plastic stool mold


Plastic Stool Mould: Create Stools That Won’t Let You Down

Plastic stools are inconspicuous furniture pieces that are ever-present in residential houses, gardens, and workplaces all over the world. But do you know how these tools are formed? It’s all because of the plastic stool mould, of course!

Moulding Magic: From Design to Production

A plastic stool mold is like a giant cookie cutter, but for molten plastic.  The mould is usually made of high-grade steel and is meticulously designed to capture all details and intricacies of the stool intended to be made.  This design process requires the product designers and mould-making professionals to work hand in hand.

After finalizing the design, the plastic stool mould comes to fruition through the blend of advanced techniques such as CNC machining and EDM or Electrical Discharge Machining. Computer-controlled tools are used during CNC machining to carve the preferred shape into the steel. EDM, on the other hand, deals with more intricate details or tight corners with precise electrical spark erosion.

plastic stool mould

The Anatomy of a Stool Mould

A plastic stool mold is made up of two primary parts, namely the core and the cavity. The cavity defines the outer shape of the stool, while the core forms any hollow sections or interior features.  These two components are designed to interlock perfectly, creating a sealed cavity when shut.

Beyond the core and cavity, a well-designed mould incorporates a network of channels for molten plastic to flow through or runners and for efficient cooling or cooling lines.  The gate system, where molten plastic enters the cavity, plays a crucial role in ensuring a smooth flow and minimal waste.

The Moulding Process: Bringing Stools to Life

The plastic stool mould forms the heart of a production process called injection moulding.  The molten plastic gets heated to a certain temperature according to the selected material, which is usually often polyethylene or polypropylene for stools. It is then injected into the closed mould cavity under high pressure.

The cavity is then filled by the molten plastic that conforms to all nooks and crannies of the mould design.  The cooling lines then rapidly bring down the temperature, solidifying the plastic into the desired stool shape. Once cooled, the mould opens, and the freshly formed stool is ejected, ready for any finishing touches like deburring or stacking.

Beyond the Basics:  Mould Design Considerations

While the core concept remains the same, plastic stool mould design can be surprisingly intricate. Factors like:

  • Stackability

Moulds can be designed to allow multiple stools to nest within each other for efficient storage and transportation.


  • Strength and Weight

Adjustments can be made to the mould design to optimize the balance between stool strength and weight by incorporating ribbing or varying wall thickness.

  • Surface Texture

The mould surface can be textured to create a smooth, patterned, or anti-slip finish on the final stool.

The Mould’s Enduring Legacy

A plastic stool mould when made with great care is a worthwhile investment that rolls out large quantities of stools over its lifetime.  A plastic stool mold guarantees consistent quality, efficient production, and the ability to create a vast array of moulded plastic stool designs for every need. 


Hot runner direct gate

What is hot runner mold

To make plastic parts more efficiently and with shorter cycle times, the hot runner mold is a technology that is used in injection molding. Conventional injection molding involves pouring molten plastic into a mold, which then cools and solidifies to produce the intended product. When using hot runner injection molding, however, a network of heated channels—called hot runners—integrated into the mold aids in maintaining the plastic’s molten state during the molding process.

Hot Runner Mold Components

In order to keep the plastic material molten and make injection molding easier, a hot runner mold system has multiple parts. A hot runner mold primarily consists of the following parts:

  1. Hot Runner Manifold: An injection molding machine’s nozzle transfers molten plastic to the mold’s individual cavities through a manifold, which can be either a block or a network of channels. In order to keep the plastic from cooling too quickly, it is usually heated.
  2. Nozzle: The hot runner manifold is attached to the molding machine through the hot runner nozzle. Its purpose is to feed the molten plastic into the mold cavities via the hot runner system.
  3. Gate: The gate is the opening through which the hot runner system pours the molten plastic into the mold chamber. This essential part regulates the plastic’s flow into the mold, which in turn affects the part’s end properties.
  4. Heaters: Nozzles and the manifold that make up the hot runner system are kept at a constant temperature by means of heating elements. Maintaining a molten state for the plastic during its flow through the hot runner channels requires precise temperature control.
  5. Thermocouples: These little devices are used to measure and control the temperature of the components that make up the hot runner. They make sure the hot runner doesn’t get too hot by feeding information back to the control system.
  6. Temperature Controllers: To keep the temperature uniform throughout the hot runner system, temperature controllers monitor the thermocouples and adjust the heaters accordingly. In order to achieve consistent plastic flow and avoid temperature fluctuations, temperature controllers are crucial.
  7. Hot Runner Drops: The manifold has individual channels called “hot runner drops” that lead the molten plastic to certain mold cavities. Every drop corresponds to a specific gate and cavity.
  8. Mold Cavities: The mold’s interior hollow spaces, called “cavities,” are where the molten plastic is injected to create the finished product. The geometry of the final product is dictated by the form and pattern of the mold cavities.
  9. Cooling System: A cooling system may be necessary to regulate the overall temperature of the mold and help the plastic solidify after it has filled the cavities, even though the hot runner components are heated.

All of these parts form a closed-loop system that gives you complete command over the injection molding procedure. When improving part quality, decreasing cycle times, and minimizing waste are of the utmost importance in high-volume production scenarios, hot runner systems shine.

Advantages of Hot Runner Mold

Companies that do plastic injection molding are switching from cold runner molds to hot runner molds more and more. This is because hot runner molds are better in many ways than cold runner molds. Hot runner molds are the best choice for many manufacturers, and this article will talk about all of them.

Hot runner molds cut cycle time by a huge amount, which is one of their best features. With hot runner molds, you can get things done faster since the plastic can cool down faster. Business can get more done for less money when they can make more parts in less time.

If they are used right, hot runner molds can also help make the product better all around. If you don’t use hot runner molds, the material is less likely to break or become uneven while it’s being shaped. This lets you make high-quality parts with a smoother surface and more accurate sizes.

You can also make designs with more freedom when you use hot runner molds. Because they let you finetune the flow of the plastic, hot runner molds let you make parts that are more complicated and detailed. It’s helpful for businesses that need parts that are very specific or made just for them that this is available.

Making less waste is another thing that hot runner molds can do. When you use regular cold runner molds, you waste a lot of material while the mold is being made. A cold runner system is not needed when hot runner molds are used. This lowers the cost of making things and cuts down on waste by a large amount.

Hot runner molds can also be used to make molds with lots of holes. It is possible to make many parts at once because hot runner systems can be changed to fit different holes. They might be able to make more things and work better with this.

Last but not least, hot runner molds are better than cold runner molds in many ways. When a business does plastic injection molding, hot runner molds are very helpful. The main reasons for this are the many benefits they provide, such as shorter cycle times, higher quality parts, more design freedom, and less wasteful use of materials. Hot runner molds are an investment that can help a company make better products and stand out in the market.Hot runner mold

Different between hot runner mold and cold runner mold

Common injection molding molds are referred to as hot runner molds or cold runner molds. While both are capable of producing plastic components, their distinct characteristics render them more suitable for particular applications. This article will assist you in determining which of cold runner molds and hot runner molds is most suitable for your application by contrasting the two.

It is necessary to begin by providing definitions of hot runner mold and cold runner mold. Hot runner molds obviate the need for a runner system by directly introducing molten plastic into the mold cavity via a network of heated components. Hot runner molds are the optimal choice for large-scale manufacturing due to their ability to reduce material waste and cycle times. On the contrary, cold runner molds employ a specialized runner mechanism to convey the molten plastic from the injection unit to the mold chamber. Often the most economical option for smaller production runs, cold runner molds generate more waste material and have longer cycle times.

