WO2004071739A1 - Installation de production d'articles faits de materiau plastique, procede associe et articles obtenus - Google Patents

Installation de production d'articles faits de materiau plastique, procede associe et articles obtenus Download PDF

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Publication number
WO2004071739A1
WO2004071739A1 PCT/IB2004/000359 IB2004000359W WO2004071739A1 WO 2004071739 A1 WO2004071739 A1 WO 2004071739A1 IB 2004000359 W IB2004000359 W IB 2004000359W WO 2004071739 A1 WO2004071739 A1 WO 2004071739A1
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WO
WIPO (PCT)
Prior art keywords
film
mold
segment
transport plane
plant
Prior art date
Application number
PCT/IB2004/000359
Other languages
English (en)
Inventor
Mario Damo
Original Assignee
G.M.P. Spa
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 G.M.P. Spa filed Critical G.M.P. Spa
Publication of WO2004071739A1 publication Critical patent/WO2004071739A1/fr

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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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14008—Inserting articles into the mould
    • 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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/008—Handling preformed parts, e.g. inserts
    • 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
    • B29C37/0003—Discharging moulded articles from the mould
    • B29C37/0007—Discharging moulded articles from the mould using means operable from outside the mould for moving between mould parts, e.g. robots
    • B29C37/001—Discharging moulded articles from the mould using means operable from outside the mould for moving between mould parts, e.g. robots combined with means for loading preforms to be moulded or inserts, e.g. preformed layers
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0084—General arrangement or lay-out of plants
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/261—Handling means, e.g. transfer means, feeding means
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
    • 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
    • B29C2037/0042—In-mould coating, e.g. by introducing the coating material into the mould after forming the article the coating being applied in solid sheet form, e.g. as meltable sheet
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14237—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14237—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
    • B29C2045/14245—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity using deforming or preforming means outside the mould cavity
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps

