B.3. Special Paper

Overhead Projection (OHP) Film

OHP film must be able to withstand the heat of fusing during the printing process. It should satisfy the conditions in Table B.3.

Table B.3 OHP Film Specifications

Item

Specification

 

 

Tolerance of heat

Must tolerate at least 190°C (374°F)

 

 

Thickness

0.100 to 0.110 mm (3.9 to 4.3 mils)

 

 

Dimensional accuracy

±0.7 mm (±0.0276 in)

 

 

Squareness of corners

90° ±0.2°

 

 

To avoid trouble, OHP film must be delivered face-up.

If OHP film jams frequently, pull the top of the sheet very gently as it leaves the printer.

Adhesive-Backed Labels

The basic rule for printing on adhesive labels is that the adhesive must never come into contact with any part of the printer. Adhesive paper sticking to the drum or rollers will damage the printer.

Label paper must be manually fed.

Label paper has a structure comprising three lay- ers, as shown in Figure B.1. The top sheet is printed on. The adhesive layer consists of pressure -sensitive adhesives. The carrier sheet (also calledthelinear orbackingsheet)holdsthelabels until use. Due to the complexity of its composi- tion, adhesive-backed label paper is particularly likely to give trouble in printing.

Adhesive label paper must be entirely covered by its top sheet, with no spaces between the individual labels. Labels with spaces in between are apt to peel off, causing serious jam problems.

Some label paper is manufactured with an extra margin of top sheet around the edge. Do not remove the extra top sheet from the carrier sheet until after printing is finished.

Top sheet (white bond paper)

Adhesive

Carrier sheet

Figure B.1 Adhesive-back label

Acceptable

Unacceptable

Top sheet

Carrier sheet

Table B.4 lists the specifications for adhesive

Figure B.2 Label arrangement

label paper.

 

 

 

 

 

 

 

 

 

 

Table B.4 Adhesive Label Specifications

 

 

 

 

 

 

 

 

 

 

 

 

Item

 

Specification

 

 

 

 

 

 

Weight of top sheet

44 to 74 g/m² (12 to 20 lbs/ream)

 

 

 

 

 

 

Composite weight

104 to 151 g/m² (28 to 40 lbs/ream)

 

 

 

 

 

 

Thickness of top sheet

0.086 to 0.107 mm (3.9 to 4.2 mils)

 

 

 

 

 

 

Composite thickness

0.115 to 0.145 mm (4.5 to 5.7 mils)

 

 

 

 

 

 

Moisture content

4% to 6% (composite)

 

 

 

 

 

 

 

B-5