WO1988003473A1 - Procede de formation d'objets creux en elastomere par injection et vulcanisation a l'aide de moules fortement adherents - Google Patents

Procede de formation d'objets creux en elastomere par injection et vulcanisation a l'aide de moules fortement adherents Download PDF

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Publication number
WO1988003473A1
WO1988003473A1 PCT/IT1986/000094 IT8600094W WO8803473A1 WO 1988003473 A1 WO1988003473 A1 WO 1988003473A1 IT 8600094 W IT8600094 W IT 8600094W WO 8803473 A1 WO8803473 A1 WO 8803473A1
Authority
WO
WIPO (PCT)
Prior art keywords
die
core
dies
halves
elastomer
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.)
Ceased
Application number
PCT/IT1986/000094
Other languages
English (en)
Inventor
Alberto Ferri
Fedelia Artuso
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to KR1019880700753A priority Critical patent/KR890700078A/ko
Publication of WO1988003473A1 publication Critical patent/WO1988003473A1/fr
Priority to DK356388A priority patent/DK356388D0/da
Priority to NO882904A priority patent/NO882904L/no
Anticipated expiration legal-status Critical
Ceased 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles
    • B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
    • B29D22/006—Hot water bottles
    • 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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • 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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • B29C2045/0072—Joining parts moulded in separate cavities the parts to be joined being moulded in a stack mould

Definitions

  • two halves of the body are molded in the two chambers created between the two halves of the die and the intermediate core.
  • the core is removed from the die, the edges of the two halves are placed together, fluid under pressure is injected inside the die after which the elastomer is cured.
  • Subject of the invention is a process for molding elastomer in dies to form hollow bodies so shaped that, by cutting them apart on a geometrical plane, the edges of the two halves obtained have outlines substantially suited to complete matching.
  • the complete die is composed of three main parts: an upper half, a lower half and an intermediate core creating one or more pairs of chambers respectively for the two substantially complementary halves of each object.
  • the material Is injected simultaneously into the two chambers for making each object, through a side channel for each chamber, one of said channels being situated between one face of the core and the upper half of the die, and the other between the other face of the core and the lower half of the die.
  • Said channels lying parallel, are connected by means of a feed hole passing transversally through the core.
  • Said hole Is connected,by means of a longitudinal branching duct inside the core, with a second transversal hole for influx of the material, opening onto one face of the core, opposite to one of the die halves at a point corresponding to a mouth in said die half, in such a way as to be aligned with the input nozzle for the material.
  • Each half of the molded object is therefore connected to the material input channel on a lateral edge.
  • the core is extracted leaving the two halves of the hollow object in the two half dies; the die is then closed once more to align the two edges of said two halves. Finally, the two edges are welded together during the curing process.
  • said appendix reacting to the pulling force on the material left inside the core feed hole, causes detachment of said material from the two halves of each hollow object allowing said objects to remain closely fitting to the two half dies to ensure effective curing.
  • the die having been closed following removal of the core, fluid is blown into said die under pressure to assist and maintain close adherence of the two halves of the hollow object to their respective halves of the die while the curing process continues.
  • the die has two pairs of chambers so that two hollow objects cen be produced simultaneously.
  • the core feed hole lies between the two pairs of chambers.
  • a channel connects each of the two mouths of said feed hole to the chambers which form the two halves of the hollow object in each half of the die.
  • the effect of the foregoing is to ensure a more balanced distribution of the material, a higher output from the die, and a superior end product.
  • a grip slide to support the nozzles blowing the fluid in under pressure while curing is proceeding, and to permit said nozzles to translate.
  • Any piece to be inserted is preferably associated to the nozzles used for blowing the fluid in under pressure.
  • the core is supported by a grip slide moving back and forth perpendicularly to the direction in which the die opens and closes.
  • Fig. 1 Viewof the open die, cut through at its central longitudinal axis.
  • Fig. 2 Detail of the closed die, cut through at its central longitudinal axis.
  • Fig. 3 Partial cross section of the die at the position of the core feed hole.
  • FIG. 4 The cross section of Fig. 3 when Injection molding has been completed.
  • Fig. 5 Front view of the upper half of the die.
  • Fig. 6 The open die cut through at the level of an impression.
  • Fig. 8 The die in Fig. 6, closed, during the curing process.
  • the die (10) comprises the upper die half (11), the lower die half (12) and the intermediate core (13).
  • the upper die half (11) shows the female impressions (14) and (16) substantially equal to the impressions (15) and (17) in the lower die half.
  • the core (13) shows the male shapes (18), (19) and (20), (21), for creating, when the die is closed, the chambers (29), (31) and (30), (32) respectively for the two objects formed by the die, especially two hot water bottles.
  • the material is injected into the mold through the nozzle (39) which, at each molding operation, approaches the die (11) penetrating into the housing (40) until it comes in contact with the projecting mouth (41) which, when the die closes, penetrates inside the hole (42) of the die (11). From the mouth (41 ) the fluid material flows, through the vertical hole (22), into the branch duct(23) communicating centrally with the vertical transversal feed hole (24) passing through the core (13).
  • the material flows through the upper mouth (25) and lower mouth (26) into the channels (27) and (28) respectively situated in the body of the half die (11) at the top, and of the other half die (12) at the bottom.
  • Said channels (27) arid (28) connect with the chambers (29) and (30) created by matching the upper die with the core (13) and, respectively, with the chambers (31) and (32) created by matching up the lower die (12) with the core
  • the die On completion of the forming process the die is opened to allow the core (13) to be removed.
  • Figure 6 shows a longitudinal cross section at the level of the impressions (14) and (15) and of the corresponding male forms (18), (20).
  • Figure 7 shows the stage corresponding to closure of the die and the beginning of the injection process.
  • the two parts of the die are put back together again as seen in Fig. 8 and, after injecting compressed air inside the die, the curing stage begins which welds the outer edges (39) and (40) of the two halves like (35) and (36) of the object that, in the example described, together form a hot water bottle (41).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Le procédé décrit sert à former des objets creux (41) en élastomère, tels que notamment des bouteilles d'eau chaude, par injection du matériau dans les deux chambres (29-31), (30-32) formées entre deux demi-moules (11), (12) et un noyau intermédiaire (13). Chaque chambre (29-31), (30-32) est reliée par un canal latéral (27), (28) respectivement à la première (25) et à la deuxième embouchure (26) d'un trou d'alimentation transversal (24) qui traverse le noyau (13), dans lequel le matériau pénètre en s'écoulant par l'intermédiaire d'un conduit de ramification interne (23). Dans chacun des demi-moules (11) et (12) dans la zone correspondant à la première (25) et à la deuxième embouchure (26) du trou d'alimentation (24) est disposé un évidement (33), (34) dont l'ouverture extérieure est inférieure à son volume interne, le but étant d'empêcher, par réaction du matériau qui pénètre dans ledit évidement, que les deux moitiés (35-36), (37-38) de l'objet creux (41) ne se détachent des deux demi-moules (11), (12), au moment où on démoule le noyau (13) pour passer à la phase de vulcanisation.
PCT/IT1986/000094 1986-11-06 1986-12-29 Procede de formation d'objets creux en elastomere par injection et vulcanisation a l'aide de moules fortement adherents Ceased WO1988003473A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019880700753A KR890700078A (ko) 1986-11-06 1986-12-29 밀착하는 다이(die)들로 탄성 중합체를 사출하고 경화하여서 중공체(中空體)를 성형하는 방법
DK356388A DK356388D0 (da) 1986-11-06 1988-06-28 Fremgangsmaade til fremstilling af hule genstande i elastomert materiale ved indsproejtning og haerdning med taet forbundne forme
NO882904A NO882904L (no) 1986-11-06 1988-06-29 Fremgangsmaate for forming av hule gjenstander i elastomermed tett fastsittende pressformer ved injeksjon og herding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8622255A IT1206351B (it) 1986-11-06 1986-11-06 Procedimento per la formazione di oggetti cavi in elastomero, ad iniezione e vulcanizzazione, con stampi ad elevata aderenza.
IT22255A/86 1986-11-06

