Injection Moulding Machine for Thread and Texturising Spools
Thread, sewing and texturising spools are moulded on horizontal injection moulding machines, usually in multi-cavity tools, from PS, PP, ABS or PC. Flange diameter sets projected area, and cavity count sets shot weight. Gating at the hub lets the melt reach both flanges evenly, which keeps them flat and the spool running true.
With spools, machine selection weighs flange area across the cavities, shot consistency between cavities and fine holding pressure control for the hub bore. Pratishna Engineers supplies horizontal injection moulding machines for spool production and can recommend a configuration for your spool and output.
Moulding Thread Spools?
Share the spool size, material, one-piece or two-piece design and quantity, and Pratishna Engineers will suggest a machine.
Machine Requirements for Spool Moulding
A spool has to sit true on the spindle and let thread unwind cleanly, which puts these needs on the process:
- Hub bore held to fit the spindle or holder
- Flat flanges that run concentric with the hub
- Smooth inner flange faces so thread does not catch
- Matched shrinkage between halves of snap-together spools
- Polished tool and clean material for clear spools
- Print or label panel moulded flat on the flange
Recommended Machine for Spools
Small sewing thread spools run in high-cavity moulds, and most of these sit comfortably on the E Series (75-180 T). Large texturising spools and wide-flange designs raise projected area, so those tools move to the C Series (140-320 T) or the H Series (120-350 T) according to flange size and cavity count.
Not Sure Which Machine You Need?
Send a spool sample or drawing with your cavity plan for a suitable machine size.
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
Questions thread makers and spool moulders raise when choosing tools and machines.
Which Injection Moulding Machine Is Used to Make Spools?
Sewing thread spools in many-cavity tools usually suit the E Series. Texturising spools and wide flanges need more clamping force for their projected area, so the C or H Series fits them better.Should a Spool Be One Piece or Snap-Together?
One-piece spools need split cavity slides to release the gap between the flanges, which makes the mould larger. Two-piece spools mould in plain open-and-shut tools, but the halves must shrink alike, so they share material lot and settings.How Is a Clear Spool Kept Free of Haze and Marks?
A polished cavity, clean hopper and no mixed regrind keep clear PS bright. PC spools also need drying, or moisture leaves silver streaks. Ejector pins sit on the hub, away from the visible flange face.
Why Do Spool Flanges Warp?
Thin flanges warp when one side cools faster than the other or when filling is uneven from an off-centre gate. Balanced cooling on both mould halves and a hub gate keep the flanges square to the bore.Can Pratishna Recommend a Machine for My Spool?
Yes. Share the spool drawing 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 Thread and Yarn Parts Too?
Yes. Similar machines produce sewing machine bobbins, spinning bobbins, textile cones and fabric roll end caps, 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.
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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