Standard requirements for material size specifications of each part of the hardcover case
â‘ Specification of book case cardboard
The length of the bookcase cardboard: the length of the book block plus two floating mouth widths (floating mouth width: 3 ± 0.5mm for format 32 and below, 3.5 ± 0.5mm for format 16 and 4 ± 0.5mm for format 8 and above). Bookcase cardboard width: book block width minus 3-11mm.
â‘¡Medium-diameter cardboard specificationsMedium-diameter cardboard length: book block length plus two floats wide. Middle-diameter cardboard width: book back arc length (round back) or book back width plus two cardboard thickness and 1mm glue layer (square back false ridge).
③ Cover specifications The whole length: the length of the cardboard plus the width of the two edges (each edge width is 15 ± 1mm). Overall width: two cardboard widths plus one middle-diameter paper width and two middle slit widths, plus two wrapping widths. Mid-seam width: round back is groove width (6-7mm) plus one cardboard thickness, square back false ridge, groove width (6-7 mm) plus two cardboard thicknesses. Middle diameter width: middle diameter cardboard width plus two middle slit widths.
â‘£ Cover paper specifications
(1) The length of the paper in the cover: the length of the cardboard plus two cardboard thicknesses minus the width of the two wrapping edges. Inside paper width: cardboard width plus one cardboard thickness and minus one wrapping width.
(2) When cutting hard-covered bookcase cardboard and medium-diameter cardboard, you must cut inside and not outside.
(3) The size of the cut cardboard is accurate and not skewed, with a tolerance of ± 1mm.
(4) The correct adhesive is used (use animal glue or polyvinyl alcohol PVA), the viscosity is appropriate, and the application is thin and even, without overflowing.
(5) The group shells are not skewed correctly, and the upper and lower sides are consistent in parallel, with a tolerance of ± 1mm. The tolerance of the middle diameter is ± 1mm, and the width of the bookcase is ± 2mm.
(6) When cladding (manually), wrap the head and feet first, and then wrap the two sides, and wrap tightly, without empty sleeves, wrinkles, or bubbles.
(7) The back of the cladding is stacked on the opposite side. After flattening, it is naturally dried. Drying and exposure are strictly prohibited.
Hot stamping quality standard requirements
(1) It is correct to use hot stamping (zinc plate can be used under 6000 copies, and copper plate can be used for more than 6000 copies); hot stamping should be modified when the upper plate is printed, and the back plate should be polished before sticking to the plate to ensure that the sticking plate is firm and free of slippage. phenomenon.
(2) The temperature and time of hot stamping are correctly selected according to the hot substance.
(3) Appropriate pressure, no paste version, no flower version, clear graphics, sharp edges and gloss.
(4) The hot stamping specifications are accurate, the upper and lower tolerances of the middle waist graphic are not more than 2mm; the left and right tolerances are: 1 / 10mm for the thickness of the book block below 25mm, and 2.5mm for the above 25mm; cover specifications: skew and error not more than 1.5mm .
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