CN1113023C

CN1113023C - Stand-up bag for flowable or pourable products

Info

Publication number: CN1113023C
Application number: CN00805815A
Authority: CN
Inventors: W·舒尔茨
Original assignee: Amcor Flexibles Europe AS
Current assignee: Amcor Flexibles ApS
Priority date: 1999-03-29
Filing date: 2000-03-29
Publication date: 2003-07-02
Anticipated expiration: 2020-03-29
Also published as: PT1181205E; HUP0200397A2; DE60003026D1; NO20014621L; JP2002540024A; NO20014621D0; EP1181205A1; NZ514430A; ATE241519T1; RU2244668C2; ES2194712T3; TR200102757T2; AU3420000A; EP1181205B1; PL351139A1; WO2000058166A1; CZ20013409A3; HUP0200397A3; CZ294924B6; AU765690B2

Abstract

A stand-up bag of heat-sealable plastic film comprising two opposing side walls (1, 2) sealed together along lateral edges thereof by means of side seams (5, 6), an inwardly folded bottom wall (4) extending between the lower portions of the side walls (1, 2) and sealed to the respective side walls (1, 2) along transverse bottom seams (7) and along bottom side seams, and an inwardly folded top wall (3) extending between the upper portions of the side walls (1, 2) and connected to the respective side walls along transverse top connections (11, 12) and sealed to the respective side walls (1, 2) along top side seams. At least one of the transverse connections between the top wall (3) and the side walls is a peelable connection (12) provided between an upper edge portion (16) of the top wall (3) and an upper edge portion (15) of the adjacent side wall (2).

Description

The butt-ended bag that is used for flowable or pourable products

Technical field

The present invention relates to a kind of heat-sealable or weldable plastic sheeting butt-ended bag, it is used to hold particularly flowable or pourable products, and comprises:

Two relative sidewalls that are sealed by latasuture along its transverse edge;

The inwardly folding diapire that between the lower part of sidewall, extends, this diapire is along laterally stitch and is sealed on each sidewall along the bottom side seam at the end; With

The inwardly folding roof that extends between the top of sidewall, this roof connect along horizontal top and are connected with each sidewall and are sealed on each sidewall along pushing up to stitch.

Background technology

Such butt-ended bag is open by US-A-3935993 and DE-A1-2553854 especially.Because its splendid upright performance and stability, this bag is used for product widely, particularly liquid, pasty state, powdery and pelletized product.Yet, because known butt-ended bag is difficult to open, therefore often need a scissors or knife, perhaps in WO93/16928 and EP-A2-0380110 under the known situation, they are provided with specific output mechanism, so that discharge product at an easy rate, this makes bag more expensive, therefore, this is considered to a shortcoming of known butt-ended bag.

Above-mentioned EP-A2 0380110 also discloses a kind of butt-ended bag of the type of mentioning in the preamble of claim 1 of the present invention, wherein to connect be not peelable connection to the horizontal top between the upper rim of the upper rim of roof and each sidewall.This bag top of a sidewall therein is provided with closeable discharge nozzle, so that discharge the inclusion in the bag.

At last, WO 99/10246 discloses a kind of bag, and this bag has inwardly folding roof, and is included in the secure component of the reclosable between the upper rim of the upper rim of roof and adjacent sidewall.In diagram and described embodiment, the secure component of reclosable is formed by plastic fastener.Except the 5th page 13-14 is capable point out, the following example of the secure component of reclosable is described as: have the plastic fastener of slider, adhesive fastener, VELCRO and snap-fastener.Yet described or illustrated fastener all can not provide and be tightly connected or closure member, and airtight bag can not be provided.This fastener that provides is also complicated and more expensive.

Of the present invention briefly introducing

The butt-ended bag that the purpose of this invention is to provide a kind of the above-mentioned type, it can be easy to open without instrument, and makes simple and cheap.

