About Printing Cylinders
Seamless steel parent-shell tubes for later printing-cylinder machining. The drawing must define dimensions, material condition, allowance, geometry, surface condition, inspection and the required supply stage.
Use this page as a product and specification reference. The quotation must state the exact material grade, dimensions, manufacturer, certification or document scope, inspection, quantity, price, current availability, freight, and proposed delivery timing for the specific RFQ.
Specification reference
| Outer Diameter (OD) | 100mm to 400mm |
|---|---|
| Wall Thickness (WT) | 8mm to 25mm |
| Grades | Carbon Steel (St 35, St 52, SAE 1020) |
| Lengths | Typically cut to exact machine width dimensions |
| Finish | Turned or as-drawn seamless |
Confirm the exact grade, dimensions, tolerance, test certificate, and current availability for your requirement before ordering.
Common applications
These are enquiry contexts, not universal approvals. The project design and governing specification must approve the exact product, grade, dimensions, and service conditions.
- Flexible Packaging: Rotogravure cylinders for printing on plastics and foils.
- Paper & Publishing: High-speed magazine and newsprint rollers.
- Textile & Decorative: Embossing and wallpaper printing cylinders.
- Labels: Narrow-web flexographic printing bases.
Potential source references
The quotation must identify the proposed manufacturer, current availability, inspection documents, and delivery basis for the specific RFQ.
- Maharashtra Seamless Limited (MSL)
- ISMT Limited
- Imported European Mills
Printing-cylinder tube definition and supply stage
This product is the steel parent shell used before a finished printing cylinder enters engraving or press service. The tube provides material for outside turning, bore work, end-flange assembly, balancing, and subsequent surface preparation. The catalogue describes seamless carbon steel in turned or as-drawn condition.
DIN 2391 terminology and the EN 10305 series are precision-tube references used in the product description. The final drawing must set any geometric requirement for the shell, including the datum, measurement method, sampling plan, and acceptance value. Do not infer a universal concentricity or TIR limit from the product name.
The supplied tube is not a ready-to-engrave cylinder. End construction, dynamic balancing, fine turning, copper and chrome plating, and engraving remain later operations unless the quotation explicitly includes them. Keep parent-tube supply and finished-cylinder work as separate PO scopes so acceptance is clear.
Suitable buyers and unsuitable substitutions
Rotogravure cylinder makers, flexographic equipment shops, packaging-print suppliers, label converters, and maintenance teams buy these shells against machine drawings. The same tube family can also interest shops building rollers for paper, textile, decorative, or publication work when the engineering drawing permits it.
A standard structural pipe should not be substituted only because its OD appears close. Printing-cylinder work also depends on wall allowance, straightness, roundness, concentricity, surface defects, and the remaining section after machining. If a welded route is proposed, the cylinder designer must evaluate the weld zone, delivered condition, and machining plan rather than assume equivalence.
The buyer should also reject a vague ready-for-printing description. A parent shell and a plated, balanced, engraved cylinder represent different stages. State which party owns turning, flange fitting, balancing, plating, proofing, and final acceptance before the PO is released.
How Kanpur printing-cylinder shops specify a shell
Start with the press or cylinder drawing number. Add seamless manufacturing route, material grade, OD, wall, exact cut length, and required machining allowance. If the tube will be rough turned before flange work, state the target supplied condition and the dimensions that must remain after that operation.
Geometric requirements belong in measurable fields. Write straightness, ovality, concentricity or TIR, end squareness, and any bore requirement exactly as the approved drawing states. Avoid terms such as accurate or smooth without a value and inspection method. The receiving shop needs the same datum scheme as the supplier.
Define surface condition and permitted defects before transport. State whether the tube is as-drawn or turned, whether rust-preventive oil is allowed, and how surfaces and ends must be protected. Add dunnage, separator, sling, and stacking instructions when a scratch or dent would consume machining allowance.
Request the inspection-document type named by the project, heat traceability, dimensional report, and the agreed geometric inspection record. TPI can witness measurements when the end customer or PO requires it. IBR Form III-C is for boiler mountings and fittings, not an ordinary printing-cylinder shell purchase.
- Drawing: include press reference, finished-cylinder intent, and the supplier machining boundary.
- Material: state seamless route, grade, standard reference, and the required inspection-document type.
- Dimensions: give OD, wall, exact cut length, machining allowance, and end squareness.
- Geometry: define straightness, ovality, concentricity or TIR, datum, and report format.
- Delivery: request ex-warehouse Kanpur basis, applicable taxes, freight, dunnage, and receipt inspection.
