Injection Molding Services

We are leading provider of advanced overmolding, insert-molding and injection molding service China that specialize in offering quality injection molded parts with affordable price to a wide range of industries.
  • Free DFM Feedback and Quote
  • No Minimum Order Quantity
  • Rapid Design Molds within 7 Days
  • Samples as Fast as Two Weeks
  • Tolerances down to +-0.003mm
  • ISO 9001:2015, CE:SHBST100665461231
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Different Types of Plastic Manufacturing & Prototyping

Junying (CNCLATHING) is one of the best mold makers in China, offering plastic parts manufacturing and prototyping solutions for almost every industry. Based on your needs, we can provide 3D printing, CNC machining, and injection molding services for prototypes, and low to high-volume production runs. Take a quick view of the comparison between different processes.

Prototyping (3D Printing) Prototyping (CNC Machining) Composite Mold CNC Machined Tool Steel Mold
Min. quantity 1 1 1 10,000
Typical cost $20-$150 per part $100-$500 per part $30-$200 per part $2000 - $10000 per part
Lead time 2-5 days 5-10days 2-5 days 25 - 35 days

Plastic Mold Design

When designing a plastic mold, some factors should be taken to reduce the cost and complexity of parts.

Design Rules


reduce as many undercuts as possible, including external and internal undercuts, as well as side-action directions. A trick for removing the need for additional slides is creating a pass-thru core.

Wall Thickness:

maintain an even wall thickness to prevent wall sink, thinner walls can reduce cycle time and cost.


the standard draft angle is about 1° to 2°. parts can be designed with a minimum draft angle of 0.5°, or up to 5°.

Rapid Design Molds

The mold in plastic injection molding is a hollow metal block into which molten plastic is injected to form a fixed shape. Many holes are drilled on the mold for temperature control through hot water, oil, or heater. The molten plastic flows into the mold through the gate and fills the cavity through the runner and gate. Then the mold is opened after the cooling process, and the ejector rod of the injection molding machine pushes the top plate of the mold to further eject the mold.

Rapid molds are ideal solutions for part design validation, rapid prototyping, low volume production, and bridge production quantities. If you are looking for a reliable company for small-batch runs of injection molded parts, Junying is providing rapid molds for making inexpensive plastic parts efficiently.

No minimum order quantities
Complex designs accepted
Steel tooling is available
Instant free quote for your parts
Low cost and fast turnaround

How to Make Injection Mold

Injection mold is a tool used for producing plastic parts by the injection molding process, it gives the molded components complete structure and precise dimensions. How to make or manufacture injection mold?

1) Analysis of plastic parts

Before the mold design, the designer should fully analyze whether the plastic products conform to the injection molding processing principle. It includes necessary discussion on the geometric shape, dimensional accuracy, and appearance requirements of the products to avoid unnecessary complexity in mold manufacturing.

2) Mold design

A set of high-quality molds not only needs good equipment and skilled mold-making workers but also a very important factor is good mold design. An excellent mold design has the advantage of low production cost, proper difficulty, and short cycle time and meets the requirements of customers. The design specifies where liquid plastic will enter and flow within the mold's cavity.

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CNC Milling Services

3) Determine mold material and select standard parts

In the selection of mold materials, in addition to considering the accuracy and quality of products, the correct selection should be made in combination with the actual processing and heat treatment capabilities of the plastic mold manufacturer. In addition, in order to shorten the manufacturing cycle, existing standard parts should be used as much as possible.

4) Mold making and assembly

In addition to giving the best structure and reasonable tolerance during the design, the accuracy of the mold is very important for manufacturing and assembly. Therefore, the choice of machining accuracy and machining method plays an absolutely dominant role in mold manufacturing. Using milling, drilling, and turning, a rough shape will be sculpted out of a solid bar of steel or aluminum during the initial machining phase. Subsequently, the final shape will be created through precision machining.

5) Mold trial

For the error caused by the inconsistency between the predetermined shrinkage and the actual shrinkage, whether the demoulding is smooth or not, how the cooling effect is, especially the influence of the size, position, and shape of the gate on the accuracy and appearance of the product, it must be tested through the mold test.

