TPE/TPU Material Knowledge_TPE,TPU raw material manufacturer-Guangdong SPP New Material Co., Ltd.

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What can 0 degree TPE material do?

0 degrees TPE material refers to (hardness unit Shore A), TPE material refers to SEBS-based blend of modified thermoplastic elastomer materials. These days I have a customer is into adult products, he took a super soft TPE material adult toys and I said I want this effect, the first feel should be good, the feel must meet the best requirements of human touch, the second requirement is the softness of the hardness on the basis of his material on OK it, no change. Then I took two materials to test material, one is we say 5 0 TPE super soft material, one is 8 0 super soft material, to meet the customer's requirements for super soft this.

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TPE pellets] Prepare before use to avoid waste

Thermoplastic elastomer TPE pellets are a common injection molding material. In order to ensure the quality of the finished product, it is important to make adequate preparations before injection molding of TPE thermoplastic elastomer to prevent the occurrence of different situations from the test. (In fact, the main purpose is to avoid waste and to avoid various situations of injection molding). Whenever I see our customers clearing the machine with the TPE pellets we have produced, I especially want to say, stop, do not waste ah, I give you the material regardless of the price that is absolutely more than the price of PP, why do not you use PP clearing machine? In fact, it is also because some customers really do not use PP or did not think about this aspect of the situation, I will bring 2kg PP to help customers clear the machine to avoid waste.

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tpe/tpr plastic material dual material applications

tpe/tpr plastic material dual material applications 　　Due to the popularity of the majority of consumers, the application of dual materials in recent years has formed a major trend, the application range is extremely wide, from toothbrush handle, comb handle, cleaning brush handle, knife handle, scissor handle and other daily necessities to flashlight handle, hair dryer handle, iron handle, electric toothbrush and other small household appliances, manufacturers are always trying to add a layer of TPE, so that the product more diversified. The market is expanding and its applications will become more widespread. 　　Generally speaking, TPE dual material injection molding can produce the following functions in product design. 　　1. To make the product surface with a soft and comfortable feeling 　　2. Make the product with anti-slip function 　　3. Improve the impact resistance of products 　　4. Increase the added value of old products and enhance the product grade 　　5. Processing method 　　1. Multiple Material Molding (MMM) 　　Multiple Material Molding (MMM) is processed by multi-material injection molding machine (commonly known as two-color machine), which is generally divided into two different designs, such as right angle injection table arrangement and balanced injection table arrangement. The right-angle two-color machine can be matched with a variety of two-color mold operation methods, such as: turntable type, core rotation, mold core sinking, live door separation, mold core sliding, etc. Two (or more) kinds of plastics are injected into different mold cavities at the same time to achieve the effect of multi-color or multi-material. 　　Its advantages are briefly as follows. 　　1. Short production cycle and higher output than traditional methods 　　2. Stable product quality and low scrap rate. 　　3. Stronger material bonding force and less defects on the bonding surface. 　　4. It is possible to manufacture more complex design of two-material products. 　　2. Insert Molding 　　Insert Molding is also known as the two-step method. This method is performed on a conventional or upright injection molding machine. This method requires two sets of molds and two injection molding machines. The pre-made hard plastic parts are fixed in the mold cavity of the second set of molds in the form of inserts, and then the TPE is injected into the hard plastic parts to achieve the effect of multi-color and multi-material. 　　Soft and hard material combination 　　In the application of dual material co-molding, different hard plastics are used for different products, such as PP for brushes, and ABS, PC or PA (nylon) for home appliances. Because the characteristics of each specification or variety of TPE are different, and a single specification of TPE can not have good bonding ability with every kind of hard plastic, so in the soft and different hard materials, it is necessary to cooperate with different specifications of TPE, in order to achieve the best bonding effect. 　　What kind of adhesive can be co-molded with TPE? 　　PP, PE 　　ABS, PC, ABS/PC Alloy 　　PA66, PA+GF 　　SAN, K-RESIN, PS, HIPS, PMMA

