DE60003026T2 - UPRIGHT BAG FOR FLOWABLE PRODUCTS - Google Patents

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 83) and an upper edge portion (15) of the adjacent side wall (2).

Description

Technical field

The invention relates to a standing Pouch made from a heat sealable or weldable Plastic film, in particular for receiving flowable or castable Products that have:

• - two opposing Side walls, the longitudinal side edges the same by means of side seams are sealed together;
• - one inwardly folded bottom wall, which is between the lower sections of the side walls extends and with the respective side walls along transverse bottom seams and sealed along the bottom side seams is; and
• - one inwardly folded top wall that lies between the top sections of the side walls extends and with the respective side walls along transverse upper connections is connected and sealed to the respective side walls along the top seams is.

Technical background

Standing pouches of this type are inter alia from US-A-3,935,993 and DE-A1-25 53 854 known. As a result of their excellent standing properties and stability are the bags for a wide range of products have been used, in particular for liquid, paste, powder and grained Products. However, it is a disadvantage of the known standing pouch viewed as difficult to open are, which is why often a pair of scissors or a knife is required will, or they are - like for Example known from WO 93/16928 and EP-A2-0 380 110 - with special outlet arrangements for easy removal of the product, which makes the bag more expensive makes.

The above EP-A2-0 380 110 discloses also a standing pouch of the type defined in the preamble of the claim 1 of the present invention, and wherein the transverse upper connections between the upper edge portions of the upper Wall and the upper edge sections of the respective side walls are not peelable connections are. The pouch is for pouring out the Contents of the bag with a closable drain spout in the upper Section of one of the side walls Mistake.

Finally WO 95/10246 discloses a pouch that has an inwardly folded top wall and the one resealable Fastener between the upper edge portion of the upper Wall and an upper edge portion of the adjacent side wall having. In the embodiment shown and described there is the resealable Fastener made of a plastic zipper. In addition, on page 5, lines 13-14 the following examples of reclosable fasteners mentioned: a Plastic zipper with one slider, an adhesive fastener, a Velcro fastener and snap fasteners. however is not one of the mentioned or fasteners shown capable of gas-tight Connection or gas-tight seal and consequently a gas-tight Provide bags. The provision of such fasteners is also both difficult and expensive.

Brief description of the invention

The object of the invention is to provide a standing pouch of the above type, which without Easy to open tools is simple and inexpensive is to be produced.

The standing pouch according to the invention is thereby characterized that at least one of the transverse connections between the top wall and the side walls a heat sealed peelable Connection is between an upper edge portion of the upper Wall and an upper edge portion of the adjacent side wall is provided. The bag is easily opened by the top wall and the side wall are gripped by means of the peelable connection are connected, and the two walls are pulled apart so that the peelable connection is disconnected.

According to the upper edge sections the top wall and the side wall over the transversal peelable Extend the connection to form gripping members that are gripped if the peelable connection is to be disconnected. In addition to Facilitating opening the bag is this embodiment the invention advantageous in that the section of the upper Wall that is over the peelable connection extends, can serve one Spout too form after the bag is opened has been.

Furthermore, the peelable connection according to the invention Have film strips between the top edge portions the top wall and the side walls is arranged, the film strip fixed (not removable) is heat sealed to one of the edge portions, preferably to the edge portion of the top wall, the strip being a first surface a sealing medium which is essentially the sealing medium corresponds to the adjacent wall of the bag and is removable on the second Edge section heat sealed , preferably the edge portion of the side wall, the Strip a second surface a sealing medium that is peelable on the sealing medium the adjacent pouch wall is heat sealed is.

If the inner sealing medium of the bag walls is essentially made of polyethylene (PE) stands, the first outer sealing medium layer of the film strip can consist essentially of polyethylene (PE), and its second outer sealing medium layer can have a mixture of polyethylene (PE) and polybutylene. As a result, a tight seal is obtained between the polyethylene layer of the film strip and the inner polyethylene layer of the adjacent bag wall, while a peelable seal is obtained between the second outer sealing medium layer (which is a mixture of PE and polybutylene) of the film strip and the polyethylene of the adjacent bag wall, the peel strength of the peelable seal is easy to control.

moreover According to the invention, the peelable connection can have a film strip which arranged between the upper edges of the top wall and the side wall and has a first and a second outer sealing medium layer, with which it is fixed (not removable) with the respective edge sections heat sealed , and further comprises an intermediate layer, which with at least one of the outer sealant layers is removably connected, which has a tensile strength that is weaker than the peel strength between the intermediate layer and the sealant layer is. The peelable connection is consequently made by tearing the weak sealant layer on both sides of the seal seam and through an exfoliation opened between the weak sealing medium layer and the intermediate layer.

