WO1988010190A1 - Process for molding rubber objects by injection and vulcanization with inserts that may be oblong and non-rigid - Google Patents

Process for molding rubber objects by injection and vulcanization with inserts that may be oblong and non-rigid Download PDF

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Publication number
WO1988010190A1
WO1988010190A1 PCT/IT1987/000082 IT8700082W WO8810190A1 WO 1988010190 A1 WO1988010190 A1 WO 1988010190A1 IT 8700082 W IT8700082 W IT 8700082W WO 8810190 A1 WO8810190 A1 WO 8810190A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
die
parts
inserts
rigid
Prior art date
Application number
PCT/IT1987/000082
Other languages
French (fr)
Inventor
Alberto Ferri
Fedelia Artuso
Original Assignee
Alberto Ferri
Fedelia Artuso
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 Alberto Ferri, Fedelia Artuso filed Critical Alberto Ferri
Priority to KR1019890700273A priority Critical patent/KR890701339A/en
Publication of WO1988010190A1 publication Critical patent/WO1988010190A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/72—Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/14—Supporting insulators
    • 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
    • B29C2045/0067—Joining parts moulded in separate cavities interposing an insert between the parts to be assembled
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • 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
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3412—Insulators

Definitions

  • Subject of the invention is a process for molding rubber ob ⁇ jects, especially electric insulators, containing inserts of a heterogeneous kind, hich may also be oblong and floppy, by means of a mold composed o one half die, the other half die and an intermediate core.
  • the shapes of said two cham- bers are equal and aligned.
  • the core presents reliefs whose shape and size correspond to the shape and size of the insert.
  • the material is injected simultaneously into the two cham- bers corresponding to the two parts of the object, through one or more pairs of lateral channels.
  • One channel of each pair, lying on parallel planes, is placed between the core and the first " half die, and the other chan ⁇ nel between the core and the second half die, said channels being connected by a feed " hole passing through them in a di ⁇ rection transversal to the core- Said holes for one- or more pairs of feed channels are in turn connected by means of a longitudinal tube, inside the core, ope_ ing into a feed mouth communicating with the outside, which mouth can be connected to the nozzle of the press for inject ⁇ ing the material.
  • the die On completion of the molding process the die is opened, the two halves are separated and the core extracted, the two halves of the object remaining inside the chambers in the two halves of the die.
  • the inserts are placed in the cavi ⁇ ties, made for them by the reliefs on the core, in the two molded halves of the object.
  • the die is then closed again this time with the two molded parts matching and the insert laid between them.
  • the wo halves of the- object become fused together with the insert in the middle.
  • the object so formed is an electric insulator comprising an insert consisting of a straight cable of insulating fibres resistant to trac ⁇ tion, said cable extending axially from one end of said insulator to the other.
  • the die is placed horizontally so that, after molding, the force of gravity facilitates ap ⁇ plication and s abilization of the inserts in the cavities prepared for them in the molded parts of the object.
  • Characteristics and aims of the invention will be made even clearer by the following example of its execution illustra ⁇ ted by drawings.
  • Fig.2 Plan view of lower die half.
  • Fig.3 Plan view of the core.
  • Fig. Die closed on completion of molding, one half cut through longitudinally.
  • Fig.5 Die closed on completion of molding, cut through traftsversally at the point of one of the core holes for feeding in material.
  • Fig.6 Die open, on completion of molding, after extraction of the core, one half die being cut through longitu- dinally.
  • Fig.7 Die open after the insert has been placed in position.
