Maya Ellison
Attaching velcro to stiff plastic can be challenging due to the smooth and rigid nature of the surface. One option is to use an adhesive such as glue or double-sided tape. When choosing an adhesive, consider the flexibility and strength required for your specific application. For example, superglue is strong but brittle, and may not be suitable for flexible plastics. Epoxy or silicone-based adhesives can provide a strong and flexible bond, but may require additional surface preparation, such as roughening the plastic with sandpaper, or cleaning with rubbing alcohol or acetone. Alternatively, mechanical fasteners such as hose clamps or rivets can be used to secure velcro to stiff plastic without the need for adhesives.
Characteristics of affixing velcro onto stiff plastic
| Characteristics | Values |
|---|---|
| Type of glue | Epoxy, Silicone-based adhesive, Cyanoacrylate, Super glue, Hot glue, Urethane-based adhesive, PVC pipe glue |
| Type of preparation | Clean the surface with alcohol, Scuffing, Drilling for rivets |
| Other methods | Sewing, Stapling, Hose clamps |
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What You'll Learn
Using glue
If you want to attach Velcro to stiff plastic, there are several types of glue that can be used. However, it's important to note that glues may not provide long-term durability, and other methods such as riveting or using industrial-strength Velcro with a strong adhesive backing may be more effective.
- Regular UHU glue: This is recommended over super glue, as super glue tends to harden fabric and may result in a solid piece of fabric instead of loop Velcro. Regular UHU glue has been found to work well for attaching Velcro to cloth.
- Hot glue: Using a hot glue gun to apply a very small amount of hot glue can work for attaching Velcro to plastic. This method can be carefully reversed without causing damage.
- Cyanoacrylate (super glue): A two-part system that involves "painting" an activator on the surface before gluing can work on all plastics, including polyethylene and polypropylene. However, super glue is brittle and may crack if the plastic can bend.
- Urethane-based adhesive: Adhesives such as PL200 or PL400 can be used to attach Velcro to PVC pipes.
- PVC pipe glue: If the Velcro has a plastic backing, PVC pipe glue may work well.
Additionally, it is recommended to prepare the plastic surface before applying glue. This can be done by cleaning the surface with rubbing alcohol or acetone, and roughing up the surface with coarse sandpaper to improve adhesion.
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Double-sided tape
To affix Velcro onto stiff plastic with double-sided tape, you must first ensure your work environment is free from dirt, dust, and debris. The ideal temperature for application is between 15º and 25º C, with a relative humidity of 40% to 60%. Lower humidity will result in a better bond with the surface.
Next, peel the backing off one strip of the double-sided tape. Line the tape up with the stiff plastic and push it down firmly so it stays in place. You can use a stiff-bristled brush to ensure the tape adheres well.
Then, take your Velcro strip and peel the protective sheet off the adhesive side. Line up the Velcro with the plastic and press it firmly into contact with the surface, smoothing the tape to avoid air bubbles. You may need to wait up to 72 hours for an optimal bond.
It is important to note that not all adhesives are suitable for all surfaces. Some surfaces, such as plastics with high concentrations of plasticizers, may not hold together with certain adhesives. Additionally, pointed corners on heavy-duty Velcro can cause the fastener to eventually peel, so nipping or rounding each corner can prevent this.
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Hose clamps
To attach velcro to stiff plastic using hose clamps, you will first need to ensure that the plastic is clean and dry. You can use a stiff brush to get rid of any dirt or debris. It is important to note that not all plastics are suitable for this method. For instance, superglue will crack off if the plastic can bend, and epoxy is brittle in thin layers. Therefore, it is recommended to test the adhesive type to ensure it is suitable for the specific type of plastic.
Once the plastic is prepared, you can attach the velcro by clamping one end of the hose clamp to the plastic and the other end to the velcro. Ensure that the velcro is securely attached to the hose clamp, as this will provide a strong and stable hold.
To tighten a hose clamp, you can use a pair of pliers. Regular pliers may be challenging to use, especially with smaller hoses, so it is recommended to use spring clamp pliers or flexible hose clamp pliers, which are specifically designed for this purpose.
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Sewing
Choose the Right Type of Velcro
Select a soft and flexible sew-on type of Velcro. Avoid any Velcro with adhesive backing, as the sticky substance can gum up your needle and make sewing difficult. Look for Velcro specifically designed for sewing, as it will be softer and more pliable, reducing bulk and adding comfort.
Prepare the Velcro and Plastic
Before you start sewing, cut the Velcro to the required length. If you are working with a wider strip of Velcro, consider trimming it down to a narrower strip to avoid odd bunching and stiff spots. Clip the hooks along the cut edge to create a flat area for sewing. If your plastic has sharp edges, you may want to round them to prevent discomfort.
Mark the Position
Use a disappearing fabric marker or tailor's chalk to mark an outline of the Velcro on the stiff plastic. This will help you keep the Velcro properly aligned as you sew.
You can sew the Velcro onto the stiff plastic by hand or using a sewing machine. If using a machine, adjust the settings to match the fabric and Velcro. Use a sturdy needle, such as a topstitch needle size 14, and a strong thread like nylon or polyester.
When sewing, start in the middle of the widest part of the Velcro and work outwards. Use a zig-zag stitch, with one side of the stitch on the Velcro and the other on the plastic. Keep the seam allowance as close to the edge as possible, around 2 mm. Sew slowly and carefully to ensure the stitches are secure.
Additional Tips
If you are concerned about the strength of the Velcro, you can sew an 'x' through the centre of the Velcro strip to provide extra security. Additionally, always close the Velcro fasteners before washing or drying any projects to maintain their performance and longevity.
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Cleaning the surface
When preparing to affix Velcro onto stiff plastic, it is important to clean and dry the surface thoroughly. This is a crucial step to ensure a secure bond between the adhesive and the plastic surface. Here are some detailed instructions for cleaning the surface:
Firstly, select an appropriate cleaner. It is recommended to use a cleaner that will not leave any residue, film, or oily substance on the surface. Alcohol prep pads are a good option, and they can effectively clean the surface without leaving any unwanted residue. You can also use a citrus-based cleaner, which is particularly useful for removing any existing adhesive residue. Always remember to spot test any cleaner in a small area first and follow the instructions on the product carefully.
Next, wipe down the plastic surface thoroughly. You can use a tear-free, light-colored paper towel and wipe the surface in a single direction. Alternatively, you can use a wet cloth to wipe the surface and then dry it off with a separate cloth. Keep wiping until both the surface and the cloth are completely free of dirt and debris. This step ensures that there is no remaining dust or grime that could interfere with the adhesion process.
Additionally, it is important to maintain a suitable environment during the cleaning and adhesion process. The ideal room temperature should be moderate, ranging from 15°C to 25°C (59°F to 77°F), with a relative humidity between 40% and 60%. Lower humidity is preferable as it promotes a better bond with the surface. Proper ventilation is also recommended to ensure the area is free from excess moisture.
By following these steps, you will effectively clean and prepare the stiff plastic surface for the Velcro adhesion process, maximizing the chances of a strong and secure bond.
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Frequently asked questions
Silicone-based adhesives, such as goop products, are recommended for repairing plastic. Polyurethane-based adhesives such as PL200 or PL400, or PVC pipe glue can also be used. Super glue is not recommended as it tends to crack off if the plastic can bend.
Hose clamps can be used to attach velcro to stiff plastic. You can also use hot glue from a hot glue gun, or super sticky double-sided tape.
Clean the surface with denatured alcohol or acetone, and wait at least 24 hours before placing the velcro.
