Calendering Equipment
Calendering Equipment
Multiple domestic factories for bidding. Free promotion. Price to be negotiated between winning bidder and buyer.
Please provide below information for posting:
- New or used; 2. Type of processing raw material; 3. Number of rolls; 4. Roll arrangement mode; 5. Roll face length or roll diameter; 6. Purchase quantity
表格
| Type | Working Principle | Core Advantages | Main Limitations | Typical Applications |
|---|---|---|---|---|
| Two‑Roll Calender | Material passes through gap between two counter‑rotating rolls for forming. | Simple structure, low cost, convenient operation and maintenance. | Low productivity, limited product accuracy; only produces simple sheets. | Laboratory tests, small‑batch production, rubber sheeting. |
| Three‑Roll Calender | Three rolls arranged in triangular or inline layout; material passes through two roll gaps sequentially. | Produces relatively thick sheets with moderate investment; meets general‑accuracy requirements. | Only single‑side rubber coating available; not suitable for ultra‑thin films. | Ordinary sheets, floor leather, single‑sided rubber‑coated fabrics. |
| Four‑Roll Calender | Four rolls arranged in inverted‑L, Z‑type or S‑type configuration. | Produces thinner products (minimum 60 μm); completes double‑side rubber coating in one pass; high accuracy and large output. | Complex structure, high cost, large footprint, demanding maintenance requirements. | PVC films, double‑sided rubber‑coated cord fabrics, artificial leather, waterproof coiled materials. |
| Five‑Roll & Multi‑Roll Calender | Five or more rolls for improved plasticizing and spreading performance. | Sufficient plasticizing and superior spreading effect; manufactures high‑quality rigid sheets. | Extremely complex structure, high cost, narrow application scope. | Rigid sheets, high‑precision special‑purpose products. |
Characteristics of Roll Arrangements
‑ Inverted‑L type: Most widely‑adopted four‑roll layout; uniform stress, high product accuracy and operator‑friendly. ‑ Z / S type: Reasonable roll stress, low deflection deformation; suitable for high‑precision film production. ‑ Differential‑diameter rolls: Rolls of unequal diameters to eliminate cumulative errors caused by roll‑diameter tolerance.
Core Technical Specifications
After confirming machine type, proper specifications shall be selected according to following key parameters:
Roll Diameter & Length (mm): Core dimensions defining calender size. Roll length determines maximum achievable product width; approx. 15 % of both ends are non‑working surfaces. Common standard sizes: φ360×1120, φ450×1200, φ550×1600, φ610×1730, φ710×1800. Large‑size modern calenders achieve roll face width up to 4‑5 m.
L/D Ratio (Length‑to‑Diameter): Ratio of roll working‑length to diameter; governs roll rigidity and thickness accuracy. Larger L/D leads to poorer rigidity and greater deflection deformation. ‑ Soft‑material processing: L/D = 2.5‑2.7, maximum ≤3 ‑ Rigid‑material processing: L/D = 2.0‑2.2
Roll Surface Speed & Speed‑Adjustment Range (m/min): Key indicators for productivity and technical grade. Stepless speed‑regulation ratio is normally around 10:1. Conventional speed: 50‑90 m/min; modern high‑speed units reach 200‑300 m/min.
Roll Speed Ratio: Linear‑speed ratio between adjacent rolls, affects shear plasticizing performance. ‑ Feeding rolls: 1:1.1‑1:1.5 for bubble elimination ‑ Friction‑coating operation: 1:1.2‑1:1.5 for rubber penetration into fabric ‑ Sheeting & laminating: 1:1 equal‑speed calendering
Product Thickness Range & Tolerance (mm): Processable thickness and dimensional deviation. ‑ Soft PVC film: 50‑1000 μm ‑ Hard PVC film: minimum 60 μm ‑ Thickness tolerance: ±0.015 mm along machine direction; ±0.05 mm across transverse direction.
Roll Separating Force (kN): Separation force exerted by material passing through roll gap; critical reference for roll and bearing design. Influenced by roll diameter, calendering width, product thickness and material viscosity.
Drive Power (kW): Power required for roll driving; rises nearly linearly with roll diameter.
Parison Wall‑Thickness Control Points: Determines wall‑thickness uniformity. Electro‑hydraulic servo system controls die‑gap; more control points deliver finer adjustment. Typical count: 24‑point, 48‑point, up to 128‑point.
Selection Guidelines
Follow clear logic for calendering‑equipment selection:
Define machine type according to finished‑product requirements ‑ Ordinary sheets and floor leather: three‑roll calender satisfies requirements. ‑ PVC films, double‑sided rubber‑coated cord fabrics and artificial leather: four‑roll calender as mainstream option. ‑ Rigid sheets and high‑precision special‑purpose articles: five‑roll or differential‑diameter‑roll calender is recommended.
Determine roll diameter & length by product width: Reserve adequate margin for target finished‑product width. Modern calenders trend toward large‑scale design with roll face width reaching 4‑5 m.
Select speed range based on output targets: Choose proper roll surface speed and speed‑adjustment range. Modern calenders pursue high‑speed operation up to 200‑300 m/min.
Configure precision‑compensation components according to quality requirements ‑ Strict thickness‑uniformity requirement: equip axis‑crossing device, roll pre‑loading device and roll‑bending compensation mechanism. ‑ Tight thickness‑tolerance requirement: install beta‑ray thickness gauge and closed‑loop automatic feedback control system.
Auxiliary‑line matching: A complete production line must include take‑off rolls, cooling units, thickness gauges and winding devices.
Participation Process
Manufacturers: Contact supplier service for supply registration.
Buyers: Click group‑purchase or contact procurement service to submit requirements. The platform filters suppliers from database or releases bidding based on aggregated demands. Buyers select competitive suppliers and sign sales contracts.
