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WO1999030892A1 - Moulage par injection d'articles a fines parois - Google Patents

Moulage par injection d'articles a fines parois Download PDF

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Publication number
WO1999030892A1
WO1999030892A1 PCT/GB1998/003452 GB9803452W WO9930892A1 WO 1999030892 A1 WO1999030892 A1 WO 1999030892A1 GB 9803452 W GB9803452 W GB 9803452W WO 9930892 A1 WO9930892 A1 WO 9930892A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
article
plasticised material
gates
injection
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/GB1998/003452
Other languages
English (en)
Inventor
Kim Patchett
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 AU11667/99A priority Critical patent/AU1166799A/en
Publication of WO1999030892A1 publication Critical patent/WO1999030892A1/fr
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
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7356—Heating or cooling of the mould the temperature of the mould being near or higher than the melting temperature or glass transition temperature of the 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
    • B29L2031/48—Wearing apparel
    • B29L2031/4842—Outerwear
    • B29L2031/4864—Gloves

Definitions

  • the present invention relates to the injection moulding of thin wall articles and in particular to injection moulding of gloves for medical use.
  • the invention is not limited to the manufacture of gloves and may extend to many other applications, for example the manufacture of finger cots and condoms.
  • medical gloves have been manufactured from elastomeric materials, such as natural rubber latex (NRL) , in a process whereby the latex is compounded into a water soluble solution and glove shaped formers, manufactured from porcelain, are dipped into the solution and later removed resulting in a thin latex deposit on the former. Whilst still on the former, the latex is vulcanised and all traces of water removed by a combination of chemical and heat processes. Finally, the latex film, now in the form of a glove, is stripped from the former ready for post process chlorination, packaging and or sterilising.
  • NRL natural rubber latex
  • Symptoms of allergic reaction to latex can be local, regional, systemic or a combination of all three. The symptoms range from Contact Urticaria (itching, irritation and swelling at the site of contact) through Asthma to Anaphylaxis. Anaphylaxis is a systemic allergic reaction that can result in Tachycardia, Palpitations and Hypertension, which may lead to heart failure and consequent death.
  • the manufacture of medical gloves from Styrenic Block Co- Polymers is currently carried out by dissolving the polymer, or combinations of polymers, in a volatile Hydro-Carbon solvent, for example Toluene (Registered Trade Mark), and dipping glove shaped formers into the solvented polymer and then removing the formers from the solution. Whilst still on the former, the Toluene (Registered Trade Mark) solvent is evaporated off leaving a film of Styrene Block Co-Polymer on the glove former. Finally, the Styrene Block Co-Polymer film, now in the form of a glove, is stripped from the former ready for post processing, packaging and or sterilization.
  • a volatile Hydro-Carbon solvent for example Toluene (Registered Trade Mark)
  • Toluene (Registered Trade Mark) solvent is evaporated off leaving a film of Styrene Block Co-Polymer on the glove former.
  • Styrene Block Co-Polymer film now in the form of a glove, is
  • Toluene (Registered Trade Mark)
  • Other similar solvents is highly flammable and rigorous safety precautions must be taken in the manufacturing process to reduce the risk of fire, explosion or suffocation.
  • These precautions may involve the use of specific airflow devices in the manufacturing process to drive the airborne solvent fumes to chemical scrubbers for removal from the atmosphere within the manufacturing facility.
  • Further precautions may include the provision of blast resistant walls in the manufacturing facility to contain fire and explosion. Such precautions add considerable cost to the manufacturing process whilst the risk of a catastrophic accident is not completely eliminated.
  • a product manufactured by dipping has substantial physical disadvantages that are inherent in the dipping process.
  • the wall thickness over the surface of solvent dipped or aqueous dipped gloves inevitably varies considerably between the fingertip and cuff. This is explained by the fact that in the dipping process, the finger tips portion of the glove remains immersed in the solvent or aqueous solution longer than the cuff region and therefore becomes thicker. Since the cuff region must be relatively thick and strong to cope with the forces exerted on the cuff when the wearer dons the glove, the finger tip section of the glove may be thicker than would be ideally required. This extra thickness may result in an undesirable loss of tactile feel and comfort to the wearer.
  • a further consideration in the manufacture of medical gloves is that of surface finish.
  • the surface in contact with the former has a surface finish imparted to it by the surface finish existing on the surface of the former.
  • the glove product is removed from the former, it is turned inside out and the said surface finish imparted by the glove former to the glove surface becomes the outer surface on the completed glove product .
  • This process result may be used to advantage to create a surface that is beneficial for grip, tactility and feel.
