This document delineates the specifications for battens used in plywood tea-chests, covering aspects such as size, timber species, strength, and quality benchmarks. It serves manufacturers, quality inspectors, and engineers engaged in ensuring that battens meet durability and Indian standards compliance.
Overview
This document delineates the specifications for battens used in plywood tea-chests, covering aspects such as size, timber species, strength, and quality benchmarks. It serves manufacturers, quality inspectors, and engineers engaged in ensuring that battens meet durability and Indian standards compliance.
Audience
Contents
Structure
The standard defines the visual and dimensional quality requirements for battens and outlines the sampling procedures and acceptance criteria based on lot size, ensuring statistically valid quality control.
Key terms related to timber and battens are defined with reference to IS 707-1968 and related standards, including the identification of visual defects and sampling inspection criteria.
Lists the acceptable timber types for battens, including their botanical and trade names, with special recommendations for export-quality battens such as fir and spruce.
Specifies nominal sizes and allowable tolerances for length, breadth, and thickness of battens to ensure proper fit and uniformity in tea-chest construction.
Details sampling sizes, inspection procedures, defect acceptance limits, and moisture content conformity tests vital for maintaining batten quality.
Outlines requirements for surface smoothness, insect hole limitations, and end treatments, including special provisions for tea-chests used for instant tea packaging.
Describes the types of laboratory tests such as moisture content, compression parallel to grain, and static bending, including sampling sizes and evaluation formulas.
Specifies the mandatory marking information on battens and the optional use of the ISI certification mark, along with licensing and regulatory compliance.
Provides guidelines on batten cross-section dimensions, lengths as per tea-chest dimensions, and assembly instructions to ensure quality delivery.
Defines random sampling methodologies, sample sizes relative to lot size, and defect thresholds required for lot acceptance.
Details formulas for calculating averages and ranges in test results, conformity criteria for strength and moisture content, and the testing workflow.
Explains procedures for identifying, sampling, and handling defective battens, including moisture content evaluation and acceptance limits.
Describes the process and importance of obtaining ISI certification for battens, including licensing requirements and continuous quality surveillance.
Frequently Asked
The standard permits battens to be manufactured from any timber species listed in Appendix A, provided they meet the specified strength requirements. Notably, fir (Abies spp.) and spruce (Picea smithiana) are commonly recommended for export-grade battens, while species such as Acrocarpus fraxinifolius (mundani), Adina cordifolia (haldu), Albizia lebbeck (kokko), and others are also included.
Battens must comply with minimum static bending strength criteria. When tested at mid-span equal to one-quarter of the batten length, the breaking load should not be less than 3.5 to 4 × 10⁴ Newtons. These tests are conducted on full-length battens following the sampling and testing protocols outlined in the standard.
Moisture content is measured by taking 2 to 5 cm samples from the mid-length cross-section of battens, using either the oven-dry method as per IS 1708-1969 or a calibrated moisture meter applied at the center of the broad face. The moisture content should not exceed 15%. Samples are randomly drawn from battens that have passed visual and dimensional inspections.
Permissible defects include live knots up to 6.5 mm diameter, with no more than three knots per batten, situated at least 50 mm from ends and 5 mm from edges. Dead insect holes (pinholes) are permitted up to two per batten with a maximum diameter of 2 mm, whereas live insect holes or other defects like splits, twists, loose knots, spiral grain, or decay are prohibited.
Each batten must be clearly and permanently marked with the manufacturer's name and address or trademark, along with the month and year of manufacture. The ISI certification mark may also be applied, indicating compliance with Indian Standards. This mark signifies that the product is manufactured under a stringent quality control regime supervised by the Indian Standards Institution, with ongoing inspection and testing to ensure conformity.
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