In the above embodiment According to the invention, the intermediate layer can advantageously consist of a Pressure sensitive adhesives exist, e.g. B. a self-sealing adhesive of the hot melt type. How The intermediate layer described above is exposed when the peelable Bag connection opened becomes. Because the intermediate layer is made of a self-sealing adhesive the layer adheres to the opposite one after the bag is initially opened Side wall to allow the bag to be reclosed.

Furthermore, the peelable connection according to the invention Peel-off paint strips of the hot-melt type have at least one of the mutually facing surfaces the top wall and the top edge portions of the side wall is applied. Such a hot melt strip is easy to apply and provides the peelable connections with a Peel strength that is easy to control.

moreover can according to the invention on the removable Connection of the upper edge portion of the upper wall bent over be going to the outside to abut the adjacent side wall. The free edge of the bent Edge section is preferably over the peelable connection between the top wall and the side wall. The bent edge section forms a brim to allow the bag to reclose, after the peelable connection has been opened.

According to the invention on the peelable connection can both the top edge portion of the top wall and the top Edge section of the adjacent side wall onto the adjacent one Side wall can be bent. Form the bent edge sections thereby a brim to allow the bag to be reclosed, after the peelable connection has been opened.

In the above embodiments, in which the top edge portion of the top wall or both the top edge portion of the top wall as well as the top edge portion the adjacent side wall to the outside of the adjacent side wall are bent, the fold can advantageously at the same level like the opposite Edge of the top wall and the top edge of the opposite Sidewall may be provided. As a result, the bag comes with a excellent stackability.

Finally, in the field of peelable connection according to the invention the upper edge section either the side wall or the top wall for bumping from the inside be bent on the inside, and the wall with the bent Edge section may have an outer sealant layer have the peelable on the inner sealing medium layer of the other wall heat sealed is. This embodiment the invention makes it possible the bag from a single sheet of film without further steps manufacture.

In the above embodiment the outer sealing medium layer of the invention the wall with the bent edge advantageously a copolymer be made of polyethylene and polypropylene when the inner Sealing medium layer of the bag walls essentially made of polyethylene consists.

The peel strength of the peelable Connections can be between 100 and 800 g / 20 mm, preferably between 200 and 600 g / 20 mm and most preferably between 300 and 500 g / 20 mm lie.

Short description of the drawings

The invention is described in detail below explained with reference to the drawings. Show it:

1 2 is an isometric view of a standing pouch according to the invention,

2 a side view of a compressed standing pouch according to the invention,

3 a sectional view taken along the line III-III in 2 , wherein the walls of the standing pouch are separated from one another for purely illustrative purposes and the seals in between are therefore partially omitted or shown schematically be, where 3 further shows a first embodiment of a peelable connection between a side wall and an upper wall of the bag,

4 a partial sectional view 3 to represent a second embodiment of a peelable connection,

5 a partial sectional view 3 to represent a third embodiment of the peelable connection,

6 a partial sectional view 3 corresponds to represent a fourth embodiment of a peelable connection,

7 a partial sectional view 3 corresponds, by a first modification of the in 5 embodiment shown, and

8th a partial sectional view 3 corresponds to a second modification of the in 5 shown embodiment.

Best kind of execution the invention

The standing pouch according to the invention, which in the 1 to 3 is shown has two opposite side walls 1 . 2 , an upper wall 3 and a bottom wall 4 on, which are arranged opposite to each other. The sidewalls 1 . 2 are by means of side seams 5 . 6 sealed together, which extend along two opposite side edges. The bottom wall 4 is along a bottom wall fold 13 folded inwards and with the side walls 1 . 2 along two opposite transverse seams 7 . 8th sealed. The top wall is corresponding 3 along an upper wall fold 14 folded inwards and with the side wall 1 along an upper transverse seal 11 sealed and with the side wall 2 by means of a transverse peelable connection 12 connected. The transversal peelable connection 12 is opposite to the transverse poem 11 arranged and is explained in detail below. Furthermore, both the folded top wall 3 and the folded bottom wall 4 with itself and with the side walls along the side seams 5 . 6 sealed. As shown, the bag can also have sloping seams 9 . 10 have, each from the fold area of the bottom wall 4 in the respective side seam 5 . 6 to the adjacent transverse sutures 7 . 8th extend. Each of the sloping seams 9 . 10 connects a side wall 1 . 2 with the adjacent area of the bottom wall 4 ,