Are you able to regulate the temperature? This is one characteristic that distinguishes cold runner molds from hot runner molds. Lengthened cycle times and improved part uniformity are two advantages of utilizing a hot runner mold, which maintains a constant temperature throughout the mold. Nonetheless, fluctuations in temperature can compromise the quality of the components and extend the cycle times of cold runner molds. When dealing with heat-sensitive materials that require precise temperature control, hot runner molds are often the most suitable option.

Another crucial differentiation is that the maintenance requirements for hot runner molds differ from those of cold runner molds. Regular maintenance of hot runner molds can be more difficult and costly than that of cold runner molds in order to ensure that the heated components continue to function properly. However, for certain applications, the reductions in cycle time and material waste may justify the foregoing of maintenance costs.

When hot runner molds are utilized, a distinct runner system is unnecessary, which provides designers with increased flexibility regarding gating and part design. This enables the fabrication of components featuring more intricate and complex designs than are feasible when employing cold runner molds. Cold runner molds are frequently favored, notwithstanding their restricted design flexibility, for simpler part geometries and lower production volumes.

Ultimately, the requirements, budget, and production volume of your project will dictate whether cold runner molds or hot runner molds are superior. For smaller production runs involving simpler part geometries, cold runner molds may offer greater cost-effectiveness. Conversely, hot runner molds are more suitable for high-volume production runs that require precise temperature control and expeditious cycle times. With knowledge of what to anticipate from a cold runner mold and a hot runner mold, it is possible to select the appropriate mold for an injection molding project.

The selection between a hot runner and cold runner mold is determined by manufacturing volume, component complexity, material expenses, and application specifications. Hot runner molds are the optimal method for mass-producing complex components in large quantities in order to achieve maximum efficiency and minimize waste. However, cold runner molds may offer greater cost-effectiveness when applied to smaller runs or components featuring simpler geometries.

3 plate mold

What is 3 Plate Injection Molds

3 plate injection mold (three plate injection mold) is one of the injection molding tools that manufacturers use to create plastic components. Other tools include injection molding tools. It is impossible to have a complete mold design for a plastic product without the three primary plates that are responsible for forming the cavity and runner system of the mold. People tend to refer to the first of the three plates as “A,” the second as “B,” and the third as “C” of the set. The following is a compilation of the functions that they perform:

  • Plate A, also known as the first plate, is the mold’s foundational, immovable surface. It typically includes the sprue, the main conduit for injecting molten plastic into the mold.
  • The second plate, or B plate, is a movable one that aids in making the main hole for the plastic component. The B plate is moved when the mold closes, letting the molten plastic flow into the cavity and shape the product as desired.
  • Three-Plate C-Shape: An additional moveable plate that helps eject the molded part from the mold is the C plate. At the end of the molding process, it usually has ejector pins or some other mechanism that forces the plastic component that has solidified out of the mold.

Distancing the runner system from the molded part is the defining characteristic of a three-plate injection mold. The injection unit empties its molten plastic into the cavity via the channels that make up the runner system. The benefits of this separation include shorter cycle times and easier product ejection, and it also makes it possible to create more complicated mold designs.

3 plate injection mold

I. Components of a 3 Plate Injection Mold

When plastic injection molding parts with more complicated geometries are needed, a three-plate injection mold is an advanced tool that helps with the process by automatically and efficiently separating the part from the runner system. Compared to the more basic two-plate mold, this one has an extra parting plane. A three-plate injection mold system consists of the following primary parts, each of which performs a specific function:

A-Side: In a three-plate injection mold, the A-side is the main cavity plate that shapes the outside of the part that is molded. It has two parts: the core half, which shapes the inside of the part, and the cavity half, which shapes the outside. When the A-side is put on the fixed side of the injection molding machine, it stays in place while the mold is being made.

B-Side: The B-side of the mold, which is also called the “stripper plate,” supports the parts on the A-side and makes it easier for the molded part to come out. It moves with the A-side as the mold opens and closes, which makes it easy to take the part out of the mold after it has been molded. Usually, the ejector pins are on the B-side. These pins push the part out of the mold after it has cooled.

