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WO1994014589A1 - Moulage par injection - Google Patents

Moulage par injection Download PDF

Info

Publication number
WO1994014589A1
WO1994014589A1 PCT/GB1993/002624 GB9302624W WO9414589A1 WO 1994014589 A1 WO1994014589 A1 WO 1994014589A1 GB 9302624 W GB9302624 W GB 9302624W WO 9414589 A1 WO9414589 A1 WO 9414589A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
core
hand
injection
injection mould
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/GB1993/002624
Other languages
English (en)
Inventor
Peter John Warren
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.)
Smith and Nephew PLC
Original Assignee
Smith and Nephew PLC
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
Priority claimed from GB929226908A external-priority patent/GB9226908D0/en
Priority claimed from GB939319176A external-priority patent/GB9319176D0/en
Application filed by Smith and Nephew PLC filed Critical Smith and Nephew PLC
Priority to AU57091/94A priority Critical patent/AU5709194A/en
Publication of WO1994014589A1 publication Critical patent/WO1994014589A1/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
    • B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D19/00—Gloves
    • A41D19/0055—Plastic or rubber gloves
    • A41D19/0058—Three-dimensional gloves
    • A41D19/0062—Three-dimensional gloves made of one layer of material
    • 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
    • B29C2045/2695—Moulds injecting articles with varying wall thickness, e.g. for making a tear line
    • 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
    • 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
    • B29L2031/753—Medical equipment; Accessories therefor
    • B29L2031/7538—Condoms

