Plastic medical part

Injection Molding Cleanroom

What is Injection molding cleanroom

Injection molding cleanroom refers to a controlled environment specifically designed and maintained for the manufacturing of plastic components using injection molding processes. These cleanrooms are essential for industries that require high levels of cleanliness and precision, such as medical, pharmaceutical, electronics, and aerospace sectors.

Key characteristics and features of an injection molding cleanroom include:

  1. Cleanroom Classification: Medical Injection molding cleanroom adhere to specific cleanliness classifications based on international standards, such as ISO 14644-1. These classifications determine the allowable limits of airborne particles per cubic meter of air, ensuring a controlled environment with low levels of contamination. Cleanrooms are typically classified as ISO Class 5 or higher for injection molding applications.
  2. Environmental Control: Injection molding cleanrooms incorporate advanced environmental control systems to maintain the desired cleanliness levels. These systems typically include high-efficiency particulate air (HEPA) filters, air pressure differentials, and temperature and humidity control to minimize the presence of airborne particles and ensure optimal manufacturing conditions.
  3. Gowning and Personnel Hygiene: Strict gowning procedures and personnel hygiene practices are enforced within injection molding cleanrooms to prevent contamination. Cleanroom personnel are required to wear specialized garments, including cleanroom suits, gloves, masks, hairnets, and shoe covers. Handwashing and sanitization protocols are rigorously followed to maintain cleanliness.
  4. Material Handling and Preparation: Raw materials used in injection molding are handled and prepared within the cleanroom environment to prevent contamination. Controlled storage and transportation of materials are implemented, and specific protocols are followed to maintain material cleanliness. Material drying, conditioning, and mixing may also be conducted in dedicated cleanroom areas.
  5. Cleanroom Equipment and Machinery: Injection molding machines used in cleanroom environments are designed and maintained to meet the cleanliness requirements. These machines may feature additional enclosures, laminar flow hoods, or barrier systems to minimize the risk of particle generation during the molding process. Regular cleaning and maintenance of the equipment are essential to uphold cleanliness standards.
  6. Mold and Tooling Preparation: Molds and tooling used in injection molding are prepared and maintained within the cleanroom environment. Proper cleaning procedures, including solvent cleaning, ultrasonic cleaning, or specialized cleaning agents, are employed to eliminate contaminants. Mold storage and handling are carefully managed to prevent particle accumulation.
  7. Process Control and Quality Assurance: Injection molding cleanrooms implement stringent process control measures to ensure consistent quality and minimize defects. Critical process parameters, such as temperature, pressure, injection speed, and cooling time, are closely monitored and controlled. In-process inspections, dimensional measurements, and quality checks are performed to verify product quality and compliance with specifications.

Injection molding cleanrooms are crucial for industries that demand high-quality, precision-molded components. By providing a controlled and clean environment, these cleanrooms minimize contamination risks, ensure product integrity, and meet stringent regulatory and industry standards. The combination of environmental control, personnel hygiene, material handling, and process control measures in an injection molding cleanroom contributes to the production of reliable and high-quality plastic components.

Sometimes a Plastic mold company is looking for good niche products that related their business and they could earn more profits. Such was the case for SINCERE TECH a well-known plastic mold manufacturer that is now inverted molding shop in a 5,000 -sq Class 10,000 injection molding cleanroom which is especially for medical injection molding service.

injection molding cleanroom

injection molding cleanroom

Located in Dong Guan China, a small town in the Dong Guan City of China near the Shenzhen airport, SINCERE TECH has a reputation for complicated, high-precision molds, medical molding, automobile mold and a particular specialty in multi-component molds. After 2000 China has become mold manufacturing country on the world and lots of tool-making companies started their mold business, in 2005 the SINCERE TECH started plastic mold manufacturing business to make export molds, primarily of shorter runs for customers of its tool-making business.

Staying with what worked, when SINCERE TECH was set up as a plastic molding facility by a wall divided from the plastic mold making shop, it was designed around what the mold customers were doing. That way it could handle customers’ short lead time, benefits for mold maintaining, and so on. Since molds were mostly made for technical and multi-material or colored parts, the molding company configured with high-precision injection molding machines and multi-component technologies. Molding presses range from 60 to 2000 tons and include two-shot injection molding machines. you can go to our double injection molding parts page.

