Best Injection Molding Machine in china

TOPSTAR is a leading manufacturer of injection molding machines in China. TOPSTAR provides you with the best horizontal injection molding machines with a clamping capacity of 60 to 5,500 tons. Choose from all-electric, servo or hydraulic machines with all-round plastic processing technology.

No matter what kind of injection molding machine you need, we can meet your needs very well. Our injection molding machine team has more than 30 years of design and manufacturing experience. We also provide a wealth of peripheral equipment for injection molding machines to choose from. Including injection molding machine robots, etc.


TOPSTAR injection molding machine model

TOPSTAR is China’s leading manufacturer of injection molding machines and injection equipment. Our factory mainly manufactures the following three series of injection molding machine equipment. In addition, there are various injection molding machine peripheral equipment including injection molding machine robots for customers to choose from.

Your Best Servo Series Injection Molding Machine

TM servo injection molding machine is equipped with an advanced servo system. Compared with ordinary injection molding machines, our servo injection molding machine has improved production efficiency, precision and durability. Reduce energy consumption (energy consumption can be reduced by 35%-75%), extend the service life of the machine, and reduce maintenance costs, each injection molding machine is designed and manufactured by our professional engineers, and is controlled by imported high-end KEBA controller with high stability and convenient operation.

Your Best Direct Pressure Injection Molding Machine

EVH Series straight pressing mould clamping injection moulding machine is characterized by its unique mould clamping structure, stability, high efficiency and energy saving. By adopting advanced electrical appliances and hydraulic pressing components from domestic and abroad, the repeat and dimensional accuracy of products have been greatly improved. Compared with the traditional toggle clamping, the straight pressing mould clamping has less vulnerable parts and longer mechanical life.

EVH Series Direct Pressure Injection Molding Machine utilizes key components from the world-renowned manufacturing of Servo system, Microprocessor controller hydraulic systems electrical parts and lubrication parts.
The design utilizes very sturdy mechanical components. Ability to process all types of Thermoplastic and Thermoset materials with a wide range of Screw and Barrel for each application.

Your Best Container-Specific Injection Molding Machine

SEVH series container special injection molding machine is an injection molding machine that we specially manufacture for civilian container products. The injection molding machine has a good structural design and uses the best casting materials.
SEVH Series injection molding machine adopts Austria’ s KEBA control system dedicated to two-platen injection molding machine.
This powerful system can accurately control the position, pressure, speed, temperature and other parameters. The whole control system is engineered based on reliability, stability, safety and user-friendly operation for better user experience.

TM series injection molding machine
TM Series Articulated Injection Molding Machine
TH series injection molding machine
EVH Series Direct Pressure Injection Molding Machine
Electric injection molding machine
TE Series Electric Injection Molding Machine
SEVH Series Container Injection Molding Machine
SEVH Series Container Injection Molding Machine

Technical parameters of TOPSTAR injection molding machine

TOPSTAR is an expert in China’s injection molding machine manufacturing. We have 30 years of rich experience in injection molding machine manufacturing. The following are some technical parameters of our injection molding machine. If the following injection molding machine parameters cannot meet your requirements, please contact us.

Advantages of our injection molding machine

TOPSTAR is a leading manufacturer of injection molding machines in China. Our factory has a complete production chain of injection molding machines. By matching with our injection molding machine peripheral equipment, we can maximize the creation of value for customers, and we also provide customers with complete solutions for injection molding products. Many outstanding engineers are at your service.

Each of our injection molding machines is cast with high-quality materials and the best structural design is used to improve its stability.

TOPSTAR’s injection molding machine has an advanced oil circuit design, matched with a European professional controller, which makes the machine action stable, high product yield, fast response speed, precise control, simple operation, and meets a variety of process requirements.

Excellent clamping device design

Excellent clamping device design
  • TOPSTAR injection molding machine toggle adopting the conjoined structure, improving the hardness of toggle, ensuring the uniform of toggle manufacture-size, minimizing the gap between pipe and pin, improve the accuracy and application life of toggle.
  • First clamping platen using the box-type structure design, (thicken the thickness of platen, improving the hardness of platen, efficiently minimizing the deform caused by the force of tie bar.
  • Unique third-platen flange design, when the third- platen deforms by the pressure, by the support of flange and tie bar. a reverse torque will minimizing the deform of the third-platen.
  • Adopting gear-adjusting ring with high-precision, large-scale transfer and compact structure to facilitate customer adjusting (the mold thickness in manual or automatic mode.
  • Steel bush in clamping unit adopts new structure, arrange rational holes of graphite to improve the effect of steel bush lubrication and the wear-resistance, reduces the usage of lubrication oil.·
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Best Injection Unit

