FAQ’s
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All your questions about the oil industry answered.
Why does my UWP die plate wear faster after changing from virgin polymer to recycled material?
Recycled polymers can contain higher levels of contamination, fillers, glass fibers, mineral additives, carbon black, pigments and other abrasive particles. These can significantly increase die-hole and die-face wear. The correct die material, carbide specification and knife material should therefore be selected based on the actual polymer formulation rather than simply the machine model.
Why are my pelletizer knives wearing faster even though the die plate is still in good condition?
Knife life depends on more than die condition. Knife material, hardness, bevel geometry, blade-to-die contact, cutter alignment, holder condition, cutting pressure and polymer abrasiveness can all affect wear. A change in formulation or throughput can also substantially change knife life.
Why does a die plate develop cracks after refurbishment?
A refurbished die plate can develop cracks if there are pre-existing fatigue cracks, excessive grinding, residual stresses, improper thermal cycles, damaged base material, or inappropriate brazing parameters. Refurbishment should begin with a detailed inspection rather than simply restoring the die-hole dimensions.
Can a die plate be refurbished multiple times?
Potentially, yes—but not indefinitely. Each refurbishment must be evaluated against the original geometry, remaining material, carbide condition, thermal characteristics and structural integrity. The objective should be to restore the die plate without compromising its mechanical or thermal performance.
Should I replace the knives whenever I replace the die plate?
Not necessarily, but the knives should always be inspected. If the existing knives have significant wear, damage or an unsuitable cutting geometry, installing them on a new die plate may compromise cutting performance and the new die-face life.
Should I replace the knives whenever I replace the die plate?
Not necessarily, but the knives should always be inspected. If the existing knives have significant wear, damage or an unsuitable cutting geometry, installing them on a new die plate may compromise cutting performance and the new die-face life.
How does die-plate heating affect pellet quality?
Uniform die-plate heating is important because temperature variation can affect polymer viscosity, flow through individual holes and pellet formation. Uneven heating can contribute to inconsistent pellet size or shape.
How do I select the correct die-plate material for abrasive polymer compounds?
The selection should consider polymer chemistry, filler type and percentage, production rate, operating temperature, pressure, required die life and maintenance strategy. For highly abrasive compounds, wear-resistant carbide protection may be appropriate. Custom die-plate designs can incorporate wear-resistant materials and carbide sections for demanding applications.
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