EP0775634A1 - Formschulter für eine Vorrichtung zum Herstellen von Beuteln und Verfahren zu deren Herstellung. - Google Patents

Formschulter für eine Vorrichtung zum Herstellen von Beuteln und Verfahren zu deren Herstellung. Download PDF

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Publication number
EP0775634A1
EP0775634A1 EP95308427A EP95308427A EP0775634A1 EP 0775634 A1 EP0775634 A1 EP 0775634A1 EP 95308427 A EP95308427 A EP 95308427A EP 95308427 A EP95308427 A EP 95308427A EP 0775634 A1 EP0775634 A1 EP 0775634A1
Authority
EP
European Patent Office
Prior art keywords
connecting line
former
axial direction
tubular
shoulder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95308427A
Other languages
English (en)
French (fr)
Other versions
EP0775634B1 (de
Inventor
Masao c/o Ishida Co. Ltd. Fukuda
Keiichi Nishimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ishida Co Ltd
Original Assignee
Ishida Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ishida Co Ltd filed Critical Ishida Co Ltd
Priority to DE1995610204 priority Critical patent/DE69510204T2/de
Priority to EP19950308427 priority patent/EP0775634B1/de
Publication of EP0775634A1 publication Critical patent/EP0775634A1/de
Application granted granted Critical
Publication of EP0775634B1 publication Critical patent/EP0775634B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2014—Tube advancing means
    • B65B9/2021—Tube advancing means combined with longitudinal welding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/12—Feeding webs from rolls
    • B65B41/16—Feeding webs from rolls by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2014—Tube advancing means
    • B65B9/2028—Rollers or belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/22—Forming shoulders; Tube formers

