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The 5-gallon smart cap (widely used as a sealing cap for water buckets of 3-gallon, 5L, 10L, etc.) is a simply structured but functionally specific sealing packaging component for barreled water. Its mold design focuses on "efficient demolding" and "sealing reliability", with the "central air-setting + ejection" demolding mechanism being the key to ensuring the cap is quickly and completely separated from the mold.
Structure: hot runner.
Cavity: 4 to 2 4Cavities.
Cavity: S136.
Hardness: 52-55HRC.
Core: M310 Hardness:48-52HRC
Slitter: DC53.52-55HRC
Central injector: Berylium copper: Different parts we use different material according to the running of the mold.
The plate of the mold: P20.
Hardness: 30-38degree.
Hot runner system: Hot runner made by our own factory. You also can choose YUDO, SINO, HUSKY or other famous brand hot runner system as your choice. We have cooperation with all the hot runner system supplier.
Cycle time: 10-15seconds on high speed machine.18-22Seconds run on the standard machine.
The guarantee time of the mold: 2Million shot times or one year.
5 Gallon Cover Also Known As 20L Drinking Water Bucket Cover
Usually used for water dispenser on the barrel water cover, the center of the cover one-time poke, convenient bucket cover into the water dispenser, inverted into a one-time poke water into the water dispenser. The focus of the design of the cover mold is to break once, and the mold should be processed by high precision machine tools and designed reasonably. The other part is the ratio of raw materials in the injection molding process. The machine should have enough clamping force to ensure that the center is convenient and clean to Pierce. We have a wealth of practical experience to provide customers with reference to learn.
Smart cap molds are usually multi-cavity (commonly 4 or 8 cavities, suitable for high-speed production), mainly composed of fixed mold, moving mold, cavity, core, central air-setting device, and ejection system:
1. Cavity and Core: The cavity corresponds to the outer surface of the smart cap (including edge buckles and top plane), while the core forms the inner surface of the cap (including central recess and sealing ribs). The two are precisely matched (with a gap ≤ 0.01mm) to ensure the dimensional tolerance of the molded cap is controlled within ±0.03mm (especially at the sealing part).
2. Central Air-Setting Device: Integrated in the center of the core, consisting of an air-setting pin, air valve, and air pipe. It is used to inject compressed air (air pressure 0.3-0.5MPa) into the inner surface of the cap before demolding. The gas pressure separates the inner surface of the cap from the core, forming a small gap to reduce demolding resistance.
3. Ejection System: Located on the moving mold side, composed of an ejector plate and evenly distributed ejector pins (usually 3-4, symmetrically arranged around the central air-setting device). After the central air-setting device is inflated, the ejector pins synchronously push up the edge of the cap, cooperating with air pressure to completely separate the cap from the core, ensuring no residue or deformation.
For buckets of different capacities such as 3-gallon, 5L, and 10L, the diameter (usually Φ50-Φ70mm) and height of the smart cap are slightly different. The mold achieves compatibility in the following ways:
1. Modular Core/Cavity: Replace core and cavity inserts of different specifications (quickly positioned by locating pins, replacement time ≤ 30 minutes) without replacing the entire mold;
2. Adjustable Ejection System: The length of ejector pins can be fine-tuned by gaskets (error ≤ 0.05mm) to adapt to caps of different heights;
3. Universal Central Air-Setting Device: The position of the air-setting pin can be adapted to the central recess of caps of different specifications through a fine-tuning mechanism to ensure stable inflation effect.
The core of the 5-gallon smart cap mold lies in the collaborative demolding mechanism of "central air-setting + ejection": reducing the adsorption force between the core and the cap through central inflation, and cooperating with evenly distributed ejector pins to achieve deformation-free demolding, while taking into account the precise forming of the sealing structure and multi-specification adaptability. This design not only ensures the sealing reliability of the cap (meeting the leak-proof requirements of barreled water) but also enables high-speed mass production (single-cavity cycle ≤ 10 seconds), making it an efficient and stable mold solution in the barreled water packaging field.
