Injection Moulding Machine for Sweet Boxes
Sweet boxes are moulded from crystal PS, PP or copolyester on horizontal injection moulding machines, typically in multi-cavity moulds. Machine size depends on the box footprint, which sets projected area, the cavity count and whether the lid is hinged or moulded separately. Gate position and mould polish matter most, because flow marks show on a clear box.
Machine choice for sweet boxes rests on fast, even filling of a thin clear wall and a clamp sized for the flat box and lid area. Pratishna Engineers supplies horizontal injection moulding machines for confectionery box moulding and can recommend a configuration for your box, lid and output.
Moulding Sweet Boxes?
Share your box and lid design, material and order volumes, and Pratishna Engineers will recommend a suitable injection moulding machine.
Machine Requirements for Sweet Box Moulding
A sweet box sells what is inside it, so surface clarity and a lid that closes cleanly count as much as cycle time. Check:
- Gate placed off the display face to hide vestige
- Polished cavities and steady fill to avoid flow marks
- Fast injection for thin crystal PS walls
- PP living hinge filled across in one direction
- Box and lid shrinkage matched so the lid snaps shut
- Even ejection that does not crack brittle PS corners
Recommended Machine for Sweet Boxes
Small sweet boxes in a few cavities can run on the E Series (75-180 T). Larger gift boxes, family moulds that make box and lid together and higher cavity counts raise the projected area, so the C Series (140-320 T) and the H Series (120-350 T) cover that work.
Not Sure Which Machine You Need?
Share your box and lid drawings, material and output for a machine match.
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
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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 KBFMCG Packaging Components & Machine Guide
A guide to FMCG Packaging components, covering caps and closures, preforms, thin-wall containers, IML tubs, cutlery, pumps and sprayers. It explains hot runner tools, cavity count, fast cycles, food-contact grades, and how to match each part to a suitable machine.
Download PDFPDF · 206 KB
FAQs / Buyer Questions
Common questions from confectionery packaging makers planning a sweet box mould.
Which Injection Moulding Machine Is Used to Make Sweet Boxes?
A horizontal machine sized to the box footprint and cavity layout. Compact boxes often suit the E Series, and bigger gift boxes or box-and-lid family moulds generally need the clamping force of the C or H Series.Why Do Clear Sweet Boxes Show Flow Marks?
Flow marks on crystal PS come from the melt front slowing or hesitating, often near the gate or where wall thickness changes. Correct gate position, higher injection speed, a warm polished mould surface and steady melt temperature reduce them.Should the Lid Be Hinged or a Separate Part?
A PP box can carry a moulded living hinge, so box and lid come out as one part. Crystal PS is too brittle to hinge, so PS boxes use a separate lid with its own cavity or a family mould.
Why Does the Lid Not Close Properly on Some Boxes?
Box and lid shrink differently because their shapes and wall sections differ. If the pair was not qualified together, the snap can be loose or too tight. Trial both from production moulds and adjust holding pressure and cooling until they close cleanly.Can Pratishna Recommend a Machine for My Sweet Box?
Yes. Share the box and lid drawings or samples, material, part weights, mould dimensions, number of cavities and seasonal output, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Food Packaging Parts Too?
Yes. The same kind of machine is used for ice cream containers, tub and container lids, thin-wall containers and IML tubs, provided the mould fits the platen and the clamp.
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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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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