Butt-ended bag according to the present invention is characterised in that it is thermosealed peelable connection that between roof and sidewall one of them laterally connects, and this peelable connection is arranged between the upper rim of the upper rim of roof and adjacent sidewall.Therefore, come bonded assembly roof and sidewall by catching by peelable connection, and spur two walls and leave, so that tear peelable connection, this bag is easy to open like this.

According to the present invention, the upper rim of roof and sidewall is extensible to exceed horizontal peelable the connection, to form gripper, is used for grasping when tearing with the peelable connection of box lunch.Except being convenient to bag opens, the advantage of this embodiment of the present invention is that the peelable bonded assembly of extending beyond of roof partly can be used as and opens the back at bag and form outlet.

And, according to the present invention, peelable connection can comprise the film band between the upper rim that is arranged in roof and sidewall, described film band securely (not peelablely) be heat sealed on one of them marginal portion, preferably be heat sealed on the marginal portion of roof, this band has the first surface of sealing medium, the sealing medium corresponds essentially to the sealing medium of adjacent bag wall, and strippingly be heat sealed on second marginal portion, preferably be heat sealed on the marginal portion of sidewall, this band has the second surface of sealing medium, and the sealing medium strippingly is heat sealed on the sealing medium of adjacent bag wall.

When the interior sealing medium of bag wall basically by polyethylene (PE) when making, the first outer gland sealing dielectric layer of film band can be made by polyethylene (PE) basically, the second outer gland sealing dielectric layer can comprise the compound of polyethylene (PE) and polybutene.The result, can obtain the secure seal between the interior polyethylene layer of the polyethylene layer of film band and adjacent bag wall, and can obtain strippable sealing between the polyethylene of second outer gland sealing dielectric layer of film band (being the compound of PE and polybutene) and adjacent bag wall, the peel strength of described peelable seals is easy to control.

And, according to the present invention, peelable connection can comprise between the upper limb that is arranged in roof and sidewall and have the film band of the first and second outer gland sealing dielectric layers, this first and second outer gland sealings dielectric layer securely (not peelablely) be heat sealed on each marginal portion, also have and one of them outer gland sealing dielectric layer bonded assembly interlayer strippingly, the tear strength of this outer gland sealing dielectric layer is lower than the peel strength between interlayer and the described sealing medium layer.Like this, seal the weak sealing medium layer on the both sides of stitching and make weak sealing medium layer and interlayer layering by tearing, thereby open peelable connection.

In the above embodiment of the present invention, what interlayer can be favourable is formed by pressure sensitive adhesive, i.e. the heat molten type self seal adhesive.As mentioned above, when opening the peelable connection of bag, interlayer exposes.Because interlayer made by self seal adhesive, can make bag again after the closure in the initial openings of bag, this layer is adhered on the relative sidewall.

And according to the present invention, peelable connection can comprise that heat molten type peels off varnish-treated tape, and it is applied ointment or plaster at least on one of them of the opposed facing surface of the upper rim of roof and sidewall.This heat molten type band is easy to apply ointment or plaster, and peelable connection is provided, and this is peeled off the bonded assembly peel strength and is easy to control.

And according to the present invention, in peelable connection, the upper rim fold-down of roof is folded, so as with the abut outer surfaces of adjacent sidewall.Downwards the free edge of folding marginal portion preferably is arranged in the peelable connection between roof and the sidewall.Folding downwards marginal portion forms cover plate, and is closed again to allow to have torn back pkt. in peelable connection.

According to the present invention, in peelable connection, the upper rim fold-down of the upper rim of roof and adjacent sidewall is laminated on the adjacent sidewall.Therefore, folding downwards marginal portion forms cover plate, to allow to have torn the back pkt. reclosable in peelable connection.

In the above-described embodiments, the upper rim of the upper rim of roof or the upper rim of roof and adjacent sidewall folds into downwards on the outside face of adjacent sidewall, and broken line can be favourable is arranged on the identical height of upper limb with the opposed edges of roof and relative sidewall.Bag has splendid stacking property as a result.