Printing-cylinder shell comparison for Kanpur buyers
Compare offers at the same supply stage. A lower tube rate can hide missing turning, inspection, or protective packing, while a higher rate may include work that the buyer already planned in-house.
| Supply stage | OD range | Wall range | Included condition | Buyer must still define |
|---|---|---|---|---|
| As-drawn seamless shell | 100-400 mm | 8-25 mm | Parent tube in as-drawn finish | Allowance, turning plan, geometry, cutting, and protection |
| Turned seamless shell | 100-400 mm | 8-25 mm | Turned surface as quoted | Target dimensions, datum, TIR, bore work, and inspection report |
| Exact cut shell | 100-400 mm | 8-25 mm | Cut to machine-width requirement | Length tolerance, squareness, end protection, and piece marking |
| Finished printing cylinder | Drawing-specific | Drawing-specific | Outside the base-tube description | Flanges, balance, plating, engraving, and press acceptance |
The approved drawing and quotation control every supplied dimension, tolerance, operation, and inspection record.
Worked mass example for a parent shell
A buyer can normalize tube quotations by calculating theoretical steel mass. For a 100 mm OD seamless shell with 8 mm wall, calculate weight = (100 - 8) x 8 x 0.02466 = 18.15 kg/m.
A 6 m parent length has a theoretical base mass of 108.90 kg before cutting, turning, end components, plating, or permitted manufacturing variation. The cut plan should allocate finished shell lengths and remnants from that parent length rather than treating every offcut as usable stock.
The mass calculation is a commercial and material-planning check. It says nothing about concentricity, surface defects, internal soundness, or dynamic balance. Those requirements need drawing values and inspection records. Compare actual invoicing with the quotation basis and keep scrap ownership clear if cutting occurs before dispatch.
Machining handover and incoming inspection
In practice, the handover fails when supplier and machine shop use different datums. Put the measurement datum on the drawing and repeat it in the inspection plan. Match the tube marking and MTC before rough turning removes the original identification.
Measure OD, wall, length, straightness, ovality, and specified TIR at receipt. Inspect the outer surface and bore for dents, laps, scoring, rust, embedded dirt, and sling damage. Mark any affected area before deciding whether the machining allowance can remove it.
Protect the shell between operations. Use padded supports and clean separators, keep the bore covered, and prevent fork or chain contact with a surface reserved for turning or plating. Record condition after unloading if another contractor will machine the tube later.
Common PO mistakes include quoting only finished OD, omitting parent wall, failing to state supplied finish, and assuming balance is part of tube supply. Another failure is cutting all shells before the buyer approves a sample dimensional report. Hold the remaining material until the agreed first-piece check is complete.
For a Kanpur RFQ, attach both the parent-shell drawing and the downstream machining sketch. Mark finished OD, finished bore, face-to-face length, journal or flange interfaces, and the stock allowance left for each operation. Ask the bidder to declare which values describe supplied tube and which are targets after machining. That distinction prevents a nominal tube dimension from being mistaken for a finished-cylinder acceptance limit.
Before comparing quotations, create one line for each shell size and required supply stage. Record piece count, cut length, theoretical-mass basis, remnant ownership, identification method, inspection-document type, dimensional-report fields, packing contact surfaces, and delivery PIN code. Require deviations to be written against the same line. The resulting comparison is useful to a cylinder shop because it exposes omitted machining, inspection, or protection without inventing a standard lead time or local-stock promise.
Dispatch from Kanpur to printing and engineering clusters
Printing-cylinder shops in Panki, Dada Nagar, Fazalganj, Jajmau, Chakeri, and elsewhere should require the quotation to identify dimensions, grade, proposed source, condition, cutting, inspection, packing, current availability and delivery basis for that RFQ.
Compare the material ex-warehouse Kanpur and show applicable taxes separately from freight. Add the delivery PIN code, unloading method, maximum bundle length, and any requirement for covered transport. Regional service and timing must be confirmed in the offer rather than inferred from a site-wide claim.
A protected shell may need a different loading plan from commodity ERW pipe. Tell the sales desk when the surface or bore cannot contact ordinary steel dunnage. The accepted PO should state who checks transport condition and what photographs or reports must accompany the dispatch.
Key points for printing-cylinder procurement
- Buy the shell against the press drawing and a clearly defined supply stage.
- Separate parent-tube supply from turning, flange work, balancing, plating, and engraving.
- Specify OD, wall, cut length, machining allowance, geometry, datum, and surface condition.
- Inspect and record the tube before machining removes markings or surface evidence.
- Price material, cutting, inspection, packing, GST, and freight as distinct commercial lines.
What to include in the RFQ
- Specify the relevant standard or grade where known.
- Provide OD or NB, wall thickness or schedule, required length, and quantity.
- State the delivery city or PIN code and any unloading constraints.
- List MTC, IBR, TPI, marking, inspection, or other documentation requirements.