crease for folding

What is the profile of the strip used for creasing?

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Not sure what you are asking here. Scoring matrix comes in a variety of sizes based on the paper you are working with.

See here for an explanation:

Hope that helps,

I am using a type high strip that actually can print a very thin line. I am placing paper on the platen on each side of the crease line. This works fine on thin paper, but on Crane’s Lettra 110 lb. the paper is coming apart on the outside of the fold. I have read comments on this site and tried some solutions but none seem to work.
I figure one of two things at this point;
I am not using the correct strip for scoring
110# paper will tend to do this

Are you impressing the score on the outside surface of the fold? You could do either way, but standard practice has been to make the score on the outside surface of the fold as it stretches the paper fibers and helps them to bend without breaking apart.

If the rule you are using has too thin a face, it may not be stretching the fibers enough, as well.

How wide is your rule? I’m thinking it’s too thing, or the face may also be too square.

Hi, Allan—
Scoring rule is usually two points wide and has a rounded edge. (Sometimes the “face” of the rule has been
ground to one point width, or built up to three points width,
but almost always is two points.) The rule is made in a
variety of “heights to paper”. It sounds like your rule is “type-
high”, that is .918 inch. I score frequently on Heidelberg
platens, and prefer an .900 rule to use with creasing matrix.
In the old days before matrix (or at least before I knew about it), we used to score using a “string” score. I won’t
go into the details, because matrix is better 99% of the
time. For a string score, I discovered that .912 rule seemed to work best. It could be that you are using too
high a rule and/or too narrow a matrix, and the effect is to
cut the sheet. Matrix is made in a variety of channel widths.
It sounds like the stock you are using is heavy and would require a fairly wide matrix. Sometimes it’s necessary to
experiment a bit to find the combination of rule and channel that works best.
It’s also possible just to score against several layers of tape, but matrix gives a considerably better score. You may
also have to adjust the packing (if you are scoring on packing instead of a die-cutting jacket) or the impression.
I agree with jhenry that the outside of the piece should face
the rule, and the inside, the matrix. Good luck!

Makers of textured card stocks recommend a slit score, in which the paper fibers are cut, instead of crushed as with a score rule. This may be applicable to your stock. You can try it with a .918” cut rule in place of the traditional score rule. Packing is essential to achieve a smooth, even slit score, no deeper than 1/4 of your stock thickness.

A three or four thousandths cut into #110 Lettra should be just enough to cut into your stock, and prevent the fibers from “… coming apart on the outside of the fold.” that you mentioned.

We stock scoring rule in 2, 4 and 6 pt widths, all typehigh. Most of the time, 110 lettra will score fine with a 4 or 6 pt rule on a soft packing. But if it cracks, my trick is to lay down 4 or 5 pieces of masking tape, make an impression, cut out the impression on the tape with straight edge and razor, and put down one more layer of tape to cover it all up, basically making my own matrix. This makes a nice fat rounded score.