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1, paper stretching Usually Print Factory, paper is paper and subject to the direction of fiber axis and the drum set as the benchmark. All printing paper, the fiber orientation and the roller axis parallel to the longitudinal silk thread paper is called, and fiber orientation and the roller axis perpendicular to the paper, called the horizontal paper thread paper. In Offset printing Longitudinal and subject should be used for printing paper. This is because: from the feeding point of view, vertical and subject to the paper in the coming and going (axial) direction compared Ting Ying, difficult to tear along the radial port, blown loose and easy to transport, from the overlay in terms of a dry fiber, completely wet, its diameter may be increased by 30%, while the length of the 1-2% increase. Therefore, Wang and subject to the paper than the paper and subject to come and go vertical (axial) elongation of more direct impact on overlay accuracy. The vertical up and down and subject to the paper (radial) stretch more, but by adjusting the ladle or other means to make accurate registering. [Case] Single-color offset printing a factory with a group of three open four-color live pieces of paper used for the sheet offset paper, cutting method, compared with T-shaped cutting method. When the first color print finished, the second color overlay and found there was no law on both sides of the overlay are not allowed. [Case Study]: This phenomenon often occurs, offset press operator mistakenly think this is a poor quality paper, the actual reason is that the cutting process using a T-shaped method, while the horizontal and vertical wire thread silk thread mixed paper, which to stretch the paper is inconsistent, therefore, which leads to closed and no regularity about overprint. [Expert Tips]: Where to cut a single sheet of paper clip warning section, printing to vertical, horizontal and subject to a separate paper, can not be mixed. Paper is a variability of material, composed of paper fibers with moisture absorption effect, the air contains a certain amount of water, so as long as the paper in contact with air, it has continued to occur with air humidity balance. When the ambient humidity in the air above the paper contained in the humidity, the paper will absorb moisture from the air and the expansion of elongation, whereas the surrounding environment when the air humidity is lower than the humidity contained in the paper itself, the paper will be released out moisture and shrink shorter, in order to achieve a balance with the ambient humidity, the so-called paper of the tight side, Heye Bian are with the water content of the paper. In order to prevent expansion due to the image overlay paper are not allowed to, the printing industry to make full use of vertical and subject to the paper (in the Papermaking Paper factory known as the transverse and subject to) control of water the size of the page. If the paper is not good, overprint higher, and the use of single-color offset multi-color printing is possible, first, clean water pressure again. I am an expert from customizedusbflashdrive.com, while we provides the quality product, such as PVC USB Flash Drive , Metal USB Memory, Leather USB Flash Disk,and more.
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