Plastic mesh bags, governed by the Chinese industry standard QB/T 3810-1999, provide a comprehensive framework for the production and quality control of these types of packaging materials. This standard outlines the classification of plastic mesh bags, detailing their structural characteristics and intended uses. It also specifies the technical requirements that these products must meet, including tensile strength, tear resistance, and dimensional stability.
The testing methods described in the standard ensure that each batch of mesh bags is evaluated for quality and performance before being released to the market. Inspection rules are clearly defined, covering sampling procedures, acceptance criteria, and the responsibilities of both manufacturers and users.
In addition to technical specifications, the standard includes guidelines for marking, packaging, transportation, and storage. These measures help maintain product integrity throughout the supply chain and ensure that the mesh bags remain in optimal condition until they reach the end user.
This standard applies specifically to mesh bags made primarily from polypropylene or polyethylene resins. The manufacturing process involves extrusion, drawing the resin into flat yarn, and subsequently weaving the yarn into a mesh structure. Such materials are widely used in agricultural, industrial, and commercial applications due to their durability, lightweight nature, and cost-effectiveness.
By following this standard, manufacturers can ensure consistency in product quality, while consumers can have confidence in the reliability and performance of the mesh bags they purchase.
Test Weight Water Bags
Test Weight Water Bags are also called water weights, load test water bags, lifting water bags, etc. A weighing water bag is mainly used in ship cranes, shipyard cranes, port cranes, offshore platform cranes, gantry cranes, driving cranes, davits, etc., lifting equipment for load detection. It is more efficient, safer and cheaper to detect than traditional solid weights.
â— High-frequency welding is used to make the DOING Load Testing Water Bags, and its outside is wrapped in high-strength fiber slings.
◠Crane Water Bags are made of high-density composite materials (PVC, TPU) with superior sealing and corrosion resistance. It can be used at -30°C to 70°C, and it will not be unable to use normally due to seasonal changes. The material is reinforced with anti-freezing, anti-oxidation, and anti-ultraviolet properties. It is not affected by seawater, chemicals, agents, oil stains, acid and alkali and aquatic organisms.
â— Water Bags for Weight can be folded during transportation, which greatly reduces space. Simple operation, light weight, small size, economical and practical, and long service life.
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