At last, according to the present invention, in peelable join domain, the upper rim fold-down of sidewall or roof is folded, so that inside face and abutment, and the wall with folding downwards marginal portion can have the outer gland sealing dielectric layer, and this outer gland sealing dielectric layer strippingly is heat sealed on the interior sealing medium layer of other wall.It is that available single film web is made bag that this embodiment of the present invention might need not any other step.

In the above embodiment of the present invention, when the interior sealing medium layer of bag wall is made by polyethylene basically, have the outer gland sealing dielectric layer of wall at folding downwards edge favourable can be copolymer, this copolymer comprises polyethylene and polypropylene.

The scope of peelable bonded assembly peel strength is from 100 to 800g/20mm, be more preferably from 200 to 600g/20mm, preferably from 300 to 500g/20mm.

Brief description

Describe the present invention in detail referring to accompanying drawing, wherein

Fig. 1 is the isometric view according to butt-ended bag of the present invention,

Fig. 2 is the lateral plan of the flat butt-ended bag of folding according to the present invention,

Fig. 3 is that for pure illustrative purposes, the wall of butt-ended bag is separated from each other along the cross sectional view of Fig. 2 center line III-III intercepting, like this, sealing place part is therebetween omitted or indicative icon, and Fig. 3 also illustrates the sidewall of bag and peelable bonded assembly first embodiment between the roof

Fig. 4 is the fragmentary sectional view corresponding to Fig. 3, and it illustrates peelable bonded assembly second embodiment,

Fig. 5 is the fragmentary sectional view corresponding to Fig. 3, and it illustrates peelable bonded assembly the 3rd embodiment,

Fig. 6 is the fragmentary sectional view corresponding to Fig. 3, and it illustrates peelable bonded assembly the 4th embodiment,

Fig. 7 be first of the embodiment shown in Fig. 5 change example corresponding to the fragmentary sectional view of Fig. 3 and

Fig. 8 is the fragmentary sectional view corresponding to Fig. 3 that second of the embodiment shown in Fig. 5 changes example.

Implement best mode of the present invention

Butt-ended bag of the present invention shown in Fig. 1 to 3 comprises a diapire 4 of 1,2, roof 3 of two relative sidewalls and positioned opposite.

Sidewall

1,2 is sealed by the latasuture 5,6 that extends along two opposed side edge.Diapire 4 is inwardly folding along diapire broken line 13, and is sealed on the

sidewall

1,2 along two relative transverse sealings 7,8.Cooresponding, roof 3 is inwardly folding along roof broken line 14, and is sealed on the sidewall 1 along last transverse sealing 11, also is connected with sidewall 2 by horizontal peelable connection 12.Horizontal peelable connection 12 and transverse sealing 11 positioned opposite, and describe in detail below.And roof 3 that folds and diapire 4 self seals, and be sealed on the sidewall along latasuture 5,6.As shown in the figure, bag also can have R-joining 9,10, and the fold domain of the diapire 4 of each R-joining from cooresponding latasuture 5,6 extends to adjacent transverse sealing 7,8 places.Each R-joining 9,10 is connected the adjacent area of

sidewall

1,2 with diapire 4.

As shown in Figures 1 to 3, upper rim 15 extensions of sidewall 2 exceed horizontal peelable connection 12 slightly.Cooresponding, the upper rim of roof 3 16 extends the horizontal peelable connection 12 that exceeds slightly between roof 3 and the sidewall 2, tears so that when opening bag when peelable connection 12, and described

marginal portion

15,16 is formed for the gripper of grasping.

