Abstract:
As latex based product laminated glove is coming under household category use for the heavy
duty purposes and for construction industry. Laminated Rubber sheet is used as a composite to
palm area with textile fabrics (Kevlar, Cotton). The low adhesion causes to separate of
laminated rubber sheet from the fabric and low quality. The emphasis was placed on enhance
the adhesion ability while introducing of new method to incorporate recycled coagulated
centrifuged latex with the laminated rubber sheet manufacturing. The research was conducted at
the Workwear Lanka (Pvt) Ltd at Biyagama. Preliminary trails were based on common formulas
of adhesive and the existing process line. To fix the accurate secondary solvent (SBP) amount
and the accurate viscosity and the TSC of the adhesive, the amounts (SBP) were adjusted into
0ml, 50ml, 100ml, 200ml, 300ml and 400ml. Then modifications of the current process line by
changing smoothing turns (one, two), maturing period (0.24, 48 hours), curing temperature
(120,155,160 Ϲ), time (30,40,90 minutes) and the adhesive formula under different curing
temperatures and times were done using modified adhesive blend to enhance the adhesion.
Adhesion test was done for all experiments. Then the coagulated centrifuged latex (5kg) with
high moisture content was recycled and incorporated it as the filler to the laminated sheet
compound. Mechanical testing, moisture content and rheograph characteristics were measured,
for the incorporated sheet and data were analyzed by using Tukey method and Dunnett test of
MINITAB 16 statistical software. The adhesive blend with 200ml (SBP) has significant
difference (p<0.05) among other treatments and the T16 process line has the significant
different (p<0.05) among other process lines. The high wood resin amount with the lowest
temperature and longest time period has the significant different (p<0.05) between each other
treatment levels. There are no significant differences (P>0.05) the results of mechanical tests,
rheograph characteristics and the moisture content between the existing and the incorporated
laminated sheet. The best conditions for the highest adhesion ability are the 200ml, optimum
SBP amount with 78.7 viscosity and 93.7 TSC value, double time smoothing, 24 hours maturing
period,120 Ϲ low curing temperature, 90 minutes high curing time and with high amount of
wood resin and there is a potential to incorporate of recycled rubber as the cost reduction filler
ingredient.
