Plywood Tea Chests: Part-1 General

IS 10 Part 1: Scope & Key References

Scope:
IS 10 Part 1:1990 covers the general requirements and definitions for plywood tea-chests used primarily for packaging tea. It references detailed standards for materials, testing, assembly, and packing.

Key Specifications & References (Clause 2.1 & Annex A)

Testing Parameters (Clause 8.1.1)

Important Notes:

• Definitions per IS 707:1976 apply.
• Testing ensures durability and handling safety of plywood tea-chests.
• Refer to IS 10 Parts 2-5 for detailed material & assembly specs.
• Performance tests (IS 7028) validate packaging integrity under transport stresses.

flowchart LR
    A[IS 10 Part 1: Scope] --> B[Material Specs: IS 10 Part 2]
    A --> C[Assembly: IS 10 Part 5]
    A --> D[Metal Fittings: IS 10 Part 4]
    A --> E[Testing: IS 7028 Parts 4 & 6]
    A --> F[Definitions: IS 707]

For detailed design or testing formulas

Referenced Indian Standards in IS 10 Part 1 (Fifth Revision)

IS 10 Part 1 refers to several related Indian Standards essential for plywood tea-chests specification:

Key Notes:

• Testing methods for end compression and vertical impact drop tests are aligned with IS 7028 (Parts 4 & 6), based on ISO standards.
• Definitions follow IS 707: 1976.
• Rounding off test results per IS 2: 1960 rules.
• The standards ensure quality control, testing, and conformity for plywood tea-chests.

Summary Diagram: Standards Relationship

graph LR
A[IS 10 Part 1] --> B[IS 10 Part 2: Plywood]
A --> C[IS 10 Part 3: Battens]
A --> D[IS 10 Part 4: Metal fittings]
A --> E[IS 10 Part 5: Assembly & Packing]
A --> F[IS 707: Timber Glossary]
A --> G[IS 1060: Paper Tests]
A --> H[IS 4006: Packaging Tests]
A --> I[IS 7028: Transport Package Tests]

For detailed specifications, testing procedures

IS 10 Part 1: Definitions Summary

• Clause 3.1: Definitions are as per IS 707:1976 — Glossary of terms applicable to timber technology and utilization.
• Key referenced standards (Annex A) provide detailed definitions and test methods related to plywood tea-chests and packaging materials, e.g.,
  • IS 10 (Parts 2-5): Plywood tea-chests (plywood, battens, metal fittings, assembly)
  • IS 707:1976: Timber terminology glossary
  • IS 1060 (Parts 2,4): Sampling and testing paper/allied products
  • IS 7028 (Parts 4,6): Performance tests for transport packages

Important Dimensions (Clause 6.1)

Summary

• Use IS 707:1976 for all timber-related definitions.
• Tea-chest sizes are standardized as above (outside dimensions).
• Refer to the listed IS parts for detailed test methods and material specifications.

flowchart TD
    A[IS 10 Part 1] --> B[Definitions as per IS 707:1976]
    A --> C[Tea-chest Sizes (Clause 6.1)]
    A --> D[Referenced Standards (Annex A)]
    D --> E[IS 10 Parts 2-5 (Tea-chest materials)]
    D --> F[IS 1060 Parts 2,4 (Paper Testing)]
    D --> G[IS 7028 Parts 4,6 (Packaging Tests)]

For detailed formulas or test procedures, consult the specific referenced IS parts.

IS 10 Part 1: Key Material Specifications (Clause 12.3)

Additional Notes on Materials:

• Metal fittings must conform to IS 10 (Part 4): 1990.
• Water absorption test involves weighing before and after immersion in distilled water.
• Toxicity testing involves systemic administration and implantation in rabbits.
• Thermal stability ensures no property variation after prolonged high-temperature exposure.

