Best practices for maintaining the highest quality in the rotational moulding process

Rotational moulding is a technology that is mastered through hard work and experience, two key factors in achieving maximum product quality. There are many obstacles that can hinder the rotational moulding process, which explains the importance of having an experienced team capable of resolving them before any unforeseen incident occurs.


Nowadays, several types of rotomoulded pieces are manufactured with very different needs and requirements. For example, increasingly large products are being manufactured and their own volume means that it is not always easy to control all the details of the process. 

Sometimes, an added handicap is that you may not be working to a design or mould developed by the manufacturer. Not having full control over the manufacturing process can have an impact on the quality of the product. This is why it is essential that all departments in the company work together in a coordinated way.

The essentials for higher quality

Achieving the highest possible quality piece involves adhering to a few good practices. Firstly, it is important to work from the initial design, in conjunction with the engineering department and taking into account the materials to avoid issues with problematic angles and geometries and to satisfy the technical requirements of the piece. 

It is also important to implement an eco-design philosophy. This is the best way to minimise the use of materials and help manage them correctly at the end of the piece's life. In order to be in line with the objectives of the circular economy, it is necessary to ensure that production processes have a minimum impact on the environment.

Following this good practice guide means that certain undesired effects in the production process have no place. For example, the experience and knowledge of the factory staff will correct any errors in the inserts, prevent pores and leaks, or stains caused by pigment dispersion and discolouration.

Another consequence of not meeting the most basic quality standards is the lack of homogeneity in the thickness of the piece - caused mainly by differences in heating and cooling ratios at different points in the mould - or the lack of material at certain points. This is why it is essential to control the state of the raw materials, both before the manufacturing process and in its last phase.

The team's experience is essential

The above only highlights the importance of a quality department with sufficient experience in the rotational moulding technique to know at all times what corrective actions to apply, and at the same time to detect any defect or problem in each piece if it should occur.

In rotomoulding, the quality of the product is measured through different tests. For example, the unit tightness of 100% of the tanks and pieces manufactured. Or the use of non-destructive measuring devices, capable of guaranteeing the final properties of the piece.

In the same sense, it is convenient that these quality parameters to which any good company should aspire are verified by means of the corresponding certificates. These are voluntary tests, but they constitute a guarantee of added value and are the key to establishing a relationship of confidence between supplier and customer.

Definitively, the great heterogeneity of manufacturing by rotational moulding -which is increasingly reaching more and more sectors- requires exhaustive control before, during and after the process. Something that only a team of skilled professionals in their different areas and with a good background, is capable of guaranteeing.

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