  • Fig.8 Die closed, during vulcanizing, view showing one of the half dies cut through longitudinally.
  • Figs. 5 and 9 are drawn to a larger scale than that used for the other figures.
  • the die (10) comprises the upper half die ( 11), the lower half die (12) and the intermediate core (13). With said die simultaneous production can be made of two electric insulators (50), (51), Figs.8 and 9, each of which comprises axially a cable (56), (57) of insulating fibres possessing high tensile strength.
  • the upper half die (11) shows the chambers ( 14), (16), iden ⁇ tical to the chambers (15), (17) of the lower half die for creating the two longitudinal halves (30), (31) and (32), (33), Figs. 4 and 5, of the two insulators (50), (51) res ⁇ pectively, Figs. 8 and 9, which become joined one to the other during the vulcanizing stage (Figs. 8 and 9).
  • the core (13) shows the reliefs (18), (19) and (20), (21) wh.ich form, in the two halves of the insulators, the axial cavities (52), (53) and (54), (55), Figs. 6-9) correspond ⁇ ing to the cables (56), (57) to be inserted.
  • the material is injected in by the injection press through the core (13) flowing into the hole (22) opening onto, one of the lesser sides (23) of the core (13) and then into the central longitudinal tube (24).
  • Said tube communicates with the transversal vertical feed holes (25) of the core from where the material flows into the channels (27), (28) obtained respectively in the bodies of the upper half die (11) and the lower half die (12).
  • plastic material is injected causing formation of the two electric insulators (50), (51) seen in Figs. 8 and 9, in the chambers (14), ( 15) and ( 16), (17) of the two halves respectively (30), (31) and (32), (33) seen in Figs. 4 and 5.
  • the die is opened -(Fig.6) to al ⁇ low the core to be extracted.
  • the material which had penetrated inside the niches (34), (35) creates a force tending to hold back the material that had entered the channels (27), (28), opposing detachment of the moulded bodies (30), (31) and (32), (33) from the sides of the die halves.
  • the fibreglass cables (-56), (57) seen in Fig.7 are placed in the cavities (53), (55) of the lower molded halves (31) and (33).
  • the die is then closed (Figs. 8 and 9) which causes the halves (30), (32 . ) to match respectively with the halves (31), (33) of the insulators, vulcanization proceeds joining together the opposing halves (31), (30) and (32), (33) with the cables (56), (57) inside them forming the insulators (50), (51).
  • the advantages of the process are clearly evident.
  • the inert materials of whatever kind having been placed * after the molding stage, in the specially prepared cavi ⁇ ties in the two halves of the molded objects inside the two half dies, when the two said parts of the objects have been joined together by vulcanization, said inert materials will occupy precisely the desired position in ⁇ side said objects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Insulating Bodies (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Process for molding rubber objects, especially electric insulators with internal inserts of heterogenous pieces, including oblong and non-rigid kinds, by means of a die composed of two half dies (11), (12) and an intermediate core, the two half dies (11), (12) having chambers whose shape respectively corresponds to that of the two parts (30), (31) composing the object to be produced, the core having reliefs, coinciding with said chambers, of shape and size corresponding to those of the inserts (56), on completion of molding the two half dies (11), (12) being separated and the intermediate core being extracted, leaving in their relative chambers the two parts (30), (31) of the object, the insert (56) being then placed in the cavity (53) made for it in one (31) of the molded parts of the object produced by one of the reliefs of the core, after placing of said insert the mold (10) being once more closed matching together the two molded parts (30), (31) with the insert (56) between them, union of the two parts (30), (31) of the object being then secured by means of vulcanization, the insert (56) being enclosed inside them.

