Extrusion: Learn About Grooved Feeding

Plastic industry Expert

In specific circumstances, Grooved Feed can increase output and reduce melt temperature. But these throats are not for every application.

There are basically two types of single-screw extruders, distinguishable primarily by their feed-throat design.

Most single-screw extruders have smooth-bore feed throats—basically a smooth pipe surrounding the rotating screw.

Extruders with smooth-bore feed throats are affected a number of ways by the resistance or “head” pressure against which the screw is rotating. As the head pressure increases, a reverse flow (or pressure flow) develops in the screw channels that subtracts from the output (or drag flow) while increasing the melt temperature (because the material is essentially being re-circulated back into the screw).

This can cause significant problems in extrusion processes that have inherently high head-pressure characteristics resulting from a narrow die gap, such as in blown film, extrusion coating, and thin-wall tubing.

With a smooth-bore feed throat, solids transport of material…

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Highest Performance & Efficiency from your extrusion line

Plastic industry Expert

Article courtesy – http://www.ptonline.com
Originally written by – CHRIS RAUWENDAAL
President, Rauwendaal Extrusion Engineering Inc.

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To get high efficiency in extrusion there are lot of things we have to do.

When Quality people run line and manage operation they give high quality & stable process.

 Successful extrusion is not about doing two or three things right—it’s about doing hundreds of things right.

Proper instrumentation is necessary to achieve efficiency in extrusion. In Extrusion the most critical process variables are

Melt pressure, Melt temperature, and Motor load.

These are very important symbol of the extrusion process. With these following more parameters above three must be continuously measured and monitored.

• Barrel and die temperatures,
• Screw speed,
• Power consumption in each heating or cooling zone,
• Ambient temperature,
• Relative humidity,
• Temperature of feedstock entering extruder,
• Moisture level of feedstock entering extruder (if hygroscopic),
• Flow rate of cooling water through…

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Important tips to increase injection moulding production.

Plastic industry Expert

The productivity of the machine can be measured as the amount of output the machine can produce per available time, with desirable performance and best quality

Windsor machine

Energy Saving

Efficient barrelinsulation can save around 20% in energy consumption.  Active drive, with variable speed pumps, could give savings of up to 45% on longer cycle times but has less impact on fast cycling operations.  Moving from hydraulic dosing to electric drive dosing can give energy savings equivalent to a pay-back time of less than 2 years. Integrated energy control allows optimization of energy consumption by quickly comparing different machine set-ups.

Durability and Maintenance

In hydraulic machines applying a new filter and oil cooling concept, results in increased oil lifetime 40,000 hours and lower maintenance costs.  Linear platen guidance systems also lead to reduced maintenance and higher precision (from platen parallelism).

Due to the competitive nature of the plastics industry, companies are…

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Know the quality of steel used in your machine.

Plastic industry Expert

A screw-Barrel set plays a vital role in plastic processing as raw plastic melt inside the barrel and rotate through the screw.

Plastic business is one among the most competitive businesses in the world that demands a non-stop and constant production at desired output rate. Stopping the production due to screw or barrel abrasion is always undesired by processors, but what when this happen frequently to your machine?

Nobody will like the situation when they have to buy a screw twice in a year.  Compromising screw-barrel material quality causes loss in your business, because it’s not screw-barrel but the time which is directly proportional to your financial growth. So buying a good quality screw-barrel is the only option to save your money (time) and money.

Now many buyers in India have very less idea about the material used in screw and barrel manufacturing. One may be surprise but it is…

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Know Your Screw-Barrel Properly! What is EN41b? What is Bimetallic? What is Tungsten-Carbide Coating?

Plastic industry Expert

A screw-Barrel set plays a vital role in plastic processing as raw plastic melt inside the barrel and rotate through the screw.

Plastic business is one amongst the most competitive businesses in the world that demands a non-stop and constant production at desired output rate. Stopping the production due to screw or barrel abrasion is always undesired by processors, but what when this happen frequently to your machine?

Nobody will like the situation when they have to buy a screw twice in a year.  Compromising screw-barrel material quality causes loss in your business, because it’s not screw-barrel but the time which is directly proportional to your financial growth. So buying a good quality screw-barrel is the only option to save your money (time) and money.

Now many buyers in India have very less idea about the material used in screw and barrel manufacturing. One may be surprise but it is…

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