复印机、激光印字机在社会各行各业已被广泛 应用，成为人们得心应手、乐于应用的高科技产品，但复印件与激光印制件却都存在着字迹不牢、易脱落的致命弱点，成为档案工作中的一大隐患，给档案的长久保存增加了不安全因素。具体原因是： 一是碳粉不具有渗透性，字迹易脱落。碳 Copiers, laser printers in all walks of life has been widely used, people become handy, ready to apply high-tech products, but the photocopies and laser printing but there are handwriting weak, easy to fall off the initiative to become a file job One of the major hidden dangers in the long-term preservation of the file adds insecurity. The specific reasons are: First, the toner does not have permeability, easy to fall off the handwriting. carbon