Definitions

  • This invention relates to a former for a bag maker and a method of producing such a former. This invention also relates to packaging machines incorporating such a former.
  • a bag maker-packaging machine such as a vertical pillow-type form-fill-seal packaging machine as disclosed, for example, in U.S. Patent 5,237,798 issued August 24, 1993, makes use of a component commonly known as a former for bending an elongated flexible bag-making material into a cylindrical form, generally composed of a vertically extending tubular part and a so-called shoulder part (sometimes also called a skirt-like part) having a sloped planar guide section.
  • the bag-making material say, in the form of a web, is longitudinally transported towards the former horizontally in a flat form, moves over and along this sloped planar guide section of the shoulder part, changes the direction of its motion sharply as it crosses the connecting line at which the tubular and shoulder parts are attached together so as to move inside the tubular part and is pulled downward axially along the inner surface of the tubular part.
  • the bag-making material is pushed upwards first over the sloped planar guide section of the shoulder part, changes the direction of its motion sharply at the connecting line as it is folded into a tubular form, and then is pulled downward by the force not only of the articles which are dropped in to be packaged in the bag being made but also of a pull-down belt or the like (not shown) for causing the motion of the bag-making material.
  • the connecting line, at which the bag-making material is forced to change the direction of its motion sharply be a continuous smooth curve shaped correctly because, if it is not shaped correctly or has even a small unevenness, the material is likely to become wrinkled or develop small longitudinal lines on the surface.
  • Formers of this type are usually produced by casting, a master mold being used thereafter to carry out an accurate copy process for shaping the connecting line correctly. This, however, requires a long time of hard work by an experienced worker, adding to the production cost, and fluctuations and non-uniformity in the shape of formers make them non-exchangeable. Moreover, many formers are usually required for producing bags of different sizes. Even when bags of the same size are produced, different formers are generally required, depending upon where and how the side edges of the elongated bag-making material should be overlapped for longitudinal sealing. The angle of the sloped planar guide section of the shoulder part must be changed, furthermore, depending on the physical properties of the bag-making material such as its thickness. In short, the cost of equipping a bag maker with a sufficient number of formers with different kinds is substantial if prior art technology is relied upon.
  • a former for forming an elongated planar bag-making material into a tubular form comprises a hollow cylindrical tubular part having an inner surface and defining an axial direction; and a shoulder part which has a planar guide section and is connected to said tubular part along a connecting line which surrounds said tubular part such that said material is transported over said planar guide section of said shoulder part, changes direction of motion sharply at said connecting line into said axial direction and is transformed into a tubular form along said inner surface of said tubular part, the angle between the tangent and said connecting line and a plane perpendicular to said axial direction changing at a constant rate.
  • This invention provides a method of producing formers of different kinds accurately and automatically.
  • This invention also provides formers produced by such a method, having their tubular and shoulder parts formed by bending pieces which are cut from a blank sheet by a numerically controlled cutting machine.
  • a former according to the present invention may be characterized not only as being composed of a hollow cylindrical tubular part defining an axial direction and a shoulder part which has a planar guide section and is attached to the tubular part along a closed three-dimensional line (referred to as the connecting line) such that an elongated bag-making material transported over the sloped planar guide section of the shoulder part can be made into a tubular form as it crosses the connecting line to move into the tubular part, but wherein the aforementioned connecting line between the tubular and shoulder parts is shaped such that the angle between its tangent and a plane perpendicular to the axial direction of the tubular part changes at a constant rate with respect to the change in position of the contact point of the tangent with the connecting line, for example, in the direction perpendicular to the axial direction of the tubular part or along the connecting line itself.
  • pieces to be made into the tubular and shoulder parts are cut out from a blank sheet in specified geometrical shapes, bent and folded appropriately into predetermined shapes of the tubular and shoulder parts, and attached together, say, by welding, along the aforementioned connecting line.
  • the geometrical shapes into which the blank sheet is cut are determined such that, when these pieces are bent, folded and attached together as described above, the connecting line therebetween will satisfy the condition imposed according to this invention as described above regarding the rate of change in its slope.
  • side strips of different widths may be provided along the side edges of the pieces to be cut out from the blank sheet.
  • Fig. 1 shows at 10 an example of formers according to the present invention, comprised essentially, like a prior art former, of a hopper 15, a tubular part 20 and a shoulder part 30 which are attached to each other.
  • the three-dimensionally curved closed line along which the tubular part 20 and the shoulder part 30 will be referred to as a connecting line 40 (and also indicated by letter Q).
  • a blank sheet material is cut into specified geometrical shapes as shown in Figs. 2A and 2B, bending them and attaching them together.
  • the pieces of a blank sheet thus cut out are herein referred to as the tube-forming piece 52 and the shoulder-making piece 53, respectively.
  • Fig. 3A shows how the tube-forming piece shown in Fig. 2B may be bent into a tubular form to form the tubular part 20.
  • both the tube-forming and shoulder-forming pieces 52 and 53 have a curved edge section 54.
  • their curved edge sections 54 become the connecting line 40, along which the tubular and shoulder parts 20 and 30 are attached together.
  • the desired shape of the connecting line 40, and the problem of how to determine the shape of the curved edge section 54 when the tube-forming and shoulder-forming pieces 52 and 53 are cut out, will be discussed next.
  • the tubular part 20 is of the shape of a cylinder which has been cut by a sloped plane, as shown both in Figs. 1 and 3A.
  • the tubular part 20 is standing up vertically, or that it has a vertical axial direction, as shown in Fig. 3A with the highest and lowest points on the connecting line Q indicated by letters O and A, respectively.
  • a three-dimensional rectilinear coordinate system with mutually perpendicular ⁇ , ⁇ and ⁇ -axes is defined, as shown in Fig. 3A, with the origin at O, the ⁇ -axis extending vertically downward, the lowest point A of the connecting line Q being on the ⁇ -plane.
  • the ⁇ -plane will be also referred to as the horizontal plane, and the projection of the cylindrical form of the tubular part 20 onto the horizontal plane will be referred to as the cross-section curve.
  • Cross-section curves which are symmetric with respect to the ⁇ -axis, such as a circle, and connecting lines which are symmetric with respect to the ⁇ -plane will be considered throughout herein, although this is not intended to limit the scope of the invention.
