Omar Khalid
There are several ways to attach plastic sheets to metal, and the best method depends on the specific application and materials involved. One common method for attaching plastic to a metal-framed greenhouse is to use a lock channel and spring wire, also known as wiggle wire. This method involves pulling the plastic tight and wiggling the wire back and forth into the channel to create a secure attachment. Another option is to use self-clinching fasteners, which are designed to hold two panels together. Adhesives, such as super glue or plastic bonder, can also be used to attach plastic to metal, but it is important to choose an adhesive that is compatible with the specific types of metal and plastic being used. In some cases, it may be necessary to first attach wood to the metal and then attach the plastic to the wood using nails or screws.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Type of plastic | UV-stabilized plastic sheeting, engineering plastics, carbon-fiber composites, thermoplastics, nylon, polypropylene, urethane, polycarbonate |
| Type of metal | Aluminum, magnesium, stainless steel, titanium, steel tubing |
| Adhesives | Super glue, plastic bonder, epoxy, plastic glues, self-clinching fasteners |
| Other materials | Wood, nails, screws, clamps, spring wire, lock channel, wiggle wire, bolt cutters, hacksaw, tennis balls |
| Techniques | Attaching wood to metal, gluing, welding, using heated tools, pressing, drilling, cutting, sanding |
| Tools | Safety gear, gloves, safety glasses, fine-grit sandpaper, damp cloth, razor blade, acetone, activator, dual syringe dispenser, Tek Screws, bolt and nut |
| Considerations | Ventilation, lighting, thickness of plastic, cost, durability, UV stabilizers, weight, temperature changes, impact resistance, water exposure, dirt exposure, debris exposure |
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What You'll Learn
Using glue
Gluing plastic to metal requires careful consideration of the materials being used, the qualities desired in the adhesive, and the purpose of the finished product.
If the plastic is polyethylene or polypropylene, use an adhesive designed for these plastics, such as Loctite Superglue All Plastics. Polypropylene is also used in vehicle panels, so ensure the glue is suitable for this application if that is your purpose. For most indoor repairs, a standard super glue will suffice. However, always check the manufacturer's instructions to ensure the glue is compatible with both plastic and metal.
Super glues, such as Loctite Super Glue Liquid Precision, are ideal for strong, precise bonding and are versatile enough to work on most plastics and metals. They also dry transparently, making them perfect for invisible repairs. If you are working with a larger surface area, try Loctite Super Glue Liquid Brush-On, which comes with a brush applicator for quick and easy application.
For exterior repairs or projects requiring high strength and permanence, an epoxy is recommended. Loctite Extreme Epoxy, for example, is a strong adhesive that works with metal and most hard plastics, creating extremely strong bonds in minutes.
When gluing plastic to metal, safety precautions are important. Work in a well-ventilated area and consider wearing gloves to protect your hands. Additionally, be mindful of the environment in which the finished project will be placed. For example, if the bond will be outdoors, consider using a waterproof adhesive like Contact Adhesive.
Finally, ensure that you follow the manufacturer's instructions for the specific adhesive you choose, paying attention to details such as timing and placement.
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Self-clinching fasteners
There are various types of self-clinching fasteners available, including:
- Standoffs: These fasteners create space between connected parts, allowing for direct contact.
- Stud fasteners: Pre-threaded bolts that are permanently anchored to a surface and used as connection points.
- Miniature nuts: Smaller-sized version of standard self-clinching nuts, used in miniature appliances and handheld devices.
- Floating nuts: Provide flexibility when joining assemblies with screws.
- Flush nuts: Similar to blind nuts, these create a flush installation on both sides of the sheet metal.
When using self-clinching fasteners, it is important to follow certain guidelines for proper installation. For example, the shank or pilot must be within the hole before applying force, and the force must be applied between parallel surfaces. Additionally, the fastener should be installed into the punch side of the sheet, and sufficient force should be applied to embed the clinching ring and bring the shoulder squarely in contact with the sheet.
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Spring wire poly lock channel
Greenhouse plastic can be secured to metal using a Poly Lock Channel and Spring Wire system. This fastening system is designed to secure greenhouse plastic, insect screen, shade cloth, or two layers of greenhouse plastic directly to your greenhouse, high tunnel, or hoop house frame, as well as to the front of your end wall.
The Poly Lock Channel and Spring Wire system consists of 6-foot pieces of single aluminum channel that can be purchased with or without the associated Spring Wire. The channel is first installed onto the frame, and then the Spring Wire is wiggled back and forth over the top of the material being installed and into the channel. This system provides a tight fit and is known to be strong, durable, and easy to install. It is also inexpensive and reusable.