As shown in Figures 1 to 3, strippable connection is included in the upper rim 16 of roof 3 and sidewall 2, film band 17 between 15, described film band is sealed on the marginal portion of roof 3 by strong sealing, and is sealed to by strippable sealing on the marginal portion 15 of sidewall 2.This feature is by being with 17 to obtain, comprise towards the first surface 18 of the sealing medium of roof 3 with 17, described sealing medium layer corresponds essentially to the sealing medium layer of the inside face 19 that forms roof 3, comprise also towards the second surface 20 of the sealing medium layer of sidewall 2 that with 17 described sealing medium strippingly is sealed on the sealing medium layer of the inside face 21 that forms sidewall 2 by heat seal.When the inside face 21 of the inside face 19 of roof 3 and sidewall 2 was made by polyethylene, the first surface 18 with 17 also can be made by polyethylene, and its second surface 20 can be formed by the compound of polyethylene and polybutene.When tearing peelable connection 12, be with 17 to remain on the roof 3, and can not stop the product in the bag to be poured out, to pour out through the upper rim 15 of sidewall 2, described part is used for forming outlet.

Although Fig. 3 represents

sidewall

1,2 and diapire and roof 4,3 and is formed by the independently film that is sealed that should understand bag can be formed by the single film web by dotted line 22 to 24 promptings.Some different plastic lamination goods can be used to make bag of the present invention.Its example comprises:

When making bag, advantageously use laminated product, so that diapire is along latasuture 5,6 self seals, with the good upright ability that obtains to wish with outer gland sealing dielectric layer and interior sealing medium layer by single film web.This can obtain by lamination co-extrusion OPP/PETP (polyester)/PE, wherein the PE layer be it seems with respect to the bag of finally making and is positioned at the inboard, and co-extrusion OPP represents co-extrusion oriented polypropylene film, and this co-extrusion oriented polypropylene film is provided with the thin sealing medium layer of the copolymer that comprises PP and PE in every side.For the barrier properties that obtains to strengthen, barrier layere, for example the aluminium film can be arranged between PETP layer and PE layer or the co-extrusion OPP film.And the PETP layer can be replaced by orientation polyamide (OPA).

In order further to increase the upright performance and the stability of bag, stronger or more stiffness films can be used for sidewall rather than diapire and roof.Then, bag is made by four sheet width of cloth.Can use laminated product same as described above, thicker laminated product is used for sidewall rather than diapire and roof.Yet, sidewall also might use PETP/PE laminated product (or PETP/PP laminated product), wherein it seems PE towards interior, and diapire and roof can use PE/PETP/PE laminated product (PP/PETP/PP laminated product) or above-mentioned co-extrusion OPP/PETP/PE laminated product with respect to bag.And in this case, PETP can be replaced by OPA, and laminated product can comprise barrier layere, for example becomes the form of aluminium film.

Should also be noted that bag can be made by single film web, and can on the filling sealing machine of vertical in form, make by four independent film webs.It can be applicable to make pre-formed bags equally, promptly lacks the ready-made bag of a latasuture.

Fig. 4 is illustrated in second embodiment of the peelable connection 32 between the upper rim 16 of the upper rim 15 of sidewall 2 and roof 3.This peelable connection 32 comprises the film band 37 that is arranged between two

marginal portions

15 and 16, and have the first surface layer 28 and a second surface layer 29 of sealing medium, the sealing medium is corresponding to the sealing medium of the inside face that forms roof 3 and the sealing medium layer of the inside face 20 that forms sidewall 2, like this, the not peelable underground heat of described film band is sealed on the described surface.Interlayer 30 is arranged between two superficial layers 28 and 29, and strippingly is connected with second surface layer 29, and preferably is connected with first surface layer 28 very securely.And the tear resistance of second surface layer 29 is lower than the peel strength between described layer and the interlayer 30.When strippable connection 32 was torn in

marginal portion

15,16 pulling, layer 29 was peelled off along the horizontal edge of seam 31, and this laterally stitches the edge corresponding to the sealing tool that uses, 31 edge.And, in the part corresponding to sealing area, between layer 29 and interlayer 30 layering takes place.Push down the counterpart of the marginal portion 15 of sidewall 2 by the expose portion that makes interlayer 30, after bag was initially torn, the interlayer 30 of working pressure sensitive adhesive allows peelable connection 32 so that bag is closed once more.

