long grain or short grain?

mga kapatid ano po ba ang best position ng pasok ng papel sa offset machine, long grain or short grain?
maraming salamat po,

generally long grain.
additional processing (folding, binding, etc...) may need to print on short grain, depends what you do after printing...

klaro ko lng kapatid. kung ang machine ko ay 19"x25", ano ang papel na dapat kong bilhin? 25"x38" or 38"x35"?

salocin wrote:

klaro ko lng kapatid. kung ang machine ko ay 19"x25", ano ang papel na dapat kong bilhin? 25"x38" or 38"x35"?

Para siguradong walang mali, pagorder mo ng papel (25 x 38 or 38 x 25) sabihin mo "SHORT GRAIN".

goodam, please help me understand paper grains, short grain ba ang pag pasok sa offset machine everytime? let us say 25x36 ang offset machine tapus ang paper c2s 100 size 25x38 ang stock. pag size nang paper 25x38 ang stock pag short grain pinag uusapan it means paper fiber lines is pa horizontal or vertical? and last question does short and long grain applies to all types of paper when printing? specially c2s paper and boards?

rsyu_88 wrote:

goodam, please help me understand paper grains, short grain ba ang pag pasok sa offset machine everytime? let us say 25x36 ang offset machine tapus ang paper c2s 100 size 25x38 ang stock. pag size nang paper 25x38 ang stock pag short grain pinag uusapan it means paper fiber lines is pa horizontal or vertical? and last question does short and long grain applies to all types of paper when printing? specially c2s paper and boards?

Long grain means that the grain direction of the stock is along the long side. On a 25 x 38 stock, that would mean the 38 side.
Short grain meas that the grain direction is along the short side. On a 25 x 38 stock, that would mean the 25 side.

When running a job, stock expansion would normally occur against the grain of the stock. When running full color jobs on single or 2-color presses, the grain direction of the stock should be parallel to the gripper or perpendicular to the direction of the stock feed. The reason for this is because image can be stretched to compensate for stock expansion by adjusting (tightening the adjustment screws) the plate clamps to stretch the plate.

When running a 25 x 38 stock on a 25 x 38 press, the stock should be long grain; because the long side (38) is parallel to the gripper.

Hope my explanation is clear. Mahirap kasi magpaliwanag kung walang illustration.

presstech wrote:

rsyu_88 wrote:

goodam, please help me understand paper grains, short grain ba ang pag pasok sa offset machine everytime? let us say 25x36 ang offset machine tapus ang paper c2s 100 size 25x38 ang stock. pag size nang paper 25x38 ang stock pag short grain pinag uusapan it means paper fiber lines is pa horizontal or vertical? and last question does short and long grain applies to all types of paper when printing? specially c2s paper and boards?

Long grain means that the grain direction of the stock is along the long side. On a 25 x 38 stock, that would mean the 38 side.
Short grain meas that the grain direction is along the short side. On a 25 x 38 stock, that would mean the 25 side.

When running a job, stock expansion would normally occur against the grain of the stock. When running full color jobs on single or 2-color presses, the grain direction of the stock should be parallel to the gripper or perpendicular to the direction of the stock feed. The reason for this is because image can be stretched to compensate for stock expansion by adjusting (tightening the adjustment screws) the plate clamps to stretch the plate.

When running a 25 x 38 stock on a 25 x 38 press, the stock should be long grain; because the long side (38) is parallel to the gripper.

Hope my explanation is clear. Mahirap kasi magpaliwanag kung walang illustration.

Thank you for the information, lets say that i have a 19x25 press machine, so i need to order a 38x25 stock paper? and just want to add why some of the press operator told me they dont need to follow grains if the job is leaflets even if its full color. how about c2s boards? do they also expands when get wet? sorry for so many questions

If you are running leaflets in 1 up layout, the image may be too small to be affected by paper expansion. If your machine is 4-colors, the stock will not be able to expand between the printing units, so grain direction is not important.

