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Perfect binding is the best way to bundle brochures, catalogues or other printed materials with a high number of pages. Up to 160 pages are possible for your high quality brochure with perfect binding. |
Different kinds of perfect binding
How does the perfect binding work? It works in different ways. To bundle the printed products cold or hot glue can be used.
Cold glue
In case of using cold glue technique casein glue will be applied to the spine of the brochure. Due to chemical processes it will connect strongly with the paper during the drying process.
Hot glue
Hot glue basically means the processing of granulated ethylene vinyl acetate (EVA-Hotmelt). At room temperature it is hard. This glue will be melted with 170°C. Then, during the time when it is good to process mechanical, it will be applied on the spine of a brochure.
Disadvantages for cold and hot glue
Both kinds of bindings also have disadvantages. Bindings with hot melt-glue do not last that long because the glue gets cold pretty fast so it can hardly enter the paper fibre. The cured glue works like a clip so it basically holds the brochure together. The hot melt film sets itself like a bar clamp around the inner sides (the content pages) of the brochure. It would make the brochure automatically shut down. To avoid this effect you usually push the pages down with the palm of your hand. Due to this it happens sometimes that the prudish hot melt glue on the spine of the brochure would break and the binding would not last very long.
This problem doesn’t exist if you use cold glue (with dispersion glue). Due to the long drying process of the glue the industrial usage will be lowered.
Polyurethane reactive glue (PUR)
For this reason a third solution for the perfect binding was found. It is the PUR perfect binding. By the way: This is exactly what we use.
PUR stands for polyurethane hot melt adhesives. Those were processed with 130°C and congeal while cooling down. For the final hardening the glue absorbs all the moisture from the surrounding area. During this process the glue becomes a carbamide what cannot be dispersed. It keeps all pages of the printed product strictly together. To sum up this way of perfect binding looks attractive and lasts pretty long.
Additionally the very first and the last pages will be pasted over about 5 mm to the inner cover page to make it much more durable. Here is an example for the first page:
The art work
The content pages
In connection with the pasting over of the first and last two pages keep in mind while crating your artworks that this 5 mm of the designed space will get lost because of the binding.
You need to put writings and pictures, what are not supposed to get cut off, more in the inside, away from the bleed.
In general: The content pages have to be created as continuing, separate pages. Please save them in a file with a clear name and use one of the following closed formats: PDF, JPG, TIFF, EPS, PS (PostScript).
The cover
Compared to the content pages the cover needs to be completely assembled and the back sides have to be added as well.
Strength of the back = number of content pages ÷ 2 x grammage ÷ 1.000
Once you prepared your artworks for the cover you need to save them as a separate file (file with two pages – the cover inside and outside). The name of the file should be related to the matter of the content pages. Please also use one of the closed file formats mentioned above.
Just in case four cover pages are not enough to present all information on the first view, you can use a six sided cover. Then you have to prepare your artworks just a little bit different: The cover page what is also the backside of the brochure needs to be 2 mm shorter and the additional cover page needs to be 4 mm shorter. That’s it!
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