  • the inside of the glove product has a smooth finish since, in the manufacturing process of dipping, a textured finish can not be readily imparted to the glove surface that was not in contact with the face of the glove former.
  • a textured or engineered finish to the outer surface of the glove may aid grip, tactility and feel whilst a textured or engineered surface finish to the inside of the glove may aid the process of donning and general comfort by reducing the surface area of material in contact with the wearers skin and the consequent friction forces, during the action of donning.
  • gloves manufactured by the dipping process In a further consideration of gloves manufactured by the dipping process, recent tests and investigations performed in the United States, by a number of qualified bodies, have determined that a significant proportion of said gloves contain microscopic holes in the walls of the articles that are permeable to virus and other organisms. Such holes are considered to be formed due to the presence of coagulants, dilutants and other compounds essential to the dipping process and are therefore difficult to avoid.
  • a method for manufacturing an article comprising: - injecting plasticised material into a mould; stripping the moulded article from the mould; wherein the mould is kept at a temperature above the no- flow temperature of the plasticised material throughout injection of the plasticised material and stripping of the article from the mould.
  • the method is for manufacturing a thin walled article .
  • the article has a wall thickness of 0.01 mm to 2.50 mm.
  • the plasticised material is injected into the mould cavity at a velocity in excess of 500mm/s.
  • the plasticised material is injected into the mould cavity at a velocity in excess of lOOOmm/s.
  • the plasticised material is injected into the mould cavity at a number of injection gates.
  • injection of the plasticised material is carried out under closed loop control .
  • the plasticised material is a block co-polymer.
  • the mould is maintained at a temperature substantially of 100 Celsius.
  • the mould comprises first and second tool parts, a valved gate being provided in the first moulding tool part, wherein the gate has an inner sleeve heated to a temperature above the temperature of the moulding tool parts and being in contact with plasticised material, the gate further having an outer sleeve interposed between the inner sleeve and first moulding tool part, for the purpose of local heating and/or cooling.
  • the first moulding tool part is a fixed moulding tool part and the second moulding tool part is a moving moulding tool part .
  • a method for injection moulding a thin walled article in the thickness range 0.01mm to 2.50mm comprising: -
  • the gates are opened simultaneously to fill a mould cavity that has been evacuated of air by a vacuum device .
  • the gates are opened in a manner whereby at least one gate is opened at a different time from the remaining gates for the purpose of controlling the location of the resulting weld line or lines in the article.
  • At least one gate is of a larger or smaller diameter, when opened, than the other remaining gates for the purpose of controlling the location of the resulting weld line or lines in the article.
  • the surface finish at any point across any surface of the article is of varied texture or pattern or other engineered surface or a combination of varied textured, pattern or other engineered surface.
  • the method further comprises the use of a lamination means for forming different layers within the walls of the article. At least two dissimilar materials may be used to create a laminated structure.
  • the article is a glove, a condom or a finger cot .
  • a method for moulding an article using multiple gate injection apparatus comprising: -
  • an injection moulding gate valve comprising: -
  • a heated inner sleeve arranged in use to be in contact with plasticised material for injecting into a mould cavity; and an outer sleeve, which may be heated or cooled, positioned around the inner sleeve for thermally isolating the inner sleeve from other mould components.
  • Figure 1 shows the side elevation view of the outer surface of a glove as it would be viewed whilst inside an injection moulding tool of the present invention
  • Figure 2 shows the glove of Figure 1 from below
  • Figure 3 shows schematically moulding apparatus of the present invention for forming a glove
  • Figure 4 shows in greater detail injection valve apparatus of the present invention used for forming a glove
  • Figure 5 shows diagrammatically the formation of a weld line within the present invention.
  • Figures 1 and 2 show views of the outer surface of a glove 1 as it would be viewed whilst inside an injection moulding tool. For clarity, neither the moulding tool nor the moulding core is shown in Figures 1 or 2.
  • Surrounding the glove is a system of runners or tubes 2, which feed the plasticised polymer into the mould via injection gates 3.
  • a mould 5 includes therein a core 4 such that a cavity 6 conforming to the shape of the desired article, in the present example a glove is formed there between.
  • a screw mechanism 8 is used to plasticise polymer material and to inject it into the mould.
  • the screw mechanism 8 comprises a screw 7 which can both rotate and move axially.
  • solid pellets of polymer material at nominally room temperature, are introduced into the screw mechanism via a hopper or suction feed and are moved forward within the injection barrel due to the rotational action of the screw 7.
