Simulated Drop Test of Woven Bag – Hidden facts and details

Drop testers are a great way to test the durability of your products. Using a drop tester, you can ensure that your products will last longer and not be damaged during shipping. This is important because damaged products can lead to negative customer feedback and lost sales.

Many different drop testers are available on the market, so it is essential to find one that fits your needs. Some drop testers use weights to simulate impact. 

Using a drop tester, you can ensure that your products are safe and effective.

When testing products, it is essential to use a method to ensure they are safe and effective. One way to do this is to use a drop tester. You can ensure that every product you create is both using this tool. It is because a drop tester can accurately measure the pressure needed to cause a reaction in your product. This information can assist you in ensuring that your products are safe for use and effective in their intended purpose.

Two types of drop performance tests may be undertaken on finished packs: drop testing and field trials.

Drop test of woven bag

Drop testing consists of dropping a filled package, generally until breakage occurs. Various constructions or materials may be compared for performance in the same size of sacks. The sacks can be filled with either the normal or the dummy contents. Drops may be onto the faces (flat drops), the ends (butt drops), or a series of different drops. Drop testing is not a final assessment of sack strength. It must always be comparative, i.e., between two or more sets of sacks, one of which should be a control set of a sack construction that has given satisfactory performance.

Drops from sacks should be conditioned immediately before testing to ensure accurate results. If possible, testing should occur in a conditioned environment to minimize the effects of extreme temperature and humidity conditions.

The major factors which influence drop test results are:

• Weight of the contents

• Type of the product

• Sack construction

• Woven or Sack type

• Degree of filling

But dropping the filled sacks repeatedly onto one end until bursting occurs will test the girth of the bag but puts no strain on the end closures.

The results will indicate differences in body strength only.

Flat dropping will stress the whole sack, i.e., the body and the end closures. Such testing may be used to show differences in performance between different types of bags and other constructions.

There are three ways in which drop tests may compare sacks:

Static drop height method. 

Here a height is chosen at which a set of sacks will survive a reasonable number of drops before bursting. The group under test is dropped from the same height, and the average number of drops to breakage is determined.

Elevator drop height method. 

The first drop is made from a height of 0.85 m, and the height of each subsequent drop is increased by 150 mm until breakage occurs. If sacks reach the maximum height of the drop tester without breaking, usually about 4 m, drops are continued at the maximum height until bursting occurs. In practice, this approach is better than the static drop height method, which can be highly protracted if the sack constructions are appreciably different in strength.

Drop sequence method. A drop test sequence, comprising drops from a predetermined height onto the face, butt, and side in succession, has been proposed as an international means of establishing a minimum standard for sacks, and other forms of packaging, containing goods classified as dangerous. Users should be aware that while this test shows a minimum standard, it does not establish that particular construction is suitable for any specific distribution system. The hazards and journey lengths in distribution systems vary widely. A user should always consider a preliminary limited field trial if there is no prior experience with a particular distribution system. ISO 7965 1984 currently applies.

Field trials

Field trials are advisable with distribution systems involving multiple handling stages. Such a trial only consists of a small initial consignment checked at despatch and upon arrival at the destination. Field trials in which consignments are monitored at various points within a distribution system can require many observers and be expensive to undertake.

This type of trial is only justified for complex or lengthy distribution systems in which initial trial consignments have shown unacceptable performance levels or damage. The final analysis of the findings of such a trial should determine the sources of any damage and whether the need is for improvement in sack strength or the elimination of particular distribution hazards.

Accidental or purposeful dropping or striking containers during handling, loading, and unloading is the prime source of damage to most packages under 200 lb. ASTM test method D5276, Drop Test of Loaded Containers by Free Fall, describes this hazard’s equipment and methodology for conducting a laboratory simulation. 

All shipping containers may be tested, including boxes, cylindrical containers, bags, and sacks. Accuracy of the drop-test equipment is specified, including a requirement for impact surface mass of at least 50 times that of the heaviest container to be tested. The method may be used to check the ability of the container to survive free fall, evaluate the protective capability of the container and inner packing, compare the performance of different package designs, or permit observation of progressive failure of a container and damage to its contents.

An alternative to free-fall drop is the ASTM test method D5487, Simulated Drop of Loaded Containers by Shock Machine. This method provides a more accurate package positioning for impacts, mainly flat hits where the shock transmitted to package contents is usually most significant. While the shock machine method is precise for most applications, rigid package systems are not recommended for testing by this method (where ‘‘rigid’’ means a natural frequency above 83 Hz for the system).

ASTM Standard D6179, Rough Handling of Unitized Loads and Large Shipping Cases & Crates, contains several test methods that are particularly suited to reproducing handling hazards for either unitized loads or large containers. These test methods cover testing the integrity of unitized loads and significant shipping cases and crates and the ability of the contents to endure rough handling. Not all test methods apply to all products, containers, and loads. These test methods apply to standard means of material handling as follows:

Free-Fall Drop Test. It utilizes a quick-release hook and sling for equipment to drop test on any container surface.

Rotational Edge-Drop Test. One end of the specimen is supported on a block while the opposite end is raised to a specified height and then dropped to the floor.

Corner Drop Test. One bottom corner is supported on a block while the diagonally opposite bottom corner is raised to a specified height and then dropped to the floor.

Raised-Edge Drop Test. One end of the specimen is raised to a specified height while the opposite end rests on the floor, and then the raised end is dropped to the floor.

Rolling Test. It determines the ability of a container to withstand the effects of rolling.

Tip Test. It determines the ability of tall or top-heavy containers to resist tipping over.

Tipover Test. It determines the protective ability of loaded shipping containers when subjected to tip-over impacts.

ASTM Standard D6055, Mechanical Handling of Unitized Loads and Large Containers or Crates, provides methods of testing handling capabilities using lift trucks, grab hooks, or slings. A test course and methodology are described for taking tests by four types of lift trucks: fork, spade, clamp, and push-pull.

ECT vs. Compression Test vs. Stack load Test

Vihaan Nagal

संवेष्टन अभियान्ता | Packaging Engineer | Verpackung Ingenieur *Free time blogger *Believe in packaging reform (say naa to orthodox packaging) My life lies between degradable and non-degradable material.

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