First, Overmolding put the product into a mold made from a different set of molds using a regular injection molding machine to make a second injection molding. Two sets of molds are typically used to perform Overmolding. In a particular two-color/material injection molding machine, Double Shot Molding is the one-time injection molding of two different types of plastics. When two types of plastic are used in the same injection molding machine, only one mold product is created. Consequently, Double Shot Molding often involves a set of molds and calls for a unique Double Shot Molding equipment.
The plastic is in a molten state during the whole Dual Injection Molding process, preventing cooling and shrinking, giving the substrate and covering materials an opportunity to develop a strong chemical bond that will increase strength and decrease burr risk.
The Double Shot Molding cycle is shorter, more effective, and higher quality than the Overmolding since it does not require the insert procedure.
Dual Shot Molding, which involves injecting items with various plastics on the inner and outer layers, can be converted into one-step molding in place of secondary processing.
Due to the availability of many color combinations and the ability to use low-viscosity raw materials in the core material, Dual Shot Molding can breathe new life into outdated products.
Dual Shot Molding places greater demands on injection molding machines in terms of product correctness, beautiful appearance, better integration of diverse colors, and product molding cycle. Dual Shot Molding is not just a straightforward mixing of two or more colors of plastics.
The Dual Shot Molding injection machine may also be used to create items in monochrome, serving a variety of roles and offering comprehensive services. To cut the costs, the core material might be made from low-cost raw materials or recycled waste. To enhance the functionality of the product, high-quality leather with unique surface qualities or anti-electromagnetic interference can be utilized.
Dual Shot Molding processing and injection molding need numerous challenging steps, which are generally divided into two steps:
1. Stage Filling. When the mold is sealed and starts to fill in upto 95% in the cavity. The injection rate should be kept within a manageable range during this time. In general, molding efficiency increases with decreasing filling time.
2. Pressure Maintenance. While the holding stage is essentially the last step, the filling stage is the initial step to begin manufacturing. At this point, pressure should be applied continually to condense the melt and increase plastic density while preventing shrinkage. The best effect can be obtained by maintaining this stage until the plastic molding process is complete and the gate is solidified and sealed.
Dual Shot Mold machine is used to create the Dual Shot shell from two different materials.
Dual-shot molding allows for the use of different thermoplastic materials. The first shot is typically a rigid plastic, and the second shot can be a different color or a soft elastomer. Common material combinations include ABS/TPU, PC/TPU, and PA/TPU. The choice of materials depends on the specific requirements of the part being produced.
Yes, dual-shot molding is suitable for large-scale production. The process is highly automated, which means it can achieve high production volumes efficiently. Additionally, the ability to create complex parts in a single cycle reduces the need for multiple manufacturing steps and decreases overall production time.
When considering the use of dual-shot molding, factors such as part complexity, desired aesthetics, material compatibility, production volume, and cost should be considered. Consulting with an experienced injection molding manufacturer can help determine if dual-shot molding is the right choice for a specific project.