The invention discloses a high-antifogging
polystyrene sheet suitable for special
food packaging and a manufacturing method thereof. The high-antifogging
polystyrene sheet is prepared from the following raw materials in percentage by weight: 90-95% of general-grade
polystyrene, and 5-10% of resin K. The manufacturing method comprises the following steps: mixing the raw materials in proportion; carrying out
melt extrusion on the obtained mixture by an extruder; feeding a melt into a die head, so that the melt is cast into a thick sheet; sequentially carrying out longitudinal and transverse stretching and
sizing on the thick sheet, so that a
thin sheet is obtained; carrying out edge trimming, thickness measuring and aureoling on the
thin sheet; spraying an antifogging agent on one surface of the
thin sheet, wherein the content of the antifogging agent is 3-6% after being diluted by water, and the spraying amount is 3.0-4.3 ml / m<2>; and rolling, aging and slitting the thin sheet. According to the invention, in the process of sheet production, a reasonable amount of a diluted antifogging agent is sprayed on the surface of a sheet, so that the antifogging performance of the sheet is greatly improved, the antifogging grade can be as high as 5-grade, the sheet also can be completely transparent and has no formed
fog after packaging food, therefore, the sheet meets the packaging requirements of special foods, and has a broad market prospect.