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I Purlin vs C/Z Purlin Machines
1. What people type, and what they hold
The query i purlin machine is noisy. Some buyers mean an I-beam used as a roof member. Some mean a Cee they saw drawn like a letter I on a sketch. Some mean a cold-formed I-section sold in a local catalogue. The mill you buy follows the PDF, not the letter.
C and Z purlins are the documented secondary members on the steel-building encyclopedia: web, two flanges, two lips, cold-formed from coil. That page already covers lapped Z, girts, and design standards. This page only unscrambles the “I” search.
2. Hot-rolled I is not a roll former
The cold-vs-hot forming wiki puts it in one line: a warehouse purlin is almost always a cold roll-formed product from coil; an I-beam for a heavy frame is typically a hot-rolled section from a shape mill. Temperature class and equipment class both change.
A hot I/H mill is a steelworks. It does not sit after a 5 t decoiler on a purlin line. If the inquiry is “I-beam mill” in that sense, this factory’s C/Z roll former is the wrong quotation. Automatic C80-300 (about 15 kW, 14 stations, φ80) is a Cee mill, not a hot-section mill, and a hot mill’s kg/m is not a Cee rating.
3. Cold-formed roof members that are in this catalogue
If the part is a Cee or Zed, use the existing branches. An I quotation is only written from an I drawing.
| Branch | Named reference (keep rows apart) |
|---|---|
| Dedicated C | Automatic C80-300 class: forming ~0–18 m/min, production with punch/shear ~0–12 m/min, main ~15 kW, ~14 stations, φ80, web ~80–300 mm, ~1.0–3.0 mm |
| Dedicated Z | Automatic Z80-300 class: forming ~0–18 m/min, production ~0–10 m/min, main ~18.5 kW on that Automatic class (another Z quotation lists ~15 kW), ~17 stations |
| C/Z auto-changeover (process library) | 20 stands, servo host 42 kW, high 32 / normal 12–18 m/min, hyd pre-punch 3 stations, cut+punch 15 kW, 1–3.2 mm, 380 V/50 Hz; dual-head decoiler 6 t/head on that sheet |
| CUZ | C, U and Z on one line; C/U web 80–300 mm, Z 120–300 mm; 1.0–3.0 mm; 3 ellipse punches 14.3×25.4 mm; 6 t hydraulic decoiler; 220 V/60 Hz |
| Fixed-size C | 45×75 / 45×100 only; 14 stands Φ80; 11 kW servo; hyd stop cut 5.5 kW; 0.7–2.0 mm; ~20 m/min; 440 V/60 Hz; 3 t manual decoiler |
A C mill and a Z mill are not the same line unless the quotation says interchangeable. That is already a full wiki. An “I purlin machine” RFQ that attaches a C drawing should be retagged as C, not as a fourth host type.
4. If the drawing really is a cold-formed I
Some markets sell a cold-formed I (two flanges and a web, no C lips, or a welded/locked web). There is no named process quotation in this batch named “I purlin mill” with locked kW. Quoting it as C80-300 with a different HMI name is a tooling lie.
Send: section, thickness, whether the web is one strip or two halves joined, hole map, cut method. Expect a custom flower. Sigma (folded web) is a different custom — see the sigma encyclopedia.
5. Which C/Z host to ask for
- Only C → dedicated C, or fixed-size if the two sections are 45×75 / 45×100
- Only Z → dedicated Z
- C and Z on one floor → C/Z interchangeable (and say the changeover tier)
- C, U and Z → CUZ named line, including its 220 V/60 Hz and ellipse punch
- Hot I/H primary frame → not this catalogue
6. Buyer FAQ
Is an I purlin just a C standing on the web?
Orientation on the roof does not change the roll path. If the section is a Cee, buy a C line.
Can the 42 kW CZ servo line roll a hot I-beam?
No. That 42 kW is the named auto-changeover host for 1–3.2 mm coil.
We have an I-shaped sketch with lips.
That is usually a C. Attach dimensions. An I mill is quoted from a dimensioned I section, not from a sketch letter.
Does CUZ cover I?
CUZ in this catalogue is C, U and Z. I is not in that list.
C/Z numbers in the table are labeled to Automatic-class wiki rows or named process quotations. No I-purlin kW is published. Commercial terms come back on the offer.
References
- ZTRFM wiki: Cold Forming vs Hot Forming (warehouse purlin vs hot I-beam)
- ZTRFM wiki: C and Z Purlins in Steel Buildings
- ZTRFM wiki: C Purlin vs Z Purlin Machine; C Purlin Roll Forming Line
- Process library: CZ auto-changeover; CUZ; Fixed-size C 45×75/100