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What is the difference between a machine screw and a cap screw?
A machine screw typically has a slotted or Phillips drive whereas a cap screw typically has a socket or torx head.
What is the difference between single and double screw threads?
screw thread are single threads which means they are not double
Why the instrument is named Screw gauge?
The instrument is called a screw gauge, or more often a micrometer, because it uses a screw to amplify a very small movement so that it can easily be read. The heart of the screw gauge is a very accurately ground thread, usually of 0.5mm pitch, so that the axial movement of the screw corresponds to a much larger movement of a barrel which carries a scale. The instrument can be difficult to read because two readings have to be added, one measuring to 0.5mm the linear motion of the screw, and the other on the barrel giving the 1/100 ths. To some extent this instrument has been superseded by the electronic digital version, which does not incorporate a screw thread. A different gauge, called a thread gauge, comprises a set of metal blades with serrated edges which can be used to identify different screw threads by matching the right blade to the thread by trial and error.
What is mean by pitch scale in screw gauge?
Screw Pitch is defined as the axial distance between threads. One complete revolution of the screw will move it into an object the distance of the pitch. The smaller the pitch, the greater the mechanical advantage (ability to do work) achieved.
What is the difference between a wedge and a screw?
A wedge is a double sided screw basically. Therefore, the difference is the number of sides.
injection molding screw barrel?
injection molding screw barrel
Where is Screw Barrel used?
A Screw Barrel is primarily utilized in the plastic and rubber industry, specifically within extrusion and injection molding machines. It serves a critical role in these processes by facilitating the movement, melting, and mixing of materials. In extrusion machines, the screw barrel's primary function is to convey the plastic or rubber material from the hopper through the heated barrel. As the material moves forward, it is gradually melted by the friction and heat generated by the rotating screw and the external heating elements. The molten material is then pushed through a die to form continuous shapes, such as pipes, sheets, or profiles. In injection molding machines, the screw barrel operates similarly but with a distinct purpose. The screw rotates to melt and homogenize the plastic material, which is then injected into a mold to form discrete parts and components. The precision and efficiency of the screw barrel are crucial in ensuring the quality and consistency of the final products. The screw barrel's design and construction vary depending on the specific application and material being processed. It typically consists of a helical screw housed within a cylindrical barrel, both made from high-strength, wear-resistant materials to withstand the high pressures and temperatures involved in the extrusion and injection molding processes. In summary, the screw barrel is indispensable in the plastic and rubber manufacturing industries, playing a vital role in transforming raw materials into finished products through extrusion and injection molding processes. Are you looking for a Screw and Barrel Manufacturer Near You? Look no further! Contact Mahira Polyglobal today Get in touch with us: +91- 9081802800
What are the materials used in injection molding machines?
Many material can be used inection machine. For standard machine, PP,PE,ABS are ok. For PC,PMMA, PET, PVC, you need injection machine with special screw and barrel.
What is relation of shot capacity and shot weight in plastics injection molding?
Shot Capacity : The maximum weight of molten resin that the injection molding machine can push out with one forward stroke of the screw during injection molding operation. Shot weight : The weight of the material injected into the mold in a single shot by an injection molding machine. (Weight of the molded part(s) + Weight of the runner + gate and the sprue)
How do you calculate injection pressure from product before injection molding?
By deviding the multification of line pressure and screw dia with the crosssectional area of hydralic cylinder piston.
Injection mold?
A good way to cut the costs of injection molding is to automate the production process. This can eliminate labor costs and reduce variable operational costs. The human workforce is important and flexible, but it also adds to the cost of the finished product.
What is a screw barrel?
A type of muzzle loading firearm- catch is, you don't load it from the muzzle. The barrel is threaded onto the frame, and there is a wrench to unscrew it. With the barrel off the weapon, fill the chamber with powder, set a lead ball on top, then scew the barrel back on. While slow to reload, this design gave a very tight bullet-to-barrel fit, was very accurate and hard shooting. Link below is to a photo of a well made screw barrel pistol- you can see line where barrel unscrews.
What is the difference between injection molding in thermoplastics and injection molding in thermosetting plastics?
hi... EXTRUSION MOULDING means after the polymer granules are fed in hopper then it melts in barrel and go thru the rotating screw....a mould is fitted at the end of this assembly that continuously extrudes the polymer in a continuous long particular shape as pipe etc. this later can b cut at regular intervals if needed... while in INJECTION MOLDING as the molten polymer reaches the mold it takes the shape there cooled and then taken out frm the mold...if it consists of runners etc.then its separated and then the process agn starts... thus extrusion molding is a continuous process while injection molding is not. extrusion moulding is a continuous process, it gives a constant section.
What is the material for a screw barrel?