Injection Molding Processes - Types of Injection Molding

From sketch to functional parts, our injection molding services can help you get the final products through multiple molding methods based on applications, materials, sizes, and more factors.
Custom plastic injection molding

A plastic manufacturing process using polymers or plastic resins after being heated, melted and injected under high pressure into an injection mold to obtain molded parts with the desired shape.

Liquid Silicone Rubber Molding

The injection molding of liquid silicon rubber (LSR) to manufacture pliable and durable parts, the process involves mixing together a two-component compound, then heat-cure it in the mold with a platinum catalyst. LSR parts can endure severe temperatures, making them perfect for engine components.


A type of injection molding that consists of multiple steps and is used to form one component made of plastic over the top of another component. A substrate is typically an injection-molded object made of plastic, although it might potentially be made from a wide variety of other materials.

Insert Molding

The process of molding or creating plastic components around other, non-plastic components, sometimes known as inserts, is referred to as insert injection molding. While the inserted component is often a straightforward object, inserts themselves can be somewhat complicated.

What is Injection Molding?

Injection molding (moulding) is the most commonly used manufacturing process for manufacturing plastic parts. It refers to the method that under a certain temperature, the plastic material completely melted by screw stirring is injected into the mold cavity with high pressure, and then cooled and solidified to obtain the injection molded product. This method is really cost-effective and it’s suitable for the mass production of complex shape parts. Molding also has the highest variety of materials, colors, and configurations when compared to CNC machining or even 3D printing. Beyond materials, injection molded parts can have custom cosmetics, polishes, or surface textures. There are mainly six steps in the plastic injection molding process, including clamping, injection, dwelling (molding), cooling, mold opening, and product removal, As shown on the right.

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Injection Molding Materials

When selecting the materials for the injection molding process, there are a ton of options including thermoplastics, thermosets, metals, and elastomers. At Junying, a wide selection of more than 100 thermoplastics and polymers are available, we’ll help you choose the optimal material based on the part and application.
Thermoplastics Other names Properties Applications
ABS Acrylonitrile Butadiene Styrene, Cycolac, Magnum, Novodur, Terluran High rigidity, impact resistance, insulating properties, abrasion and strain resistance Computer housings, toys, appliances, musical instruments, automobile interior trims, wheel covers
PC Polycarbonate, Calibre, Lexan, Makrolon High clarity, impact resistance, dimensional stability Mechanical parts, consumer products, automotive headlights & panels, safety helmets, containers
HDPE High Density Polyethylene, Eraclene, Hostalen, Stamylan Flexible, translucent, weatherproof, good low temperature toughness Houseware items, electronic wire/cable insulators, chair seats, housings, covers
LDPE Low Density Polyethylene, Alkathene, Escorene, Novex Low temperature flexibility, toughness, and corrosion resistance Consumer products, electronic wire insulators, medical parts
PA6 Polyamide 6, Nylon 6, Akulon, Ultramid, Grilon Excellent chemical resistance, abrasion resistance, lowest modulus, low creep, low friction Gears, bearings, electronic connectors, auto parts, industrial components
PA66 Polyamide 66, Nylon 66, Kopa, Zytel, Radilon Excellent chemical resistance, fatigue resistance, almost opaque/white Handles, levers, small housings, zip ties
PBT Polybutylene terephthalate Harsh chemical resistance, low moisture uptake, fire performance, mechanical strength Bearings, gears, surgical instrumentation, manifolds, medical implants
PEEK Polyetheretherketone Harsh chemical resistance, low moisture uptake, fire performance, mechanical strength Bearings, gears, surgical instrumentation, manifolds, medical implants
PEI Polyetherimid High strength, heat and chemical resistance, biocompatible Aircraft interiors, healthcare products, electronic parts, cooking utensils
PET Polyester UV resistance, lightweight, dimensional stability, stiffness Electrical connectors, insulation, consumables and food packaging
PMMA Polymethyl methacrylate, Acrylic Excellent optical clarity, sunlight resistance, good impact resistance Automotive transparent products, household light fixtures, safety equipment
PPA Polyphthalamide Heat and chemical resistance, excellent impact strength, relatively low moisture Automotive applications, housings for high temperature electrical connectors
PP Polypropylene, polypropene, Novolen, Appryl, Escorene Slippery surface, resistant to moisture absorption, heat, chemical, scratch resistance Closures, food trays, caps, toys, handles, housings, bottles, automotive applications
PS Polystyrene Lightweight, resistant to moisture and bacterial growth, insulation Food processing and storage, packing, pulleys, adapters
PSU Polysulfone High operating temperature, good resistance to hydrolysis, toughness Medical and dental parts, surgical instruments, electrical parts
TPU Thermoplastic urethanes Elasticity, transparency, resistance to oil, grease and abrasion Wheels, gears, hose, gaskets, tubing, footwear
POM Polyoxymethylene, Celcon, Acetal, Delrin, Hostaform, Lucel High toughness, impact strength, low moisture absorption Small gear wheels, ball bearings, fasteners, lock systems
Thermosets Properties Applications
Standard silicone Resistance to bacteria, UV light, Ozone, and harmful radiation, light transmittance, glarity Economical production of large series of injection molded articles
Medical-grade silicone Autoclavable, high gas permeability, fast cure, good colorability, low viscosity, good processability Medical devices, healthcare industry
Optical-grade silicone Impact, chemical, UV and temperature resistances Alternative to glass in lighting applications, particularly in bulbs
Fluorosilicone Resists high temperatures, good elasticity at low Temperatures, excellent resistance against automotive fuels and oils Solvent and chemically resistant molded parts, gaskets and membranes for demanding static and dynamic sealing, thin high-precision coatings

