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Home >> Bibles >> PVC/PU Cover Bible
PU Cover Bible Printing Services
PU Cover Bible
PU Cover Bible Printing Services supplied by Image Printing Packaging Limited with reasonable prices and high quality performance.
Our two web-fed press machines and qualified binding capacity enhance our roles as main player among China local bible printers.

More about PU --

Polyurethane (PUR and PU) is a polymer composed of the chain of organic units joined by carbamate (urethane) links, while the most polyurethanes are thermosetting polymers that do not melt.
Polyurethane polymers are formed by reproducing an isocyanate with a polyol. Both the isocyanates and polyols are used to make polyurethanes contain on average two or more functional groups per molecule. Polyurethane products should not be confused with ethyl carbamate, which is called urethane.
The properties of a polyurethane are greatly influenced by the types of isoyanates and polyols used to make it. Long, flexible segments, contributed by the polyol, give soft, elastic polymer. High amounts of crosslinking give tough or rigid polymers. Long chains and low crosslinking give a polymer that is very stretchy, short chains with lots of crosslinks produce a hard polymer while long chains and intermediate crosslinking give a polymer useful for making foam. The crosslinking present in polyurethanes means that the polymer consists of a three-dimensional network and molecular weight is very high. In some respects a piece of polyurethane can be regarded as one giant molecule. One consequence of this is that typical polyurethanes do not soften or melt when they are heated. The choices available for the isocyanates and polyols, in addition to other additives and processing conditions allow polyurethanes to have the very wide range of properties that make them such widely used polymers.
Polyols are polymers in their own right and have on average two or more hydroxyl groups per molecule. Polyether polyols are mostly made by polymerizing ethylene oxide and propylene oxide. Polyester polyols are made similarly to polyester polymers. The polyols used to make polyurethanes are not "pure" compounds since they are often mixtures of similar molecules with different molecular weights and mixtures of molecules that contain different numbers of hydroxyl groups, which is why the "average functionality" is often mentioned. Despite them being complex mixtures, industrial grade polyols have their composition sufficiently well controlled to produce polyurethanes having consistent properties. As mentioned earlier, it is the length of the polyol chain and the functionality that contribute much to the properties of the final polymer. Polyols used to make rigid polyurethanes have molecular weights in the hundreds, while those used to make flexible polyurethanes have molecular weights up to ten thousand or more.
The main ingredients to make a polyurethane are isocyanates and polyols. Other materials are added to help processing the polymer or to change the properties of the polymer. Isocyanates used to make polyurethane must have two or more isocyanate groups on each molecule. The most commonly used isocyanates are the aromaticdiisocyantes, toluene diisocyanate (TDI) and methylene diphenyl diisocyanate, MDI. Polyols are most easily classified as polyether polyols, which are made by the reaction of epoxides with an active hydrogen containing starter compounds, or polyester polyols, which are made by the polycondensation of multifunctional carboxylic acids and hydroxyl compounds.
They can be further classified according to their end use as flexible or rigid polyols, depending on the functionality of the initiator and their molecular weight. Taking into account functionality, flexible polyols have molecular weights from 2,000 to 10,000 (OH# from 18 to 56). Rigid polyols have molecular weights from 250 to 700 (OH# from 300 to 700). Polyols with molecular weights from 700 to 2,000 (OH# 60 to 280) are used to add stiffness or flexibility to base systems, as well as increase solubility of low molecular weight glycols in high molecular weight polyols.
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Whether this is your first book you are looking to get printed, or you are a publishing company looking for better pricing, you have come to the right place! As a professional printing factory in China, Image Printing focus on book printing mainly for oversea and domestic customers. We are located in Shenzhen city, as the best book printing company in China or even worldwide. Please be kindly note we offer a wide range of professional customed book printing services with aggressive prices. Hardcover and Soft cover Books is our specialty and we focus on serving those with bulk book printing requirements.
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