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BEIHAI YUEDA FRP PRODUCTS
Introduction to the Forming Process and Layer Structure of Fiberglass Tanks
Release time:
2022/09/27
Fiberglass tanks are a type of non-metal composite material tank body made from resin and fiberglass through microcomputer-controlled winding machines. Below is an introduction to the molding process of fiberglass tanks and the layered structure of the tank walls. The advent of large-diameter fiberglass winding technology has allowed fiberglass to develop towards large storage tanks. Compared to traditional horizontal winding processes, vertical winding technology solves the problem of not being able to wind large-diameter products as a whole, requires less space during production, and allows for a maximum tank diameter of up to 25 m. The advantages of vertical winding are reflected in the following four aspects: (1) It enables the winding of large-diameter products. (2) The inner layer, structural layer, and outer layer are formed in one go, with no longitudinal seams in the lining, which improves the strength of the product. (3) In addition to circumferential winding, spiral winding is introduced during the winding process. The winding angle can be designed according to the stress conditions of the product, adjustable between 65° and 85°. Spiral winding breaks through the traditional concept that fiberglass products belong to laminated structures, not only improving the axial strength of the product but also greatly enhancing the structural performance of the tank, such as interlayer shear strength, bending strength, creep resistance, wind resistance, and earthquake resistance. (4) The product is vertically demolded, avoiding inversion during the demolding process, ensuring product quality. The curing system uses methyl ethyl ketone peroxide (MEKP) and cobalt salt for room temperature curing, supplemented by infrared heating for rapid curing, significantly reducing energy consumption during the curing process. A reasonable layering structure is a good guarantee of the strength and corrosion resistance of fiberglass. The tank wall of the fiberglass storage tank consists of the following three layers: (1) Inner layer: Composed of a resin-rich layer and an intermediate layer. The resin-rich layer is reinforced with organic fiber polyester felt and has a resin content of over 90%, with a thickness of about 0.5 mm. This layer has good air tightness and is very smooth, mainly providing corrosion resistance and impermeability. The intermediate layer is composed of lining resin and alkali-free glass fiber spray yarn, with a resin content of 70%-80% and a thickness of about 2 mm. The main function of this layer is to protect the resin-rich layer, enhance the inner layer's ability to withstand internal pressure failure, and prevent crack propagation. (2) Structural layer: Also known as the reinforcement layer, it uses untwisted glass fiber yarn and is reinforced with glass fabric (or chopped fiber felt) to withstand tensile stress, compressive stress, and various external loads, protecting the inner layer. The resin content is 30%-40%, and its thickness is determined based on load conditions. Adding an appropriate amount of filler to the resin can improve the wear resistance of the fiberglass. (3) Outer layer: Also known as the outer resin-rich layer, with a resin content greater than 90% and a thickness of about 1.5 mm. It is reinforced with glass fiber surface felt, and sometimes thin glass strips of 0.1-0.2 mm can also be used for reinforcement, while UV absorbers are added to the resin to prevent aging. This layer mainly protects the outer wall from external mechanical damage and provides UV protection. This concludes the introduction to the molding process and layered structure of fiberglass tanks. We hope this information is helpful to everyone. Guangxi Fiberglass Products Co., Ltd. is a professional manufacturer of fiberglass products, and our products are well-received by users. We welcome inquiries.
Fiberglass tanks are a type of non-metal composite material tank body made from resin and fiberglass wound by microcomputer-controlled machines. Below is an introduction to the molding process of fiberglass tanks and the layered structure of the tank wall.
The advent of large-diameter fiberglass winding technology has allowed fiberglass to develop towards large storage tanks. Compared to traditional horizontal winding processes, vertical winding technology solves the problem of not being able to wind large-diameter products as a whole, requires less space during production, and the maximum diameter of the tank can reach 25 m. The advantages of vertical winding are reflected in the following four aspects:
(1) It can achieve the winding of large-diameter products.
(2) The inner layer, structural layer, and outer layer are formed in one go, with no longitudinal seams in the lining, which improves the strength of the product.
(3) In addition to circumferential winding, spiral winding is also introduced during the winding process. The winding angle can be designed according to the stress conditions of the product, adjustable between 65° and 85°. Spiral winding breaks through the traditional concept that fiberglass products belong to laminated structures, not only improving the axial strength of the product but also greatly enhancing the structural performance of the storage tank, such as interlayer shear strength, bending strength, creep resistance, wind resistance, and earthquake resistance.
(4) The product is demolded vertically, avoiding inversion during the demolding process, ensuring product quality. The curing system uses methyl ethyl ketone peroxide (MEKP) and cobalt salt for room temperature curing, supplemented by infrared heating for curing and forming in a short time, significantly reducing energy consumption during the curing process.
A reasonable layering structure is a good guarantee for the strength and corrosion resistance of fiberglass. The tank wall of the fiberglass storage tank consists of the following three layers:
(1) Inner layer: composed of a resin-rich layer and an intermediate layer. The resin-rich layer is reinforced with organic fiber polyester felt and has a resin content of over 90%, with a thickness of about 0.5mm. This layer has good air tightness and is very smooth, mainly providing corrosion resistance and impermeability. The intermediate layer is composed of lining resin and alkali-free glass fiber spray yarn, with a resin content of 70%-80% and a thickness of about 2mm. The main function of this layer is to protect the resin-rich layer, improve the inner layer's ability to withstand internal pressure failure, and prevent crack propagation.
(2) Structural layer: also known as the reinforcement layer, uses untwisted glass fiber coarse yarn, reinforced with glass fabric (or short-cut fiber felt), bearing tensile stress, compressive stress, and various external loads, protecting the inner layer. The resin content is 30%-40%, and its thickness is determined based on load conditions. Adding an appropriate amount of filler to the resin can improve the wear resistance of fiberglass.
(3) Outer layer: also known as the outer resin-rich layer, with a resin content greater than 90%, and a thickness of about 1.5mm. It is reinforced with glass fiber surface felt, and sometimes thin glass strips of 0.1-0.2mm can also be used for reinforcement, while ultraviolet absorbers are added to the resin to prevent aging. This layer mainly protects the outer wall from external mechanical damage and provides UV protection.
The above is an introduction to the molding process and layered structure of fiberglass tanks, hoping to be helpful to everyone. Guangxi Fiberglass Products Co., Ltd. is a manufacturer specializing in the production of fiberglass products, and our products are well received by users. We welcome inquiries.
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