FI102264B - Method of attaching the inner bag of a large bag to the outer bag - Google Patents

Description

102264

Method for attaching a large inner bag to an outer bag Förfarande för att lasta den inre äcken av en storsäck vid den yttre säcken 5

The invention relates to a method for attaching an inner bag of a large bag to an outer bag, in which method the inner bag is attached to the outer bag using an adhesive and an adhesive having sufficient adhesion to support the inner weight of the inner bag but allows the adhesive seam between the inner bag and the outer bag to move.

Numerous different ways of attaching an inner bag of a large bag to an outer bag-15 are known in the art. One commonly used method is to attach the inner bag behind the side seams formed in the inner bag to the outer bag, e.g. by sewing. Correspondingly, the pleated inner bag is attached to the outer bag behind the seams at the ends of the plugs, e.g. by sewing. In some commonly used solutions, the inner bag is attached to the outer bag by means of separate attachments.

* ···: 20 h · ♦ ♦ «• · 4 FI patent No. 87 914 discloses a method for attaching an inner bag of a large bag to an outer bag, in which method the inner bag is attached to the outer bag using an adhesive“ V. The inner bag is glued to the outer bag above the closing point of the inner bag. even after filling in bulk bags. The gluing, most preferably hot-melt gluing (hot-melt gluing), is performed either on the outer surface of the outer bag or on the inner surface of the outer bag.

• ♦ · • · • · · • · · ·

F1 publication 88 145 discloses a method in which the upper part of the inner bag is shaped. at least one cut or weakening and the inner bag is attached to the cut or • · ·. 30 from the area at least partially delimited by the attenuation from at least one attachment point to the outer bag.

t 2 102264

ΕΡ-0 158 361 discloses a method for attaching a loose inner bag to an outer bag. In this known method, the adhesive is applied to the folds of the outer bag and the folds of the inner bag. The folds of the inner bag containing the adhesive are preferably midway with the corresponding folds of the outer bag. 5 When the inner bag is filled with bulk goods, the inner bag expands, i.e., the adhesive-containing portions of the inner bag are adhered to the outer bag and the adhesive-containing portions of the outer bag are adhered to the inner bag so that the inner bag retains its alignment with the outer bag.

10 Because the inner bag is usually made of a very thin flexible material, it can often wrinkle or braid when placed inside the outer bag. If the crumpled or braided inner bag is attached to the outer bag in this way, it cannot expand to its full volume and there is a risk of holes forming in the inner bag. The wall of the inner bag damaged in this way naturally cannot withstand the loads when the inner bag 15 is filled with bulk goods. Consequently, EP-0 158 361 uses the gluing method described above.

The purpose of attaching the inner bag is to prevent the inner bag from flowing down with the filling material when the large bag is emptied. If the inner bag were to drain down into the emptying opening, the consequence would be that the emptying opening would close and part of the bulk material would not be able to leave the inner bag. Another important purpose inside

• · I

• * · · The attachment is to prevent water from entering the bulk • • · · · *: *. the inner bag.

* «· 25 There are several significant disadvantages to currently known fastening methods.

♦ ·: T: Some fastening solutions known from the prior art are very difficult to implement in practice, because some fastening methods require very precise • · t · alignment of the outer bag and the inner bag. The use of separate fasteners, in turn, requires the use of additional \ material, which causes a separate work step.

30

In the method according to EP-0 158 361, the adhesive is applied to very narrow folds or folds so that the adhesive does not adhere too early to the 3 102264 counterpart when the folds open and so that the inner bag is correctly aligned with the outer bag so as not to create harmful stresses between the inner bag and the large bag. make a hole in the inner bag. Such application of the adhesive is technically very difficult to carry out. In the case of a large bag, the adhesive can be applied to the edge area of the fabric if 5 large bags are made of separate pieces by means of joint seams. However, such a solution is a cumbersome, expensive investment and causes a lot of driving waste, which makes the production of a large bag relatively expensive.

It is an object of the invention to provide an improvement over currently known solutions for attaching an inner bag 10 to an outer bag. It is a detailed object of the invention to provide a method for attaching an inner bag to a large bag, which method is very easy to perform and is also reliable and does not cause damage to the inner bag.

The method according to the invention is characterized in that the adhesive is applied only to the outer surface of the inner bag.