Summary Table for Material Properties

| Property                | Value/Limit           | Test Standard           |
|------------------------|----------------------|------------------------|
| Tensile Strength       | ≥ 2060 N/m           | IS 1060 (Part 1): 1966 |
| Puncture Strength      | ≥ 1.42 N·m           | IS 4006 (Part 2): 1985 |
| Water Vapour Permeability | ≤ 5 g/m²/24h       | IS 1060 (Part 2): 1960 |
| Water Absorption       | ≤ 1% (24h at 27°C)   | Weight gain method     |
| Toxicity               | None observed        | Animal testing         |
| Thermal Stability      | No change at 130°C   | 6-week exposure test   |

This ensures materials used in plywood tea-chests meet durability, safety, and

Design of Tea-Chest as per IS 10 Part 1 (1990)

1. Construction (Clause 5.1)

• Tea-chest made from 6 plywood panels forming a shook.
• Assembled with 12 battens and accessories (see Table 1).
• Nails: Use slat nails for corners, top, and bottom (IS 723:1972).

2. Standard Sizes (Clause 6.1)

3. Key Specifications

• Dimensions refer to outside measurements.
• For instant tea packing, tea-chests must comply with Table 1 (accessories, battens, nail specs).
• Battens provide structural rigidity; plywood thickness and nail type critical for durability.

Assembly Concept (Fig. 1)

graph TD
A[Plywood Panel 1] --> F[Assembled Tea-Chest]
B[Plywood Panel 2] --> F
C[Plywood Panel 3] --> F
D[Plywood Panel 4] --> F
E[Plywood Panel 5] --> F
G[Plywood Panel 6] --> F
H[12 Battens] --> F
I[Slat Nails (IS 723)] --> F

This ensures a sturdy, standardized tea-chest suitable for packaging and transport.

IS 10 Part 1 - Tea-Chest Sizes & Specifications (Clause 6.1)

Standard Sizes (Outside dimensions in mm)

Permitted Export Sizes (Max 610 mm height)

• 490 × 490 × 610 mm
• 410 × 510 × 610 mm
• 410 × 410 × 610 mm

Accessories & Materials (Example for 400×500×600 mm chest)

• Batten covers: 4 pieces (550 mm), 4 pieces (480 mm × 100 mm), 4 pieces (380 mm × 100 mm)
• Linings: 2 sheets (630 mm × 495 mm) for sides, 2 sheets (630 mm × 395 mm) for top & bottom
• Slating nails: 216 pieces of 25 mm × 2 mm (distributed for corners, top & bottom)
• Max permissible empty chest mass: 9 kg

Notes:

• Instant tea chests exclude lining; use polyethylene inner liners.
• Other sizes allowed if agreed, not exceeding above maximum dimensions.

flowchart TD
    A[Tea-Chest Sizes] --> B[Standard Sizes]
    A --> C[Export Sizes]
    B --> D{Dimensions (L×W×H)}
    D -->|Example| E[400×500×600 mm]
    E --> F[Batten Covers, Linings, Nails]
    F --> G[Max Empty Mass: 9 kg]
    C --> H[490×490×610 mm]
    C --> I[410×510×610 mm]
    C --> J[410×410×610 mm]

This summary provides key size tables and accessory specifications per IS 10 Part 1 Clause 6.1.

IS 10 Part 1: Tare and Mass Requirements for Tea-Chests

Key Clauses:

• Clause 7.2.1: Tare mass tolerance ±10% of certificate value; must not exceed max mass in Table 1.
• Clause 7.1: Max permissible empty tea-chest mass per Table 1.
• Clause 7.2: Supplier must declare tare mass in dispatch documents.

Table 1: Maximum Permissible Mass of Empty Tea-Chest

Additional Specifications:

• Batten covers: Tissue paper pieces specified per size (e.g., 4 pieces 550 mm for 400×500×600).
• Linings: Number and size of sheets vary by size; instant tea chests exclude linings but require polyethylene liners.
• Slating nails: Quantity and distribution detailed per size (e.g., 216 pieces of 25 mm × 2 mm for 400×500×600).

Summary:

• Ensure tare mass is within ±10% of declared value.
• Do not exceed max permissible mass per Table 1.
• Follow accessories and fixing details as per size for compliance.

flowchart LR
    A[Tare Mass Declaration] --> B{Within ±10%?}
    B -- Yes --> C{Less than Max Mass?}
    B -- No --> D[Reject or Re-measure]
    C -- Yes --> E[Accept Tea-Chest]
    C -- No --> D

This ensures quality and uniformity in tea-chest packaging per IS 10 Part 1.