Medical Plastic Injection Molding Products Needs Injection Molding Cleanroom 

Several of our customers were in medical equipment which needs medical molding parts, automotive industry, health care industry and pharmaceutical manufacturers. to provide a custom solution for all of our customers, ST decided to set up an injection molding cleanroom manufacturing (for medical injection molding service) operation at a Class 10,000 level with turbulent airflow. Plastic molding parts made include dialysis machine components, medical machinery components, closures for PE infusion bottles, and medical plastic caps and some of other medical injection molding parts

medical plastic parts

medical plastic parts

The ways of using injection molding machines in a cleanroom environment are too numerous to count. There are hoods over individual machines, machines completely in the cleanroom environment, and machines partially in the molding cleanroom itself.

ST decided to put only the clamp end of the machine in the clean room injection molding, “We considered the particular characteristics of the machines in all our planning.” ST chose some of the high precision Series injection machines, including 65-, 80-, and 110-ton machines to cover its product range, this machines seems working perfectly as we thought at the beginning,

Full-service Plastic mold making, normally molding and Cleanroom

ST did not set up the injection molding cleanroom to simply molded parts. That would not have fit with the level of service expected by the medical plastic molding requirement of customers. Such customers generally specify medical degree for all of the molding equipment, packing, assembly, and shipments, to complete this task, ST operates an assembly room within the Class 10,000 cleanroom so that the finished product leaves in hermetically sealed packages ready for shipping.

For normal requirements, we have a range of machines from 80 tons to 2000 tons to produce a wide range of products for our customers.

This quality and service have led the business more growth, in both the cleanroom business and the rest of the molding operation referred to as the Technology Center. Today our plastic molding company area increased from 6,000 sq to 12,000 sq. The cleanroom is expanded from 2050 sq to 4400 sq

At Sincere Tech China mold manufacturer, we understand the importance of custom injection molding and its role in achieving manufacturing excellence. With our expertise in the field, we offer top-quality custom injection molding services that meet the highest industry standards. Our team of skilled professionals, state-of-the-art equipment, and commitment to innovation ensure that we deliver exceptional results for your specific needs.

When you partner with us, you can expect a seamless and efficient manufacturing process. From the initial design phase to the final production, we pay meticulous attention to detail, ensuring that every product meets your exact specifications. Our experienced engineers work closely with you, providing valuable insights and recommendations to optimize the design for injection molding, resulting in cost-effective solutions without compromising on quality.

We leverage the properties of plastics material to create products that are not only good surface finish but also tight tolerance. This translates to reduced waste rate costs, improved energy efficiency, and enhanced user experience. Whether you require consumer goods, automotive components, electrical enclosures, medical devices, or industrial parts, our custom injection molding capabilities cater to a wide range of industries and applications.


At Sincere Tech Plastic Mold company, we are committed to staying at the forefront of the industry and embracing future trends and innovations. We constantly explore advanced materials and composites that offer enhanced performance and sustainability. Our continuous investment in research and development enables us to offer cutting-edge solutions that meet the evolving needs of our customers. We are one of the best mould suppliers in China.

Furthermore, we are dedicated to environmentally friendly practices. We actively seek out sustainable alternatives, such as biodegradable polymers and recycling initiatives, to minimize the environmental impact of our manufacturing processes. By choosing our custom injection molding services, you can align your brand with sustainable manufacturing practices and contribute to a greener future.

Quality is our utmost priority, and we adhere to stringent quality control measures throughout the entire manufacturing process. Our state-of-the-art facilities and skilled technicians ensure that each product undergoes rigorous inspection and testing, guaranteeing exceptional performance, reliability, and customer satisfaction.

Partner with Sincere Tech China mold maker for your custom injection molding needs, and experience the highest level of professionalism, expertise, and innovation. We are dedicated to helping you bring your ideas to life, delivering superior products that excel in performance, durability, and cost-effectiveness.

Contact us today to discuss your project requirements and discover how our polypropylene injection molding services can elevate your manufacturing processes to new heights. Together, let’s unlock the full potential of polypropylene and create exceptional products that shape the world around us.

Still have a question? Welcome to contact us and send us an email.

