WO2007129350A1 - procÉdÉ et Équipement pour la formation d'articles manufacturÉs comprenant un ÉlÉment À mailles - Google Patents

procÉdÉ et Équipement pour la formation d'articles manufacturÉs comprenant un ÉlÉment À mailles Download PDF

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Publication number
WO2007129350A1
WO2007129350A1 PCT/IT2007/000056 IT2007000056W WO2007129350A1 WO 2007129350 A1 WO2007129350 A1 WO 2007129350A1 IT 2007000056 W IT2007000056 W IT 2007000056W WO 2007129350 A1 WO2007129350 A1 WO 2007129350A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
length
net material
net
frame
Prior art date
Application number
PCT/IT2007/000056
Other languages
English (en)
Inventor
Pietro Facchetti
Original Assignee
M.C.S. Facchetti S.R.L.
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 M.C.S. Facchetti S.R.L. filed Critical M.C.S. Facchetti S.R.L.
Publication of WO2007129350A1 publication Critical patent/WO2007129350A1/fr

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
    • 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
    • B29C45/14016—Intermittently feeding endless articles, e.g. transfer films, to 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
    • 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
    • B29C45/14262—Clamping or tensioning means for the insert
    • 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
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • 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
    • B29C2045/14188—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 trimming the article in 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C45/14221—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 by tools, e.g. cutting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2028/00—Nets or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/44—Furniture or parts thereof
    • B29L2031/443—Chairs

