What factors affect folding endurance?
Folding Endurance (Double Folds)
Currency paper has the highest folding endurance. The factors that affect this property of paper include fiber length, strength of fiber, moisture content, use of fillers etc.
Why is folding endurance important?
Folding endurance is a very important indication of the durability of archival papers. A decline in folding endurance is the most sensitive indicator of aging and deterioration of paper.
Why is grain direction of paper important?
The grain direction of the paper is important when binding books, because paper is scored and folded. … Folding parallel to the grain is easier and the paper is less likely to “crack,” create a rough fold and result in a bulky binding edge. It also helps book’s pages to turn easier, stay open and lay flatter.
How is paper formation related to grain direction?
Paper grain is the direction of fibers in a sheet or web of paper, generated during paper formation. As paper moves forward along the forming wire on a papermaking machine, the fibers align themselves in a direction parallel to the direction of wire travel through the machine.
How do you determine the folding endurance of paper?
Fold endurance measures the durability of paper when repeatedly folded under constant load; determining how many times the paper can be folded until it breaks. The folding strength is quoted as the number of double folds and the folding endurance is the log10 of the number of double folds.
How do you measure folding endurance?
In paper testing, folding endurance is defined as the logarithm (to the base of ten) of the number of double folds that are required to make a test piece break under standardized conditions: F = log10 d, where F is the folding endurance and d the number of double folds.
What does direction of the grain mean?
(Wood) In wood, grain direction refers to the longitudinal, or vertical, axis of the trunk, along which the structural cells are elongated (Cronyn 1990). It is the texture seen on the cut surface of a piece of wood.
How do I know if my paper is long grain or short?
Short Grain – The grain runs parallel to the short edge of the paper. Long Grain – The grain runs parallel to the long edge of the paper. A quick way to tell the grain direction is by reading the package the paper came in. The second number in the paper’s dimension indicates the grain.
What is graining in printing?
Graining can also mean the production of any artificial texture on any surface. For example, in printing, making the smooth metal sheets used in modern printing processes coarse. A stoneworking equivalent of graining is marbling.
Which way does grain run?
What does across the grain mean?
Almost every recipe asks you to “cut steak across the grain” when preparing or serving. … Cutting against the grain means to cut through the fibers and make them shorter. This makes the meat more tender and easier to chew.
Why is wood grain direction important?
The grain of the wood is probably the most important part of the wood as it determines the strength and texture of the wood. … The fibers are placed in a longitudinal direction and any piece of wood is easier to cut with the grain and the cut will be cleaner with fewer splinters. A piece of wood is a natural polymer.
What happens if you try to plane end grain in the same way as side grain?
Always try to plane with the grain rather than against the grain. Planing against the grain can cause the wood to tear out. … In a similar way, wood also has a direction in which the fibers feel smooth, this direction is commonly called “with-the-grain”.
How does grain direction affect the strength of wood?
When you split wood with the grain, you’re breaking lignin bonds (easy); when you break across the grain, you’re snapping cellulose fibers which is much harder. To take full advantage of a wood’s strength, pay attention to the grain direction. Always orient the grain so the fibers support the load.
Which way does the grain run in a tree?
straight – grain which runs in a single direction along the cut wood, a product of a straight growing tree. cross – grain in which some cells grow out from the major growth axis of the tree. spiral – grain which develops as the trunk of the tree twists in development.
How do planes go across the grain?
Can you hand plane cross grain?
Depending on how much material you need to take off, you could run it through a drum sander, or do the hand tool route and you a hand plane. Either way, you do not want to send parts through a planer cross grain. It is unsafe, bad for the tool, and will not produce a satisfying product in most cases.
How do you prevent end grain splitting in planing?
You can prevent splitting by clamping a small scrap block to the edge. Another way to plane end grain is to make use of a shooting board. It guides the plane to cut a perfectly square edge (or a bevelled edge if you want), and holds the workpiece in such a way as to prevent splintering of the end-grain fibers.
Do you plane against the grain?
No matter which way you feed the wood, you’re planing with the grain part of the time and against it the other part. When you’re planing against the grain, the knives tend to lift the wood fibers and tear them out, leaving the surface chipped and gouged.
Do U plane with the grain?
The direction you plane matters if you want to avoid tearout. … You want to plane in the direction the grain is rising. The usual analogy is to treat the board as you would the fur of cat–plane so the grain lies down. Another method is to look at the end grain and identify the heart side of the board.