Composite packaging materials are made by heat-sealing films with different characteristics with special adhesives to overcome the inherent defects of a single film, and finally can be used in various packaging bags. A. Development status and scope of application of  composite packaging materials       According to statistics, 30% of product competitiveness comes from packaging!     Packaging is the “silent salesman” of goods. In addition to protecting goods, it must also be devoted to beautifying, promoting, and inducing consumers’ desire to buy, so as to enhance the sales competitiveness of goods in the market. All in all, the importance of product packaging is that packaging directly affects the consumer’s psychological orientation and purchasing behavior of customers, so how to make product packaging design cater to consumers’ buying psychology is an important factor in promoting product sales.      As the name implies, composite packaging materials refer to packaging materials in which thin, soft, multi-layer materials are combined through a composite process, so they are also called flexible packaging materials, mainly composed of various plastic products.     With the development of packaging technology in my country, composite packaging materials have also shown new development trends. Generally speaking, composite packaging materials have the characteristics of protection, functionality and decoration. Its specific performance is: ①The packaging should play a protective role during the transportation, storage and use of the product; ②The packaging must reflect the characteristics and uses of the products it contains; ③Packaging should provide consumers with

The rise of cosmetic mask packaging bags     The rise of the attention economy has brought the whole people into the “face-seeing era”. There are many types of skin care products, which are highly sought after by women. Among them, facial mask products are easy to use and cost-effective, and gradually become the most widely used product in cosmetics, and even many men use facial masks. People use the mask to cover the face for a short time to temporarily isolate the outside air and pollution, increase the temperature of the skin, expand the pores of the skin, promote sweat gland secretion and metabolism, increase the oxygen content of the skin, and help the skin eliminate epidermal cell metabolism The products and accumulated oils and fats, the moisture and nutrients in the mask penetrate into the stratum corneum of the epidermis, the skin becomes soft, and the skin is naturally bright and elastic. Therefore, facial mask packaging has become an important category in flexible packaging, and more and more companies specialize in making facial mask bags and films. The mask is composed of membrane materials and essences. The essences mainly include water, moisturizers, preservatives, viscosity modifiers, efficacy or plant extracts, soothing ingredients, stabilizers, flavors and pigments, etc. It is rich in amino acids, collagen, vitamins and biologically extracted active substances. Material requirements for the packaging bag of the mask       Therefore, the packaging material of the mask must have: a. Excellent oxygen and moisture resistance; b. Good

    As a flexible packaging material, whether it is used for bag making (three-side sealing bag, self-supporting bag, zipper bag, eight-side sealing bag), or as a roll film, the heat-sealing strength value must meet the standard requirements, so that it can be sealed, compressed, Anti-mechanical shock, boiling, steaming and other aspects provide safety protection for the package contents. Heat-sealing strength is a very important physical index of composite film, a key control point in the bag making process, and a major issue that has caused disputes between packaging material producers and users. Composite strength is the focus of frequent discussion and attention in the flexible packaging industry. Maybe everyone has summarized a set of effective control schemes. Now based on production practice experience, we will discuss the factors that affect the heat seal strength to stabilize packaging during the use of composite film. Provide some reference opinions on product quality, reduction and elimination of various potential risks caused by abnormal heat seal strength. A. Definition and standard of heat seal strength      Heat-sealing strength is also called heat-sealing strength, bonding strength, sealing strength and sealing strength, etc. It is the inner layer material of the composite film that bonds the molten materials together by heating and pressing, and after cooling to normal temperature, the bonding There is a certain degree of firmness, and the firmness of this fit is the heat seal strength. According to the specified sampling and testing methods, the specific value of the sample can

