Abstract: Peeling force is to evaluate the composite film peeling performance indicators, the size of the value reflects the composition of the composite film monolayer membrane composite fastness. Low peeling force of composite film materials, after making the contents of the bag packaging is prone to delamination phenomenon, resulting in composite film impact resistance, puncture resistance and other physical and mechanical properties and barrier properties decline, affecting the appearance and quality of the product. In this paper, we use the GBH-2 electronic tensile testing machine independently developed by Guangzhou Standard International to carry out the peeling test of composite film for pickles packaging, introduce the test standard, test equipment, test process, etc., and effectively evaluate the anti-interlayer peeling performance of composite film for pickles packaging. Pickled vegetables is a general term for a variety of vegetable products made from vegetables as the main raw materials and using different pickling techniques. According to the process and auxiliary materials, pickles can be divided into soy sauce, salt pickles, soy sauce pickles, sugar pickles, vinegar pickles, sweet and sour pickles, shrimp oil pickles, brine pickles, bad pickles and so on. Due to the unique aroma of sweet and crispy pickles, or salty and spicy pickles, and their nutritional value, they have won the favour of the masses and have become one of the most popular foodstuffs to accompany meals. Bagging is a common packaging form of pickles, the bag material is mainly plastic composite film, aluminium composite film, etc., generally using vacuum packaging form to prevent pickles rancidity. In the actual use of the process, some pickles finished packaging will appear composite film delamination phenomenon. If the adhesive used in the composite film and the ink used in the external printing of the package is of poor quality and not resistant to high temperature or acid or alkali, it is easy to cause the composite film to reduce the composite fastness of each single layer of the film and the composite film is prone to delamination after high-temperature sterilisation or contact with the acid or alkali components in pickles. On the other hand, if the composite film using the adhesive coating amount is too low or too thick, or uneven coating, will also cause the composite film between the layers of film composite fastness is poor, easy to occur delamination. Once the phenomenon of delamination occurs, the bag composite film impact resistance, puncture resistance and other physical and mechanical properties will decline, resulting in easy rupture of the bag, leakage; at the same time will also affect the composite film on the outside world of oxygen barrier properties, resulting in an increase in the amount of oxygen through the packaging contents are prone to deterioration, flavour, and seriously affect the appearance of the product and product quality. Theref...

From the analysis of the formation mechanism of printing fastness and test methods, we can better understand the way to improve the printing fastness (mainly on the polyurethane film for discussion).    1. Selection of raw materials In the production of plastic film should be selected when the raw material does not contain or less plastic additives. We can judge the content of additives according to the technical information about the grade, performance and use of the resin. When we have to use raw materials containing more additives, we should also mix them with those without additives. The reason for this choice is that in the process of forming and placing the folding out of the additives will form a film of oil, thus weakening the adhesion of the ink on the film.    2. Raw material modification 1) blending modification: polyolefin and printing performance of polymers blended to improve printing performance is a newly developed compelling method. For example, with polyacrylic resin modified high-density polyethylene greatly improve the adhesion of ink to polyethylene, when which is mixed with 5-20% of polymethacrylic acid early ester (PMMA), the above-mentioned adhesion increased by seven times. Again, such as with more chlorine content of chlorinated polyethylene work mixing, only a small amount can be added to significantly improve the adhesion of polyethylene and oil black. When mixed with 5% CPE-55 blends and ink bonding than (chun) HDPE three times higher. According to another report, some plastic polymer processing aids (rheology modifiers, etc.), in addition to improve yield, eliminate melt rupture, but also has to improve the role of printing adhesion. Add polyacrylic acid resin or chlorinated polypropylene and other reasons to improve the printability of HDPE is based on their poor compatibility with HDPE, when it is in the HDPE as the substrate of the blending system constitutes a dispersed phase and live in the open film surface layer, is obviously conducive to the adhesion with the ink. (2) grafting modification: grafting modification is the use of radiation and other methods to make the polyolefin points to grafting reaction so as to make the polyolefin macromolecular chain with polarity and thus improve the wettability of the material to the ink. Such as maleic anhydride or acrylic acid graft modification of linear density polyethylene after the improvement of its printability. 3) other methods of modification: such as in the polyolefin doped with a small amount of maleic anhydride or its anhydride, but also to a greater extent to improve the polyolefin film ink fastness to print.    3. Printing ink fastness in the printing ink fastness problem, the ink also plays a decisive role. Of course, for different substrates should use its corresponding ink. For example, for cellophane can use nitro cellophane resin ink; for polypropylene film can use chlorinated polypropylene resin ink; for polyethylene film...

Enterprises that aim for sustained development recognize that talent is key. To further enhance the professional capabilities and quality of  employees, GBPI has actively carried out initiatives for staff to participate in academic education and vocational skills training, enriching the spiritual and cultural life of the workforce. Hard work pays off! In March 2024, 7 GBPI employees successfully completed their studies and received their diplomas, an achievement that is both joyous and commendable. 'Only through hard work and struggle can youth sound its most resonant call to action; only through learning and research can life be elevated to its highest form. We are grateful to the company for providing the opportunity to advance our education and a platform to showcase ourselves.' We extend our warmest congratulations once again to the 7 GBPI colleagues who graduated! GBPI has always placed great importance on the enhancement of employees' skills and education, strongly supporting and encouraging staff to pursue further studies, and providing subsidies and rewards for those who obtain relevant academic degrees and professional certificates. The employees, in turn, actively apply the knowledge and skills they have acquired to the company's technological innovation and product R&D, injecting new vigor into the company's development and achieving a win-win situation for both the company and the individuals.