Publications (1)

Publication Number Publication Date
WO1988003473A1 true WO1988003473A1 (fr) 1988-05-19

Family

ID=11193734

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1986/000094 Ceased WO1988003473A1 (fr) 1986-11-06 1986-12-29 Procede de formation d'objets creux en elastomere par injection et vulcanisation a l'aide de moules fortement adherents

Country Status (4)

Country Link
KR (1) KR890700078A (fr)
AU (1) AU6845187A (fr)
IT (1) IT1206351B (fr)
WO (1) WO1988003473A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683031A3 (fr) * 1994-05-21 1996-09-11 Siegfried Hofmann Gmbh Werkzeu Procédé de fabrication d'objets en plusieurs parties moulés par injection et dispositif pour la mise en oeuvre du procédé.
EP0867266A3 (fr) * 1997-03-26 1999-06-09 Takata Corporation Sac en matière plastique et son procédé de fabrication

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839759A (en) * 1955-08-25 1960-06-29 Harvey Neil Ansell Improvements in or relating to articles made from rubber or rubber-like materials
FR2114604A5 (fr) * 1970-11-13 1972-06-30 Exxon Research Engineering Co
US3933967A (en) * 1973-02-20 1976-01-20 Taylor Don A Method of making seamless hollow molded articles
US4028042A (en) * 1973-08-14 1977-06-07 Dunlop Limited Moulding apparatus
GB2042412A (en) * 1979-02-19 1980-09-24 Desma Werke Gmbh Moulding hollow articles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839759A (en) * 1955-08-25 1960-06-29 Harvey Neil Ansell Improvements in or relating to articles made from rubber or rubber-like materials
FR2114604A5 (fr) * 1970-11-13 1972-06-30 Exxon Research Engineering Co
US3933967A (en) * 1973-02-20 1976-01-20 Taylor Don A Method of making seamless hollow molded articles
US4028042A (en) * 1973-08-14 1977-06-07 Dunlop Limited Moulding apparatus
GB2042412A (en) * 1979-02-19 1980-09-24 Desma Werke Gmbh Moulding hollow articles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683031A3 (fr) * 1994-05-21 1996-09-11 Siegfried Hofmann Gmbh Werkzeu Procédé de fabrication d'objets en plusieurs parties moulés par injection et dispositif pour la mise en oeuvre du procédé.
EP0867266A3 (fr) * 1997-03-26 1999-06-09 Takata Corporation Sac en matière plastique et son procédé de fabrication
US6044629A (en) * 1997-03-26 2000-04-04 Takata Corporation Method of manufacturing resin bag

Also Published As

Publication number Publication date
IT8622255A0 (it) 1986-11-06
IT1206351B (it) 1989-04-14
KR890700078A (ko) 1989-03-02
AU6845187A (en) 1988-06-01

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