Lesson Notes By Weeks and Term v3 - Senior Secondary 2
Platform Materials
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Platform Materials
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Subject: Upholstery
Class: Senior Secondary 2
Term: 1st Term
Week: 6
Theme: Upholstery Materials
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where less flexibility is desired.
Characteristics: Strong, rot-resistant, less expensive than elastic webbing. Provides firm support, less comfortable than elastic webbing for seating.
Applications: Outdoor furniture, backrests where a firm support is needed, or very budget-conscious seating.
3. Spring Systems: Offer superior comfort and durability, especially for seating.
Coil Springs (Open Coil Springs): Description: Individual helical springs, tied together manually with twine in a precise pattern to create a resilient platform.
Characteristics: Offers deep, luxurious comfort and excellent durability. Labour-intensive to install.
Applications: High-end, traditional sofas and armchairs.
Nigerian Context: Found in more luxurious or antique furniture pieces due to the skill and material cost involved.
Zig-zag Springs (No-sag Springs): Description: S-shaped wire springs attached in a continuous line across the frame, typically with clips and often joined by connecting wires.
Characteristics: Easier to install than coil springs, provides good support and comfort, less bulky. Can be noisy if not properly installed and isolated.
Applications: Modern sofas, chairs, and benches. A popular choice for a balance of comfort, durability, and cost-effectiveness.
Nigerian Context: Very common in modern Nigerian furniture due to its efficiency and good performance.
Pocket Springs (Marshall Units): Description: Individual small coil springs encased in fabric pockets, glued together to form a unit.
Characteristics: Excellent independent support, minimises motion transfer. Primarily used within cushions, but can form a solid spring unit for a platform.
Applications: High-quality mattress bases, some very high-end seating platforms for ultimate comfort.
Nigerian Context: Less common as a primary platform material for typical furniture, more for mattresses.
Factors for Selecting Platform Materials:
1. Project Type: Sofa, chair, ottoman, bed base, indoor, outdoor.
2. Desired Comfort Level: Firm (jute, solid panel) vs. Soft/Resilient (elastic webbing, springs).
3. Durability Requirements: High-traffic areas (springs, plywood) vs. occasional use (elastic webbing, MDF).
4. Budget: Cost of materials and labour. (Particle board < MDF < Plywood < Webbing < Zig-zag springs < Coil springs).
5. Design Aesthetic: Traditional vs. Modern.
6. Client Needs: Specific preferences for firmness, support, or longevity.
Worked Example (Nigerian Context): Scenario: A client in Abuja wants two pieces of furniture:
1. A durable and comfortable sofa for a busy hotel lobby that will see constant use.
2. A lightweight, affordable bench for a small hair salon waiting area.
Task: Recommend appropriate platform materials for each, justifying the choice.
Solution:
1. Hotel Lobby Sofa: Recommended Platform Materials: Sturdy hardwood frame with Zig-zag springs for the seat, and elastic webbing for the backrest. A base of 18mm marine plywood could be used as a sub-platform if an extra firm foundation is required, especially if the sofa is modular.
Justification: Durability: Hardwood frame and zig-zag springs provide exceptional durability to withstand heavy and continuous use in a hotel lobby. Zig-zag springs offer reliable support without sagging quickly.
Comfort: Zig-zag springs combined with high-density foam cushions offer good comfort for guests. Elastic webbing in the back provides a supportive yet slightly yielding backrest.
Maintenance: These materials are robust and will require less frequent repair, which is critical for a commercial setting. Marine plywood adds moisture resistance, good in areas with frequent cleaning.
Aesthetic/Modernity: Zig-zag springs are commonly used in modern, durable furniture, aligning with a contemporary hotel setting.
2. Hair Salon Waiting Bench: Recommended Platform Materials: Lightweight wooden frame (e.g., from iroko or mahogany offcuts) with a seat base made from 9mm or 12mm plywood, topped with medium-density foam. Alternatively, a frame with polypropylene webbing (if a slightly softer feel is desired than a solid board).
Justification: Affordability: Plywood is more cost-effective than springs. Using local wood offcuts for the frame also reduces cost. Polypropylene webbing is also an economical choice.
Lightweight: Plywood or webbing provides a lighter structure, easy to move for cleaning or re-arrangement in a salon.
