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In September 2019, after the old ethylene plant of Dushanzi Petrochemical was put into operation, the first phase of production was 3840UA, which is a new product of rolling plastics
.
Rotational molding, also known as rotational molding, rotational molding, rotational molding, rotary molding, etc.
, is Rotational Moulding in English, also known as rotomolding or rotocasting
.
The rotational molding process is to first add the plastic raw materials into the mold in the form of powder, and then continuously rotate the mold and heat the mold.
At this time, the plastic raw materials in the mold are gradually and uniformly melted and coated on the mold cavity under the action of gravity and thermal energy.
On the entire surface, the mold is then cooled, and the plastic product after demolding is a rotomoulded product
.
In terms of rotomolding raw materials, according to the research conducted by relevant industry organizations in recent years, it is known that among the rotomolding products in China, polyethylene and its composite material rotomolding in the market currently account for about 75% and 99% of the total rotomolding products.
The raw material of the above rotomolding products is PE, of which 95% is rotomolding grade LLDPE which is very suitable for rotomolding, while the proportion of foreign rotomolding polyethylene materials is roughly: LLDPE is 65%, XHDPE (cross-linked polyethylene ) is 2%, HDPE is 10%, and LDPE is 5%
.
Domestic raw materials currently include 7149U and 7151U produced by Qilu Petrochemical, YLR-3505 produced by Yangzi Petrochemical, and 3840UA produced by Dushanzi Petrochemical
.
As shown in the figure, the domestic rolling plastic price in 2018-2019 was significantly higher than the ordinary linear, and the price gap gradually widened.
In 2019, it was 50-850 yuan/ton higher than the ordinary linear
.