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TPE/TPR plastic material processing knowledge

　TPE/TPR processing small knowledge 　　TPE, TPR in storage will absorb moisture in the air, it is generally recommended to dry, raw materials can be blast heated hopper, baked at 70-80 degrees for 2 - 4 hours. Materials bonded with ABS, AS, PS, PC, PA, etc. need to be pre-baked at 90-100 degrees for 2-4 hours. 　　Mold temperature: SBS system: 10 --- 40 degrees; SEBS system: 35 --- 65 degrees. 　　Injection speed. 　　SBS system: medium injection speed is preferred. 　　SEBS system: higher injection speed is appropriate. 　　If the mold has sufficient exhaust system, there is no need to worry about trapped air even at high injection speed. 　　Barrel cleaning. 　　SBS system has good thermal stability and does not need to be cleaned up after each raw material interruption; SEBS system has better thermal stability and will not degrade even if parked for 2 hours at processing temperature. 　　SBS system can be used PS to clean up the barrel; SEBS system is best to PE, PP to clean up the barrel. 　　Coloring: TPE, TPR is relatively easy to color, but should choose the appropriate color powder or color masterbatch coloring. 　　SBS system: color masterbatch with PS or EVA as the bottom is more suitable. 　　SEBS system: color masterbatch with PE or PP as the base is more suitable. 　　Note: Color masterbatch with PVC as the base should not be used.

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Application of TPE/TPR thermoplastic elastomer in the market

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Analysis of the causes and countermeasures of fusion joint marks during TPE/TPR molding

1.What is fusion mark 　　When the TPE melt fills the cavity, if two or more strands of melt have cooled at the front part when they meet, so that they cannot be completely fused, a linear groove is produced at the confluence, forming a fusion mark. 　　2. Analysis of the causes of fusion marks and countermeasures 　　2.1. Material temperature is too low. 　　Low-temperature melt material has poor divergence and convergence performance, easy to form fusion marks. If the TPE material inside and outside the surface in the same part of the fusion fine lines, often due to the material temperature is too low caused by poor fusion. In this regard, the barrel and nozzle temperature can be properly increased, or extend the injection cycle to promote the material temperature rise. At the same time, the amount of coolant passed through the mold should be restrained to properly increase the temperature of the mold. In general, the strength of the TPE material fusion marks is poor, if the corresponding part of the mold fusion marks for local heating, improve the local temperature of the fusion parts of the molding parts, often improve the strength of the TPE|TPR plastic fusion parts. If, due to special needs, low-temperature molding process must be used, the injection speed and injection pressure can be appropriately increased, so as to improve the melt convergence properties. Can also be appropriate in the raw material formula with a small amount of additional lubricants to improve the fluidity of the melt. 　　2.2. Mold defects. 　　Try to use the gate form with less diversion and choose the gate position reasonably. Choose the gate position to avoid inconsistent filling rate and interruption of the mold flow. If possible, a little bit of glue should be used. In order to prevent the low temperature melt from being injected into the mold cavity to produce fusion marks, the mold temperature can be increased at the same time, set up cooling cavities in the mold. 　　2.3. Poor mold exhaust. 　　First of all, you should check whether the mold exhaust hole is blocked by the melt curing or other objects, and whether there are foreign objects at the gate. If there is still charring point after the blockage is cleared, the exhaust hole should be increased at the sink point of the mold, or by repositioning the gate, or by appropriately reducing the closing force and increasing the exhaust gap to speed up the sink flow. In terms of process operation, we can also take auxiliary measures such as reducing the material temperature and mold temperature, shortening the high-pressure injection time and reducing the injection pressure. 　　2.4. Improper use of mold release agent. 　　In the injection molding, generally only in the threads and other parts that are not easy to release the mold evenly coated with a small amount of release agent, in principle, the amount of release agent should be reduced as much as possible. 　　2.5 TPE material structure design is not reasonable. 　　If the wall thickness of TPE plastic parts designed too thin or thin thickness disparity and too many inserts, will cause poor fusion. When designing the structure of the plastic part, it should be ensured that the thinnest part of the plastic part must be greater than the minimum wall thickness allowed during molding. In addition, the use of inserts should be minimized and the wall thickness as much as possible to the same. 　　2.6. The fusion angle is too small. 　　Different rubber and plastic materials have their own extreme fusion angle. Two streams of material converge if the convergence angle is less than the ultimate fusion angle, there will be fusion marks, if greater than the ultimate fusion angle, fusion marks will disappear. The ultimate fusion angle value is generally around 135 degrees. 　　2.7. Other reasons. 　　When the use of raw materials, moisture or volatile content is too high, the mold in the oil stains are not clean, the mold cavity with cold material or melt within the fiber filler distribution is poor, mold cooling system design is unreasonable, the melt curing too fast, the temperature of the insert is too low, the nozzle hole is too small, the injector plasticizing ability is not enough, the plunger or injector barrel pressure loss, can lead to different degrees of bad fusion. 　　In this regard, in the operation process, should be taken for different situations, respectively, pre-drying of raw materials, regular cleaning of the mold, change the mold cooling water channel design, control the flow of cooling water, improve the temperature of the insert, change to a larger aperture nozzle, change to a larger size injection machine and other measures to be resolved. 　　The melt marks, in addition to causing the appearance of the parts, but also may lead to insufficient strength of the parts, easy to fracture, etc..

