Core and Cavity for Injection Molding
Unlock the secret to flawless injection molding! The little features around the mold that ensure the most perfectly shaped parts...
LDPE Injection Molding Service
RapidDirect delivers custom LDPE injection molding within 5 days. Affordable, high-quality results for every project.
LDPE in Injection Molding
Low-Density Polyethylene (LDPE) is a versatile and widely used thermoplastic in the injection molding industry. Known for its excellent flexibility, toughness, and chemical resistance, LDPE is ideal for a range of applications, including packaging, consumer goods, and automotive components.
At RapidDirect, we offer LDPE in White, ensuring high-quality, consistent material for all your injection molding needs.
| Price: | $$ | Available PA (Nylon) at RapidDirect: | PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black |
|---|---|
| Lead Time: | < 5 days |
| Wall Thickness: | 1mm |
| Tolerances: | ISO2768-C |
| Max Part Size: | 300 mm x 300 mm x 300 mm |
Plastic PA (Nylon) Properties
| Properties | Value |
|---|---|
| Density | 0.910-0.925 g/cm³ |
| Tensile Strength | 8-31 MPa |
| Flexural Strength | Low |
| Impact Strength | High |
| Thermal Conductivity | 0.35-0.5 W/(m·K) |
| Melting Point | 105-115°C |
| Coefficient of Thermal Expansion | 200 x 10^-6 /°C |
| Moisture Absorption | Very Low |
| Chemical Resistance | Good |
| UV Resistance | Poor without additives |
Pros and Cons of LDPE Injection Molding
LDPE plastic offers many benefits that make it suitable for injection molding. However, there are some of its downsides to consider before choosing it for any project.
Pros
- Excellent flexibility and toughness.
- Good chemical resistance and low moisture absorption.
- Cost-effective for high-volume production
Cons
- Poor UV resistance without additives.
- Lower tensile and flexural strength compared to other engineering plastics.
- Requires careful control of processing parameters to avoid defects
Applications of Injection Molded LDPE Parts
Injection molded LDPE parts are widely used across various industries, including:
- Automotive: Engine components, fuel system parts, and under-the-hood applications.
- Consumer Goods: Gears, fasteners, and structural components.
- Engineering: Bearings, bushings, and industrial machinery parts.
- Medical: Surgical instruments, housings, and components for medical devices.
FAQs
Typical processing parameters for LDPE injection molding include a melt temperature range of 170-240°C and a mold temperature range of 20-70°C. The injection pressure should be between 70-140 MPa, depending on the complexity of the part and the flow characteristics of the LDPE material. Cooling time is crucial to ensure proper part formation and can vary based on the part’s thickness and geometry. It is also essential to control the injection speed and hold pressure to avoid defects such as sink marks, voids, and warpage. Pre-drying the material is generally not necessary due to LDPE’s low moisture absorption.
Achieving a good surface finish and dimensional accuracy with LDPE injection molding involves several key factors. Ensuring uniform mold temperature and proper cooling channels helps maintain consistent part quality. Using a mold with a high polish or textured surface can enhance the finish of the final product. Proper gate design and location are critical to controlling material flow and minimizing defects such as weld lines and flash. Maintaining optimal injection speed and pressure during the molding process helps achieve precise dimensions and reduces the risk of warpage or shrinkage.
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