Description

PROCESS FOR MOLDING RUBBER OBJECTS BY INJECTION AND VUL¬ CANIZATION WITH INSERTS THAT MAY BE OBLONG AND NON-RIGID Various processes are adopted for manufacturing synthetic and natural rubber objects having inserts of varied and he erogeneous materials.
The most well-known process involving "compression" com¬ prises a die composed of two halves.
Sheets of rubber with the inserts among them, are placed in the die. The material is then compressed and heated in special presses, the finished product being obtained by the process known as "vulcanization".
Particularly in the case of long or floppy inserts, the coin plex phenomena interacting inside the die, depending on le¬ vels of pressure and temperature, on the size of the body to be molded, and other factors, will clearly lead to a con¬ siderable variation in the volumes of rubber round the in¬ sert between one molding operation and the next. As a general rule, therefore, it becomes practically impos¬ sible for the insert to occupy a precise position inside the finished • obj ect .
The above invention eliminates these drawbacks, further pro¬ viding considerable advantages as will be explained below. Subject of the invention is a process for molding rubber ob¬ jects, especially electric insulators, containing inserts of a heterogeneous kind, hich may also be oblong and floppy, by means of a mold composed o one half die, the other half die and an intermediate core.
In the two halves of the dr.e there are two chambers the forms of which correspond respectively to the two component parts of the object.
In the zone bounded by the core the shapes of said two cham- bers are equal and aligned. Coinciding with said chambers the core presents reliefs whose shape and size correspond to the shape and size of the insert.
The material is injected simultaneously into the two cham- bers corresponding to the two parts of the object, through one or more pairs of lateral channels.
One channel of each pair, lying on parallel planes, is placed between the core and the first" half die, and the other chan¬ nel between the core and the second half die, said channels being connected by a feed "hole passing through them in a di¬ rection transversal to the core- Said holes for one- or more pairs of feed channels are in turn connected by means of a longitudinal tube, inside the core, ope_ ing into a feed mouth communicating with the outside, which mouth can be connected to the nozzle of the press for inject¬ ing the material.
On completion of the molding process the die is opened, the two halves are separated and the core extracted, the two halves of the object remaining inside the chambers in the two halves of the die. The inserts are placed in the cavi¬ ties, made for them by the reliefs on the core, in the two molded halves of the object. The die is then closed again this time with the two molded parts matching and the insert laid between them. During vulcanization the wo halves of the- object become fused together with the insert in the middle. In each half of the die, coinciding with the one mouth, and with the other, of the core feed holes, there is a niche shaped substantially like a truncated cone, the diameter of the external hole being smaller than the internal ones. Therefore, when the die is opened and the core taken out, the material that has penetrated inside said niches during the feed stage, reacting against the pull exerted by the material present in the feed holes, due to said pulling effect opposes detachment of the halves of the object from the sides of the two halves of the die.
In one specific example of execution the object so formed is an electric insulator comprising an insert consisting of a straight cable of insulating fibres resistant to trac¬ tion, said cable extending axially from one end of said insulator to the other.
In preferred executions the die is placed horizontally so that, after molding, the force of gravity facilitates ap¬ plication and s abilization of the inserts in the cavities prepared for them in the molded parts of the object. Characteristics and aims of the invention will be made even clearer by the following example of its execution illustra¬ ted by drawings.
Fig. l Die with two molding halves for production of elec¬ tric insulators, seen open with one of the molding halves cut longi udinally.
Fig.2 Plan view of lower die half. Fig.3 Plan view of the core.
