WO1989005226A1 - Procede et unite d'ajutage d'injection pour le moulage d'articles en plastique - Google Patents

Procede et unite d'ajutage d'injection pour le moulage d'articles en plastique Download PDF

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Publication number
WO1989005226A1
WO1989005226A1 PCT/US1988/001387 US8801387W WO8905226A1 WO 1989005226 A1 WO1989005226 A1 WO 1989005226A1 US 8801387 W US8801387 W US 8801387W WO 8905226 A1 WO8905226 A1 WO 8905226A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold cavity
housing
injection
gas
valve member
Prior art date
Application number
PCT/US1988/001387
Other languages
English (en)
Inventor
Siebolt Hettinga
Original Assignee
Siebolt Hettinga
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 Siebolt Hettinga filed Critical Siebolt Hettinga
Publication of WO1989005226A1 publication Critical patent/WO1989005226A1/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
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1734—Nozzles therefor
    • B29C45/1735—Nozzles for introducing the fluid through the mould gate, e.g. incorporated in the injection nozzle
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C2045/1722—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles injecting fluids containing plastic material

Definitions

  • Th.i.s invention relates to an injection nozzle unit and method for molding plastic articles having pre ⁇ determined density and surface characteristics.
  • Injection nozzles for injecting a plastic ma- 5 terial into a mold cavity separately or concurrently with a blowing agent or mixed with, air or gas are well known.
  • a blowing agent or mixed with, air or gas are well known.
  • To obtain these various type molded articles generally requires different type injection nozzle units.
  • This invention provides a nozzle unit adapted to handle different plastic compositions efficiently and economically to produce quality molded articles.
  • the injection material can be injected alone or intermixed with a suitable gas or air which will hereinafter col- 5 lectively be referred to as "a gas".
  • a gas a suitable gas or air which will hereinafter col- 5 lectively be referred to as "a gas”.
  • the plastic ma ⁇ terial can be injected alone into the mold cavity and the gas can be injected into the mold cavity prior to or following a plastic injection. The plastic, therefore,
  • samn can be injected into a gas pressurized mold cavity or following a plastic injection operation gas can be used to clear the nozzle unit of residual plastic concurrently with assuring a complete filling of the mold cavity with plastic.
  • Fig. 1 is a rear perspective view of an in ⁇ jection molding machine embodying the nozzle unit of this invention
  • Fig. 2 is an enlarged longitudinal sectional view of the nozzle unit shown generally in Fig. 1;
  • Figs. 3, 4, 5 and 6 are sectional detail views taken along the lines 3-3, 4-4, 5-5 and 6-6, respectively, in Fig. 2;
  • Fig. 7 is a sectional detail view showing the coacting relation of the nozzle unit with, the inlet of a mold cavity for injection into the mold cavity of a gas only;
  • Fig. 8 is a sectional detail view illustrated similarly to Fig. 7 showing parts in changed positions;
  • Fig. 9 shows th.e nozzle unit in position for the injection of a fiberglass and plastic composition ma ⁇ terial into a mold cavity
  • Fig. 10 is illustrated similar to Fig. 9 and shows the nozzle unit in position for cutting off the injection of the composite fiberglass and plastic ma ⁇ terial into the mold cavity;
  • Fig. 11 is illustrated similar to Fig. 10 and shows the nozzle unit out of operative association with the mold cavity inlet and the resultant cylindrical re ⁇ sidual core on the molded article;
  • Fig. 12 illustrates the relative arrangement of the nozzle unit parts for concurrently injecting a composite plastic material of incompatible plastics mixed • ith a gas for injection into a mold cavity to produce a molded container having a gas permeable wall structure;
  • Fig. 13 illustrates, the completion of a plastic injection operation wherein the mold cavity has an un ⁇ filled void and residual plastic remains in th.e nozzle unit;
  • Fig. 14 illustrates the residual plastic shown in Fig. 13 being injected into the mold cavity by a pressurized gas to fill the cavity void concurrently with clearing the nozzle unit of the residual plastic
  • Fig. 15 illustrates the injection of a plastic material into a mold cavity against atmospheric pres ⁇ sure
  • Fig. 16 illustrates the tendency of the leading edge or surface of plastic being injected against an atmospheric pressure to shatter or disrupt during the filling of the mold cavity
  • Fig. 17 illustrates the injection of a plastic material into a prior gas pressurized mold cavity and the resultant smooth, flow of the material into all portions of the cavities sidewall by a controlled rate of release of the pressurized gas to retain the leading surface of the injected plastic material against disruption;
  • Fig. 18 is a diagrammatic illustration of a computer programmed control circuit for operating the nozzle unit in accordance with specified injection re ⁇ quirements.
  • a molding machine 20 with an elongated main frame 21 having a mold unit 2*2 positioned adjacent one end 23 to be hereinafter referred to as the forward end of the main frame 21.