  • Injection unit adopts double-cylinder design, more higher injection pressure, more simpler structure and lower malfunction rate.
  • Enlarged-cylinder, adopting two-cylinder design, effectively prevent the adhesive- material leaking phenomenon caused by the machine vibration or other reasons while the nozzle is under high-speed operation.
  • Adopting graphite bush, improving the wear- resistance, reducing the frequency of using lubrication oil, effectively improve the cleanness of the injection part.
  • Injection cylinder adopts low-frictional seals, improving the response rate and improve the stability under the complicated processes of injection.
  • Bridge-style design, for different L/D ratio plasticizing parts.
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Integrated linear guide rail structure

The injection unit is equipped with the one-piece supporting base which is integrated with linear guide rails, which minimizes the friction to motion, increases injection accuracy and enhances plasticizing efficiency.


New universal screw and barrel unit

The upgraded screw and barrel unit further optimizes color mixing and plasticizing efficiency. It has the advantages of easy color change and cleaning, low shear without temperature rise and wider applicability, etc.

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Anti-tilt platen support design

Special anti-tilt platen support design increases the smoothness of motion, lowers friction, improves the efficiency of motion, reduces energy consumption and prevents the platen from tilting so as to protect the mold.

keplast i1000

Leading KEBA controller

Adopt European KEBA brand controller, which has high-speed response and can realize precise control, making the operation simpler, moulding parameters clear and accurate, and the use efficiency higher.

Learn about TOPSTAR

Guangdong Topstar Technology Co., Ltd. (abbr. Topstar, stock code: 300607) is the first listed core robot enterprise in Guangdong Province. The company was founded in 2007 and is headquartered in Dalingshan Town, Dongguan City, Guangdong Province, with a registered capital of 266 million RMB.

TOPSTAR is a leading manufacturer of injection molding machines in China. We have many types of injection molding machines to choose from, including servo injection molding machines, hydraulic injection molding machines, electric injection molding machines, etc. From the smallest tonnage to the largest tonnage, it can meet customer needs very well. They all have excellent structural design, which can create value for customers efficiently and stably in actual work.

TOPSTAR adheres to the corporate mission of “making industrial manufacturing better” and has long been committed to the innovation and application of industrial manufacturing automation. Through intelligent equipment with industrial robots, injection molding machines and CNC machine as the core, as well as controllers, servo drives, and vision system as three core technologies create an intelligent hardware platform driven by core technologies, and provide manufacturing enterprises with turnkey solutions for smart factories.

Components used in our CNC milling machine

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Injection molding machine: The Ultimate FAQ Guide

If you want to buy injection molding machines to grow your business, then this guide is for you.

It covers everything you need to know about injection molding machines, from working principles, classifications, machine qualifications, advantages, etc.

You will learn everything you need to know in this guide – let’s get started:

Table of Contents

1. What is an injection molding machine?

Injection molding machine is also called injection molding machine or injection machine.

It is the main molding equipment for making thermoplastic or thermosetting plastics into various shapes of plastic products using plastic molding dies.

Injection molding machines are divided into vertical injection molding machines, horizontal injection molding machines, and all-electric injection molding machines.

The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it shoot out and fill the mold cavity.


2. What are the structural components of the injection molding machine?

An injection molding machine is usually composed of an injection system, a clamping system, a hydraulic drive system, an electrical control system, a lubrication system, a heating and cooling system, and a safety monitoring system.
• Injection system

The injection system is one of the most important components of the injection molding machine. Generally, there are three main types: plunger type, screw type, and screw pre-plasticized plunger injection type.

The most widely used is the screw injection system. Its function is that in a cycle of the plastic injection machine, a certain amount of plastic can be heated and plasticized within a specified time, and the molten plastic can be injected into the mold cavity through a screw under a certain pressure and speed. After the injection, the molten material injected into the mold cavity is kept in shape.

Composition of the injection system: The injection system consists of a plasticizing device and a power transmission device.

• Clamping system

The role of the clamping system: the role of the clamping system is to ensure that the mold is closed, opened and ejected products.

At the same time, after the mold is closed, sufficient clamping force is supplied to the mold to resist the cavity pressure generated by the molten plastic entering the mold cavity, and prevent the mold from opening seams, resulting in unfavorable status of the product.

