When to Use OPP bag for packaging snack bars？

Jul. 02, 2024

This Common Packaging is a Recycling Nightmare

Energy Bars and Foil Lined Packaging: A Tale of Two Crazes

The Emergence of Foil Lined Film

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You likely think of balloons when you hear the word mylar.

But Mylar is the brand name for a unique type of stretched polyester film, commonly known as BoPET - Biaxially oriented PET film (BoPET), which is commonly metalized. NASA's Echo II balloon was launched in and constructed of 9 micrometers thick Mylar film sandwiched between layers of 4.5 micrometers of thick aluminum foil.

Thus, multi-layered flexible film was born. Once developed, food companies quickly began using it to package their goods.

In the s, Capri Sun began pouring its juice drinks into their iconic gusseted pouches made of melded, ultra-thin layers of plastic and aluminum foil.

Potato chips began being packaged and sold in metalized films consisting of layers of biaxially oriented polypropylene (BOPP), low-density polyethylene (LDPE), and thermoplastic resin.

They found that these various layers could collectively keep chips fresh and crisp much longer than their previous packaging could (because stale, soggy potato chips are pretty gross).

Today multi-layered film made with plastic and aluminum is ubiquitous and is used for everything from snack bags to candy wrappers to baby food pouches to energy bars. We bet you have had a snack or convenience item packaged in a metalized film within the last 24 hours!

The Rise of The Energy Bar

Like metalized film, energy bars also had their origins in NASA and space exploration.

Pillsbury first created Space Food Sticks in the s for NASA astronauts and, soon after, filed a trademark for a 'non-frozen balance energy snack in rod form containing nutritionally balanced amounts of carbohydrate, fat, and protein'.

In , Pillsbury repackaged their astronaut food for consumers, marketing them as a 'nutritionally balanced between-meal snack'. Power Bar entered the scene in , founded by a Canadian marathoner, Brian Maxwell, who was 'creating the perfect energy bar to help athletes survive long-distance events without running out of glycogen.'

Competitors emerged soon after, including Clif Bar, which is now arguably one of the most popular energy bar brands that serve the needs of endurance athletes and busy moms trying to feed themselves and their kids.

Today, the market for health, energy, and protein bars includes a few heavy hitters (Clif Bar, Larabar, Power Bar, Muscle Milk, Rx Bar) as well as emerging startups (such as Scratch Labs, Verb, and This Bar Saves Lives).

The vast majority of energy bar wrappers are made from two layers of flexible polypropylene plastic with aluminum sandwiched in between. The packaging ensures the bars stay fresh, tasty, and healthy for as long as possible.

While Clif Bar does not have an official public statement on the shelf life of a standard bar, most bars we have come across have best buy dates that are at least a year out. Keeping a naturally produced product like an organic energy bar fresh and safe for over ONE YEAR is no small feat, and this innovative multi-layered packaging is to credit for this.

Another advantage of these multi-layers metalized films is that it produces gorgeous prints, allowing energy bar brands to shine on retail shelves. A single layer of film typically cannot provide the level of safety and preservation a bar needs while also being an excellent printing surface.

A Recycling Nightmare

Unsurprisingly, the increased convenience and shelf life of these foil-lined wrapped energy bars come at the expense of sustainability.

Not only are these wrappers never made with recycled content, but they are also extremely difficult to recycle. Our team has searched dozens of curbside recycling programs nationwide and has yet to find a single one that accepts foil-lined (metalized film) wrappers.

The reason for this is twofold.

1) Flexible film, in general, is terrible for curbside recycling programs. Single stream recycling is typically taken to a materials recovery facility (an MRF) where a combination of talented workers and insanely expensive, massive equipment quickly sorts plastic, paper, corrugate, glass, aluminum, and more. Flexible plastic (whether it is multi-layers or not) gets caught in the gears of this equipment, leading to costly repairs and even costlier halting of plant operations.

2) Before multi-layered films can be reground or remelted, the different layers have to be separated (and to be separated, a human or machine has to identify what materials are in a wrapper). Equipment has been developed that can separate some types of metalized film. However, the process is energy-intensive and expensive, and as such, only a few reclaimers have made this investment thus far.

Additionally, when recycled metalized wrappers are separated, some of the material is often landfilled. For example, film that is 18% foil and 82% plastic is separated. The foil is discarded and the plastic is recycled.

What is an Energy Bar Lover to do?

You have a few options.

1) Stop eating store-bought energy bars. Nutritionists often lament the fact that energy bars have become a meal replacement or daily snack for so many of us, even when we are not in the midst of a marathon or Ironman. By relying on the energy bar as a standard meal, we are losing the benefits of whole, unprocessed food.

If you need access to a quick snack to avoid becoming your hangriest self, switch to healthy snacks that are not packaged as single-serve, such as peanut butter. Or snacks with packaging designed by nature, such as bananas.

For some of us, this switch is doable. For others, letting go of the convenience of that stash of bars in your purse or desk is unthinkable. Or even harder? Letting go of the bar in your diaper bag you know can help feed a hungry or tired kiddo. We get it!

2) Utilize a mail-in recycling program. TerraCycle and Clif Bar created a free recycling program* for energy bar wrappers (and other similar metalized wrappers). Participants collected their waste and sent it to TerraCycle who then upcycled or recycled wrappers.

