Maya Ellison
Plasticizers are substances that increase the plasticity of materials and are used in a wide range of applications, from rubber and concrete to inks, paints, sealants, and adhesives. They are commonly used in screen printing inks to improve their flexibility, pliability, and durability. While plasticizers enhance the performance of screen printing inks, concerns have been raised about their environmental impact and potential health risks. Phthalates, for example, are a group of industrial chemicals used as plasticizers that have been linked to serious medical issues. As a result, regulations and standards for screen printing inks have become increasingly important. In the United States, the Food and Drug Administration (FDA) evaluates the safety of printing inks, particularly those used on food packaging, to ensure they meet regulatory compliance and protect consumer health.
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What You'll Learn
The US Food and Drug Administration (FDA) evaluates printing inks
The FDA's General Safety Clause and Good Manufacturing Practice (GMP) requirements are applied when evaluating printing inks. The FDA's GMP regulatory requirements for packaging materials mandate that food contact substances be of suitable purity for their intended use and not impart harmful substances or off-tastes to food. The "Functional Barrier" principle is also considered, which relates to the barrier properties of the packaging material and the potential for ink to migrate to the food product.
The chemical composition of printing inks can vary from simple to complex, and they may contain substances such as colorants, carriers, additives, and processing aids. Inks used for food packaging must comply with the Federal Food, Drug, and Cosmetic Act of 1938, which defines substances that are expected to migrate to food as food additives requiring regulatory clearance by the FDA. However, there is no specific regulation for printing inks, and they may be considered exempt from regulation if they are not expected to come into contact with food.
The FDA evaluates printing inks on a case-by-case basis, considering factors such as food types and conditions of use. The agency does not provide a specific definition for the term "functional barrier", but several of its food additive regulations incorporate this concept. Overall, the FDA's evaluation of printing inks aims to ensure the safety and purity of food products and prevent any potential adverse effects on consumers.
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Plasticizers are used to increase flexibility and pliability
Plasticizers are valuable and essential to industries worldwide. They are used as a common additive to polymer chains to make various materials more durable and flexible, among other desired properties. They are commonly added to polymers and plastics such as PVC to facilitate handling during fabrication or to meet the demands of the end product's application.
Plasticizers are non-volatile chemical solvents that increase the flexibility, pliability, durability, longevity, biodegradability, and extensibility of polymers. They affect the properties of the material without fundamentally changing its basic chemical makeup. By modifying the type or amount of plasticizer, properties can be tailored to meet specific requirements, such as high tensile strength or softening the material.
In the context of screen printing inks, plasticizers are added to increase the flexibility and pliability of the dried print, reducing the likelihood of cracking and loosening of the printed colours. They are typically added to brittle inks that dry by evaporation, such as solvent and plastisol inks. Plastisol inks, which are commonly used for screen printing, are made from PVC (polyvinyl chloride) and plasticizers, resulting in thicker and more opaque inks compared to water-based alternatives.
While plastisol inks are popular due to their versatility, ease of use, and ability to be printed on various fabrics, they have come under scrutiny for their environmental impact and potential health risks. Phthalates, a group of industrial chemicals used as plasticizers, have been linked to serious medical issues from direct contact and the release of waste/by-products into water systems. As a result, there has been a push for alternative inks, such as soy-based and water-based inks, which are considered more eco-friendly but may have their own limitations in terms of formula stability and drying time.
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Phthalates are a group of industrial chemicals used as plasticizers
Plastisol inks, which contain phthalates, are widely used in the screen printing industry due to their versatility, ease of use, and ability to produce vibrant results on any color fabric. However, concerns have been raised about the potential health and environmental impacts of phthalates. Some studies suggest that exposure to phthalates, especially during childhood development, can negatively affect the endocrine system, reproductive system, neurological system, and metabolic homeostasis. As a result, several countries have established restrictions and regulations on certain types of phthalates, such as the six regulated ortho-phthalates that are known to be more dangerous.
It is important to note that not all plasticizers are phthalates, and there are alternative options available. For example, benzoates and citrates are common types of non-phthalate plasticizers used in screen printing inks. Soy-based inks are also being explored as a more eco-friendly alternative, although they are still relatively new to the market and more expensive. Water-based inks are another alternative, but they have longer drying times and may not produce opaque prints on dark fabrics.
While some phthalates are regulated, it is important to recognize that the specific regulations vary across different countries and jurisdictions. For instance, the governments of Australia, New Zealand, Canada, the US, and California have determined that many phthalates are safe in the amounts typically found and therefore do not require regulation. On the other hand, the EU has restricted the production and import of certain low-molecular-weight phthalates, allowing them only if specific authorization has been granted for a particular use.
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Plastisol is a popular type of ink for screen printing
One of the key advantages of plastisol is its durability. Once cured, the ink is very tough and can withstand multiple washes without fading or cracking. This makes it a popular choice for printing on garments that will be frequently used, such as t-shirts, athletic jerseys, and hoodies. Plastisol inks are also less expensive than many other types of inks, making them a cost-effective option for screen printers.
However, plastisol inks have some drawbacks. They are not as eco-friendly as water-based inks, and they can contain harmful chemicals that can impact the environment and human health. Additionally, plastisol inks can be more difficult to work with due to their chemical sensitivity. For example, using the wrong additives or adding too much of an additive can affect the curing process, leading to issues with the printed design.
Despite these concerns, plastisol remains a popular choice for screen printers due to its ease of use, versatility, and durability. It is important for printers to be aware of the potential risks associated with plastisol inks and to follow the manufacturer's instructions for usage and storage to ensure the best results.
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Disposal of waste inks is strictly regulated
The specific disposal method will depend on the type of ink and the presence of any hazardous substances. For example, leftover tattoo ink is considered medical waste and requires special handling. In some cases, waste ink may be classified as hazardous waste and must be disposed of accordingly. This includes waste ink from commercial printers and large-scale presses, which may contain harmful chemicals.
It is important to note that waste ink should never be poured down a sink or toilet, as this can cause plumbing issues and is prohibited by local and state regulations. Instead, waste ink should be disposed of in a sealed container and placed in a designated area for collection by a waste management company or taken to a hazardous waste facility. Some waste management companies, like Discount Dumpster, offer special waste disposal services for inks and resins.
There are also alternative methods for disposing of waste ink. One method is to use a waste ink recovery system, such as a Printer Potty, which collects the waste ink in a suitable container. Another method is to mix the waste ink with an absorbent material, such as cat litter, and dispose of it as solid waste once it has dried. However, it is important to note that this method may not be permitted in all locations, and it is essential to check with local regulations before proceeding.
Overall, the disposal of waste inks requires careful consideration to ensure compliance with regulations and to minimize any potential harm to the environment or human health.
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Frequently asked questions
The US Food and Drug Administration (FDA) evaluates the safety of printing inks, especially those applied to the outside of food packaging. However, there is no single food additive regulation specific to printing inks. Instead, the FDA considers factors like the substrate composition, ink application, and intended use. While plasticizers are not directly mentioned, they are components of printing inks and likely fall under the FDA's evaluation process.
Plasticizers are substances that increase the flexibility and pliability of dried prints. They are added to brittle inks to minimize cracking and ensure the ink's ability to adapt without losing integrity during the printing process. This characteristic, known as plasticity, contributes to printing accuracy.
Benzoates and citrates are commonly used plasticizers in screen printing inks. Benzoates are popular due to their fast-fusing properties, stain resistance, and low moisture sensitivity. Citrates, on the other hand, are known for their high flexibility, even at low temperatures. They are also colorless and odourless, making them ideal for screen printing applications.
