I. Quality Control Position Settings In order to control the quality of books and periodicals, Tsinghua University Press has two positions to manage them: the printer and the quality inspector.
The responsibilities of the printer include the quality inspection of the new book sample books sent from the binding factory, pointing out various problems in printing, such as uneven ink, spilled glue, and excessive page number errors. Solving the above problems before bulk binding can effectively ensure the smooth progress of the follow-up work.
The quality inspector's job is to carry out a random inspection of the finished books that have been put into storage to reflect the quality qualification rate of the batch factory, and to check the quality of the products before and after the books and magazines are put into storage by the printer and the quality inspector, thus avoiding books and periodicals with quality problems. Inflow to the market.
Second, the actual problems affecting quality Although the quality of the work of the publishing house is very effective, due to various reasons, there are still some problems:
1) There are many kinds of books and periodicals, including polytechnics, humanities, arts, and medicine, and different editorial offices have different requirements for books and periodicals. 4 quality inspectors must complete the quality inspection of more than 3,000 kinds of books each year. The tasks are arduous and mistakes are inevitable.
2) The editorial department has calculated independently, in order to reduce costs, it often appears that the film is not standardized, the quality of the paper is not up to standard, the editors require a short publication cycle, and the manuscript is printed and bound without being completely “QI, DAI, Dingâ€, which may easily result in Rework school reform, extend the publishing cycle, affect the quality of printing. In particular, the shortening of the publishing cycle of hardcover books has resulted in unstable quality, the appearance of ink penetrating, and the problem that the book case is easy to warp.
3) Some printing manufacturers have outdated equipment, low management standards, and frequent turnover of binding staff, which is extremely prone to technical problems, especially during the publication of spring textbooks.
Third, the quality of books and periodicals and their solutions At present, the quality issues of books and periodicals of Tsinghua University Press are generally expressed in the following aspects:
1 Finished product appearance 1) Book cover back error and cover dead spine Design cover book is different from a single book, requiring uniform rules and dimensions in both wrapping and cutting. If the set of books is divided into books and cuts, it is easy to cause changes in specifications, resulting in errors, resulting in the book back words jumping up and down. Some books design the cover as a dead spine. The design thickness of the spine does not match the actual thickness of the bound book. The book back pattern is significantly smaller or larger than the thickness of the back of the book, so the center of the back cover of the book can only be glued to the book block. Because the weight of the paper is allowed to have an error, a book should be made first, the back thickness of the book should be determined, and then the cover size should be obtained.
2) Foaming and wrinkling of the cover film Generally, blistering and wrinkling are rare just after the film is covered. The main reason for this problem is that the device status is not adjusted properly, the operating temperature is not suitable, or Excessive dusting. After the coating is completed for a period of time, such problems are prone to occur. This is mainly because the ink on the cover after printing is not completely dry, and some of the non-volatile ink solvents affect the adhesive properties of the adhesive, and thus wrinkles and creases occur. bubble. Therefore, after the cover is printed, especially in the overprint area where the image is darkened and the amount of ink is large, there must be enough ink conjunctiva and sufficient drying time. The amount of dusting cannot be too large, otherwise it is difficult to guarantee the quality.
2 Graphic Printing 1) Text Ink Color Differences Ink unevenness is caused by unstable press pressure or ink imbalance. The printing plant may print several sheets on one machine. Due to the different subjective standards of the masters of the workers, the pressure adjustment of the printing machines is inconsistent, and the water supply and ink supply are different. This is the main reason for the quality problems of monochrome printing products. (To be continued)
The responsibilities of the printer include the quality inspection of the new book sample books sent from the binding factory, pointing out various problems in printing, such as uneven ink, spilled glue, and excessive page number errors. Solving the above problems before bulk binding can effectively ensure the smooth progress of the follow-up work.
The quality inspector's job is to carry out a random inspection of the finished books that have been put into storage to reflect the quality qualification rate of the batch factory, and to check the quality of the products before and after the books and magazines are put into storage by the printer and the quality inspector, thus avoiding books and periodicals with quality problems. Inflow to the market.
Second, the actual problems affecting quality Although the quality of the work of the publishing house is very effective, due to various reasons, there are still some problems:
1) There are many kinds of books and periodicals, including polytechnics, humanities, arts, and medicine, and different editorial offices have different requirements for books and periodicals. 4 quality inspectors must complete the quality inspection of more than 3,000 kinds of books each year. The tasks are arduous and mistakes are inevitable.
2) The editorial department has calculated independently, in order to reduce costs, it often appears that the film is not standardized, the quality of the paper is not up to standard, the editors require a short publication cycle, and the manuscript is printed and bound without being completely “QI, DAI, Dingâ€, which may easily result in Rework school reform, extend the publishing cycle, affect the quality of printing. In particular, the shortening of the publishing cycle of hardcover books has resulted in unstable quality, the appearance of ink penetrating, and the problem that the book case is easy to warp.
3) Some printing manufacturers have outdated equipment, low management standards, and frequent turnover of binding staff, which is extremely prone to technical problems, especially during the publication of spring textbooks.
Third, the quality of books and periodicals and their solutions At present, the quality issues of books and periodicals of Tsinghua University Press are generally expressed in the following aspects:
1 Finished product appearance 1) Book cover back error and cover dead spine Design cover book is different from a single book, requiring uniform rules and dimensions in both wrapping and cutting. If the set of books is divided into books and cuts, it is easy to cause changes in specifications, resulting in errors, resulting in the book back words jumping up and down. Some books design the cover as a dead spine. The design thickness of the spine does not match the actual thickness of the bound book. The book back pattern is significantly smaller or larger than the thickness of the back of the book, so the center of the back cover of the book can only be glued to the book block. Because the weight of the paper is allowed to have an error, a book should be made first, the back thickness of the book should be determined, and then the cover size should be obtained.
2) Foaming and wrinkling of the cover film Generally, blistering and wrinkling are rare just after the film is covered. The main reason for this problem is that the device status is not adjusted properly, the operating temperature is not suitable, or Excessive dusting. After the coating is completed for a period of time, such problems are prone to occur. This is mainly because the ink on the cover after printing is not completely dry, and some of the non-volatile ink solvents affect the adhesive properties of the adhesive, and thus wrinkles and creases occur. bubble. Therefore, after the cover is printed, especially in the overprint area where the image is darkened and the amount of ink is large, there must be enough ink conjunctiva and sufficient drying time. The amount of dusting cannot be too large, otherwise it is difficult to guarantee the quality.
2 Graphic Printing 1) Text Ink Color Differences Ink unevenness is caused by unstable press pressure or ink imbalance. The printing plant may print several sheets on one machine. Due to the different subjective standards of the masters of the workers, the pressure adjustment of the printing machines is inconsistent, and the water supply and ink supply are different. This is the main reason for the quality problems of monochrome printing products. (To be continued)
Most climbers ignore some of the key points in the equipment, and pay attention to them, because in the wild, equipment represents life, equipment is not good or not enough, and it will kill people in extreme circumstances. First of all, the field is to solve the problem of water, must bring water Bottles . Many veteran field explorers carry a knife, which is the most important tool in the wild.We variety of products suitable for mountaineering,Mountaineering buckle, mountaineering bag etc
Mountaineering Products
Climbing Gear,Rock Climbing Gear,Climbing Shoes,Climbing Equipment
Ningbo Aijiecheng Industry Co.,LTD. ,