The Straightening machine is an equipment for straightening metal sheets, bars, and wire coils. It works on the principle of generating in the sheet stresses approaching the yield point by application of a bending force. It is equipped with rollers that are supported by a frame and a drive. The bending is done by applying a variable pressure against the rollers. The maximum straightening capacity of the machine is defined by the material thickness and width ranges. The power requirement of the straightening machine is determined by the maximum material width and thicknesses, the bending radius of the work rolls, the maximum bend angle, the pinch roll pressures and the straightening roller depth settings.
The ability of the straightening machine to process wide materials is limited by the fact that the deflection of the work rollers in relation to their support journals increases with increasing material width. This excessive deflection results in a loss of contact surface area between the work rollers and the product, decreases straightening efficiency, causes slippage of the product through the straighteners and, in extreme cases, can break the work rollers. To reduce the effect of this phenomenon, the machine can be fitted with back-up rollers. These are positioned parallel to the work rollers, at a distance equal to or slightly less than the material width and work roller diameters.
Straighteners with a higher number of work rollers are more flexible than those with fewer. However, the roller diameters and centre distance spacing also play a role in determining the power required to operate them.
If the work rollers are deeper than is necessary to achieve an acceptable level of flatness, the straightening efficiency suffers and the machine requires more power. Excessive roller penetration also results in excessive stress and strain on the work rollers and end journals.
To ensure that a given model of straightener can deliver effective results at all times, the optimum combination of pinch roll pressures, drag brake strength and work roller depth settings is required. These are typically established by air pressure regulators or screw down and gauge combinations.
For the healthiest straightening experience look for a model with ceramic or tourmaline plates as they are the most effective at locking in moisture. This helps to reduce heat damage and leave hair softer and smoother. Ensure the hair is completely dry before styling and use a heat-protection product to further reduce the risk of damage. Finally, always straighten hair in small sections (about an inch across) to avoid over-straightening. Also, use a comb to separate the hair into smaller parts before starting. This will give the straightener more control and make it easier to achieve a style that you are happy with. If possible, choose a portable straightener with a long battery life as this will enable you to straighten your hair in the shortest amount of time. This is especially important if you have thick hair. You can also opt for a cordless, lightweight, compact straightener that can be taken with you on your travels.