Have you ever heard of ‘low pressure molding’ in the injection molding process?
You may be thinking, ‘When I think of molding, I think of high pressure!’ In fact, recent technological advances have brought low-pressure molding into the spotlight. The advantages of low-pressure molding are nothing short of amazing. This is exactly where ‘pressure-resistant molding’ comes in. In this article, we will introduce some of the advantages of ‘low pressure molding’.
Advantage 1 of low-pressure molding: prevents gas burns! ‘Skin-friendly molding’
The problem of ‘gas burning’ is a nuisance when performing injection molding. Gases cannot escape from the inside of the mold and the material ignites at high temperatures... This is a problem that must be avoided. This is where low-pressure molding plays a major role! In low-pressure molding, less pressure is applied to the material, so gas generation is suppressed and, as a result, gas burns are less likely to occur. In other words, it is a mold-friendly process that does not suffer from ‘stains and wrinkles’ caused by gas burns.
In addition, low-pressure molding also increases the effectiveness of gas venting. The low pressure allows the material to ‘take a smooth walk’ with the gases, so that they can easily escape. This also reduces gas burns and silvers (luster defects), which will undoubtedly improve the quality of the molded product.
Advantage 2 of low-pressure molding: energy-saving and earth-friendly! ‘Let's go in energy-saving mode!’
Compared to high-pressure molding, low-pressure molding uses less energy. The name ‘low pressure’ is somewhat self-explanatory. A large amount of electricity is needed for the molding machine to press at high pressure, but low pressure saves a lot of energy. In this day and age of environmental issues and SDGs, energy saving is important even in the manufacturing process.
Moreover, by incorporating low-pressure molding, it is possible to obtain molded products of the same quality while adjusting the injection speed and pressure holding time. This is both eco-friendly and results in cost savings. It is truly ‘value-for-money molding’ that is friendly to both your wallet and the planet.
Advantage 3 of low-pressure molding: longer mold life! ‘No pressure, all the way along’
Lower pressure on the mold naturally means less strain on the mold. High-pressure molding inevitably places excessive stress on the molds, making them more susceptible to damage after prolonged use. This can result in more frequent maintenance and, in the worst case, a shorter mold life.
Low-pressure molding, on the other hand, is a ‘no-pressure’ process, which means that it is gentle on the molds and lasts longer. It can significantly reduce the frequency of maintenance of the molds, which in turn can significantly reduce operating costs. So it's important not to overwork the molds either.’ Long-lasting molds will ultimately bring significant benefits to the company.
Advantage 4 of low-pressure molding: complex shapes made easy! ‘Artistic molding, we've started.’
Another major advantage of low-pressure molding is its suitability for molding complex shapes. With conventional high-pressure molding, there is a risk of deformation or short shots (underfilling) if too much pressure is applied to complex molds or part shapes. With low-pressure molding, however, the pressure is distributed appropriately and the material is evenly distributed throughout the mold, so even the smallest details can be molded.
For example, low-pressure molding technology is very effective for products such as automotive parts and household appliances, where design and functionality are required. No more lamenting, ‘No more short-circuit molding!’ No more short-circuit molding! Low-pressure molding is a great way to ensure that even complex shapes can be filled.
Advantage 5: Reduced burrs! ‘Clean molding and easy post-processing’
Burrs’ - a troublesome problem that haunts moulded products.
These are the ‘burrs’ in taiyaki. Mimi on the surface makes you feel like you're getting a good deal, but in the world of moulding, it is a big problem!
In high-pressure moulding, material tends to overflow and burrs tend to form in the gaps between the moulds. This is very troublesome to clean up afterwards. However, in low-pressure moulding, material flow is easily controlled and burrs are less likely to occur. This means that post-processing time and costs can be significantly reduced.
Low-pressure moulding uses the gaps in the mould to allow the material to flow properly, so there is less waste and a cleaner finish can be expected. ‘Isn't this a bit of a revolution?’ Don't you think? It is truly ‘easy moulding’ without the need for post-processing.
Summary: Open up the future of moulding with low-pressure moulding!
What do you think? Low-pressure moulding has many advantages, such as preventing gas burns, saving energy, extending mould life, handling complex shapes and reducing burrs. This technology enables more efficient and higher quality moulding. Just by slightly changing the way you think about ‘pressure’ in injection moulding, the future of moulding could be brighter.
So, I hope you will all adopt the new approach of ‘low pressure moulding’ and make your next moulding project a success ☺.
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