BOPP (Biaxially Oriented Polypropylene) films are known for their clarity, strength, and versatility. Thus, making them a go-to choice for packaging across industries. However, if you’ve worked with BOPP film for any length of time, you may have noticed an occasional color variation between rolls. In addition, even within the same roll.
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What causes these differences in appearance, and should there be concern?
At the heart of every BOPP film is polypropylene resin. Manufacturers follow tight specifications. However, natural variations in resin batches, especially when sourced from different suppliers. This may lead to subtle changes in the film’s visual properties. Furthermore, additives like slip agents, anti-static compounds, and UV stabilizers may influence the film’s tone and clarity. Particularly, if the formulation fluctuates slightly between manufacturing runs.
BOPP film is made through a complex orientation process, stretching the film in both the machine and transverse directions. Temperature, stretching speed, and cooling rates all play a role in how the film cures. Additionally, how light passes through it. Even minor adjustments to these parameters can affect gloss, haze, or tint. As such resulting in visual differences from one roll to the next.
Even within tolerance, slight variations in film thickness can change how light refracts through the material. Thicker areas (often referred to as gauge bands) may look slightly duller or darker, while thinner sections may appear clearer or lighter. These changes are typically cosmetic and do not impact film performance.
If the BOPP film is coated, printed, or metallized, additional layers introduce more opportunities for visual variation. In metallized BOPP, for example, aluminum uniformity is critical. Inconsistencies can cause differences in reflectivity and perceived color. Similarly, water-based or solvent coatings may appear uneven if drying conditions vary.
Over time, BOPP film can experience slight yellowing or haze—especially if exposed to heat, humidity, or UV light. Proper storage is essential to maintain the film’s original appearance. Rolls that have aged differently or were stored in varied environments may show subtle differences in tone.
In most cases, color differences in BOPP film are cosmetic. The film still performs its core functions—sealing, barrier protection, printability—without compromise. However, in high-visibility applications such as consumer-facing packaging, even slight visual inconsistencies can impact brand perception. That’s why consistent quality standards and thorough inspection are vital.
Color variation in BOPP films is a common, manageable aspect of flexible packaging production. Understanding the underlying causes—and partnering with a film supplier who prioritizes consistency—can ensure your packaging meets both visual and performance standards.
Choosing a label for your packaging is a big deal. You need something that sticks out, but also sticks on. Enter biaxially oriented polypropylene, or BOPP for short.
It’s a to-go choice for several food and beverage, beauty, household, and even medical equipment brands. But is it the right choice for your products? Let’s walk through the benefits of BOPP, its applications, options, pricing, and customizability.
Considering how commonly it’s used, you’ve probably passed by BOPP labels a million times at the store. BOPP is a type of plastic film commonly used for product labels. In simple terms, it’s a durable, clear material that’s been stretched in two directions during manufacturing. This stretching process enhances its strength and clarity.
Ask a brand using BOPP for their product labels why they prefer it, and they’ll tell you it’s highly versatile. These are some of the benefits that make BOPP the perfect fit for product labels.
Many packaging and labeling professionals consider BOPP to be one of the most durable label options available. It’s not susceptible to common problems affecting different labels like peeling, wrinkling, and lifting. Whether you use them on jars, bottles, or tubes, BOPP can last a long time.
Because BOPP labels are durable and made from plastic, they can resist most types of liquids. Something spills or splashes on your label? It won’t smear the writing on the label if you’re using BOPP.
Meanwhile, BOPP’s moisture and solvent resistant qualities make it a great choice for household products people keep in their bathrooms and kitchens. BOPP is also acid resistant, which makes it suitable for food and beverage product packaging. You won’t have to worry about products containing tomatoes, coffee, condiments, or citrus, which have a low pH content, degrading or discoloring your BOPP labels.
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The polymer film used for making BOPP labels accepts both water and solvent-based inks, giving you more options when choosing effects for your labels. Ink adheres well to BOPP because it goes through several treatment steps to improve its printability. The final treatment also improves the ink’s ability to stick to the label material.
Another interesting aspect of BOPP is its flexibility, which makes it easy to apply on rounded and flat surfaces with ease. And since it’s very thin, BOPP labels can look as though they’re directly printed onto their container.
BOPP is compatible with all types of packaging containers commonly used for consumer goods. From metal cans and glass jars to plastic containers, the right combination of BOPP film and adhesive is sure to stick.
Food labels made from BOPP film are FDA compliant as long as they mention the following:
BOPP labels designed and manufactured by companies like Blue Label Packaging meet FDA compliance standards for food packaging.
When it comes to cost, BOPP is more affordable than options like PET, while giving you the same level of durability and moisture resistance. While paper labels are cheaper to produce, they might not last as long, making BOPP a cost-efficient alternative.
You don’t have to settle for a simple, generic label when you choose BOPP film. Here are some of your available BOPP label options:
Though BOPP film labels come in different options, white is the most common choice. It’s used in the health and beauty, personal care, and cosmetic industries. You’ll also see white BOPP labels on food products by companies looking to make their branding stand out.
Transparent BOPP labels can give your product a sleek, no-label look, and is often used on beverages, household products, specialty foods, and cosmetic products. It has the same moisture resistant qualities of white BOPP, except that it’s almost invisible.
For a more luxurious appearance, you can also choose silver or holographic BOPP product labels. These have the same capabilities as clear or white labels, but offer a metallic finish.
BOPP-squeezable labels are made for product containers that contort with handling, like shampoo, condiment, and lotion bottles. They give you the flexibility, moisture resistance, and durability needed for products that take on frequent handling.
BOPP is a popular option for label materials—it offers impressive affordability and durability making it desirable for a wide range of products and industries.
Numerous food and beverage companies use BOPP labels because it’s waterproof, looks great, and is easy to read. It’s durable against acidic foods that might typically leave labels smeared or stained. The flexibility and thinness of BOPP labels make them easy to apply to round surfaces of food and beverage containers.
Packaging for health and beauty items like cosmetics require specific product information on the labels, so protecting against smudging, fading, and tearing is critical. These labels need to hold up in humid and damp environments. BOPP product labels are resistant to water from showers and sinks, oils that come off users’ hands, and the products inside them.
To sum it up, BOPP film is a versatile solution to labeling your products, whether you operate in the food and beverage, cosmetic, or household goods industry. It’s resistant to moisture, comes in various finishes, and is compatible with glass, metal, and plastic containers.