FR2649644A1 - ASSEMBLY OF A BLOCK OF PVC SHEETS BY WELDING INSIDE A COVER WITH OUTSIDE NOT A PVC SHEET - Google Patents

Abstract

The invention relates to a method for high-frequency binding of a book made up of PVC sheets and a cover the exterior of which is not made of PVC, as well as the book obtained by implementing said process. The process consists in sticking a PVC sheet 5 inside the cover, in placing the stacked PVC sheets 1 on the cover 2 and in high-frequency welding the sheets 1 and the cover at the level of a line of fold 7 by applying high-frequency welding means 6 on either side of this fold line 7. The invention is particularly suited to the production of photo albums or document protectors.

Description

The invention relates to a process for high frequency binding of a

  PVC sheet and a cover with a non-PVC exterior

  the work obtained by implementing said method.

  The invention relates more particularly to a method of high frequency binding of a book whose PVC sheets are pouches such as a photo album. or one

protects documents.

  The conventional methods used to connect books made of plastic sheets such as photo-album or document protectors are thermal welding, ultrasound welding and soldering.

high frequency.

  Thermal welding has a certain number of drawbacks, the main one being the limitation in thickness of the welded material. In addition, the weld obtained may have an appearance that does not favor the marketing of the product. (burr, overflow ...). Ultrasonic welding has the disadvantage of being able to be used only in connection with the joining of materials of the same nature. Ultrasonic welding can also have a poor quality finish, especially when used

  to achieve a weld of too great thickness.

  The most suitable technique that best meets the quality requirements of binding is high frequency welding. This technique consists of passing a high frequency electric current through the plastic material, thus allowing the melting of this plastic material. This technique can therefore be used only in the context of the production of sheets solder made of a relatively conductive plastic material. On the other hand, the high-frequency technique is unusable with many materials such as polyethylene, polypropylene, polyester and, in general, not all plastics have enough mobile electrons on their chain. for

allow the passage of the current.

  However, high-frequency welding has the disadvantage that it can only be used in

  assembling materials of the same kind.

  In the context of the production of books made of plastic sheets and a cover, such as for example an albumphotos, the use of a method of binding by high frequency was subordinated to the use of a unique material for, on the one hand, the cover and on the other hand, the leaflets. Thus French Patent No. 2,616,380 proposes a method of manufacturing a binding with a fixed pocket using a cover and leaflets made of the same plastic material. The process is simple but the related structures obtained have several disadvantages: the fold line on which the welding between the sheets and the cover is made has a rough and unattractive appearance, the use of plastics to form the cover does not allow the decoration of it only according to a range of processes

relatively small.

  Given the impact of the decorative aesthetic factor on the consumer, the books with a paper cover, and allowing all the variants of decoration were favored. However, in the context of a paper cover, the state of the art offers no method for using the technique of high frequency welding. Much more expensive techniques such as spiral binding are commonly used to obtain

this type of product.

  The invention proposes a process of high frequency binding of a structure consisting of PVC sheets and a cover whose exterior is not PVC and a structure obtained by said method. The process is characterized in that it adheres a PVC sheet to the inside of the cover, arranges the PVC stacked leaflets on the cover and welds the sheets and the cover at a high frequency.

  crease line by applying high-pressure welding

  frequency on either side of this fold line.

  The welding means used are the conventional means used in the field of binding and

consisting of two electrodes.

  -3 - Despite the presence between the two electrodes of a non-weldable high-frequency material, the fusion between

the PVC elements takes place.

  According to a preferred variant, the binding method according to the invention is carried out when the PVC leaflets are

  are laid flat on the cover.

  Also preferentially, the outside of the cover is covered by paper, leather, leather

reconstituted or tissue.

  According to an advantageous variant of the invention, the PVC sheets may be in the form of closed pockets on three of their side, pouches which, during the implementation of the process and more particularly of the welding step, will be divided into two independent compartments allowing the protection of documents such as

photos.

  Also preferably the cover consists of a paper coating on the outside of two flat rigid or semi-rigid material interrupting at the fold line and inside a PVC sheet. This makes it possible to stiffen the cover despite the fact that the PVC sheet disposed inside said

  coverage can ensure this function alone.

  Advantageously, the thickness of the material constituting the outside of the cover at the fold line

is less than 3 millimeters.

  The invention also relates to a structure consisting of PVC sheets and a cover obtained by the high-frequency binding method previously described, that is to say having a cover whose outside is constituted by a non-weldable material by high frequency and whose

  the inside consists of a PVC sheet.

  Preferably, the outside of the cover of the structure according to the invention is made of paper, leather or leather

reconstituted or fabric.

  The invention as well as its advantages are more precisely described by means of the exemplary embodiment given below with reference to the attached figure showing a perspective view of a structure consisting of PVC-4-1 pouches and a cover 2 whose exterior is not PVC

can serve as a photo album.

  The cover 2 is made by arranging two separate cardboard dishes at the level of the space to be bound on a sheet of printed gloss paper 3 of slightly larger size by gluing the edge of this sheet of paper on the inner face of the cardboard plates and then sticking on the inside 4 of the cover a sheet of VC 5. A stack of PVC sheets 1 constituting pouches

  is placed next to the blanket and flat on the blanket

  this. The high-frequency welding means 6 are arranged on either side along the fold line 7 so as to allow the passage of the high-frequency current for melting the plastic material and the constitution of the binding. When the PVC melts, the pockets tend to recover. The resulting book has a high quality binding with a PVC interior and a blanket

printed paper.

- 5 -

Claims (6)

  1) Method of high frequency binding of a structure consisting of PVC sheets (1) and a cover (2) whose interior is not PVC, consisting of gluing inside (4) of the cover (2) a PVC sheet (5), arranging the stacked PVC sheets (1) on the cover (2) - and welding the sheets (1) and the cover at a line by high frequency folding (7) by applying high-frequency welding means (6) on both sides of this fold line (7).   2) binding method according to the preceding claim characterized in that the welding is performed when the   PVC sheets (1) are laid flat on the cover.   3) A method of high frequency binding according to claim 1 characterized in that the material (3) constituting the outside of the cover (2) is paper,   leather, reconstituted leather or fabric.   4) High frequency binding method according to one   previous claims characterized in that the   leaflets (1) are constituted by pouches.   ) High frequency binding method according to one   of the preceding claims characterized in that the   cover (2) consists of a paper outer covering, of two flat rigid or semi-rigid material interrupting at the fold line (.7) and &   the inside of a PVC sheet (5).   6) High frequency binding method according to one of   of the preceding claims characterized in that   the thickness of the material (3) constituting the outside of the cover (2) at the fold line is less than at 3 millimeters.   - 6 - 7) Work consisting of PVC sheets (1) and a   cover (2) obtained by the high-binding process   frequency according to one of the preceding claims   characterized in that the outside of the cover (2) consists of a non-weldable high frequency material and in that the inside (4) of the cover is formed by a PVC sheet (5).   8) A work according to claim 7 characterized in that the material constituting the outside of the cover is paper, leather, reconstituted leather or fabric, and in that   that the leaflets (1) are pouches.