China Xiamen Juguangli Import & Export Co., Ltd Company News

With the improvement of modern living standards, people's requirements for daily tools, supplies, and materials are gradually increasing, such as environmental protection and safety, food grade, non-toxic and odorless, and so on. Food grade silicone materials are widely used in various fields, such as mother and baby products, children's toys, adult products, food molds, precision products, silicone products, potting and sealing, special printing, etc. Because food grade silicone is a synthetic material, it has undergone technological advancements and improvements. The food grade silicone products produced by food silicone manufacturer Kexin Silicone have weather resistance, aging resistance, low temperature resistance of -65 ° C, instant temperature resistance of 400 ° C, and certain acid alkali and corrosion resistance, which depends on the concentration of acid and alkali. Silicone does not produce harmful radiation during the process from liquid to solidification.

What are the major categories of molds in terms of molding? Molds are mainly divided into injection molding, compression molding, extrusion molding, injection molding, and hollow molding in terms of molding. In addition, there are foam plastic molding molds, glass fiber reinforced plastics, low-pressure molding molds, etc.   1. Injection molding First, add the plastic into the heating cylinder of the injection machine. The plastic is heated and melted, and under the push of the injection machine screw or plunger, it enters the mold cavity through the nozzle and mold pouring system. Due to physical and chemical effects, it hardens and shapes into injection molded products. Injection molding consists of a cyclic cycle consisting of injection, pressure holding (cooling), and plastic part demolding processes, thus injection molding has the characteristic of periodicity. Thermoplastic injection molding has a short molding cycle, high production efficiency, and minimal wear of the mold caused by the melt. It can produce large quantities of plastic parts with complex shapes, clear surface patterns and markings, and high dimensional accuracy; However, for plastic parts with large variations in wall thickness, it is difficult to avoid molding defects. The anisotropy of plastic parts is also one of the quality issues, and all possible measures should be taken to minimize it as much as possible. 2. Compression molding Commonly known as compression molding, compression molding, and compression molding, it is one of the earliest methods of forming plastic parts. Compression molding is the process of directly adding plastic into an open mold cavity at a certain temperature, then closing the mold and melting the plastic into a flowing state under the action of heat and pressure. Due to physical and chemical processes, plastic hardens into a shape and size that remains unchanged at room temperature. 3. Extrusion molding It is a molding method in which materials in a viscous flow state are molded into continuous profiles with the desired cross-sectional shape at a lower temperature through a die with a specific cross-sectional shape under high temperature and certain pressure. The production process of extrusion molding involves preparing molding materials, extruding shapes, cooling and shaping, pulling and cutting, and post-processing of extruded products (quenching or heat treatment). During the extrusion molding process, pay attention to adjusting the temperature, screw speed, traction speed, and other process parameters of each heating section of the extruder barrel and the die head in order to obtain qualified extruded profiles. Special attention should be paid to adjusting the extrusion rate of polymer melt from the die of the machine head. Because when the extrusion rate of molten material is low, the extruded material has a smooth surface and uniform cross-sectional shape; But when the extrusion rate of the molten material reaches a certain limit, the surface of the extruded material will become rough, lose luster, and exhibit phenomena such as shark skin, orange peel patterns, and shape distortion. As the extrusion rate further increases, the surface of the extruded material undergoes distortion, and may even detach and fracture into molten fragments or cylinders. Therefore, controlling the extrusion rate is crucial. 4. Injection molding Also known as casting and pressing molding. It is to add plastic raw materials into the preheated feeding chamber, then place the pressure column into the feeding chamber to lock the mold, and apply pressure to the plastic through the pressure column. The plastic melts into a flowing state under high temperature and pressure, and gradually solidifies into plastic parts through the pouring system into the mold cavity. This molding method is also known as transfer molding. Pressure injection molding is suitable for plastics that are lower than solid plastics and can be compressed and molded in principle. Pressure injection molding can also be used. But it is required that the formed material has good flowability in the molten state below the solidification temperature, and a larger solidification rate above the solidification temperature.