The method according to the invention achieves a number of significant advantages over the technology. compared to known methods. Thanks to the method according to the invention

* · I

the pairwise * I «, ',' used in the method described in EP-0 158 361 is avoided. 20 Disadvantages caused by adhesive zone alignment. In the method according to the invention, when the adhesive areas are located in the outer bag, these adhesive areas do not interfere with the insertion of the inner bag inside the outer bag. The method according to the invention even allows the inner bag and the outer bag to be weakly adhered to each other before the filling of the inner bag begins, i.e. before the expansion of the inner bag begins. The main thing in the method according to the invention is that the inner bag does not detach from its own weight from the outer bag. Thanks to the method according to the invention, the adhesive seam or seams between the inner bag and the outer bag can slide even relatively much when filling the big bag without causing • · · «. * * *. any problems.

The big bag provided by the method according to the invention, i.e. the inner bag / outer bag combination, can be delivered to the users so that the adhesive is ready in place in connection with 4 102264 big bag deliveries. In this case, the user of the big bag does not have to do any additional work in connection with the filling of the big bag, such as, for example, attaching the inner bag to the outer bag with a tape. Secondly, when emptying the big bag, the user also does not have to take any additional measures to keep the inner bag in place during the emptying of the big bag 5.

The invention will be explained in detail with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

10

Figure 1 shows a schematic cross-section of a method of gluing a large bag and an inner bag known from the prior art.

Figure 2 shows a schematic cross-section of a preferred embodiment of an outer bag used in the method according to the invention.

Figure 3 shows another outer bag used in the method according to the invention. preferred embodiment in schematic cross section.

·

• I

. . ·. Figure 4 shows an advantageous inner bag used in the method according to the invention:. *. embodiment in a schematic cross-section.

<I «I

• · · «· · ·

Figure 5 shows a schematic cross-section of another preferred embodiment of an inner bag used in the method according to the invention.

Figure 6 shows a schematic cross-section of a third preferred embodiment of an inner bag used in the method according to the invention.

«» ·· • · · • «• · • ·

Figure 7 shows a fourth of the inner bag used in the method according to the invention. 30 preferred embodiments in schematic cross-section.

• ♦ 5 102264

Figure 8 shows a schematic cross-section of a fifth preferred embodiment of an inner bag used in the method according to the invention.

Figure 9 shows a schematic cross-section of a 5th sixth preferred embodiment of an inner bag used in the method according to the invention.

Figure 10 shows a schematic cross-section of a seventh preferred embodiment of an inner bag used in the method according to the invention.

Figure 1 shows a large sack known from EP-0 158 361, generally indicated by reference numeral 10. The large sack 10 consists of an outer sack 11 and a detachable inner sack 12. The outer sack 11 has pleats 13 and the inner sack 12 has pleats 14.

Adhesive adhesive 15 is disposed in the pleats 13 and 14. The pleated portions 14 of the inner bag 12 containing the adhesive 15 are substantially midway 15 to the pleated portions 13 of the outer bag 11 containing the adhesive 15. When the inner bag 12 is filled with bulk material, the inner bag 12 expands and the inner bag 12 adheres to the outer bag 11. The folding adhesive according to Fig. 1 has the numerous disadvantages described above.

In the embodiment according to Figure 2, the big bag is generally indicated by the reference number I «t:. 20. In this embodiment, only the pleated portions 24 of the outer bag 21 are placed with the adhesive 23 as shown in the figure. When an inner bag 22 is placed inside such an outer bag 21, it is found that the adhesive areas 23 do not interfere with the placement of the inner bag 22 inside the outer bag 21. In the method according to the invention, the adhesive is applied to the inner surface of the outer bag 21, but not to the cramped space formed by the fold, i.e. the latch 24, but vice versa to the outer surface of the pleated point 24. When the big bag 20 according to Fig. 2 is filled, the inner bag 22 can expand completely freely and meet the adhesive areas 23 of the outer bag 21 only when the inner bag 22 and the outer bag 21 have almost reached their final shape.

