Lesson Notes By Weeks and Term v3 - Senior Secondary 1
Stencil Preparation
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Stencil Preparation
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Subject: Printing Craft Practice
Class: Senior Secondary 1
Term: 2nd Term
Week: 3
Theme: Screen Printing Reproduction
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Produce hand made stencil with cardboards. Produce a stencil using the block out method.
2. 1. Definition of Stencil A stencil is a template used to reproduce a design, pattern, or lettering by applying ink or paint through cut-out areas onto a surface. It acts as a mask, allowing ink to pass only through the desired parts, thereby creating the image. Stencils are fundamental for achieving consistency and speed in repetitive printing tasks. 2.
2. Purpose of Stencils in Printing Reproduction: Allows for the consistent replication of designs, logos, and text multiple times.
Efficiency: Speeds up the printing process compared to hand-drawing each item.
Uniformity: Ensures that each printed item is identical, maintaining brand consistency or design integrity.
Versatility: Can be used on various surfaces (textile, paper, wood, metal, walls) and with different types of inks or paints. 2.
3. Types of Stencils (Relevant to this lesson) While there are various types, this lesson focuses on two primary methods suitable for SSS1: Hand-Cut Stencils: Created by manually cutting out designs from a rigid material like cardboard, paper, or plastic.
Block-Out Stencils (for Screen Printing): Involves applying a resist material (blocking fluid, tape, or paper) directly onto a screen mesh to block off non-printing areas, allowing ink to pass only through the open mesh areas. 2.
4. Materials and Tools for Stencil Preparation Cardboard: For hand-cut stencils (e.g., cereal boxes, thick art paper, bristol board).
Craft Knife/Razor Blade/Utility Knife: For precision cutting. (Emphasis on safety).
Cutting Mat: Protects work surface and knife blade. Alternatively, thick cardboard or old newspaper layers.
Drawing Pencil: For sketching designs.
Ruler: For straight lines and accurate measurements.
Eraser: To correct drawing errors.
Masking Tape/Adhesive Tape: To secure stencil material or to block out areas.
Screen Printing Frame (with mesh): Essential for the block-out method in screen printing.
Blocking Fluid/Screen Filler: A liquid resist material used to block the mesh of a screen. (Water-based is ideal for schools).
Squeegee: Used for applying blocking fluid evenly onto the screen. (Alternatively, a piece of cardboard can be used).
Gloves: For protection when handling blocking fluids.
Hair Dryer (Optional): To speed up drying of blocking fluid. 2.
5. Method 1: Producing Hand-Made Stencil with Cardboards This method is ideal for simple designs, lettering, and small-scale projects.
Step-by-Step Procedure:
1. Design Selection and Preparation: Choose a suitable design. Simple, bold designs with clear outlines work best. Avoid intricate details or "islands" (parts that would fall out, e.g., the center of "O" or "A," without 'bridges'). If islands are necessary, design small connecting bridges. Draw the design clearly onto the cardboard using a pencil. Ensure outlines are sharp and precise. Alternatively, print a design and trace it onto the cardboard.
2. Securing the Workpiece: Place the cardboard containing the design on a cutting mat (or thick stack of newspapers/cardboard). Secure the cardboard with masking tape to prevent it from shifting during cutting.
3. Cutting the Design: Safety First: Always use a sharp craft knife or razor blade with extreme caution. Cut away from the body. Keep fingers away from the blade's path. Use a ruler for straight lines. Begin cutting along the drawn outlines. Apply steady, even pressure. It is better to make several light passes than one heavy, uncontrolled cut. Cut out all the areas that are intended to print (the "open" parts of the stencil). For intricate curves, rotate the cardboard rather than forcing the knife. Carefully remove the cut-out pieces, ensuring clean edges.
4. Finishing the Stencil: Inspect the stencil for any rough edges or incomplete cuts. Trim as necessary. If any bridges were incorporated to hold "islands," ensure they are well-defined. The cardboard template with the cut-out design is now the hand-made stencil.
Example: Creating a stencil for the word "NIGERIA" Draw "NIGERIA" in bold block letters on cardboard. Carefully cut out the inner parts of the letters (e.g., the negative space within 'N', 'I', 'G', 'E', 'R', 'A'). For letters like 'O' or 'A', ensure to leave small 'bridges' to hold the inner part (counter) in place, preventing it from falling out. For SSS1, simple designs If any bridges were incorporated to hold "islands," ensure they are well-defined. The cardboard template with the cut-out design is now the hand-made stencil.
