ASTM D5415-95(R2020) pdf free download

ASTM D5415-95(R2020) pdf free download.Standard Test Method for Evaluating Load Containment Performance of Stretch Wrap Films by Vibration Testing
1. Scope
1.1 This test method is used to evaluate and compare the ability of stretch-wrap films to contain unitized loads during shipping. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Significance and Use
4.1 This test method is intended to be used mainly as a means of comparing the performance of stretch-wrap films. It can also be used to compare the effectiveness of different wrap cycles with the same wrapping materials. No direct correlation between these test results and actual field performance has been established. 4.2 This test method simulates the shipping of unitized loads by way of truck and rail, concentrating on the vibration element associated with these modes. Other elements of the distribution system, such as mechanical handling, are not addressed specifically in this test method. 4.3 This test method establishes a method for rating the performance of films, but it leaves open to the discretion of the user the establishment of an acceptable rating for the specific end-use intended.
5. Apparatus
5.1 Load Wrapping Apparatus—A machine or apparatus to wrap the test load. The method of wrap application is prefer- ably as near as possible to that used in an actual production situation (stretch wrapper or manual wrapping unit). 5.2 Vibration Table—A vibration testing apparatus conform- ing to Test Methods D999, preferably equipped with the capability of varying the frequency or amplitude, or both, of vibration input in a controlled fashion and maintaining a set vibration mode. 5.2.1 The table shall be large enough and have a weight capacity sufficient to hold an entire wrapped shipping unit. 5.2.2 The table should have a means for attaching the bottom of the wrapped test unit securely to the table (for example, threaded holes in the table surface for bolting a pallet securely to the table). 5.3 Accelerometer (optional), to measure the output re- sponse of the test load at various vibration table input frequen- cies. This is the most accurate way of determining the resonant frequency of the test load.
6. Procedure
6.1 Prepare the test load. Arrange the units comprising the test load in layers and stack them in the manner normally used for shipping the product.6.2 When the units are normally shipped on pallets, stack the units on the pallet in the normal manner. 6.3 When the units are normally shipped on slip sheets without pallets, stack the units on slip sheets and affix the bottom layer to the slip sheet in the normal manner (glue, hot melt adhesive, and adhesion promoter). The slip sheet should have been fixed previously to a pallet surface to provide a means of securing the load to the vibration table. 6.4 Wrap the test load with the stretch-wrap film at a predetermined percent stretch and wrap cycle. 6.5 Allow the wrapped load to stand undisturbed for a minimum of 16 h before testing. This gives the stress retention forces in the stretched wrapping material time to equilibrate. 6.6 Place the test load on the vibration table and secure it firmly in place. 6.7 Perform a frequency sweep, and determine the resonant frequency of the entire wrapped test load. An accelerometer placed on top of the load monitored with a chart recorder or a storage oscilloscope is the most precise method of determining the resonant frequency. Alternatively, visual inspection can generally be used to determine the resonant frequency with sufficient accuracy. Further details of this resonance search test can be found in Test Methods D999, Method C. Perform the remainder of the test at the determined resonant frequently. 6.8 Begin the test with the vibration table at the resonant frequency ofthe load and at 0.5 G (see Note 1) input amplitude (zero to peak). Vibrate the test load for 10 min, watching for load shifting, tearing, or splitting of the wrapping material, or other loss of load integrity. If the load survives, adjust the amplitude to 0.75 G while maintaining resonant frequency.