EP0504311B1 - Verfahren zur herstellung von dickwandigen formstücken, insbesondere für verpackungszwecke - Google Patents

Verfahren zur herstellung von dickwandigen formstücken, insbesondere für verpackungszwecke Download PDF

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Publication number
EP0504311B1
EP0504311B1 EP91902425A EP91902425A EP0504311B1 EP 0504311 B1 EP0504311 B1 EP 0504311B1 EP 91902425 A EP91902425 A EP 91902425A EP 91902425 A EP91902425 A EP 91902425A EP 0504311 B1 EP0504311 B1 EP 0504311B1
Authority
EP
European Patent Office
Prior art keywords
suction
type
suction surface
holes
moulding tool
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.)
Expired - Lifetime
Application number
EP91902425A
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German (de)
English (en)
French (fr)
Other versions
EP0504311A1 (de
Inventor
Hans Viessmann
Thomas Viessmann
Gerhard Schneider
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.)
Viessmann Werke GmbH and Co KG
Original Assignee
Viessmann Werke GmbH and Co KG
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Filing date
Publication date
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Publication of EP0504311A1 publication Critical patent/EP0504311A1/de
Application granted granted Critical
Publication of EP0504311B1 publication Critical patent/EP0504311B1/de
Anticipated expiration legal-status Critical
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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 the production of thick-walled shaped pieces, in particular for packaging purposes.
  • the invention is therefore based on the object to improve the known method of suction molding and the suction molds necessary for this in such a way that, in particular from waste paper and / or cardboard waste in shredded form, substantially more stable molded articles should be able to be produced.
  • the suction mold for carrying out the method, it consists of a suction box with a vacuum connection and with a suction surface corresponding to the desired shape of the packaging molding, the suction surface being made of a dimensionally stable support with holes distributed over the suction surface and spaced apart from one another, and that the support is suitable for molding with at least a fine-meshed layer, such as a mesh, grid or fabric layer is covered, the mesh size of which is kept smaller than the cross section of the holes.
  • At least one further suction surface with a separate suction box is arranged on the suction side is associated with its area close to the other suction surface at a distance that corresponds to a maximum of twice the wall thickness of the packaging molding to be produced.
  • the negative pressure is maintained for a certain period of time in order to at least roughly dewater the molding, which, however, due to its wall thickness and despite the residual water content that is still present, is already so stable that it can already be removed from the suction mold can while maintaining its specified 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.
  • waste paper and / or cardboard waste can be used without further notice, which only requires comminution but does not require preparation for fiber digestion, that is to say the wastes comminuted into chips are merely added to the suspension liquid, softened and then the suspension enriched with chips can be used can be processed directly.
  • plastic chips which are often found in paper and cardboard waste. It has been found that the presence of plastic chips in the finished shaped pieces is even advantageous, since these contribute to the increased strength of the shaped pieces, but more than 5% plastic chips should not be included.
  • binders are still added to the suspension, then such binders are suitable as are customary in paper production, for example rosin saponified with boiling soda solution or sodium hydroxide solution, but also phenolic resins, coumarone resins, montan resins or resins from pulp liquor.
  • resin glues casein, starch, animal glue, water glass or the like can also be used as additives for the sizing.
  • 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. If the suction box 1 is provided with a cover 9, as shown in FIG. 4 is, 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 with holes distributed over the suction surface and spaced apart from one another 5 (see also FIG. 3), the carrier 4 being covered on the side on which the shaped piece VS is to be formed with at least one fine-mesh layer 6 such as a mesh, grid or fabric layer (for example made of nylon), whose mesh size is kept substantially 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 each other of 4 to 6 mm, preferably 5 mm.
  • wire mesh is preferably used for the layer, which has a wire thickness of 0.2 to 0.4 mm, the wires 7 in the fabric having a distance A 1 of 0.3 to 0.5 mm. It has proven to be particularly advantageous and effective that the crossing wires 7 of the fine-meshed 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 shaped piece. 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 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 having a mesh size two to four times smaller, and further comprising flat F and strip-shaped waste SA, as shown, in the supplied slurry.
  • Flat wastes, i.e. chips have sizes of about 1 to 6 cm2, with which the best results could be achieved.
  • Stiff-shaped that is, sauerkraut-like waste SA, such as is obtained when comminuting, for example, file papers, has dimensions of about 1 to 5 mm in width and about 10 to 30 cm in length.
  • suction surfaces 3 in the mold boxes 1 according to FIGS. 4, 5 are shown there in the simplest form.
  • Other and much more complicated shapes of the carrier 4 and the associated layer 6 are, however, readily possible, care being taken only to ensure that there are no areas in which the suction-effective areas shield one another, which prevents precipitation or suction of raw material particles.
  • the suction mold F is to make these at least two parts and thus the moldings F1 and F2 movable apart .
  • a suitable hinge 14 is sufficient for being able to swing open the upper mold parts 9.
  • the shaped piece formed is in a position, owing to its larger wall thickness, 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 molds.
  • the covers 9 result in clean edges on the shaped pieces.
  • FIG. 5 is that at least one further suction surface 3 'with a separate suction box 1' is arranged on the suction side F, this suction box 1 'having a separate suction nozzle 1' '.
  • the further suction surface 3 ' is associated with its area 8 close to the other suction surface 3 at a distance D 1 which corresponds at most to 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 and FIG. 7 shows a section through such a molded part, wherein, as also from FIG. 7 It can be seen that two such shaped pieces serve to fix an article 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 to deform in relation to its specified shape.
  • the distance values are fluid, 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-meshed 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 is conveyed into the mixing tank 18, to which a sufficient quantity of suspension liquid is fed from a tank 19.
  • This liquid with the chips contained therein and softened then passes into the actual work basin 20, into which the molding boxes 1 are immersed with a suitable lifting mechanism 21, these molding boxes 1 being connected on the suction side to a vacuum pump 24 via a vacuum line 22 and a pressure-tightly closed separating container 23 are.
  • 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 twice and are accordingly integrated into the system. This double arrangement serves, in particular, to have sufficient time in the mixing containers 18 for the continuous input of the softening of the batch of chips entered in each case.
  • the chips produced from the paper waste 16 with the shredding 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 is required by the peculiarity of the schnitzel.
  • the residual moisture in the molding produced depends on how long the suction pressure on molding box 1 remains when it comes from the suspension in the Working pool 20 is lifted out 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.
  • the molded part VS that can be produced with the method and the device according to the invention is shown in perspective in FIG. 10, the illustrated shape being to be understood only as an example. It is important here that stiffening web designs 11 are present in the channel 30 on the raw side of the shaped piece VS, which is only indicated by dashed lines at one point, which limit the web cavities 13. Seen from the raw side (in the direction of arrow 31), these web cavity spaces 13 have smooth walls and have a bottom 32 which has twice the wall thickness S of the fitting VS. As can be seen from FIG. 6, a plurality of such web cavities 13 can be provided on the rear or raw side of the shaped piece, i.e. a corresponding number of additional, separate suction boxes 1 'are then arranged in the suction mold according to the invention according to FIG. These additional suction boxes 1 'are attached to the cover 9, which has correspondingly large mass inflow openings 33.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Making Paper Articles (AREA)
EP91902425A 1990-01-24 1991-01-23 Verfahren zur herstellung von dickwandigen formstücken, insbesondere für verpackungszwecke Expired - Lifetime EP0504311B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4001918 1990-01-24
DE4001918A DE4001918C1 (da) 1990-01-24 1990-01-24

