WO1991008094A1 - Machine for impregnating fibrous reinforcing with binder - Google Patents

Machine for impregnating fibrous reinforcing with binder Download PDF

Info

Publication number
WO1991008094A1
WO1991008094A1 PCT/AU1990/000563 AU9000563W WO9108094A1 WO 1991008094 A1 WO1991008094 A1 WO 1991008094A1 AU 9000563 W AU9000563 W AU 9000563W WO 9108094 A1 WO9108094 A1 WO 9108094A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
fibres
suction
binder
liquid binder
Prior art date
Application number
PCT/AU1990/000563
Other languages
French (fr)
Inventor
Elmer Charles Marffy
Original Assignee
Elmer Charles Marffy
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 Elmer Charles Marffy filed Critical Elmer Charles Marffy
Publication of WO1991008094A1 publication Critical patent/WO1991008094A1/en

Links

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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
    • B29C70/021—Combinations of fibrous reinforcement and non-fibrous material
    • B29C70/025—Combinations of fibrous reinforcement and non-fibrous material with particular filler
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
    • B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
    • B29B15/10—Coating or impregnating independently of the moulding or shaping step
    • B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
    • B29B15/122—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex
    • B29B15/125—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex by dipping
    • 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
    • B29C37/006—Degassing moulding material or draining off gas during moulding
    • 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
    • B29K2105/0809—Fabrics
    • 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
    • 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
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles

Definitions

  • Reinforcing fibres in the form of matt and cloth are used to cover molds where they are impregnated with a liquid setting resin by hand.
  • a mechanised alternative exists in the form of a gun which chops up the fibres and sprays them on the mold together with a liquid resin. Howver, the product so obtained contains air bubles and its quality is below that obtainable by the manual method. Also, this mechanised method is not applicable for use with reinforcing cloth.
  • the manual method of impregnation is also lacking in many respects.
  • the product still contains some entrapped air, the quality of the product fluctuates according to the skill and application of the workmen and of course, the cost of hand labour is high.
  • This invention provides an alternative mechanised method of impregnation. For this it uses an adaptation of a machine known as the drum type of continous filter, altered as described below.
  • the process consists of two distinct phases, though performed without interruption.
  • the dry reinforcing matt or cloth is icked up by the perforated drum under suction.
  • i • carries the reinforing with it.
  • the d rum d ips int a tray containing the liquid binder where the suctio will replace air from in between the fi b res with th liquid binder from the tray.
  • the machin accomplishe d the effective removal of air an d the complet wetting out of the fibrous layer with the l iqui d b in d er.
  • the purpose of the second stage is to remove exces bin d er and deliver a product of uniform binder to reinfor cing ratio. This is accomplished by introducing a fil into t h e tray an d allow the drum with the now saturate reinforcing layer to pick up this film, upon the fil joining the layer already on the drum, the suctio in the drum will make the film press d own so as t squeeze out te excess binder into the drum.
  • the squeezin out process cannot go to excess because the reinforcin has little if any elasticity at the pressure impose b y the film. Therefore, the squeezing out process termi nates at a point which leaves a product of unifor degree of impegnation, depending only on the natur of the reinforcing used.
  • the final stage consists of the take-off point.
  • a blade or rod across the drum breaks the suction between the product and the drum and allows it to be removed.
  • the blade or rod has either attache d thereto, or placed adjacent to it a flexible sheet which extends from the take-off point to the resin
  • the film used in the second step may be an endless belt and thus part of the machine or a film intende d for a single use only and left on the wet product to aid in the removal of same.
  • the ancilliary machines required consist of a source of suction and a means for recycling the liquid binder from the inside of the perforated drum to the tray.
  • the process may be used also to build its own matt.
  • .chopped fibres are mixed with the liquid binder fed to the tray. Such fibres filter out on the perforated drum thus forming a layer of matt and may result in some savings in costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulding By Coating Moulds (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

A mechanical device for impregnating reinforcing fibres with a liquid binder using fibres in the form of matt or cloth fed to a perforated rotating drum under suction and dipped into the binder, or alternatively, by dispersing the fibres in the binder and so depositing the fibres on the drum by filtration to form a matt. In either case, the impregnated fibres on the drum are to be covered with a film to prevent entry of air and to remove excess resin by the effect of the suction in the drum.

