WO2023140726A1 - Dispositif de formation de céramique et sa méthode de fabrication - Google Patents

Dispositif de formation de céramique et sa méthode de fabrication Download PDF

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Publication number
WO2023140726A1
WO2023140726A1 PCT/MY2022/050032 MY2022050032W WO2023140726A1 WO 2023140726 A1 WO2023140726 A1 WO 2023140726A1 MY 2022050032 W MY2022050032 W MY 2022050032W WO 2023140726 A1 WO2023140726 A1 WO 2023140726A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
sections
section
article
moulding material
Prior art date
Application number
PCT/MY2022/050032
Other languages
English (en)
Inventor
Ravichandran GURUVALU
Original Assignee
Ceramtec Innovative Ceramic Engineering (M) Sdn Bhd
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 Ceramtec Innovative Ceramic Engineering (M) Sdn Bhd filed Critical Ceramtec Innovative Ceramic Engineering (M) Sdn Bhd
Publication of WO2023140726A1 publication Critical patent/WO2023140726A1/fr

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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/16—Slip casting, i.e. applying a slip or slurry on a perforated or porous or absorbent surface with the liquid being drained away
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B42/00—Surgical gloves; Finger-stalls specially adapted for surgery; Devices for handling or treatment thereof
    • A61B42/10—Surgical gloves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F6/00—Contraceptive devices; Pessaries; Applicators therefor
    • A61F6/02—Contraceptive devices; Pessaries; Applicators therefor for use by males
    • A61F6/04—Condoms, sheaths or the like, e.g. combined with devices protecting against contagion
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0022—Multi-cavity moulds
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0061—Moulds or cores; Details thereof or accessories therefor characterised by the configuration of the material feeding channel
    • B29C33/0066—Moulds or cores; Details thereof or accessories therefor characterised by the configuration of the material feeding channel with a subdivided channel for feeding the material to a plurality of locations
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/38—Moulds, cores or other substrates
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0058—Liquid or visquous
    • B29K2105/0064—Latex, emulsion or dispersion
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0094—Geometrical properties
    • B29K2995/0097—Thickness
    • 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