Definitions

  • the present invention concerns a plant for the production of articles made of plastic material of the type consisting of at least two components that react when mixed, for example during the injection and/or molding step using R.I.M. (Reaction Injection Molding) technology.
  • the following description refers to polyurethane as an example of such plastic materials, but it comes within the field of the invention to use any plastic material having such characteristics, for example dicyclopentadine or other similar or comparable material.
  • the articles of plastic material to which the invention refers are covered with at least a thermoplastic film, possibly pigmented, and having a decorative and/or protective function.
  • the articles obtained according to the invention are relatively large and consist, for example, of panels, doors, wings or similar, with high aesthetic characteristics and including, or not, undercuts, inlays or handles .
  • Known methods for the production of articles made of plastic material with at least two components using the R.I.M. technology differ from each other mainly according to the technique used for the surface finishing of the article obtained.
  • a first solution provides to make the article in a mold, remove it, and then subject it to a completion step that comprises at least trimming, surfacing, sanding and painting operations.
  • This technique is very laborious, does not give satisfactory and repeatable results with acceptable levels of standardization, and requires a high use of manpower and long execution times.
  • it limits the possibility of automating the production process and entails the need for purifiers and ventilators, particularly in the sanding and painting steps.
  • the process is in itself slow and discontinuous because it is impossible to exploit a great part of the equipment during the time required for the plastic material to polymerize inside the mold.
  • a second finishing technique provides to apply a covering and protective film in the mold, wherein the film is both heated and also thermoformed in the mold in succession.
  • This technique has a disadvantage because it is necessary to wait a relatively long time until the decorative film can be taken to the temperature suitable for thermoforming .
  • it has considerable difficulties in ensuring a homogeneous heating over the surface of the film.
  • the time needed to heat the film is added to the time needed for thermoforming, since it is not possible to even partly superimpose these two different operations performed by the same molding apparatus . Since the heating of the film is achieved by the punch of the mold, low calorific yields of heat transmission are obtained, since the punch cannot exceed the ideal polymerization temperature of the material. This also puts limits on the types of materials that can be used, both plastic for the article and thermoplastic for the film.
  • US-B-6.379.606 describes a thermoforming method wherein two pieces molded separately are fused and joined together, with a rotating table which moves the pieces between various working stations, in each of which one step of the cycle is carried out.
  • This document does not refer to the production of polyurethane articles covered with a thermoplastic film which is heated before it is introduced into the elements of the mold, and therefore it deals not with the problems connected with transporting, retaining, pre-heating and pre-forming the film, with introducing the material inside the mold, with discharging the article, etc.
  • US-A-5.800.771 which is the most pertinent state of the art, concerns a method to mold an article made of resin covered by a film that, before being introduced into the mold, is heated by a transport table.
  • this document does not provide means inserted inside the mold which collaborate in the operations to position the film, and to mold and discharge the article.
  • the purpose of the invention is to achieve a plant suitable to produce in repetitive manner, with limited costs and times, with high and standardized quality and with a great automation of a large part of the operating steps, articles made of plastic material covered on at least one side with at least a decorative film.
  • Another purpose is to achieve a compact plant, of limited size and complete with accessory elements to perform all the operations connected to the finishing and completion of the work processes on the article.
  • Another purpose is to achieve a plant wherein the production times are optimized, eliminating pauses and waiting times as much as possible, and allowing a great automation of the entire process.
  • a further purpose is to make the operations to change both the form of the article, changing at least part of the elements of the mold, and also the color and format of the decorative film easy, quick and able to be automated, without requiring complex operations of dis-assembly and re-assembly of parts, nor particular use of manpower.
  • the plant according to the present invention comprises a plurality of molding apparatuses, able to work in parallel, and each comprising at least:
  • Each molding apparatus also comprises first automated transport means that pick up, and possibly heat and preform, the segment of film during its transfer from the laying and cutting zone until it is positioned in a relative mold element.
  • the first automated transport means are of the type with a heating plane and include means to grip, retain and preform the segment of film to prevent it from deforming, due to the fact that it is very thin, during the heating step.
  • Said heating plane means are able to move, positioning themselves on each occasion, from the zone, wherein the segment of film is laid onto a work plane and cut to size, as far as inside the press element, and to rest on a relative mold element to transfer thereto the heated, and possibly pre-formed, segment of film.
  • the heating plane means cooperate with the relative mold element, during the thermoforming step performed in the mold, clamping the segment of film on the perimeter and exerting thereon a retaining function.
  • the heating of the film is obtained using heating means located outside the transport plane, for example heating lamps, such as infra-red, ultra- violet or other suitable type, with which the automated transport means are taken to temporarily cooperate.
  • heating means located outside the transport plane for example heating lamps, such as infra-red, ultra- violet or other suitable type, with which the automated transport means are taken to temporarily cooperate.
  • the transport plane is not heated, or is heated only partly.
  • the laying, cutting, heating and pre-forming of the segment of film performed outside the mold serve on the one hand to reduce the times necessary for the thermoforming of the segment of film inside the mold, and on the other hand allow to exploit the polymerization times of the plastic material after it has been injected into the mold. In this way, in the subsequent cycle, the segment of film is introduced into the mold already hot without the required heating and polymerization times being added entirely together in the cycle time.
  • the heating performed outside the mold allows to make the temperature at which the film is heated independent from the temperature of the mold elements, which corresponds to the ideal polymerization temperature of the plastic material. This allows to use materials for the film that cannot be used in traditional apparatuses that heat the film inside the mold. Furthermore, the heating of the film is not limited by the geometry of the punch and therefore can be optimized according to the type and format of the film used.
