How to make an excellent plastic bucket mould? Practical bucket product design is the main factor.
Plastic buckets are widely used in chemical, food, pharmaceutical packaging, and other industries. Taking food packaging as an example, the design of plastic buckets needs to consider anti-theft, sealing, stacking effect, drop effect, etc.
The main points of bucket mould design are as under
1. Gate design
The gate position of the bucket mould is relatively fixed, mainly in the center of the bottom of the bucket. More recently, most buckets are hot runner injection moulded for productivity and cost-effectiveness. There are two main types of hot runners to choose from. One is a hot runner or hot runner, needle valve. The other thing is the choice of hot runner brands, such as Husky, domestic hot runner, Yuduo, and Master.
2. Design of the cooling line
The design of the bucket mould cooling line should be determined according to the bucket size and wall thickness. If the cooling line hole is too small and the cooling is not timely, it is easy to cause the mould not to cool in time, resulting in thermal corona on the product’s surface and affecting the product’s appearance.
Therefore, adopting a multi-circuit cooling design is necessary, which can not only cool the mould quickly but also cool it uniformly.
3. Mould structure design
The structure of the bucket mould is mainly based on the product’s design. The most common buckets on the market are round buckets. To save the cost of the mould, some mould manufacturers will make a round mould structure, which can save the cost of mould steel and mould processing, but will reduce the quality and life of the mould. However, square moulds ensure that the moulds are strong enough for the expected mould life.
4. Selection of mould steel
When choosing a bucket mould steel, consider the steel’s hardness, toughness, and processing cost.
These steel grades are usually P20, 718H, 718, 2344, H13, and Becu. They need to be tested by a spectrometer to ensure that it is the correct steel grade we ordered before machining. The choice of these steel grades depends on the customers’ cost, budget, and service life.
5. Processing equipment requirements
Bucket mould processing equipment mainly includes lathe, CNC, and EDM. Good equipment can process moulds more accurately according to the drawings, and the processed parts need to be CMM to see if they are within the tolerance range.
6. Bucket mould-making experience
The shape of the bucket looks similar. Most mould manufacturers can make bucket moulds, but not many can do it well. The main difference is the detailed experience.
Analysis of plastic bucket mould
A seemingly simple barrel mould has many factors to consider. The points that need to be paid attention to in the design of the barrel mould are:
The analysis of the uneven thickness of the bucket wall caused by the eccentricity of the bucket mould is as follows:
- If the cooling water flows unevenly in the core mould cavity area of the barrel mould, the molten plastic will flow unevenly. The hotter area has greater fluidity, and the cooler area has less fluidity, so the hot wall is a small piece. The buckets in the area are thicker. Different temperatures will generally result in a tolerance of at least 0.05mm.
- Under normal circumstances, the locking height of the barrel mould should be 20%-30% of the size of the plastic barrel. For example, the smaller barrel should be 20%, and the larger barrel mould should be about 30% of the height.
- We must pay special attention to the selection of processing equipment when we process the core cavity of the cylinder model.
Case study of bucket mould design
To obtain high quality paint bucket moulds, attention must be paid to the bucket mould design, the equipment of the moulding company, the experience of the technicians, and a good reputation.
Also, pay attention to the mould life of the paint bucket mould. To get a million shots and maintain a precise paint bucket mould, high-quality mould steel is a must in the project. The hardness of paint bucket mould steel must be at least HRC33 or higher. P20 can be used, or more expensive steel can be used. Currently, most paint bucket moulds are single-cavity moulds, which can use a 520-ton injection moulding machine.
For example, the eccentricity problem will cause uneven wall thickness of the paint bucket. Even if the core and cavity are machined with a high-speed CNC lathe during the machining process, eccentricity will occur during the assembly process. Eliminate the problem of center offset in processing and assembly first, and avoid delays in delivery due to frequent trial repairs in the future.
For the air-tightness of paint buckets, use high-precision equipment to ensure the design requirements in size, and conduct sealing tests and drop tests on the finished paint bucket to make ensure that it will shake violently and fall from a height when it is full of paint. It ensures that the paint doesn’t spill or smell.
In addition, pay more attention to the design of the paint bucket mould.
The design of the plastic paint bucket is essential. The quality of plastic paint buckets directly affects the competitiveness of products in the market. At the same time, the wrong design will also cause problems such as eccentricity and poor sealing of the paint bucket mould.
When the design problem of plastic paint buckets is solved, excellent bucket mould design ability is also critical.
Plastic paint bucket moulds are the basis for making high-quality plastic paint buckets. Learn more about the design of plastic paint bucket moulds, which can help you create high-quality plastic paint buckets with more substantial market competitiveness.
YuanCheng’s bucket mould design and manufacturing services
YuanCheng Mold is one of the leading plastic bucket mould manufacturers in China. We specialize in producing plastic paint bucket moulds, water bucket moulds, baby bucket moulds, food bucket moulds, mop buckets, and other types of plastic bucket moulds.
We are also very capable of customizing bucket mould design for other capacities.
Our factory offers a variety of bucket mould design, and the available forms include square, rectangular, elliptical, oval, and round plastic bucket moulds.