papermaking basics
DESCRIPTION
There are hundreds of text and cover papers, but most digital printers rely on a few favorites—usually choosing white and smooth papers. But there are a host of fine paper qualities that can make or break a job on press. The more you understand these, the better able you are to make the right choice. This presentation is like a virtual mill tour. It’s intended to help you understand these critical digital paper qualities combined with enough “did you know” content to make you a hit at your next trivia competition. Brought to you by Mohawk MakeReady, this presentation can be used by your printing business for internal training initiatives or customer presentations.TRANSCRIPT
October 2011 | Papermaking Basics
The qualities that can make or break your job on press.November 2011
1
October 2011 | Papermaking Basics
Interesting paper fact:
The word "paper" comes from the
name of the papyrus plant that grew
wild along the Nile River in Egypt
about 4,000 years ago. Ancient
Egyptians used to pound the leaves
flat and use them to write on.
2
October 2011 | Papermaking Basics
Common ingredients of Paper
Pulp
Cotton
Postconsumer waste fiber
Broke (Mill waste fiber)
Water
Calcium Carbonate
Coating
Sizing
Dyes and Colorings
Optical Brighteners
Fillers
3
October 2011 | Papermaking Basics
Important forest information
1.5 Billion seedlings are planted each
year. More than 4 million new trees
planted each year. Just like corn,
grain and other crops, trees are a
renewable resource.
4
Source: www.tappi.org
October 2011 | Papermaking Basics
Pulping:Has a porridge consistency at start, but we recommend not eating it.
5
October 2011 | Papermaking Basics 6
The Papermaking Machine
October 2011 | Papermaking Basics 7
Drying the paper
In the dry end, huge metal cylinders
are heated by filling them with steam.
The wet paper passes through these
hot rollers. Heating and drying the
wet sheet seals the fibers closer and
closer together, turning them
gradually from pulp into paper.
October 2011 | Papermaking Basics 8
Coatings and Surface Treatments
After the initial drying, coatings or special surface treatments can be added – such as Mohawk’s proprietary i-Tone, Inxwell, and Digital Imaging Surface.
October 2011 | Papermaking Basics 9
Pulp becomes Paper
When you look at a piece of paper, can you find any difference in thickness in that single sheet? Probably not, thanks to a part of the paper machine called the calender - big, heavy cast iron rollers that press the drying paper smooth and uniform in thickness.
A bit more drying, then rolled onto a big spool or reel, the pulp - a miraculous mat of fibers from trees - has become paper, ready for a thousand uses.
October 2011 | Papermaking Basics 10
Notable Qualities of Paper•Formation: the uniformity and distribution of fibers within a sheet
•Opacity: the measurement of light passing through
•Brightness: the percentage of light reflected
•Surface: finish or smoothness affects ink holdout
October 2011 | Papermaking Basics
Interesting Paper fact:
Every day, U.S. papermakers recycle
enough paper to fill a 15-mile-long
train of boxcars.
11
October 2011 | Papermaking Basics 12
Mohawk’s family of papers
With over 300 items in the Mohawk
Digital portfolio, Mohawk offers the
largest portfolio of products in the
paper industry which are specifically
engineered for digital printing. For
more info click:
Offset vs. Digital Sheets (Article)
Why Choose a Digital Sheet? (Video)
Digital DNA (PowerPoint)
October 2011 | Papermaking Basics
Mohawk MakeReady provides practical tools
and actionable information for digital
printers like you.
13
We can help…
Visit: www.MohawkMakeReady.com to browse content, request a meeting, or join the community.