JP2010159089A - Manufacturing method for foil bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for foil bags, which enables, with a high degree of through-put, the formation of a foil bag provided with a grip band, by and through an easy and reliable system. <P>SOLUTION: The manufacturing method for foil bags includes, within a process of fixing an element strap 2 to be provided as a grip band, a step of supplying a linear element strap 2 under a state of not being folded, then a step of its end portion 2a being folded, with the folded end of the element strap being placed, through a swinging movement, on an element belt provided for forming a foil bag, while being connected with this element belt through a friction bonding. Simultaneously, the swinging movement is performed around an oscillating axis that extends outside the folded element strap, while the oscillating axis is diagonally turned so that the oscillating axis is extended, with respect to the plane face standard of the element belt, in the longitudinal direction of the element belt from the plane face standard to be tilted fully enough for a set tilting angle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to the manufacture of a foil bag comprising at least one grip band.

  A foil bag having a grip band can be easily carried even in the case of a large weight. From practical experience, foil bags that are open at the top end are known as well as simple shopping bags or foil packaging bags that are closed before the contents are removed.

  A method for manufacturing a foil bag having an open end is known from US Pat. A material strap formed from a hot-sealable foil is first folded into a U shape and then placed in a separate method step on a transport sheet piece (Traegerzettel). The transport grip thus prefabricated is then secured to the bag foil before and after the formation of the foil tube. In that case, the conveyance grip can be arranged on the inner side or the outer side of the foil bag to be formed. Since this carrying grip has to be pre-processed by several method steps on various devices, the described method is expensive. In particular, the speed to be achieved is limited by the necessary preparation of the pre-machined transport grip.

  Patent document 2 relates to a foil bag having at least one transport grip and a bag seat (Beutelflaeche) made of a hot-sealable foil. In that case, the bag sheet is provided with a layer on the inner side of the bag made of a material that can be hot-sealed. The bag sheet is provided with a window-like opening at a distance from the edge of the foil bag, and the opening is covered by a foil sheet piece. In that case, the foil sheet piece is fixed to the inner layer of the hot-sealable foil of the bag sheet. At least one transport grip is sealed on the foil sheet piece from the outside in the region of the opening with its end. According to known embodiments, it is possible to form a closed foil packaging bag. This foil wrapping bag has on its outer surface a layer that cannot be sealed or is difficult to seal, in which case the transport grip that is placed on the foil bag is connected to the bag foil via the foil sheet piece. It is connected to (kraftschluessig) by frictional connection. From practical experience, it has proven difficult to manufacture the described bag and in particular to supply and secure the transport grip.

US patent US 3 850 724 European patent application specification EP 1 712 482 A1

  In such a background, an object of the present invention is to provide a method of manufacturing a foil bag that enables a foil bag having a grip band to be formed with high efficiency by an easy and reliable method.

  The solution of the subject matter and problem of the present invention is provided in a method for manufacturing a foil bag, in a method step for fixing a material strap provided as a grip band, in a state where the straight material strap is not folded, and The end is then folded, and the folded end of the material strap is placed on the material band provided for the formation of the foil bag by a swinging motion and is joined to this material band by frictional coupling. The swinging motion is performed around the swinging shaft extending outside the folded material strap, and the swinging shaft is inclined from the plane standard to the longitudinal direction of the material strip with respect to the plane standard of the material strip. The method is characterized in that the rocking shaft is inclined obliquely so as to be inclined by an angle. In accordance with the invention, the folded material strap is fed from the side to the intended fixed location by rotation around an oscillating shaft placed on the outside. By tilting the rocking axis with respect to the plane standard of the material strip, the material strap is additionally submerged and thereby placed on the material strip with its ends, so that immediately after In addition, the end can be fixed to the material strip. With the method according to the invention, the supply from the side and the subsidence by a rocking motion about a rocking shaft inclined at an inclination angle in the longitudinal direction of the material strip are combined. While securing the end of the material strap to the material strip, the material strip and the material strap are stopped in a proper manner. Therefore, in order to manufacture a large number of foil bags, the material band is periodically operated.

  Usually, the material strap is folded so that the folded end portion and the central portion connecting the end portions are in one plane. Within the scope of such embodiments, it is preferably intended that the pivot axis is essentially perpendicular to this plane.

  The material strap is held by an arm, a holder, a carrier or the like so that the folded material strap can be rotated around the swing axis.

  The inclination angle is preferably between 3 ° and 30 °, particularly preferably between 10 ° and 20 °. At that time, only a relatively small settlement occurs at a small inclination angle, and at a large inclination angle, the end portion of the material strap may be bent without being controlled during placement and may not be fixed. It should be noted that there is a danger.

  The material strap is held on an arm, carrier, or the like in an appropriate manner so that the material strap can be rotated about the swing axis. At that time, the material strap is folded in the first period, and the folded material strap is placed on the material band in the second period of the swinging operation, and the appropriate fixed type or It is particularly within the framework of the invention that a folding device is provided that rotates together. If one rocking motion is scheduled for a plurality of periods, this rocking motion is preferably performed periodically. Eventually, multiple material straps are placed on the holder or carrier, etc., and these material straps are placed on the material band that is periodically moved in the transport direction along its own longitudinal direction, and as an option It is intended to be folded further before that.

