In the daily production process, the problem of maintaining the consistency of label printing color has always been a difficult problem for production operators. Therefore, let's introduce the methods to control the color consistency of label printing.

一、柔印中网纹辊参数关乎颜色的一致性。

1、 The parameters of anilox roller in flexo printing are related to the consistency of color.

柔印标签产品的颜色除了受油墨色相、网点大小和密度的影响以外，还受网纹辊的网线数和网穴深浅的影响。一般情况下，网纹辊的加网线数与印版加网线数的比例为3：1或者4：1。因此，在使用柔印设备印刷标签产品时，为了保持与样品颜色接近，除了在制版过程中要注意网点的大小与密度尽量与样品一致外，还要注意网纹辊网线数和网穴的深浅，通过调整这些参数来达到标签产品与样品颜色接近的效果。

The color of flexographic label products is not only affected by the ink color phase, dot size and density, but also affected by the number of mesh lines and the depth of mesh holes of anilox roller. In general, the ratio between the number of screening lines of anilox roller and the number of printing plate screening lines is 3:1 or 4:1. Therefore, when printing label products with flexographic printing equipment, in order to keep the color close to the sample, in addition to paying attention to the size and density of mesh points as consistent as possible with the sample in the plate making process, we should also pay attention to the number of mesh lines and the depth of mesh holes of anilox roller, and adjust these parameters to achieve the effect that the color of label products is close to the sample.

二、合理的颜色管理制度。

2、 Reasonable color management system.

1、明确产品颜色的上下限。

1. Define the upper and lower limits of product color.

在我们生产某标签产品时，可以先制定出该标签产品颜色的上限、标准和下限，经客户确认后定为“样张”，日后的生产中就以样张的标准颜色为基础，并严格规定颜色的波动不能超过上下限，这样，在保证标签产品颜色一致性的同时，还能给生产人员一个合理的颜色波动范围，也使产品的颜色标准更具可操作性。

When we produce a label product, we can first formulate the upper limit, standard and lower limit of the color of the label product, which will be determined as the "sample sheet" after confirmation by the customer. In future production, we will take the standard color of the sample sheet as the basis, and strictly stipulate that the color fluctuation cannot exceed the upper and lower limits. In this way, while ensuring the color consistency of the label product, It can also give the production personnel a reasonable color fluctuation range and make the product color standard more operable.

2、完善首尾件签样、巡检及抽检制度。

2. Improve the sample signing, patrol inspection and sampling inspection system for the first and last parts.

应将标签产品颜色的检验项目加入到标签产品首尾件签样制度中，这样便于生产管理人员对标签产品颜色差异进行控制，不合适的标签产品坚决不予检验通过，同时加强巡检和抽检，以保证在标签产品印刷生产过程中能及时发现和处理超出 色差合理范围的标签产品。

The color inspection items of labeled products shall be added to the sample signing system for the first and last parts of labeled products, so as to facilitate the production management personnel to control the color difference of labeled products. Inappropriate labeled products shall not pass the inspection. At the same time, patrol inspection and sampling inspection shall be strengthened, To ensure that label products beyond the reasonable range of color difference can be found and handled in time during the printing and production of label products.

三、印刷标准的光源问题。

3、 Printing standard light source problem.

建议在印刷过程中使用印刷标准照明光源来进行照明，有条件的企业还需要配备标准光源箱，以便让员工在标准光源下面进行标签产品的颜色对比，有效的避免由于照明光源不标准导致的印刷品色差问题。

It is recommended to use the printing standard lighting source for lighting in the printing process. Conditional enterprises also need to be equipped with a standard light source box, so that employees can compare the color of label products under the standard light source, so as to effectively avoid the color difference of printed products caused by non-standard lighting source.

四、油墨问题会导致色差。

4、 Ink problems can cause color differences.

标签印刷企业在使用油墨时一定要注意使用正规厂家生产的油墨，同时要注意油墨的保质期，及时更新库存，以免使用过期油墨。另外，在印刷生产过程中要注意油墨添加剂的使用量，如果油墨添加剂使用过量，也可能导致印刷后油墨的颜色产生变化。因此，在使用各种油墨添加剂时建议先与油墨供应商进行沟通，再确定添加剂的正确比例范围。

When using ink, label printing enterprises must pay attention to the ink produced by regular manufacturers, pay attention to the shelf life of ink, and update the inventory in time to avoid using expired ink. In addition, pay attention to the use of ink additives in the printing production process. If the ink additives are used excessively, the color of the ink may change after printing. Therefore, when using various ink additives, it is recommended to communicate with the ink supplier first, and then determine the correct proportion range of additives.

以上就是控制标签印刷颜色一致性的方法，除此之外，还可以根据专色油墨的颜色和印前制版与颜色的一致性来控制。

The above is the method to control the color consistency of label printing. In addition, it can also be controlled according to the color of spot color ink and the consistency between prepress plate making and color.