Injection Moulding Machine for Crate and Bin Lids
Crate and bin lids are made in single-cavity moulds on horizontal injection moulding machines, from PP copolymer or HDPE. A lid weighs little but has a large flat projected area, so it can need tonnage close to the body it fits. Lid and body must shrink alike to seal and stack.
With lids, machine selection centres on clamp force for the flat area, flatness after ejection and a shot that fills thin panels fully. Pratishna Engineers supplies horizontal injection moulding machines for lid moulding and can recommend a configuration to match your crate or bin range.
Manufacturing Crate and Bin Lids?
Share your lid drawing, matching body details and mould size, and Pratishna Engineers will recommend a machine.
Machine Requirements for Crate and Bin Lid Moulding
Lids are thin and flat but cover the whole crate or bin opening, and they have to match their body. Points to check:
- Clamp force sized to the full flat lid area
- Balanced cooling to keep a flat lid from warping
- Shrinkage matched to the body so lids seal and stack
- Thin panels filled fully without short shots at edges
- PP grade for moulded living hinges on hinged lids
- Even ejection that releases a large thin panel cleanly
Recommended Machine for Crate and Bin Lids
Smaller lids, or multi-cavity moulds for them, can run on the E Series (75-180 T). Lids for mid-size crates and bins usually need a C Series (140-320 T) or an H Series (120-350 T) machine, since the flat area drives tonnage more than weight does. Lids for full-size logistics crates sit at the top of these ranges and are checked on request.
Not Sure Which Machine You Need?
Send your lid and matching body details for a machine recommendation.
Why Choose Pratishna Engineers?
- Application-Based Machine Selection
- In-House Engineering & Manufacturing
- Multiple Machine Series
- Production-Focused Solutions
- End-to-End Technical Support
- Industry-Specific Solutions
- Machine Lifecycle Support
Injection Moulding Machine Buyer Resources
Download practical resources to help you select, size and specify the right machine.
Horizontal Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to select the right machine: product weight, projected area, number of cavities, plastic material, required clamping force, shot / injection capacity, mould dimensions, production quantity, cycle time and automation requirement.
Download PDFPDF · 265 KB
How to Calculate Clamping Force for an Injection Moulding Machine
A clear methodology that explains how clamping force is calculated, covering projected area, injection pressure, safety factor, number of cavities and material considerations.
Download PDFPDF · 363 KBMaterial Handling Components & Machine Guide
A guide to Material Handling components, covering crates, bins, milk crates, lids, label holders, castor wheels, pallet feet and dunnage trays. It explains HDPE and PP, large projected areas, stacking strength, recycled material, and how to match each part to a suitable machine.
Download PDFPDF · 203 KB
FAQs / Buyer Questions
Common questions from buyers moulding lids for crates and bins.
Which Injection Moulding Machine Is Used to Make Crate and Bin Lids?
Lid size and flat area decide it. The E Series covers smaller lids, while mid-size and larger lids move to the C or H Series. The lid machine is often close in tonnage to the body machine.Why Does a Lid Need Nearly as Much Clamping Force as the Crate?
Clamping force follows projected area, not part weight. A lid covers almost the same footprint as its crate, so the force needed to keep the mould closed can be similar although the lid is far lighter.Why Do Lids Not Fit Their Crates After Moulding?
Lid and body shrink by different amounts when material, wall thickness or mould temperature differs between the two tools. Qualifying lid and body as a pair, from the same material lot, catches this before production.
Can Hinged Lids Be Moulded in One Piece?
Yes, with a moulded living hinge in PP. HDPE lids use a separate hinge or pin instead. The hinge is usually flexed straight after ejection, while still warm, so it lasts in service.Can Pratishna Recommend a Machine for My Crate or Bin Lid?
Yes. Share the lid drawing, matching body details, material, part weight, mould dimensions and output, and Pratishna Engineers will recommend a machine.Does the Machine Suit Other Material Handling Parts Too?
Often, yes. Plastic bins, picking bins, component trays and foldable crate parts can run on the same machines where mould size and tonnage fit.
Technical Disclaimer
Disclaimer: The information provided in this webpage is for general informational and educational purposes only. It is based on technical references and industry information available at the time of preparation and may be subject to change. It does not constitute engineering, technical, commercial or professional advice, nor does it constitute a quotation, specification, warranty or contractual commitment by Pratishna Engineers.
Actual injection moulding machine and process requirements vary according to the component design, material, mould, production volume, machine configuration and operating conditions. The information, examples, calculations and recommendations provided should be independently evaluated and verified for the specific application before making any equipment, process or production decision. Information obtained from third-party sources remains subject to the accuracy and limitations of those sources.
Limitation of Liability: Pratishna Engineers makes no representation or warranty, express or implied, regarding the completeness, accuracy or suitability of the information for any particular application. To the extent permitted by applicable law, Pratishna Engineers shall not be liable for any loss, damage, cost or consequence arising from reliance on or use of the information contained in this webpage. Final machine selection, configuration and application suitability should be confirmed with Pratishna Engineers based on complete and accurate project requirements.
Talk to Our Engineers
Planning a New Injection Moulding Project?
Share your component, material, mould and production target. Our engineering team will help you identify the right machine configuration.
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