EP0134218A1 - Agencement comprenant des composants plastiques renfermes a l'interieur d'une couverture et procede de production de l'agencement - Google Patents

Agencement comprenant des composants plastiques renfermes a l'interieur d'une couverture et procede de production de l'agencement

Info

Publication number
EP0134218A1
EP0134218A1 EP84900316A EP84900316A EP0134218A1 EP 0134218 A1 EP0134218 A1 EP 0134218A1 EP 84900316 A EP84900316 A EP 84900316A EP 84900316 A EP84900316 A EP 84900316A EP 0134218 A1 EP0134218 A1 EP 0134218A1
Authority
EP
European Patent Office
Prior art keywords
arrangement
reinforcement
cover
organs
components
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Withdrawn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
EP84900316A
Other languages
German (de)
English (en)
Inventor
Jan Christensen
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.)
Rovac AB
Original Assignee
Rovac AB
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 Rovac AB filed Critical Rovac AB
Publication of EP0134218A1 publication Critical patent/EP0134218A1/fr
Withdrawn legal-status Critical Current

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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/06—Making multilayered articles
    • 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
    • B29C37/0064—Degassing moulding material or draining off gas during moulding of reinforced material
    • 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
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • 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
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
    • 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
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/12—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of short length, e.g. in the form of a mat
    • 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
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • 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
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/542—Placing or positioning the reinforcement in a covering or packaging element before or during moulding, e.g. drawing in a sleeve

