Product Overview
Our 5-Gallon (18L–20L) Bucket Injection Molds are engineered for high-volume production of industrial and food-grade pails, optimized for chemical, paint, lubricant, and food packaging lines.
Why Leading Packaging Manufacturers Choose Our Molds
Concentricity Within 0.05 mm: 4-side oversized mechanical taper-locks eliminate core deflection, ensuring uniform wall thickness for passing 3-meter drop tests.
Beryllium Copper (BeCu) Cooling: Premium BeCu inserts at deep-core bottom and gate areas expel heat 20% faster to sustain a stable 35–65s cycle time.
FEA-Optimized Stacking Ribs: Computer-simulated cavity geometry supports 5-layer pail stacking (up to 120 kg top load) without any sidewall bulging.
0.01 mm CNC Rim Machining: Ultra-precise top lip styling ensures a 100% airtight, leak-proof snap-fit with your standard or tamper-evident lids.
Main Parameters
| Mold information | Content |
| Product Material | ABS,PP,PC,PA,PMMA,PS,POM and etc. |
| Moldbase | FUTABA,LKM,HASCO,DME you can choose |
| Cavity material | 45#,50#,P20,H13, 718 2738, NAK80,S136, SKD61 etc |
| Gate type | Side gate,Sub gate,Pin point gate,Edge gate etc |
| Treatment | Heat treatment and Nitriding,polish ect. |
| HRC | H45~ -52 |
| Product weight | 50~ 5000 K |
| Machine type | 130ton-550ton |
| The standard of appearance of the products for stripe | MT(Mold Tech),YS,HN series |
| The way of Color contrast | RAL K7,PANTONE |
Custom Industrial Engineering Options
We support advanced packaging features to help you capture higher-margin markets:
In-Mold Labeling (IML): Seamless mold structure integration for automated robotic IML systems.
Tamper-Evident Logic: Precision CNC-machined lip areas for tear-strip or safety-lock bucket lids.
Versatile Handle Designs: Interchangeable inserts supporting both plastic handle ears and metal wire handle configurations.
Brand Customization: Replaceable logo blocks for easy OEM/ODM branding switches.
Quality Control and Pre-Shipment Trust Verification
To eliminate overseas procurement risks, every mold undergoes strict validation before export clearance:
3D Mold Flow Analysis: Simulates filling, venting, and deformation behavior to optimize gating placement before steel cutting.
CMM Dimensional Verification: 100% verification of critical tolerances, roundness, and lid-matching interfaces.
Pressure and Leakage Testing: Testing of all cooling circuits at high pressure to ensure zero water leakage inside your machine.
Continuous Industrial Trials: A minimum 4-hour continuous stress test run on our internal injection lines.
Documentation Provided Upon Shipment:
- Comprehensive CMM Inspection and Steel Mill Certificates
- Full 2D and 3D Editable Mold Design Drawings
- Optimal Machine Parameter Setup Checklist for your technicians
- High-Definition Trial Videos and 20+ Physical Sample Buckets for your local testing
Packaging, Logistics and Lead Time
Protective Packaging
Heavy anti-corrosion coating + vacuum plastic sealing + reinforced export wooden crate.
Spare Parts Package:
Complimentary wear-parts kit including O-rings, ejector pins, cooling connectors, and heating bands.
Lead Time
45-60 Days for standard bucket molds; 60-90 Days for highly customized IML or multi-cavity solutions.
The main parts
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Core HRC: 51- 53 Material:Steel 2344 from SCHMOLZ+BICKENBACH Highly glossy surface finish |
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Cavity HRC: 47-49 Material: Stainless Steel 2083 SCHMOLZ+BICKENBACH Highly glossy surface finish |
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Heater Heater striper from B.G.H Germany Stable working,energy saving, Easy changing in the machine |
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Nozzle HRC:80 Material: Tungsten steel |
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Pin HRC 60-63 Material SKD61 Long life time,stable working. |
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Mold Base Plate HRC: 32-34 Material: Stainless steel from FS. 4CR13 China |
Company information!
Our services & after-sale guarantee
Product lifetime maintenance
One-stop service
Precision Machining
Professional and meticulous service
Cheap price
Visualize the whole process of manufacturing and transportation
Certification
FAQ
Q: Can this mold produce food-grade 5 gallon buckets safely?
A: Yes. For food-contact applications, we utilize specialized S136 stainless steel for the cavity and core to prevent contamination, and design the system to run seamlessly with food-grade PP/HDPE virgin resins without the need for toxic lubricants.
Q: How do you ensure the bucket lid fits perfectly and doesn't leak?
A: We highly recommend ordering the bucket mold and lid mold together. We calibrate the shrinkages simultaneously and use high-precision CNC machining on the rim sealing lip. This guarantees a perfect airtight snap-fit or screw-fit, passing strict liquid drop and tilt tests.
Q: Large molds are prone to sticking during ejection. How do you solve this?
A: We utilize a dual-ejection system combining mechanical ejector plates/stripper rings with high-volume pneumatic (air assist) valves. Air is introduced at the bottom core during the opening cycle to break the vacuum, ensuring smooth, automated drop-offs without scratch marks.
Q: Can we use recycled plastic materials in this mold?
A: Yes. If you plan to use recycled materials (common for construction/chemical pails), please inform us during the quotation stage. We will adjust the hot runner nozzle diameters, venting channels, and steel hardness to handle the higher wear and different melt flow indexes of recycled resins.
Q: What is your policy for spare parts and international maintenance?
A: All wear-prone components are machined to standard global metrics (LKM, HASCO, or DME) with 100% interchangeable tolerances (within 0.005mm). You can easily source replacement parts locally, or request express shipping from our factory stock.
Q: What machine specifications do you need from us to start the project?
A: Please provide your injection molding machine tonnage, maximum opening stroke, tie-bar spacing, and plasticizing capacity. This ensures the mold size and weight match your machine perfectly, preventing setup delays.
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