Plastic molding manufacturing

Plastic Molding Technology

The History of Plastic Molding Technology

The history of plastic molding technology is a fascinating journey that spans several decades, marked by significant developments and innovations. Plastic molding refers to the process of shaping plastic materials into a desired form using a mold or die. Here’s a brief overview of the key milestones in the history of plastic molding technology:

  1. Early Developments (Late 19th Century):
    • The first synthetic plastic, Bakelite, was developed by Leo Baekeland in 1907. Bakelite was initially used for electrical insulators and later found applications in various industries.
    • Injection molding, the most widely used plastic molding process today, saw its initial concept in the late 19th century, but it wasn’t until the 1930s that it became a practical manufacturing method.
  2. World War II Era (1930s-1940s):
    • The demand for mass-produced, lightweight components during World War II accelerated the development and adoption of plastic molding technologies.
    • Injection molding gained prominence during this period due to its ability to produce complex and precise parts in large quantities.
  3. Post-World War II Advances (1950s-1960s):
    • The 1950s saw the commercialization of various plastic materials like polyethylene, polypropylene, and PVC, expanding the range of possibilities for plastic molding.
    • Blow molding, a process for creating hollow objects such as bottles, became popular during this era.
  4. Rotational Molding (1940s-1950s):
    • Rotational molding, also known as rotomolding, emerged in the 1940s and gained traction in the 1950s. This process involves rotating a hollow mold with powdered plastic inside to create a uniform coating on the interior.
  5. Thermoforming (1930s-1950s):
    • Thermoforming, a process where a plastic sheet is heated and molded into a specific shape, gained popularity in the 1930s and 1940s.
  6. Computer Numerical Control (CNC) Integration (1970s-1980s):
    • The integration of computer technology in plastic molding machines, known as CNC, enhanced precision and control in the molding process.
  7. Advancements in Materials and Techniques (1990s-Present):
    • Continuous advancements in plastic materials, additives, and molding techniques have allowed for greater versatility, durability, and efficiency in plastic molding processes.
    • 3D printing technologies have also influenced plastic molding, offering new possibilities for rapid prototyping and low-volume production.
  8. Sustainability and Innovation (Recent Years):
    • In recent years, there has been a growing emphasis on sustainable practices in plastic molding, with increased interest in biodegradable and recycled materials.
    • Advanced manufacturing technologies, such as Industry 4.0 concepts, are being integrated into plastic molding processes for improved efficiency and quality control.

The history of plastic molding technology is characterized by a continual evolution driven by technological advancements, material developments, and the changing needs of various industries. Today, plastic molding plays a crucial role in the production of a wide range of products across numerous sectors.

Plastic molding technology continues evolving with the market and with the advances in science. Plastic molding is the process used in producing plastic components for a variety of industries.

plastic molding technology

When plastic resin materials are heated the resin will flow, and can then be injected into a mold. A plastic mold consists of two halves referred to as the “A” side (cavity side) and the “B” side (core side). The “A” side is where the molten plastic enters the mold, and the “B” side contains the ejector system which removes the parts from the mold.

Advancements of plastic molding technology

Advancements in plastic molding technology have been significant, driven by innovations in materials, processes, and machinery. Some notable advancements include:

  1. High-Performance Materials:
    • The development of new and advanced plastic materials with enhanced properties, such as high strength, heat resistance, and durability, has expanded the application range of plastic molding.
  2. Biodegradable and Sustainable Plastics:
    • With increasing environmental concerns, there has been a focus on developing biodegradable and sustainable plastics. Manufacturers are exploring materials derived from renewable sources or those that can easily decompose, reducing the environmental impact of plastic products.
  3. Advanced Injection Molding Techniques:
    • Micro-injection molding allows for the production of extremely small and precise plastic components, opening up new possibilities in fields like electronics and medical devices.
    • Multi-material and multi-color injection molding enable the production of complex parts with different materials or colors in a single manufacturing cycle.
  4. Additive Manufacturing and 3D Printing:
    • The integration of 3D printing technologies into plastic molding processes has facilitated rapid prototyping, tooling development, and low-volume production. This allows for faster product iterations and reduced time-to-market.
  5. Industry 4.0 Integration:
    • The incorporation of Industry 4.0 principles, including smart sensors, data analytics, and connectivity, into plastic molding machines has improved automation, real-time monitoring, and overall efficiency in production processes.
  6. In-Mold Decorating and Labeling:
    • In-mold decorating (IMD) and in-mold labeling (IML) techniques allow for the integration of graphics, textures, and labels directly into the molded plastic parts during the manufacturing process. This enhances product aesthetics and eliminates the need for additional post-processing steps.
  7. Gas-Assisted Injection Molding:
    • Gas-assisted injection molding involves injecting a controlled volume of gas into the molten plastic to create hollow sections within the molded part. This technique is used to produce lightweight components with improved strength and reduced material usage.
  8. Foam Injection Molding:
    • Foam injection molding produces lightweight, rigid, and cost-effective parts by injecting gas or chemical blowing agents into the plastic melt. This process is particularly useful for automotive and packaging applications.
  9. Insert Molding and Overmolding:
    • Insert molding involves placing metal or plastic inserts into the mold before injection, creating a part with integrated components. Overmolding involves molding one material over another, providing benefits such as improved grip, aesthetics, and functionality.
  10. Liquid Silicone Rubber (LSR) Molding:
    • LSR molding is used for producing flexible and durable rubber-like parts. It is commonly used in medical devices, automotive components, and consumer goods.
  11. Robotic Automation:
    • The use of robotics in plastic molding processes has increased precision, speed, and efficiency. Robots are employed for tasks such as part handling, assembly, and quality control.