Definitions

  • Arrangement comprising plastic components enclosed in a cover and method of producing the arrangement.
  • the present invention relates to an arrangement which comprises plastic components which are incorporated in a foil-shaped cover, in essentially air-evacuated conditions, together with re-inforcement which are arranged so that in the cover they adopt a de-activated state in which a chemical process which causes the components to form a finish-reinforced plastics material is inhibited, and an activated condition which is brought about by means of initiation organs, e.g. organs which emit radiation, heat and/or force, by means of which the said process is initiated.
  • initiation organs e.g. organs which emit radiation, heat and/or force
  • SMC Sheet Moulding Compound
  • polyester mat PREPRES
  • themanufacturing process for the object or the addition is made relatively complex by the aforementioned cutting and weighing operations. Furthermore, the transport routes for the separated material in the. mould are long, and in the case where it is proposed to manufacture a reinforced product or similar, undesired fibre orientations may easily occur, which means that the finished product will not exhibit the desired strength. In addition, the SMC method requires the use of steel moulds which are labour-intensive and expensive to produce.
  • the problem outlined above can be solved by means of semi-finished products containing plastics and reinforcing material packed in portions in closely-fitting covers. In this way environmental requirements can be satisfied.
  • the content of fillers can be kept low and the orientation of the reinforcement in the plastics material is facilitated.
  • the wastage is also minimal.
  • the object of the present invention is to propose an arrangement and a method for executing the arrangement for solving at least the major proportion of the problem outlined in the above.
  • the feature which can be regarded as mainly characteristic of the new arrangement is that the plastics components and the reinforcement contained in the cover exhibit a residual air content which on average for the entire arrangement is 0.5 percent by volume or less.
  • One method or producing the new arrangement can essentially be regarded as being characterised by the fact that the plastics components and reinforcement are applied between the cover portions forming the said cover in a vacuum chamber which is subjected to a marked vacuum, e.g. 10-30 kPa (0.1-0.3 bar) or less and that the cover sections are sealed, preferably under vacuum, in order to form the arrangement.
  • the curing system employed in the arrangement is also specific and designed so that it can cope with a relatively long storage period and a relatively short forming period.
  • the reinforcement content in the arrangement is preferably made high.
  • the content of reinforcement 1-10 percent by weight, e.g. about 5 percent by weight, should exceed the content of reinforcement which is obtained with corresponding conventional methods which are undertaken mainly at atmospheric pressure.
  • a comparison can for example be made with spraying of polyester with cut glass fibres (roving) which is carried out under vacuum or at atmospheric pressure.
  • the unit is designed in such a way so that at least prior to activation and moulding it is essentially plane so that conditions can exist for uniform and rapid hardening, e.g. by means of IR radiation.
  • the external form of the unit can be determined with great accuracy in the course of the manufacture of the unit, which may be achieved by the use of a computer-controlled production process.
  • the plastic cover may be part of or may be separated from the unit on the occasion of its activation or its transformation into a finished product.
  • the unit may be executed with internal walls or internal pockets and/or may be provided with an inner unit which, for the purpose of separation, encloses those ingredients which are to form part of said chemical process when the unit is activated.
  • the unit may in certain cases be executed in such a way that it will, in its de-activated condition and for at least a pre-determined period after its activation, form what appears when viewed from the outside to be a soft and formable unit capable with great flexibility of being matched to different moulds to which it can adapt its shape or similar.
  • Said ingredients may, in the case of one embodiment, be enclosed inside a reinforced and preferably thin plastics laminate, which may be compressed by atmospheric pressure and possibly also by mechanical compressing organs so as to achieve a very high rate of elimination of air bubbles from the laminate.
  • Different units may also be allocated different ingredient compositions for the purpose of producing different characteristics in the finished plastics material in respect of its structure, for example its external structure, the level of entrapped air, its shrinkage characteristics and/or its strength, etc.
  • first units may be provided for a first application
  • second units may be provided for a second application, and so on.
  • the said method preferably continuous production of semi-finished products is arranged in a vacuum chamber.
  • Two continuous webs of foil are utilised here.
  • Plastics components and reinforcement in different continuous and discontinuous layers are applied to a lower foil web in such a way that a build up is obtained of the plastics material and reinforcement.
  • the upper foil web is brought into contact with the top face of the build up and the foil webs are joined together, e.g. by means of welding, gluing, etc. in order to form one or a plurality of arrangements, where in the case of a plurality of arrangements these are appropriately joined together.
  • the said compression or air expulsion organs can be arranged for interaction with the plastics material and reinforcement via one or via both foil webs.
  • the press roll concerned can be employed to remove an excess of the plastics component.
  • the new semi-finished product enables a very high degree of freedom from air bubbles to be achieved in the finished product, which offers special advantages amongst other things in conjunction with the manufacture of components which are subsequently to be subjected to surface treatment, e.g. painting at high temperature, when air bubbles would otherwise appear and cause local porosity in the material.
