This standard delineates the specifications, dimensions, production techniques, and testing protocols for veneered wood boards intended for packing cases. It is applicable to manufacturers, suppliers, and quality assurance personnel responsible for creating durable and dimensionally consistent veneered wood boards for storage and transportation packaging within India.
Overview
This standard delineates the specifications, dimensions, production techniques, and testing protocols for veneered wood boards intended for packing cases. It is applicable to manufacturers, suppliers, and quality assurance personnel responsible for creating durable and dimensionally consistent veneered wood boards for storage and transportation packaging within India.
Audience
Contents
Structure
This section defines the applicability of the standard covering dimensions, tolerances, and quality requirements for veneered wood boards intended for general packing uses. It references IS 707-1968 for terminology and sets out standard panel sizes and dimensional tolerances ensuring accuracy and suitability for structural and packing functions.
Details the primary references supporting the standard including dimensional tolerances and manufacturing thicknesses for veneered wood boards. It includes criteria for edge straightness and squareness testing to ensure compliance with the defined quality parameters.
Describes the two grades of veneered wood boards: Grade 1 for storage packaging and Grade 2 for transit packaging. Specifies the dimensional tolerances and nominal thickness breakdown between core and face veneers to meet the quality demands of different packing applications.
Outlines material specifications including tolerances on dimensions and nominal thicknesses for boards, core stocks, and face veneers. Also defines conditioning protocols for test specimens to stabilize moisture content prior to testing, ensuring consistency in quality control.
Specifies manufacturing requirements including standard nominal thicknesses for veneered wood boards and core and face veneer layers. Emphasizes dimensional tolerances and conditioning of test specimens for maintaining product uniformity and quality.
Sets workmanship standards requiring boards to be flat with reasonably smooth faces. Edges should be trimmed square within a tolerance of 3 mm. Dimensional tolerances for length, width, and thickness must be strictly observed to ensure high-quality finishes.
Specifies standard panel sizes and exact dimensional tolerances for length, width, and thickness. Describes permissible limits for edge straightness and squareness to guarantee precision and fit for veneered wood boards used in packing.
Provides guidelines for selecting sample boards for inspection based on lot size. Details dimensional tolerance checks and treatment processes including preservative dipping post-acceptance to maintain product durability and quality assurance.
Covers conditioning of test specimens, specimen sizing, thickness measurement methods with accuracy requirements, and reporting standards. Establishes protocols to ensure reliable and consistent results in thickness and adhesion testing.
Specifies moisture content and dimensional requirements for core timbers. Describes the momentary dipping treatment method using prescribed preservatives, quality control checks, re-testing procedures, and the implications of test failures on lot acceptance.
Details marking requirements including placement on the board face near edges. Discusses optional use of the ISI certification mark, conditions for its application, and reference to related official acts and annexures ensuring traceability and conformity.
Explains the significance of the ISI certification mark as a symbol of compliance with the standard under continuous inspection by ISI. Describes licensing requirements and quality assurance processes guaranteeing ongoing adherence to IS 4834 specifications.
Presents the procedure for assessing edge straightness using a straight edge and measuring maximum deviations. Describes methods to evaluate squareness between edges with tolerances ensuring dimensional accuracy critical for product quality.
Specifies measurement accuracy, instrument requirements, and designated test points on specimens. Details the process to calculate thickness variation and the acceptance criteria based on tolerance limits to ensure uniform board thickness.
Explains procedures for submerging specimens in water under controlled temperatures and durations depending on board grade. Includes post-immersion peel tests to verify bonding integrity and resistance to water-induced damage.
Describes test setup involving fungal-inoculated sawdust, specimen preparation, and exposure conditions. Details the soak test and evaluation for any edge separation, ensuring the board's durability against fungal attack.
Frequently Asked
IS 4834 classifies veneered wood boards into two main grades: Grade 1, intended for storage packaging requiring enhanced durability, and Grade 2, designed for transit packaging suited for temporary use. Face veneers must be selected from timber species classified as Class I or Class II according to IS 303-1960 to ensure suitable quality.
The standard permits various timber species for face veneers but prefers those listed as Class I or Class II in IS 303:1960 for quality assurance. Core materials should be uniform species per board, properly seasoned to a moisture content of 12% or less, with minimum widths of 80 mm and lengths matching the board. Typical nominal thicknesses for boards range from 9 to 19 mm with specified veneer and core layer thicknesses.
The dimensional tolerances specified include a permissible variation of ±6 mm in length, ±3 mm in width, and ±0.5 mm in thickness of the veneered wood boards. These tolerances ensure proper fit and consistency, with additional allowances for edge straightness and squareness as per the standard.
Adhesion between plies is assessed by soaking test specimens in water—Grade 1 boards are heated at 70 ± 2°C for three hours followed by immediate cold water immersion, while Grade 2 boards are soaked in cold water for 24 hours. After soaking, while still wet, outer layers are forcibly separated using a prising knife to check resistance and the presence of adherent fibers on the fractured surfaces, ensuring bonding integrity.
Water resistance is assessed by immersing specimens in water under specified conditions—Grade 1 boards undergo a hot water treatment at 70 ± 2°C for three hours, followed by cold water immersion, while Grade 2 boards are soaked in cold water for 24 hours. Both grades then undergo peel tests to check bonding. Fungal durability is evaluated by exposing specimens to fungal spores in a moistened sawdust environment, followed by a soak test and inspection for edge separation, ensuring resistance against fungal degradation.
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