Production method of PUR round-spine hardcover books

Abstract

The present invention relates to the field of hardcover book production, and particularly to a method for producing PUR round-back hardcover books, including: step S1, sewing the book block; step S2, gluing and cutting the book block; step S3, rounding the spine; step S4, covering the book block with a case; step S5, finished product inspection and screening; during the production process of round-back hardcover books, the present invention uses PUR glue instead of hot melt glue or cold glue used in the production of traditional round-back books. Compared with round-back hardcover books produced by traditional methods, PUR round-back hardcover books have the advantages of long service life, the ability to return to their original shape even after being flipped and squeezed, good shaping effect, and can be stored in extreme environments; the present invention accurately determines the spine rounding time according to the temperature and humidity in the environment, improving the quality of round-back hardcover book production.

Description

Technical Field

[0001] The present invention relates to the field of hardcover book production, and particularly to a method for producing a PUR round-back hardcover book. Background Art

[0002] For a round book spine, due to the slightly different positions of the front and back book signatures, the folding parts of the book signatures are slightly semi-circular and distributed on an arc surface, so that the thickness is balanced; the core and the turned-in edge adapt to the convex round shape of the spine and are concave; therefore, it is better to use a round spine for thicker books. A round-spine book has a round arc-shaped back spine after rounding processing. Generally, it is appropriate that the rotation angle of the core thickness is 120 degrees with respect to the arc; the round spine can be divided into two types: round back without ridge and round back with ridge.

[0003] Chinese Patent Publication No.: CN110271312A discloses a production process for hardcover books. Step A1: page processing; Step A2: page bonding; Step A3: spine production; Step A4: core forming; Step A3 includes the following steps: Step A31: wet the glued part of the pages; Step A32: rounding; Step A33: ridging; Step A34: drying. It can be seen that in the prior art, there are still the following problems. The traditional production of hardcover books uses water glue and EVA hot melt glue. Compared with PUR glue, the service life of water glue is relatively short, the setting is slow, it is easy to deform, and the requirements for the storage environment are high; the service life of ETA hot melt glue is short, it is easy to deform, easy to come off, and the requirements for the environment are relatively high. Summary of the Invention

[0004] Therefore, the present invention provides a method for producing a PUR round-back hardcover book to overcome the problems in the prior art that the storage time of hardcover books is short and the requirements for environmental conditions are high due to the use of water glue or EVA glue.

[0005] To achieve the above object, the present invention provides a method for producing a PUR round-back hardcover book, including,

[0006] Step S1, core sewing;

[0007] Step S2, gluing and cutting the core; Step S3, rounding the spine;

[0008] Step S4, core casing;

[0009] Step S5, finished product inspection and screening.

[0010] Further, after the core sewing is completed, the tightness of the core is detected. The sampling quantity is n signature pages for pulling. Each time a single signature page is pulled, and after the pulling of any signature page is completed, it is pushed back to its original position. The misalignment distance of each signature page is detected. The misalignment distance of the i-th signature page pulled is denoted as Li, i = 1, 2,... n; the maximum pulling standard distance Lz of Li is compared with the minimum pulling standard distance Lx,

[0011] When Lx ≤ Li ≤ Lz, it is determined that the displacement distance of the i-th pasted page is within a reasonable range;

[0012] When Li is not within the range of [Lx, Lz], it is determined that the displacement distance of the i-th pasted page is not within a reasonable range; when the displacement distances of all the pasted pages pulled are within the range of [Lx, Lz], it is determined that the core sewing process is qualified;

[0013] Lx = 0.3mm, Lz = 0.5mm.

[0014] Further, after determining that the core sewing process is qualified, the book core is placed into the PUR gluing system of the gluing machine to glue the book core through the glue pot. Among them, the type of glue used in the glue pot is PUR glue, and the model of the PUR is PUR - 1018; the gluing thickness of the book core is 0.5 - 0.7mm.

[0015] Further, during the process of gluing the book core in the step S2, crepe paper is adhered in the direction parallel to the spine. The weight of the crepe paper is 157 ± 1g, and the width is the spine width + 10mm; after the crepe paper is adhered, the book core is cut by a three - edge trimmer.

[0016] Further, during the process of gluing the book core in the step S2, the environmental temperature and humidity are maintained within a reasonable range. The environmental temperature range is 20 - 30°C, and the environmental humidity range is 25% - 30%.

[0017] Further, after the gluing and cutting of the book core in the step S2 are completed, the spine of the book core is rounded. The determination method of the rounding time is: pick up the glued book core to check the state of the glue bottom, and start rounding when the glue bottom shows wire drawing.