  • the unit may also be moulded in moulds which are much cheaper than those used, for example, for SMC materials.
  • the unit is particularly useful for enclosing ingredients which produce reinforced laminated products, as well as products with an extremely high level of reinforcement, for example up to 60% by weight and more of glass reinforcement.
  • Use may be made for this purpose, for example, of a peroxide system which is extremely stable under storage and which is activated by heat and/or infra red radiation, offering many advantages in this context. It is possible, amongst other things, particularly if the semi-finished product adopts a plane state on activation, to provide an efficient and rapid hardening process in which, amongst other things, the exotherm in the laminate is kept low.
  • the nature of the cover should preferably be specified such that it will not reflect any radiation, which means that very thin laminates can be produced which, in spite of this, exhibit extremely good resistance to stretching and bending compared with what could be achieved by earlier methods.
  • the unit may, if so desired, be moulded so as to exhibit extremely high flexibility over the desired contour.
  • Working with the mould is further simplified since the cover can be used as protection inside the mould so that no adhesion will occur between the laminate and the mould. There is thus no longer any need to clean, polish and wax the mould, which may be re-used directly to produce a new component once the finished component has left the mould. Thanks to the short hardening period and the minimum amount of work involved in laying-up and processing the mould, a significant reduction can be achieved in the duration of the production cycle compared with present methods.
  • the problem of shrinkage can also be controlled, thereby permitting the manufacture of products and coatings with small tolerances.
  • This also means that components which previously had to be produced from sheet and metal, for example within the automobile and marine industries, can now be produced either entirely or in part from plas tics.
  • This also means that much of the rust problem encountered, for instance, within the automobile industry can now be resolved, and that the noise level associated with the production of such compounds can be reduced.
  • the unit permits a very wide freedom of choice as regards the choice of moulding method for forming the finished pruduct.
  • the foil With the low friction on the outside of the cover, during moulding the foil can be more easily adapted to the desired mould contour, which can be rendered more intricate as a result of the low friction.
  • the manufacturing method described permits efficient production of semi-finished products with a number of different alternative reinforcements.
  • Figure 1 in perspective view seen from above and from the right illustrates an arrangement in the form of a semi-finished product and an identical arrangement which is joined to this and illustrated in part only.
  • Figure 2 illustrates in side view an arrangement in accordance with Figure 1 and organs for joining the lower and upper foils.
  • Figure 3 shows in vertical section the structure of and part of the manufacturing process of an arrangement in accordance with Figure 1-2
  • Figure 4 shows in diagrammatic form a production line for an arrangement as shown in Figures 1 and 2.
  • Figure 1 shows two units 1 and 2 applied to a base U, said units being joined together by means of a connecting piece 3 and 4 along one edge of each unit.
  • the units may also be separate or connected to other units.
  • Each unit is represented as a polygon, in particular as a square or rectangular unit having a length L, a width 8 and a thickness H.
  • the unit may, however, be tailor-made (pre-moulded) for any application and may accordingly exhibit other shapes depending on the intended application.
  • Each unit comprises a thin (e.g. 0.02 - 0.2 mm) cover of plastics material, referred to here as a cover (5) in the form of plastic sheeting, and ingredients 6 contained inside the plastic cover and so arranged that, with the unit in its storage or transport position, they do not take part in a mutual chemical reaction for the purpose of producing a finished plastics material, and that, with the unit in an activation and utilization position initiated by means of an activation process, they take part in said chemical reaction.
  • a cover (5) in the form of plastic sheeting
  • each, unit When viewed from the outside, each, unit may in certain cases be executed in a soft and mouldable form and in other cases in a more or less rigid form which will depend, amongst other things, on the viscosity of the enclosed ingredients and on any reinforcement.
  • the plastic cover 5 encloses the ingredients 6 in an essentially air-evacuated condition.
  • the type of the plastic cover may vary depending on whether the cover is to be included as part of the finished plastics material or is to be used as a means of protection in, amongst other things, moulds which will possibly be used for the final moulding of and/or for combination with some other part of the unit.
  • the cover which, as a general rule, will be wished to be flexible, may be selected from amongst the following groups of materials, for example: the polyolefins, the polyamides, the polyesters or the flouri ⁇ ated vinyl polymers.
  • the plastic cover is joined together (welded) around its outside edges, of which 3, 3a and 3b are shown here.
  • the plastic sheet must be capable of being stuck or welded and must as a rule be capable or being stretched and must exhibit low permeability by liquid ingredients.
  • the plastic cover may in a typical embodiment be executed with barrier walls and pockets for the purpose of forming various spaces inside the unit. This will enable different ingredients to be kept separate inside the various spaces.
  • a barrier wall of this kind is indicated by means of a broken line as the reference designation 7 .
  • the plastic cover itself may also be double, whereby the first (outer) plastic cover is given a first characteristic and the second (inner) plastic cover is given a second characteristic.
