In the selection of hot melt adhesives, it is necessary to select and use hot melt adhesives of good quality and excellent cost performance. This is an effective way to ensure the quality of book binding, reduce the cost of using glue, and improve the overall economic benefit. The quality problem of "the bottom of the textbook" appears. From the perspective of the performance quality of hot-melt adhesives, the hot-melt adhesives have low tensile strength and hardness, and low melt viscosity. With the same thickness of the adhesive layer, hot melt adhesives of different qualities vary greatly.
There are two main reasons for the quality problem of hot-melt glue-bound books: one is the quality of hot-melt glue (this is the basis of the quality of the book): the second is the hot-melt glue binding process The management of the quality of the back of the book (this is very important). The above two factors are interrelated.
From the perspective of process operation, the existing hot-melt glue binding process book pages are not pulled apart and pushed flat. Once pulled and pushed flat (seeing the edge of the paper or the glue layer), it will greatly reduce the book page. Adhesion, so that loose pages and page breaks occur. The purpose of the milling groove on the back of the book is to increase the bonding area of ​​the hot melt adhesive to the pages of the book and increase its tensile (folding) strength. Therefore, the quality requirements of the milling groove must be met in the process operation. The depth of the milling groove on the back of the book (depending on the condition of the paper) should reach 1-1.5 mm, and the opening angle of the groove is 60 ° ∧-type groove (repairing is necessary when the angle is small). Due to the inadequate design of the disc binding machine (straight line machine) (milling without blade support) and manufacturing precision error, the adjustment of the knife is difficult, so the depth of the groove may only reach about 1.2 mm, which requires careful adjustment by the operator , Keeping the depth of the milling groove is the same, which is an important link to ensure the quality of perfect binding.
In a word, in order to make the bound book do not loose pages and fall pages, so that there is sufficient tensile (folding) strength between the book pages, it is necessary to choose hot melt adhesives with good quality and performance. In the process operation, pay attention to the quality of the milling groove, pay attention to the influence and change of the temperature of the hot melt adhesive on the melt viscosity, so that the hot melt adhesive can achieve the proper penetration and bonding strength of the paper.
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