Research on Quality of Wireless Binding (Part One)

First, develop a strict process plan before glueing

The wireless glue binding process is different from the wire binding process. The book block is made of hot-melt adhesives, and its process features impose high requirements on the specifications of the book block, folding accuracy, binding and compaction, and milling and backing. Otherwise, it is easy to produce a series of chain quality accidents. Therefore, it is crucial to ensure the quality of the glue binding to strengthen the quality check before glueing.

1. With the bookbinding process, it is necessary to re-impose the original film version without milled back allowance to ensure that the layout printing position meets the process requirements. Therefore, before printing, you should spend more time and effort on adjusting the layout of each piece of film, so that the book milling can achieve the technical requirements.

2. The quality of the folded pages should be avoided, so as to avoid the quality problems such as loose pages and continuation pages after the books are collated due to the deflection of the folding sheets. As we all know, the glue-binding process must cut and paste the book into a single page so that the glue can penetrate into it and make the book block not fall. However, the size of book-backed milling is limited by the size of the paper, layout, etc., and there is a certain limit. Therefore, the book pages and book stickers must meet the binding process requirements.

13% off and more than 30% off the book stickers, should be excluded from the air, its purpose is to eliminate the wrinkles.

â‘¡ basis weight 59g / m 2 and 59g / m 2 or less folded paper up to 4 fold, is set at 60 ~ 80g / m 2 sheet folded up to 3 fold. 2 or more paper 60g / m if a folding 4 fold, will result in increasing the amount of milling back, sometimes 4mm milling back to a single page can not be milled into the innermost page. This phenomenon has occurred in our factory, 80g/ m 2 . The paper uses a 4-fold folding sheet. The result is a conventional method of milling the backpack seal. It is found that there is less milling than the innermost single page. Later, the milling back amount is deepened. Although all of them have been thoroughly machined, after the finished product is cut, a shrinking page is found. Problems with pages, pages, etc.

3 The required folding page number is accurate. During the operation, each folding will be folded off to avoid any hidden troubles in subsequent processing. If deviations occur in the folds, rework should be carried out in time.

4 The book is flat and neat, with no obvious character folds, dead folds, folded corners, scraps, cover slips, and dirty marks. This is the basic appearance requirement of the fold. To make the book flat, you must tie and flatten the folded book before affixing it. The thicker the paper, the longer it takes to flatten it. At the same time, during the folding process, it is necessary to make a diligent inspection and pick out the signatures with prominent characters, folds, folds, scraps and stains to prevent them from being mixed into the finished product.

Second, the bookbinding process

1. Exploring the quality problems caused by hot melt adhesives. Hot melt adhesives act as glues for glue binding, and play a dual role of linking book pages and book block sheets and covers. The performance of the hot melt adhesive, and whether it is used correctly is the key to the quality of the glue binding product. The quality problems caused by hot melt adhesives are mainly manifested in the following aspects.

1 Hot-melt adhesive manufacturers, especially some small-scale enterprises, cannot provide users with complete technical support, resulting in a lack of adequate understanding of the properties of the plastic during the use of the user and the inability to properly select the use, resulting in improper selection of hot-melt adhesive models. The quality problems of models (mainly speed) and book paper mismatch. Also, the temperature of the hot melt adhesive is not properly controlled, which affects the fluidity, permeability, and wettability of the adhesive and reduces the adhesive force of the adhesive to the paper.

2 lack of appropriate hot melt adhesive performance testing methods, selection and evaluation of hot melt adhesive based on experience, when replacing the hot melt adhesive brand, there is an unstable factor during the trial, even if the same brand of hot melt adhesive, if the batch Instability, there are also quality problems.

3 The quality problem occurs when the hot melt adhesive is used improperly. During the period when the perfect binder is not working for a long time, the preheating pan and the working pan should be closed to prevent the colloid from melting and aging. It is necessary to regularly clean the preheated glue pan and the working glue pan to ensure the cleanness of the glue pan, prevent the precipitation of impurities in the glue liquid and influence the accuracy of the glue temperature control, and even cause the thermostat to malfunction, resulting in the phenomenon of colloidal combustion. Generally, under normal production and operation conditions, the preheated glue pan should be cleaned once every 3 months, and the working glue pan should be cleaned once every half month to prevent gum aging and failure to affect the bond strength of glue binding, and to better ensure that the glue Book quality.