The standard “TAPPI T 557 Water vapor transmission rate through plastic film and sheeting using modulated infrared sensor” developed by the Technical Association of the Pulp, Paper and Converting Industries (TAPPI) describes a procedure for determining the water vapor transmission rate through flexible barrier materials. The described test method is applicable to sheets and films of up to approximately 3 mm thickness, consisting of single or multi-layer synthetic or natural polymers and foils, including coated materials.
This procedure allows the determination of:
Water vapor permeability and water vapor permeability values should be used with caution. The water vapor transmission rate has an inverse relationship with thickness, and the direct relationship of the water vapor transmission rate to the partial pressure difference of water vapor may not always be valid.
The purpose of this test method is to obtain reliable values for the water vapour transmission rate of plastic films and sheets. The water vapour transmission rate is an important property of packaging materials and can often be directly related to the shelf life and stability of the packaged product.
Data obtained from this test method are suitable for use as a referee testing method if the buyer and seller agree on sampling procedures, standardization procedures, test conditions and acceptance criteria.
Infrared sensors use an external source of infrared radiation to detect objects. These sensors emit a beam of infrared radiation and measure the reflected radiation received by the sensor. Also, this process allows them to detect and identify objects accurately.
The operating procedure of an infrared sensor module includes the following steps:
Infrared sensors encompass different types, including pulsed, continuous wave, and modulated sensors, each with unique characteristics. Pulsed sensors emit short bursts of infrared radiation, measuring the reflection time. Continuous wave sensors emit a continuous beam, measuring frequency shifts in the reflected radiation.
Meanwhile, modulated sensors use complex modulation schemes that encode information in the emitted radiation and measure phase shifts in the reflection. These sensors offer a wide range of applications, including motion detection, proximity detection, and distance measurement. They also play an important role in various fields such as security systems, automatic lighting systems, and industrial automation.
Among the numerous tests, measurements, analyses and evaluation studies that our organization has carried out for businesses in various sectors, our organization also provides testing services defined in the standard “TAPPI T 557 Water vapor transmission rate through plastic film and cover using modulated infrared sensor” with its trained and expert staff and advanced technological equipment.
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