Publications (2)

Publication Number Publication Date
EP0504311A1 EP0504311A1 (de) 1992-09-23
EP0504311B1 true EP0504311B1 (de) 1993-07-28

Family

ID=6398618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91902425A Expired - Lifetime EP0504311B1 (de) 1990-01-24 1991-01-23 Verfahren zur herstellung von dickwandigen formstücken, insbesondere für verpackungszwecke

Country Status (7)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4106986A1 (de) * 1991-03-05 1992-09-10 Charles Ulbricht Verpackungssystem daemm-, isolier- sowie traegerplatte
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 (es) * 2001-08-16 2003-03-06 Arnulfo Lopez Hernandez Piñatas y figuras decorativas de papel y carton reciclado elaboradas con una camera de alto vacio

Family Cites Families (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
US3325349A (en) * 1964-03-18 1967-06-13 Diamond Int Corp Method and mold for controlling stock thickness in a pulp molding operation
US4014739A (en) * 1974-05-09 1977-03-29 International Paper Company Mold construction having removable base member
US4034447A (en) * 1975-10-02 1977-07-12 Idra Ag Papier-mache coffin
GB8403507D0 (en) * 1984-02-10 1984-03-14 Vernon & Co Pulp Prod Moulding

Also Published As

Publication number Publication date
CA2069295A1 (en) 1991-07-25
DK0504311T3 (da) 1993-10-18
EP0504311A1 (de) 1992-09-23
WO1991011555A1 (de) 1991-08-08
ATE92125T1 (de) 1993-08-15
DE4001918C1 (da) 1991-04-04
DE59100232D1 (de) 1993-09-02
ES2044722T3 (es) 1994-01-01

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