How to Develop Liquid-Resistant Paper Straws
Time:2022-08-25
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Finding the Right Liquid-Resistant Paper Straw Adhesive is Critical
To ensure a paper straw does not unravel during use, there needs to be a strong liquid-resistant adhesive holding the paper together. The paper manufacturer, paper grade, machine type, and paper color are all variables to consider when choosing the right adhesive.
the adhesive solutions comply with direct liquid contact regulations. While submerged in a liquid, the adhesive provides strength to ensure the straw maintains its form. It is additionally important that the adhesive bond enables straw composting after a paper straw is used.
Paper Straw Test Methods
Paper straw manufacturing is affected by a range of challenges, including how the adhesive is applied to the paper, the type of equipment used, the use or not of a heater, and the machine speed. Quality control testing ensures the final paper straw meets quality requirements and safety standards. When conducting a quality control test, one must use the same paper at the same temperature, humidity, machine, operator, the same amount of glue at the same temperature and compare those results after the same drying time.
Fiber Tear Testing
A paper straw fiber tear test verifies that the amount of adhesive will enable production of a strong straw. The paper manufacturer can conduct this test themselves or work to do so as part of their quality control process. Assessing the fiber tear performance at the end of the line is the first test. Achieving fiber tear at the end of the line verifies that the machine is operating as expected and that the amount of adhesive used will form a strong bond. A strong bond is essential to water resistance.
Liquid-Resistance Testing
This test evaluates how long it takes for flagging, or unraveling, to occur when the straws are submerged in liquid. This is the most important quality control test. It is conducted a minimum of 24 hours after the adhesive is applied. To correctly assess paper straw liquid resistance, the straw must be placed in a certain direction in the liquid. It is advised that you test the straw in the liquid on the weak end, which is where the outer layer is uncovered, versus the strong end of the straw. Once the straw is in the water, it can be stirred occasionally and assessed for how long it takes for the straw to demonstrate signs of flagging.
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