Approved The First Batch Of 2 Standard Leather Matrix Samples In China

< p > according to the People's Republic of China national standard announcement (2013 No. twenty-fifth), the state "a href=" http://www.91se91.com/news/index_c.asp "> Quality Supervision < /a > inspection and quarantine administration and the National Standardization Management Committee approved the release of GSB16-3086-2013" standard samples of methyl esters of fumaric acid in leather "and GSB16-3087-2013" standard samples of lead, cadmium, nickel, chromium, cobalt, copper, antimony, arsenic and mercury in leather ". The first batch of 2 standard leather matrix samples of China were approved and issued, filling the blanks of leather matrix standard samples at home and abroad. The characteristics of the standard samples are: < /p > two.
< p > matrix consistency: in accordance with < a href= "http://www.91se91.com/news/index_c.asp" > leather industrialization < /a > production process, it is consistent with the daily detection of leather sample matrix. < /p >
< p > uniformity: characteristic elements distribute uniformly in standard samples. < /p >
< p > stability: under certain storage conditions, the characteristic elements are stable in < a href= "http://www.91se91.com/news/index_c.asp" > standard sample < /a >. < /p >
< p > traceability: the 10 CNAS accredited laboratories have Collaborative Value Determination and have traceability. < /p >
< < p > CNAS-CL10:2012 "Application Specification for accreditation criteria for testing and calibration laboratories in the field of chemical detection" requires that "certified standard samples and laboratory controlled samples should be consistent with the sample matrix as far as possible". The applicable scope of this standard sample is: < /p >
< p > daily testing: avoid the "matrix effect" of the actual leather samples, which will affect the accuracy of the instrument quantification. < /p >
< p > quality control sample: used for laboratory staff comparison, instrument comparison, method validation and other quality control activities. < /p >
< p > check samples: used to evaluate the ability of testing institutions and inspectors, expand new methods, and do not meet the needs of work rectification. < /p >
< p > related links: < /p >
< p > leather comes from animals, which determines the irregularity of leather. In addition, the price of leather is too high to waste, so it is decided that leather printing equipment can not copy the textile printing equipment. At present, the printing equipment in leather industry is divided into direct printing equipment, transfer printing equipment and some auxiliary equipment. < /p >
< p > A. direct printing equipment: the first choice, of course, is manual lifting. It has the advantages of fast changing pattern, wide adaptability and convenient color register. However, the biggest problem of hand lifting plates used for leather printing is the large amount of waste caused by irregularity of leather. The professional term is called paste edge, and the scissors are used to repair them. Therefore, manual lifting boards do not use much in leather printing. < /p >
< p > the most common type of leather printing is the roller printing machine. The special roller printing machine developed by South Korea has excellent printing effect. It can print any fine pattern, and the utilization rate of leather can be maximized without any waste. In addition, there are also plastic dropping machines and embossing machines. < /p >
< p > B. transfer printing equipment: transfer printing requires a printing machine and heat transfer printing machine. At present, film is used instead of paper in foreign countries, so a film printer can also be used. The heat transfer printing machine is different from the textile. It requires high pressure and normal working pressure is 20~30kg/cm2, generally using oil pressure. The temperature requirement is not high, the highest is 120 degrees, and the ordinary 80 degrees is enough. < /p >
< p > C. auxiliary equipment: auxiliary equipment is the key equipment of leather printing plant. It is related to product category and market share. < /p >