The flexible packaging film raw materials we currently use are basically non-degradable materials. Although many countries and companies are currently working on the development of degradable materials, there are currently no alternatives that can be mass-produced for degradable materials that can be used in flexible packaging. As the country pays more and more attention to environmental protection, many provinces and cities have successively issued regulations that restrict plastics and even “ban plastics” in certain areas. Therefore, for composite flexible packaging companies, a correct understanding of degradable materials is a prerequisite for making good use of degradable materials and realizing green and sustainable packaging. A. Definition and classification of degradable plastics. The degradation of plastics refers to the process in which the structure of plastics undergoes significant changes and performance loss due to environmental conditions (temperature, humidity, moisture, oxygen, etc.). The degradation process will be affected by many environmental factors. According to its degradation mechanism, degradable plastics can be divided into photodegradable plastics, biodegradable plastics, photo-biodegradable plastics and chemically degradable plastics. Biodegradable plastics can be divided into completely biodegradable plastics and incomplete biodestructive plastics according to their degradation methods. 1. Light-degradable plastic Light-degradable plastic means that the plastic material undergoes a cracking and decomposition reaction under sunlight, causing the material to lose its mechanical strength within a period of time after sunlight exposure, turning into a powder, and some can be further decomposed by microorganisms. Natural ecological cycle. In other words, after the molecular chain of photodegradable plastic is destroyed by

Introduction As the heat-sealing layer of the composite packaging material, since it is in direct contact with the packaged object, and the packaged object is mostly food, it is first necessary to consider its hygienic properties, and also its transparency, penetration resistance, Good heat sealability and opening properties. When designing packaging, the heat-sealing layer is an important part of composite packaging to meet the requirements of item packaging and must not be taken lightly. The following is a description of the materials used in the heat-sealing layer of the composite packaging material. 1. Polyethylene film The polyethylene used for the composite heat-sealing layer is mainly low-density polyethylene and linear low-density polyethylene (some products also use medium-density and high-density polyethylene films as the heat-sealing layer), and generally use two types of polyethylene Use after blending in a certain proportion. According to different processing methods, it can be divided into blown film, cast film and extrusion coating film. The thickness of the composite polyethylene film can be selected according to the requirements of the packaged material. The thinner can be about 20μ, and the thicker can be greater than 100μ. Since there are many additives in the resin used to produce films, especially slip agents, the migration of additives should be paid attention to during production. Metallocene polyethylene can be said to be a revolution of polyethylene resin, so that the film made of metallocene polyethylene has good thermal adhesive strength, heat sealing strength, and certain anti-sealing pollution performance. At present, the

    In recent years, the demand for flexible packaging film products has been increasing, and the proportion has been rising. This is because the customer’s automated production level is gradually improving, and packaging film rolls can reduce labor costs and labor intensity, and improve production efficiency. Therefore, whether it is in the fields of medicines, cosmetics, food, daily chemicals, and industrial fields, the use of packaging film has been increasing. Then I will explain the control points of composite flexible packaging film on three points:     First. C.O.F (coefficient of friction).     Second. Product flatness.     Third. Stretch and shrinkage of roll film products.   First. C.O.F (coefficient of friction)     Packaging roll film products are required to be smoothly applied to automated packaging equipment. Therefore, the first point of packaging film products is to match the performance of automated equipment. Generally, the most basic requirements for automatic packaging equipment for film rolls are whether the machine can pass the material and whether the drawing is smooth, which involves a key point in the production of roll film-C.O.F (that is, coefficient of friction). The friction coefficient, when we are producing, we often only consider two aspects at present: one is the friction between the packaging film fabric and the fabric, and the other is the friction between the inner layer and the inner layer of the packaging film. When we do the test, we also Only focus on these two friction coefficients. However, if it

     Definition of composite materials:     Combine materials with different characteristics to improve the air permeability, moisture permeability, oil resistance, water resistance, and chemical resistance of packaging materials, so that they can prevent insects, dust, microorganisms, light, fragrance, and odor It has better mechanical strength and processing applicability, as well as heat resistance, cold resistance, and impact resistance, as well as good printing and decoration effects. The composite flexible packaging material must be made into various packaging bags before it can be used.     Classification of composite packaging bags     After the composite material is made into bags, it can be classified into: three-side sealing bag, yin-yang bag, middle sealing bag, pillow bag, five-side sealing bag, eight-side sealing bag, stand-up bag, zipper bag, straw bag, roll film, etc.      According to the function, composite packaging bags can be classified into: high-yin diaphragm bags, retort film bags, antistatic film bags, antibacterial film bags, anti-fog film bags, vacuum bags, chemical resistant film bags, deoxygenated packaging film bags, modified atmosphere packaging Film bags etc.     Classified by material: laser aluminized film composite paper material, laser transfer paper material, paper composite material, aluminum composite material, plastic composite material, fabric composite material, etc.        Bag making method of composite packaging bag     The composite flexible packaging material must be made into various packaging bags before it can be used. There are two ways to make bags. One is that the packaging manufacturer uses roll film to

