wooden packing cases

IS 1503: Scope - Key Formulas, Tables, and Specifications

1. Classes of Packing Cases (Clause 4.1, Table 1)

2. Sizes of Packing Cases (Clause 4.3, Table 2)

• Internal dimensions are denoted by cross-section and length.
• Length limited to max 3× side or 200 cm, whichever is less.

3. Selection of Class, Style & Timber Group (Clause 5.1, Table 3)

IS 1503: Key Definitions, Classes, Sizes & Selection Criteria for Wooden Packing Cases

1. Definitions (Clause 2.0)

• Uses definitions from IS 6703-1972 (Glossary of wooden packaging terms).
• Applies to wooden packing cases for transport/storage.

2. Classes of Packing Cases (Clause 4.1, Table 1)

3. Sizes of Packing Cases (Clause 4.3, Table 2)

• Dimensions are internal and in cm.
• Cross-section sizes and lengths (max length = min(3×side, 200 cm)):

4. Selection of Class, Style & Timber Group (Clause 5.1, Table 3)

| Mass of Contents (kg) | Class | Style for Easy/Average Load | Style for Difficult Load | Timber Group

IS 1503 - Materials: Key Formulas, Tables & Specifications

1. Classes of Packing Cases (Clause 4.1, Table 1)

2. Internal Dimensions of Wooden Packing Cases (Clause 4.3, Table 2)

• Cross-sections (cm x cm):
  • 20×20, 30×30, 40×40, 60×60, 80×80, 90×90
• Length options (cm):
  • Varies by cross-section, e.g., 20×20: 20,30,40,50,60
  • Length max = min(3 × side, 200 cm)

3. Selection of Class, Style & Timber Group (Clause 5.1, Table 3)

Notes:

• Timber groups I to IV indicate strength and durability; I is strongest.
• Style numbers correspond to packing case design details (refer to

IS 1503: Classes, Styles, and Sizes of Wooden Packing Cases

1. Classes of Packing Cases (Clause 4.1, Table 1)

2. Sizes of Packing Cases (Clause 4.3, Table 2)

• Sizes are internal dimensions (Length × Cross Section).
• Cross sections (cm × cm): 20×20, 30×30, 40×40, 60×60, 80×80, 90×90.
• Length options (cm) vary with cross section, e.g., for 20×20: 20, 30, 40, 50, 60.
• Maximum length = minimum of (3 × side dimension, 200 cm).

3. Nail Specifications (Clause 3.2.1)

• Shank diameter ≥ 2.00 mm.
• Nail length ≥ sum of thicknesses of boards and battens + 6 mm.

4. Selection Guide (Clause 5.1, Table 3)

IS 1503: Selection of Correct Class, Style of Packing Case & Group of Timber

1. Classes of Packing Cases (Clause 4.1, Table 1)

2. Internal Dimensions of Packing Cases (Clause 4.3, Table 2)

• Cross-section sizes (cm x cm): 20×20, 30×30, 40×40, 60×60, 80×80, 90×90.
• Length options vary per cross-section, max length = min(3 × side, 200 cm).
• Tolerance on internal dimensions: ±5 mm (Clause 4.3.1).

3. Selection Based on Mass, Load Type & Timber Group (Clause 5.1, Table 3)

Notes:

• Class depends on board/batten thickness.
• Style varies with ease/difficulty of load handling.
• Group of Timber indicates timber strength/durability; Group I is highest.
• For loads >250

IS 1503: Construction Requirements for Packing Cases

1. Classes of Packing Cases (Clause 4.1, Table 1)

2. Selection Based on Mass & Load (Clause 5.1, Table 3)

3. Nail Specifications (Clause 3.2.1)

• Minimum shank diameter: 2.00 mm
• Length: ≥ (sum of thicknesses of boards + battens) + 6 mm

Summary

• Choose Class and Style based on content mass and load difficulty.
• Use Table 1 for board and batten thickness.
• Ensure nails meet minimum diameter and length for secure fastening.

flowchart TD
    A[Mass of Contents] --> B[Select Class (A, B, C)]
    B --> C[Select Style of Packing Case]
    C --> D[Choose Timber Group]
    D --> E[Apply Nail Specifications]

This ensures

IS 1503: Workmanship and Finish - Key Points

• Nailing Pattern (Clause 6.13):

  • Nails must be staggered so that ~60% are driven through sides, top, and bottom into end battens.
  • Remaining nails go into end boards.
  • For delicate materials, nails are driven from inside to outside and clinched over battens to avoid damage.

