Posts: 4
From:ahmedabad, gujarat, INDIA
Registered: May 2005

posted May 30, 2005 10:03 AM               

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dear sir,

let me know the pp copolymer can be bond with PE material in 3 layer line or it requires any tie layer.

weather 100 % PP can be run in middle of 3 layer plant or not.

awaiting for your reply

thank you

mitul chavda

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Posts: 385
From:McHenry, IL USA
Registered: Nov 2002

posted June 08, 2005 07:22 AM               

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I'd suggest using a tie layer for either or both. Why don't you try it without and report your results?

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Posts: 4
From:ahmedabad, gujarat, INDIA
Registered: May 2005

posted June 08, 2005 07:26 AM               

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Thank you for repling me.

so without tie layer it is not possible to bond polypropylene and polyethylene.

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Posts: 2
From:UK
Registered: Jun 2005

posted June 08, 2005 11:57 PM               

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It is possible to use PP with PE on 3 layer Co-Ex line without using a tie layer. The PP can be used at 100% in the core layer. The inner and outer layers should preferably be a C6 mLLDPE grade. Borealis supply a PP specifically designed for blown film and I have run this sucessfully.

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Posts: 4
From:ahmedabad, gujarat, INDIA
Registered: May 2005

posted June 09, 2005 02:33 AM               

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Sir, I am running Polypropylene copolymer of Balen in middle layer but sometimes one layer of that film is delaminating from PPCP layer,

so Polypropylene copolymer require tie layer to bond with LL or LD

thank U

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Posts: 4
From:ahmedabad, gujarat, INDIA
Registered: May 2005

posted June 10, 2005 08:50 AM               

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hello sir,

can u please suggest the grade of borealish and mlldpe which you have run.

thank you

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Posts: 2
From:UK
Registered: Jun 2005

posted June 15, 2005 03:32 PM               

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Borealis RB707CF Polypropylene
Borealis Borcene FM5226 mLLDPE

They will be able to give technical assistance and suggestions for blends depending on what you are trying to achieve.

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Posts: 28
From:bethesda MD USA
Registered: Sep 2001

posted June 27, 2005 11:16 PM            

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Regarding need for tie layers between polyolefins, it isn't as simple as "two materials do or don't bond." You can get varying levels of bonding from using different resins, as already noted, or sometimes from additives in the resins which you put in or which come with them, which can increase adhesion. Some additives can make bonding worse rather than better. Also, a change in melt temperature of one or both surfaces makes a difference, but if you are running blown film, running hotter may mean running slower.
Finally, you need added equipment for tie layers. If you have it, use it. If you don't, consider the other options.
One more thing: c6 mLLDPE is expensive. See if a similar resin is available locally. Ask Borealis which resin contributes to the bonding; maybe you don't need the c6 and can use c4. The c6 stands for the number of carbons in the comonomer (all LLDPEs are basically copolymers of ethylene with another olefin, c4 is cheapest, c8 is Dow's Dowlex, and several suppliers offer c6. The carbon numbers relate to strength and sometimes clarity, but the c6 and the m (for metallocene catalyst used in manufacture) may not be needed if it's just bonding you're after.
Allan Griff

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Posts: 1
From:singapore
Registered: Jul 2005

posted July 19, 2005 06:48 AM               

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hi, I want to know about extruder and various type of barrier screw for my studying purpose

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