Practicality: While it doesn't need the same level of comfort as a hotel sofa, the plywood/webbing base provides adequate support for short waiting periods. * Local Sourcing: Plywood is readily available from timber markets across Nigeria, making it easy to source for small businesses. board).
Justification: Affordability: Plywood is more cost-effective than springs. Using local wood offcuts for the frame also reduces cost. Polypropylene webbing is also an economical choice.
Lightweight: Plywood or webbing provides a lighter structure, easy to move for cleaning or re-arrangement in a salon.
Practicality: While it doesn't need the same level of comfort as a hotel sofa, the plywood/webbing base provides adequate support for short waiting periods. * Local Sourcing: Plywood is readily available from timber markets across Nigeria, making it easy to source for small businesses. --- The "platform" in upholstered furniture refers to the underlying structure that supports the seat cushions, back cushions, and often the arms. It is the foundation upon which the upholstery work is built, providing the necessary support and shape. A well-constructed platform is vital for the longevity, comfort, and aesthetic appeal of the furniture piece.
Key Functions of a Furniture Platform:
1. Support: Bears the weight of the user and cushions.
2. Shape Retention: Helps maintain the overall form and design of the furniture.
3. Durability: Contributes to the furniture's lifespan, preventing sagging or structural failure.
4. Comfort: Influences the feel and resilience of the seating. Common Platform Materials and Their Characteristics:
1. Wood-based Panels: These provide a rigid, solid base.
Plywood: Description: Made from thin layers (plies) of wood veneer glued together with alternating grain directions.
Characteristics: Very strong, stable, resistant to warping, good screw retention. Available in various thicknesses (e.g., 6mm, 9mm, 12mm, 18mm). Marine plywood is moisture-resistant.
Applications: Chair seats, sofa frames, back panels, armrests. Ideal for high-stress areas or where a firm, non-flexible base is required.
Nigerian Context: Widely available, often used in locally fabricated furniture for its strength and durability.
Medium Density Fibreboard (MDF): Description: Engineered wood product made from wood fibres defibrated, waxed, and resin-bonded under high temperature and pressure.
Characteristics: Smooth surface, very dense, takes paint well, no grain.
However, it is heavier than plywood, less resistant to moisture unless treated, and screw retention is poorer on edges.
Applications: Back panels, internal structural components not subject to direct stress, decorative panels. Can be used for seat bases if adequately supported and not exposed to moisture.
Nigerian Context: Often used for more aesthetic or less structural parts due to its smooth finish and lower cost than plywood in some applications.
Particle Board (Chipboard): Description: Made from wood particles (chips) glued and pressed together.
Characteristics: Cheapest wood-based panel, less dense and weaker than plywood or MD
F. Poor moisture resistance and screw retention.
Applications: Seldom used for primary platforms in quality upholstery due to poor durability. May be used for dust covers beneath furniture, or non-load-bearing back panels in very low-cost items.
Nigerian Context: Used in very budget-friendly furniture, but not recommended for durable platform construction.
Hardboard (Masonite): Description: High-density fibreboard, very thin and hard.
Characteristics: Very smooth on one side, textured on the other (tempered hardboard is smoother and stronger). Not structural.
Applications: Backing boards for dressers, dust covers underneath chairs, drawer bottoms.
Nigerian Context: Common for non-structural covering and finishing.
2. Webbing Systems: Provide resilient suspension.
Jute Webbing: Description: Natural fibre webbing, traditionally used. Comes in various widths (e.g., 2-3 inches) and weights (e.g., 8lb, 10lb).
Characteristics: Strong, durable, provides firm support, minimal stretch. Requires webbing stretchers for proper tensioning.
Applications: Traditional upholstery, often combined with coil springs. Used for seat and back suspensions.
Nigerian Context: Still used in traditional furniture workshops due to its availability and familiar application.
Elastic Webbing (Pirelli Webbing): Description: Synthetic webbing, typically rubberised, with significant stretch.
Characteristics: Provides a softer, more flexible support than jute. Easier to install than springs, offers good comfort. Comes in different strengths/elasticity levels.
Applications: Modern upholstery for seats and backs, offering comfortable suspension. Often used in combination with foam cushions.
Nigerian Context: Gaining popularity in contemporary Nigerian furniture designs due to ease of use and comfort.
Polypropylene Webbing (Non-elastic): Description: Synthetic, non-elastic webbing, often used for outdoor furniture or as a cheaper alternative where less flexibility is desired.
