Injection Moulding Machine for Sewing Machine Bobbins
Plastic sewing machine bobbins are made on horizontal injection moulding machines in high-cavity moulds, using clear PC or PS, ABS or POM. Cavity count sets clamping force, while the tiny part weight makes shot accuracy and screw size the main concerns. Flanges must stay flat and concentric, because a warped bobbin causes thread tension faults.
Bobbin machine selection centres on repeatable small shots, even filling across many cavities and short residence time for PC and POM. Pratishna Engineers supplies injection moulding machines, including the Hybrid PH with electric injection, for sewing bobbin production and can recommend a configuration.
Manufacturing Sewing Machine Bobbins?
Share the bobbin style, material, cavity plan and target quantity, and Pratishna Engineers will suggest a machine.
Machine Requirements for Sewing Machine Bobbin Moulding
Stitch quality depends on a small part being the same in every cavity, so the machine needs:
- Accurate dosing for a very small shot weight
- Screw size that keeps residence time short for PC and POM
- Flat, parallel flanges with a concentric bore
- Cavity-to-cavity consistency in high-cavity moulds
- Polished tool and dried material for clear bobbins
- Quick mould changes across a family of bobbin styles
Recommended Machine for Sewing Machine Bobbins
High-cavity bobbin moulds that need tight shot-to-shot repeatability can lead on the Hybrid PH Series (120-140 T), with electric injection. The E Series (75-180 T) suits smaller cavity counts and family tools. Very large multi-cavity moulds move to the H Series (120-350 T). For small tools, check that the screw is sized to the shot, not only the clamp.
Not Sure Which Machine You Need?
Send your bobbin sample and cavity plan, and get a machine and screw size suggestion.
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 KBTextile Components & Machine Guide
A guide to Textile components, covering cones, bobbins, dye tubes, spools, dye springs, creel parts, yarn guides and beam flanges. It explains heat-resistant grades for dyeing, concentricity, wear resistance, and how to match each part to a suitable machine.
Download PDFPDF · 211 KB
FAQs / Buyer Questions
Points sewing machine and accessory makers raise when setting up bobbin moulding.
Which Injection Moulding Machine Is Used to Make Sewing Machine Bobbins?
The choice follows cavity count. Large high-cavity tools can lead on the Hybrid PH Series, smaller tools fit the E Series, and the largest multi-cavity moulds go to the H Series.Why Do Some Plastic Bobbins Cause Tension Faults?
A bobbin with a warped flange or off-centre bore wobbles in the case and varies thread tension. Centre gating, equal cooling on both flanges and balanced cavities keep each bobbin flat and true.Which Material Suits Sewing Machine Bobbins?
Clear PC or PS lets the user see how much thread is left. POM gives wear resistance and low friction in the bobbin case. PC and POM both need short residence time, and PC must be dried.
Is One Mould Enough for Different Bobbin Styles?
Usually not. Each sewing machine type takes its own bobbin size and flange shape, so makers run a family of tools. Quick mould change and stored settings per tool save time between styles.Can Pratishna Recommend a Machine for My Sewing Machine Bobbin?
Yes. Share the bobbin style or sample, material, part weight, number of cavities, mould dimensions and monthly quantity, and Pratishna Engineers will suggest a suitable machine.Does the Machine Suit Other Small Textile Parts Too?
Yes. It can also mould thread spools, yarn guides, tensioner discs and cone holders, depending on 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.
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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