Lance Carson
Scratch-and-sniff technology has been used in popular culture for decades, from books and albums to video games and movies. The process of micro-encapsulation, which involves enclosing a desired smell in tiny, easily breakable capsules, is used to create scratch-and-sniff surfaces. This technology is also used in perfume advertising, where micro-encapsulated perfume oils are printed on paper, releasing an aroma when scratched or sniffed. This paragraph will explore the process of creating perfume scratch cards, from the ingredients used to the printing methods employed, and discuss the role of custom fragrances in the process.
| Characteristics | Values |
|---|---|
| Basic ingredients | Water, oil, scent, gelatin or a water-soluble polymer (usually polyoxymethylene urea) |
| Process | Micro-encapsulation |
| Micro-encapsulation steps | 1. Scented oil is added to a solution of water-soluble polymer in a reactor 2. The mixture is blended at high speed using a rotary blade until the beads of oil are very small 3. A chemical catalyst is added, and the polymer surrounds each bead of oil, forming a shell 4. The capsules are removed from the reactor and washed 5. The washed capsules are loaded into a tank and mixed with a water base to form a slurry 6. Adhesives are added to the slurry 7. The slurry is applied to paper using a variety of printing processes |
| Printing methods | Silk-screening, pretreating precut papers with a base coat of a special water-based adhesive |
| Application | Advertising, safety education, medical diagnosis |
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What You'll Learn
Micro-encapsulation
The process of micro-encapsulation is used to create scratch-and-sniff stickers. The desired smell is surrounded by micro-capsules that can be easily broken when gently rubbed, releasing the aroma. This process allows the aroma to be preserved for long periods.
The basic ingredients for the micro-encapsulation process are water, oil, scent, and either gelatin or a water-soluble polymer, usually polyoxymethylene urea. A chemical catalyst is used to initiate the reaction. A water-soluble adhesive is also required to attach the material to the paper during printing.
The process begins by adding scented oil to a solution of water-soluble polymer in a large vat or kettle called a reactor. The mixture is then blended at high speed with a rotary blade until the beads of oil are minuscule and cannot be seen with the naked eye. At this point, a chemical catalyst is added, causing the polymer to surround each bead of oil, forming a shell.
The newly formed capsules are then removed from the reactor and washed. They are placed on a belt that moves them through a spray of water. The number of washes depends on the intended use: scratch-and-sniff capsules are washed once, while fragrance strips are washed twice.
After washing, the capsules are loaded into a tank and mixed with a water base to form a thick slurry. Adhesives are added to the slurry for scratch-and-sniff applications. There are four basic methods of printing that can be used with the micro-encapsulated slurry: it can be silk-screened onto paper or applied with an offset press, flexographic press, or gravure press.
For fragrance strips, precut papers are pretreated with a base coat of a special water-based adhesive, which is extruded through pumps on the printer. The base coat is then dried in an oven before the slurry of micro-encapsulated perfume is applied.
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Scented oil
The creation of perfume scratch cards involves the use of scented oils, which are encapsulated in tiny beads that can be broken open by friction. This process, known as micro-encapsulation, was discovered by scientists working on carbonless paper technology. The basic ingredients for scratch-and-sniff applications include water, oil, scent, and either gelatin or a water-soluble polymer like polyoxymethylene urea (PMU).
To create the scented oil beads, scented oil is added to a solution of water-soluble polymer in a reactor. The mixture is then blended at high speed using a rotary blade, breaking down the oil into minuscule beads. A chemical catalyst is introduced, causing the polymer to form a shell around each bead of oil. These capsules are then washed, with scratch-and-sniff applications requiring one wash and fragrance strips needing two.
The resulting capsules are applied to paper or other surfaces using different methods, such as silk-screening or printing techniques. The micro-encapsulated scent can be printed onto various materials, including paper, plastic, stickers, and compact discs. This technology has been used to create scented advertisements, children's books, and even perfume sampling strips.
The scent is released when the micro-capsules are broken by scratching or rubbing, allowing the aroma to escape. This technology has improved over the years, increasing the longevity of the scent and the number of interactions that release it. The sense of smell is strongly linked to memory and emotion, making scented marketing a powerful tool for engaging consumers and enhancing their recall of the product.
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Paper printing
The process of creating perfume scratch cards involves several steps, and the paper printing stage is a crucial aspect of it. Here is a detailed description of the paper printing process for perfume scratch cards:
Paper Preparation
The first step in the paper printing process is preparing the paper surface that will be used for the scratch cards. This involves selecting the appropriate paper stock, which can be uncoated or coated, depending on the specific requirements of the project. The paper serves as the base for the scratch-and-sniff mechanism and must be compatible with the printing process and the adhesives used.
Micro-Encapsulation Process
At the heart of perfume scratch cards is the micro-encapsulation technology that encapsulates scented oils in tiny beads. This process is typically done in a reactor, a large vat or kettle. Scented oil is added to a solution of water-soluble polymer, and the mixture is blended at high speed using a rotary blade. This blending process reduces the scented oil droplets to a microscopic size, creating a uniform emulsion.
