{"id":3072,"date":"2026-07-10T17:06:45","date_gmt":"2026-07-10T09:06:45","guid":{"rendered":"http:\/\/www.offrayribbons.com\/blog\/?p=3072"},"modified":"2026-07-10T17:06:45","modified_gmt":"2026-07-10T09:06:45","slug":"how-to-test-the-strength-of-a-packaging-card-4c51-5623f5","status":"publish","type":"post","link":"http:\/\/www.offrayribbons.com\/blog\/2026\/07\/10\/how-to-test-the-strength-of-a-packaging-card-4c51-5623f5\/","title":{"rendered":"How to test the strength of a packaging card?"},"content":{"rendered":"

As a packaging card supplier, I understand the importance of creating packaging that not only looks appealing but also provides adequate protection for the products inside. One crucial aspect of ensuring the quality of packaging cards is to test their strength. In this blog post, I will share some effective methods for testing the strength of a packaging card, drawing on my experience in the industry. Packaging Card<\/a><\/p>\n

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Understanding the Importance of Packaging Card Strength<\/h3>\n

Before delving into the testing methods, it’s essential to understand why testing the strength of a packaging card is so important. Packaging cards serve as the first line of defense for the products they contain. They need to withstand various stresses during transportation, storage, and handling. These stresses can include compression forces from stacking, impact forces from dropping or collisions, and tensile forces when the package is opened.<\/p>\n

If a packaging card is not strong enough, it can lead to a range of issues. The product inside may be damaged, which can result in returns, customer dissatisfaction, and financial losses. Additionally, weak packaging can also affect brand reputation. Customers expect their purchases to arrive in good condition, and a damaged package can create a negative impression.<\/p>\n

Testing the Compression Strength<\/h3>\n

One of the most common types of stress that packaging cards face is compression. Compression can occur when packages are stacked on top of each other during storage or transportation. To test the compression strength of a packaging card, we can use a compression testing machine.<\/p>\n

Here’s how the test is typically conducted:<\/p>\n

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  1. Sample Preparation<\/strong>: Cut a sample of the packaging card into a specific size and shape according to the testing standard. For example, a common sample size is a square or rectangular piece with specific dimensions.<\/li>\n
  2. Loading the Sample<\/strong>: Place the sample between the platens of the compression testing machine. The platens are flat surfaces that apply force to the sample.<\/li>\n
  3. Applying the Force<\/strong>: Start the machine, and it will gradually increase the force applied to the sample until the sample fails. The failure point is usually defined as the point at which the sample collapses or shows significant deformation.<\/li>\n
  4. Recording the Results<\/strong>: The testing machine will record the maximum force applied to the sample before failure. This value is known as the compression strength of the packaging card.<\/li>\n<\/ol>\n

    It’s important to conduct multiple tests using different samples from the same batch of packaging cards to ensure the accuracy and reliability of the results. The compression strength can be affected by various factors, such as the type of paperboard used, the thickness of the card, and the manufacturing process.<\/p>\n

    Impact Testing<\/h3>\n

    Another critical test for packaging cards is impact testing. Impact can occur when a package is dropped or bumped during transportation or handling. To test the impact strength of a packaging card, we can use a pendulum impact tester.<\/p>\n

    The process of impact testing is as follows:<\/p>\n

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    1. Sample Preparation<\/strong>: Prepare a sample of the packaging card with a specific size and shape. The sample is usually a rectangular piece with a notch in the middle to ensure that the impact force is concentrated at a specific point.<\/li>\n
    2. Mounting the Sample<\/strong>: Mount the sample in the pendulum impact tester. The tester consists of a pendulum that swings and strikes the sample.<\/li>\n
    3. Releasing the Pendulum<\/strong>: Release the pendulum, and it will swing towards the sample, striking it with a specific amount of energy.<\/li>\n
    4. Measuring the Energy Absorbed<\/strong>: The tester will measure the energy absorbed by the sample during the impact. The energy absorbed is an indication of the impact strength of the packaging card. A higher energy absorption value means the card can better withstand impact forces.<\/li>\n<\/ol>\n

      Similar to compression testing, it’s advisable to conduct multiple impact tests on different samples to obtain accurate results. The impact strength can be influenced by factors such as the type of fibers in the paperboard, the density of the card, and the presence of any coatings or laminations.<\/p>\n

