The OptiMISER System - Polyethylene Blend Formulating & Optimizing
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Blending Basics

Why blend?
Same performance at lower cost
How resins behave
Polyethylene grades and properties
The need for pre-blend testing
Formulating a successful blend with The OptiMISER System

Why blend?
The blending process allows you to combine properties of the blend components and generate polyethylene blends for optimized performance. Blending offers the opportunity to utilize lower cost resins while maintaining or improving product performance. Blending can lower costs, improve throughput and tailor material specifications to your products. Blending can also produce a unique set of properties that are not available in a single resin.

Same performance at lower cost
When properly formulated, resin blends will perform with the same characteristics and reliability as virgin materials — sometimes even better. But in almost all cases, the raw materials will cost much less.

The key to routine output of high-quality product starts with a clear understanding of the product requirements and the material performance properties for each potential resin. The more you know about a materials' performance characteristics and behavior, the wider your options in terms of the range of materials you can consider as viable candidates for blending.

That opens the door to using lower-cost materials to produce formulas with high performance values — even value-added performance — while reducing your polyethylene blending costs.

How resins behave
In general, all resins are composed of a distribution of polymer chains with a different number of repeat strands or units. Because of this distribution of chain lengths, and thus molecular weights, describing the resin using just MI and density is inadequate for many applications.

But molecular weight and its distribution are critical considerations. Here's why:
  • In the melted state (called "extrudate"), molecular structure determines the processing characteristics.
  • In the solid state, molecular structure determines the all-important performance properties of the final product.
  • A wide distribution of molecular weights (a wide range of variations in chain lengths) makes extrudate easier to process.
  • A narrow distribution of molecular weights (less variation in chain length, more typical with virgin resins) makes extrudate more difficult to process.
Polyethylene grades and properties
PE grades
Polyethylene is available in a wide range of grades. The OptiMISER System works with all grades of polyethylene.
  • HDPE
  • MDPE
  • Wide-specification PE
  • Regrinds (post-industrial and post-consumer)
  • Reprocessed (post-industrial and post-consumer)
  • Recycled
PE properties
In the 50+ years since plastics became viable materials for many products, experts have determined that there many material properties that affect resin behavior in very important ways. A few of the frequently used properties are below:
  • Density
  • Elongation
  • Environmental stress crack resistance (ESCR)
  • Flexural modulus of elasticity
  • Flexural strength
  • Impact strength (determined via the Izod impact test or the Dart impact test)
  • Melt index (MI)
  • Modulus of elasticity
  • Molecular weight
  • Molecular weight distribution
  • Processability
  • Rheological properties
  • Sag resistance
  • Shear rate
  • Slow crack growth
  • Tensile modulus of elasticity
  • Tensile strength
Plastics behavior is determined by a wider range of specifications than simply melt index and density. Blending for MI and density alone does not ensure good processability or product performance. This is one reason why two different lots of the same polymer may have the same melt index and density but exhibit different behavior during processing.

The need for pre-blend testing
The growing availability and lower cost of recycled polyethylene resins makes them very attractive alternatives to virgin material.

To develop a successful formulation, you have to know the key properties of each of the materials for the applications you're working with. Not only does The OptiMISER System use material characterization, it offers you low-cost, rapid material characterization techniques. Once the materials are tested, the data is used in The OptiMISER System’s advanced formulization software.

Formulating a successful blend with The OptiMISER System
The technology starts with an understanding of the molecular makeup of polyethylene resins (prime, wide-spec and recycled) and accurate material characterization. With this information, two or more components are brought together in an ideal combination to reshape and optimize the molecular makeup.

With The OptiMISER System, all the complex issues are handled upfront, keeping the manufacturing process simple for you.

The molecularly enhanced resin combinations of wide-spec, recycled and even prime polyethylene resins are generating substantial material cost savings.

To download The OptiMISER System brochure in PDF form, click here.
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