EP0000058A1 - Verfahren und Vorrichtung zum kontinuierlichen Herstellen von Schaumstoffblöcken mit Rechteckquerschnitt - Google Patents

Verfahren und Vorrichtung zum kontinuierlichen Herstellen von Schaumstoffblöcken mit Rechteckquerschnitt Download PDF

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Publication number
EP0000058A1
EP0000058A1 EP78100100A EP78100100A EP0000058A1 EP 0000058 A1 EP0000058 A1 EP 0000058A1 EP 78100100 A EP78100100 A EP 78100100A EP 78100100 A EP78100100 A EP 78100100A EP 0000058 A1 EP0000058 A1 EP 0000058A1
Authority
EP
European Patent Office
Prior art keywords
reaction mixture
zone
block
foam
rectangular cross
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Withdrawn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
EP78100100A
Other languages
German (de)
English (en)
French (fr)
Inventor
Alberto Carlos Dr. Gonzalez-Dörner
Hansjürgen Dr. Rabe
Günter Dr. Hauptmann
Karl Josef Dr. Kraft
Manfred Dr. Roegler
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP0000058A1 publication Critical patent/EP0000058A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/461—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length dispensing apparatus, e.g. dispensing foaming resin over the whole width of the moving surface
    • B29C44/462—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length dispensing apparatus, e.g. dispensing foaming resin over the whole width of the moving surface provided with pre-foaming devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/467—Foam spreading or levelling devices