These advancements collectively contribute to the evolution of plastic molding technology, making it more versatile, efficient, and environmentally friendly. The ongoing focus on innovation continues to shape the future of plastic manufacturing processes.


Plastic Molding Includes Many Terms and Components

Plastic molds are required to have many components in order to make high-quality plastic parts. Below is some of the terminology used to describe the components and processes that are required when producing injection molded parts:

  • Sprue – this connects the nozzle of the injection molding machine to the main runner, or cavity
  • Runner – this component conveys the melted plastic from the sprue to the gate and into the part
  • Gates – these are the openings that allow the molten plastic to be injected into the cavities of the mold
  • Cold Runner mold – this design involves the plastic entering into the “sprue” and then traveling through the “runner” where it then enters the part cavities through the various “gates.”
  • Hot Runner mold – this design is an assembly of heated components used to inject molten pPlastic moldslastic into the cavities of the mold. Hot Runner mold usually makes mold more expensive to manufacture but allow savings by reducing plastic waste and reducing the cycle time.

When observing plastic molding products, you will often see a line running between different sides of the finished plastic part. Here are some descriptions of why parts have a specific appearance:

  • The Parting Line – this occurs anywhere there are any two pieces of mold that meet.

There are also several configurations of plastic molds. These configurations are described as


  • The Two Plate Mold – consists of one parting line where the mold splits into two halves.  The sprue, runners, gates, and cavities are all on the same side of the mold.
  • The Three Plate Mold – has a runner plate in between a moving half and a fixed half.  These molds will have two parting lines and are used because of their flexibility in gating locations.
  • An Unscrewing Mold – is what is used when there is a requirement for male or female threads on a plastic component
  • The Action Mold – these consist of a mechanical cam action incorporated in their design, when a hole, slot, undercut or thread is needed that is not perpendicular to the parting line.
  • The MUD Unit Mold– these are standard frameworks for toolsets (u-frame), which allow for custom-machined tooling inserts to be made for specific components.

Large Plastic Molding Runs Cost Less 

Plastic injection molding offers many industries a huge number of benefits.  In large runs, molding is much cheaper than when machining the parts individually. The over-all manufacturing speed is much faster with this approach as well. This is one of the many reasons there are so many different types of injection molding processes. Some of these include:

Cold runner mold

Insert Molding – This is the process of putting a metal insert into a mold and then molding plastic around the insert.  Since multiple parts are manufactured together – this eliminates the need for a secondary assembly operation.

OverMolding – This is the process of over-molding, and the production of injection molded parts that seamlessly combines a rigid plastic with a rubber-like elastomer.

Family Molding – This is a process that utilizes a mold that contains various shapes of cavities to mold all the plastic components for one completed part.  Family molds are used when the different plastic components are made from the same material.

Injection Molding CleanRoom – This is the process used primarily for medical components. It is the injection molding process that is performed in a cleanroom environment in order to protect the parts from any contaminants.

When considering having plastic parts custom designed and molded – SINCERE TECH is the ideal partner for your plastic component or device.

SINCERE TECH is a China mold maker, which is  your single-source solution for your device by providing mold building, design, and engineering, injection molding as well as injection molding cleanroom and any secondary operations that may be required to complete your project. contact us now to know more information