When it comes to Industrial Goods Packaging Inspection Among the common tests conducted is the sine constant-frequency vibration (repeated impact) test, which is primarily used to evaluate the ability of industrial product transport packaging—when not secured to the vehicle floor—to withstand repeated impacts caused by sinusoidal vibrations during transit, as well as the packaging's effectiveness in protecting the contents inside.

I. Principle of the Experiment

Place the test sample on a vibration table and subject it to approximate, fixed low-frequency sinusoidal oscillations to induce vibration. The temperature and humidity conditions during the test, the duration of the experiment, the maximum acceleration, as well as the placement and securing method of the test sample, are all pre-determined. Industrial Goods Packaging Inspection Additionally, when necessary, a specific load can be applied to the test sample to simulate the conditions of sinusoidal vibration experienced by a transport package when placed at the bottom of a stacked arrangement.

• Relevant standards and test methods

1. Test Standards

1. Method Standard

GB/T 4857.7-2005 Method B ， ASTM D999-2008 (2015) Method A1 And A2。

2, Program Standards

ISTA 1A-2014 (2016) ， ISTA 1B-2014(2016) ， ASTM D4169-16 Schedule F ， GJB 2711-1996 Method 9。

II. Test Methodology  

1. Method Standard

1.1 GB/T 4857.7-2005 Method B

Operate the vibration table to generate an adjustable range of acceleration, which can cause the test sample to detach from the table surface. Causing relative impact 。

Select the preset amplitude (In most cases, choose an amplitude of 25mm ) , begin to subject the test samples to 2 Hz Vibrate at the specified frequency, gradually increasing it until the test sample is on the verge of separating from the vibration table.

Note : During the test, move along the bottom of the test sample. 1.5mm To 3.0mm Thick , with a minimum width of 50mm The standard measuring instrument is At least one-third The portion of the test sample's base area, this standard measuring tool Can be inserted , which is considered the state where the test sample has become detached from the vibration table.

1.2  ASTM D999-2008 (2015) Method A1 And A2

Method A1 For vertical vibration, the method A2 Vibration with rotational motion. Unfortunately, the equipment in this laboratory does not meet the requirements of the method. A2 The experimental method. Therefore, our lab can only carry out the method A1 The trial.

With 2Hz The frequency is initiated on the vibration table, and the frequency is steadily increased until the metal shim (standard gauge) can be inserted beneath one of the long sides of the package—and then moved along the entire length of that side. Intermittent movement . When inserting, use the gasket It must be flat. , rather than at a fixed angle.

When determining the appropriate testing frequency, the metal gasket must be inserted beneath the package. At least 100 mm ( 4 inches ) The location.

Requirements for metal sheets (standard measuring tools):

Width: ≥50mm ( 20in. )

Thickness: 1.6 mm (1/16 in.)

Length: ≥254 mm (10 in.)

1.3   The main differences between the two method standards

The main differences are concentrated in 3 In one aspect:

First: The stated insertion depths of standard measuring tools vary, GB/T 4857.7-2005 Require at least one-third insertion, ASTM D999-2008 (2015) Require at least insertion 100mm。

Second: The standard measuring tools move differently, GB/T 4857.7-2005 The requirement is simply that it can be inserted. ASTM D999-2008 (2015) The requirement is that it should be able to move intermittently after insertion.

Third: Standard measuring tools come in different sizes, GB/T 4857.7-2005 Required thickness is 1.5mm To 3.0mm， ASTM D999-2008 (2015) Required thickness is 1.6 mm (1/16 in.) 。

2. Program Standards

2.1   ISTA 1A-2014 (2016) And ISTA 1B-2014(2016)

ISTA 1A-2014 (2016) And ISTA 1B-2014(2016) Reference test method ASTM D999-2008 (2015) The method A1。

1A And 1B The difference lies in the varying number of impacts, which in turn leads to differences in impact duration.

ISTA 1A-2014 (2016) ： Impact Time = 14200 Next time Rounds per minute CPM Or revolutions per second ×60

ISTA 1B-2014(2016) ： Impact Time = 11800 Next time Rounds per minute CPM Or revolutions per second ×60

2.2   ASTM D4169-16 Schedule F

ASTM D4169-16 Schedule F The testing method also follows the reference. ASTM D999-2008 (2015) The method A1 Or A2 It simply adds vibration testing requirements.

Vibration times are shown in the table. 1 As shown:

Table 1 Vibration Time

Method for allocating vibration time: The vibration time in the transport direction accounts for a portion of the total vibration time. 50% , other possible transport directions account for the remaining portion of the total vibration time 50%。

For example: If the test level is Level II , there is risk during transportation 3 The direction of transportation. Thus, time allocation primarily aligns with vibrations in the main direction of transport. 20min Additionally, the other one 2 Each direction of transport vibrates separately. 10min , total 40min。

2.3   GJB 2711-1996 Method 9

GJB 2711-1996 Method 9 With GB/T 4857.7-2005 Method B Similar, yet only 1 The key difference lies in the varying thickness specifications for standard measuring tools. GJB 2711-1996 Method 9 The standard measuring instrument has a fixed value of 1.5mm And GB/T 4857.7-2005 Method B The middle represents a range.

GJB 2711-1996 Method 9 It also specifies the test duration:

The total vibration time for the test sample with only one placement condition is 120min；

The total vibration time for several test samples placed in different states is 180min Each vibration time for every placement state is evenly distributed.

Industrial products differ from other goods in that they have unique characteristics—they are typically purchased by industrial clients and group buyers, fostering a close relationship between suppliers and buyers. Their target customer base is relatively well-defined, with fewer buyers making larger-volume purchases. Industrial Goods Packaging Inspection The center has also accumulated three decades of rich experience, enabling it to conduct various types of tests and provide personalized services to customers.