Definitions

  • the invention relates to a method and a device for the continuous production of foam blocks with a rectangular cross-section from a foamable reaction mixture, in particular based on polyurethane, the reaction mixture being fed into a continuous trough in which the reaction mixture foams to form a block.
  • Block foam is usually cut to the appropriate size into cushioning material, insulating material, foil material, etc.
  • the purpose of producing endless foam blocks with a rectangular cross section is to reduce the amount of waste.
  • a block foaming system is known in which the reactive mixture is fed into the bottom of a trough, which is at the inlet current of a conveyor is arranged.
  • the mixture already reacts in the trough to a state in which it is just still flowable, and reaches a sloping plane via a weir, which is arranged in the foaming zone and over which a base film is passed.
  • This inclined plane is inclined in such a way that the surface of the resulting foam block runs horizontally or is aligned parallel to the inclination of the actual conveyor belt which follows the inclined plane and which is inclined approximately between 3 and 10 °.
  • a block with a rectangular cross-section is created; however, it has a leather-like skin on the surface.
  • the block height is not much larger than about half the block width.
  • a block foaming system is known from DT-OS 2 12.3 21c (corresponds to US Pat. No. 3,924 925), in which the surface of the resulting block is covered with a cover film along the foaming zone and leveled transversely to the conveying direction by means of a leveling device.
  • This avoids the formation of leather-like skin; as a block height, however, a height is also only slightly above half the block width. It has proven to be disadvantageous that the bottom zone of the foam block has a higher compression, so that special attention must be paid to this deficiency in the further processing of the foam.
  • the object of the invention is a method and a device with which one can produce endless foam blocks, the height of which is substantially greater than half the block width and have a homogeneous cross section, and also largely have the same density as the core in the bottom zone and in the top zone.
  • the reaction mixture is allowed to react before application and the block surface is kept level by the downward reaction of the applied reaction mixture in the foaming zone on the conveying surface or the cover sheet conveyed thereon
  • the reaction foams in the method according to the invention Mix up beyond that level so that ideally the angle of inclination of the conveying surface and the angle of rise of the foam surface in the foaming zone are the same.
  • the process according to the invention is suitable for the production of endless foam blocks made of polyurethane, polycarbodiimide polyisocyanurate or combinations of these plastics.
  • Paper sheets made of normal or plastic-coated kraft paper are used as top or bottom and side foils.
  • Nonwovens, textile webs as well as plastic films and foam films, metal films and combinations of these materials are also used.
  • the more noble materials are only used if the top and / or bottom layer of the foam block is to be used for a particular purpose as a product laminated with the top layer.
  • the invention is based on a device consisting of a mixture feed device and a conveyor with side boundaries and unwinding stations for bottom, side and cover foils.
  • the intermediate storage trough can, as already described in relation to the prior art, be arranged in front of the inlet end of a conveyor.
  • the intermediate storage trough can also be provided on the inlet end of a conveyor.
  • the conveying surface is inclined downwards in the Aufsenosumzone.
  • the inclination can vary over the length of the conveying surface in order to adapt it to the degree of foaming over time.
  • the conveyor surface can be designed, for example, as a stationary, possibly multi-part plate or as a separate conveyor belt to which the actual conveyor belt is connected. However, only a single conveyor belt can also be provided, the first part of which is guided at a corresponding incline.
  • a slatted frame which is particularly lightweight, is preferably used as the leveling device.
  • pressure plates can also be provided which are elastically suspended perpendicular to the conveying direction. Skids arranged transversely to the conveying direction and provided with counterweights are also known. Also a circumferential band, the lower strand of which loosely on the surface of the Ge being foamed mixed down, was already used.
  • Such a belt can consist of a rubberized fabric belt, but can also be constructed in the manner of an endless, slatted frame.
  • the feed device and leveling device are preferably designed to be adjustable in width in a manner known per se.
  • the feed device 1 consists of a mixing head 2 and a trough 3, in the lower area of which leads away from the mixing head 2 feed line 4.
  • An inclined conveying surface 6 is arranged in the foaming zone 5. It consists of a circumferential belt 7, the upper run 8 is backed with adjustable plates 9, 10, 11, so that, seen over the length, the conveying surface 6 has different angles of inclination.
  • a tensioning device 12 ensures constant tension of the belt 7.
  • the actual conveyor belt 13 connects to the belt 7.
  • An insert 14 bridges the gap between the two belts 7, 13.
  • the belts 7, 13 are covered by a base film 15, onto which the mixture which has reacted in the trough 3 is fed.
  • the bands 7, 13 are delimited by side boundaries 16 (only the rear one is shown) which are covered with side foils 17.
  • a cover film 18 is placed on the foaming mixture at the beginning of the foaming zone 5 and guided under a leveling device 19. It consists of a slatted frame 20 which is suspended from a frame 22 by means of belts 21. The height of the block 23 corresponds to its width of 2 m.
  • the feed device 31 consists of a mixing head 32 and a trough 33, to which the reaction mixture is fed from above via a transverse distributor pipe 34 and a guide plate 35. Finally, the mixture passes through a feed plate 36 onto the base sheet 37, which is guided over a table 38 in this area.
  • the bottom film 37 then reaches a conveying surface 40 which is arranged in the foaming zone 39 and is designed as an angle-adjustable plate. Behind it is the actual conveying belt 41 which is correspondingly height-adjustable in order to be able to adapt it to the angular setting of the conveying surface 40.
  • a cover film 42 is placed on the surface of the reaction mixture and carried out under a leveling device 43.
  • the finished block 50 has a width of 2.10 m and a height of 1.80 m.

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP78100100A 1977-06-10 1978-06-06 Verfahren und Vorrichtung zum kontinuierlichen Herstellen von Schaumstoffblöcken mit Rechteckquerschnitt Withdrawn EP0000058A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19772726084 DE2726084A1 (de) 1977-06-10 1977-06-10 Verfahren und vorrichtung zum kontinuierlichen herstellen von schaumstoffbloecken mit rechteckquerschnitt
DE2726084 1977-06-10

Publications (1)

Publication Number Publication Date
EP0000058A1 true EP0000058A1 (de) 1978-12-20

Family

ID=6011121

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100100A Withdrawn EP0000058A1 (de) 1977-06-10 1978-06-06 Verfahren und Vorrichtung zum kontinuierlichen Herstellen von Schaumstoffblöcken mit Rechteckquerschnitt

Country Status (5)