  • the forward axial motion of the screw 7 is hydraulically operated, and is carefully controlled in relation to the opening of the gates 3 as explained further below in relation to Figure 4.
  • Figure 4 shows a detailed drawing of a gate 3.
  • the gate includes a valve body 11 mounted in an insert 12 housed in turn in a fixed half 13 of the moulding tool.
  • the cavity in the form of the glove shape 6 is formed in a moving half of the moulding tool 15.
  • An air operated gate 14 determines whether polymer material can pass into a mould cavity 6, operation of the air operated gate being synchronised with actuation of the screw 7. This synchronisation is preferably computer controlled using fully closed loop sensing and control.
  • the fixed half moulding tool 13 is heated by either hot oil, electrical heaters or other externally controlled means and contains the runners 2 through which thermoplastic material may flow.
  • One end of the runner system is connected to a nozzle 20 (shown in Figure 3) which acts as a connection between the mould and the plasticizing screw mechanism 8 of the injection moulding machine.
  • the other end of the runner system is connected to the gates 3, which are valved orifices through which thermoplastic material in the runner system passes into the mould cavity under pressure, generated in the injection-moulding machine.
  • the runner system within the mould is heated by external heaters to a specified temperature, for a given thermoplastic, at which the thermoplastic will readily flow.
  • the valved gates are also heated to a temperature at or close to the melt temperature at which the given thermoplastic material readily flows as explained in greater detail below.
  • the fixed half moulding cavity tool 13 is normally bolted or otherwise attached directly to a fixed platen on the injection-moulding machine.
  • the moving half moulding cavity tool 15 which is heated by either hot oil or electrical heaters or other externally controlled means is fixed to a moving platen on the injection moulding machine such that when the moving platen is closed onto the fixed platen, the two halves of the mould cavity are accurately located together under a force great enough to resist opening pressures created by the act of injecting thermoplastic material into the mould cavity.
  • the mould core which can be heated or unheated, fits into the mould cavity formed by the closed fixed and moving mould cavity halves such that the remaining void within the assembly is in the form of the article to produced (in this instance a glove) by injecting thermoplastic material into the void.
  • materials are injected into the mould cavity via a gate.
  • the gate is located at an appropriate part of the cavity tool in order to ensure that the cavity is fully filled with polymer material .
  • the pressure at which the polymer material is injected and the time taken to fill the cavity before the polymer solidifies within the cavity are important factors. Another factor in these events is the viscosity of the material being injected. Generally, the higher the material viscosity, the higher the injection pressure required.
  • Flow Ratio maximum flow path from the gate cavity thickness
  • Flow Ratio 500:1.
  • a Flow Ratio of 500:1 would be considered to be very high compared to often used Flow Ratios in the range 10:1 to 50:1.
  • the tool cavity (or melt channel) is simply too narrow to be filled reliably via a single gate since the material viscosity and the injection pressures required are too high to be practical.
  • injection-moulding techniques can be used for moulding thin walled large surface area articles by careful manipulation of the operational parameters of the moulding apparatus preferably in conjunction with closed loop computer control of the process .
  • injection pressures and tool clamping forces may be reduced to acceptable limits for component production.
  • the co-polymer materials in question comprised two main components, these being a Styrene component and an Elastomer component.
  • a Styrene component and an Elastomer component.
  • Elastomer component elastomer component
  • many other groups of suitable co-polymers exhibit similar properties, for example, co-polymers based on polyurethane components .
  • the Styrene component resides in hard, crystalline domains within the polymer structure acting as a physical crosslink, whilst the Elastomer component forms the continuous elastomeric phase.
  • the Styrenic domains will soften and flow under the influence of heat and shear forces, temporarily disrupting the physical crosslink and allowing thermoplastic compounding and fabrication, including injection moulding. Upon cooling, the domains reform and the elastomeric character of the material is restored within its newly formed shape.
  • the no-flow temperature is a measure of the polymer solidification temperature. Similar to viscosity measurements, NFT is derived with the use of an Acer 2000 series capillary rheometer. In order to determine values of NFT, the following recognised test is carried out. First, an initial test temperature is set at a value 10 Celsius above the estimated NFT for the material's generic type. A barrel of a rheometer is filled with the polymer sample. This is achieved by repeatedly placing material in the barrel and tamping down with the piston until the barrel is completely full. The sample is then left for fifteen minutes to heat up and for the temperature to stabilise.
