Overview
Polyurethane scraper bars are essential components in conveyor systems, designed to remove residual materials from belts to prevent wear and improve efficiency. Made from engineered polyurethane, they outperform rubber or metal alternatives due to their superior durability and gentle contact with conveyor surfaces. These bars are customizable in dimensions (thickness, width, length) and hardness to suit specific industrial needs. Their non-sparking properties make them ideal for explosive environments like coal handling.
Structure and Working Principle
A polyurethane scraper bar typically features a rectangular or tapered profile, mounted at an angle against the conveyor belt. The flexible PU edge conforms to belt irregularities while maintaining consistent contact pressure. During operation, the bar’s abrasion-resistant edge shears off adhered materials (e.g., coal, grain, or cement) without damaging the belt. Some designs include replaceable inserts or spring-loaded mechanisms for adjustable tension.
Key Features
Polyurethane scraper bars offer 3–5 times longer service life than rubber counterparts due to exceptional tear strength (up to 60 MPa) and elongation properties (500–700%). They resist oils, greases, and mild acids, making them suitable for harsh environments. Unlike metal scrapers, PU bars operate quietly and eliminate belt fraying. Their low coefficient of friction reduces energy consumption by minimizing belt drag.
Application Areas
Primary industries include mining (coal, iron ore), grain handling, recycling plants, and package sorting systems. In food processing, FDA-compliant PU grades prevent contamination. Secondary uses include windshield wiper blades in heavy machinery and cleaning rollers for printing presses. Specialty versions with conductive PU are used in explosive atmospheres.
Maintenance and Precautions
Inspect scraper bars monthly for edge wear; replace if thickness loss exceeds 20%. Rotate bars periodically to distribute wear evenly. Clean accumulated debris to maintain scraping efficiency. Avoid temperatures above 80°C (176°F), which may soften PU. Store unused bars horizontally in shaded, dry areas to prevent deformation or UV degradation.
B2B Procurement Guide
Specify required hardness (Shore scale), dimensions, and operating environment (temperature, chemicals). Bulk orders (10+ meters) often qualify for 5–15% discounts. Leading manufacturers provide CAD drawings for custom profiles. Request material certifications (e.g., ISO 9001, MSDS) for regulated industries. Sample testing under real conditions is recommended before large-scale procurement.
Related Manufacturers
- 主营：尼龙衬套、尼龙滑轮、螺丝螺母、尼龙制品、高分子塑料件
- 主营：橡胶管、吸砂管、高压胶管、软管橡胶、输水胶管、钢丝胶管、低压胶管、吸泥胶管、大口径胶管、钢丝骨架胶管、钢丝缠绕胶管、大 口径乳胶管、工业用吸排水胶、大口径吸水胶管、大口径排污胶管、大口径泥浆胶管、大口径法兰胶管、大口径橡胶胶管、大口径夹布胶管、大口径伸缩胶管、大口径真空胶管
- 主营：叉车轮、绳锯机、导线轮、聚氨酯、刮煤板、刮水板、档车块、定制板、减震板、耐磨板、耐磨条、传动轮、挡车板、后导轮、雨篦子、阻胎器、止滑块、清扫器、搅拌块、方向盘、定位器、细筛网、防滑块、耐油板、万向轮
- 主营：尼龙板、提升板、压链板、乙烯刮板、高耐磨、刮料板、pa66尼龙、尼龙衬板、塑料链片、乙烯链板、尼龙链片、增强阻燃、牛筋盘片、输送机链板、白色代扣管、管链机塞盘、管链机盘片、聚乙烯刮片、聚乙烯碟片、输送机链盘、输送机料盘
- 主营：赛钢板、玻纤板、环氧板、进口pom棒、peek板棒、亚克力板棒、尼龙板棒、pps板棒、pe板棒、pp板棒、pc板棒、ABS板棒、优力胶板、蓝色pom板、防静电pom板、环氧树脂板、有机玻璃板、电木板、PVC板