China Injection Molding Plastic Parts manufacturers and Suppliers

Product Description

1. What is Injection Molding Plastic Parts?

Injection molding is the most commonly used method for producing higher volumes of plastic parts.

Rapid Delivery of Youlin® Injection Molding Plastic Parts

Need low-volume parts quickly? Depending on your project requirements, our fast track injection molding can deliver parts in as little as ten days.

Experienced Injection Molding Project Management

Work directly with an experienced team, dedicated to delivering your parts in your timeline. By providing a mold-build schedule and regular project updates, you can depend on timely production with globally competitive pricing.

Injection Molding Production Capabilities

Access cutting-edge tooling manufacturing facilities, including high-speed CNC machines, EDM machines and press machine. These precise tooling operations complement our state-of-the-art injection molding capabilities.

Injection Molding Solutions Across Product Development

For new design verification utilizing our prototyping to production services in our state of the art facilities, we aim to provide end to end product development life cycle solutions. Injection molding is an ideal alternative to 3D printing for parts at a better cost per piece and in materials not available in 3D printing.

2. How to Make Injection Molding Plastic Parts

Injection Molding Plastic Parts

Here is the process of Youlin® injection molding plastic parts works:

1. The polymer granules are first dried and placed in the hopper, where they are mixed with the coloring pigment or the other reinforcing additives.

2. The granules are fed into the barrel, where they are simultaneously heated, mixed and moved towards the mold by a variable pitch screw. The geometry of the screw and the barrel are optimized to help build up the pressure to the correct levels and melt the material.

3. The ram then moves forwards and the melted plastic is injected into the mold through the runner system, where it fills the whole cavity. As the material cools down, it re-solidifies and takes the shape of the mold.

4. Finally, the mold opens and the now solid part is pushed out by the ejector pins. The mold then closes and the process repeats.

5.

The whole process can be repeated very fast: the cycle takes approximately 30 to 90 seconds depending on the size of the part.

After the part is ejected, it is dispensed on a conveyor belt or in a holding container. Usually, injection molded parts are ready to use right away and require little to no post-processing.

3. Advantages of Youlin Injection Molding Plastic Parts

✔ Production Grade Tooling: Production-grade steel tooling with T1 samples delivered within a week. Once your mold is created, we will send ten part samples (T1) for approval.

✔ Broad Material Selection: Choose from dozens of materials including ABS, Ultem, PC/ABS, PEEK, HDPE, PET, TPE, PET, nylon, polyethylene, and more

✔ Precision: Industry-leading delivery on tight tolerance projects

✔ Scalability: Mold prototypes or production runs of millions of parts

✔ Wide Range of Machines: Single, multi-cavity, and family molds; 50 to 1,100+ press tonnage; side actions including hand-loaded cores available

4. Common Materials Lists for Injection Molding Plastic Parts

Material	Description	Benefits	Applications
ABS	Common thermoplastic with good impact resistance and toughness.	● Good impact resistance with toughness and rigidity ● Metal coatings have excellent adhesion to ABS ● Excellent processability and appearance	● Computer housings ● Musical instruments (recorders & plastic clarinets) ● Telecom devices ● Small appliances (enclosures) ● Automotive (interior trim, wheel covers, emblems)
Polypropylene	Thermoplastic polymer used for a wide number of applications.	● Excellent moisture resistance ● Food grades available ● Mold–in hinge possible ● Good impact strength	● Packaging ● Industrial components for fluid ● processing ● Household goods ● Automotive ● Electrical hardware
Polyoxymethylene (POM)	Dimensionally stable thermoplastic with high stiffness and low friction.	● High tensile strength with rigidity and toughness ● Good impact and solvent resistance ● Glossy molded surface ● Low static and dynamic coefficients of friction (slippery) ● Many grades have FDA and NSF approvals on food and water contact ● Replace die-cast metal components	● Mechanical automotive ● Business machines ● Household appliance ● Gears ● Bushings ● Door handles ● Seat belt parts
Polycarbonate	Thermoplastic material with good temperature resistance and impact strength.	● High impact resistance ● Clarity ● Dimensional stability ● Chemical resistance (PC blends)	● Automotive headlights ● Business machines ● Consumer products ● Telecommunications ● Medical products ● Mechanical goods
Polycarbonate / ABS	Blend of PC and ABS that creates strong parts for a variety of applications.	● Good impact resistance with toughness ● and rigidity ● Metal coatings have excellent adhesion ● to ABS ● Very good indoor UV light color stability ● Excellent processability and appearance	● Automotive exterior and interior components ● Medical hardware ● Electrical housings ● Computers ● Monitors ● Business equipment housings ● Enclosures
PVC	PVC is a polymer with good insulation properties, high hardness, and good mechanical properties.	● Wide range of flexibility ● Flame retardant ● Dimensional stability ● Low cost	● Medical/healthcare products ● Automotive applications ● Household items ● Electronic extruded wire covering
Nylon	Polymer material that is durable with high elongation and good abrasion resistance.	● Temperature capability 600°-700° for short term ● Excellent chemical resistance ● High resistance to abrasion ● Tough and withstands repeated impact	● Automotive components ● Bearings ● Electronic connectors ● Gears ● Consumer products ● Industrial products
Nylon 32% Glass Fiber	Polymer with excellent mechanical stiffness and elevated temperature resistance.	-	-
Acrylic (PMMA)	Material with resistance to breakage often used for transparent applications.	● Excellent optical clarity ● Excellent weatherability and resistance to sunlight ● Rigid with good impact resistance ● Good light transmission	● Automotive transparent items such as head/tail lenses and trim ● Household light fixtures and decorative items ● Safety equipment and shields
Polystyrene	Light weight material popular for its high impact strength and toughness.	● Optical clarity ● High gloss ● FDA grades available ● Low cost ● Good dimensional stability ● Good rigidity	● Household goods ● Containers ● Furniture ● Housings ● Packaging
Polyetherimide (PEI)	Thermoplastic with high heat resistance and excellent mechanical properties.	● High heat resistance ● Exceptional strength and impact modulus ● High dielectric strength ● Broad chemical resistance ● Biocompatible ● Excellent machinability and finishing characteristic ● Outstanding processability on conventional molding equipment ● Flame resistance with low smoke evolution	● Commercial aircraft interiors ● Healthcare products ● Cooking utensils ● Fiber optics ● Electrical products ● Electronic parts

5. FAQ

Q: What are the 3 main parts of an injection molding machine?

A: An injection molding machine consists of 3 main parts: the injection unit, the mold - the heart of the whole process - and the clamping/ejector unit. In this section, we examine the purpose of each of these systems and how their basic operation mechanics affect the end-result of the Injection molding process.

Q: How do you identify common injection molding plastic parts defects?

A: Short Shots: Short shots are parts where the plastic did not completely fill out the cavity.

Sink Marks: Sink marks are depressions on the surface of the part. They usually occur in the thicker sections of the part.

Flash: Flash is a thin layer of plastic that flows beyond the parting line of the mold.

Q: What is core and cavity in injection molding?

A: The core is the male part which forms the internal shape of molding. The cavity is the female part which forms external shape of molding.

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