• Flush Surfaces (Clause 6.8 & 6.9.1):

  • Ends and sides of top and bottom shooks must be flush with outer surfaces of ends and sides (see Fig. 1).
  • Ends of vertical end battens must be flush with outer surfaces of top and bottom shooks (see Fig. 2A).

• Marking (Clause 10.2):

  • Standard marking details are specified by the Bureau of Indian Standards.

Summary Table: Nailing Distribution

Visual Concept (Flush Assembly):

graph LR
  A[Top Shook] --- B[Vertical End Batten]
  B --- C[Bottom Shook]
  style A fill:#f9f,stroke:#333,stroke-width:2px
  style B fill:#bbf,stroke:#333,stroke-width:2px
  style C fill:#f9f,stroke:#333,stroke-width:2px
  note right of B: Ends flush with top & bottom shooks

This ensures smooth, aligned surfaces and proper nail placement for structural integrity and protection of contents.

IS 1503 - Preservative Treatment & Related Specs

1. Preservative Treatment (Clause 8.1)

• Shooks (wooden components) shall receive preservative treatment as agreed.
• Treatment should conform to IS 401:1982 - Code of Practice for Preservation of Timber.
• Purpose: Protect against decay, insect attack, and extend service life.

2. Timber Quality (Clause 3.1.1)

• Moisture content ≤ 18%.
• Grain inclination ≤ 1:10.
• Free from:
  • Centre heart (pitch)
  • Decay, rot, insect attack
  • Objectionable knots, warping, splits
• Pin holes allowed only if scattered and not powder post beetles (none in export packing).

3. Nails (Clause 7.2)

• Nails must be well clinched along the grain for strength.

4. Packing Case Dimensions (Clause 4.3 & Table 2)

Summary Diagram: Treatment & Quality Flow

flowchart TD
    A[Timber Selection] --> B[Seasoning ≤18% Moisture]
    B --> C[Check Grain Inclination ≤1:10]
    C --> D[Inspect for Defects]
    D --> E{Defects?}
    E -- Yes -->

IS 1503: Delivery - Key Specifications & Table for Packing Cases

Key Factors for Delivery (Clause 5.1)

• Selection depends on:
  • Mass & nature of contents
  • Type of load (Easy, Average, Difficult)
  • Handling & transportation modes
  • Ultimate destination

Load Classifications (Clauses 2.1, 3.1, 4.1)

• Easy Load: Low/moderate density, fills case fully, contents support case faces (e.g., boxed articles, wooden cabinets).
• Average Load: Moderately dense, moderate protection, partial support to case faces (e.g., metal cans, cushioned bottles).
• Difficult Load: Highly concentrated, delicate or free-flowing items causing concentrated forces (e.g., bolts, delicate instruments, heavy wrenches).

Table 3: Mass of Contents, Class, Style of Packing Case & Timber Group

Summary:

• Use Class A for heavier loads (>100 kg), B for medium, and C for light loads (<50 kg).
• Style of packing case varies by load difficulty and mass.
• Timber group selection ensures durability and protection per load type.

flowchart TD
    A[Mass of Contents] --> B{Load Type}
    B -->|Easy/Average| C[Select Style & Timber (Easy/Average)]
    B -->|Difficult| D[Select Style &

IS 1503 - Marking, Classes, Styles & Sizes of Wooden Packing Cases

1. Marking (Clause 10.1 & 10.2)

Each case/bundle must be legibly and indelibly marked with:

• Manufacturer's name/initials/trade-mark
• Year of manufacture
• Class and Style symbol: C/S
  • C = Class (A, B, or C)
  • S = Style (1, 2(a), 2(b), 3(a), 3(b))

Example:
A/2(b) means Class A, Style 2(b).

2. Class, Style & Timber Group Selection (Clause 5.1, Table 3)

3. Sizes of Packing Cases (Clause 4.3, Table 2)

• Internal dimensions denoted by cross-section × length (cm).
• Length max = min(3 × side, 200 cm).