Fig. Die closed, on completion of molding, one half cut through longitudinally. Fig.5 Die closed, on completion of molding, cut through traftsversally at the point of one of the core holes for feeding in material. Fig.6 Die open, on completion of molding, after extraction of the core, one half die being cut through longitu- dinally.
Fig.7 Die open after the insert has been placed in position. Fig.8 Die closed, during vulcanizing, view showing one of the half dies cut through longitudinally. Fig.9 Die closed, during vulcanization, cut through trans- versally. Figs. 5 and 9 are drawn to a larger scale than that used for the other figures.
The die (10) comprises the upper half die ( 11), the lower half die (12) and the intermediate core (13). With said die simultaneous production can be made of two electric insulators (50), (51), Figs.8 and 9, each of which comprises axially a cable (56), (57) of insulating fibres possessing high tensile strength.
The upper half die (11) shows the chambers ( 14), (16), iden¬ tical to the chambers (15), (17) of the lower half die for creating the two longitudinal halves (30), (31) and (32), (33), Figs. 4 and 5, of the two insulators (50), (51) res¬ pectively, Figs. 8 and 9, which become joined one to the other during the vulcanizing stage (Figs. 8 and 9). The core (13) shows the reliefs (18), (19) and (20), (21) wh.ich form, in the two halves of the insulators, the axial cavities (52), (53) and (54), (55), Figs. 6-9) correspond¬ ing to the cables (56), (57) to be inserted.
The material is injected in by the injection press through the core (13) flowing into the hole (22) opening onto, one of the lesser sides (23) of the core (13) and then into the central longitudinal tube (24).
Said tube communicates with the transversal vertical feed holes (25) of the core from where the material flows into the channels (27), (28) obtained respectively in the bodies of the upper half die (11) and the lower half die (12).
Longitudinal holes (43) are made in the core ( 13) and these are connected at the extremities by U-shaped joins. Said channels (27), (28) connect laterally with the cham¬ bers (14), (16) and (15), ( 17) of the die halves, ( 11) and ( 12) respectively (Figs. 2 and 5). Within the bodies of the upper and lower die halves,( l l) and ( 12), at points corresponding to the feed holes (25) in the core ( 13), niches are made, (34) and (35) respec¬ tively, shaped substantially like truncated cones with their bases inwards, the diameter of the mouth being therefore smaller than the diameters at the bases ('Fig.5).
On closing the die, matching the two die halves ( I I) and ( 12) with the core, plastic material is injected causing formation of the two electric insulators (50), (51) seen in Figs. 8 and 9, in the chambers (14), ( 15) and ( 16), (17) of the two halves respectively (30), (31) and (32), (33) seen in Figs. 4 and 5.
On completion of molding, the die is opened -(Fig.6) to al¬ low the core to be extracted. During the opening stage the material which had penetrated inside the niches (34), (35) creates a force tending to hold back the material that had entered the channels (27), (28), opposing detachment of the moulded bodies (30), (31) and (32), (33) from the sides of the die halves. Having extracted the core, the fibreglass cables (-56), (57) seen in Fig.7, are placed in the cavities (53), (55) of the lower molded halves (31) and (33).
The die is then closed (Figs. 8 and 9) which causes the halves (30), (32.) to match respectively with the halves (31), (33) of the insulators, vulcanization proceeds joining together the opposing halves (31), (30) and (32), (33) with the cables (56), (57) inside them forming the insulators (50), (51). The advantages of the process are clearly evident. The inert materials of whatever kind having been placed*, after the molding stage, in the specially prepared cavi¬ ties in the two halves of the molded objects inside the two half dies, when the two said parts of the objects have been joined together by vulcanization, said inert materials will occupy precisely the desired position in¬ side said objects.
This result is of particular importance in the case of inerts which are completely floppy such as cables, cord, wires and generally speaking any long and non-rigid bo¬ dies .
The above is obtained by simple means such as two half dies and an intermediate core, requiring no special and specific means for preliminary positioning of the inserts in the cavities to be filled with plastic material.

