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UPVC Steel Liner Reinforcement Line
Table of Contents
1. Definition
A UPVC steel liner reinforcement line (also called steel lining / steel liner machine) cold-forms thin galvanized C, U, or lip-channel reinforcements that insert into the hollow chambers of PVC / UPVC window and door extrusions. The steel insert stiffens the plastic frame against wind load and thermal movement.
ZTRFM pack evidence for this encyclopedia entry is thin: a profile / section drawing is on file, but a complete host quotation that locks public speed, thickness, station count, or power is not. This page is therefore a definition and inquiry guide — not a numeric rating sheet.
2. Applications
- Reinforcement liners for PVC / UPVC casement and sliding window frames
- Door and French-door hollow-chamber inserts sized to the extrusion cavity
- Custom C / U / lip geometries matching a named UPVC system drawing
Industry reinforcement guides note that missing steel liners often cause frame bowing during install — the liner is a structural insert, not decorative trim.
3. Industry process context
Market steel-liner lines commonly follow:
- Manual or powered decoiler
- Guided infeed / light leveling
- Multi-stand roll forming of the C / U / lip section
- Hydraulic or servo cut-to-length
- Exit / collect table
Treat the station list above as industry context only. Do not publish a ZTRFM stand count or kW from vendor ads.
4. Parameter status
| Item | Internal pack status | Industry context (not ZTRFM rating) |
|---|---|---|
| Forming speed | Blocked — not provided | Market ads often cite roughly 8–30 m/min classes |
| Strip thickness | Blocked — not unified | Examples include about 1.0–2.0 mm GI; some window guides recommend about 1.2–1.5 mm for standard sizes |
| Main / hydraulic power | Blocked | Vendor examples vary (e.g. about 5.5–11 kW main classes) |
| Stations / shaft | Blocked | Ads may show about 11–14 stands; shaft examples about φ50–60 mm |
| Evidence on file | UPVC steel-liner profile drawing | Use the drawing to size tooling — not catalog averages |
Conflict call-out: public reinforcement-machine catalogs disagree on thickness and speed. Do not merge those ads into one “standard” encyclopedia table.
5. Boundaries
- Not a drywall stud / track main line
- Not an equal-leg perforated angle-bead (corner bead) line
- Not a shelf box-panel or rack upright mill
- Do not invent a single public thickness “typical of steel liners”
- Do not copy neighboring custom-misc machine ratings into this entry
6. Buyer FAQ
Why are speed and kW blank?
Source FAQ marks speed, thickness, and host power as blocked (profile drawing only; no complete machine quotation). Inventing a band would mislead buyers.
What should an inquiry include?
Finished liner cross-section (or UPVC cavity drawing), target thickness/grade, cut lengths, and expected output class. Engineering sizes the line from that evidence.
Is GI 1.2 mm “standard”?
Industry window articles often recommend about 1.2–1.5 mm for ordinary openings — that is market guidance, not a locked ZTRFM rating on this page.
Same as angle bead?
No. Angle bead is a plaster/drywall corner reinforcement with punching. Steel liner is an insert for UPVC extrusions.
Final ratings follow the confirmed technical proposal. Price and lead time are out of scope. Evidence status: HOLD until a complete host quotation is attached.
References
- STEEL-LINER thematic FAQ (evidence: UPVC steel-liner profile drawing; machine ratings blocked)
- Industry context: GI reinforcement profiles for UPVC windows — process context
- Related: equal-leg angle bead entry (different product family)