Definitions

  • the invention relates to elastomeric articles and to an injection moulding apparatus for the production of such articles and in particular but not exclusively to the production of thin walled articles such as - • gloves.
  • Elastomeric articles such as gloves
  • gloves are usually produced by a dipping process which enables such articles to be produced easily with an even wall
  • the present invention seeks to overcome the above 20. mentioned disadvantages by manufacturing articles, such as gloves from a novel injection moulding apparatus.
  • an injection mould for the manufacture of an -5. article comprising an inner core and cooperatingly shaped outer mould, the core and mould being adaptable to define a gap a substantial portion of which has a width not greater than 0.7mm.
  • the core and the mould For use in injection moulding the core and the mould must be locked together.
  • the core and the mould may be machined such that when the core and the mould are locked together a substantial portion of the gap between the inner core and the outer mould will be not greater than 0.7mm in width.
  • articles we would include in particular, elastomeric articles and especially thin walled elastomeric articles, such as gloves, condoms, bellows and other known thin walled elastomeric products.
  • the present invention is however particularly concerned with gloves.
  • a substantial portion of the gap defined by the inner core and cooperatingly shaped outer mould is less than 0.7mm and most desirably not less than 0.05mm.
  • the gap width may be from 0.3mm to 0.7mm, preferably 0.3 to 0.6mm, eg. 0.35 to 0.55mm. Indeed, injection moulds with a gap width of either 0.35 or 0.55mm are preferred.
  • the gap width may be from 0.3mm to 0.7mm, preferably 0.3 to 0.6mm, eg. 0.35 to 0.55mm.
  • injection moulds with a gap width of either 0.35 or 0.55mm are preferred.
  • the gap width may be substantially less, eg. less than 0.25mm, preferably from 0.05 to 0.2mm, eg. 1.0mm.
  • articles which do not require the strength of gloves may be made from an injection 25. mould where the gap width is less than 0.3mm.
  • articles such as condoms may be made using a gap width of from 0.05mm to 0.3mm, eg. 0.05 to 2.0mm.
  • the cooperatingly shaped outer mould is preferably in two halves having a male and female half so that when the article has been formed the two halves of the outer mould may be easily parted and thus the article produced may be removed.
  • the inner core is most desirably in the form of a core hand having cuff, hand and finger portions.
  • the core may be a shape suitable for the production of condoms, bellows, diaphragms, other elastomeric medical products or any other shape
  • an injection mould for the manufacture of a glove comprising an inner core and a
  • the injection mould is provided with an injection port and may be
  • the injection mould of the present invention may be provided with r - means for enhancing the dispersion of the injected material.
  • the dispersion may be enhanced by having a gap width which may be increased near the injection port.
  • Such increased gap width may be greater than
  • the increased gap width may of course be less than 0.7mm depending upon the gap width of the remainder of the injection mould.
  • increased gap width may extend away from the injection port such that it may define a path along which the injected material may travel thus enhancing the dispersion of the injected material.
  • the dispersion means preferably comprises a ⁇ . depressed region or regions of the injection mould which regions provide a greater gap width between the inner core and the outer mould.
  • the depressed regions may be machined into the inner core or into the outer mould or both.
  • the depressed regions may be achieved by machining the inner core such that the gap width between the inner core and the outer mould in the depressed regions is greater than 0.7mm.
  • this method also provides the advantage that gloves of variable thickness may be formed, ie. the palm or back of the hand of the glove may be thicker than the finger -• portions.
  • the finger portions may be provided with a gap of less than 0.55mm and the hand portion provided with a gap between
  • a further alternative may be the finger portions being provided with a gap of 0.35mm and the hand portion be provided with a gap of 0.7 to 0.8mm. It may be possible to provide a gap of less than 0.35mm, the minimum gap possible being dependent on the
  • the finger portions may be provided with a gap of less than 0.25mm and the hand portion provided with a gap between 0.25 and 0.35mm.
  • a further alternative may be the finger portions being provided with a gap of 0.1mm and the hand portion be provided with a gap of 0.15 to 0.35mm. It may be possible to provide a gap of less than 0.1mm, the minimum gap possible being dependent on the accuracy of the mould. In order to have a very small gap and thus an product with an exceedingly thin wall, pressure must be evenly distributed over the core so that there is no distortion thereof and so that the injected material is evenly distributed. These combinations provide additional strength to the part of the hand, that is the palm, which is placed under the greatest load when donning a glove and which is at risk of tearing.
  • the gaps may be of varying widths all across the mould, providing a difference in thickness of the wall of the product in any required area dependent upon the
  • the depressed regions may comprise narrow areas through which injected material may flow.
  • regions may be substantial areas, alternatively, the depressed regions may be in the form of narrow channels or runners.
  • the means to disperse the injected material is aptly in the form of runners which may radiate throughout the injection mould to spread the
  • the runners are most desirably machined onto the inner core of the injection mould and in the case where the core is a core hand the runners may radiate out 25. from the palm of the hand or from the cuff.
  • the front and back portion of a hand core there may be a different arrangement of runners across the front and back portion of a hand core.
  • the front that is the palm of 30.
  • the hand core is most preferably free from runners along the finger portions and the part of the palm immediately adjacent the finger portions to provide ease of use of the glove by a wearer.
  • the front of the hand may have an area across the palm which is provided with a gap of greater thickness than that of the finger portions. This area of the palm may aptly have a series of runners radiating from the cuff.
  • the back of the hand may have various combinations of runners over areas where the gap is of variable thickness.
  • a runner preferably extends along each finger to assist in spreading the injected
  • runners may be tapered towards the fingertips of the core hand so that the material is spread uniformly over mould.
  • runners may aptly be from 1 to 6mm in width and may be from 0.5 to 3mm in depth and may taper down to zero as the runner extends along the finger portions to the fingertips.
  • a further alternative may be to provide annular runners, in the case of a core hand, around