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Analysis of injection molding temperature and shrinkage rate of tpe/tpr products

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TPE/TPR material injection molding color problem analysis

Color difference is a common defect in injection molding, and it is not uncommon to see batch scrapping of injection molding machine due to color difference of matching parts. There are many factors affecting color difference, including raw material resin, color masterbatch, mixing of color masterbatch and raw material, injection molding process, injection molding machine, mold, etc. Because of the wide range of factors involved, color difference control technology is also one of the more difficult technologies to master in injection molding. In the actual production process, we generally control the color difference from the following six aspects. 　　1. Eliminate the influence of injection molding machine and mold factors 　　To choose the injection molding machine with the same capacity as the main product, if the injection molding machine has problems such as material dead corner, it is better to replace the equipment. For the mold pouring system, exhaust slot, etc. causing color difference, can be solved by the corresponding part of the mold maintenance mold. The injection molding machine and mold problems must be solved first before organizing production to cut the complexity of the problem. 　　2. Eliminate the influence of raw material resin and color masterbatch 　　Control of raw materials is the key to completely solve the color difference. Therefore, especially when producing light-colored products, we cannot ignore the obvious influence of different thermal stability of raw material resin on the color fluctuation of products. In view of the fact that most injection molding manufacturers do not produce plastic masterbatch or masterbatch themselves, so that the focus of attention can be placed on production management and raw material inspection. In other words, we should strengthen the inspection of raw materials in the warehouse; use the same manufacturer and the same brand of masterbatch and masterbatch in the production as far as possible; for the masterbatch, we should carry out sample color test before mass production, not only to check with the last time, but also to compare in this time, if the color difference is not big, it can be regarded as qualified, if there is a slight color difference with the same batch of masterbatch, the masterbatch can be re-mixed and used again to reduce the color difference caused by the uneven mixing of the masterbatch itself. The color difference caused by the uneven mixing of the masterbatch itself. At the same time, we also need to focus on testing the thermal stability of the raw material resin and masterbatch, and we suggest the manufacturer to replace those with poor thermal stability. 　　3. Eliminate the influence of uneven mixing of masterbatch and masterbatch 　　Bad mixing of plastic masterbatch and color masterbatch will also make the product color change. After mixing the masterbatch and masterbatch mechanically, when feeding into the hopper through the lower suction material, the masterbatch will be separated from the masterbatch due to the electrostatic effect and easily adsorbed on the hopper wall, which will inevitably cause the change of masterbatch amount in the injection cycle and thus produce color difference. This will inevitably cause the amount of masterbatch to change during the injection cycle, thus resulting in color difference. This situation can be solved by taking the raw material into the hopper and then mixing it manually. Nowadays, many companies use feeder to add color masterbatch, which saves a lot of manpower and provides great help for color difference control, but many companies often have unsatisfactory results due to improper use. The amount of masterbatch added to the feeder at a fixed speed depends on the plasticizing time, which itself fluctuates and sometimes even fluctuates greatly, so to ensure a constant amount of feeding, the feeding time of the feeder needs to be fixed and the set time is less than the minimum plasticizing time. In the use of feeder need to pay attention to, because the feeder outlet is small, after using a period of time, may be due to the feeder screw in the accumulation of raw material powder particles caused by inaccurate feeding, or even cause the feeder to stop, so you need to regularly clean up. 　　4. Reduce the impact of barrel temperature on the color difference 　　Production often encountered due to a heating ring damage failure or heating control parts out of control long burn caused by barrel temperature changes dramatically, resulting in color differences. This kind of reason produces the color difference is easy to determine, the general heating ring damage failure produces color difference at the same time will be accompanied by uneven plasticization phenomenon, and heating control part of the uncontrolled long burning often accompanied by product gas spot, serious discoloration and even coking phenomenon. Therefore, it is necessary to check the heating part frequently during produ

