Books and the addition of cutting in the actual operation of the analysis of two points

Three-sided knife cutting machine

The three-sided knife cutting machine is mainly used for the batch cutting of book and book products. Due to the production process, raw material problems or improper use of equipment, etc., it will have a certain impact on product quality.

1. Finished product specification error
Due to the cutting machine's machining accuracy, there will be a certain degree of error such as size and skew dimensions. The allowable error value is generally ≤ 1.5mm for finished product size, and skew should be controlled within ≤ 2mm. For special requirements, the product shall be constructed according to the contract.

If the specification is unstable, check whether the small brake iron clip is too loose or if the car shakes; whether the cam roller is damaged or the cam is worn out: whether the tool mounting position is tightened or not;

2. Appearance requirements
The finished book requires no serious knife, no pages, no serious breaks, burrs, dirty (flowers), embossing, back wrinkles, etc. To solve these problems, it is required to sharpen the knife edge, break the mouth, and replace it with knife and flower applications. The new knife; the knife bar should be flat, with the bottom knife after the knife with the appropriate; book guide rails to keep smooth and smooth, not covered with film, coating the cover, the top and bottom of each batch of fur books to pad.

3. Attention check
When cutting a finished book, besides paying attention to the cutting of the size, it is also necessary to check whether the graphic content of the product is cut. In the first batch and batch production, the spot inspection is very important. The defects mainly caused by errors in the layout design or in the printing and the postpress printing plus the following processes are:

1 Text content is too close to the finished edge of the finished product.

If there are errors or skews in the 2 folds, the graphic and text may be accidentally cut off, resulting in the loss of content, which can be cut as much as the quality standards allow.

3 For products with insufficient size for folding, the cutting pages are easy to appear and should be cut to the minimum size allowed to ensure the integrity of the content and non-pages.

4 Back wrinkles are mainly caused by the empty back of the backing of the package and the large voids.

4. Finished book book page breaks
The temperature of the workshop environment is too high or the air is too dry, it is easy to cause the book block paper to become brittle. The paper contains a certain amount of water at room temperature of about 8% to 10%, the climate is dry, the paper moisture content drops below 3%, the paper Crisp and easy to break, the cutting of the book at the cutting mouth is a common phenomenon.

Some brands of 60 ~ 80g light paper and offset paper due to its own manufacturing process, long-term storage in the above environment for a long time, when cutting the finished product, the book page will be from the end of the meeting (especially close to the opening of the mouth, ground The foot) burst, seriously affecting the quality of the product. For this reason, this problem can be solved by changing the moisture content of the paper. The specific methods are as follows:

1 Place the products to be cut in the baking room, keep the humidity on the ground, raise the temperature to 30-35°C, and the relative temperature reach 65%-70%. After 2 hours, the temperature was set at 28 to 30°C, the relative humidity was 80% to 85%, and it was left for another 12 hours. Paper moisture content of about 9% to 10%, and then cut the product, can solve the problem of paper breakage. Be careful not to over humidify, causing the book pages to absorb excessive moisture and forming wavy flounces.

2 Properly watering the floor of the workshop to increase the humidity of the environment can also solve the phenomenon of page breakage at the cutting office.

3Prints, signatures, and books that are to be printed after printing are not prone to prolonged exposure to sunlight or high temperature baking.

5. Finished Spine Creased and Broken
This phenomenon generally appears in the products of wireless glue-binding, flat-packed plastic bags, and lock-wire plastic bags. There are more products in printed books and double-cut products, and the main reason is that The pressure is not true, the paper is loose, and the book is pretty empty or empty. To solve the problem of the previous process and to solve it in the cutting process, you must:

1 Ensure that the knife edge is sharp and the angle is generally 22°, which can reduce the resistance formed on the book block when the knife is cut.

2 Check the pressure on the book foot. The working pressure should not be too heavy so as not to crush the spine.

3 When pressing the pad surface, the blanket is glued on the surface of the tablet with an adhesive. The pressure Plate should be 2~3mm smaller than the size of the finished book. The purpose is to compress the pressure when positioning the book. . The function of dispersing the trimming edge and pressing the leveling book block can reduce the degree of spine crumpling and ensure that the trimming edge is not broken.

A 48mm-thick double joint can be used on a three-sided knife cutting machine to use a double-profiler to trim, and a 6- to 10-mm incision should be reserved between process designs for a double-finished product. Too small to cut; too large paper size is not big enough.

5 change to use faster curing hot melt to pack the book or book package and then stand for 4 to 6 hours before cutting the finished product.

6 Reduce the number of scribbles per hand at the time of cutting, thereby reducing the work pressure on the book block during cutting, and improving the cutting of the ridges and broken ends of the finished book.

7 When the paper with relatively crumpling quality is used as the wrapping material, if it is no longer coated or covered, it can also be solved by the above method of artificially humidifying. 8 books, the book back is too square, angular, easy to break when cutting, but the quality standards of books and magazines are not allowed round back, the book can be sealed back.

Linkage production line cutting

Fine and flat-packed linkage production lines, saddle-stitching linkage production lines and other self-provided cutting organizations are basically single (double) cutting, and the adjustment requirements for cutting are not high. Refer to the above-mentioned related requirements. The main adjustments are as follows: several aspects.

1. Adjust the stability and certainty of the conveying position of the book (mostly relying on belts and conveyor belts).

2. The rational and synchronous adjustment of the book and the positioner is a very important task, which can prevent skewed, slanted mouth and shrinkage of the book after the book is finished.

3. Because of the belt and conveyor belt drive, pay attention to observing whether the front and back sides of the book are scratched or pulled (injured). Pay attention to adjustment at any time.

Source: Printed Today