The root cause of wireless glue sticking quality issue two

Insufficient awareness of modern bonding materials

There are two types of adhesive materials used for binding, one is a cold hydrosol; the other is a thermoplastic adhesive, which needs to be used after the hot melt is qualified. The form of bonding of adhesive materials is divided into permeation type, suction type and semi-permeable type (also called semi-absorbent type). The three types of bonding materials used are different from the types of adhered objects, and the bonding effect is also different. Different.

China's binding materials for binding have used cold glue for a long time, cold glue is a water solvent, and its drying method is to set the shape by heating and pressing with the temperature and time. However, the commonly used thermoplastic adhesives are different, such as EVA hot melt adhesive, which is a solid, moisture-free, fusible adhesive material that uses the appropriate melting point (softening) temperature, operating temperature, Open time, curing time and cooling hardening time, and then the correct clamping and shape, in order to achieve a reliable bonding effect. Because EVA hot-melt adhesives are subject to many influences during use, such as the temperature and humidity of the factory building, the speed of operation, the texture of the paper, the differences in adhesive and adhesive, and the temperature of the adhesive, etc., all are related to the processed products. The pros and cons have a direct relationship.

In addition, there are many publishing houses that require that the thickness of the book's backing glue be as large as possible, and that the more the coating is applied, the more solid it is. This is a misunderstanding. In fact, the fastness of the book book connection is in some sense more than the thickness of the glue. Firmness does not matter. Because the adhesive strength, viscosity, viscosity, etc. can determine the fastness of bookbinding. When the backing glue has the strength, viscosity, and viscosity to meet the requirements of the standard, the adhesive layer should be “thin and even”; the over-coating of the backing glue can only cause the back of the book to be uneven, difficult to read, unsightly appearance, and waste of rubber.

There are many kinds of cold and hot glues used in binding materials, among which the EVA hot melt adhesive has different bonding due to the different sources of basic materials, the types of auxiliary materials, and the differences in the price of various kinds of ingredients. effect. Therefore, we must have a full understanding of modern new materials (including cover materials, paperboard, etc.), strengthen learning, use theory to understand and apply them to practice, record usage experience at any time, and summarize it. Improve and meet the desired requirements.

Publishers have less communication with the binding processing plant

In the past few decades, people engaged in design (especially beauty editing) in the publishing industry often contacted the technicians and masters of the binding and processing plants to learn the opinions of the binding workers in order to improve and improve the design plan and achieve the design expectations. Consistency in product completion (imagination is consistent with the destination), many high quality products that have won international and domestic awards. There are many well-known US-made artists who have taken the initiative to make friends with the binding factory and masters, to learn binding techniques from them, and to learn about various techniques to better design more excellent works. However, in recent years, this kind of communication has been too little. At present, some younger American editors generally only pay attention to news on the computer, and they are not diligent to go to the factory to learn and learn from the masters the knowledge that is not available on the computer, and forget about practice. The truth of true knowledge. Some also believe that it is an artist who engages in designing, is a future artist, has no knowledge in the factory to learn knowledge from the workers, and so on, so that he has suffered a lot of loss and learned less knowledge. Therefore, there are many problems in the design, selection of materials on the size specifications, etc., the following list several phenomena.

1. Disregard the value and effectiveness of books, blindly pursue the development of wireless adhesive processing

The book's use (reading) value, preservation value, and the correct choice of binding process methods and types of binding materials are directly related. Generally, if there is a preservation value of high-grade books, you should choose a long-term preservation of the fine dressing process; binding materials must also match the grades of books in order to obtain the desired effect; general books can choose universal mounting processing; simple and short-term use of books, The simplest installation method can be used. However, it can be seen from the book market and the national publication situation that there are a number of wireless glue bindings. At present, it accounts for more than 60% of all books. The author does not deny that wireless glue has many advantages, such as fast publishing, short cycle, suitable for modern rhythm, low labor cost, etc.; but this processing method also has many deficiencies, such as: 1 resin adhesive is easy to aging , not easy to long-term preservation; 2 thick books are not easy to read and change; 3 bond is not strong, easy to page, break, etc., become the most binding book quality of the installation.

