Packaging is the part of the product that is meant to protect it from damage. But it loses its purpose when it loses its firm structure upon contact with water? This blog is the answer to your concern about how to make cardboard boxes waterproof.
Most of the custom boxes are made of cardboard because of their high strength and affordability. But the biggest problem is that they become soft and weak in the presence of moisture. The good part is that they can be made waterproof with a few additions. These ways are listed as follows:
1. Waterproof Sprays For A Quick Result
There are moments when you do not have a lot of time but have to protect your customized cardboard boxes. Waterproof aerosol sprays come across as a handy option at this time. This method is easy because it does not require any kind of prep and takes only a few minutes to apply. These sprays are also commonly available at all places because of its easy to use nature.
Steps For Application
- First of all make sure that the surface of the boxes is completely free from all kinds of dirt or dust particles, so that the process is not hindered
- Hold the can at a distance of 8 to 10 inches from the box and spray in long overlapping strokes
- Try to avoid lingering in one spot because excess liquid pooling can cause the cardboard to sag
- Let the box dry in a ventilated area for some time to avoid a messy appearance.
- Apply a second coat at ninety degree to the first one to ensure complete coverage
Pros
Such waterproof cardboard boxes are achieved in no time because of an extremely quick drying process. They do not require any special preparation process or any kind of paintbrushes but they still manage to give a flawless look. The shape of the cardboard is also not affected when these sprays are used on it.
2. PVA Glue And Water For Budget-Friendly Options
There is no need to overspend when you can get affordable choices. If you are looking for a DIY option, then this should be your go-to choice. The common school glue that is used for everyday purposes is called Polyvinyl Acetate. It is mixed with water in equal proportions to create a liquid sealant.
Main Steps
- Mix PVA glue and water in a 1:1 ratio to achieve the smooth consistency of the resulting milk-like liquid
- Dip your brush into the mixture and apply it to the cardboard
- Make sure you do not apply too much liquid because it can saturate the cardboard surface and cause its fibres to separate
- Add backup layers of coating once the first one has dried out for maximum efficiency
Benefits
Waterproof cardboard eco friendly nature can be achieved through this process. This is because PVA is a water-based adhesive that does not release volatile organic compounds. It also degrades naturally in its raw form to ensure cardboard packaging does not end up in the dumps, polluting the environment. This also leaves no foul odour like the usual sprays used to make the boxes waterproof.
3. Paraffin Wax To Guarantee Long-Term Storage
Wax is a classic solution for making retail boxes made of cardboard resistant to damage caused by water contact. Both paraffin and beeswax can be used to make sure that the cardboard surface becomes impenetrable. The wax coating can increase the shelf life of the boxes by making sure they do not lose their original structure in humid environments.
How To Apply?
- Place your wax blocks inside the top pot of your double boiler. Gently simmer the pot after the lower pot with water.
- Do not expose the petroleum-based paraffin wax directly to the flame because of its combustible nature
- Dip your brush into the molten wax and apply it to the cardboard in swift and long strokes
- The wax cools down immediately which is why it is important to make sure that the application process is carried out quickly to prevent the formation of hard clumps
Advantages
Wax coating is the common option for making sure your boxes become completely waterproof. The coated boxes can also be used for a longer time because of the seal that does not let them collapse in environments with high moisture content. But it does add weight to the box and makes it difficult to fold in the long run.
4. Polyurethane Or Epoxy Resin That Give High-End Results
Sealants with a plastic base make sure that the cardboard surface turns into something that has exceptionally high water resistance. This process infuses the paper fibres with synthetic polymers to make it strong enough for heavy-duty applications. It also gives a premium appeal to the waterproof cardboard boxes by giving them a smooth look.
Application Process
- Stir the can of polyurethane thoroughly but do not shake it because it can trap bubbles. If you are using two part epoxy resin, measure and mix the resin and hardener in a clean cup at the exact ratio
- Paint a thin uniform layer of resin on the cardboard product packaging
- Let the first layer dry completely in a ventilated space
- Lightly scuff the surface with sandpaper to remove any kind of bumps once the solution is cured.
Best Uses
This method offers the highest level of waterproofing possible. It ensures that the box does not collapse when more weight is added to it by strengthening its structure. This is why the cardboard product packaging cured with resin can be used to store and display items with a higher weight.
Tips for Perfect Waterproofing
All these methods perform amazingly well if they are sealed properly. Improper sealing can do more damage to the cardboard packaging because of its shortcomings. These are some suggestions that make sure the boxes become actually waterproof:
Focus On The Edges
Usually the focus is on the centre of the cardboard box when different methods are being carried out to make it waterproof. But if the edges are not considered there is a chance that the next time packaging comes into contact with water, it can give way to moisture. This is why it is important to dab your sealant directly into these open holes until they are completely saturated and plugged.
Do Multiple Coats
Cardboard is highly absorbent. The paper fibres will absorb too much moisture at once if you apply thick layers. This causes the fibres to swell and expand unevenly which can sag with time. It is better to apply thin coats to multiple items to get durable waterproof cardboard sheets.
Assemble Before Sealing
The cardboard becomes stiff and rigid if you apply any kind of coating on it while it is flat. Its lines will crack and split open when you try to assemble them. This is why it is better to assemble your box before trying out any method to make it waterproof.
Final Remarks
Now you are aware of multiple methods to make cardboard waterproof. You can choose any of the following options based on how much water exposure the box will actually face. All these methods ensure that the cardboard packaging is itself protected from damage that moisture can cause. If you are a brand that is looking for durable cardboard boxes, contact CustomBoxesMarket in Canada and enjoy customized packaging with a vast range of coating options that can make it waterproof.