  • each finger to assist the flow of the material and to aid in the alignment of the core hand within the cooperatingly shaped mould by providing a means of rapidly spreading the material across the mould and thus evenly distributing the pressure across the mould.
  • annular runners may be provided by themselves or may alternatively be provided in addition to the runners which extend along each finger.
  • the runners may also serve to provide reinforcement ribs in the articles produced.
  • the runners may also be adapted so as to provide a cuff-locking means which allows the glove cuff to be folded over to fit more securely around the wrist of the wearer.
  • thickness, of from 0.25 to 0.8mm and the finger portions have a thickness of from 0.1 to 0.35mm.
  • the hand and cuff portions 20 may preferably have a thickness of 0.5 to 0.8mm, preferably 0.6 to 0.8mm and especially 0.7 to 0.8mm.
  • the finger portions may have a thickness of from 0.35mm to 0.55mm.
  • the hand and cuff portions may have a thickness of from 0.15 to 0.35mm, preferably 0.25 to 0.35mm, whilst the finger portions may have a thickness of from 0.05 to
  • 0.25mm preferably from 0.1 to 0.25mm.
  • the gloves When the gloves are manufactured from injection moulds comprising runners in the core of the mould, the gloves may be characterised in that they will be provided with ribs corresponding to the runners in injection mould. These ribs will vary according to the variance of the mould runners but it is preferable that each finger portion will be provided with a rib along a substantial part of it's length. The ribs will generally be on the inside of the glove, thus if the runner is in the mould, the gloves will be inverted on removal from the core.
  • a glove comprising cuff, hand and finger portions wherein each finger portion is provided with a rib along a substantial part of it's length.
  • elastomeric gloves eg. flexible elastomeric gloves.
  • the ribs correspond to the runners, they are not limited to the finger portions but may also be 20. provided on the hand and/or cuff portions.
  • Materials which may be used for the production of articles by this method of injection moulding are preferably flexible synthetic polymers, optionally
  • gloves comprising a synthetic polymer containing particulate tungsten may be prepared without the requirement of a multilayer glove and considerably thinner than known x-ray resistant gloves.
  • a preferred material 10 is that comprising at least 25% by volume of particulate tungsten material, eg. an ethylene propylene or ethylene propylene diene copolymer material.
  • the material may be a flexible elastomeric polymer which is not loaded with tungsten.
  • the material used may be natural polymers, such as latex materials.
  • non-latex materials may be flexible synthetic elastomers, eg. polyurethane
  • thermoplastics such as polyvinyl chloride or polypropylene.
  • thermoplastic elastomers for example polyetherester block copolymers such as Hytrel (TM) , Geolast (TM) , Santoprene (TM) or Alcryn (TM) .
  • the core and cooperatingly shaped mould will be used conventionally in accordance with injection moulding techniques in which the conditions such as fluid pressure, temperature, clamping pressure, speed of injection, may vary in accordance with the size of
  • a preferred injection moulding • machine may have a clamp force of up to 450 tonnes, a pot volume of 250cm 3, and an i.nj.ecti.on pressure of up to 3200 bar.
  • a method of prophylaxis of x-ray induced disorders such as arthritis or leukaemia by the use of an article, a substantial portion of which has a thickness of not greater than 0.7mm and
  • Figure 2 represents a plan view of a back part of a core hand according to a first embodiment of the invention
  • Figure 3 represents a sectional view through a finger portion of Figure 2 ;
  • Figure 4 represents a plan view of a front part of a core hand of Figure 2;
  • Figure 5 represents a plan view of a back part of a 15. core hand according to a second embodiment of the invention.
  • Figure 6 represents a plan view of a front part of a core hand of Figure 4.
  • an injection mould generally designated 10 having a inner core hand 12 and co-operatingly shaped male and female outer mould 14 and 16.
  • the male and female moulds 14 are provided.
  • 25. and 16 are internally shaped in the.form of two halves of a hand which co-operate with the core hand 12 when the core hand is place within the male and female mould 14 and 16.
  • FIG. 2 there is illustrated the back part 11 of a core hand 12 of the injection mould generally designated 10 having a cuff 18 and at an opposing end thereof fingers generally designated.20.
  • the core hand 12 is provided with runners 22 which are machined into the core to provide a pathway for dispersing a material injected into the mould 10.
  • Each finger portion 20 is provided with a respective runner -• generally designated 22 which radiate from an area 24 providing a uniform gap between the core hand 12 and co-operatingly male moulds 14 and 16.
  • Figure 4 illustrates a front part 26 of a core 10.
  • hand 12 having a uniform channel 28 extending from the cuff 18 which enables the injected material to be spread across the injection mould 10 without the use of runners which are provided only on the back part 11 of the core hand 12.
  • the absence of the runners on the 15. front part 26 of the core hand 12 enables the wearer of a glove produced to have greater manipulation without having the protruding ribs caused by the runners 22.
  • Figure 5 and 6 illustrate a second embodiment 20. of the invention like numerals being provided for like features to those of embodiment one.
  • a back part 11 of a core hand 12 which has a cuff 18 and at an opposing end thereof fingers generally designated 20.
  • Radiating from an edge of the cuff 18 25. are a plurity of runners generally designated 32.
  • a runner 32 being provided for each respective finger 20, the runners 32 extending from the edge of the cuff 18 to the tips of the fingers 20 to ensure that an injected material disperses around the whole injection 30. mould 10.
  • a front part 26 of a core hand 12 which again is provided with a cuff 18 and fingers 20 and radiating from the cuff 18 are a plurity of runners 36 which extend towards the palm of the core hand 12 but do not extend as far as the start of the fingers 20.
  • the core hand 12 is suspended within - • the co-operatingly shaped male mould 16 which may be fixed in position.
  • the co-operatingly shaped female mould 14 is then placed over the core hand 12 so as to engage the male mould 16.
  • the core 12 and the male and female moulds 14 and 16 are positioned so as to define 10. a gap 9 as shown in Figure 1.
  • the material to be injected is then fed into the injection mould using conventional injection moulding techniques such as a reciprocating screw, under a pressure approximately 230 Mega Pascals (the fluid pressure of the injected melt) . 15.
  • the female mould 14 is removed and the core hand 12 lifted away from the male mould 16.
  • the resulting glove (not shown) is then 20. peeled off the core hand, thus the runners (16,32) forming ribs on the outer surface of the glove produced.

