Quote:
Originally Posted by mdelannoy  I work for an acrylic processor which also does ship windows.
... Crazing seems to occur at the areas that have been bend in the shipyard. The shipyard might not have used enough oven time. Therefore crazing has occured.
I figure that you can anneal (find annealing temperature here)
by putting the whole sheet in the oven. This might remove some if not all crazing... |
I couldn't get your link to annealing temperatures to work.
Fabrication techniques such as thermoforming, cementing, machining, line bending, buffing, flame polishing, and screen printing can cause stress on parts made using acrylic sheet. Annealing, the strengthening of acrylic sheet through controlled heating and then cooling, minimizes the effects of fabrication stress.
Internal stresses in the sheet can cause crazing (the appearance of numerous tiny cracks in the material) when acrylic comes in contact with solvents such as glass cleaners or paints. Annealing helps to reduce crazing or large scale cracking by reducing internal stresses and increases the strength of cemented joints.
More: MINIMIZE IMPACT OF STRESS ON ACRYLIC SHEET THROUGH ANNEALING: Plastic Distributor & Fabricator
To anneal acrylic sheet, heat it to 180̊F (80̊C), just below the deflection temperature, and cool slowly. Heat one hour per millimeter of thickness – for thin sheet, at least two hours total.
More: Annealing Acrylic