What is coagulant for glove?
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.
How calcium nitrate coagulate the latex?
The calcium nitrate (called coagulant) causes the latex particles to aggregate onto the former forming a weak, water containing film described in the industry as wet gel. Upon removal and subsequent drying the film transforms into the glove, which is then removed from the former and packaged.
How do you stop pinholes in gloves?
Lowering the ‘curing temperature profile’ and ‘latex temperature in dip tank’ while increasing the ‘oven temperature before latex dip’ and high humidity with low latex temperature will minimize the pinhole defect (Wahid 1998; Wahid & Tham 2012).
Can blood go through latex gloves?
Only four brands of sterile latex surgeon’s gloves proved nonpermeable to water and blood. Other brands showed leakage that ranged from 1% to 52%.
What causes pinhole in gloves?
Pinholes in thin gloves are unavoidable – but why? Gloves are made by dipping ceramic formers into a tank of liquid Latex. Any air bubble attached to a former can cause a thin spot in the latex film that can turn into a pin hole. No producer in the world can guarantee that their gloves are free from pin holes.
What is coagulant dipping process?
The coagulant dipping process is the most commonly used process. The former is dipped into the coagulant solution, withdrawn and dipped into the latex compound during a suitable dwell time. The former is then slowly withdrawn, inverted and dried. Thickness is about 0.15-0.30 x 10-3m.
How does latex coagulate?
When latex is exposed to air, bacteria from the air slowly attack the protein membrane to produce lactic acid. The lactic acid helps to coagulate the latex.
What does coagulant mean?
Coagulant meaning A substance that brings about coagulation. noun. An agent that causes a liquid or sol to coagulate.
What is compounding in glove manufacturing?
During the glove manufacturing process, chemicals are added, including accelerators (to help control the later vulcanisation process) and antioxidants (to prevent deterioration of the rubber molecules in the final product by heat, moisture and ozone).
What is latex dipping?
In its simplest form, latex dipping is a process in which thin-walled polymer (usually rubber) products are produced by first immersing a former in a latex which has been suitably compounded, and then subsequently slowly withdrawing the former from the latex in such a way as to leave a uniform deposit upon the former.
How are nitrile gloves manufactured?
The synthetic rubber is delivered to glove manufacturers as a dried, crumbled material. The manufacturers make the crumbled synthetic rubber into liquid again and then reshape it into gloves. They do this by placing molds of human hands on a conveyor and coating them so the nitrile does not stick.
What is the composition of the coagulant in gloves?
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.
What is the coagulant in latex film?
It is noted that the coagulant usually the metal salt of a stearate and other chemicals such as wetting agents. Any of these the formation of good latex film later. Thus they need to be completely removed from the
What are the factors that affect the thickness of latex gloves?
The thickness may affect or control by the temperature of the coagulant, duration of dipping [34] and concentration of the coagulant may also affect the thickness of the latex glove. Coating methods such as the hydrogel or any polymer would also affect the -Suitable handling strong organic solvents.
How are latex gloves made?
In glove manufacturing process, a former (mould) is dipped into a coagulant solution and dried before dipping into a latex tank to deposit a thin layer of latex which gels and adheres to
