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Ultimate Guide to Polyurethane Screen Panel Aperture Design: Match Material & Screening Goals
Ultimate Guide to Polyurethane Screen Panel Aperture Design: Match Material & Screening Goals
The structural characteristics of different pore shapes (such as open porosity, anti-blocking properties, strength, and adaptability to material shapes) determine their applicable scenarios. The following is the specific selection logic and method:
1.Select according to material characteristics
|
Classification basis |
Material characteristics |
Recommended screen hole type |
Screen hole characteristics and applicable scenarios |
|
Particle shape
|
Spherical/nearly spherical (sand, grains, plastic pellets) |
Round holes, square holes |
- Round holes: Smooth hole walls, low resistance, less prone to clogging, high screening accuracy (good match between particle diameter and hole diameter) |
|
Particle size and distribution
|
Fine grain size (≤5 mm, such as coal powder, chemical powder) |
Hexagonal holes, small round holes |
- Hexagonal holes: High open area ratio (more holes in the same area), improving the screening efficiency of fine materials |
|
|
Medium to coarse grain size (5-50 mm, such as ore, gravel) |
Square holes, round holes, slotted holes |
- Small round holes (1-5 mm): Precisely control the screening accuracy of fine particles to prevent oversizing or undersizing |
|
Humidity and viscosity
|
Moisture / Stickiness (wet coal, clay, sludge)
|
Conical holes, slotted holes
|
- Conical holes: “small at the top and large at the bottom” funnel shape, preventing sticky particles from accumulating and clogging (e.g., when screening wet coal slurry in a coal washing plant, self-cleaning ability is superior to straight holes) - Slotted holes: long slits, often inclined in the direction of material flow, reducing the retention of sticky materials (e.g., screening clay brick raw materials)
|
2.Match hole type according to screening target
|
Core goals |
Recommended hole type |
Technical principles and typical cases |
|
Grading accuracy first |
Square hole/small round hole |
Square hole: Screened material ≤ hole side length (electronic quartz sand ≤ 0.5mm) |
|
(quartz sand, pharmaceutical excipients) |
Hexagonal hole/slit hole |
Small round hole: Accurately intercept oversized spherical particles (food-grade sugar) |
|
High production demand |
Conical hole/slit hole |
Hexagonal hole: Honeycomb structure opening rate ↑20% (iron ore powder production increased by 15%) |
3.Quick reference table of 5 major industry application scenarios
|
Application Scenario |
Material characteristics |
Core Requirements |
Recommended hole type |
Efficiency results |
|
Sand screening for construction |
Spherical sand, 5-20mm |
Uniform particle size + anti-blocking |
Round hole |
Concrete grading compliance rate ↑25% |
|
Wet coal screening for coal washing plants |
Wet sticky coal slime |
Anti-blocking + high yield |
Conical hole |
Blocking rate ↓60%, coal washing volume ↑18% |
|
Pulp fiber grading |
Fiber-like, uneven length |
Grading by length + anti-winding |
Slit hole |
Fiber integrity rate ↑90% |
|
Chemical powder screening |
Fine powder (≤1mm), high yield requirements |
High screening efficiency |
Hexagonal hole |
Processing volume ↑30% |
|
Potato chip sorting line |
Irregular flakes |
Remove debris and maintain shape |
Slit hole |
Authenticity rate ↑95% |
Advanced Engineering Skills:
Combined hole design: upper layer slit holes for impurity removal → lower layer hexagonal holes for fine classification (overall efficiency ↑40%)
Opening rate formula: Hexagonal hole opening rate = (π√3)/6 × (aperture/hole spacing)² (optimal value: 35%-45%)
Golden rule for anti-blocking: viscous material screen plate inclination ≥ 25° + conical hole design
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Annie Lu
Huatao Group
Mobile: 0086 18032422676 ( Whatsapp/Wechat/Viber)