As in the 1 to 3 shown, an upper edge portion extends 15 the side wall 2 slightly across the transverse peelable connection 12 out. An upper edge section extends accordingly 16 the top wall 3 slightly across the transverse peelable connection 12 between the top wall 13 and the side wall 2 addition, the edge portions 15 . 16 Form gripping members to be gripped when the peelable connection 12 to open the bag.

As in the 1 to 3 shown, the peelable connection has a film strip 17 between the upper edge sections 16 . 15 the top wall 3 and the side wall 2 on, the film strip with the edge portion of the top wall 3 sealed with a strong gasket and with the edge section 15 the side wall 2 is sealed by means of a removable seal. This feature is due to the stripe 17 get that of a first surface 18 of a sealing medium facing the upper wall 3 points, wherein the sealing medium layer substantially corresponds to the sealing medium layer that the inner surface 19 the top wall 3 forms, and further a second surface 20 a sealing medium layer facing the side wall 2 has, the sealing medium peelable by heat sealing with the sealing medium layer that seals the inner surface 21 the side wall 2 forms. If the inner surface 19 the top wall 3 and the inner surface 21 the side wall 2 is made of polyethylene, the first surface 18 of the strip 17 also consist of polyethylene, during its second surface 20 can consist of a mixture of polyethylene and polybutylene. Like the peelable connection 12 the strip remains 17 on the top wall 3 and does not interfere with the drainage of the product in the bag, the drainage through the upper edge portion 15 the side wall 2 takes place, the section serving as a mold spout.

Even though 3 represents the side walls 1 . 2 and the bottom and top walls 4 . 3 consist of separate foils sealed together, it should be understood that the pouch can consist of a single sheet of foil, such as by means of the dotted lines 22 to 24 proposed. Several different plastic laminates can be used for the production of the bag according to the invention. Examples include:

If the bag is made from a single sheet of film, it is advantageous to use a laminate that has both an outer and an inner sealant layer so that the bottom wall is self-contained along the side seams 5 . 6 is sealed in order to maintain the intended good stability. This can be obtained by means of the coex OPP / PETP (polyester) / PE laminate, in which the PE layer is on the inside, in relation to finished bags, and coex OPP denotes a co-extruded oriented polypropylene film that is coated with a thin film Sealant layer is provided and has a copolymer of PP and PE on each side. In order to obtain improved barrier properties, a barrier layer, e.g. For example, an aluminum foil can be provided between the PETP layer and the PE layer or the coex OPP foil. Furthermore, the PETP layer can be replaced by an oriented polyamide (OPA).

To the standing properties and stability of the bag further increase can for the side walls a stronger one or stiffer film than for the bottom and top walls be used. The bag then consists of four sheets of film. They can be the same Laminates are used as mentioned above, being thicker for the side walls Laminates than for the bottom and top walls be used. However, it is also possible to use a PETP / PE laminate (or PETP / PP laminate) for the side walls, where PE faces inwards, in relation to the bag, and a PE / PETP / PE laminate (PP / PETP / PP laminate) or the above coex OPP / PETP / PE laminate for the lower and upper walls to use. In this case too, PETP can be replaced by OPA and the laminates can for example have a barrier layer in the form of an aluminum foil.

It should also be noted that the bag from a single film web and from four separate film webs on a vertical molding, filling and sealing machine can be formed. The same applies to the manufacture of pre-made Bags too, d. H. apart from a side seam, ready for use Bags.

