Here we show the difference between Injection molding and compression Molding in terms of the Definition, manufacturing process, materials used, production rates, cost, and application. Please go through this to learn more about these two processes.
In Jution Silicone & Rubber Co., LTD, We offer the injection molding service and the compression molding service according to the customer’s different silicone products. Choice of the best-fit silicone molding process for our clients.
Injection molding is a molding process that’s defined by its use of injection technology. It’s called “injection molding” because it involves the injection of raw material into a mold cavity. During injection molding, a screw pulls the material into a hopper. The heating process follows, and then injection into the mold cavity. The heated material cools and sets in the shape of the mold cavity.
Injection molding is a manufacturing process used for the mass production of identical plastic parts and liquid silicone rubber. It’s a method of silicone injection where Liquid Silicone Rubber is inserted into a mold to produce a part in the shape of the mold cavity, creating a physical representation of molded silicone products.
This method offers many benefits in terms of production.
Jution Silicone & Rubber Co., LTD provides LSR injection molding service for you. If you have any silicone products that need LSR injection molding service, please contact our molding technical expert to support you!
Custom LSR(Liquid Silicone Rubber) Injection Molding Service
Liquid Silicone Rubber (LSR) Injection Molding What is LSR(Liquid Silicone Rubber) Injection Molding? Liquid silicone rubber injection molding is the process used with liquid silicone rubber (LSR) to fix the material from an uncured state into a cured products. Liquid Silicone Rubber (LSR) can be processed in a liquid injection molding (LIM) process. The liquid raw material is…
Compression molding uses heat and pressure to shape silicone products. The process starts with placing silicone in a heated mold that matches the final design. When the mold closes, pressure is applied, making the silicone fill the mold. Heat then cures the silicone, turning it into a strong, flexible material. After curing, the mold opens, and the finished part is removed. This method is efficient for creating precise, durable silicone parts and is widely used in industry.
During the flow of the molded material filling the mold cavity, not only the resin flows, but also the reinforcing material, so the molding pressure is higher than that of other processes, and it is a high-pressure molding. Therefore, it requires both a hydraulic press that can control the pressure and a metal mold with high strength, high precision, and high-temperature resistance.
This method is usually suitable for silicone rubber, thermosetting and thermo-softening plastics, as well as advanced composite materials. Compression molding employs a heated cavity and vertical press mechanism which makes the necessary tooling easy to construct and maintain. It can be used in both low and high-volume production.
Compression molding wastes less material than injection molding, as no runners, sprue, or gates are required to form the part. Consequently, this technique produces an aesthetically as well as functionally superior surface finish. It is the go-to technique for large flat and curved components. This molding technique outperforms other manufacturing techniques when composite materials are used to give extra stiffness, corrosive resistance, durability, and other special material properties.
Custom Silicone Compression Molding Service
Custom Silicone Compression Molding Service Transform Your Design Into a Masterpiece with Our Custom Silicone Compression Molding Service – Precision, Quality, and Excellence at Your Fingertips! What is Silicone Compression Molding? Silicone Compression Molding is a high-precision manufacturing process utilized to fabricate intricate, durable silicone components. Esteemed for its versatility and cost-effectiveness, it is often chosen for producing…
Compression molding, like any manufacturing technique, has its limitations:
Our Engineer will suggest what kind of molding is the best way to fit your silicone products.
The injection molding process should be from the mold design to the ejecting. Jution Silicone & Rubber Co., LTD has a professional mold and mechanical designer to help design the silicone tooling by Solidworks, pro-engineer、UG、AUTOCAD.
Before we make the mold tooling design, we will make the DFM to the clients first and let the products fit the manufacturing.
Then Jution Silicone & Rubber Co., LTD designer Uses computer-aided design (CAD), a mold or tooling in the form of the product part is created, made, and divided into two halves.
The mold itself consists of two separate parts: the injection mold that shapes the plastic entering the machine and the ejector mold that pushes the solidified product out of the machine, ready for it to continue its journey along the production cycle. The molds must be treated with the utmost care to prolong their useful life. Ideal humidity and temperatures must be maintained to ensure optimum performance and prevent warping.
The machine’s clamping unit forces and firmly holds the two mold halves together. This stage will take longer for larger machines to complete than for smaller ones. There are 2 types of clamping methods, the toggle type and the straight-hydraulic type in which a mold is directly opened and closed with a hydraulic cylinder.
Jution have two kind of LSR injection molding machine that can offer these two types of clamping methods.
The raw materials of Liquid silicone rubber, The screw is rotated. After the required amount of LSR material is accumulated, the injection process is started
A molding consists of a sprue to introduce liquid silicone rubber runner to lead it to cavities, and products. Since obtaining only one product by one shot is very inefficient, a mold is usually designed to have multiple cavities connected with a runner so that many products can be made by one shot.