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Injection Molding Finishes

What injection mold finish is ideal for your part? We have a variety of surface finishing services for your injection molded parts.
Standard Finish
SPI Finishes
Mold Texturing
Other Textures - VDI
As Molded
Threaded Inserts
Pad Printing
Laser Engraving

Secondary Operations

Laser Engraving

the process of utilizing a laser to etch a picture or logo onto a piece of material of your choice.

Heat Staking

the process of selectively heating a plastic component in order to reconstruct it and insert another component, such as a threaded insert.Pad printing is when an ink-based, two-dimensional design is applied to a three-dimensional surface.


adds colored coatings to molded parts, including coatings for top and bottom, standard colors or Pantone colors, and more.

Ultrasonic Plastic Welding

joining or reforming of thermoplastics employing heat generated by high-frequency mechanical motion. It is performed by transforming high-frequency electrical energy into high-frequency mechanical motion.

Injection Molding Applications

Fabricators use injection molding services to provide affordable and economic plastic products for various industries and fields. Junying is a professional injection molding company that produces typical parts like housings, gears, brackets, and custom plastic injection molded parts for broad uses.

Injection Molding FAQs
1. How much does injection molding cost and how to reduce the cost?

The injection molding process can make low-cost plastic products with a price of $1-5 per unit at high volume, which ranges from 1,000 to 100,000+, but its start-up cost is higher than lots of other technologies. The actual cost of your custom injection molded parts will be affected by the material type, equipment, and more.

To reduce the injection molding cost, here are some tips:

- Reduce risk and quality cost

- Improve efficiency through automation

- Reduce waste

- Shorten cycle time

- Manufacturing more efficient molds

- Reduce mold transfer cost

2. What is the maximum part size for injection molding?

Most standard injection molding machines allow a maximum part size of 4' x 4'.

3. What are common injection molding defects?

Injection molding defects may be caused by the resins, processes, and molds.

- Flow lines or flow marks

- Wrapping

- Burn marks

- Vacuum voids

- Sink marks

- Weld lines

- Jetting

- Discolouration

- Surface delamination

- Short shot

- Flash

- Silver streaking

4. What are your tolerances for molded parts?

Generally, the tolerance can be as low as +/- 0.003 in. (0.08mm), with a resin tolerance that can be greater than but no less than +/- 0.002 in./in. (0.002mm/mm).

5. What is the difference between forming and molding

Molding or moulding is a manufacturing process that involves shaping a raw material that is either liquid or pliable by employing a rigid frame known as a mold or matrix. It's possible that this was constructed using a pattern or a model of the thing that would ultimately be created.

