Bag and film tube for producing such a bag

Abstract

The invention relates to a bag (3) having a filling space for bulk material, which filling space is delimited by a lower base (4), a circumferential wall (6), and an upper filling space closure (8) facing away from the lower base (4). The bag has at least one tear-open strip (10) for exposing an opening area (12) of the bag (2), which is delimited by an upper weakening line (14) and a lower weakening line (16), wherein both weakening lines (14, 16) extent parallel to the upper filling space closure (8), and the upper weakening line (14) is positioned between the upper filling space closure (8) and the lower weakening line (16). The bag (2) has a longitudinal seam (18) extending transversely with respect to the upper filling space closure (8). The upper and the lower weakening line (14, 16) begin in the area of the longitudinal seam (18). The longitudinal seam (18) is formed so as to be weaker in the area between the two weakening lines (14, 16) than above the upper weakening line (14) and below the lower weakening line (16).

Claims

1. A bag comprising: a lower bottom, a circumferential wall, and an upper filling space closure facing away from the lower bottom, wherein the lower bottom, the circumferential wall, and the upper filling space closure define a filling space of the bag for bulk material; a longitudinal seam extending transversely to the upper filling space closure; at least one tear-open strip for opening an opening field of the bag, wherein the at least one tear-open strip is delimited by an upper weakening line and a lower weakening line, wherein the upper and the lower weakening lines extend parallel to the upper filling space closure, and wherein the upper weakening line is positioned between the upper filling space closure and the lower weakening line; wherein the upper and the lower weakening lines begin in a region of the longitudinal seam; wherein the longitudinal seam is weaker in a region of the longitudinal seam between the upper and the lower weakening lines than in a region above the upper weakening line and in a region below the lower weakening line; wherein the bag is a side gusset bag and the circumferential wall comprises a front side and a rear side connected to each other by a first sidewall and a second sidewall, wherein the first and second sidewalls are formed by side gussets, respectively, and wherein the upper and the lower weakening lines extend transversely across at least 80% of a width of the front side or a width of the rear side and do not extend into the side gussets; wherein a distance of the upper weakening line in relation to a material chamfer of the bag amounts to 30 to 65 mm, wherein a distance of the lower weakening line in relation to the upper weakening line amounts to 15 to 25 mm, and wherein the upper and the lower weakening lines are arranged centered either at the front side or at the rear side and extend across 15% to 35% of a circumference of the bag.

2. The bag according to claim 1, further comprising a disrupting compound impairing a welding process in the region of the longitudinal seam between the upper and the lower weakening lines.

3. The bag according to claim 1, further comprising a tab arranged at a start of the tear-open strip between the upper and the lower weakening lines, wherein the tab projects opposite to a tear open direction past the longitudinal seam and does not adhere to a material of the circumferential wall of the bag.

4. The bag according to claim 1, wherein a material and a width of the at least one tear-open strip and a bag material of the bag in a region of ends of the upper and the lower weakening lines are configured such that a resistance against tearing open the at least one tear-open strip past the ends of the upper and lower weakening lines in a tear open direction is greater than a resistance against tearing off the at least one tear-open strip from the bag.

5. The bag according to claim 1, wherein the bag is comprised of a film.

6. The bag according to claim 1, wherein the upper and the lower weakening lines extend across the entire width of the front side or the entire width of the rear side.

7. The bag according to claim 1, wherein the upper filling space closure comprises a fingertip contact region at an inner side thereof facing the filling space, wherein the fingertip contact region is formed by the material chamfer between a first leg and a second leg of the bag, wherein the first leg extends from the upper weakening line to the material chamfer, wherein the second leg adjoins the first leg beginning at the material chamfer, and wherein the first and the second legs, in a state of the bag filled with the filling material and with the opening field open, are positioned at an angle of not more than 135 degrees when carrying the bag by reaching into the opening field.

8. The bag according to claim 7, wherein the upper filling space closure is a transverse seam and the transverse seam forms the material chamfer in an interior of the bag.

9. The bag according to claim 7, wherein the upper filling space closure is formed by an upper bottom and wherein the material chamfer forms a transition of the circumferential wall to the upper bottom.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further details and advantageous embodiments of the invention will be explained in the following with the aid of a schematically illustrated bag and a schematically illustrated detail of a film hose according to the invention; it is shown in:

(2) FIG. 1 a bag according to the invention with closed opening field;

(3) FIG. 2 a bag according to the invention corresponding to FIG. 1 with tear-open strip torn open along the weakening lines;

(4) FIG. 3 an object of FIG. 2 in pouring position, showing the grip and the V-shaped spout; and

(5) FIG. 4 a detail of the laid-flat film hose.

DESCRIPTION OF PREFERRED EMBODIMENTS

(6) In the following, elements of the invention acting in the same way are provided with a uniform reference number, provided this is expedient. In particular, elements of the bag according to the invention which can be found also in the film hose according to the invention are provided with a uniform reference number. The features of the invention explained in the following with the aid of the embodiments can be subject matter of the invention also individually or in other combinations than illustrated in the embodiment.

(7) FIGS. 1 to 3 show a bag 2 according to the invention with a filling space for bulk material that is delimited by a lower bottom 4, a circumferential wall 6, and an upper filling space closure 8 facing away from the lower bottom 4. The bag 2 comprises a tear-open strip 10 for opening an opening field 12 of the bag 2 that is delimited by an upper weakening line 14 and a lower weakening line 16. Both weakening lines 14, 16 extend in this context parallel to the upper filling space closure 8 and the upper weakening line 14 is positioned between the upper filling space closure 8 and the lower weakening line 16. The bag 2 comprises a longitudinal seam 18 extending transversely to the upper filling space closure 8. The upper and the lower weakening lines 14, 16 begin respectively in the region of the longitudinal seam 18. In the region between the two weakening lines 14, 16, the longitudinal seam 18 is embodied weaker than above the upper weakening line 14 and below the lower weakening line 16.