Characteristics: Strong, rot-resistant, less expensive than elastic webbing. Provides firm support, less comfortable than elastic webbing for seating.
Applications: Outdoor furniture, backrests where a firm support is needed, or very budget-conscious seating.
3. Spring Systems: Offer superior comfort and durability, especially for seating.
Coil Springs (Open Coil Springs): Description: Individual helical springs, tied together manually with twine in a precise pattern to create a resilient platform.
Characteristics: Offers deep, luxurious comfort and excellent durability. Labour-intensive to install.
Applications: High-end, traditional sofas Teacher Activities: Introduction & Brainstorming (10 mins): Initiate a discussion by asking students what they think supports the cushions in a sofa or chair. Show images or actual samples of various furniture bases and ask students to identify what they see. Clarify the definition of a "platform" in upholstery. Material Presentation & Explanation (20 mins): Present physical samples of each platform material (plywood, MDF, hardboard, jute webbing, elastic webbing, zig-zag spring, coil spring if available). If physical samples are not available, use large, clear images or videos. For each material, explain its characteristics, advantages, disadvantages, and typical applications using the content from Section
2. Demonstrate proper handling/measurement of wood panels and simple techniques like marking for cuts or attaching webbing to a sample frame. Emphasize safety precautions when handling wood, cutting tools, and springs.
Comparative Analysis (15 mins): Lead a discussion comparing and contrasting different materials (e.g., plywood vs. MDF for rigidity; jute webbing vs. elastic webbing for comfort; zig-zag vs. coil springs for durability/cost). Use the "Factors for Selecting Platform Materials" (Section 2) as a guide for discussion.
Practical Demonstration (15 mins): Demonstrate a simple task related to platform construction, e.g., Measuring and marking a piece of plywood for a seat base. Attaching a piece of elastic webbing to a small frame using staples/clips. Briefly show how zig-zag springs are clipped onto a frame (without full installation). Emphasize safety protocols during demonstrations (e.g., proper use of staple gun, handling wood).
Q&A and Clarification (5 mins): Address any student questions or misconceptions.
Student Activities: Observation and Note-Taking (Throughout lesson): Students will observe the material samples/images and teacher demonstrations. Students will take detailed notes on the characteristics, uses, advantages, and disadvantages of each platform material.
Material Identification (15 mins): Working in small groups (2-3 students), students will be given unlabeled samples or images of different platform materials. They will identify each material and list one characteristic and one typical application. Scenario-Based Material Selection (10 mins): Groups will be given a simple furniture project scenario (e.g., "Build a study chair for a secondary school student," "Repair a local 'mai shayi' bench"). They will discuss and select the most appropriate platform material(s) for their scenario, justifying their choices based on cost, comfort, and durability.
Sketching (10 mins): Students will sketch a simple chair frame and indicate where different platform materials (e.g., plywood for seat, webbing for back) would be used. Group Presentation (5 mins, optional depending on time): Selected groups briefly present their material selection scenario and justifications. ---
Furniture Manufacturing and Repair (Entrepreneurship): Knowledge of platform materials is fundamental for students aiming to start or work in furniture workshops across Nigeria.
They can: Build new furniture: Select appropriate and cost-effective materials for different types of furniture (e.g., local 'bamboo' chairs, modern sofas, office chairs) to meet client specifications and budget.
Repair existing furniture: Accurately diagnose platform issues (e.g., sagging webbing, broken springs, warped plywood) and select the correct replacement materials, extending the life of furniture and offering a valuable service in local communities. This directly supports the informal economy and youth employment. Interior Design and Home Furnishing (Consumer Awareness): For individuals furnishing their homes or advising others, understanding platform materials helps in making informed purchasing decisions.
Quality Assessment: Consumers can differentiate between high-quality, durable furniture (e.g., with spring systems or good quality plywood) and cheaper alternatives (e.g., particle board).
Customization: When ordering custom furniture from local artisans, they can specify preferred platform materials to ensure desired comfort and longevity, promoting better client-artisan communication.
Environmental and Resource Management: The choice of platform materials can have environmental implications.
Sustainable Sourcing: Students can learn to identify and source sustainably managed wood panels (e.g., certified plywood) or consider the lifespan of materials to reduce waste.
Local Material Use: Prioritizing locally available materials like various types of wood (e.g., Iroko, Mahogany) for frames, or considering recycled/upcycled options, contributes to reducing transportation costs and supports local industries. ---