*Note: as of early , Clif bar no longer recycled with TerraCycle. Please let us know if you come across any recycling solutions for these!

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Upcycling means wrappers are converted into items like wallets, purses, and totes (which can be purchased on sites like Home Dweller). Recycling means that TerraCycle will sell these recycled wrappers to a reclaimer who has invested in the equipment needed to extract the different materials.

The great thing about this program is that it provides an outlet for those who want to ensure their wrappers do not end up landfilled or, worse, as ocean pollution. It is also free for consumers (supported by Clif Bar), and Clif Bar donates $0.01 per wrapper to American Forests American ReLeaf Program. Our favorite part of the program is that even though Clif Bar sponsors it, they will accept any foil-lined energy bar wrapper!

On the other hand, recognize how much packaging, shipping, and time is required to collect these items and send them out. TerraCycle recommends making shipments when the entire collection of wrappers is over 5lbs to ensure the shipment's carbon footprint does not outweigh the benefits of recycling.

Additionally, some people question the ecological merits of the upcycling and recycling process of these wrappers. While repurposing wrappers into handbags creates a cool, niche product, some argue it generates another unnecessary novelty item.

Hopefully, we can move towards technology that can efficiently separate the various film layers in a way that enables each layer to be fully recycled into new, needed material.

3) Look for alternative bars.

A handful of emerging companies are changing the game for energy bar wrappers.

Unwrapp'd is trying to change the format of energy bars into bites that can be stored in curbside recyclable jars.

Made in Nature makes a great line of energy balls and bites that may give you the boost you need without the single-serve packaging.

Creation Nation is one of the many brands that provide energy bar mixes, allowing you to make your energy bars at home (which you can then package in reusable storage containers or beeswax wraps.

Regrained has been experimenting with new packaging innovations, though the progress has been challenging thus far. They began using a single layer of compostable cellulose film for their packaging. Soon after, they heard reports of stale products and frustrated customers from the field. While continuing their research and development for a more sustainable and functional wrapper, they switched to multi-layered metalized film, recognizing that tons of stale, discarded product was a worse form of waste than their wrappers. Regrained's experience highlights how difficult packaging innovation can be in this space, and progress requires persistence and a willingness to believe in what is possible even in the face of short-term setbacks.

How to Recycle ... Shipping Supplies Edition

We look forward to continued advancements in the world of energy bar wrappers and the recyclability of these products. Here at EcoEnclose, we pride ourselves on our mission of building towards a circular economy. If you're interested in learning more about how to recycle (or better yet, reuse) your EcoEnclose packaging, check out our Recycling Guide and Recycling Tips and Tricks.

How to distinguish between PP, OPP, and BOPP bags

When it comes to plastic packaging, the food industry predominantly uses the BOPP bags or films. BOPP bags are easy to coat, print and laminate, hence making them most suitable for packaging products like snacks, fresh produces and confectioneries. Parallel to BOPP, PP and OPP bags are also available in the market which are used in packaging. In all the three, Polypropylene is common which is the basic polymer for the manufacturing of these bags. PP stands for Polypropylene, OPP stands for Oriented Polypropylene, and BOPP stands for Biaxially Oriented Polypropylene. They differ in the style of their fabrication.

Polypropylene, also called are polypropene is a semi-crystalline thermoplastic polymer. It has high impact resistance and is strong and tough. Popular packaging packets like ziplock pouches, standup pouches, and spout pouches are made from Polypropylene. At first sight, it is difficult to distinguish between the PP, OPP, and BOPP plastics. However, one can feel the difference by touching as OPP feels brittle whereas PP is softer.

The best way to distinguish between PP, OPP and BOPP bags is by understanding their use in the real world objects. The Polypropylene bags or PP bags are used as non-woven bags. These are treated to make them water or moisture absorbent. Sanitary napkins, diapers, air filters, etc are some of the common PP products. The same material is also used in the manufacture of thermal clothing as they provide a temperature barrier.

The OPP bags have high tensile strength, and are transparent in colour. These can withstand high temperatures but get wrinkled if used roughly. Transparent adhesive tapes are also made using the same formulation. These are hard to tear and OPP bags are used in the packaging of leather products, clothing, etc.

The BOPP bags are crystal clear polyethylene bags. Their art of manufacture i.e. bi-axially orientation gives them a transparent appearance and this makes them suitable for branding via printing on their surfaces. BOPP bags are largely used for retail packaging. The biaxial orientation increases their strength and hence they are preferable to carry greater loads. The BOPP bags are waterproof. The products inside them can be safeguarded against moisture for a much longer span of time. And that is why these are the most desirable choice in the cloth packaging industry.

The Polypropylene derivatives i.e. the PP, OPP, and BOPP are resistant to organic solvents, acids, and alkalies. That is why these are widely used in the packaging industry where transportation and storage under changing atmospheric is unavoidable. Like cling films, they protect the product from moisture and dust. These are recyclable and their manufacture involves lesser carbon footprint. So from the environment perspective as well, the PP, OPP, and BOPP bags are sustainable choice.

You can also buy non woven bags and vegetable and fruit crates on Bizongo.

Read more about how packaging can drive sales and about innovative tissue papers on our main blog here.