The gluing position of the paper bag machine is on the spine and the side, and the hot melt adhesive used is also different. For example, the performance of the two is also different, and the hot melt temperature is different. It is necessary to grasp the proper quality of gluing and gluing Important, if the temperature of the melt is too high, the melt will be too thin and the viscosity will be insufficient. If the temperature of the melt is too high, the glue will be too thick to penetrate and flow, and some will appear as small granular blocks attached to the ridge or side. The cover will be wrinkled and hollow on the surface. It is worth mentioning that at present, the performance of hot melt produced by different manufacturers is not the same (we have this experience from actual use). Take the hot melt temperature of the hot melt adhesive used in our factory as an example, there are The side glue temperature is 120℃, the spine glue hot melt temperature is 135℃, and some side glue hot melt temperature is 180℃, and the spine glue heat is 200℃. Therefore, it is necessary to master the appropriate process parameters according to the properties of the material in use to ensure the quality of the glue. Normally, after gluing, the width of the side glue covering is 4mm~5mm. The spine glue can penetrate and fill the milling groove. If the glue is uneven, the glue is too thin, and the pallet of the cover paper bag machine is not replaced as required (or the height is adjusted appropriately), the book after the plastic bag is prone to empty ridges and wrinkled backs. This is something that must be controlled and inspected during the plastic packaging process.
The finishing work before the glue bag of the paper bag machine is a process that cannot be ignored in the whole process of wireless glue binding. If the paper bag machine enters the plastic bag after the finishing process is not completed, then the plastic bag will have many kinds of poor quality problems such as peeling, loose pages, empty ridges, and wrinkled ridges. Sorting is to bundle the semi-finished book stickers, put a certain number of book stickers on the strapping machine, fasten the two ends with plates, start the strapping machine, compact the loose book stickers and then tie them with rope. In order to make the back stiff and firm after compaction, after compacting and binding, paint the back of the book with polyethylene glue once again. After the applied polyvinyl alcohol glue dries, loosen the rope, and then Separate each book into a plastic bag.

In perfect binding, milling and finishing is a key process. The milling back should be determined according to the thickness of the paper sheet and the number of folded layers. Generally, it should be milled away from 1.4mm to 3mm, and the roughening depth is required to be 0.8mm to 1.5mm. If the depth of milling and roughing is not enough, it will inevitably affect the penetration of the glue, resulting in quality defects of peeling and loose pages. In the paper bag machine, in the finishing process before the plastic bag, if the book stickers are not smashed, bundled unevenly, and not compacted, they are transferred to the milling back. Then the semi-finished product with this quality defect must be the book back after being clamped by the book clip in the plastic bag machine. Unevenness, the milling cutter cannot mill, and the book back roughening depth is not enough. The above-mentioned quality defects of glue impermeability, peeling, and loose pages must exist. Therefore, if peeling and loose pages are found in the quality inspection after the plastic bag, while checking whether the milling and roughing depth is appropriate, check the semi-finished product processing of the collating, binding, and compacting processes of the plastic bag. Quality situation.