Gate Bushing and Nozzle Maintenance for Injection Molders
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<p>Proper maintenance of gate bushings and nozzles extends mold life and improves part quality.</p>
<p><strong>Gate Bushing Maintenance:</strong></p>
<ul>
<li>Clean gate area after each production run using brass brush (never steel)</li>
<li>Check gate diameter monthly - wear of 0.05mm+ can cause flash</li>
<li>Polish gate surface when flow marks appear</li>
<li>Replace bushings when gate wear exceeds 0.1mm</li>
</ul><p><strong>Nozzle Care:</strong></p>
<ul>
<li>Inspect nozzle tip for damage before each mold setup</li>
<li>Clean nozzle tip with copper wire brush while hot</li>
<li>Check nozzle alignment with sprue bushing - misalignment causes drool</li>
<li>Apply anti-seize compound on nozzle threads (max 350C rated)</li>
</ul><p><strong>Common Problems:</strong></p>
<ul>
<li>Drooling: check nozzle tip temperature and back pressure</li>
<li>Stringing: adjust nozzle retract timing</li>
<li>Gate blush: reduce injection speed at gate switch point</li>
</ul><p>Scheduled maintenance every 500 hours keeps your hot runner reliable.</p>
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