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Screw Tip Assemblies


Email: Sales@completeplastics.com | Phone: 770-427-3834 | Fax: 770-427-3932

All Products Made In The USA
We are proud of supporting our customers with full certification of all material we build their parts from.
We want our customer to know what they are paying for is what they get. If you have a supplier that says that don’t track materials per part or they don’t do that, it’s time to get a new supplier!!!
If you have a Nissei Molding machine and the OEM recommends CPM9V for your application. There are many materials that can be used and as a customer without Certification you have no idea it is not CPM9V unit it doesn’t last as long as you expect.

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Screw Tip Quality Control

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Injection Molding Screw tips

 


Screw Tips of any size and machine make. We supply Screw tips in all designs, with all material spec’s to give you the longest life.

Robo Shot Screw tips use a standard design. With the speed most customers try to run with the machine pre-mature ware is a big issue. We look at the issue and sometime nitriding for the faster speed will help with the ware of the tip under high back pressure and screw speed.

Demag Screw Tips have a history of warring the ring over the retaining head from the type of back pressure the machine can generate. With a C2 Combo Screw tips design and the Carbide welded at the back of the retainer can stop the ware and give a much longer life.


 

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Screw Tips for any material in your Injection Molding applications. If you have been in the plastic molding business you have seen all kinds of manufacturers of Screw Tips that claim their units are the best design in the industry. In the 70’s and 80’s co-polymers and new additives were introduced to solve issues with flame retardants, material strength, and color. Due to the changes the old screw tip designs needed to be changed. One of which was a general purpose screw tip that was 3 pieces and non free flowing.. With the new material coming on the market the standard Screw tip would burn the material or would not flow at all. This is the point where the market was flooded with new designs.

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Screw Tip Assembly

A Four Piece design

This design came out to help with the wear issues of the glass filled material. The point of these were that you sacrifice the front and rear seats due to wearing to save the more expensive parts like the retaining head and ring. The issues that came were that they were not free flowing and they had issues with burning, but again for certain applications this is a good design.

The Castel or Locking Design.

The Locking design was developed for applications that that required quick and consistent shut off to the mold. For consistency this was a very good design and worked well on smaller parts and are used on Japanese applications almost exclusively. The down side of the design is that the clearance between the barrel wall and the screw tip ring had to be enlarged to not burn or gull the barrel. With the tip turning with the screw if you left the same clearance as the non-locking style with the ring turning with the screw it generated significant sheer heat and would burn or in larger machines could lock up and damage the screw tip and or barrel. The clearance depending on the size of the machine would have to be opened up from the standard .0015″ per side to upwards of .006″ per side. The issue then becomes that some jobs in the plant can run well with .012″ clearance between the barrel wall and the ring on a new tip.

Three Piece Free flow.

This Design was an upgrade from the standard three piece tip design. The changes were that the ring was opened up for more clearance as well as the flutes in the retaining head were deeper and followed all the way forward closer to the tip of the retainer. This was the best of all worlds. This design created great flow for Glass filled material with no burning and would reduce heat in the first two zones of the machine for better control.

Screw Tip Materials.

Of course as designs change so did the material tips were made out of. Most were made from D2 at that point. Now there is CPM 9V and Carbide for high ware applications, H13 and D2 for general purpose materials as well as PVC and low temperature materials. H13 material is such a versatile material it is used for 70% of the application in the market.

Between the new designs for Screw Tips and the material upgrades if you let us know what your applications are we can set you up with the design that will fit your application and give you a standard tip design to help you stop the issue you have in production. Then since all your machines have the same design tips you can profile your jobs easier and cost of replacement is lower.

The major issues we have in the Screw tips market today is cost vs. price. The one thing to keep in mind is anyone can build you a cheap tip, China, India and so on. The screw and tips are the life blood of your machine and your production. Buy a good tip to last and make production more consistent. It will pay you back far more than the few dollars you will save on a cheap Screw Tip.

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A. Type of Machine

B. Model of machine

C. Diameter of tip

D. Tip Overall Length

E. Made of what material

F. What materials do you run

G. Three piece or Four

H. Locking or Free flow

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Screw Tips of any size and machine make. We supply Screw tips in all designs, with all material spec’s to give you the longest life.