WO1991011555A1 - Procede de fabrication de produits moules a parois epaisses, en particulier pour l'emballage - Google Patents

Procede de fabrication de produits moules a parois epaisses, en particulier pour l'emballage Download PDF

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Publication number
WO1991011555A1
WO1991011555A1 PCT/DE1991/000067 DE9100067W WO9111555A1 WO 1991011555 A1 WO1991011555 A1 WO 1991011555A1 DE 9100067 W DE9100067 W DE 9100067W WO 9111555 A1 WO9111555 A1 WO 9111555A1
Authority
WO
WIPO (PCT)
Prior art keywords
suction
suspension
holes
raw material
suction surface
Prior art date
Application number
PCT/DE1991/000067
Other languages
German (de)
English (en)
Inventor
Hans Viessmann
Thomas Viessmann
Gerhard Schneider
Original Assignee
Viessmann Werke Gmbh & Co.
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 Viessmann Werke Gmbh & Co. filed Critical Viessmann Werke Gmbh & Co.
Priority to AT91902425T priority Critical patent/ATE92125T1/de
Priority to DE9191902425T priority patent/DE59100232D1/de
Priority to CA002069295A priority patent/CA2069295A1/fr
Publication of WO1991011555A1 publication Critical patent/WO1991011555A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • the invention relates to a method and a suction mold for producing thick-walled shaped pieces, in particular for packaging purposes.
  • Such known fittings are sufficient, for example in the form of "egg crates” or bowl-like fruit and vegetable bases, despite their thin walls, but they are not suitable for replacing polystyrene fittings that need ⁇ are maneuverable to fix heavier objects, for example devices of all kinds or device parts in a packaging carton, although this would be highly desirable from an environmental point of view.
  • devices, equipment parts or, for example, wine and champagne bottle containers are still introduced in shape-matched polystyrene moldings and in corresponding cardboard packaging, since only with such moldings can a non-displaceable storage in the cardboard box and, in addition, break-proof shipping or Transport are guaranteed.
  • the invention is accordingly based on the object of improving the known method of suction shaping and the suction forms necessary for this in such a way that starting from waste paper and / or cardboard waste in the form of chips, there is sufficient thick-walled material with regard to stability and also as immediate removal as possible from the suction mold Shaped bodies should be able to be produced.
  • the decisive factor here is that according to the invention the suction is no longer brought into effect directly as before by a fine-meshed and in this respect only to a limited extent stable suction surface, but by a relatively coarsely perforated support and at least one so-called permeable layer arranged directly in front of it with a smaller mesh size measured from the hole size.
  • the attainable and surprising effect of a larger material suction strength is probably at least partly explained by the fact that cross-currents can apparently form between the perforated support and the fine-meshed, permeable layer, which pull the suction with already deposited raw material Allow it to remain effective for a longer period of time, so that overall thicker material deposits result, which can neither be th carrier can still be achieved with a fine-meshed sieve molding alone.
  • the dimensionally stable support permits a higher suction pressure, which leads to a greater material precipitation strength.
  • the negative pressure is maintained for a certain period of time in order to at least roughly dewater the shaped piece, which, however, due to its wall thickness and despite the residual water content still present, is already inherently stable so that it is already stable can be removed from the suction mold while also maintaining its predetermined shape.
  • the larger wall thickness after drying of the shaped part also ensures that it has sufficient stability or rigidity to be able to serve as a replacement for the polystyrene shaped pieces.
  • the method according to the invention also has the great advantage, of course, that waste paper and / or cardboard waste only needs to be comminuted but not processed for fiber digestion, i.e.
  • the wastes shredded into chips are simply added to the suspension liquid, softened and then the suspension enriched with chips can be processed directly.
  • the main concern of the method according to the invention is to process the raw material in the form of chips and thus to be able to produce shaped pieces with a sufficiently large wall thickness, it is also possible to dissolve the paper waste before processing into individual fibers and to separate them or, for example to use sanded wood for the suspension. As has been shown, it is also not absolutely necessary to add additional binders to a suspension of chips in the water, since in any case sufficient chip cross-links result during the suction process, which then impart a sufficiently stable internal structure to the respective molded piece in the finished state. In addition, the raw material to be processed also brings with it a certain proportion of binder that has dissolved in the suspension.
  • binders are still added to the suspension, then such binders are suitable as are customary in paper manufacture, for example rosin saponified with boiling soda solution or sodium hydroxide solution, but also phenolic resins, coumarone resins, montan resins or Resins from cell lye.
  • resin glues additives for sizing can also be casein, starch, animal glue, water glass or the like. come into use.
  • FIG. 3 shows a plan view of the suction surface from the raw material support side
  • FIG. 1 A section through a suction box; 5 shows a section through a suction box in a special embodiment;
  • Figure 6 seen the view of a fitting from the "raw side”.
  • FIG. 7 shows a section through the molding according to FIG. 6 in connection with an object to be packaged
  • Fig. 10 in perspective and cut the example of a fitting
  • FIG. 11 shows a flow diagram of the method.
  • the suction mold consists of a suction box 1 with a vacuum or vacuum connection 2 and a suction surface 3 adapted to the desired shape of the shaped piece VS.
  • the suction box 1 is provided with a cover 9, this has a correspondingly large inflow connection 10 for the suspension, through which the suspension flows when the entire molding box 1 is exchanged for the suspension in the mold cavity.
  • the suction surface 3 according to FIG.
