The package of soft shell plush Bing Dwen Dwen clearly indicates that the shell material is "silicone rubber"   The manufacturing process of "Bing Dwen Dwen" silicone shell belongs to one of molding. Molding can be processed by solid or liquid production process. The raw material of the solid silica gel molding process is solid. After being mixed by a mixer, it is cut into materials of appropriate size and thickness and then put into a mold. It is molded under a certain temperature of a pressure molding machine; The raw material of liquid silicone molding process is injection molding liquid silicone rubber, and the curing equipment is injection molding machine.   The shape of Bing Dwen Dwen's ice shell is inspired by "sugar gourd". In actual production, silica gel material is used. The silica gel shell of "Bing Dwen Dwen" is large in size, which is different from other small products. The first mock examination can produce dozens of products. A set of "Bing Dwen Dwen" molds can only produce two silica gel shells at a time.   In addition, the manufacturing process of the shell of Bing Dwen Dwen is complex, and the requirements for fineness and cleanliness are also high. First, the mold must be cleaned and swabbed, then polished, and then the silica gel is placed on the mold and sent to the machine for molding. The demoulding process should be very fine, without any damage. After the completion, the Olympic rings and rainbow bars will be integrated into the products, and lovely Bing Dwen Dwen will be born in this way.  

The multi-color and multi material injection molding technology of hard glue and hard glue, hard glue and soft glue is introduced in detail   1、 Introduction to multi-color / multi material injection molding technology Also known as multi-color injection molding process, it refers to the injection molding of two or more colors of materials or different materials through a mold with one or more channels. The first is represented by two-color injection molding, and our daily contact is also dominated by two-color products. For example, the handle of the toothbrush we use every morning and evening adopts two-color injection molding. The commonly used material of the handle is PP (hard glue) +tpe (soft glue). TPE is the best material to blend with PP glue, and the coating of soft glue is to improve the grip. With the increasing complexity of products, the demand for three or even four colors begins to emerge. Generally speaking, there are two types of tricolor machine, one is two position tricolor machine (commonly known as false tricolor), and the other is three position tricolor machine (commonly known as true tricolor). In fact, the difference between the two is not "true or false", but different turntable control methods according to the product structure design (two molds or three molds). "Two stations" as the name suggests, the rotary table is rotated and positioned in two positions, which is equivalent to the 180 degree rotary table control mode of the two-color machine. In other words, in the three groups of injection molding units of the two station three color machine, two groups are injected into the same mold at the same time. Therefore, if the boundary of two components in the product is not adjacent (it can be designed to inject in the same mold at the same time), only two molds are needed to produce three component products, then the two station three color machine is applicable. "Three stations" is different. The rotation of the turntable can be positioned at three positions (120 degrees). In other words, the three groups of injection molding units of the three position three color machine are injected into three molds respectively. Therefore, if the boundaries of the three components in the product are adjacent, the three position three color machine is applicable. Similarly, four-color machines can also be divided into "two station" and "multi station" four-color machines. From a technical point of view, the control accuracy of multi station turntable is significantly higher than that of two stations, so the production cost of the machine is also relatively high. Therefore, we should choose the most effective scheme according to the needs of product structure.     2. Working principle of two-color mold The two-color mold usually has two sets of molds, half of which are installed on the fixed mold fixing plate of the two-color injection molding machine, that is, the side with the injection gate, and the other half is i...

Liquid silicone is widely used in the fields of electronics,machinery,medical treatment,automobile,etc. the research progress of addition liquid silicone rubber is introduced in this paper   Abstract: the advantages and applications of addition liquid silicone rubber were briefly described. By summarizing the main components of additive liquid silicone rubber, several additives used to modify the properties of additive liquid silicone rubber were introduced: adhesive additives, conductive additives, thermal conductive additives, flame retardants and special functional additives. The factors influencing the functionality of addition liquid silicone rubber were summarized. The new direction of addition curing liquid silicone rubber was introduced. Finally, the future research direction of addition liquid silicone rubber was prospected.   Key words: addition molding, liquid silicone rubber, composition, function, additive   1、 Overview of addition liquid silicone rubber The addition liquid silicone rubber is a kind of silicone material which can be crosslinked and vulcanized at room temperature or under heating in the presence of platinum catalyst, with polyorganosiloxane containing vinyl as the basic polymer and polyorganosiloxane containing Si-H bond as the crosslinking agent. Different from condensation type liquid silicone rubber, addition type liquid silicone rubber has no by-products during vulcanization, small shrinkage, deep vulcanization and no corrosion to contact materials. It has the advantages of wide applicable temperature range, excellent chemical resistance and weather resistance, and can be easily adhered to various surfaces. Therefore, compared with condensation type liquid silicone rubber, addition type liquid silicone rubber develops rapidly. At present, it has been more and more widely used in electronic and electrical appliances, machinery, construction, medical treatment, automobile and other fields.     2、 Main components of addition liquid silicone rubber   1. Basic polymer The basic polymers used as additive liquid silicone rubber mainly include the following two kinds of linear polysiloxane containing vinyl. Their molecular weight distribution is wide, generally from thousands to 100000 to 200000. The most commonly used basic polymer for addition liquid silicone rubber is α,ω- Divinylpolydimethylsiloxane. It is found that the molecular weight and vinyl content of the basic polymer can change the properties of liquid silicone rubber.   2. Crosslinking agent The crosslinking agent used for addition liquid silicone rubber is organic polysiloxane with more than 3 Si-H bonds in the molecule, such as linear methyl hydrogen polysiloxane containing Si-H group, cyclic methyl hydrogen polysiloxane and MQ resin containing Si-H group. The most commonly used are linear methyl hydrogen polysiloxanes with the following structures. It is found that the mechanical properties of silicone rubber...