  • This invention relates to a ceramic former for forming thin walled latex articles with uniform wall thickness by slip casting and a method of its manufacture.
  • Thin walled latex products such as gloves or condoms are manufactured by dipping formers into tanks of liquid latex and admixed chemicals.
  • formers used for dip-formed polymeric products uses formers made of wood, ceramic, glass, porcelain, plastic and aluminium.
  • the formers are firstly heated and then dipped into the latex bath, usually fingers first in the case of a glove former, where the latex adheres to the former.
  • the "wet" formers are then dried in a heated oven and the latex cured on the mould.
  • thin-walled latex products For ease of reference, we will refer to thin-walled latex products as glove products. This does not serve to limit the thin-walled latex products to only glove products, as other products such as condoms are applicable.
  • the fingers of a glove former are dipped first into the liquid latex bath, followed by other parts of the former, and the fingers will be the last to be removed from the latex bath. Since the finger section of the glove former enters first into and leaves last from the latex bath, the dwelling time of this section is the longest when compared to other sections of the former. By having more dwelling time in the latex bath, more latex will adhere onto this section, and as a result, the finished article has a non- uniform wall thickness; i.e. being thicker at the finger section and thinnest at the part where the dwelling time of the former is shortest in the liquid latex bath.
  • Ceramic formers are made from a method known as slip casting whereby the moulds used for making the formers are made of plaster of paris.
  • the plaster of paris has a cavity with a negative 3-dimensional configuration of the intended former, and the slip; i.e. clay in the form of a pourable suspension, are poured into the cavity.
  • the water present in the slip will be absorbed by the plaster of paris, leaving a layer or a cake of clay on the cavity wall. Once the preferred thickness of the layer or cake is achieved, the remaining slip is poured from the mould to maintain the desired wall thickness formed.
  • the present invention therefore provides a method of producing a ceramic article with variable wall thickness.
  • Figure 1 is drawing of the cross-sectional view of a former according to an embodiment of the present invention.
  • Figure 2 is a photograph showing a top view of the mouldforming chassis according to an embodiment of the present invention .
  • Figure 3 is a photograph showing a side view of the mouldforming chassis according to an embodiment of the present invention .
  • this invention provides a method of producing a hollow ceramic article with variable wall thickness for producing a thin-walled latex article with uniform wall thickness .
  • a mould or mould halves for a negative 3-dimensional configuration of the desired article is made from plaster of paris.
  • the mould of this invention has different rates of water absorption at different parts or sections of the mould, thereby enabling formation of glove former with different wall thickness .
  • This mould is achieved by firstly forming different sections of the mould separately with different mould material, namely the admixtures of plaster of paris for each section.
  • the mould is formed in a chassis (10) as shown in Figure 2 and Figure 3.
  • the section that is intended to form a thicker ceramic article may be made of high porosity plaster of paris.
  • Each section is prevented from flowing into other sections by means of a barrier (12) and the plaster of paris admixtures of each section is prevented from setting by constant stirring or vibration.
  • the barriers (12) are then removed to allow the plaster of paris admixtures for limited borderline integration or adhesion between sections moulding admixtures so that all the sections integrally set to form the mould.
  • the barrier (12) that is used to separate the sections of the plaster of paris can be in the form of a cardboard.
  • the barrier can be a thin wall made from the same moulding material admixture, which is to be poured into said sections so that when the plaster of paris admixture sets, the barrier (12) also forms a part of the mould.
  • Another type of barrier that can be used for this purpose is made from a dissolvable material such that the barrier (12) dissolves upon contact with the admixture of moulding material being poured into said sections.
  • the barrier (12) can be inserted into one of the slots (14) in the chassis (10) for partitioning the sections in the chassis (10) .
  • the mould can be formed with two to five sections of different plaster of paris admixtures, depending on the barriers (12) inserted into the chassis (10) for partitioning.
  • the mould or mould/halves made from this method will absorb water at different rates at different sections of the mould, creating a hollow ceramic former (20) with variable wall thickness. Plaster admixture of higher absorption rate will render a thicker wall formation on the former (20) , and vice versa.
  • the thickest part of the former (20) wall will be the part that has the least dwelling time in the latex bath and the thinnest will have the longest dwelling time. The thickest part will have more heat retained for curing purposes.
  • the plaster of paris admixture is a hemihydrate of calcium sulphate (CaSOv ⁇ lhO) .
  • the ratio of calcium sulphate to water can be varied from 2:1 to 1:1. A higher ratio of the calcium sulphate translates into lower absorption rate.
  • a ratio of 1.69: 1 of plaster of paris to water is used for the fingertip section, and a ratio of 1.38:1 used for the shaft end.
  • the ratio of calcium sulphate to water of 2:1 is used for the palm and finger section, and the ratio of plaster to water is 1.6 : 1 for the shaft end or shank section .
  • the walls of the glove former (20) will be thinnest at the fingers section and thickest at the shaft or shank.
  • this former (20) is heated, the heat retained by the former is least at the finger section and most at the shaft.
  • the former is formed in three sections of the finger (22) , palm (24) , and the shank (24) , with the wall thickness highest at the shank (26) section, intermediate thickness at the palm (24) section, and lowest thickness at the finger (22) section.
  • no adjoining line will be visible externally between the adjacent sections of the former (20) with different wall thickness, as the barriers are removed before the mould is set in each section and the entire mould is integrally set together.
  • the thickness of the glove former (20) in different sections are shown below.
  • Table 1 shows the wall thickness of the surgical glove former (20) .
  • Table 2 shows the wall thickness of the examination glove former (20) .
  • the glove former (20) is firstly heated before dipping, fingers first, into a liquid latex bath.
  • the section of the glove former (20) that will be dipped last will be the shaft or shank of the ceramic former (20) .
  • the thicker wall compensates by retaining more heat, thereby allowing more latex to adhere to the ceramic former. The opposite will apply for the fingers section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgery (AREA)
  • Vascular Medicine (AREA)
  • Reproductive Health (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Textile Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un dispositif de formation de céramique pour former des articles en latex à paroi mince ayant une épaisseur de paroi uniforme par coulée en barbotine. L'invention concerne la méthode de fabrication d'un article en céramique creux ayant différentes épaisseurs de paroi au niveau de différentes sections par moulage par coulée en barbotine selon la présente invention comprenant les étapes consistant à préparer un moule en configuration tridimensionnelle négative dudit article, ledit moule comprenant une pluralité de sections, chaque section étant disposée pour contenir un matériau de moulage à l'intérieur de ladite section pour réduire sensiblement le débordement dans des sections adjacentes pendant au moins une période prédéterminée ; ladite pluralité de sections est laissée à durcir pour former ledit moule d'un seul tenant ; permettre au moule durci de sécher ; et couler en barbotine ledit article en céramique creux avec le moule séché.
PCT/MY2022/050032 2022-01-20 2022-04-29 Dispositif de formation de céramique et sa méthode de fabrication WO2023140726A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2022000392 2022-01-20
MYPI2022000392 2022-01-20

Publications (1)

Publication Number Publication Date
WO2023140726A1 true WO2023140726A1 (fr) 2023-07-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2022/050032 WO2023140726A1 (fr) 2022-01-20 2022-04-29 Dispositif de formation de céramique et sa méthode de fabrication

Country Status (1)

Country Link
WO (1) WO2023140726A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5252273A (en) * 1990-05-30 1993-10-12 Hitachi, Ltd. Slip casting method
US6409954B1 (en) * 1999-10-05 2002-06-25 Roto Plastics, Inc. Method of making a rotary molded plastic member with variable wall thickness
GB2424610A (en) * 2005-03-30 2006-10-04 Ceram Res Ltd Forming method
CN215549536U (zh) * 2021-02-01 2022-01-18 蔡灵明 陶瓷手模的分体成型模具

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5252273A (en) * 1990-05-30 1993-10-12 Hitachi, Ltd. Slip casting method
US6409954B1 (en) * 1999-10-05 2002-06-25 Roto Plastics, Inc. Method of making a rotary molded plastic member with variable wall thickness
GB2424610A (en) * 2005-03-30 2006-10-04 Ceram Res Ltd Forming method
CN215549536U (zh) * 2021-02-01 2022-01-18 蔡灵明 陶瓷手模的分体成型模具

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