Example: Creating a stencil for the word "NIGERIA" Draw "NIGERIA" in bold block letters on cardboard. Carefully cut out the inner parts of the letters (e.g., the negative space within 'N', 'I', 'G', 'E', 'R', 'A'). For letters like 'O' or 'A', ensure to leave small 'bridges' to hold the inner part (counter) in place, preventing it from falling out. For SSS1, simple designs without counterforms (like block letters 'C', 'L', 'T') are ideal for initial practice without bridges. For letters like 'O', 'A', 'P', 'R', etc., explain the need for 'bridges' or choose a font style that naturally avoids islands. 2.
6. Method 2: Producing a Stencil Using the Block-Out Method This method is primarily used for screen printing, where a mesh screen is used as a support for the stencil. The "block-out" refers to applying a material that blocks the ink from passing through the mesh in unwanted areas. Step-by-Step Procedure (for Screen Printing Frame):
1. Screen Preparation: Ensure the screen printing frame (with mesh) is clean and degreased. Any grease or dirt can prevent blocking fluid from adhering properly.
2. Design Transfer: Place the design (printed or drawn on paper) underneath the screen. The design should be visible through the mesh. Secure the design paper to the frame with masking tape to prevent movement.
3. Applying Blocking Fluid (or Tape): Option A: Using Blocking Fluid: Pour a small amount of blocking fluid (also known as screen filler or screen block) along one edge of the design on the mesh. Using a squeegee or a piece of cardboard, spread the fluid evenly over all the areas of the mesh that are not intended to print. These are the areas that should be blocked. Ensure the fluid penetrates the mesh completely, coating both sides if possible, or apply from one side and ensure full coverage. Carefully remove any excess fluid. Allow the blocking fluid to dry completely. A hair dryer can speed up this process. Once dry, the blocked areas will be hard and impermeable to ink.
Option B: Using Masking Tape or Paper: For simpler designs or as an introduction, students can block out areas directly on the mesh using masking tape, sticky vinyl, or pre-cut paper shapes adhered to the screen. This is less durable but effective for demonstration. Cut tape or paper to cover the areas that should not print. Press firmly to ensure good adhesion, especially around the edges.
4. Finishing and Inspection: Once the blocking fluid is dry (or tape is firmly applied), remove the design paper from underneath the screen. Hold the screen up to a light source. All areas intended for printing should be clear and open, while all non-printing areas should be completely blocked. Touch up any pinholes or incomplete blocking with a small brush and blocking fluid. Allow to dry. The screen is now prepared with a stencil using the block-out method.
Example: Creating a stencil for a small logo on a T-shirt. Draw or print the logo (e.g., a simple crest, school badge outline) on paper. Place it under the screen. Carefully apply blocking fluid or masking tape to all the areas around the logo and inside any parts of the logo that should not print. The actual logo outline itself will be left open on the mesh for ink to pass through. 3.
1. Teacher Activities Introduction (5 minutes): Introduce the topic of "Stencil Preparation" by asking students about common objects or prints they see daily (e.g., signs, branded T-shirts, patterns on walls). Explain the concept of stencils as templates for reproduction. Briefly state the learning objectives for the lesson. Concept Explanation and Discussion (15 minutes): Define "stencil" and explain its purpose, emphasizing its relevance in printing crafts and local industries (e.g., sign writing, textile printing). Discuss the materials and tools required for both hand-cut and block-out methods, showing examples of each. Emphasize safety precautions, especially when handling cutting tools (craft knives, razor blades). Demonstration of Hand-Made Cardboard Stencil (20 minutes): Live Demonstration: On a prepared workbench, demonstrate the step-by-step process of creating a simple hand-made stencil using cardboard. Show how to transfer a design. Demonstrate safe and precise cutting techniques using a craft knife and cutting mat. Emphasize cutting away from the body, using a ruler for straight lines, and making multiple light passes. Explain how to handle 'islands' (e.g., the center of 'O' or 'A') by creating 'bridges' or selecting appropriate designs. Engage students with questions during the demonstration. Demonstration of Block-Out Method for Stencil (20 minutes): Live Demonstration: Using a small screen printing frame, demonstrate the block-out method. Show how to position the design under the screen. Demonstrate the application of blocking fluid (or masking tape for a simpler version) to block non-printing areas. Explain the drying process and the importance of thorough blocking. Highlight the visual inspection for complete blocking. Discuss the difference between the two stencil types and their respective applications.
Practical Work Guidance (Ongoing): Divide students into small groups for practical work. Provide materials (cardboard, pencils, rulers, craft knives, cutting mats). If possible, provide a screen printing frame with blocking fluid for group demonstration or limited practical. Circulate around the classroom, providing individual assistance, correcting techniques, and reinforcing safety.
Review and Conclusion (5 minutes): Summarize the key concepts and procedures for both stencil preparation methods. Address any remaining student questions. Assign independent practice and prepare for evaluation. 3.
