Solvent residual odor and solvent purity detection methods

Recently, with CCTV's exposure to the "Gansu Food Poison Bag" incident, the community has paid full attention to the problem of “excessive solvent residue levels” that threaten human health risks—films for food and pharmaceutical packaging. Note: The national quality and technical supervision bureau GB/T200 expressly provides that: the residual amount of solvent food packaging should be ≤ 10mg/m2, of which benzene solvent residue ≤ 3mg/m2). Its meaning is: If the solvent residues in the various packaging bags we use exceed this standard, then the residual solvents in the toluene, xylene, butanone, isopropanol, ethyl acetate and other substances will be similar to the invisible killers. Human body produces a great threat!

Therefore, the social responsibility of “strictly controlling the residual amount of organic solvents” has undoubtedly put our flexible packaging companies on the forefront. So, what causes the excessive amount of solvent residue? How to control the production process? How to detect the residual amount of solvent in the "GC-9800 Gas Chromatograph"? What should be noted in the test? Composite film will do what?

There are many factors that cause excessive solvent residue (odor), such as: improper selection of substrates, non-standard production process, aging of equipment, lack of necessary inspection and control in production, etc., all of which are directly related to excessive standards (odor) Or indirect impact. In terms of raw materials, the quality of the ink, the releasability of the ink, the thickness of the ink, the quality of the adhesive, the amount of coating, etc., the purity and the amount of the organic solvent, and the compatibility with the substrate will all affect the solvent. The residual amount. In addition, the flexible packaging production equipment is too simple and the heating temperature is not suitable due to aging, lack of drying air volume, or no clear operating instructions, employee operation is not standardized, the boot printing speed is not up to standard, the additive is insufficient, the coating is uneven, and the finished packaging materials More casual and so on, are the main factors causing it to exceed the standard.

In particular, it is worth mentioning that a large number of flexible packaging companies completely omit the "quality inspection" as an important control link during the entire production process, and there is no special testing equipment for professional testing of residual odor and purity of solvents. According to the “bag odor” elbow detection meter, simple judgments rely on people’s sense of smell based on experience alone. This non-scientific method greatly increases the probability of occurrence of excessive solvent, which will cause problems for users and society. Major hazards. In September of this year, a certain company produced masks with severe odor and used our GC9800 gas chromatograph to test it. The result showed that the content of benzene has reached 7mg/m2, causing excessive odor due to excessive levels of benzene. The direct economic loss caused by this is up to one million yuan (not to mention the reprocessing costs of these superlaminated composite membranes)! Imagine: If the company pays attention to enhancing the quality control of important processes in advance and it is equipped with a dedicated gas chromatograph, can it be avoided? What happened to this result?

Based on the above analysis, it can be concluded that: a reasonable composite layer structure, reasonable procurement and use of raw materials, the correct production process, configuration of the necessary professional testing equipment - GC9800 gas chromatography, the implementation of strict standards of testing methods, production of qualified Safe composite packaging is entirely possible.

The professional test equipment in the field of flexible packaging - GC9800 gas chromatograph application, the working principle of the hue chromatogram is: the gas is used as the mobile phase, the solid phase is the chromatographic method of the stationary phase. The components that need to be separated are distributed between the mobile phase and the stationary phase. The chromatographic process is the repeated adsorption and desorption, or dissolution and resolution of the sample components as they pass through the column. Because the adsorption energy or distribution coefficient of each component is different, the moving speed in the direction of the carrier gas is different, and the elution time from the column is different, so that the components are separated. The components flowing from the column enter the detector and the chemical signals are converted into electrical signals and recorded to obtain the qualitative and quantitative information of each component.

GC9800 gas chromatograph is a high-precision intelligent detection system that is used to accurately and rapidly detect the solvent residual content of printing and packaging products and detect the purity of solvents. It has the features of fast qualitative and quantitative analysis, intuitive contrast performance, and accurate and reliable data. :

1. Not only can directly display the name of each residual solvent of the packaging film, such as: isopropyl alcohol, ethyl acetate, butanone, benzene (toluene, xylene), etc., and it does not need to be accounted for and measured directly to show the packaging film per square. The amount of milligrams (mg/m2) of solvent remaining in the meter results in an intuitive, convenient and accurate data.

