ENP Images

June 8, 2009

Printing Special Effects

Filed under: Printing — Tags: , , , , — ewwink @ 1:47 pm
There are several treatments in printing that are considered special processes. Not many printing companies do this in house and many of these processes are sent out to graphic finishers that specialize in “finishing work”. Foil Stamping, embossing, combination stamping, and die cutting are the most common that we will discuss.

Foil Stamping can be either a flat foil stamp or a combination stamp where the image is raised above or below the surface of the sheet. Foil stamping is the process where foil is transferred to the substrate(paper) through heat and pressure. The pressure is applied through the die that carries the image to a platen of a letterpress usually. The platen is also heated to release the foil to the substrate. Dies are made of metal and the most common metals used are: Brass, Copper and magnesium. Combination stamp dies actually carry the depression of the image while the counter die carries an exact opposite image. The paper is then squeezed between the two with heat to transfer the foil and emboss the image at the same time. Combination stamp dies are more expensive to make but that is the only sum cost difference between flat and combination stamp jobs.

Embossing is basically a very similar process to foil stamping only there is no transfer of foil. The level of the image is either raised(embossing) or lowered(debossing) from the original level of the paper surface. Blind embossing is where the image that is being raised has no ink on it. If you emboss and need to register to the ink it is called color register embossing. On embossing a die and counter die are always needed to be able to emboss the paper between them. This pressure will flatten the paper fibers to help create an image. Heat can be used to enhance the image by actually helping to iron the paper to a smooth finish.

Die Cutting is a process where a steel rule die is used to cut the paper into the desired shape of the die. This is how pocket folders and other shaped pieces are produced. They are usually printed on square or rectangular sheets and then die cut to create the desired shape. Then the die cut piece is scrapped out of the sheet either by the press itself or by hand. Nicks are put in the die to prevent the piece from falling out in the die cutting press itself. Pocket folders, brochures, direct mail, postcards, flyers are all pieces that can be diecut to special shapes.

Kiss Cutting is a diecutting process where the die cuts through the first layer of the material but does not cut through the backing. Most commonly used on label material to help the label to be easily peeled off the backing. Diecuts can be in any shape or size. Kiss cutting is usually done on a letterpress machine such as a Kluge or Heidelberg windmill. It does involve a steel rule die. The pressure is adjusted to cut just through the first surface but not the base material.

All of these processes are done in house at The Odee Company.

May 26, 2009

Bindings for Printed Products

Filed under: Printing — Tags: , , , , — ewwink @ 3:31 pm
How many different ways can you bind printed products? There are numerous ways you can bind manuals, books, calendars, guides, directories, catalogs, full color brochures and all other printed products. Here are a few very basic guidelines:

Looseleaf-Printed sheets are loose and have holes drilled in them to put in a binder.

Tape Binding-Usually done on demand copy type where it is actually done in line and comes out of the machine finished. This simulates perfect binding but has no grind on the spine and the tape shows.

Side Stistching-Staples go through the front of the paper to the back but are stapled on the side of the sheet.

Saddle Stitching-The pages are stitched by staples through the spine of the book. The pages have to be done in 4 pg increments and there is a limitation to how many pages can be stitched.

Perfect Binding-This is what you usually buy in a book store when you get a soft cover book. It gives you a square spine and the paper is actually ground on the spine and then glued to the cover. This can now be done both conventional and on demand. There are many cousins of perfect binding(layflat,PUR,OTA,smythe sewn, etc.)

Wiro Binding-A wire of loops is inserted through punched holes in the paper in loops. This binding will lay flat.

Spiral Binding-Metal as above but in circles going through punched holes.

Plasticoil Binding-Plastic loops are put through the punched holes.

Case Binding-These are hard bound books like bought in a book staore. These can be smythe sewn, side sewn or adhesive bound.

These are the basic bindings that most printed products will be bound by.

May 21, 2009

Types of Digital Printing machines

Filed under: Printing — Tags: , , , , — ewwink @ 6:35 pm
Digital printing is a term that encompasses a lot of different equipment that produce different products and different levels of quality and expectations.

First let’s start with the term digital printing:

Digital printing’s definition is taking an electronic file and directly from that file creating your final output without going to plates or any other type of intermediary step or proof. It can be black or color.

The black is usually done by copiers on the low end and machines such as the Xerox Docutech or the Kodak Digimaster. These machines are capable of @ 100 copies a minute. Even these machines use toner although they are capable of higher resolutions than copiers. Although, higher quality than copiers the docutech & digimaster still don’t rival true offset quality of true offset presses.

The reasons these machines evolved and have become so popular is the ability to do low quantities at reasonable costs. They are limited as to the products and substrates that customers will use these machines for.The evolution of doing this same thing to color was a natural evolution. The higher the quality the better it could replace offset on the low end of the quantity spectrum.

Also as color digital printing machines improved customers deemed quality acceptable for more and more products and uses. Color copiers came first and use toner in the four base colors of CMYK to reproduce color photographs and images. The quality is on the low end for color and is susceptible to scratches and rubbing more than liquid ink. Then there is the classification of digital presses. There are toner and two types of liquid ink presses.

All of these color machines have strengths and weaknesses like any other kind of manufacturing process. Toner based machines are the IGen3 and the Nexpress. The quality is much better than color copiers but can still have toner look to them and sometimes don’t print smooth screenes. The only true offset entries are either Heidelberg or Ryobi machines. These actually produce temporary plates to produce the print job that is on press at that time.

This is true offset printing but has some limitations because the vast % of machines are small format and don’t have the ink carrying capacity that larger presses do. These machines also can’t print variable data printing where the image or text can be changed from sheet to sheet. The other liquid ink machine is the HP Indigo family. The Indigo 3050 can print variable data while rivaling offset quality.

The Indigo digital press family is the only machine that can print variable data as well as being capable of printing PMS spot colors as well. Customers will use this machine to print postcards, brochures, posters, sales sheets, flyers and any other printed product. These are your choices in digital printing. As final users have continued decreasing quantities of their orders and use more and more of customized marketing digital printing’s market share has increased. It is a powerful option to promote your business from small startups to large corporations.

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