  • each production apparatus comprises ring nut means movable between, and able to be positioned in, a first position outside and a second position inside the press element and at least partly superimposed over a mold element in order to cooperate with the latter at least during the molding of the article.
  • the ring nut element when polymerization and molding are complete, the ring nut element is able to be taken outside the press element in order to discharge the article and transfer it to an autonomous unloading position.
  • the unloading position to unload the article is located in proximity with the position where the segment of film is laid and cut, but is separated therefrom so as to preserve the segment of film from contamination of dust or other dirt that can cause a deterioration in quality and wasted production.
  • the zone where the segment of film is laid and cut consists of a substantially closed environment in order to prevent infiltrations of dust and dirt, and inside there is at least a suction/ventilation system to keep the ambient air constantly clean.
  • the segment of film is subjected to the action of at least an ionizing bar that neutralizes any possible electrostatic charge that might have accumulated and prevents the film from attracting particles of dust and other dirt.
  • every molding apparatus there is at least an automated device suitable to make the mold-change operations when it is necessary to change the figure of the article to be made.
  • - fig. 1 shows a plane view of a plant for the production of articles according to the present invention comprising four molding apparatuses arranged in parallel;
  • - fig. 2 shows a longitudinal section of a molding apparatus of the plant in fig. 1;
  • - fig. 3a shows a transverse section of the plant in fig.
  • - fig. 3b shows an enlarged detail of fig. 3a; - figs. 4a to 41 show the production cycle of articles in the plant in fig. 1.
  • the reference number 10 denotes generally a plant for the production of articles 37 made of plastic material, for example polyurethane material or suchlike, consisting of a plurality, in this case four, of molding apparatuses 50 operating in parallel.
  • Each apparatus 50 comprises a press element 11 suitable to support and move relative mold elements consisting, in this case, of a female part 13, or matrix, and a male part 12, or punch.
  • the press element 11 can be driven to open/close by means of a movement actuator 30, according to the specific steps of the operating cycle. It comes within the field of the invention that the mold elements can have two or more impressions, and that the punch 12 can be replaced by another matrix or other similar or comparable element.
  • the punch 12 in this case in a substantially central position, has an injection channel 17, associated with an injection head 117.
  • an injection channel 17 associated with an injection head 117.
  • a mixture is injected of at least two components so that they react, in successive steps, inside a molding cavity 28 (fig. 4f) defined between the punch 12 and the matrix 13 until they are consolidated.
  • the injection channel 17 could be located in a non-central position, or there could be two or more injection channels, possibly usable alternately.
  • each apparatus 50 comprises feed reel means 20 able to feed a thermoformable and decorative covering film 19, which is made to adhere through thermoforming, as explained in more detail hereafter, to the inner wall of the matrix 13.
  • the feed reel means 20 are arranged in a preparation zone, located laterally to a relative press element 11, and are able to cooperate with a laying and cutting assembly 36 comprising laying means 38a and cutting means 38b able to prepare a segment of film 19 on a work plane 31.
  • the film 19 is made of thermoplastic material, advantageously has a pigmented surface and, normally, a thickness of between 0.2 and 1.4 mm, but it can also be as much as 3 mm and more.
  • Each apparatus 50 also comprises a transport plane 15, which can also be a heating plane, movable between a first position outside the press element 11 and a second position wherein it is taken to rest on the matrix 13, in order to locate and transfer thereon a segment of said film 19 that has been cut to size.
  • the function of the transport plane 15 is also to perform a pre-forming, for example upwards, of the segment of film 19 outside the mold, and then to transport said segment of film 19 inside the mold, while it heats it, so that thermoforming can be completed on the matrix 13.
  • the transport plane 15 does not have a heating function, and the film 19 is heated before it is introduced into the mold by external means, for example infra-red lamps or suchlike, with which the transport plane 15 is taken to temporarily cooperate.
  • the transport plane 15 cooperates with a mold element during the thermoforming step too, in order to exert a retention function on the perimeter of the segment of film.
  • the apparatus 50 also comprises an annular ring nut 22, of the type movable between the zone where the film 19 is prepared and a relative molding apparatus 50.
  • the zone where the film 19 is prepared is located in proximity with, in this case above, the zone where, once molding is complete, the article 37 is discharged and unloaded by means of the movable ring nut 22.
  • the zone where the film 19 is prepared and the zone where the article 37 is discharged are physically separated from each other, however, by means of the work plane 31.
  • This physical separation of the two zones brings the advantage that all the detritus, flashes, dust and other dirt generated during the removal of the article 37 from the ring nut 22 do not contaminate the area above the work plane 31, where the film 19 is laid and where there is the transport plane 15.
  • we prevent this dirt from being attracted by the electrostatic loads of the film 19, creating wasted production in subsequent cycles, with obvious advantages both in economic terms and in the quality of the finished product.
  • the feed reel means 20 and the work plane 31 are arranged inside a substantially closed environment 46 defined by a cover 49 and including suction means 42, filtration means 43 and means 44 to deliver air.
  • suction means 42, filtration means 43 and means 44 to deliver air.
  • ionizing bars 45 that act on the exposed surface or surfaces of the film 19 to neutralize any accumulated electric loads, which can attract residues of dust or suchlike.
  • the annular ring nut 22 not only has a function of discharging the article 37 but also, when it is resting on the matrix 13, of providing a supporting surface for the transport plane 15 during the transfer and forming of the segment of film 19, and of collaborating with the matrix 13 during the molding step, for example to achieve specific undercuts and perimeter profiles in the article 37.
  • the article 37 can be discharged from the mold in a substantially finished form that only needs the perimeter trimming of the excess film 19.
  • the annular ring nut 22 is moved, in coordination or not with the transport plane 15, to insert and form the film 19 in the mold and then, as explained, to discharge the article 37 from the mold.
