HP LaserJet 2200 Manuel de service télécharger pdf (Page 53)

C7058-90936 Media specifications 37

The paper storage environment should be properly maintained to ensure optimum printer

performance. The required condition is 20 degrees to 24 degrees C (68 degrees to 75 degrees F),

with a relative humidity of 45 percent to 55 percent. The following guidelines should be helpful when

evaluating the papers storage environment:

l Paper should be stored at or near room temperature.

l The air should not be too dry or too humid (because of the hygroscopic properties of paper).

l The best way to store an opened ream of paper is to rewrap it tightly in its moisture-proof

wrapping. If the printer environment is subject to extremes, unwrap only the amount of paper to

be used during the day's operation to prevent unwanted moisture changes.

Shipping print media

When shipping print media through different environments, plastic-wrap all cartons on the shipping

pallet. When shipping media across bodies of water, wrap individual cartons as well. Packaging must

protect the media from physical damage.

Paper fillers

Additional chemicals and fillers are frequently added to paper during the manufacturing process.

These can affect the paper strength, pick resistance, printability, bulk, feel, and color.

An emulsion containing wax, rosin, starch, or other non-water soluble materials is added to the paper

pulp to help control penetration by water and other liquids. Dyes are added and the paper might be

bleached. Bleaching is a multistep process using such chemicals as hydrogen peroxide and chlorine

dioxide. This transforms the paper from its original brownish state to the desired color.

Finely ground fillers, such as clay, talc, and calcium carbonate, might be added to even out the

“peaks and valleys” that occur in the paper mixture, and serve as brighteners. Over time, these fillers

can build up on internal assemblies of the printer such as rollers or the toner cartridge. This buildup

can eventually cause jams and print defects. To minimize this risk, periodically clean the printer

according to procedures. See "Cleaning the printer and accessories" in chapter 4.

Testing media specifications

The following tests describe ways to qualify the media with respect to the specifications listed in this

manual and the HP LaserJet Printer Family Print Media Guide. See “Tools and suppliers” on page 41

for help obtaining tools needed to perform these tests.

Basis-weight field test

The basis weight should be indicated on the ream label. If the label is not available, a simple field test

can identify the basis weight of paper. The basis weight of paper is equal to the weight of 2000

sheets of paper, or four full reams. Weigh a full ream on a postal scale and then multiply that weight

by four. Or, weigh 10 sheets of paper, divide that weight by 10, multiply by 2000, and then divide by

16.

Table 17. Determining basis weight of paper

Amount Formula

4 reams weight = basis weight

1 ream weight x 4 = basis weight

10 sheets (weight divided by 10) x 2000 and then divided by 16 = basis weight

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 323 324

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HP LaserJet 2200 Manuel de service Page 53