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Hydraulic Press

The dried impregnated cut paper is then stored in air-conditioned premises under controlled humidity. The required layers of dried-impregnated cut and stored Core Kraft Base, Barrier and Tissue Paper are stacked together known as booklet. Each such booklet is placed (sandwiched between both sides mirror/matt/textured finish Stainless steel plates (Moulds). A BOPP Film is placed as a separator between each set of two booklets to prevent sticking together of the formed sheet.

A number of such sandwiched booklets with moulds are then placed into the opening (daylight) of a 3600 ton hydraulic press (two views of hydraulic press shown below).

The booklets are pressed into a single sheet by keeping the same at 180 kg/cm² pressure at 150 °C for 45 minutes. Thereafter the sheet is allowed to cool down to room temperature by passing water through the daylight chamber for 20 minutes. The formed sheets upon cooling and attaining room temperature are removed. The BOPP separator sheet is removed for subsequent reuse (the sheet, after few operations is rendered useless and thrown away).