Claims

1. Process for molding rubber objects, especially elec¬ tric insulators with internal inserts of heterogeneous pieces, including oblong and non-rigid kinds, characterized in that the die ( 10) is composed of three principal parts, a first half die (ll), a second half die (12) and an inter¬ mediate core ( 13), the first half die ( 11) having a chamber ( 14) the shape of which corresponds to one part (30) of the two parts forming the object (50) and the second half die ( 12) having a chamber ( 15) the shape of which corresponds to the second part (31) of the object (50), said two cham¬ bers ( 14), ( 15) presenting identical and aligned shapes in the zone bounded by the core ( 13), said core ( 13) having, in coincidence with said chambers ( 14), ( 15) reliefs ( 18), ( 19) of shapes and sizes corresponding to those of the inserts (56), the material being injected simultaneously into the two chambers ( 1 ),( 15), corresponding to the two parts (30), (31) of the object (50), through one or more pairs of la¬ teral channels (27), (28), one channel (27) of each pair be- ing placed between the core ( 13) and the first half- die( l l) and the second channel (28) between the core ( 13) and the second half die ( 12), said channels (27), (28) of each pair being substantially on*.parallel planes and connected together by a feed hole (25) passing through, transversally to the core (13), said holes (25) of one or more pairs (27), (28) of feed channels being in turn connected by an internal long¬ itudinal tube in the core ( 13) opening out into a feed mouth communicating with the outside and suitable for connection to the nozzle of the press injecting the material, the die (10) being opened on completion of molding with separation of the two half dies ( 11), ( 12) and extraction of the inter- mediate core (13), the two parts (30), (31) of the object (50) remaining lodged in the chambers (14), (15) of the two half dies (11), (12), the insert(56)being then placed in the cavity (53) created by the relief (19) in the mol- ded part (31) of the object (50), the die (10) being then closed again after said insert has been put in, the two molded parts (30), (31) matching up and the insert "(56) remaining between them, subsequent vulcanizing then join¬ ing the two parts (30), (3&) of the object (50) around and enclosing the insert (56)."
2. Process for molding rubber objects, especially elec¬ tric insulators with internal inserts of heterogeneous pieces, including oblong and non-rigid kinds, as in claim 1, characterized in that both the half dies (11), (12), in the zone coinciding with the one and the other mouths of the feed holes (25) in the core (13) presenta niche (34),C35) substantially shaped like a truncated cone the diameter of the external hole being smaller than the internal diameters so that the material , hich has penetrated during the feed stage inside said niches (34), (35),reacts, when the die
(10) is opened and the core ( 13) is extracted, to the pul¬ ling force exerted by the material present in the feed holes (25), opposing detachmen ,due to said pulling effect, of the parts (30), (31) of the object (50) from the sides of the two half dies (11), (12).
3. Process for molding rubber objects, especially electric insulators with internal inserts of heterogeneous pieces, including oblong and non-rigid kinds, as in claim 1, cha¬ racterized in that the two parts (30), (31) into which each object (50) is divided, substantially correspond to the two halves of said object.
4. Process for molding rubber objects, especially electric insulators with internal inserts of heterogeneous pieces, including oblong and non-rigid kinds, as in claim 1, cha¬ racterized in that the object formed is an electric insula- tor (50) comprising an insert consisting of a rectilinear cable (56) of insulating fibre of high tensile strength that extends from one extremity to the other of said insu¬ lator (50).
5. Process for molding rubber objects , especially electric insulators with internal inserts of heterogeneous pieces, including oblong and non-rigid kinds, as in claim 1, cha¬ racterized in that the die ( 10)' permits simultaneous forma¬ tion of two objects (50), (51) with two pairs of chambers (14), (15) and (16), (17) respectively for the two parts (30), (31) and (32), (33) of the two objects (50) and (51) with two pairs of reliefs ( 18), ( 19) and (20), (21) one on each face of the core (13) to form the seats in said parts (30), (31) and (32), (33) for the inserts (56), (57), the feed holes (25) of the core ( 13) being placed between said pairs of chambers ( 14), (15) and (16), (17), the lateral channels (27), (28) communicating with said feed holes(25) extending respectively from the chambers ■ ( 14 ) , ( 15) for one object (50) to the chambers alongside (16), ( 17) for the se_ cond object (51).
6. Process for molding rubber objects especially electric insulators with internal inserts of heterogeneous pieces, including oblong and non-rigid kinds, as in claim 1, cha¬ racterized in that in the core ( 13) there are longitudinal serpentine-connected holes (43) parallel to the two faces of said core ( 13) for heat regulation of the fluid and so to ensure that the injected plastic material flows properly.
7. Process for molding rubber objects especially electric insulators with internal inserts of heterogeneous pieces, including oblong and non-rigid kinds, as in claim 1, cha¬ racterized in that the feed mouth (22) of the core (13)opens onto one of the lesser sides (23) of said core and in the middle of said core.
8. Process for molding rubber objects especially electric insulators with internal inserts of heterogeneous pieces,
'including oblong and non-rigid kinds, as in claim 1, cha- racterized in that the die (10) is placed horizontally so that, after molding, the force of gravity facilitates ap¬ plication and stabilization of the inserts (56), (57) in the cavities (53), (55) prepared for them in the molded parts (31), (33) of the object.
PCT/IT1987/000082 1987-06-23 1987-09-18 Process for molding rubber objects by injection and vulcanization with inserts that may be oblong and non-rigid WO1988010190A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019890700273A KR890701339A (en) 1987-06-23 1987-09-18 Method for injection molding and curing rubber objects with long, non-solid inserts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT20995A/87 1987-06-23
IT8720995A IT1215573B (en) 1987-06-23 1987-06-23 PROCEDURE FOR THE FORMATION OF INJECTION RUBBER OBJECTS AND VULCANIZATION WITH EVEN OBLONG AND FLOUR INSERTS.

