The pioneer of upvc rooftile manufacturing in Iran!
+9120465839
Sales unit Connection
Why the roof of industrial sheds in the production line of raisin and other dried fruits are in danger of corrosion and damage? Raisin processing line and other drying fruits can be done by both natural and artificial methods. but due to the cost-effectiveness of the natural method that is Sun-dried raisins, almost every one can do it. However, in industrial method, due to the addition of sulfur dioxide and other gases, dried fruits, including golden raisins, may last longer.
While drying raisins, in addition to the heat of the dryers, the presence of preservative gases causes damage to the roofs, especially metals. So, if you are looking for an anti-corrosion and anti-heat roof for raisin industrial sheds and other dried fruits, keep on reading this article.
After drying the grapes, the water content of these raisins is decreased from 75% to almost 10%. So that for every 4 kg of grapes, almost 1 kg of raisins is gained. Before diving into how raisin production can damage the roof of industrial sheds, first let us look into the stages of manufacturing (golden) raisins. They are as follows – after selection and washing of the raisins:
To produce golden raisins, sulfur dioxide (SO2) is often used as a preservative and to maintain the golden color. The grapes may undergo a pre-treatment process where they are dipped or sprayed with a sulfur dioxide solution to prevent oxidation and retain the golden hue during the drying process. This stage is the main cause of corrosion in the metal roof of industrial sheds in raisin production.
The pre-treated grapes are spread out in a single layer on trays or racks and transferred to drying chambers. Industrial-scale drying methods include sun drying, dehydrators, tunnel dryers, or tray dryers. The grapes are subjected to controlled heat and airflow to remove moisture gradually over several days until they reach the desired moisture content. Temperature in this case increases up to the 50 to 55 centigrade.
The heat generated by the dryers in the process of making dried fruits and raisin increases the possibility of rusting the roof of industrial sheds.
Throughout the drying process, the grapes are monitored for moisture levels, color development, and quality. Technicians conduct regular checks to ensure uniform drying and prevent over-drying or under-drying of the fruit.
Once the grapes have reached the desired moisture content and color, they are cooled to room temperature to stop the drying process. The golden raisins are then stored in a controlled environment to prevent moisture absorption and ensure long-term shelf stability. Then they are packed into bags, boxes, or bulk containers ready for distribution.
During the drying process of raisins and some dried fruits in industrial sheds, vapors and gases can accelerate roof corrosion through several mechanisms:
The drying stage of raisin and dried fruits easily corrodes the roof of industrial sheds. It releases moisture into the air as the raisins lose water content. Elevated humidity levels within factory atmosphere can create a corrosive environment by promoting the formation of condensation on the factory roof. The presence of water droplets on metal surfaces can accelerate the corrosion process, leading to rust and degradation over time.
Some organic compounds are released during the drying of fruits, including acetic acid and other volatile organic compounds. They can react with atmospheric moisture to form acidic vapors. These acidic vapors can settle on the factory roof and corrode metal surfaces. This causes degradation and weakening of the roofing materials.
Sulfur-containing gases, such as hydrogen sulfide and sulfur dioxide, will be generated. They are during the drying process from natural sources or as byproducts of microbial activity. These sulfur compounds can combine with moisture in the air to form sulfuric acid. This is a highly corrosive substance that can accelerate the deterioration of metal structures in roof of raisin industrial sheds.
In some cases, salt particles present in the air. They are carried by the drying air from the raisin processing can deposit on industrial sheds roof. Salt contamination, combined with moisture, can create a corrosive environment. It promotes the development of rust and corrosion on metal roof structures.
Temperature fluctuations within industrial sheds during the drying process can exacerbate the corrosive effects of vapors and gases on the roof. Condensation forming on the roof due to temperature differentials can lead to the accumulation of moisture. Therefore It increases the risk of roof corrosion over time.
An anti-corrosion roof can effectively prevent the corrosion of the roof of raisin production factories. This is done by utilizing materials and coatings designed to resist the harmful effects of moisture, heat of dryers, salt and acidic environment.
UPVC (Unplasticized Polyvinyl Chloride) roofs are increasingly popular for raisin industrial sheds roof. Here are some of the unique properties:
UPVC roofs are highly resistant to moisture, gas, heat and humidity, which is crucial in regions where dried fruits are produced. They do not react with salt and acid which are often used in raisin factories. These sheets prevent water damage and heat from damaging the roof of raisin industrial sheds.
The panels are also known for their long lifespan and resistance to corrosion, UV rays, and extreme weather conditions. A uPVC roof can withstand the rigors of outdoor exposure without deteriorating, making it a long-term investment. Being lightweight, uPVC roof sheets simplify installation and reduce the structural load on industrial sheds. Hence they are cost-effective and suitable for various industrial applications.
Sepidfam Varna (polyroof) is the largest manufacturer of anti-corrosion and anti-heat roofs for all kinds of industrial applications and shed roofs in Iran. For more information about the price and the products, please contact our consultants:
WhatsApp: +98912 0465 839