Fig. 5 represents the 3rd embodiment of peelable connection 42.This peelable connection comprises the hot melt band 47 on the inside face 19 of the upper rim 16 that acts on roof 3.By starting hot melt by sealing tool, width is arranged on corresponding to the peelable connection 42 of sealing tool width in the lateral seal area 41 between the marginal portion 16 of the marginal portion 15 of sidewall 2 and roof 3.

Fig. 6 is illustrated in the 4th embodiment of the strippable connection 52 between the upper rim 36 of the upper rim 15 of sidewall and roof 3.The upper rim 36 of roof is folding downwards so that make inside face and abutment, and like this, the outside face 38 of roof 3 is in the face of the inside face 20 of sidewall 3.When the outside face 38 of roof 3 when strippingly being sealed to sealing medium on the inside surface of side wall 20 and making, strippable connection 52 is arranged in the lateral seal area 51, the width of this lateral seal area is corresponding to the width of sealing tool, and the sealing instrument is used for the upper rim 36 of roof 3 is sealed on the upper rim 15 of sidewall 2.In this embodiment of peelable bonded assembly, roof 3 and sidewall 2 advantageously use above-mentioned co-extrusion OPP/PETP/PEC laminated product.

In the above-described embodiments, the plastic fastener of the slide fastener elements that comprising friction tightly to reclose closes can be arranged in strippable connection 12,32,42, on 52, described element by the facing surfaces carrying of the marginal portion of the upper rim of sidewall 2 and roof 3, has the bag of the ability of closing of can reclosing so that provide respectively.The mode that slide fastener elements can be known basically altogether and each upper rim monolithic molding, or be arranged on the slide fastener elements band, this slide fastener elements band is sealed on each upper rim.

Fig. 7 represents to change example with reference to first of the described embodiment of Fig. 5.In this changed example, the upper end of roof 3 was provided with extendible portion 53, and this extendible portion 53 (at figure notation 59 places) folds into downwards on the outside face of upper rim 15 of sidewall 2.The free edge 54 of extendible portion 53 is stitching on 41 so that the strippable connection 42 between sidewall 2 and the roof 3 to be provided.Extendible portion 53 has formed the cover plate on the bag like this, to allow the having ability of closing of reclosing.

Cover plate or extendible portion 53 also are sealed on the outside face of sidewall 2 in the zone of latasuture 5,6 of sidewall.On the material of the inside face by suitably select forming roof 3 and the outside face of sidewall, the cover plate melt-sealed sidewall 2 in the zone of latasuture 5,6, therefore can obtain best rejoined ability.

Should note in variation example shown in Figure 7, and in the described embodiment of Fig. 1 to 4, the connection 12,32 of reclosable can be used for replacing the connection 42 of the described embodiment of Fig. 5.

And, should notice that broken line 59 also can be arranged on the relative free edge equal height with roof and relative sidewall, changes example below in conjunction with another and is described.

Fig. 8 represents to change example with reference to second of figure 5 described embodiment.In this embodiment, the upper rim 58 of the upper rim 60 of roof 3 and sidewall 2 jointly folds on the sidewall downwards at figure notation 55 places.Broken line 55 is basically on the height identical with the upper limb 56 of the opposed edges 61 of roof 3 and relative sidewall 1.By arrange broken line 55 on equal height, the upper limb 56 of the opposed edges 61 of roof and relative sidewall 1 can provide to have good stackable bag.The following free edge of the downward folded edge part 58,60 in top extends beyond peelable connection 42, and this peelable connection 42 is arranged between roof 3 and the sidewall 2 by sealing area 41.

Should also be noted that hot melt band 47 ' extends on the downward folded edge part 60 of roof 3.Like this, when peelable connection 42 was arranged in the sealing area 41, additional peelable connection was arranged between the downward folded edge part 58,60 in the corresponding seal area 57.

Also note that in the variation example shown in Figure 8 that the reclosable of the described embodiment of Fig. 1 to 4 connection 12,32 can be used to replace the connection 42 of the described embodiment of Fig. 5.

