Changes in temperature and humidity have a significant effect on paper. Because the amount of water vapor present in the air varies greatly depending on geography, season, climate, time of day and the weather, paper manufacturers and converters wrap their products in vapor barrier packaging to prevent moisture transfer between the paper and the air around it.
- Paper received from a truck or unconditioned warehouse should be allowed to acclimate in the environment where it will be used before it is unwrapped. Suggested guidelines:
- 24 hours for boxed product
- 72 hours for rolls
- Keep paper wrapped until it is ready to load into the printer.
- Store paper off the floor, preferably on a pallet or rack.
- Do not store paper near heating units or in front of ventilation units.
- If a wrapper is torn or if only part of a package is to be used, reseal the wrapper to prevent moisture penetration.
The environment around the printing equipment should provide stable temperature and relative humidity conditions. Optimal performance is achieved at between 40-60% relative humidity and between 65-75º F.
Moisture Related Issues
Paper fibers swell or shrink as they take or give moisture. The effects of moisture gain or loss from exposure to ambient air conditions may be:
- Tight or bowed edges caused by moisture loss.
- Wavy edges and moisture welts caused by moisture gain.
- Static and feeding problems caused by extremely low moisture content, or uneven moisture content from inadequate acclimation.
- Register and sync errors caused by dimensional instability due to uneven moisture content.
Loading and Handling Recommendations for Xerographic Papers
Before loading the paper, ask the following questions:
- Is the ream sealed?
- Has the ream been acclimated?
- Is the ream free of obvious defects?
Always load the ream according to the directional arrow on the package, even if both sides are eventually going to be imaged. Some Enterprise Group products have labels with arrows and/or printed directions.
How can you tell which way to load a particular copier to make sure the seam side is imaged first?
- Mark the side of the paper that is face up in the paper tray with an "X".
- Copy this sheet and determine which side received the image.
- Do not judge how to load paper by how the sheet exits the copier.
- Repeat this exercise for each of the paper trays in your copier. Some copiers have multiple feed trays with different paper paths.
- Once loading orientation is determined, put a label in the feed tray that indicates if the tray should be loaded seam-side up or seam-side down.
Important Roll Handling Tips
Safety warning: rolls are heavy - please handle with care!
- Inspect pallets for damage.
- Position pallet on a level surface.
- Allow enough space to move rolls without danger of getting pinned against a wall or other object.
- Slide chock to remove one roll at a time. Keep chocks in place for unused rolls.
- Do not drop any rolls off the end of the pallet. Use a ramp or roll cart to move rolls.
- Do not attempt to stop a roll from tipping. Stand clear of a falling roll.
- Do not move any pallet with unsecured rolls.