2. In addition to the residual solvent content of the detectable packaging film, the purity of the solvent used can also be detected to identify the compositional properties of the odorless solvent, such as isopropyl alcohol, ethyl acetate, butanone, benzene (toluene, xylene) and other solvents. , After chromatographic detection, can be quickly and quickly measured the contents and impurities and other unknowns, this can effectively prevent the doping of solvents, to prevent the use of substandard products. GC9800 gas chromatograph can effectively adjust the production process for packaging companies and control the solvent to provide an accurate direction. For example, if the benzene class exceeds the standard, the process parameters that need to be adjusted in the printing process can be immediately determined to improve the volatilization efficiency of the solvent. , you can judge the problems existing in the dry recycling process and make adjustments in time; testing the semi-finished products can effectively determine the amount of solvent in the printing process, provide guidance for production quality control, and conduct inspections in the composite process to effectively identify composites. The indicator of the solvent in the process.

The GC9800 gas chromatograph can be used to determine whether the residual solvent content of the packaging film is excessive or not, whether it is necessary to re-develop the production process, and to provide theoretical and technical support for the proper use of the substrate, etc., fundamentally comprehensive Controlling the generation of excessive amounts of residue (Note: This instrument is supplied by Guangzhou Standard Packaging Equipment Co., Ltd. - the only one in the supply chain of domestic soft packaging testing instruments). It is important to mention that the sampling representative, the first inspection before compounding, and the post-curing inspection are the key considerations for using the GC9800 gas chromatograph.

The GC9800 GC is economical and practical, with superior performance and reasonable price. Chromatography workstation connected, eight-step temperature program can be more quickly and accurately detect the measured substances, with five kinds of detectors for customers to choose to meet the different detection areas: FID ion flame detector used to detect the content of organic compounds; TCD thermal conductivity Detectors are used to detect and analyze permanent gases, water and low carbon compounds; FPD flame photometric detectors are suitable for pesticide residues and phosphorus analysis; ECD electron capture detectors are suitable for the analysis of pesticide chlorine solvents; NPD nitrogen and phosphorus monitors are suitable for trace amounts. Nitrogen and phosphorus detection. Guangzhou Standard and China Plastics Association have jointly promoted the development of flexible packaging inspection technology. A few days ago, Guangzhou Standard & Poor's Co., Ltd., at the invitation of the China Plastics Association Composite Film Products Professional Committee, represented the flexible packaging inspection industry at the 4th annual meeting of the Association, and focused on the "Gansu Food Bag Pouch" which has recently received full attention from all walks of life. In the event, a technical seminar titled "Control and Detection of Residual Odors in Solvents" was made. As the only one of many suppliers of testing equipment, it can provide professional testing equipment—GC 9800 Gas Chromatograph (professional high-precision intelligentized detection system for detecting the residual content of solvents and the purity of solvent for printing and packaging). The meeting adopted the “combination of cases and interoperability consultation” approach to address the social issues caused by excessive solvent residues in the flexible packaging field. In combination with the case, the author analyzed the causes of the odors, and discussed the selection of raw materials for printing and the process of odor. Process control, odor / processing technology, etc., and on-site questions for delegates, focusing on the professional testing equipment in the flexible packaging industry - Guangzhou Standard GC9800 gas chromatography detection technology. After field trials and demonstrations, industry users fully affirmed the performance of the series of gas chromatographs and expressed their strong interest in buying. In addition, representatives of the participating companies are able to fully meet the relevant testing needs of the flexible packaging industry at the time of the Guangzhou benchmarking: back pressure cookers, electronic tensile testing machines, friction coefficient analyzers, solvent moisture analyzers, water permeability and oxygen permeability Instruments such as analyzers and heat sealers are also given full attention.

(Luo Xiaoyu)

Source: China Flexible Packaging News

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