a number of layers on a pallet with standard dimensions in relation to stacked bags, 30 - figures 3, 4 and 5 a number show possible patterns in which roughness enhancers can be applied to a bag according to the invention suitable for stacking in the manner indicated in fig. 2, fig. 6 the overlapping areas of the co-acting roughness enhancers of two on top of each other. 8800414

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horizontal layers of bags indicates when bags according to I

Figure 5 are stacked in a bandage according to Figure 2,]

- figures 7a, 7b and 7c schematically in top view, I.

front view and side view of a number of layers on a pallet I.

5 bags stacked with standard dimensions represent analog I.

to Figures 2a, 2b and 2c, but with different dimensions of I.

the bags and another stack, I

Figures 8, 9 and 10 show a number of possible patterns

indicate in which roughness enhancers can be indicated I

10 is applied to a bag according to the invention which is suitable for I

be stacked in the manner shown in Figure 7, and I.

- Figure 11 shows the overlapping areas of the I.

cooperating roughness enhancers indicates when I

bags according to figure 8 in a bandage according to figure 7 I.

15 are stacked. I

In figure 1 schematically two are made of plastic film I.

filled bags 1 and 2 manufactured according to the invention I

which are related to each other in a certain context I

stacked. To avoid the bags in stacked I

20 shift relative to each other, as a result I.

of the fact that the plastic material from which the bags I

have a smooth surface and / or that between I.

the bags remain of the material with which the bags are I

filled, is present, the front and rear walls are 1a, 1b, 1

25 resp. 2a, 2b of the bags provided in a certain I.

cartridge applied means that the roughness of at least I.

raise the outside of the pocket wall. In Figure 1, the I

areas in which the roughness enhancers are applied, indicated by 3.

30 The pattern in which the roughness enhancers are

depending on the shape of the bag as well as the way in which the bags are stacked. In Figure 2a, 2b, I

2c, is schematic in resp. top view, front view and I.

side view showing how bags with filled I

For example, a length of approximately 60 cm and a width of approximately 40 cm can be stacked on a pallet 4 with standard dimensions of 100 x 120 cm. The layer 5 directly on the pallet .8800414 * - 4 - consists of a row of three bags with the long sides lying against each other and two bags lying against the front side of these three bags that are rotated through an angle of 90 ° at compared to the three bags mentioned earlier. In this way, the entire surface of the pallet is covered. In the second layer 6, the bags are in the same pattern, but rotated 180 ° relative to the first layer. The pattern of the third layer 7 and the fourth layer 8 corresponds to that of the first 10 layer 5, respectively. the second layer 6. This manner of stacking is generally referred to as 2-3 stacking.

Figures 3, 4 and 5 show three possible patterns for applying the roughness enhancing agents, which match the stacking shown in Figure 2. The pattern shown in figure 3 consists of two elongated strips 9 and 10 which run substantially parallel to the two long rectangular sides 11 and 12 of the bag 1.

The pattern shown in Figure 4 consists of two elongated strips 13 and 14 running parallel to the two long rectangular sides 11 and 12 of the bag 1 and two elongated strips 17 and 18 running parallel to the short rectangular sides 15 and 16 of the bag 1.

In the pattern shown in Figure 5, the strips 19 and 20 running parallel to the long rectangle sides 11 and 12 and the two strips 21 and 22 running parallel to the short rectangle sides 15 and 16 are joined together so that they together form a closed rectangle. to shape.

In the patterns shown in Figures 3, 4 and 5, the longitudinal centerline of each strip 9 to 22 is spaced at a distance of 30 from the adjacent rectangular side of the bag parallel to the respective centerline, which is 1/4 or approximately 1 / 4 the width of the filled bag. In the patterns shown, the width of each strip is substantially equal to 1/4 of the width of the filled bag. By applying the roughness-increasing agents to the bags in such patterns, it is ensured that when the bags according to Fig. 2 are stacked, areas with roughness-increasing agents are always added.

w I

means on bags of a particular layer in the stack in I.

being in contact with areas with roughness enhancers I.

of bags with a layer below or above this layer I.

of the stack, while still having a minimal surface area of the I.

5 front and back wall of the bags are provided with roughness I.

enhancers- I

In Figure 6, the shaded areas are the overlap

areas of the co-operating roughness resistance I

raising means when two layers of bags provide I.

10 of roughness enhancers in FIG. 5I

shown, in the manner indicated in I in Figure 2

are stacked together. Thanks to this configuration, I

a solid stack, the stacked bags I.

remain in place during transport, i.e. mutually I

15 do not shift. I

Figure 7 shows how smaller I

bags with, for example, a length of I when filled

about 40 cm and a width of about 30 cm on a pallet 4 I.

with standard dimensions of 100 x 120 cm can be I.

20 stacked. Figures 7a, 7b and 7c show in I, respectively

top view, front view and side view one on one I.

pallet 4 placed stack of four layers bags again. The I

bottom layer 23 consists of two adjacent I

rows of three bags each with the short sides against I.