Regarding the hardness range of silicone products. Most silicone products use silicone rubber compound, and the molding process is mostly hydraulic molding. The lower the hardness, the more unfavorable the product is for material placement, and the more bubbles will be generated during high-temperature vulcanization due to its semi fluid internal structure. Therefore, we have very high requirements for selecting silicone materials for such products, and we must also use the best vulcanizing agent by increasing the power of the vacuum machine and improving the mold structure to solve the problem. Silicone products have good toughness and elasticity, and are not easily deformed by external forces. There is a layer of oily substance on the surface layer, so it feels smooth to the touch. It is mainly used in industries such as construction machinery, automobiles, electronic products, household appliances, toys, medical care, sports equipment, etc. It has the functions of shock absorption, sealing, anti-static, high and low temperature resistance, wear resistance, flame retardancy, acid and alkali corrosion resistance, etc.   The adsorption function of silica gel is mainly physical adsorption, which can be regenerated and reused. Add acid to alkali metal silicate (such as sodium silicate) solution to acidify it, and then add a certain amount of electrolyte for stirring to generate silicic acid gel. In general, the hardness of silicone products is 30-80 °, which is also a common silicone hardness and suitable for the production of most silicone products. Let's take silicone tubing as an example: Silicone tubing, also known as silicone tubing. Used as a carrier for the circulation and encapsulation of liquids, gases, and other materials. Hardness: 70 ± 5, tensile strength: ≥ 6.5

1. Whether the self-healing edge of the product feels rough or not, the size of the mold closing line determines the workmanship of the product mold, and the mold workmanship determines the overall effect of the product. Self healing is very important! 2. The vulcanization effect of the product and the uneven hardness and softness of the product feel; Poor stretch resilience and rebound effect; It is related to the manufacturer's vulcanization time and the issue of raw materials. 3. The color and odor of silicone products depend on the uniformity of the manufacturer's mixing process. The longer the time, the better the color saturation. 4. Silicone raw materials are non-toxic and odorless, but when sulfurizing agents are added to the raw materials and subjected to high-temperature hydraulic molding by silicone manufacturers, a glue smell may appear. However, after secondary sulfurization and prolonged storage, it will gradually disappear! So having no odor is normal! 5. When choosing silicone products, we first look at the color. High quality colors are more vibrant, with a smooth surface that feels good when touched by friends; Poor quality silicone products feel rough to the touch and have a cloudy color. 6. Smell the odor. When smelling silicone products, there may be a slight odor due to residual sulfurizing agents, but this is normal. Generally, after being left in the air for a few days, the odor will be completely eliminated; Poor quality silicone products have a foul odor and a pungent smell. 7. In terms of usage, good silicone products are not easily deformed or twisted when pulled, have elasticity, and have bright colors:; Poor quality silicone products are prone to fading, deformation, and insufficient explosion resistance, making them easy to age. 8. Wear resistance is the ability of silicone products to withstand wear and tear during production and molding. Good silicone products generally have a surface that is rarely rubbed off by external factors, and does not affect the appearance, appearance, or color of the product. And the surface characters of low-quality silicone products are prone to falling off. 9. Elasticity, silicone products have good elasticity because high elasticity mainly comes from the movement of silicone molecular segments. Therefore, when purchasing silicone products, first check the elasticity of the silicone product to determine its quality. 10. Fatigue resistance: The phenomenon in which the structure and properties of silicone products change when subjected to alternating stress (or strain) is called fatigue. The phenomenon of damage to silicone products during the fatigue process is called fatigue failure. So fatigue resistance is also a method of identifying the quality of silicone products. 11. Hardness and tensile stress are important indicators of the rigidity (stiffness) of silicone materials, which are the forces required for silicone products to undergo certain deformations. It is also a method of identifying the quality of silicone products. 12. In terms of characteristic and tactile feel, silicone products have good toughness and elasticity, and are not easily deformed by external forces. Moreover, the tactile feel is relatively smooth, while counterfeit silicone products are prone to deformation and feel rough. 13. In terms of characteristics, silicone products are non-toxic, odorless, colorless, with good texture and no harm to the human body. However, it is difficult for counterfeit silicone products to achieve these effects. Counterfeit silicone products are generally toxic, have a pungent odor, and are also relatively rough! 14. At the same time, it is also very useful to judge the authenticity of silicone products through the convenience of flame combustion. Counterfeit silicone products have excellent smoke residue as black powder when burned, while real silicone products emit white smoke and white powder residue no matter what color they are burned.