  • the suction surface 3 consists of a dimensionally stable support 4 Holes 5 distributed over the suction surface and spaced apart from one another (see also FIG. 3), the carrier 4 on the side on which the shaped piece VS is to be formed having at least one fine-meshed layer 6 such as mesh, grid or Fabric layer (for example made of nylon) is covered, the mesh size of which is kept considerably smaller than the cross section of the holes 5.
  • the holes 5 have a diameter D of 1 to 2 mm, preferably 1.5 mm and a distance A from one another 4 to 6 mm, preferred 5 mm.
  • copper wire mesh is used for the layer 6, which has a wire thickness of 0.2 to 0.4 mm, the wires 7 in the fabric being at a distance Aj of 0.3 to 0.5 mm from one another. It has proven to be particularly advantageous and effective that the crossing wires 7 of the single-mesh layer 6 extend in two planes E, as illustrated in FIG. 2.
  • the mesh size of the individual layers may well be the same or approximately the same as the size of the holes 5, since this results in a staggering of the passages in the depth.
  • one or more layers 6 can also take over the function of the carrier 4, ie replace it, the layer 6 'on the suction side imparting its fine surface structure to the molded part. With such a design it is of course a prerequisite that the material for the layers 6 is a dimensionally stable material, ie it must not be a soft textile fabric, for example.
  • the material to be used for the formation of the layer 6 can be both dimensionally stable and, preferably, dimensionally stable material, in the latter case there being the possibility, for example, of the layer 6 by pressing in corresponding tools of the shape of the Adjust carrier 4 and to fix them on the carrier 4 in a suitable manner.
  • the top view (in the direction of arrow P according to FIG. 2) in FIG. 3 corresponds to the dimensions of an actual embodiment, in which the holes 5 have a hole size of approximately 1 mm in diameter, the layer 6 being two to four times larger has a smaller mesh size, and furthermore flat F and strip-shaped wastes SA, as shown, are contained in the supplied suspension.
  • Flat waste i.e. chips, has sizes of about 1 to 6 cm2, with which the best results could be achieved.
  • Stiff-shaped that is to say acid-herb-like waste SA, such as is obtained when comminuting, for example, document papers, has dimensions of about 1 to
  • suction surfaces 3 in the mold boxes 1 according to FIGS. 4, 5 are shown there in the simplest form. Different and much more complicated shapes of the carrier 4 and the associated position
  • the suction mold F in that it is at least in two parts and thus the molded parts Fi and F 2 to be movable apart.
  • a suitable joint 14 is sufficient for being able to swing open the upper mold parts 9.
  • the shaped piece which is formed is in a position to withstand the loads which occur when the shape is divided, ie not to tear. With the greater wall thickness that can be achieved, there is also the advantage of being able to be shaped using divisible shapes. In the shapes shown in FIGS. 4, 5, the covers 9 result in clean edges on the shaped pieces.
  • the special feature of the design of the suction form F according to FIG. 5 is that in the form F there is at least one further suction surface 3 'with a separate suction box 1' on the suction side, this suction box 1 'having a separate suction nozzle 1 "
  • the further suction surface 3 ' is assigned with its area 8 close to the other suction surface 3 at a distance Di which corresponds to a maximum of approximately twice the wall thickness S of the molded part VS to be produced.
  • Di corresponds to a maximum of approximately twice the wall thickness S of the molded part VS to be produced.
  • FIG. 6 shows a view of a molded part VS produced from the non-smooth side
  • FIG. 7 shows a section through such a molded part, wherein, as can also be seen from FIG. 7, two such shaped pieces serve to fix an object G to be packaged in a cardboard box K.
  • the web cavities 13, as indicated in FIG. 6, result from the suction surfaces 3 ′ additionally arranged in the form F according to FIG. 5.
  • the spacing of the holes 5 in the carrier 4 from one another is concerned, it is important to note in this regard that on the one hand a sufficiently large suction cross section is created on the one hand and on the other hand the carrier 4 is sufficiently stable to withstand high vacuum (e.g. 120 mb) not related to deform its given shape.
  • the spacing values are also fluid here, since they depend on the hole size, the carrier material, the wall thickness of the carrier and ultimately also on the material of the fine-mesh layer 6 applied directly to the carrier 4. So far, too the hole spacing (for example corresponding to the diameter of the holes 5) is also a factor to be considered for the wall thickness of the shaped pieces to be achieved.
  • FIG. 11 shows the flow diagram of the entire process.
  • the paper waste 16 is brought to the desired shredder size in a suitable shredding machine 17 and conveyed into the mixing tank 18, to which a sufficient quantity of suspension liquid is fed from a tank 19.
  • This liquid with the contained therein and on softened wafers then passes into the actual work basin 20, into which the molded boxes 1 are immersed with a suitable lifting mechanism 21, these molded boxes 1 via a vacuum line 22 and a pressure-tightly closed separation container 23 with a vacuum pump 24 are connected on the suction side.
  • the aspirated liquid is returned from the container 23 to the tank 19 by a pump 25 and from there takes part in the cycle again.
  • all tanks and containers are provided in duplicate and are accordingly integrated into the system accordingly. This double arrangement serves, in particular, to have sufficient time in the mixing containers 18 for continuous production to soften the batch of chips entered in each case.
  • the chips produced from the paper waste 16 with the comminuting machine 17 have a shape that cannot be defined geometrically, but a cut size of the order of 1 to 6 cm 2.
  • Approx. 500 liters of liquid with a quantity of chips of 3 to 5 kg are prepared and mixed in the mixing container.
  • the liquid temperature corresponds to the normal ambient or line temperature, but can be increased if this should require the peculiarity of the chips.
  • the residual moisture in the molding produced depends on how long the suction pressure remains on the molding box 1 when it is is lifted out of the suspension in the working pool 20 by means of the lifting mechanism 21. After removal from the molding box 1, the molding or the molding is dried in a dryer 26.

