1. Structure of plastic injection machine screw

      Screws are an important part of the plastic injection molding machine, together with the cylinder, they are used to create pressure and push the plastic into the mold to shape the product.

      The effect of plastic injection machine screw"

• Take plastic from neck to cylinder plastic
• Compress the plastic, increasing the pressure on the plastic stream
• Inject the resin (push the resin) into the nozzle.
• The function of mixing plastic when producing colored plastics increases the color stability of the product.

Common screw type

The common type includes 3 working areas: Plastic extraction area, plastic transfer area, plastic compression area.

Specially designed screws

• Type with additional spiral grooves: To increase the ability to mix plastic, it will create turbulent flows to help mix plastic better.

 

• Type with additional plastic mixing parts: These parts increase the ability to mix plastic, which will be better than the 2-spiral type.

• Disc screw type: Designed specifically for molding machines with very high precision, using micro-plastic. 1 shot is about 1g of plastic.

2. Manufacturing range

• Diameter from: D12mm –  D200mm
• Lenght: 350~ 5000 mm

3. Application

• Glass content in plastic 0%GF to 65%GF.
• The type of plastic that the customer uses
• Non-corrosive plastic: PET, PP, PC, ABS…
• Corrosive plastic: PA, PA6. PA9T, PPS, LCP…
• High-viscosity transparent plastic: clear PC, colored PC.
• High hardness plastic: Bakelite.

4. Manufacturing method

 

4.1 Hard alloy screw

Using high strength alloys, heat treated in a vacuum environment, creating products with the highest mechanical properties of carefully selected steels for manufacturing. Important parts of the components are reinforced with special alloys to increase component life.

 

4.2 PTA (Plasma Transferred Arc) top welding screw

The screw shaft tip is welded by PTA welding method, because of using Plasma welding method, the welding powder layer has better mechanical properties than the base material. Strengthening the mechanical properties of the screw shaft, increasing the wear and corrosion resistance of the screw shaft tip. Many different types of alloy powder can be used to match different types of plastic because each type of plastic has different abrasive properties and corrosive chemicals.

4.3 HVOF (High Velocity Liquid Fuel) Spray Screw:

HP/HVOF bimetallic spray coating is a thermal spray technology used to improve or enhance the properties of screw surface such as corrosion resistance, high temperature oxidation resistance, insulation, thermal conductivity, wear resistance, prolonging product life.
The alloy powder is melted and sprayed at high speed (700-1500mm/s), creating a coating on the base steel surface, with high hardness, better corrosion and abrasion resistance than the base material.

4.4 3D printing screw (Fiber Laser):

Using a laser to melt the alloy powder to print on the surface of the component, covering the working area of ​​the component with a layer of alloy powder with high mechanical properties.

4.5 Sintering screw: Hot Isostatic Press (Only applicable to small components)

Using sintering technology to manufacture components by the method:
Hot Isostatic Pressing (HIP) is a manufacturing process used to reduce the porosity of metals and increase the density of many materials. This improves the mechanical properties and workability of the material. Because the material is of high purity and the material properties can be selected through the composition of the metal powder, it is the best technology to deal with difficult-to-use halogen-free plastics.

5. Product supply process

Step 1: Please send us a quote request including the following information:

• Full model name or model photo
• Component diameter and length specifications.
• Use plastic models or plastic packaging photos to select appropriate materials and component manufacturing technology.

Step 2 ASG Vietnam sends quotation to you.

Step 3: Customer send order.

Step 4: In most cases we have manufacturing drawings, in some cases we do not have drawings, we will come to your factory to measure and create drawings.

Bước 5: Production and product quality control according to ISO 9001:2005 standards

Bước 6: Delivery

Bước 7: Payment of order value.

6. Warranty policy

1 year warranty for all components

ASG screw cylinder – quality creates trust

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