C Plate: The C plate, also called the runner plate or Floating Plate, It houses the runner system that distributes the plastic melt to the different gates. This plate moves independently in a three-plate mold, C plate located between the top and cavity plates, the floating plate houses the gate mechanism. enabling the runner system and parts to be ejected independently, this is key different between 3 plate mold and 2 plate mold.

Sprue and Runner System: In a three-plate injection mold, the sprue and runner system moves the molten plastic from the injection unit into the mold’s slot. The sprue is the opening in the mold where the plastic goes in, and the runners move the material to the different holes. For balanced filling and short cycle times, it’s important that the sprue and runner system is designed correctly.

Cooling System: An effective cooling system is needed to keep the molded part’s structure and cut down on cycle times. A 3-plate injection mold’s cooling system is made up of channels that move coolant around the mold. This gets rid of the heat and hardens the plastic. For warpage, sink marks, and other flaws in the final part to be avoided, the cooling design must be done correctly.

The parts of a three-plate injection mold work together to make precise, high-quality plastic parts quickly and easily. Figuring out what each part does in the molding process is important for making the best molds, cutting down on cycle times, and making sure that the quality of each part is always the same. When manufacturers pay close attention to the A-side, B-side, C-side, sprue and runner system, and cooling system, they can get better results from their injection molding operations.

A Three-Plate Mold Has Many Benefits:

Enhances cycle times by enabling the automated and concurrent ejection of runners and parts.

Allows for the molding of components with more intricate geometries.

It can improve the plastic flow into the mold by incorporating multiple gates.

Drawbacks: Compared to 2 plate molds, it is more complicated, costly, and difficult to produce and maintain.

The complexity of runner ejection could cause longer cycle times.

When it comes to making plastic parts, a three-plate injection mold is a useful tool that allows for the efficient and flexible production of complicated components.3 plate injection mould

If you have a project that you do not know if needs 3 plate injection mold, 2 plate injection mold or hot runner mold? Welcome to contact us, we offer 3 plate injection mold, 2 plate injection mold and other type of plastic injection molds, we will review this for you and send you a quote according to your part design.

ST Plastics has the capability of molding all different rubber types, including difficult to process rubbers like carboxylated nitrile. Colson Plastics has been inserted and overmolding rubber for over fifteen years. 

An advantage ST has over other rubber injection molders is the product size they are capable of producing. Products can be molded of rubber that weighs up to 25 pounds.

ST has considerable experience processing nitrile, neoprene, SBR, EPDM, and carboxylated nitrile rubbers.

Plastic Injection Mold Manufacturer China

Mold manufacturer China service will be of the best way for the overseas customers who need custom plastic injection molds.

With rising demand for the production of plastic parts across the globe, injection molding has become one of the most popular manufacturing processes. In China, injection molding is a booming industry and widely used to produce plastic parts of numerous varieties. If you’re looking for a reliable plastic injection mold manufacturer that can provide a wide range of plastic parts for your business, then China is certainly worth considering.

Why Choose a Mold Manufacturer China?

There are a few key benefits of working with a Chinese mold manufacturer, including:

  1. Cost-Effective Production: Compared to many other regions globally, China has lower manufacturing costs, which means you can often save money on the production of your plastic parts by working with a Chinese mold manufacturer.
  2. High-Quality Production Standard: Many Chinese mold manufacturers have advanced technology and equipment, ensuring high precision and consistency in the manufacturing process. Moreover, many manufacturers adhere to strict international quality standards, which helps to ensure high-quality production outcomes.
  3. Wide Range of Plastic Injection Molding Capabilities: Chinese mold manufacturers generally have extensive experience and can offer a wide range of plastic injection molding capabilities, including injection molding, overmolding, insert molding, and much more.

