Though decoupage items may look like painted masterpieces, in reality, decoupage is all about adhering paper crafts or other mediums to a project is a seamless way. Not only does it aid in folding, but when done successfully, it achieves the commercial printers and designer's goal of faithful print reproduction.įree PDF download will open in a new browser window.Decoupage - Methods, Materials, and Project Ideasĭecoupage is a misleadingly easy craft to produce yourself. In high-quality commercial printing, creasing is thus the second critical strategy used to combat the fiber cracking problem. Sometimes simple scoring will eliminate splitting and fiber cracking, but as the sheets get heavier, this is less likely and the stronger compression forces of creasing are needed to prevent cracking. Creasing can be done by either a platen method (both sheet and die board are flat) or rotary method (paper passes between cylinders or wraps around a cylinder.) Both methods use a male die to force the sheet into a female channel, the dimensions of which vary according to the density of paper. As the fold continues, (left) the sheet further de-laminates internally and a rounded bead is formed on the inside of the fold, absorbing all the force, while the outside of the folded piece remains smooth and unbroken. When the sheet is bent (folded) at the crease, all the outward force that normally would split or crack the sheet is directed inwards towards the weak, delaminated line. Creasing refers to the internal de-lamination of a sheet by compression along the line where folding needs to occur (shown at right using the Technifold Tri-Creaser.) This effectively creates a "paperboard hinge" according to Kevin Carey of. They simply weaken the sheet to aid in folding. steel scoring blade between steel or rubber collars) are two examples. Press scores (litho score) and old style folding machine scores (e.g. For our purposes, Scoring is any method of reducing paper stiffness along a line in order to aid in folding. You'll also find the same terms have different meanings in the commercial printing versus the packaging industry. Often used interchangeably, there is indeed a difference in the processes we are referring to, no matter what you decide to call it. What's the Difference Between ‘Creasing' & ‘Scoring' Even if the 3 factors above are perfect, you'll find that when you get to cover stocks at around 7pt (.007") creasing (or scoring) paper is still needed, which is why creasing is important. We won't go into detail on these here there are numerous detailed technical resources available from the Printing Industries of America and from most paper and printing press manufacturers. The first strategy is to minimize the problem by examining these 3 factors through testing different papers, inks, coatings, varnishes and adjusting the humidity environment. A pressroom or bindery at 50% relative humidity will be less likely to have cracking problems than an environment at 25% relative humidity.
The paper structure varies with coating thickness, fiber content, length of fibers, bond between base and coating and how pulp is treated.Second, we'll see how creasing works and why it is an important solution. Some printed papers will fold just fine (usually text weight stocks and lightweight covers folding with the grain.) It is on jobs where fiber cracking or splitting occurs that creasing becomes important.Ģ Strategies to Handle the Fiber Cracking Problemįirst, let's look at 3 factors that affect the paper. Many jobs need to be folded after printing, and customers won't tolerate a finished, folded piece that's marred by any ‘cracking' or splitting of the sheet. The goal of the designer and printer is to reproduce a job as close to the original as possible, in any quantity.
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