Technical benefits and properties of blow moulding

What is plastic blow moulding?

Blow moulding is based on extrusion. In a blow moulding, a tube of warm plastic is lowered between the halves of a mould. The mould is closed, and air is led into the tube at a suitable pressure, moulding the plastic tube into the contours of the mould. The piece is then cooled down, the tube is cut, the mould is opened, and the piece is ready for finishing.

The process is quick, which makes a blow-moulded piece very competitive in terms of pricing. What makes blow moulding an excellent mass production method is its good repeatability and because it is very controllable to produce identical results between repetitions.

The benefits and properties of blow moulding

Blow moulded pieces are seamless, vessel-shaped or sinusoid, most often round. Blow moulded pieces can be very long or channel shaped. There are no real restrictions to shape. Different kinds of evasions or include several inserts, such as metal threading, hose clamps, support struts or fastener ears.

“Especially in machining and appliance industries, our clients struggle with cramped spaces in ever-shrinking machining spaces. With blow moulded pieces, we can utilize the tight spots, because the pieces can take many shapes and the thickness of the pieces is controllable.”

The blow moulding method enables equal and thin thickness in the pieces. In blow moulding, the thickness of the pieces can be determined in a very detailed manner, because the method ensures good viscosity. Thus, it is possible to optimize the weight of a piece, because the thickness does not need to be increased to reach required stiffness.

The thickness of the piece’s wall affects material expenditure and thus the price per unit of the pieces. Material choices also enable transparency, enabling for example seeing how full of liquid a piece is without opening it.

Production of dimensionally accurate plastic products is possible, because the range in blow moulding is easy to control.

” The range of two fastener ears at the opposite ends of a piece that is over a meter long can be kept under a millimetre.” 

Strong flat and thin pieces can also be blow moulded. The capsular structure ensures a stiff enough piece but is lighter than a solid structure.

The plastic used in blow moulding is chemical resistant and is thus safe in even challenging targets.

Blow moulding mould

The moulds for blow moulded pieces are very resilient and last almost forever. A yearly yield of 100 000 moulded pieces can be easily done with a single mould. Resilience and a long life are visible in the price of the moulds but is compensated quickly, if the volume of the moulded piece is expected to grow.

” Our oldest moulds are from 2003, and they are still in complete working order. We do basic maintenance and slight adjusts to our moulds from time to time. “

Blow moulding is an eco-positive method

Press release for the Subcontracting Trade Fair 2019

Blow moulding allows for the production of a technical product as a single piece, which results in savings in energy consumption and simplifies the customer’s assembly phase.

The use of plastics has positive impacts on the environment via energy and material savings

Life cycle analyses have demonstrated that in the right product groups plastics produce the smallest total impact on the environment when compared to other materials.

As a responsible partner we are ceaselessly developing our operations. We always strive to utilise materials effectively and save energy, which also cuts costs and thus also reflects positively on productivity.

We recycle material in our own production to avoid raw material waste and instead funnel the valuable material for reuse.

We strive to minimise our environmental impact with high-quality product design that optimises the need of materials and maximises the product’s service life and recyclability. We design the most functional and material-efficient solution for each purpose.

The positive environmental impacts are realised as savings in energy and materials as well as reductions in waste volume and energy needs in distribution and transportation. We use reusable packaging materials with many of our customers.

We are a partner with ISO9001 and ISO14001 certifications.

You are welcome to join us to discuss sustainable and eco-positive plastic solutions and forging a long-lasting partnership!
The Subcontracting Trade Fair 2019 is held in the Tampere Exhibition and Sports Centre on 24.–26.9.2019.


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