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Five Reasons For Choosing Magnetic Plate

BY: Sissi Xin | Category: Technology | Submitted: 2010-11-16 18:31:18
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Article Summary: "In terms of mould clamping unit in the large plastic injection molding machine, magnetic plate gets more and more people's attention. Compared with hydraulic plate, what are the unique advantages of magnetic plate? This article makes a detailed analysis for you..."


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Five Reasons for Choosing Magnetic Plate

In terms of mould clamping unit in the large plastic injection molding machine, magnetic plate gets more and more people's attention. Compared with hydraulic plate, what are the unique advantages of magnetic plate? This article makes a detailed analysis for you.


Safe, reliable and can protect mould.
Magnetic plate works by the permanent magnetic force of permanent magnetic material, it can maintain work without electricity. Once the plastic injection molding machine attracts mould, there are no extraneous factors (including human factor) can change or reduce the magnetic force.
But hydraulic plate supplies clamping force by the hydraulic oil pressure which created by electricity. Once occur power failure, hydraulic leakage or oil blockage, it will result in pressure decrease and be unable to reflect real-time plate status. If mould sticks or expands seriously, even if the mould is pulled into broken or hydraulic plate is stripped, the plastic injection molding machine will not stop automatically.


Wide applications, without adjustment.
Typically, different size of mould is installed in the plastic injection molding machine with different tonnage. When using magnetic plate, no matter what's the size of backboard, it can be installed on the magnetic plate without adjusting. Whether it is cross loaded, vertical loaded or even oblique loaded, there are no limitations. Because magnetic plate is all opened, there is no clamping location reserved for pressure plate, so a larger mould can be installed on the plastic injection molding machine.
Different with magnetic plate, if using fixed hydraulic plate, then all mould backboard should be the same size and should be perfectly suited for the position of hydraulic plate on theplastic injection molding machine. So a larger backboard can't be loaded on other small tonnage plastic injection molding machines. Otherwise, the mould can't be loaded or the position of hydraulic plate should be adjusted. But the adjustment is complex, it is more laborious than installing mould by hand.
The self-propelled hydraulic plate has its own weaknesses: first, the price is much higher than magnetic plate. Then, the propel range is limited (200~300 mm). Third, mould can only be cross loaded (or vertical loaded), can't vertical loaded (or cross loaded).


Extend mould life and improve product quality.
Magnetic plate's surface is full arranged magnetic poles, especially the center part, so the clamping force in the mould is uniform, mould will not occur stress deformation in the process of opening and closing mould. And the injection products have better quality and higher consistency. The mould life is extended at the same time.
In contrast, hydraulic plate only force around mould backboard, there are no clamping force at the center part (the part has the largest force when opening mould), mould overcome deformation by the rigidity of backboard completely (but in fact there are still large deformation), it result in low product quality and bad consistency, and can't reflect mould quality really, while increasing the mould wear and shortening mould life.

High reliability, without maintenance.
Magnetic plate achieve clamping by magnetic force of the permanent magnetic material, there are no moving part at interior, so there is no mechanical wear, only use power supply when loading mould. Meanwhile, there is no long-term current burning loss. So magnetic plate has a long life. After the first installation, it's unnecessary to stop to repair and maintain in the production, and there is no vulnerable part, thus greatly reduce downtime and cut down maintenance cost.
Hydraulic plate requires a large number of hydraulic elements to realize clamping, including moving part (valves), holding pressure part (accumulator), performing part (press plate), filter component (filters), searing parts (seals), power supply (power electricity and hydraulic oil), etc. These parts are the possible factors which can affect system's normal work, it's not only cost time and energy, but also lead to higher repair and maintenance costs.


No operating cost, energy saving and environmental.
Magnetic plate work without electricity, so there is no energy cost and noise. After power off, it's unnecessary to removing mould (magnetic permanently), and has no pollution to products, equipments and environment, so magnetic plate is safe and environmentally friendly energy-saving products.
Hydraulic plate must work with electricity and accumulator, and pump has large energy cost and noise, plastic injection molding machine should remove mould when shun down for a long time (pressure holding time is limited). In addition, hydraulic performing part leak oil frequently, it is energy-consuming contaminated products.


(edit by Dakumar Machinery Co.,Ltd market02@sinogroupe.com)

About Author / Additional Info:
Plastic Injection Molding Machines' manufacturer - Dakumar(http://www.dakumar.com) is one of the Chinese leading innovator for plastic molding machine's researching and developing. 

Comments on this article: (1 comments so far)

Comment Comment By Comment Date
In fact the article is very interesting. As a plastic procesor here in Argentina, where moulds can come from everywhere, specially those of the automotive industry, the magnetic fixation of the moulds on the machine seems to be the best system. We are planning to start to produce bumpers by the end of this year, so we need to buy a pair of big machines, 35000 and 45000 KN clamping force. As the moulds can weighs 50 tm or more ( i.e. VW Amarok bumper ) the question is if there are a limit for magnetic platen in terms of mould weight . In the case of a door panel, you have a mould of a great surface but not very heavy, while a bumper mould has a big weight but not a great area. Have the author of the article experience in big moulds with small surfaces like the mentioned bumper´s ones ? Héctor Insarralde 2011-02-01 13:45:34 573

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