Marine PVC Fabric Coating Technology — Calendering, Spreading, and Lamination
Technical comparison of PVC fabric coating methods used in inflatable boat manufacturing: calendering vs. spreading vs. lamination, and their effect on material properties.
Abstract
The performance of inflatable boat fabrics depends critically on the coating method used to bond PVC to the polyester reinforcement scrim. This research compares three primary coating technologies across adhesion strength, flexibility, weight, and cost metrics.
Coating Methods
Calendering
Pre-formed PVC film is heat-laminated to both sides of the polyester scrim simultaneously. Produces the most uniform coating thickness and smoothest surface finish. Used by Wavefella for all premium-grade fabrics.
Spreading (Knife-Coating)
Liquid PVC paste is spread onto the scrim and cured in heated ovens. Allows for thicker single-pass coatings but produces less uniform thickness. Common in economy-grade fabrics.
Coated Fabric Lamination
A pre-coated fabric is bonded to a second layer using adhesive or heat. Used for multi-layer constructions requiring specific surface properties on each side.
Results
| Property | Calendered | Spread | Laminated |
|---|---|---|---|
| Coating thickness uniformity | ±0.02 mm | ±0.08 mm | ±0.04 mm |
| Adhesion strength (peel, N/5cm) | 85 N | 65 N | 72 N |
| Cold flex (C°) | -25°C | -15°C | -20°C |
| Production cost index | 1.0x | 0.7x | 1.3x |
| Typical fabric weight (g/m²) | 850-1100 | 750-950 | 1000-1300 |
Conclusions
Calendered PVC fabric offers the best combination of coating uniformity (±0.02 mm), adhesion strength (85 N/5cm), and cold flexibility (-25°C), justifying its position as the premium choice for Wavefella commercial-grade inflatable boats. Spread-coated fabrics remain viable for economy products where cost reduction is prioritized over durability.