IS 10 Part 1: Type Approval Tests for Tea-Chests

1. Type Approval Drop Test (Clause 8.1.2)

• Test: Filled tea-chest dropped on each corner from 600 mm height, repeated 3 times per corner.
• Acceptance: No visible deterioration such as:
  • Bulging/depressions on sides
  • Wrinkling of metal bindings
  • Nail loosening/breaking
  • Ply delamination
  • Other failures
• Note: Heights for other sizes as agreed between supplier and purchaser.

2. Maximum Permissible Mass (Clause 7.2.1)

• Mass variation ±10% of tare certificate.
• Must not exceed values in Table 1 below.

3. Accessories & Specifications (Table 1 Summary)

IS 10 Part 1: Marking Specifications for Plywood Tea-Chests

• Standard Marking: As per Clause 9.1.1, each packaging case may be marked with the BIS Standard Mark, indicating conformity to IS 10 (Part 1).

• Certification Statement (Clause 8.1.2):

  • Tea-chests must conform to IS 10 (Part 4) for metal fittings.
  • Testing officer signs a certificate confirming compliance or detailing failures (appearance, nailing, delamination, crushing, etc.).

• Marking Details:

  • Include manufacturer's name, testing laboratory, and test results.
  • Markings assure compliance with BIS inspection, testing, and quality control.

• Failures to Note (from Table in Clause 8.1.2):

  • Bulging/depression of sides
  • Wrinkling of metal bindings
  • Nail loosening/breaking
  • Delamination of plywood
  • Crushing corners
  • Splitting/breaking battens

• Accessories & Nails (Table 1, Clause 6.1.2.1):

  • Nails: 25 mm × 2 mm wire nails, quantity varies by chest size (e.g., 216 pieces for 400×500×600 mm chest).
  • Batten covers and linings have specified sizes per chest dimension.

Summary Table: Nail Quantity & Sizes for Tea-Chests

Note: The use of the Standard Mark is governed by BIS Act 1986; it certifies product quality and compliance.

flowchart LR
    A[Manufacture Tea-Chest] -->

IS 10 Part 1: List of Referred Indian Standards

This part of IS 10 references related Indian Standards essential for plywood tea-chests specification and testing:

Important Notes:

• Testing methods for end compression and vertical impact drop tests follow IS 7028 Parts 4 & 6, aligned with ISO standards.
• Rounding of test results follows IS 2:1960.
• The standards ensure quality control, inspection, and conformity for plywood tea-chests.

Summary Diagram of Related Standards

graph LR
A[IS 10 Part 1: General] --> B[Part 2: Plywood]
A --> C[Part 3: Battens]
A --> D[Part 4: Metal fittings]
A --> E[Part 5: Assembly & packing]
A --> F[IS 707: Timber glossary]
A --> G[IS 723: Nails]
A --> H[IS 1060: Paper testing]
A --> I[IS 4006

Proforma of Report for Tests on Tea-Chests (IS 10 Part 1:1990, Annex B)

1. Identification

• Maker/Fabricator Name & Address

2. Materials

• Species employed for:
  • a) Plywood veneers
  • b) Other veneers

3. Dimensions

• Size of tea-chest: (e.g., 480 mm × 480 mm × 600 mm)
• Thickness of plywood (mm):
  • a) Nominal
  • b) Actual average

4. Plywood Details

• Number of veneers in plywood

5. Mass

• a) Actual average mass of empty tea-chest (kg)
• b) Quoted mass of empty tea-chest (kg)

6. Test Results

• End Compression Test:
  • Load at initial bulging and permanent side depression (kN)
  • Average load (minimum 50 kN for 480×480×600 mm size)
• Drop Test:
  • Height: 600 mm
  • Number of drops: 3 on each corner
  • Observations on visible deterioration (bulging, wrinkling, nail failure, delamination)

Key Test Conditions (Clause 8.1.1 & 8.1.2)

Typical Signs of Deterioration

• Bulging/depressions on sides
• Wrinkling of metal bindings
• Nail loosening/bending/breaking
• Ply delamination
• Other structural failures

flowchart TD
    A[Start: Tea-chest preparation] --> B[Fill with 50 kg dry sawdust]
    B --> C[Condition