2. Student Activities Active Listening and Note-Taking: Listen attentively to explanations and safety instructions. Take comprehensive notes on definitions, procedures, materials, and safety.
Observation and Q&A: Observe the teacher's demonstrations closely, paying attention to details of technique and safety. Ask clarifying questions during and after demonstrations.
Group/Individual Practical Work: Hand-Made Cardboard Stencil: Working individually or in pairs, select a simple design (e.g., a single letter, a geometric shape, a simple icon relevant to Nigerian culture like a Kola nut outline). Draw or transfer the design onto cardboard. Under strict teacher supervision, carefully cut out the design using a craft knife and cutting mat, following safety guidelines. Ensure clean cuts and proper handling of delicate parts. Block-Out Method Stencil (Demonstration/Limited Practical): Observe the teacher's demonstration keenly. If materials permit, in small groups, practice applying blocking fluid or masking tape to a small screen section or a provided mock-up, following instructions. Inspect the blocked area for completeness.
Discussion and Peer Feedback: Discuss challenges encountered during practical work with group members. Provide constructive feedback to peers on their stencil cutting/blocking techniques, under teacher guidance. The teacher should guide students through these questions, explaining the thought process and allowing for discussion before revealing solutions.
Question 1: Identify four essential tools required for producing a hand-made stencil with cardboard.
Solution: Cardboard: The primary material from which the stencil is cut.
Craft Knife/Razor Blade: For precision cutting of the design.
Cutting Mat: To protect the work surface and the blade.
Drawing Pencil: For sketching the design onto the cardboard before cutting.
Commentary: These tools are fundamental for the manual process of creating a stencil.
Question 2: Outline the main steps involved in producing a hand-made stencil using cardboard.
Solution: Design Preparation: Select or draw the desired design clearly onto the cardboard.
Securing the Workpiece: Place the cardboard on a cutting mat and secure it to prevent movement.
Cutting the Design: Carefully cut out the areas intended to print using a sharp craft knife, following all safety precautions.
Finishing: Remove cut-out pieces and trim any rough edges to ensure a clean stencil.
Commentary: This sequence ensures a systematic and safe approach to stencil creation.
Question 3: Describe the key procedure for preparing a stencil using the block-out method on a screen printing frame.
Solution: Screen Cleaning: Ensure the screen mesh is clean and free of grease.
Design Placement: Position the artwork underneath the screen, aligning it correctly.
Blocking Application: Apply blocking fluid (or masking tape) onto the mesh to cover all areas that are not intended to print. Ensure thorough coverage.
Drying & Inspection: Allow the blocking fluid to dry completely, then hold the screen to light to check for any unblocked pinholes, touching up as needed.
Commentary: This method creates a durable stencil on a screen, suitable for multiple prints.
Question 4: Why is it crucial to use a cutting mat when producing a hand-made cardboard stencil?
Solution: A cutting mat is crucial because: It protects the underlying work surface (e.g., desk, table) from being scratched or damaged by the craft knife. It preserves the sharpness of the knife blade by providing a soft, self-healing surface, extending the blade's life and ensuring clean cuts. It provides a stable, non-slip surface for the cardboard, reducing the risk of accidents during cutting.
Commentary: Safety and tool longevity are paramount in printing craft practice.
Question 5: Mention two common real-life applications of stencils in Nigeria.
Solution: Sign Writing: Stencils are extensively used by local sign writers to create consistent lettering and logos on shop fronts, directional signs, and vehicle branding across Nigerian communities.
Textile Printing: Stencils are employed in the production of customised T-shirts, Ankara fabrics, and souvenir bags, particularly by small and medium-sized enterprises (SMEs) and artisans.
Commentary: These applications demonstrate the economic and cultural relevance of stencil skills in Nigeria.
Local Signage and Branding: In many Nigerian towns and cities, small businesses (e.g., provision stores, hair salons, tailoring shops) use hand-painted signs. Stencil preparation skills enable students to create consistent lettering and logos, offering professional-looking signage services to these local businesses, enhancing their visibility and brand image. This contributes directly to the informal and formal economies. Customized Textile Products for Events and Souvenirs: Stencils are crucial for printing customized T-shirts, souvenir bags, or traditional fabric patterns. Students can use their block-out stencil skills to start small ventures producing branded merchandise for local events, political campaigns, religious gatherings, or tourist souvenirs (e.g., 'I Love Nigeria' T-shirts, custom designs for local festivals). This is a highly lucrative area in Nigeria's vibrant event culture.
Community Art and Awareness Campaigns: Stencils can be used for community murals, educational posters, or public awareness campaigns (e.g., handwashing, voter education, sanitation messages). Students can apply their skills to create reusable stencils for painting messages on public walls, banners, or school supplies, making a direct impact on their local community's health, education, and civic engagement.