Abstract

L'invention concerne un procédé pour la fabrication de produits moulés à parois épaisses (VS) en particulier pour l'emballage, dans lequel le matériau brut contenu dans une suspension aqueuse, en particulier les vieux papiers et/ou les déchets de cartonnage sont aspirés à partir de la suspension au moyen d'un tamis de feutrage sur la surface d'aspiration (3) correspondant à la forme du produit moulé d'emballage (VS). Pour pouvoir fabriquer ces produits moulés (VS) par aspiration avec des parois suffisamment épaisses, le procédé objet de l'invention consiste en ce que, sur le matériau brut en suspension à aspirer dans la suspension, la succion au niveau du tamis de feutrage s'exerce par des orifices (5) mutuellement espacés de la surface d'aspiration (3) et par un lit (6) constitué d'une ou plusieurs couches, disposé immédiatement devant la surface d'aspiration et exposé à l'effet de succion, les mailles de ce lit étant inférieures au diamètre des orifices.
PCT/DE1991/000067 1990-01-24 1991-01-23 Procede de fabrication de produits moules a parois epaisses, en particulier pour l'emballage WO1991011555A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT91902425T ATE92125T1 (de) 1990-01-24 1991-01-23 Verfahren zur herstellung von dickwandigen formstuecken, insbesondere fuer verpackungszwecke.
DE9191902425T DE59100232D1 (de) 1990-01-24 1991-01-23 Verfahren zur herstellung von dickwandigen formstuecken, insbesondere fuer verpackungszwecke.
CA002069295A CA2069295A1 (fr) 1990-01-24 1991-01-23 Procede de fabrication d'articles faconnes a parois epaisses, servant notamment a des fins d'emballage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4001918.7 1990-01-24
DE4001918A DE4001918C1 (fr) 1990-01-24 1990-01-24