  • the barrel piston is then advanced until a pressure of 50MPa is registered at a transducer and a die exit is inspected for any sign of extrudate. If extrudate is present the piston pressure is reduced and the temperature of the material reduced incrementally. The sample is left for a further fifteen minutes to allow system stabilisation. The procedure is repeated until a temperature is reached at which no extrudate is evident at the capillary die exit. This temperature is designated as the no-flow temperature.
  • the rate at which the material cools down within mould cavity is reduced, meaning that the material can be urged further into the mould cavity, the viscosity of the material being a function of its temperature and the shear forces exerted upon it .
  • the moulding tool parts are heated.
  • the moulding tool parts are kept at a lower temperature than the optimum flow temperature of the injected material.
  • the applicants have configured the gates 3 such that they incorporate heating means 21 within the valve body 11, which heats the injection material above the temperature of the surrounding moulding tool parts, the valve body being separated from the moulding tool parts by cooling means 22 in the insert 12 so as not to substantially affect the temperature of the adjacent moulding tool parts and thereby reduce the effectiveness of the stripping process once the article has been formed.
  • the valve body 11 is further insulated from the insert 12 by way of an air gap 23. Hence, as the injection material approaches the mould cavity it is heated by way of the heating means 21 in the valve body 11, such heating being localised to avoid undesirable effects on the adjacent moulding tool parts.
  • Thermocouples 24 and 25 are used to carefully monitor the respective temperatures of the valve body and the insert, their outputs being fed to control means for monitoring and adjusting the temperature of the gate components via the heating and cooling means in a closed loop control system.
  • the heating means and cooling means may take any suitable form and in the present example comprise oil and water channels respectively.
  • the applicants have considered different injection velocities in relation to the manufacture of ultra- thin walled articles.
  • the applicants have found that with the relatively high temperature moulding tool parts described above, it is beneficial to have the injection velocity relatively high.
  • the extent to which the injected material cools down during the filling of the cavity is not sufficient to adversely affect its properties.
  • the material is injected too slowly, it cools to an extent where its flow properties begin to change such that the forces urging it into the cavity cause the injected material to pack in the cavity. This is not desirable in that once stripped from the cavity, such packed material will expand to a finished size considerably larger that the mould cavity in which it was formed.
  • suitable injection materials are Styrenic Block Co-Polymers, for example SBS (Styrene Butadiene Styrene) .
  • SBS Styrene Butadiene Styrene
  • a suitable injection velocity is lOOOmm/s.
  • a suitable material injection temperature is 200-220 Celsius
  • a suitable moulding tool part temperature is 100 Celsius
  • a suitable valve body temperature is 200-220 Celsius.
  • welds form within the surfaces of the moulded article at positions directly related to the relative positions of the gates and the rate of flow of material through said gates .
  • the effect is that the weld line X-X would move closer to the gate 31 but would still be normal to a line representing the shortest distance between the two gates 30 and 31.
  • This effect is caused by the flow front emanating from gate 30, progressing further than the flow front emanating from gate 31 at the time the two flow fronts become co- incident and a weld begins to form.
  • These additional coatings may be applied by dipping, spraying, printing techniques or other depository techniques.
  • the cavity space between the mould cavity and the mould core may be manufactured to be of varying thickness, it follows that a mould assembly may be manufactured to produce gloves or other products whereby the thickness, in terms of cross section through the wall of the product, may be varied.
  • a glove or other product may be manufactured to be of specific varying or uniform wall thickness at any point on the product surface in a single stage manufacturing process .
  • a mould assembly may be manufactured to produce gloves or other products whereby the surface finish at any point across any surface of the product may be varied.
  • the present invention allows each surface of the article to be configured as desired, it lends itself particularly to lamination techniques, whereby different materials, exhibiting different properties, can be provided at different locations and/or different surfaces of the article.
  • an internal layer may be formed of a soft material with slight indentations to enhance comfort and donning thereof, whereas the outside surface may be a resilient protective layer to resist impingement by sharps.
  • specific areas, such for example as the finger ends can be provided with resilient layers to provide protection in those areas without compromising the overall flexibility of the glove.
  • Such lamination means are well known in the art and are generally provided between the nozzle of the injection screw and the hot runners in the fixed moulding tool part .

