Dew Point Measurement is Very Important in Plastic Drying

What is the Feature of Plastic ?

Plastic is a synthetic high molecular polymer that can be arbitrarily molded into products of different shapes. Thermoplastics do not undergo chemical change in their composition when heated and thus can be molded repeatedly. Examples include polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC).

The plastic bottles we often drink such as bottled water and beverages are made of PET. The Plastic Bottle Making Process includes:

①Stretching the Preform

②Stretching the Preform

③Cooling and Trimming.

Cooling is important for the process of Plastic Bottle Making. Lower air dew point, the viscosity is high, and vice versa.

The PET strength will influent the viscosity. The plastic bottle is easily broken that made of less viscosity pet.

Why Dew Point Measurement is So Important in Plastic Production ?

In short, we Have to say, Dew point measurement is very important in drying systems for plastic production as it helps to ensure that the plastic being dried is completely free of moisture.
Because if there is moisture in the plastic, it will cause many problems, including reduced strength and durability, reduced quality of finished products, and even defects such as cracks and warping.

Then Why do know Dew point measurement is very important ?

In fact, most of plastic manufacturers and processors alwasy to use various methods to dry plastics, such as hot air dryers, adsorption dryers and vacuum dryers. However, usually, they only do simply applying heat or using a desiccant such as silica gel may not be enough to completely remove moisture from the plastic. This is method is not correct, because the moisture content in the plastic is not only affected by the drying method, but also by environmental conditions such as temperature and humidity. so that means, we need exactlly know how much moisture still in the plastic materials.

We started using a dew point tester to determine the moisture content in the surrounding air, which can have a major impact on the plastic drying process. The dew point is the temperature at which water vapor in the air begins to condense into a liquid. By measuring the dew point, plastic manufacturers can ensure that the drying environment is dry enough to completely remove the moisture from the plastic.

Anyway, If the dew point value is too high, moisture may still be present in the plastic even after the plastic has gone through the drying process. So it can lead to defects, loss of strength and reduced durability in the finished product. But if you can ensure that the dew point is low enough, the plastic will be completely free of moisture, allowing you to produce a high quality, durable product.

In summary, dew point measurement is essential in the plastic drying process as it helps us ensure that the plastic being dried is completely free of moisture, which is critical to the quality and durability of the finished product.

Therefore, dew point transmitter is vital for plastic injection industry. HENGKO HT608 serious dew point transmitter are suitable for installation in compressed air systems and pipelines with an operating pressure of up to 8 bar and precisely measure the dew point temperature down to 60℃~80℃（-76- 176°F）.Compare with other dew point transmitter, HT608 series with data recording function (65000 datas) and our exchangeable probe can be easily removed and replaced with a new one without having to adjust the transmitter, which allows for easy and quick recalibration of the transmitter. It is an ideal for OEM application.

As industrial production processes become ever more demanding, the requirements for compressed air treatment and drying processes are also on the rise. HENGKO reliable dew point transmitter have advantage of fast response time (1s), good long-term stability and almost zero error that ensuring that ensure the entire production process runs smoothly and safeguarding a high level of product quality.