The invention discloses a brown
polystyrene sheet and a manufacturing method thereof. The brown
polystyrene sheet comprises the following components in percentage by weight: 85-90 percent of general-purpose
polystyrene, 5-10 percent of high-
impact polystyrene and 5-10 percent of brown master batch. The manufacturing method comprises the following steps: mixing the raw materials in proportion; melting and extruding the mixture by using an extruder at the temperature of 180 to 250 DEG C; feeding the melt material to a die head and
casting into a thick sheet at the temperature of 200 to 250 DEG C; longitudinally and horizontally drawing and shaping the thick sheet in sequence to obtain a
thin sheet; treating the
thin sheet by processes of edge trimming, thickness measurement, spraying of
silicon oil on double surfaces, rolling up,
ageing treatment and splitting. The sheet is good in rigidity and
toughness; by uniformly mixing the brown master batch and reasonably controlling the preheating temperature, the sheet is uniform in color, good in light
transmittance and more attractive in appearance; in addition, the sheet is easy to stack up after being coated with the
silicon oil; therefore, the sheet can be widely applied to product packaging of foods, medicines,
electronics, clothes, toys and the like.