Some causes of stock expansion are:
1. High humidity in the press room
2. Rainy weather
3. too much dampening of the plate

Some solutions to stock expansion are:
1. Air conditioning or dehumidifying the press room and stock room
2. Acclimatising the stock by dry running (w/o ink)
3. Using machines with alcohol damping

Presstech said..... "Mahirap kasi magpaliwanag kung walang illustration."

Let me help you Presstech! Ganito lang ka-simple ipaliwanag yan. Iniiwasan ang paper expansion during printing to minimize misregistration! Humahakab (umaayon) ang Long Grain sa cylinder circumference during impression kaya ang movement (stress) ng papel papunta sa puwetan ng papel. It means palayo sa gripper.

Samantalang ang Short grain, lumalaban sa cylinder circumference kaya ang stress o pitpit ng papel during impression ay papunta sa left and right side ng papel o papunta sa bearer side! Kaya sa gitna pa lang ng "patama" or marker ay malaki na ang "galaw" ng rehistro. Ang isa sa dahilan nito, naglalaban o naghihilaan ang gripper bite at ang stress ng papel...kaya nagkakaroon ng lobo o hangin in between ng papel at cylinder surface!

Kaya kung maliit ang size ng papel para sa job, umorder ng mas malaking size Short Grain para paghati nito lalabas... long grain!

Salamat poh!

ea wrote:

Presstech said..... "Mahirap kasi magpaliwanag kung walang illustration."

Let me help you Presstech! Ganito lang ka-simple ipaliwanag yan. Iniiwasan ang paper expansion during printing to minimize misregistration! Humahakab (umaayon) ang Long Grain sa cylinder circumference during impression kaya ang movement (stress) ng papel papunta sa puwetan ng papel. It means palayo sa gripper.

Samantalang ang Short grain, lumalaban sa cylinder circumference kaya ang stress o pitpit ng papel during impression ay papunta sa left and right side ng papel o papunta sa bearer side! Kaya sa gitna pa lang ng "patama" or marker ay malaki na ang "galaw" ng rehistro. Ang isa sa dahilan nito, naglalaban o naghihilaan ang gripper bite at ang stress ng papel...kaya nagkakaroon ng lobo o hangin in between ng papel at cylinder surface!

Kaya kung maliit ang size ng papel para sa job, umorder ng mas malaking size Short Grain para paghati nito lalabas... long grain!

Salamat poh!

Ayus....

ea wrote:

Presstech said..... "Mahirap kasi magpaliwanag kung walang illustration."

Let me help you Presstech! Ganito lang ka-simple ipaliwanag yan. Iniiwasan ang paper expansion during printing to minimize misregistration! Humahakab (umaayon) ang Long Grain sa cylinder circumference during impression kaya ang movement (stress) ng papel papunta sa puwetan ng papel. It means palayo sa gripper.

Samantalang ang Short grain, lumalaban sa cylinder circumference kaya ang stress o pitpit ng papel during impression ay papunta sa left and right side ng papel o papunta sa bearer side! Kaya sa gitna pa lang ng "patama" or marker ay malaki na ang "galaw" ng rehistro. Ang isa sa dahilan nito, naglalaban o naghihilaan ang gripper bite at ang stress ng papel...kaya nagkakaroon ng lobo o hangin in between ng papel at cylinder surface!

Kaya kung maliit ang size ng papel para sa job, umorder ng mas malaking size Short Grain para paghati nito lalabas... long grain!

Salamat poh!

Sana Lahat ng paliwanag ganito kalinaw....alam mong di ka pinapaikot lang.... oks ka dre..taas dalawang kamay ko sayo

jhondbaptist69 wrote:

Sana Lahat ng paliwanag ganito kalinaw....alam mong di ka pinapaikot lang.... oks ka dre..taas dalawang kamay ko sayo

Sir, kilala ko si Presstech. Hindi siya sadyang nagpapaikot ng kausap. Minsan natulungan din niya ako sa mga problema ng imprenta ko.
Peace!

hello guys newbe here.