Plastic Wheel Dustbin Mould

 

Mould name	Plastic Wheel Dustbin Mould
Dustbin material	HDPE, PP, plastic
Dustbin Size	740X585X997mm
Dustbin Volume	240L
Mould material for cavity &. Core	P20, 718
Mould base	P20
Injection system	Cold runner/Hot runner
Suitable injection machine	2400T
Mould size	1350X1080X1380mm
Mould lifetime	more than 500,000pcs

 

 

Both Polypropylene (PP) and High-Density Polyethylene (HDPE) are the top choices for manufacturing wheeled dustbins due to their durability, cost-effectiveness, and recyclability. Below is a detailed comparison explaining why these plastics dominate the market and which one suits different bin applications best.

1. Key Advantages of PP (Polypropylene)

Best for Lightweight & Cost-Effective Bins

Lighter than HDPE → Easier to tilt, roll, and transport.

Lower material cost → Ideal for budget-friendly bins.

Good flexibility → Less prone to cracking under stress.

Excellent Chemical Resistance

Resists acids, alkalis, and most cleaning agents → Suitable for kitchen & industrial waste bins.

Better for Hinges & Moving Parts

High fatigue resistance → Perfect for pedal-operated lids and wheel mechanisms.

2. Key Advantages of HDPE (High-Density Polyethylene)

Superior Strength & Impact Resistance

Rigid and tough → Withstands drops, impacts, and heavy loads.

Better for large-capacity bins (60L-120L+).

Excellent Weather & UV Resistance

Naturally UV-stable → Ideal for outdoor & industrial wheelie bins.

Performs well in extreme heat/cold (-40°C to 80°C).

Highly Recyclable & Eco-Friendly

#2 Plastic (HDPE) → One of the most recycled plastics.

Can be made from post-consumer recycled (PCR) content.

3. PP vs. HDPE: Direct Comparison

Property	PP	HDPE	Winner?
Impact Resistance	Good	Excellent	HDPE
UV Resistance	Moderate (needs additives)	High (naturally UV-stable)	HDPE
Chemical Resistance	Excellent	Excellent	Tie
Weight	Light	Moderate	PP (for lightweight needs)
Rigidity	Flexible	Very Rigid	HDPE (for heavy loads)
Cost	Lower	Higher	PP (budget option)
Recyclability	♻(#5)	♻(#2)	HDPE (more widely recycled)

 

 

 

1. Design

3D Modeling (CAD):

Use CAD software (SolidWorks, AutoCAD, or Creo) to design the mould based on the dustbin's dimensions, shape, and features (wheels, handles, lid mechanism).

2. Core & Cavity Machining

CNC Milling & EDM:

Use high-precision CNC machining for core and cavity.

EDM (Electrical Discharge Machining) for fine details (textures, logos).

Polishing to achieve a smooth surface finish (avoiding ejection issues).

3. Mould Testing & Optimization

Trial Run (T0, T1, T2):

Check for short shots, flash, sink marks, or warping.

Adjust injection speed, pressure, and cooling time.

Fine-tune ejection mechanism to prevent sticking.

4. Production & Maintenance

Regular Maintenance:

Clean and lubricate the mould after each run.

Check for wear on ejector pins and cooling channels.

Key Considerations for Wheel Dustbin Moulds:

A.Wheel Mounting Mechanism – Ensure smooth movement and durability.

B.Lid & Handle Integration – Must function without sticking.

C.Draft Angles – Critical for easy demolding (especially for deep bins).

D.Material Flow – Avoid weak spots near handles/wheels.

 

1. Mould Structure & Components The mould consists of two main halves: Core Side (Moving Half) – Attached to the injection machine's ejector system. Cavity Side (Fixed Half) – Mounted on the injection machine's stationary platen. Key Components: Sprue & Runner System – Channels that guide molten plastic into the cavity. Gates – Entry points where plastic flows into the mould. Cooling Channels – Circulate water to solidify the plastic quickly. Ejector Pins – Push the finished dustbin out after cooling. Sliders/Lifters (if needed) – For undercuts like wheel slots or handles. Vents – Allow trapped air to escape. 2. Step-by-Step Injection Moulding Process Step 1: Clamping The mould closes under high pressure (hydraulic or mechanical). Ensures no plastic leaks (flash) during injection. Step 2: Injection Plastic pellets (HDPE/PP) are melted in the barrel (at ~200–250°C). The screw pushes molten plastic into the mould cavity under high pressure (500–1500 bar). Step 3: Packing & Holding Additional pressure is applied to fill every detail (like ribs, logos, and wheel slots). Prevents sink marks and ensures dimensional accuracy. Step 4: Cooling Cooling channels circulate water to solidify the plastic (~20–60 sec, depending on thickness). Critical for warpage control (uneven cooling can deform the dustbin). Step 5: Ejection The mould opens, and ejector pins push the dustbin out. Air blasts or robotic arms may assist in part removal. Step 6: Mould Reset The mould closes, and the cycle repeats (typically 30–90 sec per cycle).

 

 

 

 

 

Mould Steel

 

Hot Runner System

 

Standard Parts

1. Regular Cleaning

After Each Production Run:

Remove plastic residue from cavities, runners, and ejector pins using brass or copper tools (avoid steel scrapers to prevent scratches).

Use specialized mould cleaners (e.g., silicone-based solvents) to dissolve stubborn plastic buildup.

Clean cooling channels to prevent blockages (flush with water or air).

Lubrication of Moving Parts

Ejector Pins & Guide Bushings – Apply high-temperature grease (e.g., molybdenum disulfide) to prevent sticking.

Sliders & Lifters (for wheel/handle mechanisms) – Lubricate with synthetic mould oil to ensure smooth movement.

Sprue Bushing & Runner System – Light oil to prevent friction wear.

Proper Storage When Not in Use

Apply rust inhibitor (e.g., VCI paper or anti-corrosion spray).

Store in a dry, temperature-controlled environment (humidity <60%).

Cover with protective film to prevent dust accumulation.

 

 

1. Customization & Precision

CAD/CAM-designed moulds for exact wheel alignment and structural integrity.

Options for 120L, 240L, 360L standard sizes or custom dimensions.

2. High Durability

Hardened steel (H13, S136) moulds for 500,000+ cycles.

Corrosion-resistant coatings for long-term use.

3. Fast Production Support

50–55 days lead time for new moulds.

24/7 technical support for troubleshooting.

4. Cost-Effective Solutions

Multi-cavity moulds reduce per-unit cost.

Material optimization to minimize waste.

 

>1. What's your lead time? For most mold,normally 50 to 55 working days ( not including Chinese official holidays ) after deposit received and mold drawings approved. >2. Do You Provide Mould Testing & Adjustments? Yes! Reputable manufacturers offer: T0 (First Trial) – Initial sample check. T1/T2 Adjustments – Fine-tuning for defects (sink marks, warping). Moldflow Analysis (Optional) – Simulates plastic flow before production. >3. How to approval samples? 1) You can come to our factory to see the mold testing directly. We could send samples by DHL, TNT, Fedex, and we can send mold running video and molding parts dimension inspection report to you by email. >4. How about your quality control? We have professional QC team to control mold quality from raw material,machining to the final mould testing parts,as we realize that quality control is the first priority to run business successfully, and the Quality is the life of enterprise. >5. Can You Make a Mould for Different Dustbin Sizes? Yes! Manufacturers can produce moulds for: Small bins (10–30L) – Household use. Medium bins (30–60L) – Office/commercial use. Large bins (60–120L+) – Industrial/wheelie bins.