Publications (1)

Publication Number Publication Date
WO1991011555A1 true WO1991011555A1 (fr) 1991-08-08

Family

ID=6398618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1991/000067 WO1991011555A1 (fr) 1990-01-24 1991-01-23 Procede de fabrication de produits moules a parois epaisses, en particulier pour l'emballage

Country Status (7)

Country Link
EP (1) EP0504311B1 (fr)
AT (1) ATE92125T1 (fr)
CA (1) CA2069295A1 (fr)
DE (2) DE4001918C1 (fr)
DK (1) DK0504311T3 (fr)
ES (1) ES2044722T3 (fr)
WO (1) WO1991011555A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993018230A1 (fr) * 1991-03-05 1993-09-16 Charles Ulbricht Systeme d'emballage constitue de plaques d'insonorisation, d'isolation et de support

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332680A1 (de) * 1993-09-25 1995-03-30 Karl Schenk Inh Roland Schenk Formen zum Gießen und/oder Handhaben von Formteilen
JPH09203423A (ja) * 1996-01-25 1997-08-05 Toyota Motor Corp 防錆カバーの製造方法及びこれを用いた防錆カバー
WO2003018911A1 (fr) * 2001-08-16 2003-03-06 Arnulfo Lopez Hernandez Piñatas et figures decoratives en papier et carton recycle elaborees a l'aide d'une chambre a vide pousse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3261740A (en) * 1963-09-27 1966-07-19 Diamond Int Corp Method and mold for producing multilayer absorbent tray
DE1436933A1 (de) * 1964-03-18 1969-07-03 Diamond Int Corp Verfahren und Vorrichtung zum Formen von Papierstoff
FR2270373A1 (fr) * 1974-05-09 1975-12-05 Int Paper Co
DE2644487A1 (de) * 1975-10-02 1977-05-12 Idra Ag Sarg und verfahren zu dessen herstellung
EP0153101A2 (fr) * 1984-02-10 1985-08-28 VERNON & COMPANY (PULP PRODUCTS) LTD. Dispositif et méthode pour former sous vide un article de pâte fibreuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3261740A (en) * 1963-09-27 1966-07-19 Diamond Int Corp Method and mold for producing multilayer absorbent tray
DE1436933A1 (de) * 1964-03-18 1969-07-03 Diamond Int Corp Verfahren und Vorrichtung zum Formen von Papierstoff
FR2270373A1 (fr) * 1974-05-09 1975-12-05 Int Paper Co
DE2644487A1 (de) * 1975-10-02 1977-05-12 Idra Ag Sarg und verfahren zu dessen herstellung
EP0153101A2 (fr) * 1984-02-10 1985-08-28 VERNON & COMPANY (PULP PRODUCTS) LTD. Dispositif et méthode pour former sous vide un article de pâte fibreuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993018230A1 (fr) * 1991-03-05 1993-09-16 Charles Ulbricht Systeme d'emballage constitue de plaques d'insonorisation, d'isolation et de support

Also Published As

Publication number Publication date
EP0504311A1 (fr) 1992-09-23
EP0504311B1 (fr) 1993-07-28
CA2069295A1 (fr) 1991-07-25
ES2044722T3 (es) 1994-01-01
DE4001918C1 (fr) 1991-04-04
DK0504311T3 (da) 1993-10-18
DE59100232D1 (de) 1993-09-02
ATE92125T1 (de) 1993-08-15

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