Where can silicone rubber products be used Silicone rubber not only has the advantages of non-toxic, high and low temperature resistance, but also has high plasticity. Today's silicone products are widely used in all walks of life, which brings us a lot of convenience. Therefore, the silica gel industry is in a period of rapid development. Understanding the relevant knowledge of silica gel products has become a compulsory course for many bosses and purchasers. Where can silicone rubber products be used     1、 Industry and manufacturing Silicone rubber has high plasticity. All kinds of industrial accessories can be mass produced through mold opening and customization. It is high in quality and low in price, and can meet various unique customization needs.   2、 Electronic accessories Most electronic keys will be made of silicone rubber, which is because the silicone rubber keys have the advantages of wear-resistant and good hand feeling, and the subsequent processing technologies such as radium carving and silk screen printing have been mature. In addition to the above advantages, silicone rubber can also achieve electromagnetic shielding, so silicone rubber will be used for wire, cable and microwave shielding.   3、 Protective sleeve, shell Silicone rubber is soft in texture and has certain anti falling protection function. Mobile phone protective cover and silicone rubber shell of instruments and equipment are common silicone rubber products.   4、 Dustproof and waterproof sealing Silicone rubber seals have good dustproof and waterproof performance, which can not only meet daily life and industrial production, but also occupy a place in aerospace, deep diving and other fields. It is no exaggeration to say that silicone rubber seals can go to the world.   5、 Food, daily use Silicone rubber is harmless to human body and can pass various food tests, so silicone rubber products begin to appear in our kitchen and living room, and will become more and more necessary products for our life in the future. Amazon Whiskey Cocktail Ball Round Sphere Ice Cube Mold   6、 Medical and health care Silicone rubber has unique physiological inertia and will not have adverse reactions with the human body. It can be used in the medical and health industry. The common ones are medical hose, respiratory mask and so on. Silicone rubber is also used in some sports health care products, such as fascia gun, cleanser and eye massage instrument.

Silicone tableware customization manufacturers introduce the differences and common applications between food grade silicone and general silicone   With more and more attention paid to food safety and the epidemic has greatly changed people's eating habits, there are more and more silicone environmental protection tableware bags to replace disposable plastic products. Although we have constantly emphasized the non-toxic and safe characteristics of silicone in the previous articles, we will still use different ingredients according to specific product uses and relevant certification procedures. Today, let's talk about the difference between food grade silicone and ordinary silicone, and how to distinguish whether silicone is food grade or not.     What is food grade silicone? Is food grade silicone edible? Of course not! Once again, we emphasize the concept that silicone is indeed a safe, non-toxic and harmless raw material for human body. Even so, it can be divided into food grade and ordinary grade. Food grade silicone generally refers to all products that will come into contact with our diet, such as baby pacifiers, straws, food containers, tableware and so on. Ordinary grade silicone is generally used for industrial purposes and cannot be used in this kind of food related products.     Differences between food grade silicone and ordinary silicone Manufacturing method and procedure Imported raw materials are generally used for food grade silicone, and the quality has been determined at the beginning of raw material selection. Therefore, relevant quality inspection reports are indispensable when purchasing raw materials. This is not to say that the quality of ordinary silicone is not good, but that there are different application fields between the two. Ordinary silicone products are produced by mixing ordinary silicone, while food grade products with high quality requirements are made of food grade vapor phase adhesive. We know that silica is one of the main components of silicone, and the purity density of fumed silica is higher than that of ordinary silica, so it will be different in the finished products. However, the difference between the two is not big, mainly in the tensile strength. Food grade silicone has reinforcing effect on tensile properties, so there will be no whitening in the tensile process. Therefore, it is from this point that we want to preliminarily identify whether silicone products are food grade.     Component silicone for food is an inorganic polymer colloidal material made by polycondensation of silicic acid. It is non-toxic, tasteless and has stable chemical properties. Under normal conditions, it does not react with any acid, alkali or salt except caustic soda and hydrofluoric acid. It can withstand the high temperature of 220 ℃, so it can be put into the microwave oven and has no effect on the human body. Compared with other materials, it is safer and healthier. Food grade silicone...