Claims

1. heat-sealable or weldable plastic sheeting butt-ended bag, it is used to hold particularly can flow or pourable product, and comprises:

Two the relative sidewalls (1,2) that are sealed along its transverse edge by latasuture (5,6);

The inwardly folding diapire (4) that extends between the lower part of sidewall (1,2), this diapire are also along laterally stitch (7,8) and is sealed on each sidewall (1,2) along the bottom side seam at the end; With

The inside folding roof (3) that extends between the top of sidewall (1,2), this roof edge laterally top connection (11,12) are sealed on each sidewall (1,2) with each sidewall (1,2) connection and along the top side seam,

It is characterized in that one of them horizontal connection the between roof (3) and sidewall is the peelable connection (12 of heat seal, 32,42,52), this peelable connection is arranged between the upper rim (15) of the upper rim (16,36) of roof (3) and adjacent sidewall (2).

2. butt-ended bag as claimed in claim 1 is characterized in that the upper rim (16,36 of roof (3) and sidewall (2); 15) extend beyond horizontal peelable connection (12,32,42,52), to form gripper.

3. butt-ended bag as claimed in claim 1, it is characterized in that peelable connection (12) comprises the upper rim (16 that is arranged in roof (3) and sidewall (2), 15) the film band (17) between, described film band securely (not peelablely) be heat sealed on one of them marginal portion, preferably be heat sealed on the marginal portion of roof (3), this band (17) has the first surface (18) of sealing medium, the sealing medium corresponds essentially to the sealing medium of adjacent bag wall (3), and strippingly be heat sealed on second marginal portion, preferably be heat sealed on the marginal portion (15) of sidewall (2), this band (17) has the second surface (20) of sealing medium, and the sealing medium strippingly is heat sealed on the sealing medium of adjacent bag wall.

4. butt-ended bag as claimed in claim 3, wherein the interior sealing medium of bag wall is made by polyethylene (PE) basically, and the first outer gland sealing dielectric layer (18) that it is characterized in that film band (17) comprises the compound of polyethylene and polybutene.

5. butt-ended bag as claimed in claim 1, it is characterized in that peelable connection (32) comprises the upper limb (16 that is arranged in roof (3) and sidewall (2), 15) between and have first and second outer gland sealing dielectric layers (28,29) film band (37), by this this film band of first and second outer gland sealings dielectric layer securely (not peelablely) be heat sealed to each marginal portion (16,15) on, also have and one of them outer gland sealing dielectric layer bonded assembly interlayer (30) strippingly, the tear strength of this outer gland sealing dielectric layer is lower than the peel strength between interlayer (30) and the described sealing medium layer.

6. butt-ended bag as claimed in claim 5 is characterized in that interlayer (30) is a pressure sensitive adhesive.

7. butt-ended bag as claimed in claim 1, it is characterized in that peelable connection (42) comprises that heat molten type peels off band, this heat molten type is peeled off band and is applied ointment or plaster at least on one of them of two opposed facing surfaces (19,20) of the upper rim (16,15) of roof (3) and sidewall (2).

8. butt-ended bag as claimed in claim 1 is characterized in that in peelable connection (42), and the upper rim of roof (53) is folding downwards, so as with the abut outer surfaces of adjacent sidewall (2).

9. butt-ended bag as claimed in claim 1 is characterized in that in peelable connection (42), and the upper rim (58) of the upper rim (60) of roof (3) and adjacent sidewall (2) folds into downwards on the adjacent sidewall (2).

10. butt-ended bag as claimed in claim 1, it is characterized in that in peelable connection (52) zone, the upper rim (36) of sidewall or roof (3) is folding downwards, so that inside face and abutment, and the wall (3) with folding downwards marginal portion (36) has the outer gland sealing dielectric layer, and this outer gland sealing dielectric layer strippingly is heat sealed on the interior sealing medium layer (20) of other wall (2).