Finding the Right Mold Manufacturer in China

If you’re looking for a reliable mold manufacturer China partner, here are a few tips to help you find the right manufacturing partner:

  1. Conduct Thorough Research: Do your research to identify and analyze potential mold manufacturers in China. Check out their website, read reviews, and try to identify the right partner that matches your needs.
  2. Assess Manufacturing Capabilities: Understand the specific plastic injection molding capabilities of different mold manufacturers to find the right partner that can meet your needs.
  3. Check Quality Credentials: Ensure that the selected mold manufacturer has the relevant quality certifications and manufacturing credential to guarantee quality output and compliance to international standards.

Injection molded plastics are cost effective in the long run as they offer benefits of flexible designing and low cost of mass production. The recent stats have reversed that plastic production equipment industry has thrived with the market growth greater than ever as these molded plastics have certainly replaced metals in a number of industrial applications.

On industrial scale, molded plastics are produced by compressing liquid plastic in a molded form with Plastic injection mold as these machines release the molded products as they gains their solidified form. After years of industrial practice, manufacturers have listed down some major raw materials that are now commonly and commercially utilized in molding industrial plastics. Some of the most ideal foil plastics include PP, ABS, HDPE, and PS that are carried under manufacturing prescribed standards for manufacturing plastic for industrial and commercial applications.

In the automotive industry, molded plastics are utilized for molding ancillaries, dashboards and door handles for automotive vehicles.  Similarly, molded plastics are taken under employment for packaging household consumer based products as the offer safety and durability due to their light weight and unbreakable structure. Injection molded plastics are also increasingly popular among house ware and personal care sectors as their increasing application is the reason behind their augmented demand in the market.

The global research on Injection Molded Plastics 2014-2018, further predicts the instability of raw material, as their demand is direct affecting the supply growth in the market. The cost of Plastic injection mold makers is though high in demand, however the fluctuation and instability in price of crude oil is making it difficult for manufacturers to uphold the margin of profitability in the long run

We offer:
Services for custom injection molding and custom Injection Mold Design and mold ManufacturingMold Manufacturer China
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providing precision quality, dedication, teamwork, and total customer satisfaction.

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Plastic injection molding company based in China serves worldwide.
Elastomers molding – Rubber & Silicone

We are a China based reliable, innovative supplier in the plastics injection molding services business. We dedicate to the principle of “quality is second to none” and always can tailor a solution for each of our customers with the possible low costs on tooling and as well as on production process. By taking the advantage of relatively low labor cost, our specialty is mass production of small or medium sizes molded plastic parts, like packaging plastic bottle closures (cap), electronic components, EIFS washers, wall anchors or plugs and other customized industrial, packaging and household plastics partsˇ­

The molding company capacity for molds clamping force starts from 85 to 1650 tons, so no matter a tiny plastic screw or a big interior bucket of a washing machine, we can always get the jobs done easily and precisely with our latest sophisticated automatic molding machines. We also have our onsite plastic injection molding engineers to help you in the prototype design, tooling, and trouble shooting processes.

By keeping the pace of the world most advanced plastic processing technology, customer-centered services and cost effectiveness, we grows up and became strong. We seek to preserve our long-term relationships with existing customers and attract new customers through the establishment of value added relationships well beyond plastic parts requirements. These were the principles upon which we were founded in 2005 and remain the main operating philosophy of the company today.

As the increasing demands of our customers, we expanded our business to die casting parts and plastic profile extrusion in the year 2006 and achieved a great success. Now, we are making varies kinds of plastic packaging products like: folding blister, clamshells, clear folding cases by PVC, PS, PETG and other materialsˇ­

Final Thoughts

If you need a reliable mold manufacturer China, it’s crucial to have a good understanding of their manufacturing capabilities, quality standards, cost, and other parameters. This article aims to give you an insight into the key considerations you should bear in mind while working with the Chinese mold manufacturer to get the best results.

We create advantages; We enhance your competitiveness. if you are looking for mould suppliers in china to support you, Contact us today!