What is the leak test and why is it so important during the rotational moulding process?


Achieving the highest possible level of quality in its products has to be one of the main aspirations of any company that wants to compete in today's demanding market. This level of excellence can be reached in different ways, but there are no shortcuts. 

_V3A6658-color (1)For example, by setting up a team of well-trained and experienced professionals, capable of knowing at all times what corrective actions to apply in the event of a possible defect in the piece. Moreover, establishing absolute and exhaustive control over all phases of the manufacturing process is essential.

In this commitment to quality, another fundamental aspect is the correct performance of all the necessary tests before the product is marketed so that everything goes according to plan.

Testing for quality assurance in rotational moulding

In the rotomoulding industry, the final quality of the product is measured by various parameters, which are fundamental for the pieces to reach the required quality levels. For example, the use of non-destructive measuring devices, with which the maintenance of the final properties of the piece is guaranteed.

One of these tests is the one that measures the unitary tightness of 100% of the products. This is a basic concept in rotational moulding, and consists of the ability to prevent leakage - whether of water, fuels or coolants - from the inside of the piece. 

It is the only way to ensure that the piece is completely sealed and does not leak anywhere. This is an absolutely important aspect when it comes, for example, to objects such as floats and tanks. More than important, it is absolutely essential in many cases, depending on the technical requirements of each piece.

Consider, for example, a fuel or coolant tank in a wind turbine tower. Leaks in these elements can, under certain circumstances, lead to a serious accident with many undesirable consequences. And not only economically, which are already regrettable in themselves: they can even endanger human lives.

What is a leak test?

The purpose of leak testing is to ensure that there are no pores in any system involving fluids at pressures equal to or different from atmospheric pressure. 

There are several test methods, and one of the most common is the direct bubble test. To carry this out correctly, a number of steps must be followed.

First of all, air at a specific pressure is introduced into the piece. Then it is immersed in water. In this way, if a thread has any defects or pores, bubbles will be seen coming out of the piece. This is the unmistakable sign that the product is not watertight and there is a leak.

Who performs the test

As is the case throughout the entire rotomoulding production process, the training and experience of the employee are essential to achieve the desired objectives.

In the case of leak testing, it must be carried out by an operator who has been properly trained. This person will be in charge of selecting the best position in which the piece should be placed. This is the most direct and effective way to prevent any piece from leaking undetected.

And, above all, it is vital to understand the importance of this test in a context of absolute rigour in the quality controls that only the most solvent and experienced companies can guarantee.

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