Description

Title : - 1 -
MACHINE FOR IMPREGNATING FIBROUS REINFORCING WITH BINDER
This invention relates to the mechanical impregnation of reinforcing matt or woven cloth with liquid setting resins or other liquid binders.
Reinforcing fibres, in the form of matt and cloth are used to cover molds where they are impregnated with a liquid setting resin by hand. A mechanised alternative exists in the form of a gun which chops up the fibres and sprays them on the mold together with a liquid resin. Howver, the product so obtained contains air bubles and its quality is below that obtainable by the manual method. Also, this mechanised method is not applicable for use with reinforcing cloth.
The manual method of impregnation is also lacking in many respects. The product still contains some entrapped air, the quality of the product fluctuates according to the skill and application of the workmen and of course, the cost of hand labour is high.
This invention provides an alternative mechanised method of impregnation. For this it uses an adaptation of a machine known as the drum type of continous filter, altered as described below.
The process consists of two distinct phases, though performed without interruption. In the first stage, the dry reinforcing matt or cloth is icked up by the perforated drum under suction. As the drum turns, i •carries the reinforing with it. The drum dips int a tray containing the liquid binder where the suctio will replace air from in between the fibres with th liquid binder from the tray. At this stage, the machin accomplished the effective removal of air and the complet wetting out of the fibrous layer with the liquid binder.
The purpose of the second stage is to remove exces binder and deliver a product of uniform binder to reinfor cing ratio. This is accomplished by introducing a fil into the tray and allow the drum with the now saturate reinforcing layer to pick up this film, upon the fil joining the layer already on the drum, the suctio in the drum will make the film press down so as t squeeze out te excess binder into the drum. The squeezin out process cannot go to excess because the reinforcin has little if any elasticity at the pressure impose by the film. Therefore, the squeezing out process termi nates at a point which leaves a product of unifor degree of impegnation, depending only on the natur of the reinforcing used.
As the drum turns, the final stage consists of the take-off point. A blade or rod across the drum breaks the suction between the product and the drum and allows it to be removed. The blade or rod has either attached thereto, or placed adjacent to it a flexible sheet which extends from the take-off point to the resin
SUBSTITUTE SHEET tray and serves as a shield to prevent entry of air into the perforted drum.
With some fibres it is dificult to achieve a clean parting from the drum. In such cases a losely woven belt is placed around the drum and the blade or rod at the take-off point is placed between the drum and the belt. Once the suction is broken, the product parts from the belt with ease.
The film used in the second step may be an endless belt and thus part of the machine or a film intended for a single use only and left on the wet product to aid in the removal of same.
The ancilliary machines required consist of a source of suction and a means for recycling the liquid binder from the inside of the perforated drum to the tray.
The process may be used also to build its own matt. When used thus, .chopped fibres are mixed with the liquid binder fed to the tray. Such fibres filter out on the perforated drum thus forming a layer of matt and may result in some savings in costs.

Claims

CLAIMS - 4 -
1^. A machine consisting of a perforated drum under suction towhich isprovided a continous layer of reinforcin fibres in the form of matt or woven material. The rotating drum carries the fibrous layer and in the course of its rotation performs the following functions. The drum with the fibrous t material on it dips into a tray containing a liquid binder where the suction in the drum acting through the perforat ions acts to remove air from in between the fibres and replaces same with liquid binder. Whilst still submerged in the liquid binder, at a stage when the fibres are fully saturated a film joins the wet layer. Atmospheric pressure on the one side and the suction in the drum on the other side squeezes excess resin into the drum until th fibres prevent further removal of the binder. Finally, as the rotation of the drum completes the cycle, blade or rod brakesthe suction between the produc and the drum and the impregnated product is removed. The section of the drum which lies between the produc off-take and the beginning of the new cycle where th dry reinforcing meets the liquid binder • is covere with a sheet of flexible material to shield the perfora tions in the drum and so maintain suction in the drum.
2_. A machine as described in Claim No.l, but adde thereto a continous belt made from losely woven textil or wire and having a diameter slightly larger tha that of the perforated drum and placed thereon to carr the fibrous layer and to permit the placing of th blade or rod used for breaking the suction at the end of the cycle between such belt and the drum, so that the product can be lifted off the drum bymeans of such belt and so avoiding disturbance to the integrity of the product.
3. A machine as described in claim No.l, but supplied with chopped fibres mixed with the liquid binder in the tray in lieu of 'using a matt or woven cloth. The perforated drum under suction acts as a filter and results in the fibres building up on the drum forming a matt and is then covered with the film described in Claim No.l, the process proceeding thereafter in the same manner.
f SUBSTITUTE SHEET
PCT/AU1990/000563 1989-11-30 1990-11-23 Machine for impregnating fibrous reinforcing with binder WO1991008094A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ7634 1989-11-30
AUPJ763489 1989-11-30

Publications (1)

Publication Number Publication Date
WO1991008094A1 true WO1991008094A1 (en) 1991-06-13

Family

ID=3774389

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000563 WO1991008094A1 (en) 1989-11-30 1990-11-23 Machine for impregnating fibrous reinforcing with binder

Country Status (1)

Country Link
WO (1) WO1991008094A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533834A (en) * 1966-05-17 1970-10-13 Owens Corning Fiberglass Corp Method and apparatus for impregnating porous sheet material formed of fibrous material
US4288475A (en) * 1979-10-22 1981-09-08 Meeker Brian L Method and apparatus for impregnating a fibrous web
AU7013581A (en) * 1980-05-06 1981-11-12 Montedison S.P.A. Reinforced laminate
US4767643A (en) * 1986-07-22 1988-08-30 Westinghouse Electric Corp. Method of continuously vacuum impregnating fibrous sheet material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533834A (en) * 1966-05-17 1970-10-13 Owens Corning Fiberglass Corp Method and apparatus for impregnating porous sheet material formed of fibrous material
US4288475A (en) * 1979-10-22 1981-09-08 Meeker Brian L Method and apparatus for impregnating a fibrous web
AU7013581A (en) * 1980-05-06 1981-11-12 Montedison S.P.A. Reinforced laminate
US4767643A (en) * 1986-07-22 1988-08-30 Westinghouse Electric Corp. Method of continuously vacuum impregnating fibrous sheet material

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Perry's Chemical Engineers Handbook", Published in 1984, by MCGRAW-HILL BOOK COMPANY (New York), see page 19-79. *
J.E. KLINE, "Paper and Paperboard", Published 1982, by MILLER FREEMAN PUBLICATIONS, INC. (San Francisco), see pages 98, 108 and 128. *

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