Rockery fence rotational molding mold: How does the runner system improve product quality?

In the rotational molding process, the plastic raw material is softened by heating and injected into the mold, and then cooled and solidified in the mold to form a product of the desired shape. This process seems simple, but it actually involves complex physical and chemical changes. The runner system is the transmission channel for the plastic raw material in the mold, and its design is directly related to the distribution uniformity and filling efficiency of the raw material. A well-designed runner system can ensure that the plastic raw material is evenly distributed in the mold, avoid local shortages or accumulation, and thus minimize the generation of bubbles and defects.

Optimization design of runner system
Runner layout:
Runner layout is the core of runner system design. In the rockery fence rotational molding mold, the runner is usually designed as a tree-like structure, branching from the main gate to each small runner, ensuring that the raw material can be evenly and quickly filled into every corner of the mold.
In order to optimize the layout, the designer needs to fully consider the shape, size and fluidity of the mold. By accurately calculating the runner length, width and depth, and reasonably setting the branch points and intersection points, efficient transmission and uniform distribution of raw materials can be achieved.
Flow channel cross-sectional shape: The cross-sectional shape of the flow channel is also a key factor affecting the uniformity of raw material distribution. Common flow channel cross-sectional shapes include circular, elliptical, rectangular, etc. In the rockery fence rotational molding mold, the designer usually chooses a suitable cross-sectional shape according to the characteristics of the plastic raw material and the mold shape. For example, for raw materials with good fluidity, a smaller cross-sectional shape can be used to reduce the resistance of the raw material in the flow channel; while for raw materials with poor fluidity, a larger cross-sectional shape is required to ensure that the raw material can be smoothly filled into the mold. Flow channel temperature control: In addition to layout and cross-sectional shape, flow channel temperature control is also an important aspect of optimizing flow channel design. During the rotational molding process, the plastic raw material needs to be heated to above the softening point before it can be smoothly injected into the mold. However, too high a temperature will cause the raw material to decompose and produce bubbles and defects; while too low a temperature will make the raw material fluidity worse and affect the filling efficiency. Therefore, the designer needs to set a temperature sensor and a heating element inside the mold to monitor and control the flow channel temperature in real time. By accurately controlling the temperature, it can be ensured that the raw material maintains a suitable flow state in the flow channel, thereby achieving uniform distribution and efficient filling. Improvement of fence product quality by flow channel system
Reduce bubbles and defects:
The optimized flow channel system can ensure that the plastic raw materials are evenly distributed in the mold, avoiding local shortage or accumulation. This allows the raw materials to shrink more evenly during the cooling and solidification process, thereby reducing bubbles and defects.
Bubbles and defects are key factors affecting the aesthetics and service life of fence products. By optimizing the flow channel design, the probability of these defects can be significantly reduced and the overall quality of the product can be improved.
Improve surface finish:
Uniform distribution of raw materials not only helps to reduce bubbles and defects, but also improves the surface finish of fence products. During the rotational molding process, the raw materials flow fully in the mold and fit closely to the mold wall to form a smooth surface layer.
The optimized flow channel system ensures that the raw materials flow more smoothly and evenly in the mold, making the surface of the fence products smoother and flatter. This helps to improve the aesthetics and market competitiveness of the products.
Enhance structural strength:
Uniform distribution of raw materials also helps to enhance the structural strength of fence products. During the rotational molding process, the raw materials are fully integrated in the mold and form a dense internal structure.
By optimizing the flow channel design, it can ensure that the raw materials are distributed more evenly and tightly in the mold, thereby improving the impact resistance, compression resistance and aging resistance of the fence products. This allows the product to maintain stable performance and service life during long-term use.