Application Status and Market Analysis of Bookbinding Adhesives (II)

Second, application analysis
As for the quality of binding caused by adhesives, all parties in the industry agree that the main issues should be resolved from three aspects: the quality of adhesives, compatibility with other equipment and materials, and the quality of operators.

First of all, the anti-aging properties, high and low temperature resistance, and tensile properties of the adhesive directly affect the quality of the adhesive. The better the anti-aging property, the more collectible the book after the binding, the stronger the preservation. The stronger the resistance to high and low temperatures, the more adaptable to changes in ambient temperature and humidity. The tensile strength and Shore hardness are appropriate to avoid the occurrence of booklet breakage.

Second, consider the compatibility of adhesives with binding equipment, paper, and ink. Good binding equipment, suitable surface compatibility, and other suitable conditions can provide good adhesion.

After the above factors are properly controlled, the operator will also use his or her best efforts. For example, if the operator improperly controls the temperature, it will directly affect the adhesive effect.

Analysis of common faults
Due to the binding quality problems caused by improper use of adhesives, they are almost everywhere in the binding process. Sometimes it will cause unnecessary rework and waste for the next process. From the user's understanding of the main failures are:

(1) Failure caused by improper viscosity. The viscosity is not enough, and the adhesive is too thin to make the adhesive sheet fall off; if the viscosity is too large, the coated layer will be pulled off after the adhesive coated paper will cause the peeling off or the backing paste to be difficult to be separated;
(2) Excessive thickness of the adhesive may result in sticking or tearing of both ends of the back cover of the cover after overflowing;
(3) uneven application of adhesive to make the back cover of the book cover blisters;
(4) Adhesive is not wet enough to apply or dry, so that when the hardback is opened, the back of the book is cracked and the ring lining is pasted. The ring lining and the paper are bonded unevenly or blisters, or the surface of the book case blisters;
(5) The internal tension of the adhesive is greater than the external tensile force, the moisture of the paper is too large, and the resulting hardcover book envelope is upwardly warped after being fitted;
(6) There is no smearing of adhesive in the books and magazines, resulting in inconsistencies in the pressure slot of the hardcover book or failure of the slot.

Users call for refinement of technical indicators
The best open point for the adhesive is the best melting point that the hot melt adhesive can use to maximize its viscosity. Because of the high sensitivity of the adhesive to temperature, the tensile strength of the adhesive changes greatly at every 10Â°C, and the viscosity of the adhesive decreases as the temperature increases or decreases near the optimal melting point. The amplitude has also gradually increased.

However, adhesives on the market are not strictly limited to this. Experts and users call on manufacturers to specify the best open point for adhesives in the adhesive product description. For example, if the open point marked by a certain type of adhesive is in the range of 150-170Â°C, with a difference of 20Â°C, the viscosity of the adhesive will be very different in this range, which is difficult for the user to grasp and the bonding effect will not be sufficient. Play it out, which is not conducive to the use of operators, which directly affect product quality.

Third, explore development
The road to standardization
Faced with the various quality problems arising from the application of book binding adhesives in our country, how to effectively solve them, there are many opinions about this, and we hope to find a solution.

Experts advocate the establishment of relevant standards to regulate the adhesive market. There are different opinions among industry professionals on the quality standards that have been strictly formulated and revised. If the standard requires the glue layer to be uniformly limited within the range of 0.8 to 1.2 mm, the reasonability is questionable. Manufacturers reflect that the quality of the binding of bindings for inspection books should be based on the thickness of the adhesive layer or on the strength of the adhesive, which is debatable.

Is the development of the use of adhesive standards, or product standards, but also the point of controversy, to regulate the quality of adhesive products, should develop the corresponding product standards, but this is a cross-industry behavior, its feasibility is worrying. At the same time, it is the user who defines the standards that can be used in the use of the standard. This is subject to negotiation between the parties.

New PUR will wait and see
PUR hot melt adhesive is very suitable for the binding of books and magazines that need to withstand high external forces and use under severe temperature environment. It is mainly used for the binding of journals, annual reports and hardcover books.

The price issue of PUR hot melt adhesives is a barrier that is difficult to overcome. The promotion in China requires a process, which is the voice from the user side. Because on the one hand, PUR hot melt adhesive production technology has not yet been popularized, but only controlled by high-end enterprises, the price will not drop in the short term; on the other hand, PUR hot melt adhesive once contacted with air when melting, the performance will change, when operating There is a need for dedicated equipment to isolate it from the air, which increases the cost of PUR use.

However, all major printing equipment manufacturers that have significant influence in the world have recommended full promotion of PUR hot melt adhesives. They generally believe that PUR has superior performance compared to other adhesives and has better compatibility with the equipment. Although the price is relatively high, the amount of glue used is about one-third that of conventional glue, and the occurrence of failure is reduced. . This virtually reduces the cost and enhances its market competitiveness.

We look forward to cooperating and actively exploring all aspects to understand the status quo of the binding market for books and periodicals, continuously improve product quality, gradually standardize the market, and promote the improvement of glue and binding quality!

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Posted on February 23, 2019