WO2019156548A1 - Procédé de fabrication d'au moins deux gants discrets sur un gabarit - Google Patents

Procédé de fabrication d'au moins deux gants discrets sur un gabarit Download PDF

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Publication number
WO2019156548A1
WO2019156548A1 PCT/MY2018/050083 MY2018050083W WO2019156548A1 WO 2019156548 A1 WO2019156548 A1 WO 2019156548A1 MY 2018050083 W MY2018050083 W MY 2018050083W WO 2019156548 A1 WO2019156548 A1 WO 2019156548A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
agent
rubber film
former
donning
Prior art date
Application number
PCT/MY2018/050083
Other languages
English (en)
Inventor
Chong Ban Wong
Seow Wei NG
Chee Kin PHANG
Ching Pang GOH
Kien Ben LIEW
Original Assignee
Top Glove International 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 Top Glove International Sdn Bhd filed Critical Top Glove International Sdn Bhd
Publication of WO2019156548A1 publication Critical patent/WO2019156548A1/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
    • B29C41/08—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder
    • 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
    • B29C41/14—Dipping a core
    • 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
    • B29C41/22—Making multilayered or multicoloured articles
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D19/00—Gloves
    • A41D19/0055—Plastic or rubber gloves
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0064—Producing wearing apparel
    • B29D99/0067—Gloves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • 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