When selecting a Spring Wire Poly Lock Channel system, it is important to consider the thickness of the plastic covering. For thinner plastic coverings of 5 or 6 mil, a coated wiggle wire is recommended to minimize abrasion on the plastic. For thicker plastic coverings of 9 to 12 mil, a galvanized wiggle wire is more suitable as it provides greater strength and durability.
In addition to the Spring Wire Poly Lock Channel system, there are other methods for attaching plastic to metal. One method is to attach wood to the metal frame and then attach the plastic to the wood using nails, screws, or a flexible Cinchstrap or Polyfastener. Another method is to use self-clinching fasteners that extend through the metal panel and then broach into the thicker plastic panel, offering a flush finish. Adhesive bonding is also an option that overcomes some of the issues associated with using threaded fasteners.
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Attaching wood to metal
When attaching wood to metal, it is important to consider the thickness and type of materials used to ensure a secure and lasting fit. Screws with coarse threads are typically the best choice for attaching wood to metal. This is because coarse threads have fewer threads per inch and are more aggressive, allowing them to penetrate and grip the wood effectively. Self-drilling screws, also known as Tek screws, are the most recommended type of screw for this purpose. They come with a drill bit end that enables them to easily cut through metal, eliminating the need for pre-drilling. Sheet metal screws are also effective for attaching metal to wood due to their sharp pointed tips and wide threads, making them a popular choice in construction and repair tasks involving both materials.
When attaching wood to metal, it is also crucial to consider the specific application and the environment in which the assembly will be used. For example, in outdoor applications where the assembly will be subjected to constant vibration, impact, temperature changes, and exposure to water and dirt, nylon-to-stainless steel adhesives may be used. Polypropylene-to-aluminium adhesives are suitable for vehicle panel applications, while urethane-to-steel adhesives are ideal for outdoor applications requiring impact resistance and environmental exposure.
Additionally, innovative techniques are being developed to join plastic to metal. Avraham Benatar, an associate professor at Ohio State University, has devised a method using a heated tool. The metal substrate is textured with a fine knurl pattern and heated. Then, a cool thermoplastic sheet is pressed against the hot metal surface, causing the plastic to melt and flow into the knurls. This creates a mechanically interlocking joint as the plastic cools and solidifies.
When attaching wood to metal, it is essential to select the appropriate type of screw and consider the unique characteristics of the application.
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Melting thermoplastics
There are several methods for joining thermoplastics to metal. One method, developed by Avraham Benatar, an associate professor of materials science engineering at Ohio State University, involves using a heated tool. The metal substrate is textured with a fine knurl pattern and heated to a high temperature. The hot plate is then retracted, and a cool thermoplastic sheet is pressed against the hot metal surface for a set time. As a result, the thermoplastic melts and flows into the knurls, creating a mechanically interlocking joint as it cools and solidifies. Increasing the heating time generally leads to stronger joints.
Another technique for joining thermoplastics to metal involves using threaded fasteners, such as self-clinching fasteners or threaded inserts. These fasteners are designed to extend through the thin metal panel and then broach into the thicker plastic panel, providing a strong bond between the two materials. Adhesive bonding is also an effective method for joining thermoplastics to metal, as it allows for load management across the entire bonded surface.
When working with thermoplastics, it is important to consider the glass transition temperature, which is the point at which the amorphous phase of the polymer begins to flow. Extruding at a temperature higher than the glass transition temperature reduces the polymer's viscosity and allows for easier flow. To heat thermoplastics, a large-capacity toaster oven or a fan oven can be used, ensuring that the plastic does not exceed its boiling point. Additionally, silicone or teflon surfaces can be useful when working with thermoplastics, as the material does not stick to silicone, and teflon provides a non-stick surface.
In some applications, it may be necessary to attach wood to the metal frame before attaching the thermoplastic. This involves securing wooden vertical studs to the ground plate and the wood framework, creating a permanent structure for building doors and vents. The thermoplastic can then be attached to the wood using fasteners or adhesives. This method provides stability and a secure attachment for the thermoplastic.
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Frequently asked questions
The industry standard for securing plastic sheets to a metal-framed greenhouse is to use lock channel and spring wire. This is a simple and economical method. However, you can also use wooden boards, attaching them to the metal frame and then attaching the plastic to the wood.
The best greenhouse plastic is UV-stabilized plastic sheeting made of 6-mil or thicker polyethylene plastic. This type of plastic is affordable and can provide cover for many years.
Self-clinching fasteners are one option for attaching plastic to metal without using glue. These fasteners are designed to clinch into metal and typically hold two panels together.
Yes, you can use glue to attach plastic to metal. Super glue is the easiest method and will work in many situations. You can also use plastic bonder, which is similar to super glue but with the addition of a primer or activator.