Definitions

  • This invention concerns in general the chair sector composed of plastic components, and refers in particular to a method and equipment for the construction of manufactured articles incorporating a net member and designed to make chair seats and/or backrests. State of the Technique
  • the net member is fixed directly to the chair frame in correspondence with the seat and/or backrest, partially by welding and partially by means of an adhesive, as made disclosed, for example, in the document JP-2004057646.
  • the solution is however complex and not very practical to achieve, and the result is immaterial.
  • the net member is stretched over, folded and fixed to a frame or perimetral edge, and this is then used by fitting and/or fixing it by means of screws into a corresponding groove provided in the chair frame around the seat and/or backrest, as disclosed, for example, in document EP-1552771.
  • the edges of the net member are embedded, by overmoulding, consequently retained, in a frame or perimetral border made of a plastic material.
  • the net member is firstly held and stretched, longitudinally and crossways, between the stretching organs of a loom; then while it is still stretched, it is sandwiched between two opposite members of a supporting frame positioned between mould members of a moulding machine; successively, after having been released by the moulding machine, the net member is trimmed of the excess membrane around the carrier member; then the carrier member with the net member is placed between two open mould- halves of the injection moulding machine in which, following the closure of the mould-halves, the overmoulding of the frame or perimetral edge is carried out on the element inside said frame; finally, after opening the mould members and extracting the manufactured article, the supporting frame is unblocked and removed and the net member is trimmed around the frame or perimetral edge.
  • One of the objectives of this invention is to create the conditions to avoid the problems and weaknesses of the technical note, by actually simplifying the construction procedure, in particular but not exclusively, of finished articles, such as chair seats and backrests, including a net member, and this without having the need for additional machines and to have to fix beforehand the net member to a temporary supporting frame.
  • Another objective of the invention is therefore to provide an innovative procedure for the construction of at least articles of the type mentioned previously, which is carried out completely, starting from the contribution of the net, within the sphere of the injection moulding machine for the overmoulding of the frame or border of the net member.
  • Yet another objective of the invention is to provide an apparatus which can be applied to an injection moulding machine for plastic items at least for making articles, in particular chair seats and backrests, incorporating a net member.
  • a further objective of the invention is to provide a machine for injection moulding of plastic items equipped for the production of articles, such as chair seats and backrests, incorporating a net member.
  • a manufacturing process is proposed for the production of articles, in particular chair seats and/or backrests, incorporating a net member with a plastic frame and perimetral edge, comprising steps to: prepare an injection moulding machine for plastics with a mould made up of two mould-halves moving in unison to open and close the mould and forming, when closed, an impression corresponding to the frame or edge of the article; place and position in the mould, when open, a length of the initial net, held and stretched at right angles, facing one mould-half, said length of the net measuring in length and width sufficient to extend beyond the external edges of the impression in said mould; close the mould, blocking the net at the same time against other mould- half ; inject in the impression defined by said closed mould a plastic material to form an overmoulded frame or perimetral edge and incorporating a corresponding
  • This last step of the process can be preceded by trimming the length of the net around the frame or perimetral edge directly when still in the machine.
  • the article after being extracted from the mould, the article can be picked up so as to trim the part of the net extending beyond the frame or perimetral edge using appropriate means external to the machine.
  • the net at the start is shaped like a continuous band and the length fed each time between the two open mould-halves is unwound at intervals and cut from a roll of net positioned near the mould.
  • the length of the initial net positioned between the two mould-halves is held and stretched by moving devices associated with the mould, and blocking of the length of net during closing of the mould is carried out by automatic pressure devices.
  • Fig. 1 shows a view of an article designed to form either the seat or backrest of a chair
  • Fig. 2 shows a partial schematic view of a machine for injection moulding complete with equipment to perform the invention process
  • Fig. 3 shows a cross section according to arrows A-A in Fig. 2 with mould open;
  • Fig. 4 shows a view similar to the one in Fig. 3, but with the mould in the closing phase
  • Fig. 5 shows a view similar to the one in Fig. 4, but with the mould closed
  • Figs. 6 and 7 show in detail, a pressure device in the respective start and finish blocking position of the length of the net in the mould corresponding to the length encircled in Figs. 4 and 5.
  • Fig. 1 shows an example of an article 10 the shape and dimensions of which can differ to construct the seat or backrest of a chair.
  • the article 10 comprises basically a net member 11 the edges of which are embedded, therefore blocked, in a frame or perimetral border 12, made of plastic, preferably having a certain level of elasticity.
  • Figs 2-5 of said drawings show a part of a machine 13 for injection moulding of plastic parts equipped with a forming mould 14.
  • This mould is made up of two mould-halves 15, 16: one fixed and the other movable along guide columns 17 towards and away from the fixed mould-half respectively for closing and opening the mould itself.
  • the facing surfaces of the two mould- halves 15, 16 are machined to form together when closed, a cavity 18 to contain the net member 11 and to form an impression 19 corresponding to the frame or perimetral border 12 of the article to be made.
  • the machine 13 is also equipped, in association with the mould 14, with a support 20 designed to sustain a net material 21 from which to obtain the net member 11 linked with the construction of the article 10 required.
  • the support 20 is preferably but not necessarily, positioned above the mould 14, and the net material is in the shape of a continuous band wrapped in a roll 21' and with a width greater than the width of the impression 19 of the frame or edge 12 delineated by the mould-halves.
  • the roll 21' is supported by the abovementioned support 20 and turns on its axis, and the net material 21 is unwrapped at intervals downwards following a path passing between the two mould-halves 15, 16 and set by a series of stretching and drawing rollers positioned parallel to the roll axis.
  • these rollers comprise at least a first couple of rollers 22 and a second couple of tension rollers 23 positioned respectively above and below the fixed mould-half 15 and a third couple of drawing rollers 24 at a distance from the second couple of rollers 23.
  • the net material 21 is drawn between said rollers 22-24 at an appropriate speed as shown for example in Fig. 3. Its forward movement is set and controlled by the action of the drawing rollers 24, whereas the tension rollers 22 and 23 are arranged and governed to block and stretch, both longitudinally, and crossways, the length of net material 21' compacted each time between the first and second couple of rollers 22 and 23 and face the fixed mould-half 15.
  • Pressure devices 25 either spring or pneumatically governed, facing towards the other mould-half and designed to block the length of net material 21" against the surface of the fixed mould-half 15 as soon as the mould is closed - Figs. 6-7, are mounted on board the movable mould-half 16, external to the impression 19 corresponding to the frame or border 12 of the article to be made.
  • the procedure of the invention is carried out as follows: a length 21 ' of the net material 21 is drawn in front of the fixed mould-half 15; the length of net material 21" is stretched by the tension rollers 22 and 23; the movable mould-half 16 is moved towards the fixed one to block the length of net 21" against the surface of the fixed mould-half - Fig 4 - with successive complete closure of the mould - Fig. 5
  • the mould is opened to extract a semi-finished article, cutting at the same time, at least crossways, the length of net material extending, in this case, above the frame or edge 12 formed in the mould.
  • an operation to trim the superfluous parts 121 - Fig. 1 - of the length of net overlapping the frame or edge 12 will be provided. This operation can be carried out directly in the machine with the mould open, immediately prior to extraction of the semi- finished article, or off the machine, working on the semi-finished article, in either of the cases using an appropriate trimming system.
  • the finished article will now be ready to be applied in the usual way to construct, depending on its configuration, a seat or a backrest.