  • Each unit is a geometrical fit with, or can be made to fit the shape of the object or the addition to said object which the unit is to form.
  • the edge 3a may be welded or stuck together in a previously disclosed manner using previously disclosed welding or sticking organs S.
  • the quantity of material which the unit represents or includes is in itself sufficient to form the object or the addition. It will be necessary to waste only a small amount of material.
  • the distribution of the ingredients inside the unit is provided (controlled) preferably at an Optimum level in the course of manufacture, which is also true of the composition of the ingredients. It is possible in this way, for example, to place reinforcements in their precise positions inside the unit, which is thus able to exhibit first parts with a first ingredient composition and second parts with a second ingredient composition. This is true in the horizontal and in the vertical plane.
  • Figure 3 illustrates a more detailed example of the construction and manufacture of the unit.
  • the unit should preferably be produced inside a chamber at a pressure below atmospheric pressure, for example about 10-30 kpa or below.
  • a lower track for the plastic sheet is indicated by the reference designation 8 and an upper track for the plastic sheet by the reference designation 9 .
  • On the lower track are applied in a pre-determined sequence and quantity various plastic laminate components 10, 11, 12, 13 and 14 .
  • the layers 10 and 14 may thus constitute the outer layer closest to the lower and the upper track respectively.
  • the layers 11 and 13 consist of a mixture of polyester and glass, said mixture possibly consisting of, for example,30% by weight polyester and 70% by weight glass fibre reinforcement.
  • the layer 12 is in the form of a continuous sheet of a continuous or possibly braided glass fibre bundle (roving).
  • the tracks for the plastic sheet with the component parts laid upon them are assumed to move in the direction of the arrow 17 and the output from the compression organs 16, 16a takes place in the direction of the arrow 18.
  • the upper track for the plastic sheet is fed in the direction of the arrow 19.
  • air bubbles 20 Prior to passing through the rollers 15, 15a , air bubbles 20 are assumed to be present in this case at a pressure of about 5 kpa. Tie air bubbles are expelled gradually by the mechanical compression applied by the rollers 15, 15a and 16, 16a to the laminate, and the resulting total compression force F applied by the rollers is assumed to be of an order of magnitude to provide compression of about 100 kpa.
  • the unit 1' compressed in this way is assumed to be fed directly from the chamber into the conditions of atmospheric pressure indicated by F' , thereby producing a compression force of about 100 kpa on the outside of the unit.
  • the sheet is assumed to be welded, for example by hot welding, along its lateral edges; see the welds 3, 3a in Figure 1. The welding can take place preferably continuously as the manufacturing process progresses.
  • the atmospheric pressure causes the unit to retain the form given to it by the compressing organs inside the low-pressure chamber, and is thus prevented from increasing in thickness as a result of the stiffness of the glass fibre in the layers 11 and 13 and the layer 12 inside the unit.
  • the laminate inside the unit 1' is assumed in this case to have a curing system which remains highly stable during storage and which is activated by thermal radiation or infra red radiation, which may thus be utilized for the activation of the unit.
  • the unit 1' in its continuous form is conveyed to a cutting station (not shown) in which the length. L , the width B and the thickness H are determined (see Figure 1).
  • the quantity and the characteristics of the laminate may also be determined with great accuracy during manufacture.
  • FIG 4 illustrates a typical example of the construction of the equipment for producing the unit, for example in accordance with the Figure.
  • the sheet feed equipment and the material application equipment is arranged at different stations. From the station 21 the sheet web 8' is fed from a drum 21a which rotates in the direction of the arrow 21b (anti-clockwise).
  • the sheet shall, if necessary, be flexible and shall have a width which is dependent on the desired width B of the product. In the case illustrated the sheet shall be resistant to polyester products and epoxy products. The rate of feed is dependent on the production capacity.
  • At station 22 is applied by means of application organs, for example in the form of spray organs 22a a surface coating, for example in the form of a modified gel-coat 22b exhibiting such high viscosity as to prevent the glass fibre from penetrating downwards into the surface coating 22b . It is possible in this way to prevent fibre marks appearing on the product. In order further to counteract the latter, it is also possible to build up said surface coating with a layer of mat, for example 150 g/m 2 or finer, applied to the surface. The glass fibre will then float on the top of this layer. A two-component epoxy or polyurethane may be used in place of the gel-coat.
  • a roller rotating with the sheet may be used in place of the spraying equipment, thereby eliminating the viscosity factor and the problem of the spray pattern.
  • the aforementioned surface coating may also be omitted from many products, since it is often preferable to apply the paint at a late stage in the manufacturing process.
  • any desired number of previously disclosed laminating machines arranged in sequence.
  • a laminating machine 23a with its associated cutter organ 23b.
  • Production capacity will be dependent on the number of laminating machines, the intention being that capacity can be increased by the use of an increased number of laminating machines.
  • the pistol/cutter inside the chamber 23 may be replaced by a roller for the glass fibre mat. Additional moistening with polyester at a subsequent station 25 will then be necessary.
  • the percentage of glass fibre added at the station 23 may be selected within a wide range, for example within the range 20-80% by weight (stretched roving).
  • a continuous supply of the reinforcement bundle or the roving reinforcement 12' is provided at the station 24 , the presence of said layer being extremely important in order to increase the resistance of the laminate to stretching and bending.