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TPE/TPR material cold resistance function and odor principle discussion

First of all, we need to know the principle of human smell. The reason why people feel the smell of fragrance and odor is actually the molecules of a certain substance diffused into the human nose, which makes the human olfactory organs produce a series of reflections and form specific information into the brain, thus forming a certain odor judgment, such as aroma, odor, etc. So the odors we smell are small molecules that are volatilized into the air by the product. 　　Speaking of small molecules volatilized into the air, we have to mention a parameter in the raw materials - VOC (volatileorganic compounds) volatile organic compounds. There are two possibilities for no taste, one is that the material volatile small molecules itself has no smell, such as water; rather, will not volatile small molecules at all, such as table salt and other solids. But there is only one possibility of having a smell, that is, small molecules can be volatilized, and small molecules have an odor. 　　So elastomer formulations are most likely to volatile is a variety of oils, oil is good or bad directly affect the size of the product odor; the second is the content of each of the other formulations material VOC, try to choose a small VOC content of raw materials. And elastomer all kinds of raw materials are synthesized when the various organic solvents, the smell is inevitable, so the smaller the VOC content, the lighter the smell of the product. 　　At the same time, processing and mixing to minimize the destruction of the long chain, temperature and shear force should not be too high, appropriate, and oil absorption should be sufficient, all in order to reduce VOC. 　　Cold performance in which pieces, the rubber molecular chain will be reduced with the temperature, the ability to reduce activity, hardness, modulus and molecular friction increased to a certain low temperature when the molecular chain freeze, hardening completely lose elasticity, rubber or elastomer on the "plasticized". This temperature is the Tg glass transition temperature, but not all low temperature resistant materials are marked with Tg, because for some non-crystalline materials does not apply. 　　The influence of each component of the formulation on the low temperature resistance factors, right. 　　1.SEBS/SBS base material 　　It can be said that TPE/TPR inside the most important is SEBS/SBS, the impact is also the largest. Styrene and butadiene are hard and soft, so the lower the styrene content, the better the low temperature resistance of TPE/TPR. 　　2.TPE/TPV base material 　　For non-crystalline elastomer materials, the lower the cross-link density, the better the low-temperature resistance of the material, no chemical cross-linking TPE natural than TPV low-temperature resistance is better. 　　3. The choice of softening oil 　　White oil and other oils can reduce the hardness of the elastomer, low temperature resistance also has some favorable impact, but in the white oil selection to try to choose a lower pour point of oil. 　　4. The choice of filler 　　Fillers can not be used as far as possible, if you must use, try to choose some soft or spherical fillers, although the addition of fillers will not significantly affect the Tg glass transition temperature, but will affect the low temperature hardness, modulus and the rate of increase in intramolecular friction, so need to consider.

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