I believe most customers who have used O-rings have experienced deformation of O-rings. O-ring is a common silicone rubber product that is widely used and the production process is not difficult. The selection of purpose, material, and size may also vary. One thing that can be confirmed is that the majority of O-ring damage does not come from the design and pressure of the O-ring. If the design only unilaterally increases the pressure, it is impossible to cause damage to the O-ring seal. By exploring the reasons, we will find that if the working environment is high temperature and pressure, it may cause deformation of the O-ring seal or bite when it is squeezed into the gap. The typical sealing effect of O-ring deformation caused by compression is that it will generate contact pressure with the sealing surface during installation. When the pressure exceeds the pressure of the sealing medium, the sealing effect will occur, and vice versa, leakage will occur.   Here are some reasons that can cause O-ring deformation: 1. Compression and tension 2. Temperature 3. Medium working pressure So how can we better and effectively avoid O-ring deformation 1. When choosing O-rings, the friction coefficient should be low and lubrication should be done properly. 2. The contact surface should be smooth, without roughness or stains; 3. When installing, ensure coaxiality, avoid excessive eccentricity, and ensure the rationality of the sealing system to prevent excessive dimensional errors

The hardness of silicone products is an important physical parameter in the production of silicone products, which involves the final performance and application of silicone products. So, what is the general hardness range of silicone products? The hardness range of silicone is very wide, and the hardness of silicone is generally measured by a Shore hardness tester, ranging from 10 degrees to 80 degrees.   In general, the higher the hardness of silicone, the more wear-resistant and compressive it is, but the elasticity will correspondingly decrease. On the contrary, silicone with lower hardness has a soft and comfortable feel, and has good elasticity. The difference in hardness between liquid silicone and solid silicone: Liquid silicone typically has lower hardness and is suitable for applications that require flexibility and fluidity. Solid silicone has higher hardness and is more suitable for making durable finished products. Application areas of silicone products with different hardness: The difference in hardness brings about significant differences in the application scenarios and fields of silicone products: for example, low hardness silicone is commonly used in medical equipment and baby products to provide a soft and comfortable touch; High hardness silicone is commonly used in the automotive and electronics industries to manufacture various seals and protective components. The hardness of commonly used silicone products: In daily life, many silicone products have clear hardness requirements. For example, kitchen appliances such as silicone spatulas usually require a certain degree of hardness to ensure durability; And protective cases like phone cases require moderate hardness to provide good protection. The hardness range of silicone is 10 degrees to 80 degrees, and the hardness values within this range can meet the majority of silicone applications. When choosing silicone products, factors such as hardness, temperature tolerance, chemical stability, and processing methods should be comprehensively considered to ensure that the product can perform well in specific usage environments.

Performance Table of O-ring Material O-ring is a commonly used sealing component, widely used in mechanical, automotive, aviation and other fields. Different application scenarios require the selection of different materials.   1. Fluororubber (FKM) Fluororubber has excellent oil resistance, heat resistance, and chemical corrosion resistance, making it suitable for sealing requirements in harsh environments such as high temperature, high pressure, and high speed. But the price is high and not suitable for low-cost applications. 2. Nitrile rubber (NBR) Nitrile rubber is a commonly used universal sealing material with good oil resistance, wear resistance, and aging resistance, suitable for sealing requirements at low temperatures, low pressures, and low speeds. But it is prone to hardening and aging in high temperature and high pressure environments. 3. chloroprene rubber (CR) Chloroprene rubber has good oil resistance, cold resistance, and weather resistance, and is suitable for sealing requirements at low temperatures, low pressures, and low speeds. But it is prone to aging in high temperature and high pressure environments. 4. Butyl rubber (BR) Butyl rubber has good elasticity and wear resistance, suitable for sealing requirements at low temperatures, low pressures, and low speeds. It may soften during high temperatures. 5. Ethylene propylene rubber (EPDM) Ethylene propylene rubber has excellent oxidation resistance, ozone resistance, and weather resistance, making it suitable for sealing requirements in outdoor environments. But it is prone to hardening in high temperature and high pressure environments.   The above are common O-ring materials and their characteristics. Choosing the appropriate material can improve the sealing effect and service life. If you are interested in or have any questions about the above O-rings, please click to contact us.