Landscapes

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

Abstract

L'invention se rapporte à des articles élastomères à parois minces, en particulier à des gants, ainsi qu'à un procédé de fabrication de tels articles par moulage par injection. De nouveaux moules à injection devant être utilisés selon ce procédé sont également décrits.
PCT/GB1993/002624 1992-12-24 1993-12-22 Moulage par injection Ceased WO1994014589A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57091/94A AU5709194A (en) 1992-12-24 1993-12-22 Injection moulding

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB929226908A GB9226908D0 (en) 1992-12-24 1992-12-24 Injection moulding
GB9226908.3 1992-12-24
GB939319176A GB9319176D0 (en) 1993-09-16 1993-09-16 Injection moulding
GB9319176.5 1993-09-16

Publications (1)

Publication Number Publication Date
WO1994014589A1 true WO1994014589A1 (fr) 1994-07-07

Family

ID=26302219

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/002624 Ceased WO1994014589A1 (fr) 1992-12-24 1993-12-22 Moulage par injection

Country Status (2)

Country Link
AU (1) AU5709194A (fr)
WO (1) WO1994014589A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998022275A1 (fr) * 1996-11-22 1998-05-28 Ethicon, Inc. Procede et appareil de fabrication d'un article barriere a paroi mince
WO1999030892A1 (fr) * 1997-12-16 1999-06-24 Kim Patchett Moulage par injection d'articles a fines parois
AU2002225105B2 (en) * 2000-12-22 2004-10-21 Mastrad Protective glove
CN100404228C (zh) * 2005-02-28 2008-07-23 陆培功 橡胶注塑胶面靴的制造工艺
CN101913226A (zh) * 2010-08-25 2010-12-15 天津市腾盛橡塑制品厂 橡塑电绝缘手形手套、胶靴的注射成型方法
US10271597B2 (en) 2007-07-16 2019-04-30 Madgrip Holdings, Llc Utility glove
US10420382B2 (en) 2007-07-16 2019-09-24 Madgrip Holdings, Llc Utility glove
FR3134503A1 (fr) * 2022-04-15 2023-10-20 Philippe Paul André BORNAIS Florian Gant moulé et procédé de fabrication associé