  • Fig. 4 shows the shape of the curved edge section 54, that is, the portion of the tube-forming piece 52 which, when bent, will form the connecting line Q.
  • Fig. 4 shows the curve which will be obtained, corresponding to the connecting line Q, if the tubular part 20 shown in Fig. 3A is unbent and flattened.
  • This two-dimensional curve, representing the aforementioned curved edge sections 54 will be hereinafter referred to as the edge curve, and a two-dimensional rectilinear coordinate system with mutually perpendicular x and z-axes is defined, for convenience as shown in Fig. 4, with the z-axis coinciding with the ⁇ -axis and the origin O at the same position as shown in Fig. 3A.
  • the goal of this invention is to properly design the edge curve such that a bag-making material (as indicated by letter f in Fig. 1) will smoothly change the direction of its motion as it is pulled across the connecting line Q.
  • the edge curve in Fig. 4 should be a smoothly bending curve. This condition alone, however, is not sufficient to determine the shape of the curve.
  • the connecting line Q is required to change its slope uniformly. Stated more precisely, the angle between the tangent to the connecting line Q and the horizontal plane is required to change at a constant rate.
  • the aforementioned constant rate is with respect to the x-coordinate of the contact point at which the connecting line Q and its tangent contact each other.
  • slope of the tangent of the connecting line Q must change at a constant rate with respect the perpendicular component of change in position of the contact point between the connecting line Q and its tangent with respect to the axial direction of the tubular part 20.
  • P an arbitrary point on the connecting line Q
  • the slope as defined above at point P is the tangent of angle ⁇ indicated in Fig. 4.
  • tan -1 (2Hr/B 2 ) tan -1 (2H/ ⁇ 2 r).
  • the portion of the shoulder part 30 corresponding to the connecting line Q is shaped identically. It must be so since each part of the bag-making material f must travel the same distance before and after it is transformed into a tubular shape.
  • the shoulder part 30 has a sloped planar guide section 33 over which the bag-making material f is caused to slide upward before the direction of its motion is suddenly changed downward when it reaches the connecting line 40.
  • the angle of this planar guide section 33 with the horizontal direction is denoted by ⁇ in Fig. 5.
  • Fig. 5 also shows the projection of the connecting line Q onto the ⁇ -plane.
  • Fig. 6A shows a standard fin seal whereby the inner surfaces of both side edges of the material are stuck together and the two side edges are then folded in one direction.
  • Fig. 6B shows a lap seal, which is also sometimes called an envelope seal, whereby the inner surface of one side edge is stuck to the outer surface of the other edge.
  • Fig. 6A shows a standard fin seal whereby the inner surfaces of both side edges of the material are stuck together and the two side edges are then folded in one direction.
  • Fig. 6B shows a lap seal, which is also sometimes called an envelope seal, whereby the inner surface of one side edge is stuck to the outer surface of the other edge.
  • envelope seal which is also sometimes called an envelope seal
  • FIG. 6C shows a kind of offset seal whereby the overlapped edges are folded in one direction such that either the fold line or the outer edges will be at the center in the direction of the width of the bag. In this case, too, both the positions and the widths of the areas for making the joint change, depending upon the kind of the seal.
  • Fig. 6D shows still another seal whereby the edges are folded in the reverse direction after a fin seal has been made.
  • the tube-forming piece is bent to form the tubular part, its side edge parts are either overlapped as shown in Fig. 3A or made to form a flat part 34 as shown in Fig. 3B such that a pair of mutually opposite vertical sealers (not shown) can be used to form a fin seal.
  • the width W of the narrow strip for making an overlap should be determined, depending upon what kind of sealing is intended when bags are formed at a later stage after the bag-making material f is bent into a tubular form by the former.
  • the shape as shown in Figs. 2A and 2B, in which the blank sheet should be cut is determined.
  • a CAD/CAM system may be used to create a numerical control program automatically on the basis of such determinations as well as physical properties of the blank sheet such as its thickness.
  • a numerically controlled laser cutter is operated by such a program to cut a blank sheet as shown in Figs. 2A and 2B in single strokes and obtain pieces to be bent to make the tubular and shoulder parts. These parts are positioned next to each other along their connecting lines and welded together to build a former as shown in Fig. 1.
  • the cross-sectional shape of the tubular part it is not required to be circular.
  • a somewhat elongated circular shape may be preferred such as a shape comprised of two semi-circles connected with two straight side lines or an elliptical cross-sectional shape. Since the condition imposed upon the shape of the connecting line according to this invention does not depend upon the cross-sectional shape of the tubular part, the present invention, as described above, is applicable to tubular parts with different cross-sectional shapes.
  • Fig. 7 shows a vertical pillow type form-fill-seal packaging machine 90 as an example of packaging machines which may incorporate a former according to this invention.
  • the flexible thermoplastic bag-making material f (or a film) is originally in the form of a web roll 92 supported around a shaft 95 (serving as web supporting means).
  • the film f, pulled out of the web roll 92, is guided by a plurality of guide rolls (including dancer rollers) 105 to the former 10 as described above with reference to Fig. 1.
  • the film f After the film f is thereby formed into a tubular shape, by sliding on the shoulder part 30 and changing the direction of its motion at its connecting line 40 with the tubular part 30, it is pulled downward by a film-pulling unit 100 including a pair of pull-down belts 101 which run parallel to each other and a longitudinal sealer in the form of a heater belt 102 for sealing together the mutually overlapping edge portions of the film f.
  • the film f which is now in a cylindrical form, is sealed horizontally (that is, transversely to its downward direction of motion) by a transverse sealer 110, as articles to be packaged are dropped from the hopper 15.
  • the transverse sealer 110 may be of a design provided with a fixed seal jaw 112 and a mobile seal jaw 114 both of a known structure and disposed below the film-pulling unit 100.
  • numeral 113 indicates a blade for cutting the film f transversely between the bags into which the film f has been formed.
  • formers according to this invention can be incorporated in many other kinds of packaging machines and bag makers where it is required to bend a longitudinally traveling flexible bag-making material into a tubular form.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Making Paper Articles (AREA)
EP19950308427 1995-11-23 1995-11-23 Formschulter für eine Vorrichtung zum Herstellen von Beuteln und Verfahren zu deren Herstellung. Expired - Lifetime EP0775634B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1995610204 DE69510204T2 (de) 1995-11-23 1995-11-23 Formschulter für eine Vorrichtung zum Herstellen von Beuteln und Verfahren zu deren Herstellung.
EP19950308427 EP0775634B1 (de) 1995-11-23 1995-11-23 Formschulter für eine Vorrichtung zum Herstellen von Beuteln und Verfahren zu deren Herstellung.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950308427 EP0775634B1 (de) 1995-11-23 1995-11-23 Formschulter für eine Vorrichtung zum Herstellen von Beuteln und Verfahren zu deren Herstellung.

