posted March 06, 2005 10:19 PM               

I want to design a screw for PET Flakes to recycle. i.e. of 65mm or 75mm with double venting.

If somebody can help me out.

posted March 07, 2005 08:33 AM               

Typically you will need a screw with a high compression ratio depending on the density of your reclaim. I have seen compression ratio's as high as 9:1.

Vacuum venting would be helpful. Double vents is not required unless your reclaim will be very wet. If it is very wet, it may not work anyway.

The design discharge section of the screw depends on the pressure drop of the die.

My company is able to provide design services for screws of any type. We have also worked on advanced designs for low density reclaim. However because of the nature of reclaim work the designs do not come with performance guarantees.

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Best Regards,

Tom Cunningham

Extrusion Technical Services

posted March 09, 2005 04:40 AM               

Can you send me the detail as need to built a screw, awaiting your reply.

quote:

---

Originally posted by Tom C:
Vipul,

Typically you will need a screw with a high compression ratio depending on the density of your reclaim. I have seen compression ratio's as high as 9:1.

Vacuum venting would be helpful. Double vents is not required unless your reclaim will be very wet. If it is very wet, it may not work anyway.

The design discharge section of the screw depends on the pressure drop of the die.

My company is able to provide design services for screws of any type. We have also worked on advanced designs for low density reclaim. However because of the nature of reclaim work the designs do not come with performance guarantees.

---

posted March 09, 2005 07:53 AM               

Your request is typical of those I get from India;

1) The information provided is so little I could not provide a design if I wanted to.

2) You expect me to invest time in engineering a design while you provide zero engineering effort yourself.

3) You expect a complex design for free!

I get requests like this from India all the time. Do people in India feel that other peoples time has no value?

I find in almost all other countries people are respectful of ones time and skills.

------------------
Best Regards,

Tom Cunningham

Extrusion Technical Services

posted March 17, 2005 06:59 PM               

quote:

---

Originally posted by Tom C:
Vipul,

Your request is typical of those I get from India;

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posted March 17, 2005 10:13 PM               

I was hoping to provoke some thought. Perhaps my hopes were too high.

------------------
Best Regards,

Tom Cunningham

Extrusion Technical Services

posted March 21, 2005 07:53 AM               

No matter how politely people ask, it is impossible to come up with a screw design without some information!

Not only that, but the impression I get is that a professional, who devoted many years to education (through school and work experience I suspect), is apparently expected to share his knowledge out of the goodness of his heart. If he doesn't, then he must be evil or something. I don't get it.

My company will sell you a screw- and if you buy the screw from us we will design it for free. But you don't get the design without the screw! I'm sure Tom (and others) will be happy to do this work for some sort of fee as well.

Tom you have amazing patience. I wouldn't have even bothered answering these posts.

posted March 21, 2005 10:02 PM               

I am awaiting your reply.

Please send me some sort of information that which material & what density of material we have to design in screw, where this density that place important role.

Vipul

quote:

---

Originally posted by Tom C:
Vipul,

Your request is typical of those I get from India;

1) The information provided is so little I could not provide a design if I wanted to.

2) You expect me to invest time in engineering a design while you provide zero engineering effort yourself.

3) You expect a complex design for free!

I get requests like this from India all the time. Do people in India feel that other peoples time has no value?

I find in almost all other countries people are respectful of ones time and skills.

---