  • the mold 24 has a cavity inlet 25 arranged for operative association with the nozzle unit 26 of this invention.
  • the nozzle unit 26, shown generally in Fig. 1, is mounted at the forward end of an injection barrel 27 for a screw 29 driven by a motor 31 supported on a mounting member 37 on a carriage 33.
  • the injection barrel projects forwardly from a cross head 32, supported on the carriage 33.
  • the cross head additionally supports a pair of cylinder assemblies 34 arranged to opposite sides of the barrel 27 with their associated piston rods 36 carried in the mounting member 37 for the motor 31.
  • the cylinders 34 operate to move the bar ⁇ rel 27 relative to the injection screw 29 during an injection operation, with the material to be injected being admitted to the barrel 27 from a hopper 28.
  • the nozzle unit 26 is movable into and out of operative as ⁇ sociation with, the mold cavity inlet 25 on a reciprocal movement of the carriage 33 relative to the machine frame 21.
  • This reciprocal movement is responsive to the op ⁇ eration of a double acting cylinder 38 pivotally inter- connected between the carriage 33 and the frame 21 and the operation of which is controlled by a linear trans ⁇ ducer 39 mounted on the frame 21 for coacting engagement with a limit member" 41 on the carriage 33.
  • the injection nozzle unit 26 of this in- vention includes a housing unit 42 comprised of three sections, namely, a forward section 43, a central section 44, and a rear section 46 which, are threadably interconnected as indicated at 47, with, the rear section 46 in threadable connections at 45 with, the forward end of the injection barrel 27.
  • the housing unit 42 is of a generally cyclindrical tubular shape having a ma ⁇ terial inlet 48 in the rear housing section 46 open to the forward end of the injection barrel 27.
  • the forward housing section 43 has a front wall 49 formed with a central projected dome 51 for coacting engagement with the concave depression 52 at the outer end of the mold cavity inlet 25.
  • the front wall 49 which constitutes the front wall of the housing unit 42, has a bore 53 of a reduced section relative to the housing axial bore 54 for a purpose to appear later.
  • the bore 54 is of varying diameters as it extends through the connected housing sections 43, 44 and 46.
  • a supply tube 55 for supplying a gas. to the mold cavity includes a lateral section 56 positioned trans ⁇ versely of the rear housing section 46 to which is se ⁇ cured a longitudinal section 57 extended axially of and 5 within the housing bore 54 for the termination adjacent the rear end of the housing front section 43.
  • valve mem ⁇ ber 61 has a main body section 62 slidably mounted on the gas supply tube section 57 and a front end portion 5 63 of a reduced diameter.
  • An axial bore in the valve member 61 has bore sections of varying diameters over the length, thereof.
  • the rear end portion of the body section 62 has a series of three radially extended vanes 64 (Figs. 2 and 3), the extremities of which are in guid- o able engagement with, the inner peripheral surface of the bore 54 in housing section 44 to guide reciprocal move ⁇ ment of the valve member axially of the housing unit 42.
  • the junction of the housing sections 43 and 44 is defined by a shoulder 66 (Fig. 2) for abutting en- 5 gagement with the forward ends 67 of the vanes 64 to limit forward movement of the valve member 61 relative to the housing unit 42.
  • a compression spring 68 is mounted about the longitudinal section 57 of the gas supply tube and arranged in compression between the vanes 0 64 and a shoulder 69 located forwardly of the gas sup ⁇ ply tube lateral section 56 and formed in the housing bore 54 within the rear housing section 46.
  • the spring 68 functions to continuously urge the valve member 61 into engagement with, the shoulder 66. 5 As shown in Figs. 2 and 7, when the valve member
  • a check valve unit 75 is car ⁇ ried in the valve, member 61 forwardly of the supply tube section 57 and rearwardly of the reduced end sec ⁇ tion 63 of the valve member 61 which section 63 is guidably supported for reciprocal axial movement within the bore 53 to function as a slide valve within an an ⁇ nular bearing formed by the inner peripheral surface of bore 53.
  • the check valve 75 (Figs. 5 and 6 ⁇ operates in response to pressure differences at the opposite ends thereof to control the supply of gas from the tube 55 and through, the slide valve.63 into the inlet 25 of the mold cavity 58.
  • the slide valve section 63 of the valve member 61 (Figs. 6 and 7) is formed with radially extended passage ways 71 that are positioned within the bore 53 when the valve member 61 is in abutting engagement with the shoulder 66 on the housing unit 42. In this position, the valve member 61 cuts off the travel of plastic ma ⁇ terial into the mold cavity 58 from the housing bore 54. with the valve member section 63 positioned in registra ⁇ tion with, the cavity inlet 25 the check valve 75 is movable to an open position to provide for the admission of gas from the supply tube 55 into the mold cavity 58.
  • the nozzle unit 26 is movable forwardly as a unit relative to the valve member 61 from its position shown in Fig. 7 to the position thereof shown in Fig. 8.