Aging is not fast: Unlike some sealing materials, rubber will gradually age naturally under pressure and reduce elasticity under any stress conditions. So seals actually have a certain service life, which is closely related to the quality of the sealing material. Due to the small pre compression amount after installation, the aging rate of the seal will be relatively slower. Good stability: determined by the shape and characteristics of the rectangular seal, it will not twist after installation; The deformation after pre compression is small; When the hydraulic pressure changes, the shaping is also relatively small. The cross-sectional stability of the seals is good. Good sealing performance: When using O-ring seals as end face seals, a "suction back effect" will occur when there are large pressure pulses. The first effect is generated by the pressure between the low-pressure side of the O-ring seal and the groove side in the groove. When pressure shock occurs, the fluid is discharged as the O-ring seal moves. When the pressure drops, a slight leakage similar to sweating occurs. When using rectangular seals, due to their geometric characteristics, there will be no sweating issues. Strong anti extrusion performance: When using O-ring seals, under frequent or long-term pressure shocks, over time, a small amount of sealing material will be sheared and extruded from the low-pressure side gap. This phenomenon is called "extrusion damage". Under the same operating conditions, if rectangular seals are used, there will be no "extrusion damage". High sealing pressure: The working pressure of O-ring seals is 32MPa, and the working pressure of rectangular seals is 50MPa. When O-ring seals are used for radial sealing and the pressure exceeds 10MPa, a retaining ring needs to be added on the low-pressure side to prevent damage caused by extrusion. When using rectangular seals, there is no need to set up a retaining ring.  

How to choose the appropriate material for customizing silicone products? In the field of silicone product customization, material selection is a key factor determining product quality and performance. The appropriate silicone material not only meets the functional requirements of the product, but also ensures safety and comfort during use.   Silicone materials can be roughly divided into the following categories based on their properties and applications: 1. Divided by performance Ordinary silicone: It is the most common silicone material with excellent weather resistance, high temperature resistance, corrosion resistance, and other characteristics. Suitable for general industrial products such as seals, buttons, etc., with relatively low cost, but not suitable for direct contact with food or medical use. Food grade silicone: Complies with international food safety standards such as FDA and LFGB, is non-toxic and harmless, and can be used to make silicone products that come into direct contact with food such as tableware, kitchenware, and baby pacifiers. Stable within the range of -20 ℃ to 200 ℃, it can withstand high temperature steaming and disinfection, as well as be used for frozen dough operations. It achieves a 99.9% antibacterial rate through physical adsorption and can inhibit mold growth without the need for chemical coatings. Medical grade silicone: It has higher requirements than food grade silicone and requires medical grade certification such as ISO10993. It is used for the production of medical devices, human implants, etc. It has strict requirements for biocompatibility and sterility. High strength silicone: It has high tensile strength and wear resistance, and can withstand high pressure and friction. It is suitable for silicone products that can withstand high pressure and friction, such as industrial products, sports equipment, etc. Special performance silicone: designed according to specific requirements, such as conductive silicone used for sealing and conductive connections in electronic products, and flame-retardant silicone used for occasions requiring fire safety. Divided by physical state Solid silicone: mainly used for molded products, such as silicone sleeves, silicone tableware, silicone buttons, etc. Shaped by mechanical high-temperature extrusion, generally divided into silicone strips, silicone tubes, etc., with a hardness of around -10 degrees to 40 degrees. Liquid silicone: mainly used for extruded products such as silicone nipples, silicone tubes, etc. Its material is relatively soft and mainly used in medical technology, human organs, and other fields.   2. Basis for selecting silicone material When choosing silicone material, the following factors need to be considered comprehensively: Application scenarios Temperature resistance range: Select the appropriate silicone type based on the temperature range of the product's usage environment. For example, products working in high-temperature environments should use high-temperature resistant silicone gel; For products used in frozen environments, it is necessary to choose silicone materials that can maintain good elasticity at low temperatures. Contact medium: If the product needs to come into direct contact with food, drugs, or the human body, food grade or medical grade silicone must be selected to ensure the safety and non toxicity of the product. Physical properties: Select the appropriate silicone formula based on the physical properties requirements such as hardness, tensile strength, and tear strength of the product. For example, for products that require significant pressure and friction, high-strength silicone should be chosen; For products that require a soft touch and good elasticity, low hardness silicone can be chosen. Special performance: If special properties such as conductivity, flame retardancy, and anti-static are required, corresponding special performance silicone gel should be selected. Product characteristics Dimensional accuracy: The dimensional accuracy of silicone products is very important and must be accurately measured and customized according to the actual size of the product. Sizes that are too large or too small can cause silicone products to not fit tightly to the product, affecting their effectiveness. Therefore, when choosing silicone material, its processing performance and dimensional stability need to be considered. Thickness and hardness: The thickness and hardness of silicone products should be selected based on the characteristics and usage requirements of the product. Thin silicone products may not provide sufficient protection, while thick silicone products may affect the tactile feel of the product. In terms of hardness, silicone products that are too soft may be prone to deformation, while silicone products that are too hard may not be comfortable enough. Cost and Environmental Protection Cost control: Reasonably control costs and avoid unnecessary waste while ensuring product quality. The price of silicone varies greatly among different materials, and it is necessary to choose the appropriate material based on the product budget and market demand. Environmental friendliness: Ensure that the silicone material used complies with relevant environmental standards and does not contain harmful substances. With the increasing attention of consumers to environmental issues, choosing environmentally friendly silicone materials has become a trend.   3. Material selection for common application scenarios Food contact field In the field of food contact, such as making tableware, kitchenware, baby pacifiers, etc., food grade silicone must be used. This type of silicone meets strict food safety standards, ensuring that it does not release harmful substances that pose a threat to human health during long-term use. For example, some high-end food grade silicone pad panels use platinum silicone or liquid silicone, with a silicon dioxide content of over 98%, which remains stable in the range of -20 ℃ to 200 ℃. They can withstand high temperature steaming and disinfection, as well as be used for frozen dough operations. Medical field In the medical field, such as the production of medical devices, human implants, etc., medical grade silicone should be used. Medical grade silicone has extremely high biocompatibility and non toxicity, which can meet the high standard requirements in the medical field. The production process requires strict testing and certification to ensure the safety and reliability of the product. Industrial sector In the industrial field, such as making seals, pipelines, etc., ordinary silicone or high-strength silicone can be selected according to specific usage environments and requirements. Ordinary silicone has stable performance, relatively low price, and is suitable for general industrial environments; High strength silicone has high tensile strength and wear resistance, and can withstand significant pressure and friction, making it suitable for industrial scenarios that require high product performance. In the field of electronic products In the field of electronic products, such as making sealing and conductive connecting components for electronic products, conductive silicone can be used. Conductive silicone has good conductivity and sealing performance, which can effectively protect electronic products from external environmental interference and damage.   Choosing the appropriate silicone product material for customization is a process that comprehensively considers various factors such as application scenarios, performance requirements, and cost budgets. By deeply understanding the basic characteristics and material classification of silicone, combined with specific application scenarios and product features, making scientific and reasonable choices can not only enhance the market competitiveness of the product, but also better ensure the safety and experience of users.