  • Glove manufacturing process has shifted from single former line system to double, even triple former line system so as to increase production capacity.
  • shifting from an existing line requires investment in time, manpower, apparatus and money.
  • the existing glove manufacturing process was modified. This invention provides a method for producing more than one glove on one former, such that production capacity of an existing former line system can be improved without additional investment in apparatus.
  • one of the embodiments of the present invention is a method for producing two discrete gloves on one former, comprising steps of: (a) coating a glove former with a first coagulant and drying thereof; (b) dipping the former in a first compounded rubber comprising an anti-tack agent and forming a first rubber film on the former and partially curing thereof; (c) treating the first rubber film with a first donning agent; (d) coating the first rubber film with a second coagulant and drying thereof; (e) dipping the first rubber film in a second compounded rubber comprising an anti-tack agent and forming a second rubber film on the first rubber film and curing thereof; and (f) treating the second rubber film with a second donning agent and stripping two discrete gloves therefrom, in which the coefficient of friction between the first and second rubber films ranges from 0.39 to 0.54 pk such that they are strippable into discrete gloves thereafter.
  • the method further comprises a step of leaching excess compounded rubber or donning agent on the film.
  • the method further comprises a step of beading cuff region of the rubber film prior to curing.
  • the anti-tack agent is present in an amount of 0.5 to 5 phr in the compounded rubber.
  • the donning agent is a chlorinated or polymeric donning agent.
  • the chlorinated donning agent used comprises at least 400 ppm of chlorine.
  • the polymeric donning agent used comprises 0.5 to 5 wt% of polymer in water.
  • the polymeric donning agent comprises butyl acrylate, acrylate copolymer, methacrylic acid, benzenepropanoic acid, isopropyl alcohol, and potassium hydroxide.
  • the anti-tack agent is a polyolefin-based wax.
  • the method produces a glove having a thickness between 0.01 mm to 3 mm.
  • FIG. 1 shows a flowchart representing the present invention.
  • This invention relates to a method for producing more than one glove on one former.
  • the donning agent and stripping two discrete gloves therefrom in which the coefficient of friction between the first and second rubber films ranges from 0.39 to 0.54 pk such that they are strippable into discrete gloves thereafter.
  • the glove former Prior the step (a), it is preferred that the glove former is clean. Used glove former can be washed with acid, alkaline or neutral type cleaning agent to remove residue or dirt thereon. The washing can be conducted at 50 to 70 °C for a duration of at least 10 seconds. Thereafter, the former is preferably dried and used in step (a).
  • the first coagulant can have the same or different composition to the second coagulant.
  • the first and second coagulant has the same composition. Coagulant comprised of 4 to 20 wt% of calcium nitrate is preferably used.
  • the coagulant may comprised of 0.1 to 3 wt% of a mould releasing agent, such as a stearated-based coagulant, 0.01 to 0.5 wt% of non-ionic surfactant, and 0.01 to 0.2 wt% of pH adjuster.
  • a mould releasing agent such as a stearated-based coagulant, 0.01 to 0.5 wt% of non-ionic surfactant, and 0.01 to 0.2 wt% of pH adjuster.
  • the step of (a) coating a glove former with a first coagulant can be performed at 50 to 60 °C for at least 5 seconds, for instance 30 seconds.
  • the step of (d) coating the first rubber film with a second coagulant can also be performed at 50 to 60 °C for at least 5 seconds, for instance, 30 seconds.
  • the first and second coagulant are preferably dried in an oven at 100 to 180 °C for at least 30 seconds. More preferably, at least 3 minutes.
  • the method in the present invention is able to produce a glove having a thickness between 0.01 mm to 3 mm.
  • the first coagulant composition and working parameters in step (a) can be adjusted to enhance coating of the first compounded rubber thereafter. Further, it ensures easy stripping of the first rubber films from the former.
  • the second coagulant composition and working parameters in step (d) can be adjusted to enhance coating of the second compounded rubber thereafter. Further, in
  • the step of (b) dipping the former in a first compounded rubber comprising an anti-tack agent and forming a first rubber film on the former can be conducted at 25 to 40 °C for at least 5 seconds, for instance for a duration of 5 to 60 seconds.
  • the step of (e) dipping the first rubber film in a second compounded rubber comprising an anti-tack agent and forming a second rubber film on the first rubber film can also be conducted at 25 to 40 °C for at least 5 seconds, for instance 60 seconds. The period of dipping can be adjusted based on desired thickness of the first and second rubber film.
  • the first and second rubber films are preferably cured in an oven at 70 to 150 °C for a duration of at least 3 minutes, such as 3 to 45 minutes.
  • the first rubber film is partially cured in an oven at 70 to 150 °C for a duration of at least 3 minutes, such as 3 to 45 minutes, more preferably for a duration of 5 minutes.
  • the first rubber film is simultaneously cured with the second rubber film in an oven at 70 to 150 °C for a duration of at least 5 minutes, such as 10 to 45 minutes.
  • Such method is able to prevent over-curing of the first rubber film.
  • the first compounded rubber can have the same or different composition to the second compounded rubber.
  • the rubber used can be a natural rubber latex. Alternatively, it can be synthetic rubber selected from copolymer of acrylonitrile and butadiene, carboxylated copolymer of acrylonitrile and butadiene, polyisoprene, polychloroprene, polyurethane, polyvinyl chloride, thermoplastic elastomers, or derivatives thereof.
  • the first and second compounded rubber comprises suitable amount of anti-tack agent selected from polyolefin-based wax. For instance, polyethylenes under the trade name Polywax can be used. More particularly, the anti-tack agent is present in an amount of 0.5 to 5 phr in the compounded rubber. According to the foregoing description, the presence of anti-tack agent in the compounded rubber ensures easy stripping of glove films thereafter.
  • the method comprises the step of (c) treating the first rubber film with a first donning agent and a step of (f) treating the second rubber film with a second donning agent.
  • the step of treating (c) and (f) can be conducted by dipping cured films into a tank containing donning agent at room temperature for a duration of at least 3 seconds, such as 30 seconds.
  • the first donning agent used can have the same or different type to the second donning agent. More preferably, the donning agent used can be a chlorinated or polymeric donning agent.
  • the first or second rubber film can be subjected to drying and cooling steps before being treated with the chlorinated donning agent.
  • the first or second rubber film may not necessarily be subjected to the cooling step before being treated with the polymeric donning agent. Nevertheless, the first or second rubber film may still be subjected to a drying step after treated with polymeric donning agent.
  • the chlorinated donning agent comprising at least 400 ppm of chlorine, more particularly 400 to 1000 ppm of chlorine can be used.
  • polymeric donning agent comprising of 0.5 to 5 wt% of polymer in water can also be used. More particularly, the polymeric donning agent comprises butyl acrylate, acrylate copolymer, methacrylic acid, benzenepropanoic acid, isopropyl alcohol, and potassium hydroxide.
  • Other ingredients of the polymeric donning agent are comprised of silicone, wetting agent, thickener, biocide, pH adjuster, and water.
  • the method further comprises a step of leaching excess chemicals or residues on the first and second rubber films. It can be conducted after the drying or curing steps, and after the steps of treatment with chlorinated or polymeric donning agent.
  • the step of leaching is conducted by washing the rubber films with water at 40 to 70 °C for a duration of at least 15 seconds, such as 300 seconds.
  • the dipping step of (b) and (e) can be adjusted such that cuff regions of the first and second rubber film are having different lengths. For instance, a difference of 1 to 3 cm. In this way, gloves with beading can be separated easily.
  • method further comprises a step of beading cuff region of the first and/or second rubber film prior to curing.
  • the sequence of beading step in the method of the present invention may differ depending on the type of donning agent used.
  • the beading step is conducted before subjecting the first or second rubber film to treatment using chlorinated donning agent.
  • the beading step can be conducted after subjecting the first or second rubber film to treatment using polymeric donning agent.
  • the present invention does not combine or fuse the first and second rubber films during curing step.
  • the steps as disclosed in the foregoing description renders the coefficient of friction (COF) between the first and second rubber films ranges from 0.39 to 0.54 pk such that they do not fuse with each other thence strippable into discrete gloves thereafter.
  • COF coefficient of friction

