How To Improve The Strength Of Rotational Molded Products?
If rotomolded products have such problems in terms of raw materials, molding processes and product structures, they will not only make the products easily deformed and damaged, greatly shortening the service life of the products, but may also cause greater harm to the user during use. Impairment results and harm. Therefore, whether the strength of the rotomolded products produced by molding is qualified is an important indicator for determining the quality of the products. The following measures should be considered when improving the strength of rotational molded products.
1. In terms of raw materials and additives, choose raw materials with better toughness and impact resistance. Raw materials with low density or low melt flow rate generally have better toughness than raw materials with high density or high melt flow rate; try to use special rotomolding materials; Increase the amount of raw materials; the raw materials should be kept dry and not expired; it should be clear whether the colorants or additives used are suitable for the rotational molding process and whether they can withstand the long-term high temperature of rotational molding without decomposing. Do not use them blindly. Add Just the right amount, not too much.
2.In terms of molding process, appropriately adjust the heating temperature and heating time, neither under-burning nor over-burning, to prevent decomposition and oxidation of raw materials or insufficient melting, which will lead to a significant decrease in the strength of the product; keep the vents open to balance the pressure inside and outside the mold. Avoid pinholes and pores in the product and improve the density of the rotomolded product; maintain an appropriate rotational speed ratio to make the wall thickness of the molded product uniform; appropriately increase the cooling intensity and cooling rate.
③In terms of rotomolding product design, rationally design the structure to avoid acute angles and planes where stress is concentrated, increase the arc transition angle of corners and grooves; increase the wall thickness of the product; add design reinforcement structures in areas where the product is subject to greater stress, etc. .
In short, as long as the structure of the rotomolded product is reasonable, the raw materials are used properly, the wall thickness is uniform, there are no bubbles, no oxidative degradation occurs, and the cooling method is appropriate, its strength will be at its best.