  In accordance with a preferred form of the invention, for the manufacture of a foil bag, two grip bands are provided which are arranged on opposite surface surfaces of the foil bag. Correspondingly, usually two material straps are supplied, folded and secured to form a foil bag.

  The method for the manufacture of the foil bag, according to a preferred embodiment, as a further method step, supplying the bag foil, preferably providing an opening in the bag foil by stamping, covering the opening Fixing at least one foil sheet piece to the first surface of the bag foil, folding the bag foil into a material strip formed as a foil tube, with the foil sheet piece inside the foil tube Arranged and accessible through at least one assigned opening, the folded end of the material strap is fixed to at least one foil sheet piece, whereby the end is assigned to the foil sheet piece Coupled with bag foil by friction coupling through And the foil bag is cut off from the material strip. Particularly preferably, the individual method steps are carried out in the order described. In so doing, it is intended that the bag foil is first folded before the grip band is secured to the material band that is folded into the foil tube. Preferably, in this case, the blank is provided with a side fold extending in the longitudinal direction, this side fold being formed, for example, by a suitably positioned sword (Schwert) and forming shoulder (Formschulter). Can be done.

  The method according to the invention makes it possible to produce a foil bag known from US Pat. In order to secure the material straps as grip bands on both sides of the foil tube, it is intended to supply the material straps on each side of the material strip in an appropriate manner.

  According to an alternative embodiment of the method according to the invention, only one material strap is scheduled during the formation of the foil bag, or the material strap is placed on the bag foil as a material band before the formation of the foil tube. It is basically intended to be fixed. In that case, the folded material straps are placed side by side on the material belt for one foil bag, so that one foil bag with two grip bands located on the outside can be manufactured, The bag foil is then folded into the foil tube so that the grip band is located on the outside.

  Bonding the end of the material strap with the bag foil by frictional bonding, forming a hose-shaped material band and securing the foil sheet piece to the bag foil are within the intended scope, preferably hot sealing In doing so, each surface to be bonded must be properly hot-sealable. Hot sealing is generally understood within the scope of the present invention as local Stoffschluessig bonding by pressure and / or temperature effects. In addition to the usual heated sealing shoe, other methods can also be used for this, for example ultrasonic coupling or high-frequency coupling. The coupling by friction coupling can be formed by a plurality of seals. Therefore, the ends of the material strap are first attached by ultrasonic bonding and then firmly bonded by one or more seals with a hot sealing shoe.

  Preferably, the material strap as a grip band is brought on the bag foil so that the end joined to the bag foil faces the transport direction, i.e. the feed direction. Such orientation can prevent the central portion of the material strap from being unintentionally raised and caught during further operations. Furthermore, it can be intended to fix the material strap to the bag foil in addition to the frictional connection at its end, for example by hot melt adhesive. This additional anchoring is usually useful for minor operations during manufacturing. For this reason, it is sufficient to stick a material strap with a bag foil, limited to a certain point. The additional connection in particular ensures that the grip fits snugly in the bag during processing and does not go up. For this reason, the fixing point exists at or near the grip portion at the center of the material strap. However, this additional anchoring is usually not useful in accepting the traction forces that act in addition to joining at the end of the material strap when using the foil bag. Fixing is rather appropriate and is designed to be released when the material strap is first used as a grip band. For the additional fixing described, in addition to the hot melt adhesive, for example, an adhesive tape between the outer side of the bag and the assigned material strap, an adhesive tape placed inwardly in an additional cavity, It is also possible to envisage a sealing that can be peeled off to a foil sheet piece arranged in the punched out part of the sheet, or a joining with a hot seal lacquer (Heisssiegellack) or a cold seal lacquer (Kaltsiegellack).

  Preferably, the hot-sealable material strap can be formed from a polyolefin such as, for example, polyethylene or polypropylene. In order to increase the load capacity of the material strap, this material strap can be formed by folding the foil strap on itself, with the vertical edges of the foil strap preferably fixed by hot sealing . In this case, the foil strap is bent so as to be arranged laterally or centrally in the material strap in which the vertical edges are formed. It may also be contemplated to form the material strap from a multi-layer foil in addition or as an alternative to increase strength and robustness. Thus, in order to form a material strap, in particular a foil with a sealable outer layer made of polyolefin, for example polyethylene, and a central layer made of polyamide can be envisaged.

  Within the framework of the method according to the invention, a band-shaped material can be supplied for the formation of a grip band, in which case the individual material straps are separated from the band-shaped material.

Foil bag partial view with cut expression Sectional view of the material strip provided for the manufacture of foil bags

  The invention will be described below on the basis of a drawing which is represented only as an example.