  • the plant 10 also comprises discharge means 35 able to discharge the article 37 from the ring nut 22; said discharge means 35, as explained, are arranged substantially in the zone where the film is laid and cut, below the work plane 31.
  • the transport plane 15 which in the embodiment shown also functions as a heating plane, comprises a bearing structure 16 on which a replaceable frame 41 is mounted to grip and pre-form the film 19.
  • a heating element is mounted on the structure 16, for example with a sheet-type electric resistance, and also an insulating element and means able to create a vacuum according to temporal modes that can be selected depending on the step of the cycle in progress.
  • the movement means that cause the movement of the transport plane 15 can also be of the robotized type and allow to transport and handle the transport plane 15, with the segment of film 19, to any position whatsoever and with any orientation in space whatsoever.
  • the movement means displace the transport plane 15 from its first position outside the mold to its second position inside the mold and vice versa, as described hereafter.
  • the frame 41 is provided with anchoring means to anchor, at least temporarily, the film 19 to the frame 41; it also has vacuum means, specific or unified, with the following functions:
  • the plant 10 also comprises, on one side of the press elements 11, a mold-change carriage 21 cooperating with a store 39 where molds are deposited.
  • the mold-change carriage 21 is driven to replace the mold elements, matrix 13 and/or punch 12 and/or ring nut 22, of each of the molding apparatuses 50, when the product is changed.
  • the replacement mold elements are arranged on the store 39 and are picked up by the mold-change carriage 21 to be selectively located in a position adjacent to the molding apparatus 50 involved in the replacement.
  • the ring nut 22 and the transport plane 15 are in a position outside the mold and in proximity with the feed reel means 20 that feeds the film 19.
  • the transport plane 15 is above the work plane 31, has already picked up a relative segment of film 19, previously unwound from the feed reel means 20 by the means 38a and cut by the means 38b, and is heating it; the ring nut 22 is below the work plane 31 and has just discharged a molded article 37.
  • the second step (fig. 4b) provides that the transport plane 15 and the ring nut 22 translate on a substantially horizontal plane and are positioned between the matrix 13 and the punch 12. Then (fig. 4c), the ring nut 22 is taken to rest on, and couple with, the perimeter of the matrix 13 and the transport plane 15, with the film 19, is taken to rest on the ring nut 22. Subsequently the thermoforming of the film 19 is started, during which the transport plane 15, thanks to its vacuum means, exerts an action to retain the perimeter of the film between itself and the ring nut 22.
  • the laying and cutting assembly 36 can already prepare a new segment of film 19 on the work plane 31, thus reducing the cycle times .
  • the transport plane 15 is raised (fig. 4d) and then discharged from the mold; during this step the vacuum means of the transport plane 15 and the ring nut 22 are selectively, released and activated to perform the transfer of the film 19 while it is gripped on the ring nut 22 and the matrix 13.
  • the vacuum means of the transport plane 15 and the ring nut 22 are selectively, released and activated to perform the transfer of the film 19 while it is gripped on the ring nut 22 and the matrix 13.
  • the transport plane 15 returns to the laying and cutting zone (fig. 4e) , above the work plane 31 where the new segment of film 19 is ready.
  • the transport plane 15 can be lowered to pick up the new segment of film 19 in order to start heating and pre-forming it.
  • the press element 11 closes, taking the punch 12 onto the matrix 13, and the injection of the plastic material into the molding cavity 28 is started, thanks to the injection head 117.
  • the mold remains closed for the time needed to complete the polymerization reaction.
  • the heat and pressure generated during polymerization complete the thermoforming of the film 19, which is definitively and stably attached to the outer surface of the plastic material that is in consolidation phase.
  • the time required for polymerization is in any case used both for laying and cutting, on the work plane 31, a segment of film 19 to be used in the subsequent cycle, and also for heating said film by the transport plane 15; this leads to a considerable reduction of the overall times needed to complete the cycle.
  • the mold is opened and the annular ring nut 22 is first raised (fig. 4g) , and then translated laterally to its initial position, below the work plane 31, taking with it the article 37 (fig. 4h) that remains resting on said ring nut 22 due to the presence of the perimeter edge of the excess film 19. In this position the molded article 37 can be extracted and removed, by means of the discharge means 35 (figs. 4i, 41) .
  • the new cycle can restart automatically from this moment, substantially without a pause, given the proximity of the position of the ring nut 22 and the transport plane 15, while the operator, in safety, can pick up the article 37 to send it to a trimming station where the perimeter of the film 19 can be trimmed, in order to complete the process and obtain the finished piece.
  • the carriage 21 When the mold has to be changed, the carriage 21 is driven and translates with respect to the store 39 in order to pick up the replacement element; then it moves in front of the molding apparatus 50 involved in the replacement.
  • a single press element 11 can comprise not only two or more impressions, but also two or more simultaneously driven molds.
  • An automatic reel-change apparatus 20 can be arranged in the preparation zone in order to replace empty reels and/or to change the color of the film.
  • Ionizing bars 45 can be arranged also outside the environment 46 and as far as in proximity with the press element 11.
  • the discharge means 35 can be of any type even though it is preferable to use suction cup means or suchlike.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Robotics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une installation et un procédé de production d'articles faits d'un matériau plastique couvert d'un film décoratif thermoplastique, comprenant une pluralité d'appareils de moulage (50) fonctionnant en parallèle. Chaque appareil (50) possède un ensemble de pose et de découpage (36) qui prépare un segment du film (19), un plan de transport (15) qui transfert le film à l'intérieur du moule, et une presse (11) qui soutient et positionne les éléments du moule (12, 13, 22). Cette installation comprend aussi un écrou à anneau (22) qui peut bouger d'une position à l'intérieur du moule, sur lequel le plan de transport (15) repose afin de transférer le segment de film (19), dans une position située à l'extérieur du moule dans laquelle l'article est extrait (37) lorsque le moulage est terminé. La position de préparation du segment de film (19) est à proximité de la position d'extraction de l'article (37), mais elle est physiquement séparée de celle-ci.
PCT/IB2004/000359 2003-02-14 2004-02-12 Installation de production d'articles faits de materiau plastique, procede associe et articles obtenus WO2004071739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD20030036 ITUD20030036A1 (it) 2003-02-14 2003-02-14 Impianto per la produzione di manufatti in materiale plastico, relativo procedimento e manufatti cosi' ottenuti.
ITUD2003A000036 2003-02-14

