Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
  • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B70/00—Making flexible containers, e.g. envelopes or bags
  • B31B70/60—Uniting opposed surfaces or edges; Taping
  • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
  • B31B70/626—Arrangements for permitting the glue to set
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2160/00—Shape of flexible containers
  • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
  • B31B2160/106—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents obtained from sheets cut from larger sheets or webs before finishing the bag forming operations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2160/00—Shape of flexible containers
  • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2170/00—Construction of flexible containers
  • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B70/00—Making flexible containers, e.g. envelopes or bags
  • B31B70/60—Uniting opposed surfaces or edges; Taping
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S493/00—Manufacturing container or tube from paper; or other manufacturing from a sheet or web
  • Y10S493/916—Pliable container
  • Y10S493/936—Square bottom

Definitions

• the invention relates to a method for producing floor bags with a glued inner bar.
• bottom bags for example block bottom or cross bottom bags made of paper, plastic film or the like
• the bottom flaps on the inside of the bag form undesirable cavities such as cracks or pockets in which powdery, granular or pasty remnants of the bag contents can become lodged.
• glue a so-called inner bar inside the bottom of the bag which is usually formed by a rectangular sheet made of the bag material and is glued or welded all around to the bottom flaps, so that the cavities are closed off from the inside of the bag .
• WO 95/02544 a method for producing such bags is known in which the bag material and the inner bar consist of paper coated on the inside with polyethylene. According to this method, the inner ledge is glued to the associated bottom flaps at the edges which run parallel to the narrow-side edges of the bottom, and parallel to the broad-sided edges of the bottom, the mutually facing coated surfaces of the inner bar and the bottom flaps are penetrated by outgoing welding lines welded together.
• gluing or welding in the inner bolt is generally relatively difficult and complex in terms of process technology, because there is no direct access to the inside of the floor for the tools required.
• the welds are therefore generally carried out on the flat floor, so that there are several layers of material in the floor between the welding tools. In general, therefore, it must be ensured by means of a suitable process control or by inserted separating sheets or the like that the welding is carried out only at the desired locations and that no material layers are welded to one another which are later separated again when the bag is filled Need to become.
• the usual method for the production of bottom bags is that the starting material is drawn off from a roll in the form of an endless web and then first closed to form a tube, which is then divided into suitable lengths to form the individual bags.
• the tube pieces thus obtained are continuously fed to a rotating floor laying drum, on which a pull-up station, a floor laying station and a closing station are arranged in succession in the circumferential direction.
• the pull-up station the upper and lower layers of the hose, which initially lie flat on top of each other, are pulled apart at the bottom end, so that a wide-open bottom opening is created.
• this inner latch must be inserted into the bottom opening between the pull-up station and the bottom laying station and then welded or glued to the bottom tabs.
• the construction of the device is considerably complicated by the gluing and / or welding devices required for this, and since the additional process steps such as applying the adhesive, producing the welding lines and the like take a certain amount of time, the overall processing time increases, so that only a correspondingly low bag output can be achieved in the continuous manufacturing process.
• This object is achieved in that a contact adhesive is used for the inner bar, which only then the desired adhesive strength Unfolded when two adhesive surfaces, both of which are coated with the contact adhesive, are pressed against one another such that the contact adhesive is applied to the starting material for the bag before this starting material is closed into a tube and fed to a floor laying station, and that the adhesive after applying the inner bar provided with contact adhesive is completed by exerting pressure on the flat floor.
• the method according to the invention thus has the advantage that the adhesive required for gluing in the inner bolt can be applied to the starting material for the bag before the hose is closed. Since the contact adhesive does not adhere as long as two surfaces coated with this contact adhesive are not pressed against one another, undesired adhesions can be avoided when the starting material is closed to form a tube and during subsequent processing.
• the contact adhesive can only become effective after the inner bar, which is provided with contact adhesive on the corresponding adhesive surfaces, is put on.
• the inner bars can also be coated with contact adhesive before they are fed to the floor laying drum, so that no additional time for applying the adhesive in hard-to-reach places is required directly on the floor laying drum and no corresponding time on the circumference of the floor laying drum Order facilities need to be provided.
• the is usually made from the Provide the starting material formed on each side with an inwardly drawn gusset.
• the transport means such as rollers or the like, which cause the hose or the hose pieces to be transported to the floor laying drum, to engage in the area of the side folds. Since the surfaces covered with contact adhesive are separated from one another by the side folds, the contact adhesive cannot be activated prematurely by the pressure exerted by the transport means.
• the transport means can also act on the regions of the hose or the hose pieces that are not separated by side folds.
• Figure 1 is a perspective view of the bottom portion of a bag with an internal bar immediately before the final glue.
• Figure 2 shows the arrangement of adhesive surfaces on a blank for the inner bar.
• FIG. 4 is a perspective view of the inner bar and the bottom area of the bag immediately before the inner bar is put on.
• FIG. 1 shows the bottom area of a block-bottom bag 10 which, for example, consists of paper and is coated on the inside with plastic (for example polyethylene).
• the bag has an upper wall 12 and a lower wall 14, which are connected to one another by side folds 16, and a bottom 18 with a rectangular plan, which in the state shown is still is not closed.
• the bottom 18 is formed by four bottom tabs formed in one piece with the main part of the bag, namely two trapezoidal tabs 20 projecting from the upper and lower walls of the bag and two rectangular tabs 22 extending the side gussets 16.
• the trapezoidal tabs 20 and the rectangular tabs 22 hang via triangular folds 24, which are folded back onto the trapezoidal flaps 20.
• the bottom has an inner bar 26 which is formed by a separate sheet of paper and is also coated on the inside with polyethylene.
• This inner bar 26 is glued at its longitudinal edges 28 to the inner surfaces of the rectangular flaps 22 and the triangular folds 24 and is also glued on its narrow sides to the surfaces of the trapezoidal flaps 20 pointing upwards in FIG.
• the trapezoidal flaps 20 are folded over one another in a known manner and glued to one another.