Introduction In the packaging bag printing process, the ink film color of the color printing packaging bag mainly depends on the ink concentration and transfer rate in the printing work. For some specific substrates or specific working inks, the concentration of the working ink is relatively fixed, and the transfer rate depends on the ink viscosity and other factors, as well as the printing speed and other factors. It should be noted here that these elements will have different effects on the highlights, shadows, and midtones of the printed matter when they change. 1. Change of temperature and humidity If the room temperature and the liquid temperature of the ink change drastically, the migration state will change, and the color tone will change accordingly. This is because the temperature change affects the viscosity of the ink. At the same time, the dry weather of high temperature and low humidity will have a significant impact on the ink transfer rate of the highlight part. Therefore, the temperature and humidity of the printing workshop must be controlled in any case when printing high-end products. In addition, when using the ink in winter, preheat it in advance to reduce the temperature change of the ink itself. 2. Separation of synthetic colors This kind of phenomenon is prone to occur in light colors and mixed colors of organic colors and inorganic pigments, which have very different specific gravities. Especially when the ink flow in the ink tray is too slow, the precipitation will promote

    Eight-side sealing bags are very popular in the plastic packaging industry. What is an eight-side sealing bag making machine? As the name suggests, there are eight sealing edges, four sealing edges at the bottom and two sides on each side. This bag type is a new bag type that has emerged in the past two years. At present, many well-known Chinese e-commerce brands are using this bag type. Squirrel, Loulan Honey, Qilixiang, etc. The eight-side sealing bag is widely favored by consumers because of its good three-dimensional effect, relatively high-end appearance, and high-end atmosphere. Although its price is a bit more expensive than ordinary packaging bags, it has a wide range of applications and covers a wide range of foods. Such as red dates, walnuts, pecans, macadamia nuts in dried fruits, milk powder, oatmeal, protein powder in nutritional products, beef jerky and buns in snack foods, and eight-side seals are also commonly used in tea packaging. Packaging bag.       So why can it get so many types of food packaging in love? There must be a reason for this, the reason is that the eight-side seal packaging bag has many advantages. Next, Shanghai Duxia Industry and Trade Co., Ltd. will introduce the advantages of eight-side sealing bags:       ①. It has better stability than other bags. Its bottom has four sealing edges, so that the bottom is flat, and it can stand like loose with or without food. Whether it is on sale or

    Since milk is a fresh drink, it has very strict requirements on hygiene, bacteria, temperature and other aspects. Therefore, there are special requirements for the printing of packaging bags, which makes the printing of milk packaging film different from other printing technology characteristics. The selection of milk packaging film must meet the requirements of packaging, printing, processing, storage and transportation, and hygiene. At present, the commonly used film material is mainly polyethylene (PE) co-extruded film, which is a polyethylene resin through melt extrusion and blow molding.   Types of film for milk packaging    According to its layer structure, it can basically be divided into three types.     1. Simple packaging film     Generally, it is a single-layer film, which is produced by various polyethylene materials with a certain proportion of white masterbatch and film blowing equipment. This kind of packaging film has a non-barrier structure and is hot-filled by pasteurization (85°C/30min) with a short shelf life (about 3 days).       2. Three-layer black and white co-extrusion packaging film    A high-performance composite film made of LDPE, LLDPE, EVOH, MLLDPE and other resins, co-extruded and blown with black and white masterbatch. The black masterbatch added in the heat-sealed inner layer plays a role in blocking light. This packaging film uses ultra-high temperature instantaneous sterilization and hydrogen peroxide sterilization, and its shelf life can reach about 30 days at room temperature.     3. Five-layer black and white co-extrusion packaging film   The intermediate barrier layer (composed