*; i 30 6 102264

In the embodiment according to Fig. 3, adhesive areas 33 are arranged on the inner surface of the outer bag 31 of the big bag 30, which are located substantially opposite and relatively far from the pleated points 34 of the outer bag 31. An inner bag can be fitted inside such an outer bag 31, for example either by reference numeral 32a or by reference number 32b 5. This embodiment is inferior to the embodiment shown in Fig. 2 because the inner bag 32a or 32b meets the adhesive areas 33 very soon after the inner bag is started to be filled. In fact, the inner bag 32a or 32b may even be weakly adhered to the outer bag 31 before filling the inner bag, but this is not a disadvantage because an adhesive is used whose adhesion allows the adhesive seam or seams between the inner bag 32a or 32b and the outer bag 31 to move into the inner bag. when filled in bulk.

In the embodiment of Figure 4, the inner bag 42 of the large bag is bent into a kind of "waveform", and the adhesive is applied at points 43. The adhesive areas 43 are located on the outer surface of the inner bag 42. The adhesive regions 43 are located at a substantial distance from the ridge (s) 44 of the inner bag 42 and the bottom of the wave 45 in the region between the wave crest 44 and the bottom 45 of the wave. When such an inner bag 42 is placed inside an outer bag (not shown),. the solution according to Fig. 4 works in a substantially similar way to the solution according to Fig. 2

«« I

4 · r Γ! solution in accordance with.

20; , ·. The embodiment shown in Fig. 5 is otherwise the same as the embodiment shown in Fig. 4, but in the embodiment according to Fig. 5 the adhesive areas 53 are located at the edges of the folded inner bag 52 as far as possible from the crest 54 and the bottom 55 of the crest.

When such an inner bag 52 is placed inside an outer bag (not shown), the areas of adhesive: Y: 25 adhere almost immediately to the outer bag in substantially the same manner as in the embodiment of Figure 3. This solution is not detrimental either, since the adhesive «can be selected in a manner similar to the embodiment according to Fig. 3.

In the embodiment of Figure 6, the inner bag 62 is folded into a nearly closed ring 30, and adhesive areas 63 are disposed on the inner surface of the inner bag 62 at edges that form an open point 64 in the form of a bent ring of the inner bag 62. When such an inner bag 62 is placed inside an outer bag (not shown), the solution works substantially as well as the embodiments of Figures 2 and 4.

The inner bag 72 shown in Fig. 7 is a pleated inner bag, and the adhesive areas 73 are located on the outer surface of the pleated inner bag 72 at the point where the pleat 74 begins to extend inward. When such an inner bag 72 is placed inside a large bag (not shown), the solution of Figure 7 works substantially as well as the solutions of Figures 2, 4 and 6.

The inner bag 82 shown in Figure 8 is bent into a substantially open U-shape. The adhesive-10 region 83 is located in the immediate vicinity of the tip 84 of the second U-shaped mandrel. The solution shown in this embodiment also works substantially as well as the solutions shown in Figures 2, 4, 6 and 7.

In the embodiment of Figure 9, the inner bag 92 is bent into the shape of a substantially oval ring, and the adhesive region 93 is located in close proximity to the second overlapping end 94 of the bent inner bag 92.

. In the embodiment shown in Figure 10, the inner bag 102 is bent at substantially the same time

• I I

i ': in the same way as in the embodiment of Fig. 9, but the adhesive area 103 is located substantially opposite the point where the ends 104 of the bent inner bag 102 overlap with respect to each other.

'5 »*» 1 Φ • • · · · · ·

The solutions shown in Figures 9 and 10 also work substantially as well as the solutions shown in Figures 2.4 and 6-8.

In the method according to the invention, the adhesive used is preferably an adhesive whose adhesion is sufficient to support the own weight of the inner bag, but allows the adhesive seam between the inner bag and the outer bag to move when filling the bulk bag t. Thus, a low cohesion adhesive can be used as the adhesive,

I <I

30 such as preferably a self-adhesive. An adhesive that can be activated by external conditions, for example, can be used as a swimming agent. One such adhesive is ultraviolet radiation activated adhesive. A catalyst can be added to such an adhesive which, under the action of ultraviolet radiation, causes the adhesive to adhere. An adhesive which is activated by the action of air humidity, rainwater or the like can also be used as the adhesive. An inorganic or organic hygroscopic substance may be added to such an adhesive. For example, an ethyl vinyl alcohol based hygroscopic agent is very suitable and useful for the purpose of the invention.

Only some preferred embodiments of the invention have been described above, and it will be apparent to those skilled in the art that numerous modifications may be made thereto within the scope of the inventive idea set forth in the appended claims.

