Injection Moulding Machine for Carry Case and Tool Case Bodies with Living Hinge
Small carry cases and tool case bodies with a moulded living hinge are made in PP copolymer on horizontal injection moulding machines, with body and lid moulded as one piece. Open body and lid area, case depth and mould height decide the machine. Gating matters most, because the melt must flow across the hinge so it survives repeated opening.
Because the case is moulded open, the clamp must cover the projected area of body and lid together and the stroke must clear the case depth. Pratishna Engineers supplies horizontal injection moulding machines for these cases and can suggest a size.
Moulding Carry or Tool Cases?
Share your case size, material and mould details, and Pratishna Engineers will recommend a suitable machine.
Machine Requirements for Carry Case and Tool Case Moulding
A one-piece case removes the hinge assembly but asks more of the mould and the press. Points to check before choosing a machine:
- Clamping force for body and lid area moulded open
- Opening stroke and mould height for deep case halves
- Gate placed so melt flows across the hinge line
- Hinge flexed straight after ejection while warm
- Balanced cooling to limit warpage on flat lid panels
- Moulded-in latch and stacking features with clean ejection
Recommended Machine for Carry Case and Tool Case Bodies
These cases are at the larger end of luggage mouldings. C Series (140-320 T) and H Series (120-350 T) machines suit mid-size tool and carry case moulds, while the E Series (75-180 T) covers the smallest vanity and accessory cases. Cases bigger than this are discussed on request.
Not Sure Which Machine You Need?
Share your case dimensions and mould size for a machine recommendation.
Why Choose Pratishna Engineers?
- Application-Based Machine Selection
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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 KBLuggage & Bags Components & Machine Guide
A guide to Luggage & Bags components, covering trolley parts, spinner wheels, buckles, zipper sliders, handle grips, lock housings and case latches. It explains POM, nylon and PP, two-material parts, wear resistance, and how to match each part to a suitable machine.
Download PDFPDF · 206 KB
FAQs / Buyer Questions
What case and tool box makers ask before they buy a press.
Which Injection Moulding Machine Is Used to Make Small Carry Cases?
Mid-size horizontal machines in the C or H Series, sized by the open area of body and lid and by case depth. Only the smallest cases fit the E Series, and bigger ones are discussed on request.How Does a Living Hinge Case Avoid Cracking at the Hinge?
The hinge needs a thin, even section, with the gate placed so the melt crosses it in one direction. Flexing the hinge a few times right after ejection orients the PP and gives it a long flex life.Can ABS or Glass-Filled PP Be Used for a Living Hinge Case?
PP copolymer is the material for a moulded living hinge. ABS and glass-filled PP give stiffer bodies but do not flex at a hinge, so cases in those grades use a separate hinge or pin.
Why Do Case Lids Warp?
Large flat lids cool unevenly when wall thickness varies or mould cooling is out of balance, and PP shrinks more than ABS. Even walls, ribbing and balanced cooling keep the lid flat so the latch closes.Can Pratishna Recommend a Machine for My Carry Case?
Yes. Share the case drawing or sample, material, part weight, mould dimensions including height, case depth and monthly volume, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Case and Luggage Parts Too?
Yes. The same machines can mould case latches and catches, trolley base brackets and grip housings, and corner protector tools, subject to the mould.
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.
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