Wireless binding does not use wires or wires, but glues book blocks with glue, from book-booking to automatic finishing. The technological process is roughly as follows: paging into the milling back, brushing the upper side, glue the book back, plastic bag cover, molding glue, cooling, double slitting, cutting the finished product, stacking the light, inspecting the finished product, and bundling.
The sorting work after the book is collated before entering the plastic bag is a process that cannot be ignored in the entire process of wireless binding. If the book after collating fails to get into the plastic bag in the finishing process, then there will be many bad quality problems such as loose pages, loose pages, empty ridges and wrinkled ridges after the plastic bag. Finishing is to bundle the semi-finished book stickers, put a certain number of book stickers on the strapping machine, the two ends are fastened by plates, start the strapping machine, compact the loose book stickers and then tie them with rope straps. In order to stiffen the spine after the compaction, after the compaction and bundling, use the polyethylene glue to paint on the bound book back again. After the polyvinyl alcohol glue on the brush is dried, loosen the tie rope, and then Separate each book and transfer to plastic bag.
In wireless perfect binding, milling back and roughening are the key processes. The back milling should be based on the thickness of the paper sheet and the number of folded layers. Generally, it is necessary to mill 1.4 mm to 3 mm, and the depth of roughening is required to be 0.8 mm to 1.5 mm. If the depth of back milling and roughening is not enough, it will inevitably affect the penetration of the glue, thereby causing quality defects of peeling and loose pages. If in the finishing process before the plastic bag, the stickers are turned into the milling back without breaking, bundling, or compacting, then the semi-finished product of this quality defect is bound to be an uneven book back after being clamped by the book holder in the plastic bag machine. If the cutter can not be milled, the depth of the back of the book is not enough. The quality defects of glue impermeability, peeling and loose pages as mentioned above must exist. Therefore, if the peeling and loose pages are found in the quality inspection after the plastic bag, while checking whether the milling back and the roughening depth are appropriate, the semi-finished products processing of the collating, strapping, compaction and Other processes entering the plastic bag should also be checked. Quality situation.
The position of the glue binding is on the spine and the side. The hot melt adhesive used is also different. For example, the film model for the spine is H-970T, and the film model for the side is H-239T. The performance of the two is also different. The hot-melt temperature is different. It is important for the quality of gluing and binding to know whether it is appropriate. The high temperature of the melt will make the melt too thin and the viscosity is insufficient. The high temperature of the melt will make the glue too thick and It cannot penetrate and flow, and some will adhere to the ridge surface or side surface in the form of small granules, which will make the cover wrinkle and empty ridge. It is worth mentioning that at present, the performance of the hot sol produced by different manufacturers is not the same (we have such experience from actual use). Taking the hot melt temperature of the hot melt adhesive used in our factory as an example, there are The temperature of the side glue is 120 ° C, the hot melt temperature of the spine glue is 135 ° C, and some of the side glue has a hot melt temperature of 180 ° C and the heat of the spine glue is 200 ° C. Therefore, according to the performance of the material, proper process parameters must be mastered in order to ensure the quality of the glue. Normally, after glueing, the width of the side glue should be 4mm ~ 5mm. The spine glue can penetrate and fill the milling groove. When the glue is uneven, the glue is too thin, and the cover of the cover laminator is not replaced as required (or the height is adjusted appropriately), the books after the glue are prone to ridges and wrinkles. This is something that must be controlled and checked during the plastic bag process.
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