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

Abstract

L'invention concerne un procédé de moulage par injection d'articles à parois ultra-fines, du type gant (1), dont l'épaisseur varie entre 0,01 et 2,5 millimètres. Le procédé consiste à injecter du matériau plastifié dans un moule, puis à séparer du moule l'article moulé, le moule étant caractérisé en ce que sa température est maintenue au-dessus de la température d'absence d'écoulement du matériau plastifié tout au long de l'injection dudit matériau et de la séparation de l'article par rapport au moule. L'invention concerne en outre des techniques associées au moulage par injection, comme la stratification, la production de finis de surface travaillés ou de variations d'épaisseur localisées, pour les besoins de l'élaboration d'articles à fines parois.
PCT/GB1998/003452 1997-12-16 1998-11-17 Moulage par injection d'articles a fines parois Ceased WO1999030892A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11667/99A AU1166799A (en) 1997-12-16 1998-11-17 Injection moulding of thin walled articles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9726447.7A GB9726447D0 (en) 1997-12-16 1997-12-16 Injection moulded gloves
GB9726447.7 1997-12-16

Publications (1)

Publication Number Publication Date
WO1999030892A1 true WO1999030892A1 (fr) 1999-06-24

Family

ID=10823615

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/003452 Ceased WO1999030892A1 (fr) 1997-12-16 1998-11-17 Moulage par injection d'articles a fines parois

Country Status (3)

Country Link
AU (1) AU1166799A (fr)
GB (1) GB9726447D0 (fr)
WO (1) WO1999030892A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002081173A1 (fr) * 2001-04-10 2002-10-17 Kim Patchett Procede de fabrication d'articles a parois minces
WO2009122177A1 (fr) * 2008-04-01 2009-10-08 Reckitt Benckiser N.V. Processus de moulage par injection
WO2010112793A1 (fr) * 2008-04-01 2010-10-07 Reckitt Benckiser N.V. Récipients moulés par injection