Publications (1)

Publication Number Publication Date
WO2004071739A1 true WO2004071739A1 (fr) 2004-08-26

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PCT/IB2004/000359 WO2004071739A1 (fr) 2003-02-14 2004-02-12 Installation de production d'articles faits de materiau plastique, procede associe et articles obtenus

Country Status (2)

Country Link
IT (1) ITUD20030036A1 (fr)
WO (1) WO2004071739A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105150472A (zh) * 2015-09-30 2015-12-16 吉林大学 注塑车标水口切割及标背附胶一体设备
CN106078412A (zh) * 2016-06-24 2016-11-09 芜湖美威包装品有限公司 泡沫边角料的修剪装置

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EP1078731A1 (fr) * 1999-08-04 2001-02-28 Georg Geiss Maschinenfabrik Procédé et appareil pour changer un moule et remplacer une palette de matériau dans une machine de thermoformage
WO2002020239A1 (fr) * 2000-09-05 2002-03-14 G.M.P. Spa Dispositif pour produire des articles en polyurethanne, procede afferent et articles en polyurethanne ainsi obtenus
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JPS63130310A (ja) * 1986-11-20 1988-06-02 Meiki Co Ltd 金型搬送用無人搬送車
US5273597A (en) * 1988-11-26 1993-12-28 Honda Giken Kogyo Kabushiki Kaisha Trim member for motor vehicle and method of and system for manufacturing the same
US5800771A (en) * 1992-04-28 1998-09-01 Dai Nippon Printing Co., Ltd. method for forming pattern onto article during injection molding thereof
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EP0668231A2 (fr) * 1994-01-27 1995-08-23 Shima Seiki Mfg., Ltd. Appareil et méthode pour alimenter une feuille pour recouvrir un tissu dans une machine de coupe
US5940953A (en) * 1997-09-03 1999-08-24 Brown Machine Llc. Cart and method for changing tooling in a thermoformer machine
EP1078731A1 (fr) * 1999-08-04 2001-02-28 Georg Geiss Maschinenfabrik Procédé et appareil pour changer un moule et remplacer une palette de matériau dans une machine de thermoformage
US6379606B1 (en) * 1999-11-17 2002-04-30 Brown Machine, Llc. Method for thermoforming twin sheet workpiece
WO2002020239A1 (fr) * 2000-09-05 2002-03-14 G.M.P. Spa Dispositif pour produire des articles en polyurethanne, procede afferent et articles en polyurethanne ainsi obtenus
WO2002060668A1 (fr) * 2001-02-01 2002-08-08 Krauss-Maffei Kunststofftechnik Gmbh Unite de traitement de plastique comportant deux stations de traitement reliees par un canal de transport
EP1249329A2 (fr) * 2001-04-12 2002-10-16 Whirlpool Corporation Procédé de fabrication des éléments structurels extérieurs pour un appareil électroménager

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105150472A (zh) * 2015-09-30 2015-12-16 吉林大学 注塑车标水口切割及标背附胶一体设备
CN106078412A (zh) * 2016-06-24 2016-11-09 芜湖美威包装品有限公司 泡沫边角料的修剪装置

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