EP0902746A1 - Spirale destinee a la reliure de feuilles - Google Patents

Spirale destinee a la reliure de feuilles

Info

Publication number
EP0902746A1
EP0902746A1 EP98922601A EP98922601A EP0902746A1 EP 0902746 A1 EP0902746 A1 EP 0902746A1 EP 98922601 A EP98922601 A EP 98922601A EP 98922601 A EP98922601 A EP 98922601A EP 0902746 A1 EP0902746 A1 EP 0902746A1
Authority
EP
European Patent Office
Prior art keywords
polypropylene
binding
fingers
injection molding
mixture
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.)
Withdrawn
Application number
EP98922601A
Other languages
German (de)
English (en)
Inventor
Friedrich Von Rohrscheidt
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0902746A1 publication Critical patent/EP0902746A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42B—PERMANENTLY ATTACHING TOGETHER SHEETS, QUIRES OR SIGNATURES OR PERMANENTLY ATTACHING OBJECTS THERETO
    • B42B5/00—Permanently attaching together sheets, quires or signatures otherwise than by stitching
    • B42B5/08—Permanently attaching together sheets, quires or signatures otherwise than by stitching by finger, claw or ring-like elements passing through the sheets, quires or signatures
    • B42B5/10—Permanently attaching together sheets, quires or signatures otherwise than by stitching by finger, claw or ring-like elements passing through the sheets, quires or signatures the elements being of castellated or comb-like form

Definitions

  • the invention relates to binding spines for binding sheets.
  • Such spines are known for example from EP-A-0 704 322. They are injection molded from plastic. Any sprayable or thermally deformable plastic material which is elastic in the hardened state can be used as the plastic.
  • Polythene is preferably used as a binder.
  • the starting material for the plastic is plastic granulate.
  • Another known method is to punch out binding spines from plastic film made of polyvinyl chloride (PVC), and then to heat the punched out film and roll it into a cylindrical shape. This creates a lot of punched out material as waste.
  • PVC also poses environmental problems in the form of toxic gases.
  • the present invention proposes polypropylene (PP) as a particularly advantageous material for the production of binding spines by injection molding.
  • Polypropylene is cheaper, lighter in weight and easier to spray than polyvinyl chloride (PVC), which was previously only used for punching and rolling processes.
  • PVC polyvinyl chloride
  • PVC would develop toxic and corrosive vapors during the spraying process.
  • PP usually only has about half the modulus of elasticity of PVC: PVC usually 3000 - 3500 N / mm 2 PP usually 1500 - 1900 N / mm 2
  • the unsatisfactory impact strength of binding spines made of high-strength PP homopolymer becomes apparent when documents that are bound with such binding spines run through postmark machines and thereby break the binding spines under the postmark.
  • the invention has determined in long series of tests that mixtures of high-strength PP homopolymer and PP block copolymer with mixing ratios of about 80/20 to 20/80, preferably about 50/50, are ideally suited for the production of sprayed binding ridges. Bindings that consist only of PP block copolymer have shown insufficient strength.
  • the object of the invention is to produce stable, thin-walled binding spines made of plastic in an injection molding process faster and cheaper than with Polyethylene is possible without having the disadvantages of polyvinyl chloride (PVC).
  • PVC polyvinyl chloride
  • FIG. 1 shows a binding spine according to the invention, with which sheets of paper or another material are bound
  • FIG. 1 is an end view from above of the spine of FIG. 1,
  • FIG. 3 is a broken rear view from the left on the binding spine of FIG. 1.
  • the binding spine 2 according to the invention shown in FIGS. 1, 2 and 3 was produced in one piece from plastic by injection molding.
  • the plastic consists of at least two types of polypropylene mixed with one another before injection molding Mixing ratio between about 80/20 to 50/50.
  • the plastic mixture preferably consists of high-strength polypropylene homopolymer and polypropylene block copolymer in a mixing ratio in the range from about 80/20 to about 20/80, preferably in the range from about 50/50.
  • the binding spine 2 consists in one piece of a back part 4 and fingers 6 extending towards it in a loop shape on one side.
  • the fingers 6 extend through holes 8 in sheets 10 to close to the other side of the binding spine.
  • the fingertips 12 can overlap the back part 4.
  • the fingertips 12 do not overlap the back part 4, as shown in the drawings, because then the injection molding tool can be made simpler, in particular a mandrel of the
  • Injection molding tool can be pulled out of the interior in the longitudinal direction of the binding spine, which is delimited by the back part 4 and the fingers 6.
  • the back part 4 and its fingers 6 can, seen in cross section, form a circular or oval or polygonal ring.
  • the back part 4 can be designed with or without lateral projections 14 which protrude between the fingertips 12 opposite to the fingers.
  • more than two different types of polypropylene can be mixed together. The mixing is preferably carried out by mixing granules of the different types with one another before they are formed into a binding spine by the injection molding process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne une spirale destinée à la reliure de feuilles. La spirale est réalisée par moulage par injection d'un mélange composé au moins de deux sortes de polypropylène aux fluidités identiques ou très proches. Pour le moulage par injection des spirales, on utilise de préférence un mélange d'homopolymère de polypropylène et d'un copolymère de polypropylène séquencé dans un rapport compris entre 80/20 et 20/80 et, de préférence, de 50/50.
EP98922601A 1997-03-26 1998-03-12 Spirale destinee a la reliure de feuilles Withdrawn EP0902746A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19712597 1997-03-26
DE1997112597 DE19712597A1 (de) 1997-03-26 1997-03-26 Binderücken zum Binden von Blättern
PCT/DE1998/000755 WO1998042520A1 (fr) 1997-03-26 1998-03-12 Spirale destinee a la reliure de feuilles

Publications (1)

Publication Number Publication Date
EP0902746A1 true EP0902746A1 (fr) 1999-03-24

Family

ID=7824615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98922601A Withdrawn EP0902746A1 (fr) 1997-03-26 1998-03-12 Spirale destinee a la reliure de feuilles

Country Status (3)

Country Link
EP (1) EP0902746A1 (fr)
DE (1) DE19712597A1 (fr)
WO (1) WO1998042520A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1710728U (de) * 1955-09-05 1955-11-10 Bohm & Co Kammrolle fuer plastikbindungen.
GB2193466A (en) * 1986-08-08 1988-02-10 Chen Wei Men Binding device for holding papers
DE8622425U1 (de) * 1986-08-21 1986-10-16 Chen, Wei-Men, Taipeh/T'ai-pei Bindevorrichtung zum Halten von Lose-Blatt-Papieren
DE19502383A1 (de) * 1995-01-26 1996-08-01 Friedrich Von Rohrscheidt Binderücken

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9842520A1 *

Also Published As

Publication number Publication date
DE19712597A1 (de) 1998-10-01
WO1998042520A1 (fr) 1998-10-01

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