4 represents a second embodiment of a peelable connection 32 between the upper edge section 15 the side wall 2 and the upper edge portion 16 the top wall 3 This peelable connection 32 has a film strip 37 on that between the two edge sections 15 and 16 is arranged and a first surface layer 28 and a second surface layer 29 of a sealing medium that the sealing medium that the inner surface 19 the top wall 3 forms, and corresponds to the sealant layer that corresponds to the inner surface 20 the side wall 2 forms, the film strip is therefore not peelable heat-sealed to the surfaces. An intermediate layer 30 is between the two surface layers 28 and 29 provided and is peelable with the second surface layer 29 connected and preferably to the first surface layer 28 more firmly connected. Furthermore, the tensile strength of the second surface layer 29 weaker than the peel strength between the layer and the intermediate layer 30 , If at the edge sections 15 . 16 is pulled to the peelable connection 32 to open up the layer 29 along the edges of the transverse seam 31 torn that corresponds to the edges of the sealing tool used. There is also an exfoliation between the layers 29 and the intermediate layer 30 in the section that corresponds to the sealing zone. The use of an intermediate layer 30 the peelable connection can be resealed from a pressure-sensitive adhesive 32 and consequently the pouch after its initial opening by the exposed portion of the intermediate layer 30 against the corresponding section of the edge section 15 the side wall 2 is pressed.

5 represents a third embodiment of a peelable connection 42 This peelable connection has a hot melt strip 47 on that on the inner surface 19 of the upper edge section 16 the top wall 3 is applied. By activating the hot melt using sealing tools, the peelable connection becomes 42 with a width that corresponds to the width of the sealing tools, between the edge section 15 the side wall 2 and the edge section 16 the top wall 3 in the transverse sealing zone 41 provided.

6 represents a fourth embodiment of a peelable connection 52 between the upper edge section 15 the side wall and the upper edge portion 36 the top wall 3 The upper edge section 36 the upper wall is bent so that the outer surface from the inside to the inside 38 the top wall 3 to the inner surface 20 the side wall 3 has. Because the outer surface 38 the top wall 3 consists of a sealing medium that is removable with the inner surface 20 seals the side wall, the peelable connection 52 in a transverse sealing zone 51 provided with a width corresponding to the width of the sealing tool used around the top edge portion 36 the top wall 3 with the top edge section 15 the side wall 2 seal. In this embodiment of the peelable joint it is advantageous to use the above coex OPP / PETP / PE laminate for the top wall 3 and the side wall 2 to use.

In the embodiments described above, a plastic zipper, which has paired, reclosable zipper elements, can be over the peelable connection 12 . 32 . 42 . 52 be arranged with the elements through the opposite surfaces of the upper edge portion of the side wall 2 or the edge section of the upper wall 3 be held to provide the bag with a resealability. In a manner known as such, the zipper elements can be formed integrally with the respective upper edge section, or can be arranged on zipper element strips which are sealed with the respective upper edge sections.

7 FIG. 11 illustrates a first modification of the embodiment described with reference to FIG 5 is described. In this modification, the top end portion is the top wall 3 with an extension 53 provided that (at reference number 59 ) on the outside of the upper edge section 15 the side wall 2 is bent. The free edge 54 of the extension 53 is over the seam 41 that the peelable connection 42 between the side wall 2 and the top wall 3 provides. The process 53 consequently forms a brim on the bag, which is a how which allows closability.

The brim or the extension 53 is also with the outside of the side wall 2 in the area of the side seams 5 . 6 sealed the side wall. By choosing the material that suits the inner surface of the top wall 3 and forms the outer surface of the side wall, the brim becomes with the side wall 2 in the area of the side seams 5 . 6 melt-sealed, which ensures optimum resealability.

It should be noted that in the 7 Modification also shown the embodiments with reference to the 1 to 4 be described, the reclosable connections 12 . 32 instead of referring to 5 Embodiment 42 described can be used.

It should also be noted that the fold 59 may also be located at the same height as the opposite free edge of the top wall and the opposite side wall, as described below in connection with another modification.

8th presents a second modification of FIG 5 Embodiment described. In this modification are the upper edge portion 60 the top wall 3 and the top edge portion 58 the side wall 2 connected to the side wall at reference number 55 bent. The fold 55 is substantially at the same level as the opposite edge 61 the top wall 3 and the top edge 56 the opposite side wall 1 , By folding 55 , the opposite edge 61 the top wall and the top edge 56 the opposite side wall 1 arranged at the same height, a bag with good stackability is provided. The lower free edges of the upper bent edge sections 58 . 60 extend beyond the peelable connection 42 which is between the top wall 3 and the side wall 2 through the sealing zone 41 provided.

It should also be noted that the hot melt strip 47 on the bent edge section 60 the top wall 3 extends. Consequently, at the same time as the peelable connection 42 in the sealing zone 41 is provided, an additional peelable connection between the bent edge portions 58 . 60 in an appropriate sealing zone 57 provided.