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4399093A (en) * 1981-06-26 1983-08-16 Whirlpool Corporation Injection molding method and equipment
EP0202372A1 (fr) * 1985-05-22 1986-11-26 Vyrobni hospodárská jednotka SUPRAPHON oborovy podnik Praha procédé et dispositif pour mouler par injection des matières thermoplastiques
EP0335388A2 (fr) * 1988-03-31 1989-10-04 Fritz Müller Procédé de moulage par injection pour matières plastiques et moule d'injection
EP0361043A2 (fr) * 1988-09-30 1990-04-04 Jobst Ulrich Gellert Buse d'injection ayant une partie du bec avec élément de chauffage entourant l'alésage et procédé
EP0362648A2 (fr) * 1988-10-06 1990-04-11 Bayer Ag Procédé pour fabriquer des pièces moulées
JPH04364919A (ja) * 1991-06-12 1992-12-17 Sumitomo Jukikai Plast Mach Kk 射出成形機の制御方法
WO1994014589A1 (fr) * 1992-12-24 1994-07-07 Smith & Nephew Plc Moulage par injection
EP0688656A1 (fr) * 1994-06-21 1995-12-27 Jobst Ulrich Gellert Insert de moulage par injection en une seule pièce avec chambre de refroidissement comprenant des nervures radiales
EP0700764A1 (fr) * 1990-06-21 1996-03-13 Fuji Photo Film Co., Ltd. Cassette à disque magnétique et son procédé de fabrication
WO1998022275A1 (fr) * 1996-11-22 1998-05-28 Ethicon, Inc. Procede et appareil de fabrication d'un article barriere a paroi mince

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4399093A (en) * 1981-06-26 1983-08-16 Whirlpool Corporation Injection molding method and equipment
EP0202372A1 (fr) * 1985-05-22 1986-11-26 Vyrobni hospodárská jednotka SUPRAPHON oborovy podnik Praha procédé et dispositif pour mouler par injection des matières thermoplastiques
EP0335388A2 (fr) * 1988-03-31 1989-10-04 Fritz Müller Procédé de moulage par injection pour matières plastiques et moule d'injection
EP0361043A2 (fr) * 1988-09-30 1990-04-04 Jobst Ulrich Gellert Buse d'injection ayant une partie du bec avec élément de chauffage entourant l'alésage et procédé
EP0362648A2 (fr) * 1988-10-06 1990-04-11 Bayer Ag Procédé pour fabriquer des pièces moulées
EP0700764A1 (fr) * 1990-06-21 1996-03-13 Fuji Photo Film Co., Ltd. Cassette à disque magnétique et son procédé de fabrication
JPH04364919A (ja) * 1991-06-12 1992-12-17 Sumitomo Jukikai Plast Mach Kk 射出成形機の制御方法
WO1994014589A1 (fr) * 1992-12-24 1994-07-07 Smith & Nephew Plc Moulage par injection
EP0688656A1 (fr) * 1994-06-21 1995-12-27 Jobst Ulrich Gellert Insert de moulage par injection en une seule pièce avec chambre de refroidissement comprenant des nervures radiales
WO1998022275A1 (fr) * 1996-11-22 1998-05-28 Ethicon, Inc. Procede et appareil de fabrication d'un article barriere a paroi mince

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Title
A. GRAF: "Verfahrens- und Werkzeugauslegung beim Spritzgiessen dünnwandiger Elastomerartikel", KUNSTSTOFFBERATER., vol. 30, no. 7/8, July 1985 (1985-07-01) - August 1985 (1985-08-01), pages 31 - 33, XP002094512 *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 237 (M - 1408) 13 May 1993 (1993-05-13) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002081173A1 (fr) * 2001-04-10 2002-10-17 Kim Patchett Procede de fabrication d'articles a parois minces
WO2009122177A1 (fr) * 2008-04-01 2009-10-08 Reckitt Benckiser N.V. Processus de moulage par injection
WO2010112793A1 (fr) * 2008-04-01 2010-10-07 Reckitt Benckiser N.V. Récipients moulés par injection
CN101983120A (zh) * 2008-04-01 2011-03-02 雷克特本克斯尔荷兰有限公司 注射成型方法
US8669220B2 (en) 2008-04-01 2014-03-11 Reckitt Benckiser N.V. Injection moulded containers
EP2271473B1 (fr) 2008-04-01 2018-11-14 Reckitt Benckiser Finish B.V. Processus de moulage par injection

Also Published As

Publication number Publication date
AU1166799A (en) 1999-07-05
GB9726447D0 (en) 1998-02-11

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