This test is applicable to Transport Packaging Testing It assesses the resistance of transport packages and unit loads to rain-induced unloading, as well as the packaging's ability to protect the contents. It can be used either as a standalone test or as part of a broader evaluation process. Transport Packaging Testing A component of the series of experiments.

At Transport Packaging Testing During this test, the sample is typically placed on the test surface and sprayed with water at a specified temperature for a predetermined duration and at a controlled flow rate (water output). The standard methods involved in this test include: GB/T 4857.9-2008 ， GJB 2711-1996 Method 16 Method f Spray method, GJB150.8A-2009 Program I Rainfall and wind-driven rain. Below, we’ll explain in detail how to conduct the rain-simulation test for transport packaging under three different standard methods.

1. GB/T 4857.9-2008

1.1  Sprinkler system

The sprinkler system should meet 100L/ ( m ² ·h ) ±20L/ ( m ² ·h ) The rate of water flow. The sprayed water should be evenly distributed, and the nozzle height must be adjustable to ensure a minimum distance is maintained between the spray nozzle and the top of the test sample. 2m The distance. There are two spray methods: method A And methods B ：

Method A (Continuous Spray System): The nozzles are neatly arranged and fixed above the test sample, with adjustable height.

Method B (Intermittent Spraying): A row or several rows of nozzles are arranged along the width of the test sample, and the nozzles are moved along a direction greater than the length of the test sample.

1.2   Water supply system

Spray rate and pressure are adjustable, and the water temperature is at 5 °C Approximately 30 °C Between them.

1.3    Experimental Procedure

A ) Adjust the nozzle height so that the distance between the nozzle and the closest point on the top of the test sample is… At least for 2m . Turn on the nozzles until the entire system reaches an equilibrium state. Unless otherwise specified, the temperature of the spray water and the test environment temperature should both be within 5 °C And 30 °C Between them.

b ) Place the test sample in the test area, positioning it at the predetermined location and under the specified temperature conditions, ensuring that water is delivered onto the sample according to the calibrated standards. Then, maintain a continuous spray for the pre-determined duration.

c ) Inspect the test sample and its contents for any signs of reduced waterproof performance or water leakage.

2 .GJB 2711-1996 Method 16 Method f Spray Method

2.1 Test Procedure

A ) Place the test sample on a level surface directly beneath the spray device, ensuring that water droplets are evenly sprayed vertically onto the top of the sample as well as the surrounding floor area. Unless otherwise specified, the spray rate is ( 100 ± 25 ) L/m² ·h 。 Spray duration is 4h When several test samples are subjected to spray testing simultaneously, the spacing between them should be… Not less than 150mm。

b ) After the spray test is completed, carefully wipe dry the exterior of the test sample at the area to be opened before proceeding. Then, open the sample to inspect for any leaks, paying close attention especially to areas like seams and welds.

c ) Record whether the test sample leaks and identify the leakage locations, as well as any adverse effects caused by the spray on the test sample.

3 .GJB150.8A-2009 Program I Rainfall and wind-driven rain

3.1 Applications

This test is suitable for evaluating storage and transportation. / Equipment that may be exposed to rain, water spray, or dripping during operation:

A If the equipment is installed in the same condition, a more rigorous immersion (leakage) test is typically considered to determine whether water can penetrate the device. If the equipment has already passed an immersion test without any changes in its installation status, it usually does not need to undergo a rain-simulation test. However, there may still be issues during the immersion test—specifically, problems caused by pressure differences—that don’t become apparent when performing the rain-simulation test.

b ) If the equipment might be placed on a surface with significant water accumulation, an immersion test may be more appropriate. In most cases, if both tests are deemed suitable within the product’s lifecycle profile, then both should be conducted.

3.2   Purpose of the trial

The purpose of this test is to determine the following environmental effects related to rain exposure, water spray, and dripping:

A ) The effectiveness of protecting equipment housings, casings, and sealing gaskets against water infiltration;

b ) The ability of the equipment to meet its performance requirements both when exposed to water and after such exposure;

c ) Any physical damage to equipment caused by exposure to rain;

d ) The effectiveness of any water removal device;

e ) Assess the effectiveness of equipment packaging.

3.3   Restrictions

This experiment:

A ) Does not include the rain corrosion test procedure;

b ) Not applicable for assessing the suitability of aircraft windshield rain removal systems;

c ) Not applicable for evaluating pressure flushing or purification devices;

d ) is insufficient to determine the long-term effects of prolonged exposure to rain or to assess minor condensation droplets forming on the upper surface of the equipment (less than 140L/m²/h )’s impact.

3.4  Determine the test conditions

3.4.1    Rainfall intensity

The rainfall intensity to be used can be determined based on the intended application area and duration of use. Recommended 1.7mm/min The intensity of the rainfall.

3.4.2    Raindrop size

Using a raindrop diameter of 0.5 mm to 4.5 mm Between the ranges.

3.4.3    Wind speed

During heavy rainfall, it is usually accompanied by 18m/s The recommended wind speed is [insert specific value or unit here], unless otherwise specified or when steady-state conditions have already been established.

3.4.4   Specimen Exposure Surface

Wind and rain typically have a greater impact on vertical surfaces than on horizontal ones, while the effect is reversed for rain falling at or near a vertical angle. All surfaces exposed to either rain or wind during testing should be fully subjected to the test conditions. Additionally, the test specimen should be rotated throughout the trial to ensure that every vulnerable surface is consistently exposed to the specified environmental conditions.

3.4.5   Preheating temperature

The temperature difference between the test specimen and rainwater can affect the results of the rain exposure test. For sealed specimens, at the start of each exposure cycle, the specimen should be heated to a temperature higher than that of the water. 10 °C , creating negative pressure inside the specimen, which allows for a more effective inspection of its water tightness.

3.4.6      Experimental Procedure

A ) If the temperature difference between the water and the specimen is less than 10 °C , the test specimen can be heated to a temperature higher than that of the rainwater, or the water temperature can be lowered. At the start of each exposure test cycle, ensure the specimen’s temperature stabilizes above the water temperature. 10 °C ±2 °C At the temperature. Before the test begins, return the specimen to its normal operating condition.

b ) When the specimen is placed within the testing apparatus and operating under its normal conditions, adjust the rainfall intensity according to the technical documentation.

c ) Begin ventilation at the wind speed specified in the technical documentation and maintain it for at least 30min。

d ) If inspections are required during the trial, they can be conducted at 30min The end of getting drenched in the rain 10min Inside Proceed.

e ) Rotate the specimen so that any other surface that might be exposed to rain and windblown rain during the test cycle is fully subjected to these conditions.

f ) Repetition A ) ~ e ) Until all surfaces of the specimen have been subjected to the test.

g ) If possible, perform the specimen appearance quality check inside the test chamber; otherwise, remove the specimen from the chamber for inspection. If water has already seeped into the specimen, a careful assessment must be made before proceeding with testing. To prevent safety hazards, it is essential to drain any accumulated water inside the specimen and measure the volume of water discharged.

h ) Measure and record any free water found within the specimen's protective zone.

I ) If requested, perform the test specimen work to determine compliance with the technical documentation, and record the results.

The common feature of the three tests above is that the rainfall amount is essentially the same, all occurring at 100L/m² ·h Left and right (Note: 100L/m² ·h = 1.67 mm/min ), The difference lies in the varying requirements for water temperature, wind speed, and droplet size.

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