• FIG. 2 shows the blank, square in plan, for the inner bar 26.
• the surface of the blank visible in FIG. 2 is the inner surface, which is laminated with polyethylene and points downward in FIG. 1.
• the blank has side flaps 30 which are later folded backwards so that the corresponding fold lines form the longitudinal edges 28 of the inner bar.
• a glue or hot-melt adhesive in the form of adhesive lines 32 is applied to the flaps 30.
• the folded-over flaps 30 of the inner bolt are glued to the rectangular flaps 22 and the triangular wraps 24 in FIG. 1.
• two further adhesive lines 34 run parallel to the other two edges of the blank. These adhesive lines 34 are formed by contact adhesives and are used to glue the inner bolt to the trapezoidal flaps 20 and - in the area of the flaps 30 - to the triangular inserts 24.
• FIG. 3 shows the bottom area of a blank for the actual bag 10.
• the visible side of the cut corresponds to the laminated inside of the bag.
• the cut is divided into several fields by longitudinal fold lines 36 which, in the finished bag according to FIG. 1, form the upper wall 12, the lower wall 14 and the side folds 16. the.
• these fold lines 36 form a fin 38 and an adhesive flap 40 on the right edge of the blank in FIG. 3, which is provided with an adhesive line 42 made of glue or hot-melt adhesive.
• the fin 38 and the adhesive flap 40 are folded over in the opposite directions at the associated folding lines 36, and the adhesive flap is then glued to the left edge of the wall 14 in FIG. 3, so that the cut forms a so-called fin seam Hose is closed.
• the use of a fin seam has the advantage that the adhesive flap 40 with its polyethylene-coated side comes to rest on the likewise coated side of the wall 14, so that the bag is completely lined with polyethylene and the paper through which Moisture could penetrate due to the wicking, has no connection to the inside of the bag.
• the trapezoidal flaps 20 and the rectangular flaps 22 are separated from the main part of the bag by a transverse fold line 44.
• a further transverse fold line 46 is provided in the area of the upper wall 12 and the side folds 16, which allows the bottom 18 to be folded over into the plane of the upper and lower walls 12, 14 in the manner shown in FIG.
• this fold line 46 is only shown in broken lines because the material there is not folded in the state shown in FIG. 1.
• the longitudinal fold lines 36 in the area of the rectangular flaps 22 are also only shown in broken lines.
• the material is only temporarily folded when the hose is made, and the folds are undone later.
• Diagonal fold lines 48 separate the triangular folds 24 from the trapezoidal flaps 20 and also form further triangular folds in the area of the side folds 16, which allow the side folds to be connected to the rectangular bottom 18 in the manner shown in FIG.
• the trapezoidal flap 20 lying in the extension of the upper wall 12 and the adjacent triangular folds 24 are provided with a U-shaped adhesive line 50, which is formed by contact adhesive and forms the counterpart to one of the adhesive lines 34 of the inner bolt 26.
• the other trapezoidal flap 20 as well as the fin 38 and the adhesive flap 40 are provided with L-shaped adhesive lines 52, 54 made of contact adhesive, which together men form the counterpart to the other adhesive line 34 of the inner bar 26.
• the bag 10 is manufactured together with a plurality of similar bags in a continuous process in the following manner.
• the starting material which forms the blanks for the bags 10, is drawn off from a roll as an endless web.
• the outside of the web which is made of paper, can be printed with a lettering or other imprint.
• the adhesive lines 50, 52 and 54 consisting of contact adhesive can also already be printed on the web pulled off the roll, since the contact adhesive only adheres when it is pressed against a surface likewise coated with contact adhesive. In the web wrap, however, the contact adhesive only comes into contact with the non-adhesive paper side of the next web layer.
• the contact adhesive is printed in the desired pattern on the web pulled off the roll or applied in some other way and the web possibly passes through a drying station.
• the web then passes through a gluing station in which the hot melt adhesive line 42 is applied.
• the web is then folded along the fold lines 36 and glued to form a tube.
• the adhesive lines 50 and 52, 54 then come to lie directly on top of one another, but do not adhere to one another as long as no pressure is exerted on them.
• Transport rollers for the further transport of the hose engage in the vicinity of the longitudinal edges of the hose, where the mutually opposite sections of the adhesive lines 50 and 52, 54 are separated from one another by the side folds 16 lying between them. Consequently, these transport rollers do not cause the contact adhesive to adhere prematurely.
• the continuously transported tube is then cut into tube pieces in a punching or cutting device to form the individual bags, and the folding lines 44, 46, 48 are, if necessary, made with the help pre-grooved by pre-grooving tools.
• the tube pieces then run on a floor laying drum, as is usually used in the manufacture of floor bags.
• the pieces of hose are clamped one after the other onto the peripheral surface of the floor laying drum and run on the floor laying drum past a pull-up station, where the leading end of the hose on the bottom is pulled up.
• the rectangular flaps 22 and the trapezoidal flaps 20 then form, together with the triangular folds 24, an approximately box-shaped bottom opening, as shown in FIG. 4.
• the web material for the inner bars 26 is pulled off another roll, provided with the adhesive lines 34 made of contact adhesive and then dried if necessary and then cut to length.
• the flaps 30 are then folded over, and the folded flaps are provided with the adhesive lines 32 made of glue or hot-melt adhesive.
• a bag and an inner bar meet at a placement station arranged on the circumference of the bottom laying drum, and the inner bar 26 is inserted into the bottom opening of the bag in the manner shown in FIG.
• the ends of the inner bar 26 are bent up to form wings 56 so that they abut the inner surfaces of the trapezoidal plates 20. In this way, the adhesive lines 34 of the inner bar come to lie flush on the adhesive lines 50 and 52 of the bag.
• the bag then runs with the inserted inner bar into a floor-laying station, in which the trapezoidal straps 20 still erected in FIG. 4 are pulled apart, while the rectangular straps 22 and the triangular wrapping 24 are folded inwards. This results in the state shown in FIG. 1.
• the legs of the glue lines 52, 54 that form a U and run on these triangular folds come to rest partly on the base leg of this U and partly on the glue lines 34 on the folded flaps 30 of the inner bar 26.
• the rectangular tabs 22 lie on the flaps 30 of the inner bolt provided with hot-melt adhesive.
• the trapezoidal flaps 20 are then folded over and glued in a closing station. If necessary, the finished floor is then rolled on again with a pressure roller. Optionally, the rolling can also only take place at this stage, so that the rolling between the floor-laying station and the closing station can be omitted.
• normal glue is used for the glue lines 32 of the inner bar because these glue lines are only on the top of the inner bar in FIG. 3, so that the glue can be applied without problems, without the bottom flaps being smeared.
• contact adhesive 32 can also be used for these adhesive lines, which then interacts with corresponding adhesive lines on the rectangular flaps 22.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Making Paper Articles (AREA)
• Air Bags (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Related Child Applications (1)