  FIG. 1 shows a foil bag 1 manufactured according to the invention. The foil bag includes two material straps 2 each folded into a U-shaped grip band, having a folded end 2a and a central portion 2b disposed therebetween. During the manufacture of the foil bag, the bag foil 3 is supplied and the opening 4 is provided by stamping. In this case, the distance between the four openings 4 arranged adjacent to each other corresponds to the length of the bag foil 3 supplied for forming one foil bag 1. Subsequently, a foil sheet piece (Foliezettel) 6 is placed for the cover of the opening 4 on the first surface 5 of the bag foil 3, which can be hot-sealed, and fixed by hot sealing. In the illustrated embodiment, one foil sheet piece 6 assigned to each opening 4 is supplied. However, alternatively, for example, two openings 4 can also be covered by one common foil sheet piece 6.

  Next, the bag foil 3 is formed on the material band 7 having a side bent portion with a sword portion and a shoulder portion. Subsequently, vertical seal joints 8a and 8b are provided by a sealing shoe (Siegelbacken). As can be seen from the cutaway view of FIG. 2, one of the longitudinal seal joints 8a is used for connecting the longitudinal ends of the bag foil 3, while the other 8b of the longitudinal seal joint is provided for reinforcement.

  In the foil bag 1 represented in FIG. 1, the bag foil 3 is formed from a multi-layer foil (Verbundfoil), and a layer made of polyolefin, for example polyethylene (PE), on the first surface 5 located inside, and Facing each other is an outer layer made of polyethylene terephthalate (PET). The PET layer is printed on the side facing the first layer 5. Between the first layer 5 and the outer layer, one or more intermediate layers, for example an adhesion promoting layer and a barrier layer, can be arranged. The window-like substantially rectangular opening 4 is covered with a foil sheet piece 6 inside the bag, and the foil sheet piece overlaps the opening 4 on the edge side. In the overlapping region, the foil sheet piece 6 is fixed to the first surface 5 of the bag foil 3 by a seal joint 9 which is itself closed and which surrounds the opening 4. The surface of the foil sheet piece 6 located on the first surface 5 of the bag foil 3 is also made of polyolefin, for example polyethylene (PE), which ensures a good sealing performance. The foil sheet piece 6 can be formed in a plurality of layers, and in particular has a barrier layer made of, for example, PET. The material strap can be made of polyethylene, for example, and is sealed to the foil sheet piece 6 along its sealed joint 9 that is stained and closed at its end 2a. Yes.

DESCRIPTION OF SYMBOLS 1 Foil bag 2 Material strap 2 a End part 2 b Center part 3 Bag foil 4 Opening part 5 First surface 6 Foil sheet piece
7 Material belt

Claims (10)

In a method of manufacturing a foil bag, in a method step for fixing a material strap (2) provided as a grip band,
A straight blank (2) is supplied unfolded, and then its end (2a) is folded,
The folded end (2a) of the material strap is placed on a material band (7) provided for the formation of the foil bag (1) by a swinging movement and is connected to this material band by frictional coupling. As well as
The swinging motion is performed around the swinging shaft extending outside the folded material strap (2), and the swinging shaft is moved from the flat standard to the material strip (7) with respect to the flat standard of the material strip (7). The method is characterized in that the rocking shaft is inclined obliquely so as to be inclined in the longitudinal direction and inclined by an inclination angle.   The folded material strap (2) is guided so that the pivot axis is essentially perpendicular to the plane stretched by the end (2a) and the central part (2b) connecting the ends (2a). The method according to claim 1, wherein: The bag foil (3) being guided,
An opening is formed in the bag foil (3), preferably by stamping,
At least one foil sheet piece (6) for covering the opening (4) is fixed to the first surface (5) of the bag foil (3),
The material as a foil tube so that by folding the bag foil (3), the foil sheet piece (6) is located inside the foil tube and is accessible through the assigned at least one opening (4) A band is formed,
The folded end (2a) of the material strap (2) is fixed to the at least one foil sheet piece (6) and thereby joined to the material strip (7) by frictional coupling; and
3. A method according to claim 1 or 2, characterized in that the foil bag (1) is separated from the blank (7).   4. The method according to claim 1, wherein the tilt angle is between 5 ° and 30 °, preferably between 10 ° and 20 °.   The bending of the material strap (2) is performed in the first period, and the placing of the bent material strap (2) on the material band (7) is performed in the second period of the swinging operation. The method according to claim 1, wherein the method is characterized in that   The method according to claim 5, wherein the rocking motion is performed periodically.   The material strap (2) is formed by folding the foil strap onto itself and the vertical edges of the foil strap are fixed by hot sealing. The method described in 1.   8. A method according to any one of the preceding claims, characterized in that the material strap (2) is fastened to the material strip (7) at its end (2a) by hot sealing.   The material strip (7) is periodically moved in the transport direction along its longitudinal direction, and the end (2a) of the material strap (2) faces the transport direction. The method according to any one of 1 to 8.   10. A method as claimed in claim 9, characterized in that the pivot axis is inclined in the conveying direction from the plane standard of the material strip (7).

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