[Chinese Packaging Network News] We know that printed packaging materials have different degrees of odor, depending on the composition of the ink used and the printing method. First of all, it should be noted that the emphasis is not on what the scent it emits is, but on the actual impact of the package formed after printing on its content. As we all know, taste and smell are chemical sensations, and their stimulatory effects are the result of biomolecular reactions. Scientific research shows that: different positions of the tongue will produce acid, sweet, bitter, salty taste effects, and the sense of smell is more sensitive, can quickly smell the nuances of odors, but the same nose is also very easy to "fatigue" Continuing to work, it is generally recommended that perfumers do not continuously identify more than three flavors. Then, what is the detection standard for the odor of packaging prints? There is a detection method used by the German printing industry. 1. Gas chromatographic analysis Gas chromatographic analysis is widely used in the production of gravure printing packaging materials. The content of residual solvents and other odors on the printed package can be objectively determined by gas chromatography analysis. During gas chromatography, the gas passes through a separation column and is measured by the detector. Even a small amount of gas can be detected. The flame ionization detector is its main detection tool. The detector is connected to a PC to record the time and the amount of gas leaving the separation column. Each free monomer condition can be identified by comparison with known fluid chromatography. At the same time, the content of each free monomer can be obtained by measuring the area of ​​the recorded peak and comparing with the known volume. In the case of an investigation of the unknown monomer in the folding carton, gas chromatography is usually used together with the mass spectrometry to identify unknown monomers by mass spectrometry. In GC analysis, the headspace analysis method is usually used to analyze the folding carton, and the sample to be measured is placed in a sample vial for heating to vaporize the analyzed monomer and enter the headspace. The subsequent process is the same as the previous method. The same test procedure is described. 2. Robimson test The Robinson test was scaled in the German standard DIN log 55 "Influence of packaging materials on the taste of test materials". For printing, what people are concerned about is the effect of solvent residue after ink printing. Therefore, the printing factory usually uses the improved Robinson test method to achieve the purpose of detection. During the inspection process, the surface of the substrate is printed with an amount of ink of 1.5% m2, and then the printed matter and packaged product, such as chocolate, are rotated for a certain period of time and evaluated for the taste of the package. The result is usually divided into 5 levels: 0 There was no change in taste, etc. 1 It was difficult to discern changes in taste; 2 there was a slight change in taste; 3 there was a certain change in taste; 4 there was a noticeable change in taste. Occasionally, some people also perform tests under actual environmental conditions. For example, the carton is placed under a high temperature of 75% RH, and the results are generally quite different from those specified in DIN log 55. The above two methods have quantitatively tested whether the effect of the ink on the odor and taste of the package after printing of the printed matter is safe through practical means, thereby providing a definitive method for evaluating whether the carton package printing is environmentally friendly and safe. China's printing factories and relevant departments can make reference to foreign advanced detection methods and international standards, formulate testing methods and standards that are in line with international standards and meet the production conditions in China, so as to promote the development of the printing industry. A shoe rack is a storage unit designed for holding shoes. Shoe racks may be free-standing to place inside a closet or may be built into a closet organizer system. The right type of rack for you depends on the number of shoes you have to store and where in your home you want to store shoes. Modern Shoes Rack,Shoes Bench,Shoes Cabinet,Storage Rack,Wooden Shoes Rack,Wooden Shoes Cabinet,Shoes Storage Cabinet Jinan Tri-Tiger Technology Development Co., Ltd , https://www.tritigerwooden.com
Many people who have a large shoe collection have built-in racks in their bedroom closets. Each rack may hold several pairs of shoes. Some shoe racks are slanted wooden boards that have a strip running across the back to rest the heels of the shoes on so that the shoes are displayed for easy selection.
Other types of shoe holders are white metal stackable shelves that are either part of a closet shelving system or are a part of a free-standing rack. With the shelf type, you can just place pairs of shoes on the shelves side by side. Some kinds of shoe racks have curved wire loops that you place the shoes over.
A shoe rack is an alternative to shoe boxes. Clear acrylic shoe boxes that each hold one pair of shoes can be stacked anywhere and some people prefer to use these for shoes not worn too often. Shoe boxes may be stored up high in a closet, while the racks are usually on the floor or at eye level to allow easy access to the shoes.
Shoe racks can be added to entryway closets to avoid the clutter of shoes in the hallway near the front or back door of a home. Some people like to keep a small shoe rack near doors to hold shoes worn daily and/or guest's shoes. While the looped type can typically be only used to hold shoes, shoe shelves can be used to store practically anything from rolls of gift wrap to children's toys to extra pantry supplies. Free-standing racks usually fit into any type of closet and keep items organized and out of sight.