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Spraying of Single Component Materials such as Acrylic Elastomers

Problem

Symptom

Cause

  • Low pressure, low temp >>>

Stream of material not a spray

Increase pump pressure increase temp setting

  • Material inlet starvation at pump >>>

Intermittent bursts from spray to stream pulsating spray pattern

Low on materials in container; plugged inlet screen; malfunctioning feed; prime pump/ air trapped

  • Spray pump continues to run with gun off >>>

Pump runs continuously; pulsating spray pattern

Rebuild fluid section of the pump

Spraying Plural Component Material such as Polyurethane Foam Insulation

Problem

Symptom

Cause

Incorrect Ratio

White spray and/ or soft foam

Lacking Isocyanate >>>

  • Restriction: if high pressure on isocyanate pressure gauge check between gun and console
  • Starvation : check from console to material supply system

Alternate white bursts and/or soft foam

Intermittent lack of Isocyanate >>>

  • Intermittent: check pumps on Isocyanate side

Dark spray and/or brittle foam

Lacking Polyol >>>

  • Restriction: if high pressure on Polyol pressure gauge, check between gun and console
  • Starvation: check from console to material supply system

Alternate dark bursts and/or brittle foam

Intermittent lack of Polyol >>>

  • Intermittent: check pumps on Polyol side

Incorrect Temperature

Stream of material not a spray

Low temperature >>>

  • Incorrect setting: increase as necessary
  • Electrical fault: troubleshoot electrically

Foam not fully expanded

Low temperature >>>

  • Incorrect setting: increase as necessary
  • Electrical Fault : troubleshoot electrically

Popcorn appearance on foam surface

High temperature >>>

  • Incorrect setting: reduce as necessary
  • Electric fault: troubleshoot electrically

Incorrect Mixing

Large droplets small spray pattern

Low Pressure >>>

  • Incorrect setting: increase air pressure to proportioning unit
  • Starvation: check from console to material supply system
  • Pump Fault: repair as necessary

Foam not fully expanded

Low Pressure >>>

  • Incorrect setting: increase air pressure to proportioning unit
  • Starvation: check from console to material supply system
  • Pump Fault: repair as necessary
    Frequently Asked Questions    >>>

    Copyright © 2000 ZUS Urethane Service, Inc. All rights reserved.

    Empire West / Urethane Service     

    12104 E Park Street

    Cerritos, CA 90703

    Tel.# 866-397-8677

    Fax # 562-404-0687

    steve.hille@empirewestcorp.com