The mold clamping system is mainly composed of a mold clamping device, a machine twisting, a mold adjusting mechanism, an ejection mechanism, a front and rear fixed template, a movable template, a mold clamping cylinder and a safety protection mechanism.

• Hydraulic system

The function of the hydraulic transmission system is to realize the injection molding machine to provide power according to the various actions required by the process, and to meet the requirements of the pressure, speed, temperature, etc. required by each part of the injection molding machine.

It is mainly composed of various hydraulic components and hydraulic auxiliary components, among which the oil pump and the motor are the power source of the injection molding machine.

Various valves control the oil pressure and flow rate to meet the requirements of the injection molding process.

• Electrical control system

The electrical control system and the hydraulic system are reasonably coordinated to realize the process requirements (pressure, temperature, speed, time) and various program actions of the injection machine.

It is mainly composed of electrical appliances, electronic components, meters, heaters, sensors, etc. There are generally four control modes, manual, semi-automatic, fully automatic, and adjustment.

• Heating/cooling system

The heating system of the injection molding machine is used to heat the barrel and the injection nozzle. The barrel of the injection molding machine generally uses an electric heating ring as a heating device, which is installed on the outside of the barrel and is detected in sections by a thermocouple.

The heat of the injection molding machine provides a heat source for the plasticization of the material through the heat conduction of the barrel wall; the cooling system is mainly used to cool the oil temperature. Excessive oil temperature will cause a variety of faults, so the oil temperature must be controlled.

The other location that needs to be cooled is near the feeding port of the feed pipe to prevent the raw material from melting at the feeding port, causing the raw material to fail to be fed normally.

• Lubrication system

The lubrication system provides lubrication for the entire power system of the injection molding machine. The parts of the injection molding machine are constantly moving during the working process and need the support of the lubrication system.

• Safety monitoring system

The safety device of the injection molding machine is mainly used to protect the safety of people and the injection molding machine. 

It is mainly composed of safety door, safety baffle, hydraulic valve, limit switch, photoelectric detection element, etc., to achieve electrical, mechanical, and hydraulic interlocking protection.

The monitoring system mainly monitors the oil temperature, material temperature, system overload, and process and equipment failures of the injection molding machine, and indicates or alarms when abnormal conditions are found.

3. How does the injection molding machine work?

To start injection molding, you need to have a mold first. Injection molds are usually made of metal and are precisely processed to match the characteristics of the products they are going to produce.

Once the mould has been created by the mould-maker, the material for the part is fed into a heated barrel and mixed using a helical shaped screw. Heating bands melt the material in the barrel and the molten metal or molten plastic material is then fed into the mould cavity where it cools and hardens, matching the shape of the mould. 

The cooling time can be reduced through the use of cooling lines that circulate water or oil from an external temperature controller. Mould tools are mounted on plate moulds (or ‘platens’), which open once the material has solidified so that ejector pins can eject the part from the mould.

Separate materials can be combined in one part in a type of injection moulding called a two-shot mould. This technique can be used to add a soft touch to plastic products, add colours to a part or produce items with different performance characteristics.

Moulds can be made of single or multiple cavities. Multiple cavity moulds can have identical parts in each cavity or can be unique to create parts of different geometries. 

Aluminium moulds are not best suited to high volume production or parts with narrow dimensional tolerances since they have inferior mechanical properties and can be prone to wear, deformation and damage due to the injection and clamping forces. While steel moulds are more durable they are also more expensive than aluminium moulds.

4. What can an injection molding machine make?

Injection moulding is used to create many things such as wire spools, packaging, bottle caps, automotive parts and components, toys, pocket combs, some musical instruments (and parts of them), one-piece chairs and small tables, storage containers, mechanical parts (including gears), and most other plastic products available today. Injection moulding is the most common modern method of manufacturing plastic parts; it is ideal for producing high volumes of the same object.
applications injection molding

