The standard IS 3071:1981 outlines specifications for wooden crates intended to package items weighing up to 500 kg, which do not require the full protection of wooden packing cases. It details requirements for design, materials, construction methods, and workmanship to guarantee sufficient strength, stiffness, and protection during handling and transit. This code is crucial for professionals involved in the design and manufacture of wooden crates handling various load categories including easy, average, and difficult.
Overview
The standard IS 3071:1981 outlines specifications for wooden crates intended to package items weighing up to 500 kg, which do not require the full protection of wooden packing cases. It details requirements for design, materials, construction methods, and workmanship to guarantee sufficient strength, stiffness, and protection during handling and transit. This code is crucial for professionals involved in the design and manufacture of wooden crates handling various load categories including easy, average, and difficult.
Audience
Contents
Structure
IS 3071 establishes the scope and essential specifications for wooden crates used in packaging articles up to 500 kg. It references definitions from IS 707-1976 and IS 6703-1972, and prescribes rounding off test results per IS 2-1960 ensuring consistency in significant digits.
Terminology aligns with IS 707-1976 (Timber Technology) and IS 6703-1972 (Wooden Packaging Terms). Surrounding battens, denoted as 'd' members, are girth battens attached to the crate frame. Rounding off test outcomes is performed per IS 2-1960.
Details on selecting timber species with moisture content not exceeding 18%, grain inclination limits, and absence of defects. Frame member sizes and nail specifications are provided based on crate classes A to F, ensuring durability and joint integrity.
Crates are categorized into six classes (A-F) according to frame member dimensions, load weight, and load type (easy, average, difficult). Timber groups I, II, and III correspond to varying strength and durability levels to match crate class requirements.
Guidelines for frame member dimensions, nail sizes matched to thickness, and construction practices such as diagonal bracing and corner joint techniques to enhance crate stability and load-bearing capacity.
Standards specify preservative treatment for non-coniferous timber using a 10% copper napthenate solution dip for five minutes. Nail size requirements and rounding of test values adhere to IS 2-1960.
Details on the preservative dipping process for non-coniferous wooden shooks, emphasizing the use of copper napthenate solution and conditions for alternative preservatives requiring purchaser approval.
Marking mandates include indelible labels or stencils on crate bundles showing manufacturer’s name or trademark, production year, class, and size. The use of the ISI Certification Mark is permitted under license, ensuring compliance with quality standards.
Supplementary tables and explanations covering crate classes correlated with load types and weights, timber groupings, and strength requirements for different frame members and load conditions.
Defines load categories—easy, average, and difficult—based on density, fragility, and shape. Crate class selection factors in load mass and timber group to ensure appropriate design for intended use.
Explanation of strength as the crate’s ability to carry loads combined with constructional stability and resistance to deformation. Emphasizes selecting appropriate timber groups and incorporating diagonal braces, edge members, and struts for optimal rigidity.
Frequently Asked
Per IS 3071 Clause 3.1, timber used must be selected from Groups I, II, or III as defined in IS 6662-1980, which classifies timber suitable for wooden packaging. Other timber species may be used only with prior written consent from the purchaser. Essential quality criteria include moisture content not exceeding 18%, grain inclination within 1:10, and absence of pith, insect damage, rot, or harmful defects.
IS 3071 categorizes crates into classes A through F considering the load type—easy, average, or difficult—and the weight of the contents. Easy loads involve lightweight, strong items; average loads are moderate in weight and fragility; difficult loads include heavy, fragile, or irregularly shaped goods. The classification table matches mass ranges with crate classes and timber groups to ensure strength and protection align with the load characteristics.
To ensure crate rigidity, IS 3071 advises using strong corner joints such as three-way locked corners where edge members are nailed in both directions. Box-type corners involve nailing on wide faces and side grains appropriately. Diagonal braces inside the crate enhance resistance to racking, while equidistant struts provide additional stability. Consistency in timber species is required, avoiding mixing coniferous and non-coniferous woods, and proper nailing techniques ensure structural integrity.
Preservative treatment must be applied after the timber has been seasoned to a moisture level not exceeding 18%, ensuring effective absorption. Treatment methods include pressure or dip applications using approved preservatives like a 10% copper napthenate solution in white spirit, with a dipping duration of five minutes for non-coniferous timber. Treatments are necessary to protect against decay, insect damage, and fungal growth, especially for crates exposed to moisture.
IS 3071 specifies that plain head nails conforming to IS:723-1972 must be used, with a minimum of two nails per frame member end. Nails should be driven without causing splits and positioned approximately 20 mm from edges. For thicker members, nails may be staggered in rows to enhance joint strength. Nail dimensions depend on the frame thickness, ranging from 50 mm length for 16 mm thick members to 115 mm for 40 mm thick components, ensuring secure and durable joints.
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