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
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/56—Winding and joining, e.g. winding spirally
  • B29C53/58—Winding and joining, e.g. winding spirally helically
  • B29C53/60—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels
  • B29C53/602—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels for tubular articles having closed or nearly closed ends, e.g. vessels, tanks, containers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D22/00—Producing hollow articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts

Definitions

• the present invention is concerned with a method for the manufacture of the mantle portion of a cistern of reinforced plastic, whereat a prefabricated thin layer, one of whose side faces is possibly provided with a layer of a material resistant to corrosion and chemicals, is cut into rectangular shape with dimensions corresponding to the desired length of the mantle portion and preferably to its entire circumference, the said layer being formed to a substantially cylindrical form, with the said layer being directed inwards, and so that the two rectilinear opposite edges of the full-size layer are placed one against the other and joined to ⁇ gether by means of reinforcement and resin so that a continuous mantle face with desired dimension is ob ⁇ tained, whereupon reinforcement and resin are applied onto the thin cylindrical mantle face by winding around the mantle face along a preferably slowly rising spiral- shaped path until desired wall thickness is reached, whereupon the mantle portion is ready for being provided with end pieces or end flanges.
• moulds of inflatable type which can be used for the manufacture of mantle faces of diameters within certain limits, e.g. between 300 and 2,500 mm or similar. Out of both technical and economic points of view, it is not profitable to manufacture such moulds for diameters in excess of 3,500 mm.
• the object of the present invention is to eliminate the above problem, which is achieved by means of a method which is characterized in that the ready-cut thin layer is rolled together into a roll, which is thereupon placed vertically on a base for rolling up and for forming to the said cylindrical form, whereupon a number of detachable support rings are inserted into the object formed, which is not of entirely rigid shape, before lamination.
• Figure 1 is a side view of a cistern manu ⁇ factured in accordance with the invention
• Figure 2 is a perspective view of a pre ⁇ fabricated layer.
• Figure 3 is an illustration of principle of a ready-cut layer that has been rolled together.
• Figure 4 is an illustration of principle of the layer of Fig. 3 as rolled to the cylindrical form.
• Figure 5 is a side view of a cistern during manufacture as per the invention.
• OMPI Fig. 6 shows the cistern of Fig. 5 as viewed from the top.
• a cistern of reinforced plastic consists of a mantle portion 1 and of two end pieces 2, the said end pieces 2 being formed against an inner mould.
• the mantle portion 1 and also the end pieces 2 usually comprise an inner layer, which partly consists of a layer of a material resistant to corrosion and chemi ⁇ cals, a support layer consisting of several layers of reinforcement material and resin, and finally a pos ⁇ sible outer layer of reinforcement and resin, which is illustrated in the inset detail enlargement A in the drawing.
• the mantle portion is manufactured as follows: Out of a prefabricated thin layer 1a, whose thickness is, e.g., 2.5 mm and one of whose side faces is possibly provided with a layer of a material resis ⁇ tant to corrosion and chemicals, as is shown in the detail enlargement C in the drawing, a rectangular sheet is cut out whose dimensions correspond to the desired length of the mantle portion and preferably to its entire circumference. The cut-out layer is appropriately rolled into a roll in accordance with Fig.
• the cut-out layer has a length corresponding to the entire circumference of the mantle face.
• mantle portion 30 onto the mantle face. This goes on as long as the desired thickness is obtained for the ultimate mantle portion. If desired, certain parts of the mantle portion may be provided with a thicker laminate layer if the construction of the cistern so requires.
• the base 4 on which the thin mantle face 1a is ' formed and the subsequent lamination takes place appropriately consists of a rotary table 4, the centering taking place, e.g., by means of the inserted support rings 3.
• the reinforcement 5 and the resin are appropriately applied onto the revolving mantle face by means of an application device 6 , which is arranged so as to run back and forth along a vertical guide 7 placed at the rotary table 4. The movement of the application device back and forth takes place either manually or fully automatically.
• the application device may be appropriately arranged so that it cuts the rein ⁇ forcement threads 5 into short pieces, which are, by means of a nozzle, sprayed onto the mantle face 1a to ⁇ gether with the resin.
• the reinforcement appropriately consists of fibreglass threads or bands, but other fibrous materials, such as graphite, carbon fibre, asbestos fibre and equivalent, may also be concerned.
• support rings 3 are appropriately inserted into both of its ends and to the proximity of its middle portion.
• Another embodiment of the method involves that the cylindrical thin mantle face 1a is formed in the vertical position on a stationary base, whereas the application device 6 is arranged so as to be guided around the mantle face 1a along a circular path at the same time as it is slowly guided upwards and downwards so that reinforcement and resin are applied onto the mantle face in a spiral form.
• the application device 6 is arranged so as to be guided around the mantle face 1a along a circular path at the same time as it is slowly guided upwards and downwards so that reinforcement and resin are applied onto the mantle face in a spiral form.
• a highly advantageous procedure involves that one of the end pieces 2 or an end flange constitutes a support ring for the bottom end of the mantle face on formation of the mantle face la to the cylindrical form, whereat the end piece 2 and the mantle face 1a are fixed to each other by means of point lamination as the mantle face 1a is being rolled up off the roll.
• the rotary table 4 In order that a sufficiently robust base should be obtained for the cistern during the formation and lamination, the rotary table 4 must be provided with an appropriate stand shaped in accordance with the bottom contour of the end piece 2. It may also prove necessar to attach the end piece, and so also the cistern, to the rotary table by means of through-going bolts.
• the longitudinal joint formed is point-laminated, whereupon support rings 3 are possibly inserted into the hollow space inside the mantle face 1a, and. he upper end piece 2 is placed onto the top end of the mantle face and fixed by means of point lamination.
• the joints thereby formed are completed by lamination, whereupon the support layer of the mantle portion 1 is applied by lamination in the way indicated above.
• the support rings 3 can be disassembled and removed, e.g., through manhole gates made onto the cistern.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Moulding By Coating Moulds (AREA)
• Golf Clubs (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8516070

Family Applications (1)

Country Status (5)

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Family Cites Families (6)

• 1982
  • 1982-09-23 FI FI823269A patent/FI823269L/fi not_active Application Discontinuation
• 1983
  • 1983-09-22 EP EP19830903089 patent/EP0120895A1/de not_active Withdrawn
  • 1983-09-22 WO PCT/FI1983/000061 patent/WO1984001124A1/en not_active Application Discontinuation
• 1984
  • 1984-05-22 DK DK251484A patent/DK251484A/da not_active Application Discontinuation
  • 1984-05-22 NO NO842032A patent/NO842032L/no unknown

Non-Patent Citations (1)

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