  • the actual positioning of the reinfocement in the laminate is of great significance in this respect.
  • the application of continuous roving may take place using an ordinary cutter 24a without knives.
  • the cutter unit may describe an oscillating movement over a distance of about 15 cm. By running at the same speed in m/sec as the speed of the sheet base, it is possible to produce a roving layer having identical characteristics to those of the continuous reinforcement fibres.
  • any necessary foam plastic 25a via spraying organs 25b .
  • This station may, if necessary, be omitted.
  • a spray pistol 25a' for the spray-application of. polyester 25b' in order to provide moistening of the roving layer.
  • the station 26 has a similar function and is of similar construction to the station 23 .
  • the station 27 has an identical function and is of identical design to the station 22
  • the station 28 is of similar design to the station 21 , whereby the upper sheet web 9' is fed from the latter station 28 .
  • At the station 29 any superfluous sheet is cut away at the same time as the units themselves are cut to size and sealed by welding by means of symbolically represented organs 29a .
  • compression station 30 compression takes place with the help of transverse rollers 30a which are forced against the units at a uniform loading.
  • the speed of the rollers is synchronized with the rate of advance of the sheet.
  • the number of rollers in use will depend on the percentage of glass fibre reinforcement and the viscosity of the polyester/epoxy material.
  • Hardening and moulding of semi-finished products produced in this way can take place in a known manner, inter alia see the said European Patent Specification.
  • hardening can occur by means of infra-red radiation which can penetrate the laminate without being reflected at the foil surface.
  • Complete hardening can then be achieved with extremely thin laminates, e.g. laminates which provide finished products with a material thickness of 1-5 mm, which is advantageous inter alia in the automobile industry.
  • the arrangement is activated preferably in the plane condition. It is also possible to employ organs which emit heat and/or force.
  • the laminate combinations can be programmed in a computer system 46 for production memeposes.
  • the links to the respective station are denoted by 47 and 48.
  • Figure 3 which illustrates the equipment inside the vacuum chamber U
  • air compression organs 15', 15" can be empbyed in a position which is located in front of the point where the foil 9 is brought into contact with the top side of the laminate 11, 12, 13.
  • the organ 15' interacts directly with the laminate layer 13 and the organ 15" with the lower side of the foil 8.
  • the organs 15', 15" can be employed to remove any excess of plastics material.
  • With the mechanical rolls illustrated it is possible for an increased content of reinforcement to be provided in the manufactured semifinished product. Furthermore, the air content is further reduced.
  • the vacuum chamber can be of a known type provided with air evacuation equipment and an output lock for discharge of the final semi-finished product.
  • the sealing of the foil occurs preferably under vacuum, e.g. the same vacuum (0.1 -0.3 bar) under which application of the material takes place. If output locks are employed, sealing can alternatively take place under reduced vacuum, e.g. about 0.5 bar. It is also feasible to undertake sealing at atmospheric pressure.
  • sealing can take place in or outside the chamber, or alternatively in the lock appertaining thereto.
  • the arrangement produced in accordance with the above has an extremely low residual air content. Values of about 0.2-0.3 percent by volume can on average be obtained for the entire arrangement.
  • the frictional properties of the entire exterior or part of the exterior of the cover can be reduced by means of lubricants or by the choice of foil having a low coefficent of friction.
  • a curing system be employed in the plastics material for curing this, which on the one hand will permit a storage time for the semi-finished product of at least one month, and secondly a moulding period of not more than 30 minutes.
  • the unit is produced in substantially air evacuated condition. Then, the atmospheric pressure will contribute on the produced unit to an increased friction i.a. between the fibres in the unit. In such a way, the viscosity inside the unite will (apart from the reinforcement fibres) be kept to values below 10 Ns/m 2 , preferably below 9 Ns/m 2 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Moulding By Coating Moulds (AREA)
  • Reinforced Plastic Materials (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Cookers (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Un agencement (1) comprend des composants plastiques (6) qui sont contenus à l'intérieur d'une couverture en forme de feuille (5) avec un renforcement (7). Essentiellement tout l'air présent est évacué de la couverture. Pendant la fabrication les composants plastiques adoptent un état désactivé, dans lequel tout processus chimique où les composants forment un matériau plastique renforcé fini est inhibé. Grâce à des organes initiateurs, les composants plastiques peuvent également être amenés dans un état activé, dans lequel ledit processus est déclenché. Les composants plastiques et le renforcement présentent une teneur en air résiduel qui est en moyenne inférieure à 0,5 % environ en volume pour tout l'agencement. Les composants plastiques et le renforcement sont appliqués entre les parties formant la couverture dans une chambre sous vide poussé. Les composants de couverture sont scellés, de préférence sous vide, afin de former l'agencement, qui est successivement sorti de la chambre et exposé à la pression atmosphérique ambiante. L'agencement possède une teneur relativement élevée de renforcement, peut être activé de préférence à l'état plan et présente une longue durée de stockage intrinsèque à la température ambiante.
EP84900316A 1982-12-23 1983-12-14 Agencement comprenant des composants plastiques renfermes a l'interieur d'une couverture et procede de production de l'agencement Withdrawn EP0134218A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8207378 1982-12-23
SE8207378 1982-12-23

