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Printing Process & Techniques Year 3 > Printing Methods > Flashcards

Printing Methods Flashcards

1
Q

What is block printing?

A

-wooden block hand carved so the design is raised on the surface

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2
Q

What are 2 pros and 2 cons of block printing?

A

PRO:

  • simple method of print
  • no expensive equipment

CON:

  • involves lots of manual work
  • very slow and requires skill
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3
Q

What is copper plate / intaglio printing?

A
  • design is engraved onto copper
  • paste enters the recesses of the plate
  • plate is pressed to fabric so the paste transfers
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4
Q

what is engraved roller printing?

A
  • like the copper plate printing, but with a cylinder
  • paste is fed into the roller to fill recesses
  • steel blade removes paste continuously from the raised surfaces
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5
Q

What are the pros and cons of engraved roller printing? 2 of each

A

PROS:

  • fine sharp outlines
  • very good for long runs

CONS:

  • costly
  • not economical for short runs
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6
Q

What are 2 cons of engraved roller printing?

A
  • costly

- not economical for short runs

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7
Q

Flatbed screen printing accounts for X% of world printed textiles production

A

23%

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8
Q

What percent of world printed textiles are made with rotary screen printing?

A

61%

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9
Q

What is the screen printing process?

A
  • fabric attached
  • screen placed on fabric against registration stops to prevent movement
  • paste applied against edge of frame
  • paste forced through open areas of design by squeegee
  • screen lifted, moved to next part, etc.
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10
Q

What are 3 pros of screen printing?

A
  • quick pattern making
  • more colours can be printed
  • sharps lines produced easily
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11
Q

What are 3 cons of screenprinting?

A
  • large amount of tables required for high production
  • delicate shading difficult to obtain
  • screen clogging
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12
Q

What are 2 advantages of semi/automatic screen printing?

A
  • greater production than manual

- printing with different repeat easier

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13
Q

what are 2 cons of semi/automatic screen printing?

A
  • long set up time

- paste may not be evenly controlled

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14
Q

What fabric is used to creat a printing screen?

A
  • mainly stretched polyester

- sometimes silk

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15
Q

What is raster?

A

No. Of threads per inch

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16
Q

How is a design put onto a screen?

5

A
  • screen coated with photosensitive polymer
  • dried
  • exposed to light source (dark room conditions or UV)
  • exposed areas give insoluble polymer.
  • Unexposed is washed out, leaving spaces for the paste to pass through
17
Q

What is rotary screen printing?

A
  • cylindrical screens rotate in contact with the fabric
  • paste fed from inside screens
  • forced through with squeegee
18
Q

How many colours can a rotary screen printing machine work with?

A

-average 7, up to 26

19
Q

What is good about rotary screen being made from nickel foil?

A

-makes them very durable for prolonged use

20
Q

Name 4 adjustments that printing with CAD allows

A
  • editing
  • creating repeat patterns
  • changing colours
  • colour separation
21
Q

Name 3 textile printing trends within industry

A
  • growth of Asian production at the expense of western production
  • demand for shorter production times
  • demand for greater variety in design
22
Q

What are 3 pros of inkjet printing?

A
  • no screen required
  • photographic quality
  • no physical pressure on fabrics
23
Q

What is DPI?

A

Dots per inch

24
Q

What DPI is photographic quality?

A

720 DPI

25
Q

Name the 4 colours used for inkjet printing

A

Cyan
Magenta
Yellow
Black

26
Q

How does drop on demand inkjet printing work?

4

A
  • involves firing small jets (as droplets) of coloured ink onto the fabric
  • the ink jet is controlled by a computer and fired according to the digital image
  • a sudden pressure wave is applied to the ink
  • pressurised ink is fired onto fabric
27
Q

What are the 2 main types of inkjet printers?

A
  • charged drop printers (continuous)

- drop on demand printers

28
Q

There are 2 ways pressure waves are produced in inkjet printing. Name them.

A
  • thermal: high temp boils ink units a bubble forms and drops to fabric (mainly used for paper
  • piezoelectric: a special ceramic material which deforms when high voltage is applied, firing ink droplet. Mainly used in textiles.
29
Q

What are inkjet inks made out of in percentages?

A
  • 6% dye
  • 70-80% water
  • 20% humectant
30
Q

What kind of dye is used for cellulosic fibres in inkjet printing?

A

Reactive

31
Q

What kind of dye is used for protein fibres in inkjet printing?

A

Acid

32
Q

What kind of dye is used for polyester fibres in inkjet printing?

A

-disperse

33
Q

What fabric pre-treatments are used before inkjet printing?

A

fabric is padded with solution of:

  • thickener (to hold design)
  • fibre swelling agent
  • dye fixation chemicals
34
Q

What are the disadvantages of inkjet printing?

4

A
  • needs specific fabric pre-treatment
  • lower colour yield
  • more restricted colour range
  • high machinery and ink costs
35
Q

Name 3 applications of digital printing

A
  • sample printing
  • swimwear
  • banners

Printing Process & Techniques Year 3 (6 decks)

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