The material for a screw barrel, typically used in extrusion and injection molding machines, is usually high-quality, wear-resistant steel. Specifically, the screw barrel is often made from nitrided or bimetallic steels to withstand the high pressures, temperatures, and abrasive conditions inherent in the process. Nitrided steel is a popular choice because it offers a good balance between wear resistance and cost-effectiveness. It undergoes a nitriding process, where nitrogen is diffused into the surface to harden it, making it more resistant to wear and corrosion. Bimetallic screw barrels, on the other hand, have an inner layer made of a hard, wear-resistant alloy and an outer layer of a more flexible steel. This combination provides excellent durability and resistance to both abrasion and corrosion, making it ideal for processing abrasive or corrosive materials. Choosing the right material for a screw barrel is crucial for ensuring the longevity and efficiency of the machinery. It reduces maintenance costs and downtime, ultimately leading to more consistent and reliable production.Are you looking for a Screw Barrel in India ?Look no further! Contact Mahira Polyglobal today. Get in touch with us: +91- 9081802800.
How backpressure affects injection molding?
Injection molding requires good control of back pressure. This helps reduce the amount of shrinkage of the product’s surface and improves product quality. To ensure quality, work with a plastic injection molding company. This ensures you get the highest quality product possible. Back pressure is not an option on every machine. When using high back pressure, it is essential to check the length of the fibers. This is important because long fibers are more likely to break. When choosing plastics for injection molding, always keep in mind the manufacturer’s recommendation and the maximum pressure the plastic can withstand. Back pressure in injection molding can be adjusted according to the product’s structure, size, and color. It is generally set between three and fifteen kilograms per cubic centimeter. When using high back pressure, be aware that it will cause excessive holding pressure on the injection molding machine. It can also result in defects along the parting line or boundary. Unlike high-pressure molding, back pressure does not raise the melt temperature, but it will increase the speed of the injection screw. The screw is responsible for 70-90% of the energy needed to melt plastic, so it is essential to adjust back pressure accordingly. It can reduce glue walking around the product. Back pressure in injection molding is a factor that can help minimize glue walking around the product. This pressure is usually set at three to 15 kilograms per cubic centimeter. The exact back pressure needed for a specific product depends on its structural design, the quality of the raw materials, and drying conditions. Back pressure exerted in injection molding can also increase during color mixing, airiness, or shrinkage. It can also be decreased to reduce the effect of salivation or glue leakage. Proper back pressure in injection molding is critical to achieving the best plasticization quality. Without it, the injection unit volume is unstable, and glue walks around the product. Low back pressure can also lead to product weight and size changes. It can also cause the glue to leak out of the nozzle and reduce plasticization efficiency. Moreover, excessive back pressure can lead to the premature burnout of the heating ring near the nozzle, and increase the mechanical wear of the pre-molding mechanism. Proper back pressure in injection molding is also important for the quality of the molten material. It can help eliminate the possibility of glue walking around the product. Proper back pressure reduces the amount of glue walking around the product and keeps the screw in the bottom of the products. Proper back pressure also helps in the removal of old colorants during color change.
What Is Back Pressure In Injection Molding?
Back pressure is an important parameter used in the injection molding process. It helps control the quality of the molten material and the resulting products. Specifically, it can be used to reduce air on the product’s surface, glue walking around the product, and shrinkage. To achieve this, the back pressure must be at a minimum level. What is back pressure? Back pressure is an important parameter to control the quality of molten plastic material and products in the process of injection molding. The back pressure of the injection molding machine is a critical parameter to control the quality of products and molten materials. When the back pressure is too high, the screw may retreat and the molten material will be less dense at the front end of the screw, causing more air to enter. This can lead to poor plasticization and instability of the injection molding process. It can also cause significant changes in the weight, size, and surface of products. All of these factors can affect the overall quality of a product. Back pressure is often ignored in the process of injection molding. However, it is an important parameter that is important for controlling the quality of the molten material and products in the process. Several other parameters must be considered, but back pressure is an essential one. Back pressure is a parameter that must be calculated before the injection process. The opening pressure must be high enough to hold the mold open and maintain the injection speed. However, once the mold is filled, high injection molding pressure is no longer necessary. It can reduce air on the surface of the product. Back pressure is a process parameter that affects the quality of the molten material and the final product. It reduces air on the surface of the product and is a key control parameter in injection molding. High back pressure increases the consistency of the molten plastic and improves the gloss of the finished product. Injection molding should be performed with a back pressure of three to fifteen kilograms per cubic centimeter. Back pressure in injection molding can be achieved by controlling the temperature of the product. When the melt temperature control of the mold is higher than the ambient temperature, the molten resin will flow more smoothly. If the temperature is lower than the ambient temperature, the material will be too cold before the injection process is completed. The melted plastic will not flow through the mold if trapped air is trapped on the surface. To overcome this problem, the injection speed and pressure can be adjusted. Increasing the mold temperature will also help to prevent premature cooling of the material. Back pressure is primarily of concern in the injection area, but can also occur in the clamp pressure unit of the injection molding machine. A good way to reduce the air on the surface of the product is to use a large gas vent and mold vacuuming. Proper gas venting will eliminate any air trapped on the surface of the product and prevent substandard welds. It can reduce the shrinkage of the product surface.
How do you calculate for the injection machine capacity?
The capacity for injection machine has something to do with the injection machine screw volume. Usually one injection machine offers option for 3 or more screw with different volume. The injection weight= volume*density of plastic material. The product weight should be less than 80% for the theoretical injection machine capacity.
