Grading rules for unsplit canes

IS 15456: Scope Overview

• Scope Definition: IS 15456 primarily deals with specifications related to timber technology and utilization, referencing definitions from IS 707 (Glossary of Timber Terms) and IS 15458.

• Rounding Off Values:

  • Follow IS 2:1960 for rounding numerical values.
  • The number of significant figures in the rounded value must match those in the specified standard value.

• Referenced Standards:

  • IS 707:1976 — Glossary of timber terms.
  • IS 15458 — Additional definitions related to timber.

Key Points:

No direct formulas or tables are provided under "Scope" in IS 15456; it sets the framework for applying definitions and rounding rules.

flowchart LR
    A[IS 15456 Scope] --> B[Use IS 707 & IS 15458 Definitions]
    A --> C[Rounding as per IS 2:1960]
    A --> D[Timber Technology & Utilization]

IS 15456 References - Key Points

• The standard references other IS codes as integral parts:

  • IS 2:1960 — Rules for rounding off numerical values.
  • IS 707:1976 — Glossary of terms for timber technology.
  • IS 15458 — Definitions relevant to this standard.

• Rounding Off Rule (IS 2:1960):
  Final test or analysis values must be rounded to the same number of significant digits as the specified standard value.

• Definitions:
  Use terms as defined in IS 707 and IS 15458 for consistent interpretation.

Summary Table of Referenced Standards

This ensures uniformity and clarity in application and interpretation of IS 15456 provisions.

IS 15456: Definitions Summary

• Definitions Source:
  IS 15456 refers to definitions given in:

  • IS 707: 1976 – Glossary of terms for timber technology and utilization
  • IS 15458 – Related timber standards

• Rounding Off Values:
  Follow IS 2: 1960 rules for rounding numerical results:

  • Final values (test or analysis) must be rounded to the same number of significant figures as the specified values in the standard.

• Referenced Standards:
  IS 15456 incorporates provisions from other standards valid at publication; users should check for latest editions.

Key Points from IS 707 (Timber Terms):

Rounding Example (IS 2:1960)

flowchart LR
    A[IS 15456 Definitions] --> B[IS 707: Timber Terms]
    A --> C[IS 15458: Timber Standards]
    A --> D[IS 2: Rounding Rules]

Summary: IS 15456 relies on IS 707 & IS 15458 for timber definitions and IS 2 for numerical rounding rules.

IS 15456 - General Requirements Summary

• Reference Standards:
  Compliance with IS 15456 requires adherence to related standards, notably:

  • IS 2:1960 – Rules for rounding off numerical values.
  • IS 707 and IS 15458 – Definitions relevant to this standard.

• Rounding Off Values:
  Final test or calculation results must be rounded as per IS 2:1960, maintaining the same number of significant digits as the specified values.

• Application:
  Always verify you are using the latest editions of referenced standards for compliance.

Key Point on Rounding (IS 2:1960)

This clause sets the foundation for consistent interpretation and application of the standard, ensuring accuracy and uniformity in tests and calculations.

IS 15456 (2004) – Classification and Grading of Canes (Unsplit)

Key Specifications (Clause 5.1 - Small Diameter Canes)

• Length (L):

  • As specified by buyer
  • Measured as shortest distance between cane ends (in meters)
  • Rounded down to nearest 0.05 m

• Diameter (D):

  • Must be below 18 mm
  • Measured at mid-internode of the small end
  • Diameter classes for trading:
    • 2 – 6 mm

    • 6 – 11 mm

    • 11 – 17 mm

Summary Table for Diameter Classes

Notes:

• Length rounding ensures uniform grading.
• Diameter measurement at mid-internode avoids node swelling effects.

flowchart LR
    A[Buyer specifies length] --> B[Measure length (m)]
    B --> C[Round down to nearest 0.05 m]
    D[Measure diameter at mid-internode] --> E{Diameter class}
    E -->|2-6 mm| F[Thin canes]
    E -->|>6-11 mm| G[Medium canes]
    E -->|>11-17 mm| H[Thick canes]

This classification ensures uniformity in trading and quality control of unsplit canes.

IS 15456: Measurement of Cane Dimensions

1. Length Measurement (Both Small & Large Diameter Canes)

• Length = shortest distance from one extreme end to the other (in meters).
• Round off length down to nearest 0.05 m.

2. Diameter Measurement

• Diameter is measured at the mid-internode of the small end of the cane.