The packaging of candy has three main functions. First, it protects the luster, fragrance, and shape of the product and extends its shelf life; second, it prevents microbial and dust contamination and improves product hygiene and safety; third, exquisite product packaging can enhance consumer awareness, purchase desire and commodity value. The packaging forms of candy mainly include twist packaging, pillow packaging, and folding packaging. Twist packaging is the oldest form of packaging. This packaging form is mostly used for candies. Pillow packaging machines are more popular. Most candy manufacturers currently use pillow packaging, while folding packaging is mostly used for chocolate products. The protective function of packaging is directly related to the quality of candy. Since the ingredients of candies themselves vary greatly, packagers have different requirements for the selection of packaging materials for different types of candies. Candies with a low water content are prone to moisture absorption, causing the product to shrivel and become sandy; candies with a high water content are prone to shrinkage and mildew, and ingredients such as starch and butter are prone to oxidation and deterioration when exposed to oxygen. Therefore, special attention should be paid to the gas and moisture-proof functions of candy packaging. Testing of packaging barrier properties: Since the intervention of oxygen and water vapor will cause the deterioration of candy, it is very important to control the oxygen content and water vapor content in the air environment around the candy. This requires controlling the barrier properties of candy packaging materials and the overall packaging. Oxygen Transmission Rate Analyzer Water Vapor Transmission Rate Analyzer Testing of packaging sealing performance: The testing object of sealing performance is the leakage point of the package. By conducting sealing performance testing, data such as the maximum pressure of the packaging and leakage points can be obtained. The GBM-D1 intelligent sealing performance tester can be used with different fixtures to test packaging for bursting, leakage, creep, bubbles, etc. Intelligent Leakage & Sealing Performance Tester Testing of packaging pressure resistance and burst resistance: This testing index can be used to measure the pressure resistance performance of candy packaging and to evaluate the pressure resistance performance of candy packaging during storage, transportation, and sales display. The GBN200G pressure resistance tester is suitable for Test the pressure resistance and bursting strength of various packaging bags. Pressure Resistance Tester Testing of the peeling force of packaging and the mechanical properties of packaging materials: The sealing strength of candy packaging is insufficient, which can easily cause sealing problems during storage, transportation and shelf display of the candy.  If he sealing strength of packaging is too high, which will also brin...

Paper cups are one of the main disposable packaging containers. The general raw materials of disposable paper cups are food-grade wood pulp paper and food-grade PE film, although the outer layer is paper, but the contact with food is the inner plastic film. In the process of use, disposable paper cups usually come into contact with high temperature, acidic and alkaline liquids, and if the paper cups contain more migratory substances, this will migrate to the human body through the food in the process of use, which will have an impact on human health. In order to ensure its safety，worldwide countries have established their own designated food contact materials testing regulations, such as the U.S. FDA 21 CFR, the European Union EU NO 10/2011, Germany LFGB, France DGCCRF, Japan JFSL 370, Italy D.M.21/03/73, UK SI 898, China GB 4806, GB 9685, GB-31604.8. Experimental principles The migration test is performed by selecting the appropriate pretreatment conditions and food simulants according to the characteristics of the food products to which the samples will be exposed in the actual use scenario. The evaporator cup is heated at a set temperature, cooled, weighed, and the procedure is repeated until a constant weight is reached. The simulants were added into the evaporation cup, evaporated in a water bath, dried in a chamber heated to 105℃, and cooled. After the evaporation dish is cooled, the constant weight is determined by a balance (with a sensitivity of 0.01mg), and the experiment is terminated to meet the constant weight requirement of the project. Full-Automatic Total Migration Tester ZF900 Experimental conditions Food simulants selected 4% acetic acid (v/v) and 20% ethanol (v/v); experimental conditions for 70 ℃, 2h; samples for disposable paper cups using the filling method, paper cups filled volume of 150mL food simulants ,S according to the actual contact area for calculation, the number of samples for a blank and 2 parallel samples. The experimental process A food simulant of V=150mL was measured in a measuring cylinder, filled into a disposable cup, sealed with two layers of plastic wrap, tied with a rubber band, and immersed in a preheated oven at 70°C for 2h. A 4% acetic acid blank solution and a 20% ethanol solution were made from the same batch. The contact surface of the food simulants in the disposable cups was calculated as S. A 4% acetic acid blank and a 20% ethanol solution were made from the same batch. Quantitatively measure 100 mL of the pre-treated sample solution, denoted as V1. The solutions were separately added to the AUTO ZF900 Total Migration and Nonvolatility Tester for testing. The automated process of constant weight in empty cup, evaporation in water bath, constant weight in residue and solvent recovery was carried out. Analysis of results The assay data of disposable paper cups measured in 4% acetic acid and 20% ethanol food simulants are shown in Table 1. Table 1 Test results of disposable pap...