It should be noted that also in the 8th modification shown with reference to the 1 to 4 of the reclosable connections 12 . 32 described embodiments instead of with reference to FIG 5 described embodiment 42 can be used.

Claims (10)

Standing pouch made of a heat-sealable or weldable plastic film, in particular for holding flowable or pourable products, which has: - two opposite side walls ( 1 . 2 ) along the side edges of the same by means of side seams ( 5 . 6 ) are sealed together; - a bottom wall folded inwards ( 4 ) located between the lower sections of the side walls ( 1 . 2 ) extends and with the respective side walls ( 1 . 2 ) along transverse bottom seams ( 7 . 8th ) and sealed along the bottom side seams; and - an inwardly folded top wall ( 3 ) located between the upper sections of the side walls ( 1 . 2 ) extends and with the respective side walls ( 1 . 2 ) along transverse upper connections ( 11 . 12 ) is connected and with the respective side walls ( 1 . 2 ) is sealed along the upper side seams, characterized in that at least one of the transverse connections between the upper wall ( 3 ) and the side walls a heat-sealed peelable connection ( 12 . 32 . 42 . 52 ) between an upper edge section ( 16 . 36 ) the top wall ( 3 ) and an upper edge section ( 15 ) the adjacent side wall ( 2 ) is provided. A standing pouch according to claim 1, characterized in that the upper edge sections ( 16 . 36 ; 15 ) the top wall ( 3 ) and the side walls ( 2 ) via the transversal peelable connection ( 12 . 32 . 42 . 52 ) extend out to form gripping members. Standing bag according to claim 1 or 2, characterized in that the peelable connection ( 12 ) a film strip ( 17 ), which between the upper edge sections ( 16 . 15 ) the top wall ( 3 ) and the side wall ( 2 ) is arranged, the film strip being fixed (not removable) to one of the edge sections, preferably to the edge section of the upper wall ( 3 ) is heat sealed, with the strip ( 17 ) a first surface ( 18 ) of a sealing medium which essentially corresponds to the sealing medium of the adjacent bag wall ( 3 ) corresponds and removable with the second edge section, preferably the edge section ( 15 ) the side wall ( 2 ) is heat sealed, with the strip ( 17 ) a second surface ( 20 ) of a sealing medium which is peelably heat-sealed with the sealing medium of the adjacent bag wall. A standing pouch according to claim 3, wherein the inner sealing medium of the pouch walls consists essentially of polyethylene (PE), characterized in that the first outer sealing medium layer ( 18 ) of the film strip ( 17 ) a Wed has PE and polybutylene. Standing bag according to claim 1 or 2, characterized in that the peelable connection ( 32 ) a film strip ( 37 ) between the top edges ( 16 . 15 ) the top wall ( 3 ) and the side wall ( 2 ) is arranged and a first and a second outer sealing medium layer ( 28 . 29 ) with which it is fixed (not removable) with the respective edge sections ( 16 . 15 ) is heat sealed, and further an intermediate layer ( 30 ), which is peelably connected to at least one of the outer sealing medium layers, which has a tensile strength that is weaker than the peel strength between the intermediate layer ( 30 ) and the sealing medium layer. Standing bag according to claim 5, characterized in that the intermediate layer ( 30 ) is a pressure sensitive adhesive. Standing bag according to claim 1 or 2, characterized in that the peelable connection ( 42 ) has a peelable strip of the hot melt type, which stripes on at least one of the two mutually facing surfaces ( 19 . 20 ) of the upper edge sections ( 16 . 15 ) the top wall ( 3 ) and the side wall ( 2 ) is applied. Standing pouch according to one of the preceding claims, characterized in that over the peelable connection ( 42 ) the upper edge section ( 53 ) the upper wall is bent over to the outside of the adjacent side wall ( 2 ). Standing bag according to one of claims 1 to 8, characterized in that over the peelable connection ( 42 ) both the upper edge sections ( 60 ) the top wall ( 3 ) as well as the upper edge sections ( 58 ) the adjacent side wall ( 2 ) on the adjacent side wall ( 2 ) are bent. Standing bag according to claim 1 or 2, characterized in that in the region of the peelable connection ( 52 ) the upper edge section ( 36 ) the side wall or top wall ( 3 ) is bent over from the inside to the inside and that the wall ( 3 ) with the bent edge section ( 36 ) has an outer sealant layer that is peelable with the inner sealant layer ( 20 ) the other wall ( 2 ) is heat sealed.