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Book binding process technology operation IV

IV. milling and washing, slotting after the book block is pasted

milling back and slotting are the key processes of binding. Milling the back is to mill the book block with the back pasted into a flat single page along the whole carbon fiber and its composite investment and financing introduction part of the stapling part. The back cannot be milled into an inclined plane. The slotting is to mill the milled back of the book block into undulating grooves with a special tool at a certain distance and depth, so as to increase the permeability and contact area of the hot melt adhesive to the book block, so that the pages can be closely bonded. The milling depth should be determined according to the thickness of the paper and the number of folding layers of the book stickers. Taking 5 East Light Company as an example, nearly 100 people were dispatched to 2 grams of 60 grams of paper. Generally, the milling depth of the three split book block is 1.52mm or higher, and the four folded book block is 23mm under 90% relative humidity. The broaching depth is generally controlled between 0.8-1.5mm. If the paper is thick and fibrous, it can be pulled deeper, otherwise it can be pulled shallower. The deepest shall not exceed 1.5mm, and the shallowest shall not be less than 0.8mm. The shape of the pull groove is Λ type, and the angle is about 60 °. The distance between two adjacent pull grooves. Generally, the correct application method of the fixture of the electronic tensile testing machine should be 35mm, and the distance between the grooves can also be adjusted appropriately according to the situation of the paper. Generally, the 64 folio book block can pull 46 grooves, the 32 folio book block can pull 68 grooves, the 16 folio book block can pull 810 grooves, and the 8 folio book block can pull 1012 grooves, If the depth of milling back and broaching cannot meet the requirements, it will affect the penetration of glue liquid, resulting in the quality defects of page falling and scattering. While checking whether the depth of milling back and broaching is appropriate, it is also necessary to check the processing quality of semi-finished products before binding, such as page matching, binding, compaction and so on, as well as the glue application

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