[0018] Further, during the step S3, before rounding the spine of the book core, a trial rounding is carried out to detect the appearance after the trial rounding.

[0019] When there are cracks on the book back and the shape is not round, it is determined that the trial rounding fails;

[0020] When there are no cracks on the book back and the shape is round, it is determined that the trial rounding is successful, and the formal rounding is carried out.

[0021] Further, after rounding the spine of the book core, in the step S4, the book core and the book cover are adhered with base glue for the case - covering operation. After completion, in the step S5, the finished products are screened to pick out the unqualified products.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows. During the process of sewing the signatures of the book core in step S1, by pulling the book sections to observe the displacement distance between two adjacent book sections, it is ensured that the sewing is neither too loose nor too tight. If the sewing is too loose, the book core is likely to become deformed; if the sewing is too tight, the book core is likely to break. In this way, the quality of sewing the book core is improved, and further the quality of subsequent gluing of the book core is ensured.

[0023] Further, during the process of gluing the book core in step S2, PUR glue is used instead of water glue and EVA hot melt glue. Compared with PUR glue, water glue has a relatively short service life, slow setting, is prone to deformation, and has high requirements for the storage environment, that is, it cannot adapt to high-temperature and high-humidity environments; EVA hot melt glue has a short service life, is prone to deformation, is prone to coming unstuck, and has relatively high requirements for the environment, especially for temperature. By using PUR glue to replace the water glue and EVA hot melt glue commonly used in the prior art, the quality of round-back hardcover books can be effectively improved, and the storage resistance of hardcover books can be enhanced.

[0024] Further, during the processes of gluing and rounding the book core, by reasonably adjusting the temperature and humidity of the environment, the gluing and rounding time of the book core can be accurately controlled. The drier the air and the higher the temperature, the longer the rounding time required. By accurately controlling the gluing and rounding time, the quality of gluing and rounding the book core is improved, the processing qualification rate of hardcover books is further increased, and the waste of processing materials is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flowchart of the method for manufacturing a PUR round-back hardcover book according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0028] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner"

[0029] "outer", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0030] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Please refer to Figure 1 as shown, which is the method flow chart of the PUR round-back hardcover book manufacturing method described in the embodiment of the present invention, including

[0032] Step S1, sewing the signatures of the book block;

[0033] Step S2, gluing and cutting the book block; Step S3, rounding the spine;

[0034] Step S4, covering the book block with a case;

[0035] Step S5, final inspection and screening of the finished product.

[0036] Furthermore, during the process of Step S1, when sewing the signatures of the book block, the tightness of the book block is maintained within a reasonable range. The determination method for the tightness of the book block is: when the sewing of each signature of the book is completed, the dislocation distance between the upper signature and the lower signature is pulled to be 0.3 - 0.5 mm, where mm represents millimeters.

[0037] Specifically, during the process of sewing the signatures of the book block in Step S1, by pulling the signatures to observe the dislocation distance between two signatures, it is ensured that the sewing is neither too loose nor too tight. If the sewing is too loose, the book block is prone to deformation; if the sewing is too tight, the book block is prone to breakage. In this way, the quality of sewing the signatures of the book block is improved; further, the quality of subsequent gluing of the book block is ensured.

[0038] Furthermore, after completing the sewing of the signatures of the book block in Step S1, the book block is put into the PUR gluing system of the gluing machine to glue the book block through the glue pot. The type of glue used in the glue pot is PUR glue, and the model of the PUR is PUR - 1018; the gluing thickness of the book block is 0.5 - 0.7 mm.

[0039] Specifically, during the process of gluing the book block in step S2, PUR glue is used instead of water-based glue and EVA hot melt glue. Compared with PUR glue, the service life of water-based glue is relatively short, the shaping is slow, it is easy to deform, and it has high requirements for the storage environment, that is, it cannot adapt to high-temperature and high-humidity environments; the service life of EVA hot melt glue is short, it is easy to deform, and it is easy to come unglued, and it has relatively high requirements for the environment, especially for temperature. By using PUR glue instead of water-based glue and EVA hot melt glue commonly used in the prior art, the quality of round-back hardcover books can be effectively improved, and the storage resistance of hardcover books can be enhanced.

[0040] Further, during the process of step S2, when gluing the book block, crepe paper is adhered in the direction parallel to the spine. The weight of the crepe paper is 157 ± 1 g, and the width is the spine width + 10 mm; after the crepe paper is pasted, the book block is cut by a three-sided knife, where g represents grams.

