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
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
  • B29C43/04—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles using movable moulds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
  • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
  • B05B12/20—Masking elements, i.e. elements defining uncoated areas on an object to be coated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
  • B05B7/1481—Spray pistols or apparatus for discharging particulate material
  • B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state
• • 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
  • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
  • B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
  • B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
  • B29C37/0032—In-mould coating, e.g. by introducing the coating material into the mould after forming the article the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat
• • 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
  • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
  • B29C41/34—Component parts, details or accessories; Auxiliary operations
  • B29C41/36—Feeding the material on to the mould, core or other substrate
  • B29C41/365—Construction of spray-up equipment, e.g. spray-up guns
• • 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
  • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
• • 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
  • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
  • B29K2105/0854—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns in the form of a non-woven mat
  • B29K2105/0863—SMC, i.e. sheet moulding compound

Definitions

• the present invention relates to a method and apparatus for applying a powder coating to a mould particularly to a mould for use in a pressing process for forming powder coated sheet moulded c ⁇ npound (S.M.C.) parts, such as tabletops, construction panels, bathtubs and the like.
• S.M.C. powder coated sheet moulded c ⁇ npound
• the present invention overcomes this problem by spraying the mould in a spray booth separate from the press, the booth incorporating a mould mask which is designed to confine spraying to the required mould area thereby eliminating overspray to surrounding areas.
• a method of forming powder coated sheed moulded co ⁇ pound parts comprising applying powder coating to the moulding surface of a mould, introducing moulding co ⁇ pound to the mould, pressing the charged mould in a press to transfer the powder coating to the c ⁇ rpound to form a powder coated moulded part characterised in that one mould half of the mould is retained in the press, there being two other similar mould halves of the mould which are alternatively charged with powder outside the press prior to transference consecutively to the press to mate with said one mould half, for the moulding process, the moulding surface of said other mould half being masked during the coating process to prevent overspray to surrounding areas of the moulded form thereof.
• apparatus for forming powder coated sheet moulded compound parts comprising a press for forming the parts in a mould, characterised in the provision of spraying means external to the press for spraying one mould half of the mould with powder coating, a mould mask for inserting over a said one mould part in the spraying means for preventing overspray to surrounding areas thereof other than its moulding surface, and means for transferring a said one mould half to and from said press in such a manner that as a said one mould half is being coated with powder in said spraying means, another one said mould half, which has previously been coated in said spraying means, is mated with the other mou_ldhalf.in said press for a pressing cycle.
• a spraying device for powder coating a mould half in a process for forming powder coated sheet moulded compound parts characterised in the provision of spraying means for spraying the moulded half with a powder coating material, a mo * uld mask for inserting over the mould half to shield surrounding areas of the moulding surface thereof frcm overspray, and a spraying compartment attached to the mask and housing said spraying means.
• the spray booth may be provided with an extraction system thereby maintaining the inner surfaces of the mask free frcm powder build p.
• the mould mask is preferably interchangeable with other mould masks of different design thereby to suit any particular S.M.C. part.
• the spraying apparatus shown in the accompanying drawing comprises a spray booth 1 mounted in position above a male mould half 2 whose upper mould surface is to be powder coated..
• a plurality of spray guns 3 are mounted in line across the spray booth 1 and moved over the upper surface of the mould half 1 by a horizontal reciprocator 4.
• the spray is directed onto the surface of the mould half 2 through a mould mask 5 mounted to the bottom of the spray booth, the mask conforming to the outer contours of the moulding on the upper surface of the mould half 2 thereby to provide the required masking effect.
• the mask 5 is provi ' ded with -upwardly sloping sides 5' (thus avoiding contact with the mould half) which lead.to an extraction duct 6 surrounding the lower periphery of the spray booth 1. -
• the upwardly sloping sides 5' of the mask 5 lead from a peripheral lip or skirt 5* * -which in use overlaps the contour edge of the mould surface of the mould half 2 as shown. At least the peripheral lip 5' ' is formed of a heat resistant plastics.
• An extractor fan (not shown) is connected to the extraction duct 6 for drawing excess powder out of the spray booth 1 which collects around the masking area of the mask 5.
• the spray booth 1 is retractably mounted by means (not shown) so that it may be withdrawn frcm the mould half 2 after spraying and the mould half (2) shuttled to the press during the press cycle.
• the mask 5 is interchangeable to enable other masks to be inserted conforming to the shape of the S.M.C. part to be formed in the subsequent pressing process. — ⁇ -
• a pressing operation may be carried out using a press with a spraying apparatus as above described stationed to either side of the press.
• the female mould half is positioned in the press and corresponding male mould halves are shuttled between the press and the adjacent spraying apparatus.
• S.M.C. part moulding compound To form the S.M.C. part moulding compound is charged in the female mould half in the press, and a powder coated mould half is then -transferred frcm one spraying apparatus into the press and the mould is closed to form the S.M.C. part.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Coating Apparatus (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10529044

Family Applications (1)

Country Status (2)

Families Citing this family (9)

Family Cites Families (3)

• 1983
  • 1983-03-16 EP EP83901087A patent/EP0103619A1/de not_active Withdrawn
  • 1983-03-16 WO PCT/GB1983/000080 patent/WO1983003220A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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