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gloves (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

La présente invention concerne un procédé de production de plus d'un gant sur un gabarit. Plus particulièrement, le procédé de production de deux gants discrets sur un gabarit comprend les étapes consistant à : (a) revêtir un gabarit d'un premier coagulant et le sécher ; (b) plonger le gabarit dans un premier caoutchouc mélangé comprenant un agent anticollant et former un premier film de caoutchouc sur le gabarit ; (c) traiter le premier film de caoutchouc par un agent d'enfilage chloré et le durcir partiellement ; et (d) revêtir le premier film de caoutchouc d'un deuxième coagulant et le sécher ; (e) plonger le premier film de caoutchouc dans un deuxième caoutchouc mélangé comprenant un agent anticollant et former un deuxième film de caoutchouc sur le premier film de caoutchouc ; (f) traiter le deuxième film de caoutchouc par un agent d'enfilage polymère et le durcir, le coefficient de frottement entre le premier et le deuxième film de caoutchouc allant de 0,39 à 0,54 µk de telle sorte qu'ils sont pelables en gants discrets par la suite.
PCT/MY2018/050083 2018-02-09 2018-11-29 Procédé de fabrication d'au moins deux gants discrets sur un gabarit WO2019156548A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2018700526 2018-02-09
MYPI2018700526 2018-02-09

Publications (1)

Publication Number Publication Date
WO2019156548A1 true WO2019156548A1 (fr) 2019-08-15

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ID=67548028

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2018/050083 WO2019156548A1 (fr) 2018-02-09 2018-11-29 Procédé de fabrication d'au moins deux gants discrets sur un gabarit

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696065A (en) * 1987-03-13 1987-09-29 Barbara Elenteny Peel away multi-layer gloves
US20080306200A1 (en) * 2007-06-11 2008-12-11 Seong Fong Chen Antistatic gloves and process for making same
WO2017087797A1 (fr) * 2015-11-19 2017-05-26 Avent, Inc. Gant à détection de rupture avec un contraste élevé entre la couleur sur le côté enfilage et le côté préhension du gant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696065A (en) * 1987-03-13 1987-09-29 Barbara Elenteny Peel away multi-layer gloves
US20080306200A1 (en) * 2007-06-11 2008-12-11 Seong Fong Chen Antistatic gloves and process for making same
WO2017087797A1 (fr) * 2015-11-19 2017-05-26 Avent, Inc. Gant à détection de rupture avec un contraste élevé entre la couleur sur le côté enfilage et le côté préhension du gant

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