In order to implement the “re-improvement†requirements of the “3·15†quality inspection activities in 2017, and to solve the problem of long-term impact on the quality of book printing, the General Administration of Quality Supervision and Inspection Center organized relevant experts to analyze and revise the solution. Please refer to the relevant departments, publishing units and printing companies for reference.
First, the effect and problem of "one improvement" in 2016
In 2016, the “3·15†quality inspection activities first proposed the “one improvement†requirement for solving the problem of open-laid loose-leaf pages, and formulated a solution to comprehensively analyze the causes of the problem of open-laid loose-leaf pages. Related requirements. During the event, local management departments, publishing units, and printing companies attached great importance to the issue of promoting the opening of plastic sheets. The results of the spot check showed that the problem of “opening the glue spread†in the non-conforming product dropped sharply, which was about 48 percentage points lower than that of the previous year. The problem of “opening the rubber spread†was effectively controlled. However, the phenomenon of side glue opening, gum breakage, gelatin root, falling pages, empty back, adhesive backing and so on are still outstanding, and it is necessary to raise awareness, attract attention, and focus on solving.
Second, the four problems solved in 2017
(1) Side glue opening problem
The glue-bonding side glue opening glue refers to the phenomenon that the cover and the book core sticking to the adhesive mouth are not firmly adhered. The performance is as follows: the front side or the back side side glues open the glue, and the front side front side glues open the glue or partially opens the glue (see Fig. 1). In severe cases, the cover is separated from the book block and affects the reader's use (see Figure 2).
Reason one: a small number of books have a side glue opening phenomenon. First, there are too many downtimes during the operation of the equipment. The cover is not bonded and shaped during the opening time of the glue. Second, the thickness of the batch book is inconsistent, and the thin side glue is in poor contact.
Solution:
(1) Minimize the number of downtimes during normal operation of the equipment;
(2) When the shutdown exceeds the opening time of the glue, 6-8 copies (3-5 pieces of stand-alone machine) should be eliminated;
(3) The rejected book can be reheated and flattened into a good product by hot pressing, without throwing off the cover and throwing it away;
(4) After the folding, the paper should be bundled to reduce the air in the signature to ensure that the thickness of the batch book is basically the same.
Reason 2: There is a phenomenon of side glue opening in the batch book. First, the gap between the rubber wheels on both sides is improperly adjusted, and the contact with the book block is bad; the second is that the side rubber type is improperly selected; the third is that the side rubber temperature is not set according to the technical parameters. The fourth is that the clamping distance is too large when the clamp is clamped.
Solution:
(1) According to the different paper quality, the type and type of adhesive should be selected correctly;
(2) Correctly adjust the spacing of the side rubber wheels according to the actual thickness of the book block to ensure uniform, stable and proper amount of glue;
(3) The temperature of the glue must be determined according to the technical parameters specified by the type and model used. The tolerance is ±5 °C, and the special case is ±10 °C. The data cannot be changed arbitrarily;
(4) Correctly adjust the distance of the clamping block, which is subject to the actual thickness of the book, and should not be too large or too small.
(2) Wireless Adhesive Staples Back Glue Breaking or Dew Root Problem
Some books have broken gums when they are flipped, and the pages of the breaks are not firmly bonded, which affects the reader's reading (see Figure 3); some books are opened on the first or last page of the book cover when the cover is opened. The glue is exposed at the beginning (see Figure 4).
Reason one: the book folder is not parallel or skewed, the milling back groove is not uniform, and the glue cannot be filled.
Solution:
(1) Correctly adjust the verticality and clamping degree of the book to ensure that the back of the book is in parallel contact with the rubberizing wheel;
(2) Correctly adjust the height of the three sets of rubber wheels of the rubberizing wheel, the rubberizing wheel and the rubberizing wheel.
Cause two: The milling cutter device is not parallel.
Solution:
Check the parallelism of the rotation of the milling cutter and the stability of the cutter in time, and find problems in time to repair or replace.
Reason 3: The type and type of adhesive used are not good or the quality of the adhesive is not good.
Solution:
(1) According to different paper quality, select the appropriate standard and type of adhesive;
(2) Check the technical parameters of the adhesive according to the standard;
(3) Do not misuse and mix adhesive materials.
Reason 4: Adhesive aging deterioration or improper adjustment of glue temperature.
Solution:
(1) Clean the rubber pot on time, the amount of glue should be reasonable, and the glue should not be repeatedly melted for a long time;
(2) The temperature of the glue is based on the technical parameters of the adhesive used, the tolerance is ±5 °C, the special case is ±10 °C, and it is not allowed to increase or decrease at will;
(3) Different types of adhesives should not be mixed.
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