Forming is the process of changing the shape of a product that is only partially finished, such as sheet metal, by the use of plastic deformation. The process of shaping a piece of sheet metal involves applying force to the item in order to modify its shape rather than removing any material.

Both molding and forming shape the material while not removing any of it, but molding is done using a mold, and forming is completed through suitable stresses such as compression, shear, and tension.

Tooling & Mold Making Service Online – Best Injection Molding Manufacturer Company In China

CNCLATHING is one of the best mold makers in China, offering molding solutions for every industry, including medical injection molding, electrical injection molding, automotive injection molding and more. In order to meet our clients’ large demand for plastic parts, we cooperate with reliable partners to offer injection molding services, which can make up for your one-stop requirements for plastic prototype and mass production. Our main services offering include insert-molding, overmolding & two color injection molding, as well as with CNC machining. With more than 10 years of experience, we are able to produce custom affordable injection molding parts plastic, insert molding parts and overmolding parts according to customers’ specifications, drawings or samples. We own advanced techniques, highly skilled staff that employ superior tooling and high pressure injection molding processes to ensure that the mold parts are of the cheapest price and highest quality. Whether you need rapid tooling, mass production mold making with tight tolerances, our team of experienced specialists can offer a cost-effective solution at each stage. Contact our expert team and get a price for your tooling/mold making service, we will quote you a plastic injection mold price in 24 hours!

Why Choose Our Injection Mold Making Services

There are huge numbers of mold making companies. Why should you choose us as your tooling & injection molding supplier? Here are the reasons:

  • High production capability and competitive prices for injection molding service are offered.
  • We have rich injection mold manufacturing experiences for over 10 years and earned a good reputation.
  • Exceptional customer service and communication.
  • Multiple of plastic injection mold designs & types – 3D printed injection mold, Insert mold, Overmold & Two-color mold (work in with CNC machining service) are available to meet custom needs.
  • Do precision injection molded parts manufacturing according to your drawings or samples.
  • Finish the parts with service of mold making in time to provide the strongest support for your R&D projects.
  • Our automated quoting, design analysis, and manufacturing process allows us to ship injection molding orders in as fast as 1 day.
  • We have advanced production equipment and facility, technology and materials to make the most precise injection mold plastic as well as great aspect.
  • We have the most experienced engineers and tooling partners that will really make a difference in your lead times, costs and final quality.
  • Cooperative Supplier Collaboration Project
  • In order to realize our customers’ large demand for plastic parts
  • We and our partner provide this service together
  • Can make up for your one-stop needs for plastic proofing and mass production

Capabilities Of Injection Molding Service At Junying

1.Custom Insert Molding

CNCLATHING also offers insert molding as part of its injection molding capabilities that works especially well for parts that have threaded holes. With our custom insert molding service, you can make parts all at once instead of having to do assembly after the fact. And insert molding service will help you reduce costs, lower the size and weight for the part, and improve reliability. Insert molding materials including ABS, PPS, PS, PSU, PEEL, Liquid Silicone Rubber, Polypropylene, Polycarbonate, PMMA, PEI, PPA, LCP, etc.

How does insert molding work?

It uses a preformed part that is loaded into a mold where it is then overmolded with a thermoplastic resin to create a final component. When the run is complete, parts are boxed and shipped shortly thereafter.

Advantages of our insert molding service:

  • Durability: Metal inserts will guarantee the function of threads and mitigate wear and tear over the part’s life.
  • Strength: Because it’s a “one-shot” process, insert molding can produce stronger parts than overmolding and other processes.
  • Creating production parts: Insert molding is great for creating prototypes and production parts.

2.Overmolding Service

Overmolding is a multi-step injection molding process where two or more components are molded over top of one another. It’s sometimes referred to as two-shot molding because it is a two-step process. Using overmolding service allows us manufacture products with multiple materials and/or colors relatively simply and can be used for a range of applications including medical, automotive, military and more. Junying has the expertise to make sure your overmolding project is a success. Work with us to create the ideal solution for your exact needs. No matter what the specifications of your project, we will meet the expectations of your next overmolding project!