However, some publishers are eager to publish their books and want to reduce costs, and the cost-effective thick-books that should be booked in hard copy or hard-covered books are simply made into a thick paper-backed wireless glue-bonded book. As a result, both parties to the problem are entangled. Unclear. Hebei has a press to do a 32-inch (A5) size, 48mm thickness of the book, indirectly asked the author can process wireless glue fixed paperback? At that time, the author replied: "No! Or hardcover, or 2 or 3 volumes to make a glueless binding...." It can be imagined that for example, a book with such a small thickness was actually made into a wirelessly-defined paperback. Yes: A. can not be read (do not hold and can not see); B. the front of the incision is not uniform, and the belly turned out to become a collapsed circle; c. the appearance of the whole book changes; D. page off, off the core fracture book; E Bonding is not strong, shortens the life of books, and cannot be stored for a long time.

China is the oldest bookbinding technology in the world, and it is also the country with the most binding methods, styles, and ages. There are more than 10 kinds of binding methods. There are also 4 or 5 kinds of commonly used methods. The scope of choice is wide, but the current situation It is not quite normal to see what kinds of books are made with gluelessly bound paperbacks. Of course, the use of this application should not be used when it should not be used, and it eventually causes troubles, so that valuable books can not be properly saved and used.

2. There are numerous problems caused by cover selection and design. There are many books that do not take into account the processing difficulties and effects in the selection of cover materials, resulting in various quality problems. The following lists one or two cases for analysis.
1 There is a great difference in paper thickness between the cover paper and the book block. In order to improve the book binding effect, there are many books nowadays with a great difference between the thickness of the book cover and the thickness (or weight) of the book block paper, resulting in a difference in pull strength between the two. When the book is bound, the cover lifts the first page of the book block and exposes the glue. At the end or sample page, causing unqualified products, publishers and processors have conflicts. Such products can solve the problem of leaking rubber by adding a one gram (thickness) intermediate ring or lining between the cover and the first page of the book block, but many publishers simply do not plan to reduce costs. Does not consider the processing effect.
2 The cover material is improperly fractured. Now that the thickness of the cover is getting bigger and bigger, more than 200 grams of paperboard or paper design has a folding front process, and when the creases break, the crease breaks and breaks the bottom, destroying the appearance quality of the book. In fact, if the front cover of 200g or more is to be folded, it will make the binding of the book very difficult, and quality cannot be guaranteed. Therefore, it also causes quality problems.

3 The cover length is shorter than the length of the book block resulting in dirty books. When the book is bound and processed, most of the cover length is about 7mm shorter than the length of the book block. As a result, when the book is glue-glued, the back end of the book is short, resulting in a leaky part of the back of the book. This can be completely avoided if the cover is designed with the size of the edging at the head and feet.

4 Design patterns leave no room for processing. In addition, when the design of the cover of the design and the frame was finished, there were beauty books that took into consideration the difficulties in binding and processing, did not understand the requirements of the binding quality standards, and deliberately pursued the appearance of beauty, resulting in less than expected results when binding. If a certain processing unit receives a paperback book of a certain publishing house with a thickness of 12mm, the back of the cover design is divided into full white and black characters, and the first and the fourth full version are black and white characters, and the processing factory is required to process it. The cover must not be exposed and the book must not be blacked out. This requirement is too difficult. According to the national CY/T28-1999 binding quality requirements and inspection methods, "3, 4, 5, Article": Book back translation error is based on the back center line of the book, the book thickness is less than 10mm, the book back word translation tolerance For ≤1.Omm, for books with a back thickness greater than 20mm and less than or equal to 30mm, the tolerance for the translation of the book back is 2.5mm, and for books with back thickness above 30mm, the translation tolerance for the back of the book is both 3.0mm. The tolerance of skewness is less than the tolerance of the translation of the book back by 0.5mm, so how can this black-and-white design meet the demanding requirements of the processor and achieve the desired result? There are too many examples. Hopefully the publisher wants to With the bookbinding processing unit to understand more often, correctly understand the overall concept of a book, to make a book together.

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