Capsule Washing and Slurry Formation
Once the micro-encapsulation process is complete, the capsules are removed from the reactor and carefully washed. They are placed on a moving belt that takes them through a spray of water to ensure they are clean and free of any residue. After washing, the capsules are loaded into a tank and mixed with a water base to form a thick slurry. Adhesives are added to this slurry to ensure it adheres to the paper during the printing process.
Printing Techniques
The slurry of micro-encapsulated perfume can be applied to the prepared paper using various printing techniques. One common method is silk-screen printing, where the slurry is silk-screened directly onto the paper surface. Another technique involves pretreating precut papers with a base coat of a special water-based adhesive, drying it in an oven, and then extruding the slurry of micro-encapsulated perfume onto the strip. This ensures that the perfume capsules adhere securely to the paper.
Varnish and Finishing
After the perfume slurry has been applied, a non-aqueous varnish may be applied to the paper to protect the scent and ensure its longevity. This step can be done by specialized companies or in-house, depending on the specific requirements. It is important to test the varnish beforehand to ensure it does not react with the ink or other coatings.
Drying and Curing
Finally, the printed paper needs to be properly dried and cured. This process ensures that the adhesives and coatings set correctly, securing the perfume capsules in place. The drying process may vary depending on the printing technique, paper stock, and adhesives used.
The paper printing process for perfume scratch cards involves a combination of specialized techniques and materials. It requires precision and careful handling to ensure that the scratch-and-sniff functionality is effective and long-lasting.
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Custom fragrances
Creating custom fragrances for perfume scratch cards can be done in several ways, depending on your desired level of involvement and the complexity of the scent.
One option is to work with a company that specializes in scented printing, such as Print-A-Scent or H&H Graphics. These companies can develop a custom scent for you, or you can provide them with your fragrance oil to be printed onto cards. They use microencapsulation, a process that encapsulates the fragrance in microscopic capsules, preserving the scent until the card is scratched. This method can be more costly and time-intensive, but it ensures a longer-lasting and more stable fragrance.
Alternatively, you can create scratch-and-sniff cards at home. One method shared by a company on Reddit involves printing stickers as usual and then applying a special matte laminate. Afterward, use a dropper to place a single drop of your chosen essential oil or fragrance onto the sticker. This method may be more affordable and accessible, but the scent may not last as long, and there is a risk of the oil breaking down the materials or causing sanitation issues.
It is worth noting that you can also choose to scent the entire card with a subtle aroma or add a designated scratch-and-sniff area. Companies like Scratch Off Systems offer both options and are willing to source specific fragrances if you have a particular scent in mind.
Overall, creating custom fragrances for perfume scratch cards can be a fun and unique way to engage your customers and leave a memorable impression.
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Scratch-release action
The scratch-and-sniff technology, also known as Scratch 'N Sniff™, is a special kind of perfume or scent-saturated printing. The scent is enclosed in tiny capsules that can be broken open by friction, a process known as micro-encapsulation.
The basic ingredients of scratch-release action are water, oil, scent, and either gelatin or a water-soluble polymer, typically polyoxymethylene urea. Firstly, scented oil is added to a solution of water-soluble polymer in a large vat or kettle called a reactor. The mixture is then blended at high speed with a rotary blade until the beads of oil are minuscule and cannot be seen with the naked eye.
A chemical catalyst is then added to the mixture, causing the polymer to surround each bead of oil, forming a shell. The newly formed capsules are then removed from the reactor and washed. They are placed on a belt, which moves them through a spray of water. The scratch-and-sniff capsules are washed only once, while perfume capsules are washed twice.
The washed capsules are then mixed with a water base to form a thick slurry. Adhesives are added to the slurry, which can then be applied to paper using various printing processes. Silk-screening, for example, is a method where the slurry is silk-screened onto paper. Alternatively, for fragrance strips, pre-cut papers are pre-treated with a base coat of a special water-based adhesive, dried in an oven, and then coated with the slurry of micro-encapsulated perfume.
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Frequently asked questions
The micro-encapsulation process involves adding scented oil to a water-soluble polymer solution in a reactor. The mixture is blended at high speed using a rotary blade until the oil forms tiny beads. A chemical catalyst is then added, causing the polymer to form a shell around each bead. These capsules are then washed and mixed with a water base to form a slurry, which is applied to paper using various printing processes.
The basic ingredients are water, oil, scent, and either gelatin or a water-soluble polymer, typically polyoxymethylene urea.
The scent is enclosed in micro-capsules that can be easily broken open by friction when scratched. This releases the aroma without it leaking out beforehand.
Perfume scratch cards are commonly used in advertising to promote fragrances, allowing consumers to sample the scent. They can also be used for educational purposes, such as helping to diagnose anosmia or teaching people to recognize dangerous smells like gas leaks.
