Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42C—BOOKBINDING
  • B42C7/00—Manufacturing bookbinding cases or covers of books or loose-leaf binders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42C—BOOKBINDING
  • B42C9/00—Applying glue or adhesive peculiar to bookbinding
  • B42C9/0056—Applying glue or adhesive peculiar to bookbinding applying tape or covers precoated with adhesive to a stack of sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D3/00—Book covers
  • B42D3/002—Covers or strips provided with adhesive for binding
• • 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
  • Y10S493/947—File folder

Definitions

• the present invention relates to a method and an apparatus for producing folders of the kind comprising two cover sheets, a spine, which is connected with the cover sheets by means of creasing lines, and a binding agent, which is applied to the inside of the spine and which is activable to connect sheets inserted between the cover sheets to the spine.
• Folders of this kind have been widely used, especially folders using hot-melt glue as the binding agent.
• the folder with contents is placed in a so called binding machine, in which the hot-melt glue is heated such that the stack of sheets will sink into the glue. After cooling, the stack of sheets is connected with the spine of the folder.
• a common method is attaching a solid strip of glue to a flat folder blank, which will then be folded along creasing lines on either side of the strip of glue to define a finished folder. Attachment of the strip of glue and forming of the creasing lines may be carried out, for example, in the way disclosed in the Swedish patent appli ⁇ cation as published for opposition 413 647, and the sub- sequent folding may take place, for example, in the way described in the Swedish patent application as published for opposition 431 975.
• Another known method comprises the steps of forming creasing lines on a flat folder blank, or on a web of material, from which folder blanks will then be separated, and immediately thereafter spraying hot-melt glue between said creasing lines.
• a method like this is disclosed, for example, in the German Offenlegungsschrift 2 611 242.
• the major disadvantages of the latter method is that the folder blank must be folded in a subsequent folding operation, that the strip of glue will be uneven and will partly cover the creasing lines, and that the side edges of the strip of glue will not adhere to the cover sheets of the finished folder.
• Another solution evident from the US patent speci ⁇ fication 4 129 471, comprises the spraying of melted glue onto a flat folder blank, whereupon the blank is folded in order to define two cover sheets and a spine. Folding is carried out along lines located in the glue area.
• the major disadvantages of this solution is that folding is difficult to carry out and that the folding edges will be irregular and unsharp.
• Fig. 1 is a perspective view showing a folder made by means of the method and the apparatus according to the present invention
• Fig. 2 is a diagrammatical side view, partly in section, of an apparatus for manufacturing folders according to Fig. 1 ;
• Fig. 3 is a view of the apparatus according to Fig.
• Figs. 4 - 9 are cross-sectional views of stations being part of the apparatus according to Figs. 2 and 3.
• Fig. 1 shows a finished folder 1 made in accordance with the invention, which folder consists of two cover sheets 2 and 3, a spine 4 and a strip of glue 5.
• the cover sheets 2 and 3 are shown in Fig. 1 as parts of a single folder blank of cardboard or plastic but may consist of, for example, a front cover sheet of transparent plastic, which near the spine 4 is attached to a flap of the remaining part of the folder made of cardboard.
• Creasing lines 6 and 7 are formed in the area between the spine 4 and the cover sheets 2 and 3.
• Creasing lines 8 and 9 are also formed in the cover sheets 2 and 3 at a short distance from the spine 4.
• the strip of glue 5, consisting of a thermoplastic so called hot-melt glue, is attached to the spine as well as to those portions of the cover sheets 2 and 3 which are located between the creasing lines 6 and 8, and 7 and 9, respec ⁇ tively.
• the folder 1 is used as a cover for a stack of paper sheets to be connected to the spine 4 of the folder via the strip of glue 5.
• the way in which this prebinding, so called binding, is carried out does not form part of the present invention and will therefore not be described. However, for understanding of the way binding is carried out, reference is made to the US patent specification 4 678 386.
• Figs. 2 and 3 show a conveyor 10, both upper parts 10a and 10b of which are moved step by step to the right in the figures.
• the speed of the conveyor 10 and the times for starting and stopping the same are synchronized with the various operations carried out at stations A - F.
• a web of material 12 wound on a reel 11 is the starting material in the production of folders 1 at the stations A - F.
• Each folder blank 13 delivered from the station A is transferred to the conveyor 10 where it is held by non-illustrated means whilst being transported during the entire production procedure.
• the creasing lines 6 - 9 are formed in the folder blank 13 by creasing means including a fixed die 15 with elongated recesses 15a and an upwardly-downwardly movable punch 16 with elongated projections 16a, which are partly pressed into the recesses 15a, thereby forming the creasing lines.
• the die 17 is provided with an elongated recess 17a, the width of which slightly exceeds the distance between the creasing lines 6 and 7, and the height of which slightly exceeds the distance between the creasing lines 6 and 8, and 7 and 9, respectively.
• the side walls of the recess 17a are preferably parallel but may deviate somewhat from this orientation.
• the folder blank 13 will keep this shape by the die 17 also extending into the station D and by an abutment 19, which presses the cover sheets 2 and 3 in the direction of the die 17, extending from the end of the station C up to and including the end of the station D.
• liquid hot-melt glue is sprayed into the U- shaped channel of the folder blank 13 by means of a nozzle 20, the lower end of which is inserted into the channel and is situated at a short distance from the spine of the folder blank.
• Injection of glue is suitably carried out from a fixed nozzle while the folder blank 13 is transported by the conveyor but, alternatively, may be carried out with the folder blank standing still at the station D while the nozzle is displaced in the longitudinal direction of the conveyor 10.
• the strip of glue deposited on the folder blank will be cooled, for example, by a fan 21 blowing cooling air into the U-shaped channel of the folder blank. Cooling may take place when the conveyor 10 is moving or when it is standing still.
• the glue in said channel will have solidified and adhered to the spine of the folder blank as well as to the areas of the cover sheets 2 and 3 which are located next to the spine.
• the finished folder 1 will finally be removed from the conveyor 10 in some suitable, non-illustrated way.
• station B may be omitted, and creasing may be carried out by means of the punch 18 at the station C while the punch is carrying out the folding.
• the abutment 19 may be omitted and an elongated nozzle for application of the glue may be inserted between essentially parallel or slightly diverging cover sheets 2, 3. If the cover sheets 2, 3 are further kept in these positions, cooling of the strip of glue will be less effective but, on the other hand, the jaws 22, 23 will pro ⁇ bably not be required.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Sheet Holders (AREA)
• Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
• Making Paper Articles (AREA)

Priority Applications (6)

Applications Claiming Priority (1)

Related Child Applications (1)

Publications (1)

Family

ID=20382148

Family Applications (1)

Country Status (7)

Cited By (3)

Families Citing this family (6)

Citations (5)

Family Cites Families (9)

• 1991
  • 1991-03-12 SE SE9100750A patent/SE469714B/sv not_active IP Right Cessation
• 1992
  • 1992-09-08 JP JP6507096A patent/JPH08501034A/ja active Pending
  • 1992-09-08 DE DE69223812T patent/DE69223812T2/de not_active Expired - Fee Related
  • 1992-09-08 AU AU27795/92A patent/AU2779592A/en not_active Abandoned
  • 1992-09-08 WO PCT/SE1992/000618 patent/WO1994005508A1/en active IP Right Grant
  • 1992-09-08 EP EP92921863A patent/EP0660781B1/en not_active Expired - Lifetime
• 1997
  • 1997-04-29 US US08/840,420 patent/US6186935B1/en not_active Expired - Fee Related

Patent Citations (5)

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