Can Making

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DELTA NEU Limited (formerly part of the NEU Engineering) is a member of the European DELTA NEU Group, and has over 30 years of experience in air technologies in Can Making in the UK, Europe, Middle East and Asia including scrap extraction, fume extraction and filtration and industrial ventilation. This includes food and beverage, two-piece and three-piece cans and ends lines.

The effectiveness of the scrap extraction system depends greatly on the capture of the waste. The cupping press hood is uniquely designed to fit each individual press and must handle lattice waste at a rate of 250 per minute. The bodymaker trimmers may eject the off-cuts or may require extraction for internal evacuation. Scrap reject cans are normally extracted from specific collection points with a facility to isolate extraction interlocked with the baler operation. Correct and effective design at these points affects not just the performance but also the size of the scrap extraction system due to the air volume selected.

Can Making

Typical cupping press hood installation

At the heart of every scrap extraction system is the Chopper Fan. The basic design has been in use for over 40 years and has changed little! In many applications, the scrap needs to be reduced in size to be conveyed from the entrainment point to the reclamation area. The chopper fan is designed with cutting blades on the heavy duty radial impeller to break the scrap up for this purpose.

In the design of the ductwork system, it is necessary to consider the dynamic laws of airflow, adequate conveying velocities, distribution and balance, abrasion and wear, energy running costs, sizes and materials available. The dynamic designs are applied in all cases however the construction and material requirements for scrap extraction applications are more rigorous than in most other ductwork systems. The design of the ductwork system will have a significant bearing on the fan selection and motor size and the Chopperline range offers a broad spectrum to choose from.

In most applications, the scrap from various areas or machines is conveyed to a central collection area or baler room where the scrap is removed from the airflow and prepared for recycling. From each source, the ducting systems will connect to an AMSP Separator. This unit comprises of a static screen manufactured in stainless steel perforated plate which causes the scrap waste to simply drop out of the air stream into the collection equipment below. The conveying air then simply passes through the screen and exhausted.

About Fume Extraction Systems

Can Making

Filtration techniques are applied to the collection and filtration of fumes which can be defined as particles of 0.5 - 1.0 microns and less. They may cover a wide range of applications from the oil mist from bodymakers or vacuum transfer conveyor fans to the paint mist from the coating and decorating units.

The design of the ductwork system for fume applications are different to those in ventilation and the ductwork design must reflect this and be constructed fully sealed. The design of the ductwork system will have a significant bearing on the fan selection and motor size and the Uniline high efficiency fan range offers a broad spectrum to choose from.

The Oilpack and Deltole range of filters are designed specifically for oil fume applications where the fume coalesces on filter panels through Brownian motion and will collect and drain from the unit for recycling.

About Ventilation Systems

Corrugated

Ventilation systems are used wherever there is a presence of heat, fumes or humidity and also where there is a need for air make-up to compensate for extraction systems themselves. Ventilation design techniques are based on two principal processes; extraction and input. Each of these is governed by good design principles, covering performance, effectiveness, energy consumption and treatment. Extracting air using Extractair roof extraction units takes away the warm air from the production area to the outside but it is important to remember that for air to be extracted, it must be possible to enable replacement air into the area. Ignoring this means the area will operate under a negative condition and draw air in through any opening, doorway or gap in the building fabric which may cause the ingress of airborne pollution and insects.

The heat load in a can plant is significant and even with a significant amount of ventilation must result in a temperature rise. The simplest way to offset this, is to provide an air input at a reduced temperature. Air conditioning is very often impracticable in manufacturing environments due to the large air volumes involved and hence high capital and operating costs. The alternative is evaporative cooling, the name given to the adiabatic process which, by evaporating a small amount of water into the air causes, under most conditions, a reduction in the temperature. Even in UK summer weather this reduction can be as much as 10oC at times, which can have a significant impact on the performance of the ventilation system. By inputting cooled air, the internal conditions can be maintained at temperatures at or below the outside ambient, even taking account of the heat gain inside. The evaporative cooling technique is employed in the Econoclim product range and operates with very low running costs, using a small amount of water from a direct supply. The inherent design has added features making it a totally safe and reliable process ideally suited to manufacturing production areas across food, packaging and print industries.

MPMA

MPMA Associate Member. www.mpma.org.uk

 

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