5. What are the materials used in injection molding?

In plastic injection molding, thermoplastics are one of the most often chosen materials.  Thermoplastics melt under high heat, and can be reheated repeatedly to form new parts over and over before degradation occurs.  Thermoplastics can also be colored with color additives, glitter, and their properties can be altered with specialized additives. These are five thermoplastics that are used most:
There are ten commonly used plastic injection molding materials:
  • Acrylic (PMMA)
  • Acrylonitrile Butadiene Styrene (ABS)
  • Nylon Polyamide (PA)
  • Polycarbonate (PC)
  • Polyethyelene (PE)
  • Polyoxymethylene (POM)
  • Polypropylene (PP)
  • Polystyrene (PS)
  • Thermoplastic elastomer (TPE)
  • Thermoplastic polyurethane (TPU)

materials used in injection molding

6. What is a hydraulic injection molding machine?

Hydraulic injection molding machine is the earliest injection molding machine.
Hydraulic injection molding machines appeared for the first time and once dominated the market, but since the introduction of all-electric machinery in the 1980s, their dominance has been affected.
Hydraulic injection molding machine employ hydraulic cylinders to clamp together two halves of a mold at high pressure. Plastic substrate pellets are then melted, and the liquid is injected into the mold cavity.
Once the plastic has cooled and hardened, the mold halves are separated, the part is extracted, and the process is repeated.
To prevent the mold from being pushed open by injection pressure causing excessive material to “flash” around the parts, the clamping unit must be able to supply enough locking force to keep the mold shut during injection.
Roughly 3-4 tons of clamp force per square inch of cavity is needed for parts with thin wall sections and deep draw depths. For thick wall sections and shallow draw depths, about 2 tons per square inch is needed.

TM Series Articulated Injection Molding Machine Today’s Hydraulic injection molding machine are able to control clamp forces up to and exceeding 8,000 tons and can create parts weighing in at more than 50 pounds. Hydraulic molding is a popular choice for the automotive industry, which requires the production of large, heavy parts such as bumpers.

7. What is an electric injection molding machine?

electric injection molding machine are powered by digitally controlled high-speed servo motors rather than hydraulics, allowing for a faster, repeatable, more precise, and energy-efficient operation.

electric injection molding machine

Electric machine operation is highly predictable, so once a desirable injection process has been reached, it can be replicated very consistently, resulting in higher quality parts. Once a job has been programmed into an electric machine, its digital controls allow it to run virtually unattended , which lowers labor costs and boosts profits.

8. What are the benefits of hydraulic injection molding machines?

Hydraulic injection molding machine is the preferred option for actuating core pulls, ejectors, and valve gates, as well as thick-walled parts that require long hold times. Some of its benefits over all-electric machines include:

  • Greater clamp force for large parts
  • Better injection rates
  • High resistance to wear and tear
  • Larger shot size
  • Better ejection capability
  • Available with gas accumulators to make up for slower clamp movements
  • Lower initial purchase price
  • Low cost and high availability of replacement parts, resulting in lower maintenance costs
  • Easier to control for high-level projects
  • There are many units available on the used market because of this method’s popularity

9. What are the benefits of electric injection molding machines?

Since it poses no risk of oil contamination, electric injection molding machine is well-suited for cleanroom applications. Because of its high precision, this process is also ideal for small- to medium-sized parts and medical products such as Petri dishes and syringes. Other advantages include:

Tight precision and repeatability with reduced scrap rates

  • Cleaner process that never leaks fluid
  • Lower downtime commonly associated with hydraulics
  • Energy savings from 30% to 70%
  • Quieter operation; reduced motor noise below 70 dB
  • Higher rapid injection speeds up to 800 mm/sec and faster clamp motion
  • Shorter startup time and up to 20% faster cycle times
  • Lower unit cost with less material waste
  • Requires no consumables such as oil that would need to be replaced or cleaned
  • Lower power requirements result in significantly lower operating cost

10. What are the disadvantages of hydraulic injection molding machines?

hydraulic injection molding machines because they’re so powerful, hydraulic injection molding machines consume large amounts of energy even when idle. While a typical electric machine may consume about 2.55 kWh during an injection molding process, hydraulic machines may consume 5.12 kWh. They require higher temperatures for molding and more time for cooling, and they’re not ideal for clean rooms because of the risk of fluid leakage.

hydraulic injection molding machines are also noisier and less precise than all-electric presses. However, as clamp forces increase and control systems improve, hydraulic machines’ precision performance also improves.

11. What are the disadvantages of electric injection molding machines?

electric injection molding machine although electric machines are faster, cleaner, and more energy efficient, they are unable to achieve the clamp forces produced by hydraulic injection molding machines and also come with a higher initial cost. They are toggle-clamp machines that are driven by ball-screws, both of which are wear items, and can be expensive to replace or difficult to find on the used market. And, despite lending great precision, the high positioning accuracy of electric machines can make them less forgiving when compared to hydraulic presses.

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