[0041] Further, during the process of gluing the book block in step S2, the ambient temperature and humidity are maintained within a reasonable range. The ambient temperature range is 20 - 30 °C, and the ambient humidity range is 25% - 30%.

[0042] Specifically, during the gluing and rounding of the book block, by reasonably adjusting the ambient temperature and humidity, the gluing and rounding time of the book block is accurately controlled. The drier the air and the higher the temperature, the longer the rounding time required. By accurately controlling the gluing and rounding time, the gluing and rounding quality of the book block is improved, the processing qualification rate of hardcover books is further increased, and the waste of processing materials is avoided.

[0043] Further, after the book block is glued and cut in step S2, during step S3, the spine of the book block is rounded. The determination method for the rounding time is: pick up the book block after gluing and check the state of the glue bottom. If the glue bottom shows wire drawing, it indicates that rounding can start.

[0044] Further, during step S3, before rounding the spine of the book block, a trial rounding is carried out to observe whether there are cracks on the book back and whether the shape is round; when there are cracks on the book back and the shape is not round, the rounding fails; when there are no cracks on the book back and the shape is round and confirmed to be correct, the rounding operation is completed within 0.5 h, where h represents hours.

[0045] Further, in the above step, during step S3, after the spine of the book block is rounded, in step S4, the book block and the book cover are adhesively joined with base glue for the casing-in operation, and in step S5, the finished products are screened to pick out unqualified products.

[0046] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a PUR round-ridged hardcover book, characterized in that, Including: Step S1, sewing the signatures of the book block; Step S2, gluing and trimming the book block; Step S3, rounding the spine; Step S4, casing the book block; Step S5, final inspection and screening of the finished product; After the signatures of the book block are sewn, the tightness of the book block is detected. The sampling quantity is n signatures for pulling. Each time, a single signature is pulled, and after the pulling of any signature is completed, it is pushed back to its original position. The dislocation distance of each signature is detected. The dislocation distance of the i-th signature pulled is denoted as Li, where i = 1, 2,... n; The maximum pulling standard distance Lz and the minimum pulling standard distance Lx of Li are compared. When Lx ≤ Li ≤ Lz, it is determined that the dislocation distance of the i-th signature is within a reasonable range; When Li is not within the range of [Lx, Lz], it is determined that the dislocation distance of the i-th signature is not within a reasonable range; When the dislocation distances of all the signatures pulled are within the range of [Lx, Lz], it is determined that the sewing process of the book block is qualified; Among them, Lx = 0.3mm and Lz = 0.5mm; After it is determined that the sewing process of the book block is qualified, the book block is placed into the gluing system of the binding machine to apply glue to the book block through a glue pot. Among them, the type of glue used in the glue pot is PUR glue; The glue application thickness of the book block is 0.5 - 0.7mm.

2. The method for manufacturing a PUR round-ridged hardcover book according to claim 1, wherein During the process of Step S2, when applying glue to the book block, crepe paper is adhered in the direction parallel to the spine. The weight of the crepe paper is 157 ± 1g, and the width is the spine width + 10mm; After the crepe paper is adhered, the book block is trimmed by a three-knife trimmer.

3. The manufacturing method of the PUR round-ridged hardcover book according to claim 2, wherein During the process of applying glue to the book block in Step S2, the ambient temperature and humidity are maintained within a reasonable range. The ambient temperature range is 20 - 30°C, and the ambient humidity range is 25% - 30%.

4. The manufacturing method of the PUR round-ridged hardcover book according to claim 3, characterized in that, After the gluing and trimming of the book block are completed in the process of Step S2, the spine of the book block is rounded. The determination method of the rounding time is: pick up the book block after gluing and check the state of the glue bottom. Start rounding when the glue bottom shows wire drawing.

5. The manufacturing method of the PUR round-ridged hardcover book according to claim 4, wherein, During the process of Step S3, a trial rounding is carried out on the spine of the book block before the formal rounding, and the appearance after the trial rounding is detected. When there are cracks on the book back and the shape is not round, it is determined that the trial rounding fails; When there are no cracks on the book back and the shape is round, it is determined that the trial rounding is successful, and the formal rounding is carried out.

6. The manufacturing method of PUR round-ridge hardcover books according to claim 5, characterized in that, After the rounding of the spine of the book block is completed, in the process of Step S4, the book block and the book cover are adhered with base glue for casing operation. After completion, in the process of Step S5, the finished products are screened to pick out the unqualified products.

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