Publications (1)

Publication Number Publication Date
EP0134218A1 true EP0134218A1 (fr) 1985-03-20

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP84900317A Withdrawn EP0131015A1 (fr) 1982-12-23 1983-12-14 Agencement comprenant des ingredients plastiques et un renforcement
EP84900316A Withdrawn EP0134218A1 (fr) 1982-12-23 1983-12-14 Agencement comprenant des composants plastiques renfermes a l'interieur d'une couverture et procede de production de l'agencement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP84900317A Withdrawn EP0131015A1 (fr) 1982-12-23 1983-12-14 Agencement comprenant des ingredients plastiques et un renforcement

Country Status (11)

Country Link
EP (2) EP0131015A1 (fr)
JP (2) JPS60500440A (fr)
KR (1) KR840006930A (fr)
ES (1) ES285338Y (fr)
FI (1) FI843318A0 (fr)
IL (1) IL70501A0 (fr)
IT (2) IT1170063B (fr)
NO (1) NO842890L (fr)
OA (1) OA07785A (fr)
WO (2) WO1984002491A1 (fr)
ZA (1) ZA839492B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0549110A1 (fr) * 1991-12-23 1993-06-30 Ford Motor Company Limited Procédé de fabrication d'articles renforcés de fibres
DE19814039A1 (de) * 1998-03-30 1999-10-07 Koegel Fahrzeugwerke Ag Sandwichelemente aus Kunststoff-Deckschichten und einem Kern zur Herstellung mobiler, temperaturgeführter Container
EP1156080A1 (fr) * 2000-05-15 2001-11-21 Atofina Feuille multicouche coextrudée comprenant deux couches extérieures en polyamide ou alliage polyamide/polyoléfine et couche centrale en polyoléfine ou polyamide ou alliage polyamide/polyoléfine
KR100537761B1 (ko) * 2002-10-25 2005-12-19 김수웅 거푸집용 코팅합판의 제조방법
EP1724098A1 (fr) 2005-05-20 2006-11-22 Carbo Tech Composites GmbH Procédé de fabrication d'un produit laminé composite et produit composite fabriqué par le procédé de lamination
EP2676780B1 (fr) * 2012-06-18 2017-08-02 Technische Universität Dresden Procédé de fabrication d'un semi-produit multi-couches
JP6098483B2 (ja) * 2013-11-13 2017-03-22 トヨタ自動車株式会社 繊維強化樹脂材の製造方法
JP7064084B2 (ja) 2017-02-08 2022-05-10 サイテック エンジニアード マテリアルズ リミテッド 複合材料の二重ダイアフラム成形、そのような成形のためのアセンブリ、及び結果として得られる複合材料

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA575881A (fr) * 1959-05-12 Scovill Manufacturing Company Soupape de retenue
US2588493A (en) * 1947-09-16 1952-03-11 Stefano John De Valve for stems of pneumatic tires
GB890304A (en) * 1959-07-23 1962-02-28 British Transp Commission Improvements relating to boards of resin-impregnated material
US3040764A (en) * 1960-07-20 1962-06-26 Alan R Feinberg Temperature and pressure relief valve
BE607271A (fr) * 1960-08-17
GB2051655A (en) * 1979-03-30 1981-01-21 Storey Brothers & Co Method of making a shaped structure
AU532845B2 (en) * 1979-11-20 1983-10-13 Albert Fradin Moulding slow setting material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8402490A1 *

Also Published As

Publication number Publication date
IT1170064B (it) 1987-06-03
WO1984002490A1 (fr) 1984-07-05
ES285338U (es) 1986-04-16
JPS60500440A (ja) 1985-04-04
EP0131015A1 (fr) 1985-01-16
FI843318A (fi) 1984-08-22
WO1984002491A1 (fr) 1984-07-05
FI843318A0 (fi) 1984-08-22
KR840006930A (ko) 1984-12-04
NO842890L (no) 1984-07-13
ZA839492B (en) 1984-08-29
IT1170063B (it) 1987-06-03
ES285338Y (es) 1986-12-01
JPS60500284A (ja) 1985-03-07
IL70501A0 (en) 1984-03-30
IT8324380A0 (it) 1983-12-23
OA07785A (en) 1986-11-20
IT8324381A0 (it) 1983-12-23

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