Publications (1)

Publication Number Publication Date
WO1988010190A1 true WO1988010190A1 (en) 1988-12-29

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PCT/IT1987/000082 WO1988010190A1 (en) 1987-06-23 1987-09-18 Process for molding rubber objects by injection and vulcanization with inserts that may be oblong and non-rigid

Country Status (4)

Country Link
KR (1) KR890701339A (en)
AU (1) AU8031987A (en)
IT (1) IT1215573B (en)
WO (1) WO1988010190A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611213A1 (en) * 1995-03-23 1996-09-26 Ngk Insulators Ltd Pressure moulding device for manufacturing compound isolators
FR2803558A1 (en) * 2000-01-11 2001-07-13 Gouillardon Gaudry METHOD FOR PRODUCING AND PLACING AN ELASTOMERIC ENVELOPE AROUND A FULL OR HOLLOW BODY
CN102765159A (en) * 2012-08-01 2012-11-07 长春博超汽车零部件股份有限公司 Composite forming device for making interior trim panel of automobile

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US2893058A (en) * 1955-06-24 1959-07-07 Federal Mogul Bower Bearings Seal ring
US3350252A (en) * 1964-05-11 1967-10-31 Stowe Woodward Inc Structure and manufacture of bowling balls
FR2114604A5 (en) * 1970-11-13 1972-06-30 Exxon Research Engineering Co
DE2425076A1 (en) * 1974-05-24 1975-11-27 Rhein Westfael Isolatoren Outdoor electrical insulators - made by vertically casting resin weather sheds round G.R.P stalk
US3933967A (en) * 1973-02-20 1976-01-20 Taylor Don A Method of making seamless hollow molded articles
GB2042412A (en) * 1979-02-19 1980-09-24 Desma Werke Gmbh Moulding hollow articles
DE2935603A1 (en) * 1979-09-04 1981-03-12 Desma-Werke Gmbh, 2807 Achim Injection moulding tennis balls - with partly vulcanised hemispheres pressed together after removing core tool and replacing with air

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Publication number Priority date Publication date Assignee Title
US2893058A (en) * 1955-06-24 1959-07-07 Federal Mogul Bower Bearings Seal ring
US3350252A (en) * 1964-05-11 1967-10-31 Stowe Woodward Inc Structure and manufacture of bowling balls
FR2114604A5 (en) * 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
DE2425076A1 (en) * 1974-05-24 1975-11-27 Rhein Westfael Isolatoren Outdoor electrical insulators - made by vertically casting resin weather sheds round G.R.P stalk
GB2042412A (en) * 1979-02-19 1980-09-24 Desma Werke Gmbh Moulding hollow articles
DE2935603A1 (en) * 1979-09-04 1981-03-12 Desma-Werke Gmbh, 2807 Achim Injection moulding tennis balls - with partly vulcanised hemispheres pressed together after removing core tool and replacing with air

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611213A1 (en) * 1995-03-23 1996-09-26 Ngk Insulators Ltd Pressure moulding device for manufacturing compound isolators
DE19611213C2 (en) * 1995-03-23 2002-01-17 Ngk Insulators Ltd Device for compression molding composite insulators
FR2803558A1 (en) * 2000-01-11 2001-07-13 Gouillardon Gaudry METHOD FOR PRODUCING AND PLACING AN ELASTOMERIC ENVELOPE AROUND A FULL OR HOLLOW BODY
WO2001051268A1 (en) * 2000-01-11 2001-07-19 Gouillardon Gaudry Sa Method for placing an elastomer envelope around an elongated body
CN102765159A (en) * 2012-08-01 2012-11-07 长春博超汽车零部件股份有限公司 Composite forming device for making interior trim panel of automobile
CN102765159B (en) * 2012-08-01 2015-03-25 长春博超汽车零部件股份有限公司 Composite forming device for making interior trim panel of automobile

Also Published As

Publication number Publication date
IT1215573B (en) 1990-02-14
AU8031987A (en) 1989-01-19
IT8720995A0 (en) 1987-06-23
KR890701339A (en) 1989-12-20

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