25 are placed together and an adjacent row of I.

four side-to-side pockets

emptying. In this way, the pallet surface is exactly defined by I.

one layer of bags covered. In the second layer 24, the bags are I.

laid out in the same pattern, only turned 180 at I.

30 relative to the first layer 23. The third 21 and fourth layer I.

26 again correspond to the first 23 and I, respectively

second layer 24. It is also the case with bags of this size

possibly compose a layer from a row of I.

four pockets with their long sides together I

35 and two rows of three bags each with the short side I.

against each other and which are placed on either side of the first row of four bags mentioned above. The bee one

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.8800414 «- 6 -

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Patterns of the roughness enhancers associated with such stacking are shown in Figures 8, 9 and 10. These patterns essentially correspond to the patterns shown in Figures 3, 4 and 5, with the difference that the center lines of the strips that make up these patterns are at a distance from the rectangular side of the bag running parallel to the respective strip which is equal to 1/6 or about 1/6 of the width of the filled bag. The width of each strip is substantially equal to 10 1/6 of the width of the filled bag.

In Figure 11, the shaded areas are the overlapping areas of the co-operating roughness enhancers when two layers of bags provided with roughness enhancers in the pattern shown in Figure 8 are stacked together in the manner shown in Figure 7 . In this configuration, too, a sturdy stack is obtained, whereby the stacked bags do not shift mutually.

The roughness enhancing means may consist of a matrix of relatively small elevations applied to the outside of the bag wall. The dimensions and the mutual bra preference of these elevations are such that when bags provided with these elevations are stacked, with elevated pocket walls coming to rest on each other, the elevations on the wall of a bag between the elevations lie on the wall of a bag lying on or under this bag. Preferably, the space between an intervening elevation and the enclosing elevation is smaller than the size of the elevation itself.

The elevations can be formed by dots of a fusible plastic composition, a so-called "hot melt", applied to the bag wall, which adheres to the wall of the bag made of plastic foil under heating. Preferably, the fusible plastic composition 35 is compatible with the material of the bag. However, the elevations can also be formed by bulges of the bag wall.

.8800414

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By bags made of plastic film on the I

In the manner described above, it is thus achieved that when such bags are stacked, a sturdy stack I.

is obtained, the bags cannot mutually I

5 while not sticking together, so that when I

removing the bag from the stack, no damage by I.

adhesion can occur. I

.8800414

Claims (13)

Bag made of plastic film, characterized in that the front and rear walls (1a, 1b or 2a, 2b) of the bag (1, 2) are both provided at least partly with means that the roughness of at least the outside of increase the 5 pocket wall. Bag according to claim 1, characterized in that the roughness enhancing means are arranged in a pattern adapted to the shape of the bag. Bag as claimed in claim 2, wherein the bag has a substantially rectangular shape, characterized in that the pattern consists of at least two elongated first strips (9, 10; 13, 14; 19, 20) which essentially run parallel to both long rectangular sides (11, 12) of the bag (1). Bag according to claim 3, characterized in that the pattern also consists of two second strips (17, 18; 21, 22) which run substantially parallel to the short rectangular sides (15, 16) of the bag (1). Bag according to claims 3 and 4, characterized in that the first (19, 20) and second strips (21, 22) are connected to each other such that they together form a closed rectangle. 6. Bag according to any one of claims 3-5, characterized in that at a ratio between the length and the width of the filled bag of 3: 2 or approximately 3: 2 the longitudinal centerline of each strip at a distance from the neighboring, is parallel to the center line of the rectangle, which is equal to 1/4 or approximately 1/4 of the width of the filled bag. Bag according to claim 6, characterized in that the width of each strip is substantially equal to 1/4 of the width of the filled bag. Bag according to any one of claims 3-5, characterized in that at a ratio between the length and the width of the filled bag of 4: 3 or approximately 4: 3 the longitudinal centerline of each 35 strip at a distance from the neighboring , parallel to the 88 0 04 f 4 - 9 - £. I concerning centerline running rectangle side which is equal to 1/6 or about 1/6 of the width of the filled bag. I Bag according to claim 8, characterized in that the width I 5 of each strip is substantially equal to 1/6 of the width I of the filled bag. I 10. Bag according to any one of claims 1-9, characterized in that the roughness-increasing means consist of a matrix I of relatively small elevations arranged on the outside of the bag wall, the dimensions and the mutual distance of which are such that when bag walls provided with these elevations come to rest on each other, the elevations on the wall of a bag come to lie between the elevations on the wall of a bag lying on or under this bag. I Bag according to claim 10, characterized in that the ref holes are formed by dots of a meltable plastic composition (hot melt) applied to the bag wall. I Bag according to claim 11, characterized in that the meltable plastic composition is compatible with the bag material. I Bag according to claim 10, characterized in that the elevations are formed by protrusions of the bag wall. I .8800414