The role of desiccants can be seen everywhere in daily life, and their presence can be seen in almost any new product packaging. Although we have seen the widespread use of silicone desiccants, how long can they be stored, and can long-term storage really prevent moisture and mold? Will there really be no expiration phenomenon?   Firstly, we understand that since desiccants are designed to prevent moisture and mold, the material must have high activity adsorption capacity, a certain degree of acid-base reaction, slow aging rate, insolubility, strong chemical stability, and other advantages in order to be stored for a long time. Silicone materials belong to high activity adsorption materials, which cannot tolerate any substances and have strong adsorption capacity. They mainly adsorb water vapor by adsorption method. Silicone materials have strong stability and can be stored for a long time without any aging or deterioration phenomenon, so their effectiveness and lifespan as desiccants are completely stable. In the service life of silica gel desiccant, experimental methods can be adopted. If it can be stored for a long time in a dry and liquid free environment and has a certain moisture-proof and mildew proof effect, if it is used in a high humidity and severe ozone environment, the service life will be reduced. In the case of water seepage, it can be used for about 1 year. If it does not leak water, it can be used for a long time. Its service life is determined by the environment, but it can be used for a long time if it is stored normally. The use of desiccants is widely used in various industries, and this type of auxiliary material has also made desiccant materials a category of production conversion in the manufacturing industry. Desiccant materials can also be divided into many types, including mineral desiccants, fiber desiccants, quicklime materials, montmorillonite desiccants, activated alumina, and silica gel desiccants. Currently, silica gel desiccants are one of the most commonly used types, and they are basically stationary items that no one can move at will. They can still achieve good results in moisture and mold prevention!