Publications (2)

Family

ID=7764944

Family Applications (2)

Family Applications After (1)

Country Status (7)

Families Citing this family (18)

Family Cites Families (19)

• 1995
  • 1995-06-22 DE DE19522619A patent/DE19522619C2/de not_active Expired - Fee Related
• 1996
  • 1996-04-11 DE DE59608620T patent/DE59608620D1/de not_active Expired - Fee Related
  • 1996-04-11 AT AT96912009T patent/ATE194796T1/de not_active IP Right Cessation
  • 1996-04-11 EP EP96912009A patent/EP0833744B1/fr not_active Expired - Lifetime
  • 1996-04-11 JP JP9503533A patent/JPH11507884A/ja active Pending
  • 1996-04-11 WO PCT/EP1996/001540 patent/WO1997000768A1/fr active IP Right Grant
  • 1996-04-11 DE DE59605625T patent/DE59605625D1/de not_active Expired - Lifetime
  • 1996-04-11 AT AT99101375T patent/ATE211682T1/de not_active IP Right Cessation
  • 1996-04-11 EP EP99101375A patent/EP0914939B1/fr not_active Expired - Lifetime
  • 1996-04-11 US US08/981,342 patent/US5913764A/en not_active Expired - Fee Related
  • 1996-04-11 ES ES96912009T patent/ES2148752T3/es not_active Expired - Lifetime
  • 1996-04-11 ES ES99101375T patent/ES2170549T3/es not_active Expired - Lifetime

Non-Patent Citations (1)

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