Product quality problems caused by the paper to quantitative analysis

In actual production, the product quality problems caused by paper quantitative abound, but mostly not because the paper itself quality is bad, but because of the printing process design is not reasonable.In this, longyin group will be summarized analysis from two aspects, and peer interaction.

A. The paper is quantitative not appropriate

The industry is generally believed that the same category of the higher the paper quantitatively, and the stiffness of the tightness is better, but what exactly what printing enterprise quantitative paper to print a product, is based on the factors to consider: one to consider the cost factor, 2 to take into account customer requirements and product use, third, we need to consider the paper printing and postpress eligibility, etc.

Ordinary wine, for example, mark printing (in multicolor printing last walk paper printing, and then directly cutting or punching die forming), in the customer without paper puts forward special requirements, to reduce the cost of printing enterprise may choose 80 g/m2 or less quantitative coated paper;But if the product including process after the stamping process, in order to ensure the stamping process of paper, paper smooth and hot stamping precision, printing enterprise may consider to choose 90 g/m2 or higher ration of coated paper.If customers have special requirements on the paper, such as requiring the wine label is suitable for the high speed filling machine (20000 bottles/or higher) attachment labeling, printing enterprise will be very careful when choosing paper quantitative, even small batch testing-run to client after commissioning, commissioning successfully rear can batch production.

So said, if the printing enterprise in the absence of quantitative paper printing comparison between the same case, general won't because the quantitative problem complaint paper suppliers, unless it is quantitative and the nominal value of the paper used, or paper quantitative instability.

It is important to note that for high-speed sheet-fed multi-color offset press, if the paper is a quantitative low (less than 38 g/m2), will be caused by poor stiffness poor paper, printing fault (including misregister, tearing glued to the rubber cloth fine), paper did not wait for a phenomenon.

2. Paper quantitative uniformity and stability

Compared with paper quantitative level, customers pay more attention to the paper quantitative uniformity and stability.Because quantitative uniformity and stability of paper, cause in the process of the die cutting pressure is difficult to control, leading to some al version of the product under the same pressure scattered inside the machine (the same ration is low, the thickness of thin paper or paper quantitative is low, the thickness of the thin parts), which leads to the phenomenon of cushion to break the mark line;Some version of the product are produce cutting edge pressure more opaque and paper product surface hair phenomenon.For high speed automatic packaging machine products (e.g. bag, etc.), whether pad broken mark line or phenomenon through cutting edge pressure, may cause the packing process go poor paper, packaging the traffic problems.

In addition, for cigarette package, label, medicine packages need to use weighing method to determine the number of finished products such as products, if the paper is the quantitative is not stable, will directly affect the accuracy of the product quantity.