REPAIR AND MAINTENANCE OF MOLDS By: Haris Numan TYPES OF MOLD - - PowerPoint PPT Presentation

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REPAIR AND MAINTENANCE OF MOLDS By: Haris Numan TYPES OF MOLD - - PowerPoint PPT Presentation

Jul 14, 2023 294 likes •491 views

REPAIR AND MAINTENANCE OF MOLDS By: Haris Numan TYPES OF MOLD DAMAGE & HOW TO IDENTIFY THEM. Pull Craze Stress Craze Front Impact Rear Impact Heat Craze Pull Craze Cause Difficulty releasing part from mold

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SLIDE 1

REPAIR AND MAINTENANCE OF MOLDS

By: Haris Numan

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SLIDE 2

TYPES OF MOLD DAMAGE & HOW TO IDENTIFY THEM.

  • Pull Craze
  • Stress Craze
  • Front Impact
  • Rear Impact
  • Heat Craze
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SLIDE 3

Pull Craze

  • Difficulty releasing part from mold
  • Patterns - commonly in bowl shape
  • Gelcoat has sheared away from laminate

Cause

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SLIDE 4

Pull Craze

  • Remove all gelcoat affected
  • Flair gelcoat at edges
  • Check laminate

Repair

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SLIDE 5

Pull Craze

  • Remove dust and wash down
  • Spray gelcoat
  • Post cure

Repair (continued)

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SLIDE 6

Pull Craze

  • Sand
  • Buff
  • Apply mold release

Repair (continued)

  • Spray and blow gelcoat
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SLIDE 7

Stress Craze

  • Bending laminate
  • General damage to laminate
  • De-laminating gelcoat

Cause

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SLIDE 8

Stress Craze

  • Remove damaged gelcoat and

laminate

  • Flair gelcoat at edges

Repair

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SLIDE 9

Stress Craze

  • Replace Laminate
  • Sand repaired laminate
  • Remove all dust and wash down

Repair (continued)

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SLIDE 10

Stress Craze

  • Spray

gelcoat

  • Post cure

Repair (continued)

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SLIDE 11

Stress Craze

  • Buff
  • Apply mold release
  • Spray and blow gelcoat

Repair (continued)

  • Sand
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SLIDE 12

Front Impact

  • Hard impact on gelcoat side of mold
  • Circular cracks radiating out from center
  • General laminate damage

Cause Repair

  • Same as stress craze
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SLIDE 13

Rear Impact

  • Hard impact on laminate side of

mold

  • Star-like cracks radiating from center
  • f impact
  • General laminate damage

Cause Repair

  • Same as stress craze
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SLIDE 14

Heat Craze

  • Heating beyond HDT of gelcoat
  • Gelcoat can de-laminate over time
  • Random straight cracks

Cause Repair

  • Same as pull craze
  • Thermoshock - repeated heating

and cooling

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SLIDE 15

Repair Procedure

  • Setup repair area
  • Pick lines that break

light

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SLIDE 16

Repair Procedure

  • Ensure repair area is clean and dust free
  • Spray well above original gel height
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SLIDE 17

Repair Procedure

  • Area must be shaped
  • Start with coarse sand paper 60 to

100 grit

  • Use large, hard sanding block
  • Switch to finer grit 220
  • Use hard block until finished
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SLIDE 18

Repair Procedure

  • Hard block
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SLIDE 19

Repair Procedure

  • Soft Block