Application problems and Countermeasures of the ho

Application problems and Countermeasures of cooking packaging bags

Application of cooking packaging bags in China

1. Distribution of cooking packaging bag production enterprises in China

cooking packaging bag production enterprises in China are mainly distributed in Liaoning, Jiangsu, Shandong, Zhejiang, Fujian and other regions, with a certain production capacity in Guangdong, Hunan, Fujian and Shanghai. Yunnan, Guizhou, Guangxi, Hainan, Jiangxi, Anhui, Henan, Hebei, Xinjiang, Gansu, Shaanxi, Ningxia, Inner Mongolia, Heilongjiang, Jilin and other provinces produce a small amount. In Sichuan, there are mainly steam bags, while cooking bags are relatively few. There are not many enterprises making cooking bags in Guangdong, which are scattered

2. Technical status of cooking packaging bags in China

cooking packaging bags also bring high risks because of high investment and high efficiency. This puts forward higher requirements for cooking packaging technology. In general, large and medium-sized flexible packaging enterprises have a high level of technology, less problems encountered in the production of cooking packaging bags, and less quality accidents. Due to the influence of strength and management concept, small enterprises have many quality problems. The improvement of cooking bag technology depends on the improvement of the quality of raw and auxiliary materials

3. Nylon film, the main raw material of cooking packaging bags in China, has the advantages of high permeability, puncture resistance, low temperature resistance and good oil resistance. It is mainly used in cooking bags, freeze vacuum packaging, preservation of fresh meat, cheese, flavored food and making cover materials. In recent years, the market consumption has gradually expanded, and it is a development trend to use it in food composite packaging. BOPA film develops rapidly in the world. Japan grows at a rate of 15% - 20% every year, and European and American countries increase at a rate of 8% - 10%. The world's total production is 110000-130000 tons per year

the quality of nylon film is very important for cooking packaging bags. With the flexible and convenient operation of the experimental machine in many domestic nylon film production enterprises, the lifting, locking and sample clamping of the moving beam are all completed by button operation. The advanced hydraulic servo drive technology is adopted to load, and the high-precision dynamic load sensor and high-resolution magnetostrictive displacement sensor are used to measure the force and displacement of the sample. The nylon film market competition is becoming more and more fierce, which is a good thing for color printing enterprises. Now the price is much lower than before. In the past, one or two domestic enterprises accounted for a large share of the market, which changed with the launch of nylon film production lines by many domestic enterprises. There are at least 10 production lines in China: Dongli branch of Foshan Plastic Group Co., Ltd., Tianjin Yuncheng Plastic Industry Co., Ltd., Xiamen Changhua Plastic Industry Co., Ltd., Zhejiang Wenzhou Jintian Plastic Industry Co., Ltd., Hebei Cangzhou Donghong packaging materials Co., Ltd., Xiaoxing film (Jiaxing) Co., Ltd., unijike polymer technology (China) Co., Ltd., zhanjiangminghe Plastic Co., Ltd., Shandong new Dongli Plastic Co., Ltd Hubei Zhongji packaging materials Co., Ltd. and Shanghai Zidong chemical materials Co., Ltd. It is expected that two thirds of the production lines will be in normal production in 2006

it is worth noting that with the development of multi-layer coextrusion technology, multi-layer coextrusion nylon film partially replaces BOPA film. The BOPA packaging market must adapt to the development of supermarkets and the improvement of living standards in order to develop reasonably. In addition, Changzhou Jianfa Plastic Industry Co., Ltd. has produced a high-temperature cooking film with nylon by the top blowing method. This film has good extensibility, high transparency, not only stiffness, but also excellent elasticity and flexibility, strong sealing and lubricating bearings; The degree of replacing rusted bearings is very high, and it can be steamed to 1210c. It is the most ideal material to replace dry composite cooking bags

at present, many manufacturers of medium temperature cooking grade CPP (rcpp) can produce it, but few manufacturers in China can really produce high temperature cooking grade CPP film (SCPP) that can withstand more than 135 ℃, such as Toray, tosailu, etc. Domestic ones include Zhejiang dadongnan, Wuxi Huanya, Shanghai Meifeng, Hangzhou Xinguang, Shanghai wisteria, etc. The reasons are: first, the demand for SCPP film is small, the order is small, and the risk is high; Second, the technical process of cooking grade CPP is not well mastered. Many domestic CPP motor sources have poor oil resistance after cooking at 135 ℃. Therefore, if you want to make 135cc resistant cooking bags, it is very important to choose suitable CPP

take 2002 as an example, the output of cooking film accounted for 15% (about 15000 tons), and some were imported. High barrier film and high-temperature cooking film have a promising prospect in the domestic market, but they also face the fierce competition of multi-layer coextrusion blown film. Multi layer coextrusion high barrier film (PET or PA) has been used in liquid food, milk, ham sausage, fresh meat packaging, oil resistant food, large infusion bags and other packaging to reduce the temperature, and its consumption has increased. The competition with CPP five layer coextrusion cast film is worthy of attention

