Chloe Zhang
There are several methods to seal printing on plastic, and the best method depends on the type of printing and the desired outcome. For example, sealing vinyl stickers on plastic can be done with decoupage glue or polyurethane spray, while sealing inkjet prints may involve using laminating films, spray coatings, or varnishes. Additionally, creating waterproof and airtight 3D prints often involves adjusting printing settings and using epoxy resin or silicone conformal coating.
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What You'll Learn
Sealing vinyl stickers on plastic
To seal vinyl stickers on plastic, you must first select the right adhesive. Decoupage glue is the most suitable choice as it is strong and works well as both a sealant and adhesive. Polyurethane spray is another option, giving the sticker a protective satin clear varnish. You can also use a clear acrylic sealant or spray enamel for a waterproof finish. Regardless of the adhesive you choose, ensure that it is compatible with plastic surfaces.
Before applying the sticker, it is important to clean the plastic surface thoroughly to remove any dust or dirt that could compromise the sticker's adhesive properties. Wash the surface with soap and water, then allow it to dry completely before applying the sticker. Once the surface is dry, apply the sticker. Assess the strength of the adhesive and if it sticks, press the sticker firmly in place. If it does not stick well, you may need to use glue.
After the glue has dried and the stickers are firmly in place, you can begin the sealing process. If using decoupage glue, use a paintbrush to apply a thin layer of glue over the stickers and around the edges. Allow the first coat to dry completely, then apply a second coat. Repeat this process for additional coats if you desire a stronger seal. If using polyurethane spray, evenly spray the solution onto the sticker and its edges. Allow it to dry for 30 to 60 minutes, then apply another coat. Repeat this process three or more times for a stronger seal. Liquid polyurethane can be applied in the same way as decoupage glue.
By sealing your vinyl stickers, you can prevent issues like fading, curling, peeling, and cracking, ensuring that your stickers last for years.
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Using sealants to protect inkjet prints
Inkjet protective sprays are a fast and straightforward method of protecting inkjet prints on fine art papers from abrasion, fingerprints, ultraviolet (UV) light, and airborne pollutants. These sprays are ideal for smaller prints on inkjet art papers or photo papers with porous ink-receptive coatings. The spray creates a thin, transparent film that does not affect the structure of the paper. Protective sprays are commonly used for prints that are designed to be handled, such as notecards, album pages, or portfolio prints.
It is important to note that the spray lacquers used to protect water-soluble dye inks contain solvents, so it is recommended to apply the spray in a well-ventilated area and wear protective gear, such as goggles, to meet safety requirements. Some protective sprays available for protecting aqueous inks include Moab Desert Varnish, PremierArt PrintShield, Marabu ClearJet Original Type A, and Hahnemuhle Protective Spray.
Another option for protecting inkjet prints is to use laminating films. Pressure-sensitive "cold laminating films" are more expensive, but they can be applied without heat on less expensive, non-heated laminators. These films can be made of vinyl (PVC), polyester, polycarbonate, or other substrates. They use strong adhesives that are protected with a release liner until application. For smaller graphics, such as yard signs, a wide-format squeegee can be used to manually apply the laminating film. If using aqueous dye inks, it is recommended to encapsulate the print between two sheets of laminating film that are slightly larger, creating a sealed edge to prevent moisture from seeping in and causing ink bleed.
It is important to follow the ISO Standard 18902 for albums, framing, and storage materials for processed imaging materials. This standard specifies that enclosures be acid-free, lignin-free, and free of rubber adhesives and certain plastics. Additionally, the enclosure should contain an alkaline reserve to protect the paper from environmental acids.
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Sealing paper for resin
There are several methods for sealing paper for resin, including using a spray sealer, a laminating film, Mod Podge, and a heat-sealing method. Spray sealers are commonly used for smaller prints and artwork on porous, inkjet art papers. They form a fine, transparent film that protects the paper from abrasion, fingerprints, UV light, and airborne pollutants. Spray sealers are available at most craft stores and come in various finishes. When applying the spray, be sure to hold the can 6-8 inches away from the paper and keep the can moving to avoid creating drips or pools of sealer. Allow each coat to dry for 30 minutes to an hour before applying the next.
Another method is to use a laminating film, which provides a waterproof barrier as long as all edges are sealed. This method involves encasing the paper in a thin layer of plastic, protecting it from moisture. If you do not have access to a laminating machine, you can manually apply the laminating film by separating the plastic adhesive from its backing and placing the sticky side up. Then, align the paper, smooth its surface, and trim the excess laminating sheet, leaving a small border.
Mod Podge is another option for sealing paper for resin. It is a water-based sealer, glue, and finish that can be brushed onto the paper. It dries quickly and clearly, creating a strong bond. Be sure to cover all sides of the paper, including the edges, front, and back. When using Mod Podge, it is important to work on a protected surface, as the process can be messy.
Finally, a heat-sealing method can be used to melt a layer of wax or plastic onto the paper, creating a barrier between the paper and the resin. This method involves placing the paper between two layers of parchment paper and using a heated tool or an iron to apply heat evenly. It is important to note that this method may not always create a foolproof seal, and tape may be required to cover all edges completely.
