|
Type of Printer |
How it
works |
Advantages |
Disadvantages |
|
Laser |
A laser draws the image on
a master surface in the printer (the laser light neutralizes static charge). Plastic
powder (toner) sticks to charged areas of the master which have not been exposed by the
laser. The toner is transferred and fused to the paper by a hot roller.
|
- Excellent resolution
- Printer can be used for other tasks
- Good speed
- Economical for large-format labels (eg. 8.5" x 14")
|
- Synthetic labels usually do not give good results (the hot fuser can wrinkle or
melt plastics)
- Prints whole sheet of labels at a time; not ideal for small batches of labels
- Color laser printers are expensive
- Printers with convoluted paper path risk peeling off labels inside the printer
|
|
Inkjet |
Miniature electronic
"plungers" shoot tiny droplets of ink onto the paper. The ink is absorbed
into the surface of the paper or, in the case of special high-quality paper, into the
special surface coating.
|
- Can be low cost
- Good resolution
- Printer can be used for other tasks
- Color often available at reasonable cost
|
- Not as precise as laser or thermal for barcodes
- Moderately slow
- Inks usually run or bleed if exposed to water
- Prints whole sheet of labels at a time, not ideal for small batches of labels
- Requires some drying time
- Ink cartridges can be expensive
|
|
Dot
Matrix |
Miniature electronic
actuators bang the tips of fine (but tough) wires into an inked fabric ribbon which in
turn smashes into the surface of the paper, leaving behind a smudge of ink.
|
- Small/slow printers can be low cost
- Printer can be used for other tasks
- Using 1-across labels can print one label at a time
- Can be economical for very large labels (eg. 11" x 17")
- Can print multi-part carbon forms
|
- Low resolution; barcodes must be large to insure readability
- Printers generally slow and noisy
- Ink ribbons fade, often not replaced soon enough to avoid substandard barcodes
|
|
Direct Thermal |
The paper from which the
label is made is chemically treated and reacts to heat by turning black. The printer
has a row of individually controlled tiny electronic heaters (typically 200 to 300 per
inch); these turn on and off as the paper passes by, producing the desired image.
|
- Printers fast and quiet
- Simple to load labels (no ribbons or toner required)
- Printers can be small and economical
- Can deliver small batches of labels quickly and with no waste
- Barcodes are precise
|
- Chemically sensitive labels fade with age (6 months to 1 year); accelerated by
exposure to sunlight and heat
- Some chemicals can trigger darkening of labels (eg. highlighter or permanent
marker pen fumes)
- Surface of direct thermal stock is slightly abrasive; printheads wear a little
faster than if using thermal transfer method
- Printer dedicated to labels
|
|
Thermal
Transfer |
Uses thin plastic ribbon
with a thin coating of wax or resin impregnated with pigment. The labels (made of
plain paper or synthetic material) and the ribbon are pressed together as they pass a
thermal printhead (same type used for direct thermal). The heat transfers the
wax/resin from the ribbon to the surface of the label.
|
- Printers fast and quiet
- Printers can be small and economical for low-volume applications
- Can deliver small batches of labels quickly and with no waste
- Can print all types of label stock (paper and synthetic)
- Labels are durable, have good finish and long life expectancy
- Barcodes are precise
- Color ribbons available
|
- Printers for high-volume applications or large label sizes can be expensive
- In addition to labels, printer consumes one-pass ribbons
- Multi-color thermal transfer printers can be expensive
- Printer dedicated to labels
|