The 70/90/110 extrusion manual screen changer is installed between the extruder and extrusion die head. It holds the screen pack used to remove contaminants and unmelted particles from molten PE before the material enters the die.

Adapters and connectors can be configured according to the extrusion line layout and connection dimensions. The manual design allows operators to remove and replace the screen pack when pressure increases or filtration performance declines.

Features of the 70/90/110 manual screen changer

The screen changer removes contaminants and unmelted particles before the polymer enters the extrusion die head, helping reduce black spots, gels and downstream die contamination.

Its manual screen-holder design allows operators to remove and replace the screen pack without dismantling the complete extrusion connection.

The connection structure can be matched with suitable adapters and joints according to the layout of the extruder and die head.

Applications

The 70/90/110 manual screen changer is designed for PE film extrusion lines that require periodic screen-pack replacement. It can be used in production where contaminants, degraded polymer or unmelted particles must be removed before the melt reaches the die head.

Before selection, confirm the polymer, extruder size, target output, operating pressure and connection dimensions.

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Bojing extruder filter and extrusion filter are designed to ensure smooth, stable, and high-quality extrusion performance. The extruder filter is used to filter impurities from raw materials, effectively removing contaminants and preventing defects in the final product. Engineered for precision and durability, our filters reduce downtime, improve production efficiency, and extend equipment life. Suitable for plastic, rubber, and other materials, Bojing’s extrusion filters deliver consistent output and reliable performance, helping your extrusion line achieve optimal results and superior product quality.

The extruder filter screen is one of the indispensable parts of the film blowing machine, and its main function is to filter the impurities in the plastic raw materials, such as dust, not melted completely plastic particles, etc., and to avoid these impurities causing slippage or irreversible damage in the die head. The function of the extrusion filter screen in addition to filtering the impurities in the plastic raw materials, can also increase the friction resistance between the screw and the plastic raw materials in the extruder, and increase the back pressure at the same time to help achieve the complete mixing of raw materials.

THE INSTALLATION OF EXTRUDER FILTER

Purchase a extruder filter with the right size for the screw and die head

The extruder filter connects the screw and die head through the connector

WHAT IS AN EXTRUDER FILTER USED FOR?

Feeding: The three passes of the film blowing machine can add different kinds of materials to the extruder filter film material, such as color masterbatch, anti-static agent, plasticizer, etc. These materials can improve the flexibility and barrier properties of the film, and enhance the stability and durability of the film.

Exhaust: The film blowing machine will produce a certain amount of air or water vapor during the production process, if not discharged in time, it will affect the quality of the extruder filter film. Another function of the tee of the film blowing machine is to discharge these impurities, so as to ensure that the quality of the blown film is more stable.

Pressure adjustment: The three passes of the film blowing machine can also be adjusted for pressure to ensure the uniform thickness of the blown film. In the process of blowing the extruder filter film, the thickness of the film will fluctuate due to the influence of environmental, material and other factors. The tee of the film blowing machine can ensure the uniform thickness of the blown film by adjusting the pressure.

WORKING PRINCIPLE OF EXTRUDER FILTER

Extruder filters are essential components in plastic extrusion processes, used to remove contaminants and impurities from the molten plastic material. They ensure the quality and consistency of the final product.

Material Flow: The molten plastic material flows through the extruder barrel and is pushed towards the die head.

Filtering: The material passes through the filter screen or element, which is typically made of metal mesh or a porous material. Contaminants, such as foreign particles, gel particles, and degraded material, are trapped within the filter.

Clean Material: The filtered, clean material then flows through the die head and is extruded into the desired shape.

APPLICATIONS OF EXTRUDER FILTER

Packaging films: Used to remove impurities from materials used to produce packaging films like polyethylene terephthalate (PET), low-density polyethylene (LDPE), and high-density polyethylene (HDPE).

Food packaging: Used to filter materials used in food packaging to prevent contamination.

Medical devices: Ensures the cleanliness and safety of materials used in medical devices.

Pharmaceutical products: Removes contaminants from materials used in pharmaceutical production.

Automotive: Removes impurities from materials used in automotive components.

Electronics: Used to filter materials used in electronic components.

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The IBC die head can effectively increase the production capacity of the product, and is a highly recommended choice for guests who want to increase the production volume of the film. In addition, the total plastic film extrusion production capacity of the product can be effectively increased through the combination of different design of wind rings.

BENEFITS OF IBC LDPE DIE HEAD

Roundness, concentricity, perpendicularity

Perfect film thickness tolerance

High pressure output (according to customer demand)

Simple cleaning and maintenance

Fast refuelling and color change speed, reduce raw material consumption

Internal and external cooling systems

Appropriate pressure release

Provide suitable plastic retention time

The flow rate between channels is equal

PROCESS OPTIMIZATION OF IBC LDPE DIE HEAD

Initial Inquiry

Technical Confirmation & Recommendations

Drawings

Manufacturing & In Process Quality Control

Final Quality Control

Packing & Shipping

WHAT IS PLASTIC FILM EXTRUSION?

