Both regenerative and centrifugal blowers are widely used in industrial processes. Superficially the two types of blowers can seem similar and it can be difficult to find good information on the differences between the two types of blowers and why one would be selected over the other.
First, we’ll discuss what the two types of blowers have in common. Both types move air using an impeller on a rotating shaft. The air comes in the inlet and is focused while traveling with the impeller before exhausted as linear flow at the outlet. This is where the similarities end.
One of the most common mistakes we see our customers making when selecting a process heater is basing their choice on temperature rating rather than power rating. Temperature can be important but is generally a dependant variable. In this article we will discuss why the power rating is such an important parameter and some of the fundamentals needed to calculate your process requirements.
In an air heater, air is blown over a resistance coil which is heated by a voltage applied across it. The temperature control of the air at the outlet of an air heater depends on the level of sophistication of the heater and any control systems with which it is integrated. Before discussing air heater control, first we will take a very high level look at system control.
Injection moulding is one of the most common industrial methods for high volume production of plastic parts. Plastic is heated until it reaches a thermoplastic state and is then injected into a mould. During this process a seam can develop on the part where different segments of the mould meet, known as the parting line. This seam of excess plastic is called flash. Flash must be removed from the part when it occurs in an area where surface finish is important or where it will cause an interference.
The hallmarks of a bad shrinking job are easy to spot: wrinkling, rising, dimpling, tearing and uneven shrinking. These problems drive packagers nuts and can put off potential customers. Read on to discover possible causes and solutions to the most common problems facing packagers working with shrink labels.
Variable Frequency Drives (often known by their initials: VFDs) convert a fixed-frequency supply voltage (60 Hz in North America) to a continuously variable frequency. By controlling the frequency of the voltage supplied to an AC motor, we can control its rotational speed and minimize stress. A VFD can control two main elements of a 3-phase induction motor: its speed and torque.
Choosing the correct blower is a fundamental step in designing a functional and efficient system. We’ve covered the basics of Regenerative versus Centrifugal Blowers and Understanding Blowers as part of System, in this article we’ll show how to read a blower curve and use that information to specify the best blower for your project.
Most blower suppliers use similar types of specifications to describe the blower function. Below is an example of a typical blower spec sheet.
Air knives are used in many industries to remove unwanted materials from processes. This can range from blowing water off of bottles in a bottling facility to removing cooling fluid in a metal rolling plant to removing crumbs from a bakery conveyor system. While the use of air knives for blow-off is widespread, so are the errors in setup that cause ineffective or inefficient operation. In this article we will review some of the fundamentals of implementing an effective blow-off system.
Flow, Velocity, and Pressure Defined
One issue that seems to cause universal confusion when designing a blower-based system is understanding the differences between flow, velocity, and pressure and knowing when each metric is important. This article investigates this topic with a focus on how they relate to each other in applications with industrial blowers.
First, let’s define each term:
Achieving a perfect shrink on a sleeve label is often easier said than done. Even with a custom built system some experimentation may be necessary as you dial in the settings needed to achieve that all-important perfect shrink on your bottle, can or other packaging. Two of the primary variables to adjust are Temperature and Time; it is important to ensure they are in balance in order to achieve an acceptable final product ready for display and sale.
One of the advantages of air heated shrink tunnels is their wide temperature range. This offers another variable that can be altered to compensate for increasing line speeds, beyond simply extending the length of the shrink tunnel. The operating temperature of the shrink tunnel may need to be increased if labels are exiting wrinkled or with uneven shrinking. Or the temperature may need to be decreased if labels are tearing or over-shrinking.