Melt Flow Index

Melt Flow Index

One of the properties most often quoted for both natural polymers

and masterbatches is Melt Flow Index (MFI).

What is MFI and why is it significant ?

Melt Flow Index is the output rate (flow) in grammes that occurs in

10 minutes through a standard die of 2.0955 ± 0.0051 mm diameter

and 8.000 ± 0.025mm in length when a fixed pressure is applied to

the melt via a piston and a load of total mass of 2.16 kg at a

temperature of 190°C (some polymers are measured at a higher

temperature, some use different weights and some even different

orifice sizes).

Melt Flow Index is an assessment of average molecular mass and

is an inverse measure of the melt viscosity; in other words, the higher

a MFI, the more polymer flows under test conditions. Knowing the

MFI of a polymer is vital to anticipating and controlling its

processing. Generally, higher MFI polymers are used in injection

moulding, and lower MFI polymers are used with blow moulding or

extrusion processes.

What affects the melt flow properties of polymers ?

Many factors affect polymers" flow properties. Molecular weight

distribution, the presence of co-monomers, the degree of chain

branching and crystallinity influence a polymer"s MFI as well as

heat transfer in polymer processing.

How is MFI important to masterbatches ?

In addition to its importance to natural polymers, the MFI of a

masterbatch is also important because the MFI indicates the

relative ease with which a masterbatch can be distributed during

a compounding operation or in injection moulding machines,

film extruders, etc.

 

 

نویسنده » اکا بر » ساعت 7:20 عصر روز یکشنبه 89 بهمن 3

نظرات شما ()

BASPARAN CO(LDPE)

B.I.P.C

BASPARAN COMPANY

LDPE – PLANT

INTRODUCTION

LD Plant is designed for nominal 100,000 metric tons per year high pressure polyethylene plant.

Designer & supervisor of LD Plant for early I.J.P.C (Now B.I.P.C) was TOYOSODA. This

company has got the license for erection of LD plant, from USA NDCC.

The construction contract for this plant is made between (IJPC) IRAN & TOYOSODA and the

design basis was discussed and determined at the design conference held between them. The

required production is achieved in two autoclave reactor lines, each rated at nominal 50,000 metric

tons per annual on-stream time of 8,000 hours. The basic process consists of compression, reaction,

palletizing, conveying, storage, packaging, catalyst and modifier supply.

PLANT CAPACITY& PLANT SECTIONS

IJPC initial high pressure polyethylene plant (LD Plant) employing high pressure autoclave reactor

vessels is nominally rated at 100, 000 metric tons per 8,000 hours. The plant consists of two reactor

lines, each in the same design feature, of which capacity is accordingly nominal 50,000 metric tons

per year on the basis of 8,000 hour of annual on stream time.

Plant sections are as follows:

1- Synthesis Section (# 100)

2- Production Finishing, Packaging Section (# 200)

3- Catalyst Section (# 300)

4- Modifier Section (# 400)

5- Lubricating Oil Section (# 600)

6- Waste Treatment Section (# 800)

نویسنده » اکا بر » ساعت 12:6 صبح روز شنبه 89 دی 25

نظرات شما ()