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1038897A (en) * 1964-03-12 1966-08-10 Metal Box Co Ltd Improvements in or relating to plastics containers
US3283338A (en) * 1965-09-09 1966-11-08 Landau Lucian Glove construction for providing comfort to the wearer
US4117950A (en) * 1977-10-19 1978-10-03 Buckeye Molding Company Plastic closure
US4743420A (en) * 1986-09-16 1988-05-10 Sun Coast Plastics, Inc. Method and apparatus for injection molding a thin-walled plastic can
EP0342470A1 (fr) * 1988-05-18 1989-11-23 Siemens Aktiengesellschaft Gaut en particulier pour une boîte à gants contenant des substances radioactives et son procédé de fabrication
WO1993002457A1 (fr) * 1991-07-16 1993-02-04 Smith & Nephew Plc Gant de protection contre les rayonnements

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1038897A (en) * 1964-03-12 1966-08-10 Metal Box Co Ltd Improvements in or relating to plastics containers
US3283338A (en) * 1965-09-09 1966-11-08 Landau Lucian Glove construction for providing comfort to the wearer
US4117950A (en) * 1977-10-19 1978-10-03 Buckeye Molding Company Plastic closure
US4743420A (en) * 1986-09-16 1988-05-10 Sun Coast Plastics, Inc. Method and apparatus for injection molding a thin-walled plastic can
EP0342470A1 (fr) * 1988-05-18 1989-11-23 Siemens Aktiengesellschaft Gaut en particulier pour une boîte à gants contenant des substances radioactives et son procédé de fabrication
WO1993002457A1 (fr) * 1991-07-16 1993-02-04 Smith & Nephew Plc Gant de protection contre les rayonnements

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Chemikalienbeständige Schutzhandschuhe aus Fluorelastomer", PLASTVERARBEITER, vol. 42, no. 11, November 1991 (1991-11-01), SPEYER/RHEIN DE, pages 146 - 147 *
GRAF: "Verfahrens- und Werkzeugauslegung beim Spritzgiessen dünnwandiger Elastomerartikel", KUNSTSTOFFBERATER, vol. 30, no. 7/8, ISERNHAGEN DE, pages 31 - 33, XP002094512 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998022275A1 (fr) * 1996-11-22 1998-05-28 Ethicon, Inc. Procede et appareil de fabrication d'un article barriere a paroi mince
WO1999030892A1 (fr) * 1997-12-16 1999-06-24 Kim Patchett Moulage par injection d'articles a fines parois
AU2002225105B2 (en) * 2000-12-22 2004-10-21 Mastrad Protective glove
CN100404228C (zh) * 2005-02-28 2008-07-23 陆培功 橡胶注塑胶面靴的制造工艺
US10271597B2 (en) 2007-07-16 2019-04-30 Madgrip Holdings, Llc Utility glove
US10362818B2 (en) 2007-07-16 2019-07-30 Madgrip Holdings, Llc Utility glove
US10420382B2 (en) 2007-07-16 2019-09-24 Madgrip Holdings, Llc Utility glove
CN101913226A (zh) * 2010-08-25 2010-12-15 天津市腾盛橡塑制品厂 橡塑电绝缘手形手套、胶靴的注射成型方法
FR3134503A1 (fr) * 2022-04-15 2023-10-20 Philippe Paul André BORNAIS Florian Gant moulé et procédé de fabrication associé

Also Published As

Publication number Publication date
AU5709194A (en) 1994-07-19

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