The advantage of rotational moulding: 1)The cost of plastic rotational mould is low. 2)The edge of rotational moulding products can reach more than 5mm 3)variety of inserts can be placed to rotational mould. 4)The shape of rotational moulding products can be very complex 5)Rotational moulding products can be produced fully closed. 6)Rotational moulding products can be filled with foam material, to achieve thermal insulation. 7)No need to adjust the mould, the thickness of rotational moulding products can be adjusted. 8)It's available to deal with a variety of surface patterns and produce products in various colors.