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TAPPI 844 Determining Construction of Corrugated Boards

TAPPI 844 package testing is used to determine the normal base weight of corrugated boards. As an ISTA and ISO 17025 certified lab, we realize the importance of T 844 corrugated board testing. Meeting the TAPPI 844 requirements can be difficult. We understand the challenges and guide companies through the process.

Keystone Compliance creates an accurate test plan to eliminate expensive over-testing. When packages do not meet the requirements, we assist with finding solutions. Keystone provides the peace of mind that all of your needs will be met. We are in constant communication throughout the test process. 

Request a quote and find out first hand about our competitive pricing, timely process, and outstanding reputation. Have a question about TAPPI 844 package testing? Contact us and we will determine the best course of action.

Summary of TAPPI Corrugated Board Information

This standard T 844 testing method is a procedure to determine the normal basis of weight in the components of corrugated shipping boxes and boards. Test specimens of corrugated fiberboard are treated with water. This is completed so that the component layers can be separated, dried, and weighed.

The goal of this test procedure is to identify the probable marketing grade under which the papers were likely sold. Not to be confused with determining the exact basis weights of the papers comprising a corrugated material.

The examination is performed on a single sample due to limitations in available material. The results can be affected from any damage or abrasions of the surface layers. Ideally, the sample is taken from a flat area of the board away from score lines.

Scope of TAPPI 844 Corrugated Board Testing

This method is applicable to all types of corrugated fiberboard. However, the surface layers of the specimen should be free from any damage or abrasions. This may lead to loss of fiber or otherwise impact the test results.

Since the board is immersed in water, there is typically no need to condition specimens before testing. In some cases, the results are checked by summing the measured weights of each component. Next, they are compared to the initial basis weight of the combined sample.

Significance of TAPPI 844 Construction of Corrugated Board Testing

During the procedure, the board is carefully cut to a known area. Then, the corrugated boards are cleaned with edges perpendicular to the faces of the corrugated cardboard. Different sizes are used for ease of calculation, balanced against the amount of material available for testing. Larger specimen sizes will reduce the impact of measurement error in the weighing stages relative to the final result.

The sample is then immersed in water long enough to cause the component layers to separate. While the papers are still wet, the adhesive is carefully removed from the layers.

The samples are removed from the water. Next, they are oven-dried and reconditioned until equilibrium is reached. Lastly, each component is weighed, and a report is written.

Boxplants, labs, and testing sites are usually called to determine what grades were used in the construction of a corrugated board sample. This determination is mostly used for sales and marketing purposes. This type of analysis does not provide information of the board’s strength or quality. It can be used to provide guidance to manufacturing facilities to make similar products.

The report details may include general information such as date, time, testing location and test engineer. Any conditions used, details of the package and other characteristics, and the number of failures will also be investigated. 

The nominal grade for each layer of the corrugated board is identified. Additionally, the nominal flute sizes, type and number of corrugated flutes per foot are reported. Each medium layer in the board structure is also included.

Expert TAPPI 844 Corrugated Box Package Testing

Keystone Compliance has a full scope of expertise including temperature validation, vibration, and high impact shock. We can accommodate flexible and rigid packages of all sizes, including large pallets. Our team strives to give our customers more time and energy on product development instead of testing. 

Ready to get started? Request a quote to see why so many companies work with Keystone to achieve their corrugated package testing needs.