      Tensile Testing<\/h3>\n

      Tensile strength is also an important property of packaging cards. Tensile forces can occur when the package is opened or when there is a pulling or stretching action on the card. To test the tensile strength of a packaging card, we use a tensile testing machine.<\/p>\n

      The steps for tensile testing are as follows:<\/p>\n

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      1. Sample Preparation<\/strong>: Cut a sample of the packaging card into a strip with a specific width and length. The sample should be prepared in a way that it can be held firmly by the grips of the tensile testing machine.<\/li>\n
      2. Mounting the Sample<\/strong>: Place the sample in the grips of the tensile testing machine. The grips will hold the sample at both ends and apply a pulling force.<\/li>\n
      3. Applying the Tensile Force<\/strong>: Start the machine, and it will gradually increase the pulling force on the sample until it breaks. The machine will record the maximum force applied before the sample breaks.<\/li>\n
      4. Calculating the Tensile Strength<\/strong>: The tensile strength is calculated by dividing the maximum force by the cross – sectional area of the sample. This value indicates how well the packaging card can resist pulling forces.<\/li>\n<\/ol>\n

        Tensile strength can be affected by factors such as the fiber orientation in the paperboard, the bonding between the fibers, and the moisture content of the card.<\/p>\n

        Bursting Strength Testing<\/h3>\n

        Bursting strength is a measure of the ability of a packaging card to withstand internal pressure. This can be important when the package contains a product that may exert pressure on the inside of the card, such as a liquid – filled product or a product that expands.<\/p>\n

        To test the bursting strength of a packaging card, we use a bursting strength tester. The tester works by applying a hydraulic or pneumatic pressure to a circular area of the sample until it bursts. The maximum pressure at which the sample bursts is recorded as the bursting strength.<\/p>\n

        The testing process involves the following steps:<\/p>\n

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        1. Sample Preparation<\/strong>: Cut a circular sample from the packaging card. The sample should have a specific diameter as required by the testing standard.<\/li>\n
        2. Mounting the Sample<\/strong>: Place the sample in the bursting strength tester. The tester will hold the sample in place and apply pressure to the center of the sample.<\/li>\n
        3. Applying the Pressure<\/strong>: Start the tester, and it will gradually increase the pressure until the sample bursts. The pressure is measured continuously during the test.<\/li>\n
        4. Recording the Results<\/strong>: Once the sample bursts, the tester will record the maximum pressure applied. This value is the bursting strength of the packaging card.<\/li>\n<\/ol>\n

          Factors Affecting Testing Results<\/h3>\n

          Several factors can affect the results of the strength tests for packaging cards. These include:<\/p>\n

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          1. Moisture Content<\/strong>: Paperboard is hygroscopic, which means it can absorb and release moisture depending on the environmental conditions. A higher moisture content can significantly reduce the strength of the packaging card. Therefore, it’s important to control the moisture content of the samples during testing. Samples are usually conditioned in a controlled environment with a specific temperature and humidity for a certain period before testing.<\/li>\n
          2. Manufacturing Process<\/strong>: The way the packaging card is manufactured can also impact its strength. Factors such as the type of paper machine used, the pressing and drying processes, and the addition of chemicals or coatings can all affect the final strength properties of the card.<\/li>\n
          3. Raw Materials<\/strong>: The quality and type of raw materials used in the production of the packaging card play a crucial role in its strength. Different types of paperboard, such as kraft paper, recycled paper, or coated paper, have different strength characteristics.<\/li>\n<\/ol>\n

            Conclusion<\/h3>\n

            <\/p>\n

            Testing the strength of a packaging card is a vital part of ensuring the quality and performance of the packaging. By using methods such as compression testing, impact testing, tensile testing, and bursting strength testing, we can accurately evaluate the strength properties of the packaging card. Understanding the factors that affect the testing results can also help us make improvements in the manufacturing process and the selection of raw materials.<\/p>\n

            Industrial Carton<\/a> If you are in the market for high – quality packaging cards, I invite you to reach out for a procurement discussion. We are committed to providing packaging solutions that meet your specific requirements and ensure the safe transportation and storage of your products.<\/p>\n

            References<\/h3>\n