  • this forward movement results in a compression of the spring 68 and movement of the housing 42 in a direction forwardly of the valve member 61 to the position shown in Fig. 8 wherein the dome 51 on the front wall 49 of the housing is received in a nested relation within the depression 52 at the mold cavity inlet 25 and the passages 71 are moved inwardly of the housing 42 and out of the bore 53.
  • Plastic material within the bore 54 of the housing 42 is thus permitted to flow through, the passages 71 and the slide valve section 63 into the mold cavity 58.
  • the check valve 75 is moved to a gas closing position therefor by the pressure applied thereon by the injected plastic material.
  • each injection op ⁇ eration be controlled by a programmed computer so that (1) gas may be injected into the mold cavity either be ⁇ fore or after the injection therein of a plastic material, (2) the shot volume of the injection operation may be varied and (3) . gas and plastic can be injected together into the mold cavity.
  • a computer programmed control system having a source 74 of a gas or air supplied under pressure by a pump 76 through a line 77 provided with a computer actuated solenoid valve 82 which, regulates the gas flow to a pres ⁇ sure transducer 78 that admits the gas to the supply tube 55.
  • a pressure release line 79 carries a computer activated solenoid valve 81 which operates reversely relative to the solenoid yalve 82 in the line 77; namely, when the yalve 82 is in open position, the valve 81 is in the closed position therefor and in turn, valve 82 is in the closed position when valve 81 is in an open po ⁇ sition.
  • This concurrent actuation of the valves 82 and 81 takes place in response to the computerized program.
  • the movement of the slide valve portion 63 of the valve member 61 into and out of engagement with, the mold inlet 25 takes place in response to the operation of the cylinder 38 which, is actuated by the linear trans- ducer 39 haying connection with, the computerized control system.
  • the signal from the linear transducer 39 actuates solenoid valves 83 and 84 which control the supply of oil from a reservoir 85 to the double acting cylinder 38.
  • the reciprocal move- irtent of the injection housing 27 and injection nozzle unit 26, as a unit with, respect to the injection screw 29, is responsive, as previously described, to the opera ⁇ tion of double acting cylinders 34 for movement in one direction by a computer actuated solenoid valve 86 and movement in an opposite direction by the pressure of the plastic material collected or accumulated on the front side or end of the injection screw 29.
  • the injection barrel or housing 27 is heated to a predeter ⁇ mined temperature, depending upon the characteristics of the plastic material being injected, by suitable heating elements mounted thereon and indicated at 88 (JFig. 1) .
  • the compute system Cnot shown), for controlling the op ⁇ eration of. the control circuits shown in Fig. 18 pro ⁇ vides for the injection operation of the nozzle unit 26 in a predetermined manner dependent upon the composition of the injection material and the design characteristics or specification of the article to be molded.
  • Figs. 9, 10 and 11 there is illustrated the operation of the nozzle unit 26 for the injection into a mold cavity 92 of a fiberglass-plastic material.
  • the material 89 is sheared or cut off on entry of the passage ways 71 within the bore or annular seat 53 by the coaction of the shoulder 72 at the inner end of the bore 53 with, the rear sides or edges 73 of the pas ⁇ sage ways 71.
  • a clean cut edge 95 of the material remains within the nozzle 26 with a corresponding clean cut edge 93 at the trailing edge of the residual material 94 remaining within the mold inlet 91 and removable from the mold cavity with the
  • the material to be injected is comprised of a couple of incompatible plastic material materials such as a poly ⁇ ethylene and styrene materials which are mixed in the proportions by weight of 60 percent of a polyethylene to 40 percent of a styrene or 40 percent of a styrene to 60 percent of a polyethylene.
  • incompatible plastic material materials such as a poly ⁇ ethylene and styrene materials which are mixed in the proportions by weight of 60 percent of a polyethylene to 40 percent of a styrene or 40 percent of a styrene to 60 percent of a polyethylene.
  • Incompatible nylon and rub ⁇ ber materials may also be. used in the same reversed proportions by weight.
  • Figs. 13 and 14 illustrate the operation of the injection nozzle 26 to fill out a mold cavity with plas ⁇ tic material without requiring the injection of additional material for such purpose
  • Fig. 13 on com- pletion of the injection of material into the mold cavity 58b, there remains voids 97 within the mold cavity remote from the cavity inlet 25.
  • gas from the supply tube 55 is applied against the residual plastic 98 to fill the voids 97 as shown in Fig. 14.
  • the nozzle unit 26 is initially in its position of Fig. 7 to introduce air alone and under pressure into the mold cavity 58c. This air pressure is then retained within the cavity 58c during the injection operation by controlling the release of the exhausted air through, a regulating valve indicated at 101 so that any tendency of the leading edges 99 of the incoming material to explode or shatter is counter- acted by the applied controlled pressure within the mold cavity. As a result, the leading edges 99 retain their smooth shape for a controlled slow flow of the material into all portions of the mold cavity.

