Double gray cardboard in the printing process pay attention to the point: double gray cardboard is a kind of environmentally friendly packaging materials, is a kind of regeneration of waste paper production. Double gray cardboard in the printing process has the following points are need to be aware of, such as the adjustment of the offset printing paper feed part, offset press, double control and zhang paper teeth pad and embossing roller surface distance. Double gray cardboard printing in the printing, will lose part of the paper suction nozzle and blowing paper air volume should be the corresponding large mouth, for the suction nozzle of paper, paper suction nozzle need to replace the larger diameter or the larger the thickness of the rubber aprons. By dismantling the feed roller CAM shaft with coupling between pin or dismantle the roller on the swings, thus to achieve the purpose of roll don't swing, smooth paper feed. In pair of gray paper printing, offset printing machine of double pieces of control or gap will increase, the side gauge and pressure gauge before the distance between the tongue and lose the cardboard paper to the corresponding some increase, paper teeth pad and embossing roller surface and lose the cardboard and paper teeth pad slightly with the increase of the distance between some, and keep a certain distance. Three, gray paper regeneration method of raw materials: generally speaking, after the use of packaging and printing waste cardboard, most are sold directly to recycling, and then after a collection processing, is sold directly to the board factory, and then after a series of processing, will board in processing production, producing gray paper meet the need. In addition to this method, and is worn by the board after the processing of renovation, in reprocessed into can use gray paper, in the past, are generally USES the suture cardboard, whole process, and then in the pattern of the printing house need again. Moreover is the small cardboard, plastic processing. The two methods can be modified gray paper roughness can not meet the requirements, procedure, the waste big shortcoming. As far as possible in order to save time, give full play to its advantages, the old gray paper has carried on the technological improvement, shabby gray paper first carries on the simple processing, remove old cardboard needle nails clean, put the sheet into a single, put the same cardboard paper paste into layers or single layer, finally will press pressure will separate after tissue paper flat, guarantee the adhesion formation, and then make it useful gray paper can. Four, the appearance of the cardboard quality how to identify: usually, paper and cardboard is a fiber material and auxiliary material, through the various working procedures, and if one of the fiber materials, auxiliary materials, process flow, equipment status, and so on all can cause disease of appearance, which affect the appearance of quality. The judgment can be determine by paper and cardboard. The appearance quality of paper and board will not only affect the physical performance index of paper or paperboard, but will also affect the use of products, and even decide the wastage of the products. Such as evenness, evenness bad would seriously affect the printing ink printing, may cause in the offset printing deformation due to moisture absorption, make the printing color is not accurate, serious word will become a waste.
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