* · · · • · • ·· · • · · · · ♦ • · · · · · · · · · · · · · · · · · · · · ♦ • · · ♦ • · 1 · ♦ • · ·

Claims (17)

A method of attaching an inner bag (22,32a; 32b, 42,52, 62,72,82,92,102) of a large bag (20.30) to an outer bag (21,31), wherein the inner bag is attached to the outer bag by the use of glue, and as a glue is used a sizing glue whose fastness is sufficient to support the intrinsic weight of the inner bag, but allows movement of the glue joint between the inner bag and the outer bag of the large bag (20). , 30) is filled with bulk material, characterized in that the adhesive (43,53,63, 73,83,93,103) is spread only on the outer surface of the inner bag (42,52,62,72,82, 92,102). . 2. A method according to claim 1, characterized in that glue blank (43) is applied to the outer surfaces of the substantially road-shaped inner bag (42) in the form of glue areas located substantially distant from the top (44) of the road and from The valley (45) of the path of the inner bag (42). Method according to Claim 1, characterized in that glue blank (53) is applied to the outer surfaces of the substantially road-shaped inner bag (52) in the shape of adhesive areas (53) located substantially at the edges. of the road-shaped II t, 20 inner bag (52). 4. A method according to claim 1, characterized in that adhesive (63) is applied to the outer surfaces of the inner bag (52) which is bent in the form of an almost closed ring, in the form of adhesive areas which are located. substantially at the edges of the inner: Y: sack (62) opposite each other at the open position (64) of the inner sack (64) with: T: the shape of an almost closed ring. · · · · · · · 5. A method according to claim 1, characterized in that glue blank (73) is obtained; is applied to the outer surface of the pleated inner bag (72) in the form of adhesive areas on the · · · ···. 30 places where the fold (74) begins to align in the net. «·« · · 102264 6. A method according to claim 1, characterized in that glue blank (83) is applied to the outer surface of the substantially open U-shaped inner bag (82) in the immediate vicinity of at least one of the tips (84). 5 7. A method according to claim 1, characterized in that the inner bag (92) is substantially bent in the form of an oval ring in such a way that the ends of the inner bag (92) overlap, and that glue blank (93) is applied to it. the outer surface of the inner bag (92) in the immediate vicinity of the at least one overlapping end (94). 10 8. A method according to claim 1, characterized in that the inner bag (102) is substantially bent in the form of an oval ring in such a way that the ends (104) of the inner bag (102) overlap and that glue blank (103) is applied to the outer surface of the inner bag (102) at a location substantially opposite to the place where the ends (104) of the curved inner bag (102) overlap. 15 A method of attaching an inner bag (22.32a; 32b, 42.52, 62.72.82.92.102) of a large bag (20.30) to an outer bag (21.31), the inner bag is attached. the outer bag using glue, and as a glue a saddle is used, v, glue whose adhesive strength is sufficient to support the intrinsic weight of the inner bag, but allows movement of the glue joint between the inner bag and the outer sack where the large sack (20,30) is filled with bulk goods, characterized in that glue substance (23,33) is spread only on the folded inner surface of the outer sack (21,31). · · · · · · · · · · · · Method according to claim 9, characterized in that glue blank (23): V: 25 is applied to the inner surface of the folded outer bag (21) to the outer surface of the 7 · folded stand (24). • · · • Ml 11. A method according to claim 9, characterized in that adhesive (33) is applied to the inner surface of the folded outer bag (21) in the form of adhesive areas which. · · ·. 30 are located substantially opposite each other and substantially long from the folded sites (34) of the outer bag (31). 102264 Method according to any of claims 1-11, characterized in that a glue with low cohesion is advantageously used, preferably a decal adhesive. Method according to any of claims 1-11, characterized in that as an adhesive substance is used an adhesive which is activated by external circumstances. 14. A method according to claim 13, characterized in that, as an adhesive, an adhesive is activated by ultraviolet radiation. 10 15. A process according to claim 14, characterized in that a catalytic agent is added to the adhesive which, through the action of ultraviolet radiation, provides adhesion of the adhesive. 16. A method according to claim 13, characterized in that as an adhesive 15 is used an adhesive which is activated by the influence of humidity, rain water or the like. 17. A process according to claim 16, characterized in that an inorganic or organic hygroscopic substance is added to the adhesive. 20 ··· »· t · ··· · · · · · · t · · · · · · · · · · · M ·« ·· «MI · I« II » • • «• •« «