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Using epoxy resin to seal 3D prints
Epoxy resin is a popular choice for sealing 3D prints as it gives them a high-gloss, glass-like finish. It also adds strength and waterproofing capabilities, making it ideal for both aesthetic and functional applications.
To seal your 3D prints with epoxy resin, you should first lightly sand the print to remove any rough spots and ensure the resin adheres well. Mix the resin according to the manufacturer's instructions, usually in a 1-to-1 ratio, and apply it using a brush or applicator. You can even use your gloved fingers. The resin should be applied in multiple thin layers to prevent drips and provide a smoother finish. Allow each layer to dry for at least 24 hours before applying the next one. The curing process can take up to 48 hours, so be patient and don't touch your prints during this time.
Epoxy resin is an excellent choice for sealing 3D prints that need to connect, as it acts as a strong bond. It can also be used to reinforce and strengthen your 3D designs, such as ashtrays and incense holders. You can even use food-grade resin to seal 3D prints for use in the kitchen or with children.
Using epoxy resin to seal your 3D prints will not only improve their durability but also add a professional, glossy finish. It is a straightforward process that can take your 3D prints to the next level.
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Preventing layer separation in 3D prints
3D printing has become increasingly popular in recent years, with applications in product development, customisation, and testing. However, 3D-printed parts are susceptible to layer separation due to the printing process. Here are some ways to prevent layer separation and create strong, reliable 3D prints:
Temperature Control: Temperature plays a crucial role in ensuring proper bonding between layers. Warm plastic bonds better than cold plastic. If your layers aren't bonding adequately, try increasing the printing temperature. For example, ABS plastic typically requires printing temperatures between 220-235°C to create a strong bond. You can adjust the temperature settings in your 3D printing software.
Layer Height and Nozzle Diameter: The layer height and nozzle diameter must be appropriately configured to ensure proper bonding. As a general rule, the layer height should be 20% smaller than the nozzle diameter. For instance, if your nozzle diameter is 0.4 mm, your layer height should not exceed 0.32 mm. You can adjust the layer height in the "Edit Process Settings" of your printing software.
Extrusion Width and Overlap: Adjusting the extrusion width and overlap settings can help create a complete seal between layers. For example, setting the extrusion width 30% larger than the nozzle diameter can improve sealing. Additionally, using multiple perimeters with an overlap percentage of more than 30% can help seal the perimeters effectively.
Flow Rate and Extrusion Multiplier: Increasing the flow rate or extrusion multiplier can help fill gaps and reduce layer separations. By extruding more plastic, you can minimise the gaps between layers. This can be adjusted in the software settings.
Vacuum Impregnation: This process seals micro-cavities and improves part integrity. It involves drawing a sealant into the walls of the part using a vacuum, creating a bond between the layers. While it won't remove surface defects, it can strengthen the material and prevent fluid or gas leaks.
Post-Processing: Some post-processing techniques can help seal your 3D prints. For example, MG Chemicals Silicone Conformal Coating is an aerosol spray that can be used to waterproof and protect electronics. It can also be applied to 3D prints, providing corrosion resistance. Applying multiple coats with drying time in between can create a durable seal.
By following these guidelines and adjusting your printing settings, you can significantly reduce layer separation in your 3D prints, resulting in stronger and more reliable creations.
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Frequently asked questions
To seal vinyl stickers on plastic, you must first clean the plastic surface with soap and water to remove dust and dirt. Once the surface is dry, apply the sticker. If the sticker does not stick, you will need to glue it down with decoupage glue. To do this, apply a thin layer of glue to the area where you intend to place the sticker, then press the sticker firmly in place. Leave the glue to dry for one to two hours, then apply a thin layer of glue over the sticker. You can add more coats of glue for a stronger seal.
Inkjet protective sprays are a popular method of protecting inkjet prints from scratches, abrasion, fingerprints, UV light, and airborne pollutants. These sprays form a fine, transparent film that does not affect the structure of the paper. However, sprays that contain solvents should be applied in a well-ventilated area, and you should wear goggles and/or a respirator. Some recommended protective sprays include Moab Desert Varnish, PremierArt PrintShield, Marabu ClearJet Original Type A, and Hahnemuhle Protective Spray. Another option is to use pressure-sensitive "cold laminating films", which can be made of vinyl (PVC), polyester, polycarbonate, or polyolefin.
To seal paper for resin, it is recommended to use a spray gloss paint or a resin gloss sealer spray. You can also use a clear drying white glue, or a water-based glue sealant such as Mod Podge.
To create a waterproof and airtight 3D print, you can use a product such as MG Chemicals Silicone Conformal Coating, which is an aerosol spray. Alternatively, you can increase your flow rate/extrusion multiplier to over-extrude plastic and fill in gaps. You can also increase your printing temperature to help layers adhere and seal up potential gaps. Printing with a flow rate of 150%, a large layer height, and a wide nozzle diameter also works well to create waterproof and airtight models.
