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Categories: Book printing >> Support Center
How to Make Books Perform Lay Flat
Origin:Image Printing  Data: 8/15/2011  Keywords: book printers, offset printing jobs, offset printing
If book printers try to make the books perform lay flat as could as possible, they could get some ideas of design, material and binding etc, but main of them can be found as below.
First for such offset printing jobs, in order to make the book lay flat, book printers should choose smythe sewn binding which will allow the spine flexibility. If you prefer to perfect binding, the PUR glue but not EVA/PVA glues should be applied. PUR glue also make the spine soft and flexible than regular EVA/PVA glues. This is the first step to make a book lay flat.
Certainly, this kind of book should be flex bound but not casebound. This is also very important. There is no stiff grey board applied to flex bound like casebound in offset printing jobs. Normally bible board or light CCNB can be used in flex bound case in purpose that the book looks elegant. If you have no cost problem, you can use genuine leather, PU leather or bonded leather as flex bound materials. There are much difference of flexibility between these leathers. Among of them, genuine leather is the most flexible but expensive, PU leather is the cheapest but softer than bonded leather, Bonded leather is much closer to genuine leather in raw material and texture but the stiffest. Book printers can choose from them according to their performance and cost.
There are three mature categories of genuine leather for book binding materials. They are from pig, cow and sheep. Now in China mainland, there are no qualified supplier to sell pig genuine leather, because pig genuine leather is thinner than cow leather, it is harder to generate than cow leather, so the cost is higher than cow leather. In order to make pig genuine leather suitable for book binding, the suppliers normally coat one lay of glue to bind easily. So pig genuien leather feels not softer than cow genuine leather. Due to this extra work, pig genuine leather is slightly more expensive than cow genuine leather. Cow genuine leather is a little cheaper and stiffer than sheep genuine leather.
If book printers China try to use genuine leather in their offset printing jobs, they can consider the products from Cromwell Leather Group. Cromwell provides qualified bonded leather and genuine leather (Saderra and Jewel-Tone) imported from USA manufacture. But for cow genuine leather, some China mainland suppliers are able to produce with good quality.
Lay flat function does not come from only above points, material grain is a vital factor to realize lay flat. Normally we try to apply text paper in right grain, but if text paper is light weight like 60gsm, we can consider cross grain. For bible board or CCNB, it definitely should be right grain for all book printing jobs, otherwise, some potential quality risks might be caused. 
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As a professional book printing factory in China, Image Printing Packaging Ltd focus on book printing and packaging printing mainly for oversea and domestic customers. We are located in Shenzhen city, the book printing and packaging printing industrial center of China and even worldwide. Please be kindly note we offer a wide range of professional customed printing service with aggressive prices
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