Publications (2)

Publication Number Publication Date
EP0775634A1 true EP0775634A1 (de) 1997-05-28
EP0775634B1 EP0775634B1 (de) 1999-06-09

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EP19950308427 Expired - Lifetime EP0775634B1 (de) 1995-11-23 1995-11-23 Formschulter für eine Vorrichtung zum Herstellen von Beuteln und Verfahren zu deren Herstellung.

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EP (1) EP0775634B1 (de)
DE (1) DE69510204T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7214173B2 (en) * 2000-10-30 2007-05-08 Pactiv Corporation Laser for forming bags from a web of material
CN110683139A (zh) * 2019-10-11 2020-01-14 广州三木汽车部件有限公司 一种汽车内饰件包装机
JP2020023361A (ja) * 2013-11-19 2020-02-13 ティエヌエイ オーストラリア ピーティワイ リミテッド フィルム駆動アセンブリ、フォーマショルダ、及びフォーマショルダベースプレートの組み合わせ体

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7367931B2 (en) 2000-10-30 2008-05-06 Pactiv Corporation Laser cutoff stacker assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB913114A (en) * 1959-07-27 1962-12-19 William Clair Leasure Packaging methods and apparatus
US3494265A (en) * 1968-02-01 1970-02-10 Woodman Co Package former with multiple elliptical curve
US3636826A (en) * 1969-10-24 1972-01-25 Burlie R Bowen Folding shoe for use in a packaging machine
US4918611A (en) * 1988-07-21 1990-04-17 Industrial Technology Research Institute Method and apparatus for controlling laser cutting by image processing
DE4038888A1 (de) * 1990-12-06 1992-06-11 Rovema Gmbh Verfahren zur herstellung einer formschulter bei schlauchbeutelmaschinen
US5237798A (en) 1991-07-12 1993-08-24 Ishida Scales Mfg. Co., Ltd. Packaging machine with improved film-transporting device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB913114A (en) * 1959-07-27 1962-12-19 William Clair Leasure Packaging methods and apparatus
US3494265A (en) * 1968-02-01 1970-02-10 Woodman Co Package former with multiple elliptical curve
US3636826A (en) * 1969-10-24 1972-01-25 Burlie R Bowen Folding shoe for use in a packaging machine
US4918611A (en) * 1988-07-21 1990-04-17 Industrial Technology Research Institute Method and apparatus for controlling laser cutting by image processing
DE4038888A1 (de) * 1990-12-06 1992-06-11 Rovema Gmbh Verfahren zur herstellung einer formschulter bei schlauchbeutelmaschinen
US5237798A (en) 1991-07-12 1993-08-24 Ishida Scales Mfg. Co., Ltd. Packaging machine with improved film-transporting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7214173B2 (en) * 2000-10-30 2007-05-08 Pactiv Corporation Laser for forming bags from a web of material
JP2020023361A (ja) * 2013-11-19 2020-02-13 ティエヌエイ オーストラリア ピーティワイ リミテッド フィルム駆動アセンブリ、フォーマショルダ、及びフォーマショルダベースプレートの組み合わせ体
CN110683139A (zh) * 2019-10-11 2020-01-14 广州三木汽车部件有限公司 一种汽车内饰件包装机

Also Published As

Publication number Publication date
DE69510204D1 (de) 1999-07-15
DE69510204T2 (de) 1999-11-11
EP0775634B1 (de) 1999-06-09

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