Plastic film extrusion is a manufacturing process used to create thin, flexible plastic sheets. It involves heating plastic resin, forcing it through a die, cooling it, and winding it onto rolls.

Common types of plastic films include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and nylon. These films have various applications like packaging, agriculture, construction, and medical fields.

Polyethylene films are popular due to their versatility, durability, chemical resistance, and heat sealing properties. They are used in packaging, consumer goods, agriculture, and construction.

WHAT IS THE PROCESS OF PLASTIC BLOWN FILM EXTRUSION?

plastic blown film extrusion is a manufacturing process used to create thin, tubular plastic films. Here's a breakdown of the process:

Resin Feeding: Plastic resin is fed into the polythene film extruders hopper.

Heating: The resin is heated to a molten state.

Extrusion: The molten plastic is forced through a circular die, forming a tubular parison.

Inflation: Air is blown into the parison, causing it to expand and form a bubble.

Cooling: The bubble is cooled to solidify the plastic.

Collapsing and Winding: The bubble is collapsed and wound onto a roll.

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The HDPE Extruder Die Head can produce medium-thickness thin films and film bags. It is mainly through low speed flow and less heat energy to directional stretch forming, so as to obtain the polyethylene extruder die head. The HDPE die head is characterized by low cost and wide applicability in polyethylene blown film extrusion, and can produce some packaging films commonly used in daily life, such as shopping bags, garbage bags, storage bags, etc.

HDPE EXTRUSIONS APPLICATIONS

1. Bottles and Containers: HDPE Extrusions is commonly used to produce milk jugs, detergent bottles, and other containers for liquids.

2. Pipes and Fittings: HHDPE Extrusions are used for water supply, sewage, gas distribution, and industrial applications due to their durability and resistance to corrosion.

3. Irrigation Systems: HDPE Extrusions and tubing are used in irrigation systems for their flexibility and resistance to chemicals.

4. Toys: Many children's toys are made from HDPE due to its safety and durability.

5. Household Items: Products like cutting boards, storage bins, and laundry baskets are often made from HDPE.

6.Furniture: Outdoor furniture, such as chairs and tables, are made from HDPE Extrusions for their weather resistance.

HDPE EXTRUSIONS PROPERTIES

High Strength-to-Weight Ratio: HDPE extrusions are strong and durable, yet lightweight.   

Excellent Chemical Resistance: HDPE Extrusions are resistant to a wide range of chemicals, including acids, alkalis, and solvents.   

Good Impact Resistance: HDPE extrusions can withstand impacts and shocks without breaking.   

Low Water Absorption: HDPE Extrusions have low water absorption properties, making them suitable for outdoor applications.

Good Processability: HDPE is easy to process through extrusion, making it a versatile material for various shapes and sizes.   

Excellent Weldability: HDPE can be welded using various techniques, including heat fusion and butt fusion.

KEY CONSIDERATIONS FOR HDPE DIE HEAD

In the process of blowing film, it is very important to choose the right die head, we need to choose the die head from the following aspects:

The die head is selected by the material used.

The thickness of the blown film is different: the thinnest LDPE die head can blow a film of 0.003mm thick, while the thinnest HDPE die head can blow a film of 0.02mm thick.

Product quality is different: the transparency, strength and toughness of the film blown by the LDPE extrusion die head are better than the film blown by the HDPE die head.

Different production costs: The production cost of the film blown by the LDPE extrusion die head is higher, while the cost of the HDPE die head is relatively low.

WHAT IS A HDPE EXTRUSIONS DIE HEAD USED FOR?

Some packaging films commonly used in daily life such as shopping bags, garbage bags, storage bags, etc.

The production of thicker film or some less demanding packaging film.

WHAT IS THE DIFFERENCE BETWEEN PVC EXTRUDER AND POLYETHYLENE EXTRUDER?

PVC and polyethylene extruders differ primarily in the materials they process and their specific requirements. PVC extruders often use twin-screw designs to handle the material’s higher viscosity and require lower processing temperatures (160-200°C) to avoid degradation. They also need more additives like stabilizers and plasticizers. Polyethylene extruders, typically single-screw, handle materials like HDPE and LDPE, which have lower viscosity and require higher processing temperatures (180-250°C). PE extruders generally need fewer additives and simpler cooling systems. Die designs and cooling/calibration methods also vary to accommodate the distinct flow characteristics and stability needs of each material.

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