Maleic anhydride will give you a brief introduction to problem analysis and attention to carbon free carbon paper:

无碳复写纸是一种具有直接复印和直接显色功能的无色复印纸。它的显色主要是：在外力的作用下，力敏感颜料和微胶囊中的油溶液溢出并与显色剂接触，引起染色反应，从而起到改写的作用。

Carbon free copy paper is a kind of colorless copy paper with direct copy and direct color development functions. Its color development is mainly: under the action of external force, the oil solution in force sensitive pigment and microcapsule overflows and contacts with the color developer to cause dyeing reaction, so as to play the role of rewriting.

无碳复写纸是一种用途广泛的产品，尤其是在公司财务部门为收据开具发票时。购买时，请尝试在中下层购买一个三层纸的商标，以使成分相同，不会引起色差的现象。并且生产日期不要间隔太长，因为各个制造商的产品在白度，色密度，光滑度，厚度，刚度，印刷表面抗张强度，彩色纸的色调，紧密度，油墨吸收性等方面均不统一指标。相同，因此我们必须购买具有相同制造商日期间隔的产品。

Carbon free carbon paper is a widely used product, especially when the company's financial department issues invoices for receipts. When buying, please try to buy a trademark of three-layer paper brand in the middle and lower layers, so that the ingredients are the same and will not cause color difference. And the production date should not be too long, because the products of various manufacturers have different indicators in whiteness, color density, smoothness, thickness, stiffness, tensile strength of printing surface, hue, compactness and ink absorption of color paper. The same, so we must buy products with the same manufacturer date interval.

顺丁烯二酸酐

Maleic anhydride

还应注意表面强度，以确定是否掉落了粉末，是否掉落了头发并产生了糊状物；无碳复写纸的不透明性可以减少胶印；纸张的均匀性可以减少印刷皱纹；光滑度决定了打印压力和墨水量。

Attention should also be paid to the surface strength to determine whether powder has fallen, whether hair has fallen and paste has been produced; The opacity of carbon free copy paper can reduce offset printing; The uniformity of paper can reduce printing wrinkles; Smoothness determines the printing pressure and ink volume.

无碳纸在纸上有涂层，在纸的两面都有涂层，在下部纸上有涂层。因此，使用时要注意方向性，否则会造成不可逆的书写。组件上的湿气导致原纸变形和涂层损坏，因此无法重写。如果温度太低，将影响显色速度，但不会影响显色效果。建议为票证使用专用垫板，以便在书写压力下可以增强显色效果并防止重写到下一组。

Carbon free paper has a coating on the paper, a coating on both sides of the paper, and a coating on the lower paper. Therefore, pay attention to directionality when using, otherwise it will cause irreversible writing. Moisture on the component causes deformation of the base paper and damage to the coating, so it cannot be rewritten. If the temperature is too low, it will affect the color development speed, but will not affect the color development effect. It is recommended to use special backing plates for tickets so that the color rendering effect can be enhanced under writing pressure and rewriting to the next group can be prevented.