Small Diameter Canes (Diameter < 18 mm)

• Diameter classes for trading:
  • 2 - 6 mm

  • 6 - 11 mm

  • 11 - 17 mm

Large Diameter Canes (Diameter ≥ 18 mm)

• Minimum diameter: 18 mm
• Diameter tolerance: ±3 mm (for scraping)
• Diameter classes for trading:

  • 40 mm

  • 35 - 40 mm
  • 30 - 35 mm
  • 25 - 30 mm
  • 20 - 25 mm
  • 18 - 20 mm

Summary Table

flowchart TD
    A[Start: Cane] --> B[Measure Length]
    B --> C{Round length down to nearest 0.05 m}
    C --> D[Measure Diameter at mid-internode of small end]
    D --> E{Diameter < 18 mm?}
    E -- Yes --> F[Classify in 2-6, >6-11, >11-17 mm]
    E -- No --> G[Classify in >40, 35-40, 30-35, 25-30, 20-25, 18-20 mm]

This ensures uniformity

IS 15456: Permissible and Prohibited Defects

Prohibited Defects (Clause 5.3.1)

• Decay
• Worm holes
• Breakage
• Shakes

These defects are not permitted in timber or wood products under this standard.

Permissible Defects

• IS 15456 refers to IS 707 and IS 15458 for detailed definitions and specifications of permissible defects.
• Typically, minor surface checks, slight warping, or small knots may be allowed depending on the grade and end-use, but must comply with referenced standards.

Additional Notes

• Final test or analysis results must be rounded off per IS 2:1960 to maintain consistency.
• For detailed defect limits, consult IS 707 (for seasoning defects) and IS 15458 (for structural timber grading).

Summary Table (Indicative)

flowchart LR
    A[Timber Inspection] --> B{Defect Type}
    B -->|Decay, Worm Holes, Breakage, Shakes| C[Reject - Prohibited]
    B -->|Knots, Surface Checks| D[Check IS 707 & IS 15458]
    D --> E{Within Limits?}
    E -->|Yes| F[Accept]
    E -->|No| C

For precise grading and defect limits, always refer to IS 707 and IS 15458.

IS 15456 does not explicitly detail Inspection Procedures in the provided clauses. However, based on general IS code practices and IS 2:1960 for rounding off, here are key points and guidelines:

Inspection Procedure Key Points

• Rounding Off Results:
  Final test or analysis values must be rounded as per IS 2:1960 rules.

  • Retain the same number of significant figures as the specified value in IS 15456.
  • Example: If specified value = 12.3 (3 significant digits), round test result to 3 significant digits.

• Reference Standards:
  Use definitions and procedures from:

  • IS 707 (Steel Bars and Wires for Concrete Reinforcement)
  • IS 15458 (General definitions related to steel reinforcement)

• General Requirements (Clause 4):
  Follow general quality and inspection norms as per IS 15456 and referenced standards.

Typical Inspection Checklist for IS 15456 Compliance

flowchart TD
    A[Sampling] --> B[Visual Inspection]
    B --> C[Dimensional Checks]
    C --> D[Mechanical Testing]
    D --> E[Rounding Off Results (IS 2:1960)]
    E --> F[Documentation & Compliance]

For detailed formulas or tables, refer to IS 707 and IS 15458 as IS 15456 defers to these for definitions and detailed procedures.

IS 15456: Packaging and Labelling Key Points

Packaging & Labelling (Clause 9)

• Sorting & Bundling: Canes are sorted and bundled by diameter/length grade and trade name.
• Labelling Requirements: Each bundle must be legibly marked with:
  • Trade-name / Vernacular name
  • Botanical name
  • Diameter / Length
  • Origin or Source
  • Number of canes per bundle
  • Name and address of supplier
  • Date of supply

Inspection (Clause 8)

• Minimum 10% of lot inspected randomly for size and uniformity.
• Small-diameter canes treated with anti-staining fungicides.
• Large-diameter canes single-scraped and chemically treated.

Permissible Defects (Clause 5.3.2)

Rounding Off (General)

• Final test values rounded per IS 2:1960, maintaining significant digits as specified.

flowchart TD
    A[Sorting & Bundling] --> B[Labelling]
    B --> C{Label Info}
    C --> D[Trade-name]
    C --> E[Botanical name]
    C --> F[Diameter/Length]
    C --> G[Origin/Source]
    C --> H[No. of Canes]
    C --> I[Supplier Details]
    C --> J[Date of Supply]

This ensures traceability and quality control as per IS 15456 requirements.

IS 15456: Compliance and Quality Assurance Summary

1. Rounding Off (IS 2:1960)

• Final test or analysis results must be rounded to the same significant figures as specified.
• Ensures uniformity in reporting compliance.

2. Permissible Defects (Clause 5.3.2)

3. Inspection Procedure (Clause 8)

• Inspect unsplit canes individually.
• Chemically treat small-diameter canes with anti-staining fungicides.
• Inspect minimum 10% of lot randomly for size and uniformity.
• Large-diameter canes: single-scraped and fungicide treated.

4. Packaging & Labelling (Clause 9)

Each bundle must be labelled with:

• Trade name/vernacular name
• Botanical name
• Diameter/length
• Origin/source
• Number of canes per bundle
• Supplier name & address
• Date of supply

Visual Summary: Permissible Defects Grading

graph TD
    A