Application of dehumidifier in industrial manufacturing industry

foundry industry

In this industry, wax molds are repeatedly soaked in clay, and these outer layers form molds. When the wax melts, molten metal can be poured in. Dry air (very low vapor pressure) is more commonly used to dry the clay layer than other heating sources, because dry air will not deform the wax molds when heated. The use of moisture absorbent dehumidifier can stabilize the operating cost of foundry in foundry industry and increase the manufacturing capacity, without slowing down the production pace in wet months, and the drying time of the process can be shortened by 50%.

Plastic resin drying

All plastic resins have some degree of hygroscopicity. When plastic raw material particles are extruded, moisture is heated and evaporated. These vapors will cause cracks in the plastic structure and appearance. Dehumidifier can reduce the humidity in plastic raw materials, improve the quality of finished products, reduce waste and increase manufacturing speed.

Candy coating

The process of icing sugar is very important for candy makers, and it is also a difficult process. The product is placed in a rotating drum, and the material to be coated is sprayed in the rotating drum for about one hour to make the outer layer have a certain thickness. The longer the process, the higher the chance of damaging the product. If the formula is based on chocolate or sensitive to temperature, dry air can be used to dry the coated surface while spraying the coating material to cool the surface. If the air is pre-dried by a dehumidifier first, heat will not be added to the surface of the product, and the surface vapor pressure difference will increase. This will enable manufacturers to maintain a fixed production speed throughout the year regardless of changes in external air.

The object absorbs moisture again.

There is some moisture in almost every substance, and even products such as plastic, resin and nylon can absorb 6-10% of its dry weight. Generally speaking, this is not a big problem, but sometimes moisture can cause product size changes and mutual adhesion problems.

Traditional household salt cans can illustrate this phenomenon. In wet weather, salt will stick to the mouth of the jar because of moisture absorption. This is not a serious problem at the dining table, but it will cause great problems for the product packaging machine.

Hygroscopic products are more sensitive to relative humidity than absolute humidity, and high relative humidity may appear at any time of the year. In fact, it is often higher in winter than in summer. The problem is particularly serious when products are stored or manufactured at low temperatures.

Here are some examples of typical industrial processes to prevent moisture from being sucked back.

Packaging of candy

Candy usually contains malt sugar and glucose, both of which are hygroscopic substances. When the relative humidity is high, the product will absorb moisture and become sticky. It is easy to stick to high-speed packaging machines and packaging materials and interrupt the production line. The control of temperature and humidity in candy packaging area is quite economical for candy manufacturers. The standard design conditions for this application are: relative humidity of 35% at a comfortable temperature.

Semiconductor and pharmaceutical clean room

When making microcircuits, hygroscopic polymers called photoresists are used to etch the circuit lines of the photomask. If moisture is absorbed, the microcircuit will be cut off or shorted, resulting in circuit failure.

In addition, in the pharmaceutical process, many powders are hygroscopic substances. When the humidity is high, it is difficult to handle and shorten the storage time. For these reasons, closed control of relative humidity can improve production speed and maintain product quality. Typical design conditions are 20℃ and relative humidity 25%.

Safety glass making

The transparent thin plastic sheet in the safety glass interlayer has strong hygroscopicity. The film that absorbs moisture will produce water vapor bubbles in the process. Closed control of relative humidity is very important in this process. The standard design conditions for this application are: relative humidity of 25% at a comfortable temperature.

air transportation

Operators of storage and transportation systems are most impressed by the influence of high humidity. Blockage of conveying pipes, deterioration of product quality and increase of maintenance times are some obvious results. Compressed air will increase the possibility of water vapor condensation in the air. When the components in the product absorb moisture, they will become sticky and accumulate in the conveying line, resulting in the above-mentioned results.

In order to solve the above problems, moisture absorbent dehumidification is widely used in industry as pre-drying air. The standard design condition is that the relative humidity is less than 50% at any dry bulb temperature.

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