If the length of the runner to each cavity is different in this case, the cavities may not be filled simultaneously, so the dimensions, appearances or properties of the moldings are often different cavity by cavity. Therefore the runner is usually designed so as to have the same length from the sprue to each cavity.
Pressure builds up and holds the material together. The shot is the precise volume of material poured into the mold.
Our expert LSR mold design will keep the eyes on the mold flow about the shot. To keep all the cavities silicone products have the same Performance.
As the molten substance in the mold makes contact with the surfaces, it starts to cool and solidify into the shape of the desired part.
There are two primary types of cooling in injection molding — traditional cooling and conformal cooling. Each one is built on the general concept of cooling channels through which a cooling agent (such as coolant or water) can flow. Yet each is also quite different in terms of execution and results:
After the two halves have been split by the clamping unit, the cooled, completed item is expelled from the mold using the ejection unit. Ejection is a process of removing the plastic material from the mold. These are of different types to remove the material from mold.
The typical production cycle is quite brief, lasting only 2 seconds to 2 minutes. After step 5 is finished, the cycle resumes at step 2, where a copy of the part is created.
Tooling can be produced in a number of ways, From CAD mold flow, Then CNC, EDM machining, die casting, etc.
Our workers put the cutted and weighted material into the mold or tooling cavities.
The product is heated until somewhat soft and pliable. A hydraulic tool presses the material against the mold. Once the material is hardened and has taken the shape of the mold it is ejected.
When the silicone is fully cured, the vulcanizing molding machine will release the pressure automatically, tool mold will come out and open for molding operators to remove the molded silicone parts. The raw material will be placed again for the next round of vulcanization.
The final products will require additional work, such as cutting away the flashing.
The products will be ready immediately upon leaving the mold.
The typical production cycle is quite brief, lasting only 2 seconds to 2 minutes. After step 5 is finished, the cycle resumes at step 2, where a copy of the part is created.
Then there will be QC and make Secondary Vulcanization if needed.
In Jution Silicone Rubber we have more than 100 skilled worker run the compression molding for our clients. (From compression mold to the molding). If you have any silicone products that need the compression molding service, contact our sale expert.
The first point of action for every manufacturing process is deciding the material to use for production. Likewise, material selection is a vital point of consideration when deciding between compression molding vs injection molding.
While both processes support a wide variety of plastics, they have some peculiarities.
The material options for injection molding include the following:
The materials used in compression molding encompass a diverse range, each suited for specific applications. Here’s a streamlined overview:
Viscoelastic polymers with insulating properties and chemical resistance, used in various applications.
Our factory specializes in compression mold tooling and injection mold tooling. We primarily offer HTV silicone rubber for compression molding and LSR for injection molding, with additional materials sourced from partners when necessary.
Injection molding requires very high injection pressures. The mold must therefore be built to withstand these high pressures. This adds cost to the tooling. The tooling cost is around 1500 USD-20000 USD
When it comes to individual part costs, injection molding can produce inexpensive, complex parts. However, this process is only cost-competitive if production run volumes are large enough to spread the high cost of injection molding tooling over a sufficient number of pieces. When you have a silicone product you do not know which molding method is better for you, you can contact us to get more advice.
Compression molding has cheaper tooling costs. The prototype tooling cost is around 199 USD-1999 USD. The mass production tooling cost is 999-9999 USD.
At lower volumes, compression molding is cheaper than injection molding due to the lower initial mold costs.
Some of the advantages of injection molding over compression molding include the following:
Why do manufacturers choose compression molding techniques for certain projects? There are several advantages to this process that make it the right choice for certain objects. Those benefits include:
Injection molding is frequently utilized for a range of applications due to its adaptability. The procedure can be used to improve everything from medical silicone components to tiny, delicate auto parts. Other instances of applications include:
Compression molding is ideal for manufacturing stronger, more durable parts. Today, the process is often central to the creation of automotive and appliance parts. Other applications include:
So, the real question here isn’t which will you choose, it’s WHY will you choose it? Compression molding and injection molding each have their advantages and disadvantages, but who reigns supreme depends on what you’re producing.
It’s important to select a manufacturer like jution silicone rubber who understands which technique best suits your part, as that should be the deciding factor. Regardless of which one is better suited, has the capabilities to cover both your compression and injection molding needs.
Reach out if you have a project that needs jution silicone rubber expertise and supply chain solutions!
According to this article, you will know more information about the injection molding VS compression molding. When you have a silicone product need to molding, contact Jution expert. Our skilled Engineer and workers will offer the one stop service from the silicone mold tooling to the finished silicone products for you.
With high quality products and considerate service, we will work together with you to enhance your business and improve the efficiency. Please don't hesitate to contact us to get more details of SMC Mold.