Plastic Injection Filter Nozzle Overview

The injection molding machine filter nozzle is a component of an injection molding machine that is responsible for filtering the molten plastic material before it is injected into the mold. The filter nozzle is typically composed of a filter element and a nozzle tip, which work together to remove any impurities or debris from the plastic material. This helps to ensure that the final product is of high quality and free from defects. The filter nozzle can also help to prevent damage to the injection molding machine by trapping any foreign objects that may cause blockages or malfunctions.

Benefit of Injection Molding Filter Nozzle

The function of an injection molding filter nozzle is to filter impurities and prevent foreign particles from entering the mold cavity during the injection molding process. It is responsible for ensuring a smooth flow of the molten material through the mold, preventing damage to the mold and the product being produced. The filter nozzle also plays a critical role in regulating the temperature of the melt, ensuring that it remains consistent throughout the injection molding process. This helps to ensure that the final product is of high quality and meets the required specifications.

Using a filter nozzle in an injection molding process has several benefits:

1. Better melt quality: The filter nozzle helps to remove impurities and contaminants from the melt, resulting in a better quality final product.

2. Reduced downtime: By filtering the melt, the filter nozzle helps to prevent clogging in the machine nozzle or hot runner system, reducing downtime and improving productivity.

3. Longer tool life: The filter nozzle helps to reduce wear and tear on the machine nozzle, hot runner system and mold by preventing impurities from entering the system.

4. Cost savings: By preventing clogging and reducing wear and tear, the filter nozzle can help save on maintenance costs and increase the lifespan of the molding equipment.

5. Improved consistency: The filter nozzle helps to ensure consistent melt quality, resulting in more uniform parts and reducing the chance of defects.

Injection Machine Nozzle Material

The material selection for injection molding machine filter nozzles depends on the type of resin being used in the molding process. Some of the common materials used for filter nozzles are:

1. Nitriding Steel such as 38CrMoAla, nitriding steel is a popular choice for filter nozzles as it can withstand high temperatures and corrosive materials.

2. Too steel like SKD61, SKD61 material is a high-performance tool steel that offers several advantages, including excellent toughness, high-temperature strength, wear resistance, and machinability. These properties make it an ideal material for use as nozzle material

3. S-136, S136 is a high-performance stainless steel material with excellent toughness and corrosion resistance. It is also known as AISI 420 or SUS 420J2 and is a martensitic stainless steel that contains 12% chromium. S136 is ideal for applications that require high strength and toughness, such as injection molding, plastic mold tooling, and other tool and die applications. It has good wear resistance and can hold a sharp edge. Additionally, S136 has good machinability and is relatively easy to weld.

Ultimately, the material selection for an injection molding machine filter nozzle should be based on the specific resin being used, the temperature and pressure requirements, and the anticipated life cycle of the nozzle.

Filter Element Cartridge Types

Rootier offer various types of fitler elements cartridge for your specific application, mesh type, gap type, and space types.

- Mesh type filter nozzle is designed according to hydrodynamics and try to minimize pressure drop during injection process, also can benefit on polymer plasticizing

- Gap type filter nozzle are widely used to prevent long strip material flow, shearing will be higher comparingly

Applicable and Not Applicable Scenarios 

Filter nozzles can be used in most thermoplastic injection molding applications (such as PE, PP, PS, ABS, PA), but this type nozzle is not suitable for injection molding of shear sensitive materials like PVC

Filter Nozzle Specification and Model Selection