(8) At the start 20 of the tear-open strip 10 between the two weakening lines 14, 16, a tab 22 is arranged that projects past the longitudinal seam 18 opposite to the tearing open direction, wherein the tearing open direction is illustrated in the embodiment by the arrow 24 and does not adhere to the material 26 of the wall 6 of the bag 2 in this region.

(9) The bag material in the region of the ends 28 of the weakening line 14, 16 and the material and the width of the tear-open strip 10 are configured such that the resistance against tearing open the tear-open strip 10 past the ends 28 of the weakening lines 14, 16 is greater than the resistance against tearing off the tear-open strip 10 from the bag 2.

(10) In the illustrated embodiment, the bag 2 is a side gusset bag with a front side 30 and an oppositely positioned rear side which cannot be seen in the embodiment. Front side 30 and rear side are connected to each other by a first side wall 32 and a second side wall whose position is indicated by arrow 34. The sidewalls 32, 34 are formed by side gussets 36, respectively, and the weakening lines 14, 16 extend transversely across at least 80% of the width a of the front side 30. The region of the side gussets 36 is free of weakening lines 14, 16 in this context.

(11) The upper filling space closure 8 comprises a fingertip contact region 38 at its inner side facing the filling space which is formed by a material chamfer 40 between a first leg 42 and a second leg of the bag 2, which cannot be seen in the Figures whose position is however indicated by the arrow 44. The first leg 42 extends in this context from the upper weakening line 16 to the material chamfer 40 and the second leg 44 adjoins it beginning at the material chamfer 40. In the state of the bag 2 filled with filling material with opened opening field 12, the two legs 42, 44 are positioned at an angle of not more than 135° when carrying the bag 2 by reaching into the opening field 12. This holding position is illustrated in approximation in FIG. 3 wherein the bag 2 in FIG. 3 is held additionally by a second hand below the bag 2.

(12) The distance b of the upper weakening line 14 in relation to the material chamfer 40 amounts to 30 to 65 mm and particularly preferred 45 to 55 mm. The distance c of the lower weakening line 16 in relation to the upper weakening line 14 amounts to 15 to 25 mm. The circumferential wall 6 of the bag comprises here also a front side 30 and a rear side that cannot be seen in the embodiment wherein both weakening lines 14, 16 are arranged centered at the front side of the bag 2 and extend across 15 to 35% of the bag circumference.

(13) The upper filling space closure 8 in the embodiment is formed by a transverse seam 46 and the transverse seam 46 forms in the interior of the bag 2 also the material chamfer 40.

(14) FIG. 4 shows a detail of a film hose 48 according to the invention for producing the aforementioned bags 2 according to the invention. The film hose 48 comprises a plurality of tear-open strips 10 arranged at identical distances parallel to each other for opening a respective opening field 12 which are delimited respectively by an upper weakening line 14 and a lower weakening line 16. The film hose 48 comprises in addition a longitudinal seam 18 extending lengthwise in relation to the film hose 48. The upper and the lower weakening lines 14, 16 begin respectively in the region of the longitudinal seam 18, and the longitudinal seam 18 in the region between the upper and lower weakening lines 14, 16 correlated with a tear-of strip 10 is embodied weaker than above the upper weakening line 14 and below the lower weakening line 16.

(15) In the film hose 48 according to the invention, at the start 20 of each tear-open strip 10 between the two weakening lines 14, 16 correlated with this tear-open strip 10, a tab 22 is arranged which projects opposite to the tearing open direction 24 past the longitudinal seam 18 and does not adhere to the material 26 of the wall 6 of the bag 2. The film hose 48 comprises in addition a plurality of material chamfer regions 52 for introducing a material chamfer 40, respectively, which are arranged at identical distances transverse to the longitudinal extension, illustrated by the arrow 50, of the film hose 48. The distance b of the upper weakening line 14 of the correlated tear-open strip 10 in relation to the material chamfer region 52 amounts to 30 to 65 mm and in particular 45 to 55 mm. The distance c of the lower weakening line 16 to the upper weakening line 14 of each tear-open strip amounts to 15 to 25 mm. The weakening lines 14, 16 are arranged centered on the film hose 48 in its laid-flat state, illustrated in FIG. 4, and extend across 15 to 35% of the film hose circumference.

(16) The film of the film hose 48 in the region of the ends 28 of the weakening lines 14, 16 and the film and the width of the tear-open strip 10 are configured such that the resistance against tearing open the tear-open strip 10 past the ends 28 of the weakening lines 14, 16 is greater than the resistance against tearing off the tear-open strip 10 from the film hose 48.

(17) Reference Numbers 2 bag 4 lower bottom 6 wall 8 upper filling space closure 10 tear-open strip 12 opening field 14 upper weakening line 16 lower weakening line 18 longitudinal seam 20 start of the tear-open strip 22 tab 24 tearing open direction 26 material of the wall 28 end of the weakening lines 30 front side 32 first sidewall 34 second sidewall 36 side gussets a width of the front side 38 fingertip contact region 40 material chamfer 42 first leg 44 second leg b distance upper weakening line—material chamfer c distance upper weakening line—lower weakening line 46 transverse seam 48 film hose 50 longitudinal extension 52 material chamfer region