Landscapes

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

Abstract

L'unité d'ajutage (26) pour machine de moulage par injection-gonflage comporte un tube d'alimentation d'air (55-57) ainsi qu'une chambre d'alimentation de matière plastique (54) et une soupape (59) afin de commander sélectivement l'injection d'air et/ou de plastique, séparément ou intermélangé, dans une cavité de moule (58). On peut également introduire l'air dans la cavité de moule ou après l'injection de la matière plastique, et on peut varier le volume de matière plastique pour procéder à des injections successives afin de mouler des articles aux caractéristiques de taille et de configuration variables.
PCT/US1988/001387 1987-12-09 1988-04-27 Procede et unite d'ajutage d'injection pour le moulage d'articles en plastique WO1989005226A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13043587A 1987-12-09 1987-12-09
US130,435 1987-12-09

Publications (1)

Publication Number Publication Date
WO1989005226A1 true WO1989005226A1 (fr) 1989-06-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/001387 WO1989005226A1 (fr) 1987-12-09 1988-04-27 Procede et unite d'ajutage d'injection pour le moulage d'articles en plastique

Country Status (1)

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WO (1) WO1989005226A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321160A2 (fr) * 1987-12-16 1989-06-21 Melea Limited Procédé de moulage par injection et buse utilisée à cet effet
EP0653282A2 (fr) * 1993-11-15 1995-05-17 Mitsubishi Gas Chemical Company, Inc. Buse d'alimentation de gaz
US6866171B2 (en) 2000-01-10 2005-03-15 Sulzer Chemtech Ag Method for introducing additives

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940123A (en) * 1957-07-17 1960-06-14 Basf Ag Shut-off nozzle for injection molding of thermoplastic materials
US3095609A (en) * 1962-01-22 1963-07-02 Rhodiaceta Nozzle closure for injection moulding press
US3268635A (en) * 1963-02-25 1966-08-23 Robert A Kraus Arrangement for forming foam plastic article
DE1929343A1 (de) * 1969-06-10 1970-12-17 Werkzeugbau Fuchslocher Ohg Spritzduese zum Einbringen des Treibgases bei der Verarbeitung aller schaumfaehigen Kunststoffe
DE2716817A1 (de) * 1977-02-21 1978-08-24 Asahi Dow Ltd Spritzgussvorrichtung fuer synthetische kunststoffe
GB2148784A (en) * 1983-10-24 1985-06-05 Toshiba Machine Co Ltd Injection molding

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940123A (en) * 1957-07-17 1960-06-14 Basf Ag Shut-off nozzle for injection molding of thermoplastic materials
US3095609A (en) * 1962-01-22 1963-07-02 Rhodiaceta Nozzle closure for injection moulding press
US3268635A (en) * 1963-02-25 1966-08-23 Robert A Kraus Arrangement for forming foam plastic article
DE1929343A1 (de) * 1969-06-10 1970-12-17 Werkzeugbau Fuchslocher Ohg Spritzduese zum Einbringen des Treibgases bei der Verarbeitung aller schaumfaehigen Kunststoffe
DE2716817A1 (de) * 1977-02-21 1978-08-24 Asahi Dow Ltd Spritzgussvorrichtung fuer synthetische kunststoffe
GB2148784A (en) * 1983-10-24 1985-06-05 Toshiba Machine Co Ltd Injection molding

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321160A2 (fr) * 1987-12-16 1989-06-21 Melea Limited Procédé de moulage par injection et buse utilisée à cet effet
EP0321160A3 (en) * 1987-12-16 1990-06-27 Ladney, Michael Injection molding method and nozzle for use therein
EP0653282A2 (fr) * 1993-11-15 1995-05-17 Mitsubishi Gas Chemical Company, Inc. Buse d'alimentation de gaz
EP0653282A3 (fr) * 1993-11-15 1995-09-13 Mitsubishi Gas Chemical Co Buse d'alimentation de gaz.
US5626815A (en) * 1993-11-15 1997-05-06 Mitsubishi Gas Chemical Company, Inc. Gas-feeding nozzle and apparatus and method employing such nozzle
US6866171B2 (en) 2000-01-10 2005-03-15 Sulzer Chemtech Ag Method for introducing additives

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