As we all know, taste and smell are chemical senses, and their stimulating effects are the result of biomolecular reactions. Scientific research shows that different positions of the tongue produce sour, sweet, bitter and salty taste effects, while the smell is more sensitive and can quickly smell subtle differences. However, it is easy for the nose to continue to work because of "fatigue". Therefore, it is usually recommended that perfume manufacturers not identify 3 or more kinds of flavors continuously. Then, how to detect the odor of packaging calendar printed matter and what is its detection standard? There is a test method used in the German calendar printing industry.

1、气相色谱分析法

1. Gas chromatography

气机色谱分析法在采用凹版挂历印刷包装材料的生产中广泛采用。通过气相色谱分析可以客观地确定挂历印刷过的包装上残余溶剂及其他气味的含量。在气相色谱分析过程中，气体通过一个分离柱，受到检测器的测量，即便有很少量的气体也可以被检测出来。火焰电离检测器（FID）是其主要的检测工具，将该检测器连接到PC机上，从而记录下时间以及离开分离柱的气体量。通过与已知流体色谱比较可以鉴别出各游离单体情况。同时，通过测量记录峰面积并与已知体积比较，可以得到各游离单体的含量。在考察折叠纸盒未知单体的情况时，通常将气相色谱分析法与质量法（MS）一起使用，通过质谱法鉴别未知单体。在气相色谱分析法中，顶部空间分析的方法通常用于分析折叠纸盒，被测度样放入样品小瓶中进行加热，使被分析的单体气化并进入顶部空间，随后的过程与前面所描述的测试过程一样。

Gas chromatography is widely used in the production of packaging materials printed by gravure calendar. The content of residual solvent and other odors on the printed package of calendar can be determined objectively by gas chromatography. In the process of gas chromatography, the gas passes through a separation column and is measured by the detector. Even a small amount of gas can be detected. Flame ionization detector (FID) is its main detection tool. Connect the detector to PC to record the time and the amount of gas leaving the separation column. Compared with the known fluid chromatography, the free monomers can be identified. At the same time, the content of each free monomer can be obtained by measuring the recorded peak area and comparing it with the known volume. When investigating the unknown monomer of folding carton, gas chromatography and mass spectrometry (MS) are usually used to identify the unknown monomer by mass spectrometry. In gas chromatography, the headspace analysis method is usually used to analyze folding cartons. The measured sample is put into the sample vial for heating to vaporize the analyzed monomer and enter the headspace. The subsequent process is the same as the test process described above.

2、Robimson检测法

2. Robimson test

在德国标准DINlog55“包装材料对测试物味道的影响”中对Robinson检测法做了定度。对于挂历印刷、人们所关心的是油墨挂历印刷之后溶剂残留物的影响，因此，挂历印刷厂通常使用改良的Robinson测试方法（MHM），以达到检测的目的。

The Robinson test method is calibrated in the German standard dinlog55 "influence of packaging materials on the taste of test objects". For calendar printing, people are concerned about the influence of solvent residue after ink calendar printing. Therefore, calendar printing plants usually use the improved Robinson test method (mhm) to achieve the purpose of detection.

在检测过程中，在承印物表面以1.5%m2的油墨量挂历印刷，然后将该挂历印刷品及包装成品，例如装上巧克力之后旋转一定时间（大约）后进行包装物味道的评判，结果通常分为5等：0等味道没有任何改变；1等很难辨别出味道的变化；2等味道有轻微的改变；3等味道有一定的改变；4等味道有明显的改变。有时候，也有人在实际的环境条件下进行检测，例如将纸盒入在高温75%RH下进行检测，这样做的结果通常与在DINlog55中规定的方法会有较大的差别。

In the process of detection, the calendar is printed on the surface of the substrate with an ink amount of 1.5% m2, and then the calendar print and packaging products, such as chocolate, are rotated for a certain time (about a day) to judge the taste of the packaging. The results are usually divided into five grades: no change in the taste; 1. It is difficult to distinguish the change of taste; 2. Slight change in taste; 3. The taste has a certain change; 4. The taste has changed significantly. Sometimes, some people carry out detection under actual environmental conditions, such as putting the carton into the high temperature 75% RH for detection. The results are usually quite different from the methods specified in dinlog55.