Abstract

La présente invention concerne un processus et équipement pour la construction d'articles (10) comprenant un élément à mailles (11) dans un cadre plastique et un bord périphérique (12), en particulier les sièges et/ou les dossiers de chaises. L'article est réalisé à l'aide d'un moule (14) d'une machine de moulage par injection de plastique (13), en positionnant dans le moule ouvert une longueur de matériau à mailles initial (21), maintenu et étiré dans des directions orthogonales ; la longueur de matériau à mailles étant bloquée dans le moule dès la fermeture de celui-ci ; en injectant du plastique dans le moule fermé pour constituer un cadre surmoulé ou bord périphérique et en incorporant une pièce correspondante de la longueur de mailles ; puis ouvrant le moule pour extraire l'article et pour rogner simultanément ou plus tard les parties superflues des mailles faisant saillie du cadre ou du bord de l'article.
PCT/IT2007/000056 2006-05-10 2007-01-29 procÉdÉ et Équipement pour la formation d'articles manufacturÉs comprenant un ÉlÉment À mailles WO2007129350A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBS20060097 ITBS20060097A1 (it) 2006-05-10 2006-05-10 Metodo e attrezzatura per la formazione di manufatti incorporanti un elemento a rete con margini annegati in un telaio o bordo perimetrale
ITBS2006A000097 2006-05-10

Publications (1)

Publication Number Publication Date
WO2007129350A1 true WO2007129350A1 (fr) 2007-11-15

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ID=38069118

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2007/000056 WO2007129350A1 (fr) 2006-05-10 2007-01-29 procÉdÉ et Équipement pour la formation d'articles manufacturÉs comprenant un ÉlÉment À mailles

Country Status (2)

Country Link
IT (1) ITBS20060097A1 (fr)
WO (1) WO2007129350A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2509760B1 (fr) * 2009-12-09 2017-01-25 Lancastria Limited Moulage par injection d'élastomères souples
CN114801031A (zh) * 2022-03-08 2022-07-29 厦门劲博汇科技有限公司 一种休闲椅承托板的成型装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63297011A (ja) * 1987-05-29 1988-12-05 Toppan Printing Co Ltd 同時転写成形方法及び装置
JPH01237110A (ja) * 1987-11-30 1989-09-21 Toppan Printing Co Ltd 正確な位置決め機構付き同時成形転写装置
US5082435A (en) * 1989-06-23 1992-01-21 Yoshida Industry Co., Ltd. Transferring and molding apparatus
DE4100538A1 (de) * 1990-11-12 1992-05-14 Wulf & Co Emsa Werk Verfahren zur herstellung flaechenhafter kunststoffteile und werkzeug zur durchfuehrung des verfahrens
JPH05318526A (ja) * 1992-05-19 1993-12-03 Nitto Boseki Co Ltd 転写成型装置
US6125521A (en) * 1992-06-15 2000-10-03 Herman Miller, Inc. Process for making an office chair
US6328548B1 (en) * 1999-01-12 2001-12-11 Illinois Tool Works Inc. System for capturing stretched fabrics in carrier frames
EP1621385A1 (fr) * 2004-07-28 2006-02-01 ORIS FAHRZEUGTEILE HANS RIEHLE GmbH Élément pour véhicules automobiles et son procédé de fabrication

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63297011A (ja) * 1987-05-29 1988-12-05 Toppan Printing Co Ltd 同時転写成形方法及び装置
JPH01237110A (ja) * 1987-11-30 1989-09-21 Toppan Printing Co Ltd 正確な位置決め機構付き同時成形転写装置
US5082435A (en) * 1989-06-23 1992-01-21 Yoshida Industry Co., Ltd. Transferring and molding apparatus
DE4100538A1 (de) * 1990-11-12 1992-05-14 Wulf & Co Emsa Werk Verfahren zur herstellung flaechenhafter kunststoffteile und werkzeug zur durchfuehrung des verfahrens
JPH05318526A (ja) * 1992-05-19 1993-12-03 Nitto Boseki Co Ltd 転写成型装置
US6125521A (en) * 1992-06-15 2000-10-03 Herman Miller, Inc. Process for making an office chair
US6328548B1 (en) * 1999-01-12 2001-12-11 Illinois Tool Works Inc. System for capturing stretched fabrics in carrier frames
EP1621385A1 (fr) * 2004-07-28 2006-02-01 ORIS FAHRZEUGTEILE HANS RIEHLE GmbH Élément pour véhicules automobiles et son procédé de fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2509760B1 (fr) * 2009-12-09 2017-01-25 Lancastria Limited Moulage par injection d'élastomères souples
CN114801031A (zh) * 2022-03-08 2022-07-29 厦门劲博汇科技有限公司 一种休闲椅承托板的成型装置

Also Published As

Publication number Publication date
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