Country Link
EP (1) EP0000058A1 (es)
JP (1) JPS544963A (es)
DE (1) DE2726084A1 (es)
ES (1) ES470664A1 (es)
IT (1) IT7824356A0 (es)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255105A (en) * 1979-06-15 1981-03-10 Bayer Aktiengesellschaft Equipment for the continuous production of foam boards
US4264291A (en) * 1979-06-15 1981-04-28 Bayer Aktiengesellschaft Equipment for the continuous production of foam boards
US4267134A (en) * 1979-09-24 1981-05-12 The Upjohn Company Method and apparatus for smoothing foamed plastic core panelboard surface
US4270889A (en) * 1979-06-15 1981-06-02 Bayer Aktiengesellschaft Equipment for the continuous production of foam boards
US4347281A (en) * 1980-01-17 1982-08-31 Imperial Chemical Industries Limited Foam board having improved evenness and the method and apparatus for its continuous manufacture
US4530807A (en) * 1983-05-20 1985-07-23 Unifoam Ag Production of polymeric foam
US4559003A (en) * 1981-03-24 1985-12-17 Jean Poncet Apparatus for manufacturing webs of polymer foam and a product obtained
USRE33590E (en) * 1983-12-14 1991-05-21 Edap International, S.A. Method for examining, localizing and treating with ultrasound
WO1992000184A1 (en) * 1990-06-27 1992-01-09 Unifoam Ag Manufacture of polymeric foam
US5512222A (en) * 1995-03-15 1996-04-30 Foamex L.P. Method of using a chilled trough for producing slabs of polyurethane foam
GB2365814A (en) * 2000-08-08 2002-02-27 Cannon Viking Ltd Production of foamed materials

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3553300A (en) * 1968-07-10 1971-01-05 Tenneco Chem Process for controlling the upper surface contour of foamable polyurethane during expansion in an open top mold

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3553300A (en) * 1968-07-10 1971-01-05 Tenneco Chem Process for controlling the upper surface contour of foamable polyurethane during expansion in an open top mold

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255105A (en) * 1979-06-15 1981-03-10 Bayer Aktiengesellschaft Equipment for the continuous production of foam boards
US4264291A (en) * 1979-06-15 1981-04-28 Bayer Aktiengesellschaft Equipment for the continuous production of foam boards
US4270889A (en) * 1979-06-15 1981-06-02 Bayer Aktiengesellschaft Equipment for the continuous production of foam boards
US4267134A (en) * 1979-09-24 1981-05-12 The Upjohn Company Method and apparatus for smoothing foamed plastic core panelboard surface
US4347281A (en) * 1980-01-17 1982-08-31 Imperial Chemical Industries Limited Foam board having improved evenness and the method and apparatus for its continuous manufacture
US4559003A (en) * 1981-03-24 1985-12-17 Jean Poncet Apparatus for manufacturing webs of polymer foam and a product obtained
US4530807A (en) * 1983-05-20 1985-07-23 Unifoam Ag Production of polymeric foam
USRE33590E (en) * 1983-12-14 1991-05-21 Edap International, S.A. Method for examining, localizing and treating with ultrasound
WO1992000184A1 (en) * 1990-06-27 1992-01-09 Unifoam Ag Manufacture of polymeric foam
AU635853B2 (en) * 1990-06-27 1993-04-01 Unifoam A.G. Manufacture of polymeric foam
US5393361A (en) * 1990-06-27 1995-02-28 Unifoam A.G. Manufacture of polymeric foam
US5512222A (en) * 1995-03-15 1996-04-30 Foamex L.P. Method of using a chilled trough for producing slabs of polyurethane foam
GB2365814A (en) * 2000-08-08 2002-02-27 Cannon Viking Ltd Production of foamed materials
GB2365814B (en) * 2000-08-08 2003-10-29 Cannon Viking Ltd Foam plastics method and machine
US7179410B2 (en) 2000-08-08 2007-02-20 Cannon Viking Limited Foam plastics manufacturing method and machine

Also Published As

Publication number Publication date
JPS544963A (en) 1979-01-16
IT7824356A0 (it) 1978-06-08
ES470664A1 (es) 1979-02-16
DE2726084A1 (de) 1979-01-04

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Inventor name: ROEGLER, MANFRED,DR.

Inventor name: KRAFT, KARL JOSEF,DR.

Inventor name: HAUPTMANN, GUENTER,DR.

Inventor name: RABE, HANSJUERGEN,DR.

Inventor name: GONZALEZ-DOERNER, ALBERTO CARLOS,DR.