Introduction to latex and the rubber industry

Cacioli, Paul

doi:10.1016/s0335-7457(97)80146-3

Cited by 14 publications

(13 citation statements)

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“…Both porcelain and bone china hand molds were used to study rubber latex droplet stability, wettability to contact angle, and film thickness. There are two main kinds of lubricants namely fluid and solid [8,9]. Examples of solid lubricants are solid powders such as talcum or magnesium silicate, graphite, and wax or paraffin used to reduce adherence between the two surfaces.…”

Section: Introductionmentioning

confidence: 99%

Alternative of bone china and porcelain as ceramic hand molds for rubber latex glove films formation via dipping process

Tharasana

Wongaunjai

Sornsanee

et al. 2020

Reviews on Advanced Materials Science

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In general, the main compositions of porcelain and bone china composed of 54-65%wt silica (SiO2), 23-34% wt alumina (Al2O3) and 0.2-0.7%wt calcium oxide (CaO) suitable for preparation high quality ceramic products such as soft-hard porcelain products for teeth and bones, bioceramics, IC substrate and magneto-optoelectroceramics. The quality of ceramic hand mold is depended on raw material and its properties (pH, ionic strength, solid-liquid surface tension, particle size distribution, specific surface area, porosity, density, microstructure, weight ratio between solid and water, drying time, and firing temperatures). The suitable firing conditions for porcelain and bone china hand-mold preparation were firing at 1270°C for 10 h which resulted in superior working molds for making latex films from natural and synthetic rubber. The obtained fired porcelain hand molds at 1270°C for 10 h provided good chemical durability (10%NaOH, 5%HCl and 10%wtNaCl), low thermal expansion coefficient (5.8570 × 10−6 (°C−1)), good compressive (179.40 MPa) and good flexural strength (86 MPa). While thermal expansion coefficient, compressive and flexural strength of obtained fired bone china hand molds are equal to 6.9230 × 10−6 (°C−1), 128.40 and 73.70 MPa, respectively, good acid-base-salt resistance, a smooth mold surface, and easy hand mold fabrication. Both obtained porcelain and bone china hand molds are a low production cost, making them suitable for natural and synthetic rubber latex glove formation.

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Section: Introductionmentioning

confidence: 99%

Alternative of bone china and porcelain as ceramic hand molds for rubber latex glove films formation via dipping process

Tharasana

Wongaunjai

Sornsanee

et al. 2020

Reviews on Advanced Materials Science

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“…Natural rubber latex contains more than 250 polypeptides and at least 60 of which are an indication of immunoglobulin E (IgE) binding properties [1]. The natural rubber is obtained through a rubber tapping process, where it is then collected from the incision made on the bark of the tree and is derived of 34% rubber cis -1, 4polyisoprene, 2 -3 % proteins, 0.1 -0.5 % sterol glycosides, 1.5 -3.5 % resins, 0.5 -1.0 % ash, 1.0 -2.0 % sugars, and 55 -65 % water [2]. The unprocessed latex is contained in an ammonia solution to avoid microorganism growth.…”

Section: Introductionmentioning

confidence: 99%

Protein reduction of natural rubber films through leaching solvent

Yoke

Tangavaloo

et al. 2019

MATEC Web Conf.

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The finished product natural rubber latex gloves consist of latex proteins, which may pose a risk of allergic reactions in some latex-sensitive individuals. The allergic reactions depend on mild exposure to heavy exposure. An alternative solution to allergic users, usage of latex-free gloves are lack of elasticity and less comfort. This study aims to investigate natural rubber films protein reduction via three types of leaching solvent: acetic acid, sodium hydroxide, and ethanol in the leaching process. Then the influence of leaching solvent concentration on the physical properties of natural rubber gloves was analyzed. It was found that the acetic acid performed greater protein reduction effect (30.07%), followed by sodium hydroxide (27.77%), whereas the ethanol was shown to be less significant to protein reduction. All samples were fulfilling the mechanical properties as required in ASTM standard.

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“…In the "material" factor, poor coagulant wetting on formers causes the jagged coagulant allocation, that leads to poor latex pick up during dipping in latex process, which resulted in forming a curve shape in the product after inflation and during usage [1]. Besides, insufficient cleaning of the former may also lead to similar defect [2].…”

Section: Introductionmentioning

confidence: 99%

Coagulant Dipping Time and Temperature Optimisation for Latex Glove Uneven Coating Investigation

Than

Phang

2018

MATEC Web Conf.

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Powdered glove is produced by natural latex with the aid of coagulant. The composition of the coagulant contains wetting agent, calcium nitrate as coagulant and anti-tack agent. Generally wetting agent causes foam and results in uneven wall thickness in glove production. Hence, the objective of this research was to select a suitable wetting agent sample that could be used by the production, as well as optimising the parameter such as temperature of coagulant, weight percentage of wetting agent and coagulant dipping time to reduce the rejection of uneven thickness. This paper presented the preliminary testing including foam height test, cloud point test, wetting agent characterisation and the samples mechanical analysis. Two setting agents (sample T and sample E) were chosen due to its availability in the production line. Throughout the wetting agent characterisation, sample T was preferred compared to sample E due to similar bonding of the wetting agent. The surface tension of coagulant and tensile strength of glove samples meet the glove industry standard at the variation of wetting agent amount. The optimise parameter were at 0.0175 wt% of wetting agent and 5 seconds dipping time at 63 °C. The average thickness of the gloves at this parameter was at 0.09 ± 0.004 mm which is at the acceptable level comparing to 0.1mm thickness of ASTM standard.

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Introduction to latex and the rubber industry

Cited by 14 publications

References 0 publications

Alternative of bone china and porcelain as ceramic hand molds for rubber latex glove films formation via dipping process

Alternative of bone china and porcelain as ceramic hand molds for rubber latex glove films formation via dipping process

Protein reduction of natural rubber films through leaching solvent

Coagulant Dipping Time and Temperature Optimisation for Latex Glove Uneven Coating Investigation

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