Injection Moulding Machine for Spinning and TFO Bobbins
Bobbins for ring frames, roving, simplex and TFO machines come off horizontal injection moulding machines, moulded in PP copolymer, PP-GF or ABS. Bobbin length decides mould height and opening stroke, and cavity count sets shot weight and clamping force. Spinning bobbins run at high spindle speed, so concentric, uniform walls that keep the bobbin balanced are the main process target.
For bobbins, machine selection focuses on stroke for long slender cores, steady injection that fills the wall evenly from nose to base, and repeatable cycles. Pratishna Engineers supplies horizontal injection moulding machines for bobbin production and can recommend a configuration for your bobbin and frame.
Moulding Spinning Bobbins?
Share the frame model the bobbin runs on, the drawing or sample and volume, and Pratishna Engineers will suggest a machine.
Machine Requirements for Bobbin Moulding
Spinning mills reject a bobbin that wobbles, will not doff or collects fly, so moulding has to control:
- Even wall along a long, slender core
- Concentric bore so the bobbin runs balanced on the spindle
- Base and nose geometry that suits auto-doffing
- Antistatic grade or additive to stop fly building up
- Clean yarn surface without flash or gate marks
- Opening stroke for roving and simplex bobbin lengths
Recommended Machine for Bobbins
Ring frame and TFO bobbins are light enough for multi-cavity moulds on the E Series (75-180 T), within its stroke. Long roving and simplex bobbins, or more cavities, need more daylight and clamping force, so the C Series (140-320 T) and H Series (120-350 T) take those tools. Mould length usually decides the frame before tonnage does.
Not Sure Which Machine You Need?
Tell Pratishna Engineers the spinning frame and bobbin type to get a proposed 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
What spinning mills and bobbin makers ask first when planning a bobbin moulding line.
Which Injection Moulding Machine Is Used to Make Bobbins?
Horizontal machines sized by bobbin length and cavity count. Ring frame and TFO bobbins often fit the E Series, while long roving and simplex bobbins usually need the extra stroke of the C or H Series.Why Do Some Bobbins Vibrate on the Spindle?
An eccentric bore or a wall that is thicker on one side puts the bobbin out of balance. The cause is often a core that deflects during filling, so balanced gating at the nose and a supported core are checked first.Can Bobbins Be Moulded Antistatic?
An antistatic additive can be added to the PP, often through masterbatch, so the bobbin does not attract fly. Dosing has to stay constant, because too little gives no effect and too much can affect surface finish.
Does the Frame Model Change the Mould?
It does. Bobbins are made to suit a particular spinning frame, so length, bore, nose and base all follow that frame. A mill running several frame types usually needs a separate mould for each bobbin.Can Pratishna Recommend a Machine for My Bobbin?
Yes. Share the frame model, bobbin 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 Spinning and Winding Parts Too?
Yes. The same machines can mould textile cones, spools, cone holders and creel pegs, depending on the mould size and stroke.
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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