at present, the commonly used aromatic polyurethane adhesives include ad502, uk3640, eps901, pp3100, ly-9580, yh502, yh502s, etc., and aliphatic ones include ad506s, pp5250, ly-9850f, etc. There are many adhesive factories in China, such as New Oriental, Shanghai lieyin, Zhongshan Kanghe, Beijing GAOMENG, Beihua academy, Xiangfan aerospace and so on. Foreign funded companies include Henkel, Rohm Haas, Greater Japan chemical, Mitsui Takeda. At present, the cooking adhesive of foreign-funded companies still occupies a certain market share, and domestic adhesive enterprises should strive to speed up research and development to keep up with the pace of foreign-funded companies

at present, many ink factories in China can provide high-temperature cooking ink. In addition to foreign-funded products such as Shenzhen DIC, Shanghai DIC, Jiangmen Toyo, Tianjin Toyo, there are many domestic manufacturers that can make cooking ink, such as Zhejiang New Oriental, Zhongshan Yeshi, etc. A good high temperature resistant cooking ink should be the ink with two-component reactive polyurethane as binder. Like the two-component PU adhesive, it packages the colorless curing agent and various color inks separately

main problems of cooking packaging bags in China

according to the cooking bag problems we collected, broken bags, delamination, air leakage, weak heat sealing, peculiar smell, and bag wrinkling are common problems encountered by cooking packaging bag manufacturers. Most of them are related to glue and ink. In terms of film, nylon film or cooking film with unqualified quality is mainly selected. There are few problems caused by polyester. As long as the products of large enterprises are selected for aluminum foil, there is basically no quality problem. In terms of structural collocation, many manufacturers have done better. In addition, the softness and transparency of CPP is also one of the concerns of many manufacturers

actively respond and accelerate the development of cooking packaging bags in China

1. Strengthen technical exchanges and promote the improvement of cooking packaging bag technology

industry associations or flexible packaging media should organize more technical forums, training courses and seminars on cooking packaging bags. Some enterprises have encountered problems and even accidents in the production of cooking packaging bags. If you can't solve it by yourself, it doesn't mean that others can't solve it either. If the supplier can't solve it, it doesn't mean that the peers can't solve it either. Technical exchange is a good way to solve problems. Making things behind closed doors will only make you never improve. It is better to go out and communicate more with suppliers and peers than to close yourself. I once heard from my colleagues about an example: a large flexible packaging enterprise in Zhejiang encountered a problem, and as a result, the technical personnel of this enterprise were solved by this enterprise when they talked about this problem in a flexible packaging enterprise in Zhuhai

2. Suppliers of raw and auxiliary materials should constantly improve and improve product quality, and actively develop new materials and products. The improvement of cooking bag technology is inseparable from the improvement of the quality of raw and auxiliary materials such as film, adhesive, ink and so on. Therefore, domestic nylon film manufacturers, CPP film manufacturers, adhesive manufacturers and ink manufacturers should increase investment in research and development, and constantly develop new products to serve the flexible packaging industry. Of course, color printing manufacturers should closely cooperate with raw and auxiliary material suppliers to jointly do the relevant research and development work well

3. Update the concept, do not covet cheap to buy smuggled goods or inferior products, so as to avoid losses

goods for every penny. When purchasing raw and auxiliary materials, do not covet cheap prices and choose products with poor quality, otherwise it will cause finished product quality problems and cause major losses to the enterprise. Some enterprises have learned these lessons. We should choose large-scale suppliers with a certain popularity in the industry, strong technical force and good after-sales service, so that the quality can be guaranteed. In addition, when choosing cooking glue or cooking ink, don't just listen to what the salesperson says. The key is to use it when it is stable

4. overcome difficulties and be careful

some enterprises gave up such a list because of quality accidents when making cooking bags before, and failed to carefully analyze the causes of the problems. Although making cooking bags is risky, as long as we carefully handle every production link and persevere, we will eventually succeed. Never "once bitten by a snake, ten years afraid of the well rope"

5. Speed up the formulation or revision of the current national or industrial standards for flexible packaging

some national or industrial standards for flexible packaging lag behind, hindering the development of cooking packaging bags. The current national standard for cooking resistant composite films and bags was issued in 1998. After being revised again in 2002, high temperature resistant cooking bags were included in the general rules for composite films and bags for packaging. This latest standard has been approved in Guiyang at the end of December 2002, but it has not yet been promulgated and implemented

6. do a good job in the detection of cooking bags

for flexible packaging, high-temperature cooking bags are products with high requirements, high investment and high added value. Compared with ordinary products, in addition to the detection of routine performance indicators of packaging bags should be more stringent, the following detection and evaluation should be carried out for raw materials and final products used in production according to the principle of quality critical control points:

ink, is it heat-resistant ink? If yes, what is the temperature resistance? Adhesive, is it high temperature resistant adhesive? If yes, what is the temperature resistance? Is each layer of structural film high temperature resistant? If yes, what is the temperature resistance? Can it affect the final product? Whether the final product can withstand high temperature according to the customer's requirements. If so, under what state? What is the temperature resistance? As a manufacturer of cooking bags, we should try not to let problematic products leave the factory, which requires flexible packaging manufacturers to improve the detection level. We should not only consider the accuracy of the corresponding test instruments when selecting them, but also test them according to the standard procedures in the process of operation in order to achieve the best results