FUKUDA

An air leak test system to confirm the sealing and waterproof performance.

Characteristic of MSZ series
  • Leak tests equivalent to IPX7 and IPX8 (waterproof standards) are possible
  • The high accuracy and efficiency the waterproof test by the air leak test
  • Line-Up corresponding to the work size
For miniature products
MSZ-0700 series

MSZ-0700

Maximum Test Parts Size
W80×D130×H55mm or below
For medium-sized products
MSZ-0700 series

MSZ-0900

Maximum Test Parts Size
W190×D150×H75mm or below
For large-sized products
MSZ-0801 series

MSZ-0800

Maximum Test Parts Size
W300×D210×H75mm or below
Target workpiece example

This device can conduct leak tests on a wide range of sealed items.

Electronic Devices

  • Smartphones
  • Mobile Phones
  • Tablets
  • Battery
  • On-vehicle Back Camera
  • Digital Camera
  • Waterproof Connector
  • Wristwatches
  • Handy Terminals
  • Compact Notebook Computers
  • Keyless Switches
  • LED Lights
  • ECUs
  • Speakers
  • Hearing Aids
  • etc.

Packaging Containers (Cosmetics, and Foodstuffs)

  • Pillow Packaging (ex. Confectionery Packaging)
  • Bottle Containers (ex. Spray container, Storage container)
  • Skin Lotion Containers (ex. Eye line, Mascara)
  • Resin/Glass Bottles
  • etc.

Process Flow

The MSZ Series is an air leak testing device able to test the water tightness of the sealed items.

Testing Example: Smartphone

The MSZ Series has been developed as a testing device for water and air tightness in electronic equipment. The following chart shows the testing process model using a smartphone as an example.Smartphones assembled in manufacturing lines are shipped out after going through a range of testing procedures designed for quality assurance purposes. Testing for water and air tightness is one of the tests that are carried out in this procedure.

First, the smartphone required for testing is setup for testing on the MSZ series and then leak testing is commenced. The item is determined as being ready for shipping if it comes within the standard leak volume parameters set prior to the test. Smartphones that show a leak rate higher than the predetermined settings are considered faulty. At this point, areas that are found to be leaking are repaired in order for them to be put back into a state that they can be passed onto shipping. We recommend that leak testing for specific areas be carried out by the HD-111 (Sniffer-Method) unit. ≫Testing process for leak areas

Once the leak area is specified, carry out the necessary repairs. Then set the repaired item into the MSZ series to retest for leaks. The item may shipped if it passes the test and is determined as being non-faulty.

*The area around the speaker must be covered with a seal during this test as this area will always be subject to leaks.

Testing model Example: Smartphone

Figure:Flow of the production process

Testing waterproof performance with air leak tests

Advantages of testing waterproof performance with air leak tests
Specification settings based on leak amount・quality control・avoid human error・drying process not needed

Generally, waterproof tests are carried out by sinking workpieces or measuring strain amount. Human errors occur easily in sinking tests as numerical control is difficult, and extra processes such as drying are necessary. Moreover, tests using strain amount have low correlation with the leak amount, therefore conversion to air or water leak amounts is not possible. As such, the setting of test specifications is based on the actual workpiece, raising issues with the rationality, adequateness and commonality of the setting values. In contrast, the air leak test is a dry method that directly measures the air leak amount, therefore conversion to water leak amount is easy and is highly advantageous towards specification settings due to the rationality and adequateness of the setting value.

Quality control using air leak amount

Waterproof standard by IP code are not quantitative. You can perform quality control more efficient by using quantified data by the air leak tester.
IP Code – Excerpt from JIS C 0920 (2003). Please refer to the JIS standard for details.
Protection grade Contents
IPX0 Non-protected
IPX1 Vertically falling drops shall have no harmful effects
IPX2 Vertically falling drops shall have no harmful effects when the enclosure is tilted at any angle up to 15°on either side of the vertical.
IPX3 Water sprayed at an angle up to 60°on either side of the vertical shall have no harmful effects
IPX4 Water splashed against the enclosure from any direction shall have no harmful effects.
IPX5 Water projected in jets against the enclosure from any direction shall have no harmful effects.
IPX6 Water projected in powerful jets against the enclosure from any direction shall have no harmful effects.
IPX7 Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is temporarily immersed in water under standardized conditions of pressure and time.
IPX8 Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is continuously immersed in water under conditions which shall be agreed between manufacturer and user but which are more severe than for numeral 7.

Air leak test equivalent to IPX7 and IPX8

Quantitative waterproof test
IPX7・8 are defined to be “Ingress of water in quantities causing harmful effects shall not be possible” In order to perform a quantitative test, must be determined as a numerical value, the “water leak amount causing harmful no effects.” Then Water leak amount can be converted into air leak amount. By determining the numerical value, waterproof test with the air leak test is possible.

Measurement methods

Products with a waterproof feature are sealed therefore have no opening through which pressure can be applied. If this is the case, the workpiece is put inside a capsule, to which pressure is then applied. Leaks are detected because the internal pressure of the capsule drops if there are leaks.Leak tests for sealed products must include both large leak measurement and small leak measurement. If there is a large leak, the inside of the workpiece will pressurize at the same time that pressure is being applied, therefore correct measurement will not be possible. There are 2 types of leak tests for sealed products; tank partial pressure type and tank pressurization type. The appropriate type should be chosen to suit workpiece characteristics.
With no masterMaster-Less Tank Pressurization Depressurization Type

In the first instance, pressurized air stored within the tank is pumped into (or out of) the test piece capsule, and then any leaks are detected. A comparison with the inner tank pressure is made, and as there is no reduction in test pressure when large leaks are tested, it is also possible to carry out more refined large leak tests. This device is designed for small test pieces with small inner capacities.

With master 
Tank partial pressure type
 

The workpiece is sealed with the capsule, and the minute pressure drops caused by the capsule internal pressure leaking into the workpiece are measured.







Leak area testing process HD-111 (Sniffer-Method)

Testing model Example: Smartphone

Figure :Example of detection model for leaking areas using the sniffer-method

See here for product details

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