Injection Molding Process for Construction Waste Chute Connectors

Connectors (buckles, clamp seats, feed-in door frames, etc.) are important accessories of the construction waste chute and are produced by injection molding. Longkang injection-molded parts are precise and durable, ensuring reliable connections. This article explains the injection molding process in detail.

1. Types of Injection-Molded Parts

Longkang construction waste chute injection-molded parts include:

1. Quick-release buckles (2 per joint)
2. Clamp seats (connect the pipe to the clamps)
3. Feed-in door frame (loading opening frame)
4. Inspection opening cover
5. Valve handle (optional)
6. Nameplate base
7. Features of the Injection Molding Process
8. Injection molding advantages

• Forms complex shapes
• High dimensional accuracy
• Smooth surface finish
• High production efficiency
• Suitable for mass production

2. Injection molding equipment

• Injection molding machine: 100–300 tons
• Injection volume: 500–1500 g
• Clamping force: 100–300 tons
• Computer-controlled, stable process

III. Buckle Production Process

1. Material

• PP (polypropylene) or reinforced nylon
• Reinforced nylon with 30% glass fiber
• High strength, good toughness
• Aging-resistant

2. Die

• Precision multi-cavity die
• Steel hardened by quenching
• Surface polished
• Service life ≥500,000 cycles

3. Process parameters

• Barrel temperature: 200–260 °C
• Injection pressure: 80–120 MPa
• Holding pressure: 40–60 MPa
• Cooling time: 20–40 seconds
• Cycle time: 30–50 seconds

1. Buckle Quality Requirements
2. Tensile resistance ≥5 kN
3. No fracture, no deformation
4. Close fit with the pipe body
5. Easy to install and remove
6. Reusable ≥20 times
7. Clamp Seat Production
8. Function

• Secures the pipe to the clamp
• Transfers the pipe weight to the fixing points
• One clamp seat per section

2. Material

• Reinforced PP
• Width 50 mm
• Matches the curvature of the pipe body

3. Process

• Injection molding
• Rubber pad on the inner side (anti-slip)
• Clamp mounting position on the outer side

1. Feed-in Door Frame
2. Structure

• Rectangular frame
• Matches the side opening of the pipe
• With door hinge and latch

2. Process

• Injection molded or welded
• Dimensions match the pipe opening
• Door sealing groove design

VII. Quality Control

1. First-article inspection of injection-molded parts for each batch
2. Sampling inspection of dimensions
3. Strength testing (buckle tensile test)
4. Visual inspection (no flash, no short shots)
5. Assembly trial fitting

VIII. Longkang Injection Molding Advantages

1. In-house dies, high precision
2. Premium materials, good strength
3. Mass production, low cost
4. Complete accessories, good interchangeability
5. Wear parts supplied separately