What is the Advantage and Disadvantage of Rpet Bags Manufacturer

About 49% of the world’s clothing is made of polyester, and forecasts show this to nearly double by . The Athleisure trend has led a growing number of consumers to be interested in more flexible, more resistant garments. But polyester isn't a sustainable textile option, as it's made from polyethylene terephthalate (PET), the most common type of plastic in the world. In short, the majority of clothes globally come from crude oil.

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Recycled polyester, also known as rPET, is obtained by melting down existing plastic and re-spinning it into new polyester fibre. To give an example, five water bottles yield enough fibre for one t-shirt.

While recycling plastic seems like an obvious win for sustainability, rPET has both advantages and challenges. Here’s a breakdown of the pros and cons.

Recycled polyester: The pros

Keeping plastics from going to landfill and the ocean

Recycled polyester gives a second life to a material that’s not biodegradable and would otherwise end up in landfill or the ocean. Eight million metric tonnes of plastics enter the ocean every year, on top of the estimated 150 million metric tonnes that currently circulate in marine environments. If we keep this pace, by , there will be more plastic in the ocean than fish.

Recycled polyester is just as good as virgin polyester but takes fewer resources to make

Recycled polyester is almost the same as virgin polyester in terms of quality, but its production requires 59% less energy compared to virgin polyester. Manufacturers of recycled polyester aim to reduce CO2 emissions by 32% in comparison to regular polyester. In addition, recycled polyester can contribute to reducing the extraction of crude oil and natural gas from the earth to make more plastic. 

Increasing adoption by leading brands

So, many major brands are committing to rPET.

• Adidas made a pledge to use only recycled polyester in its products by .
• Patagonia, a pioneer in sustainable apparel, has been using rPET since .
• H&M Group is collaborating with Syre to develop textile-to-textile recycled polyester.

These efforts demonstrate a shift toward circularity in fashion, reducing the industry’s environmental footprint.

Recycled polyester: The cons

Recycling plastic has its limitations 

Many garments are not made from polyester alone, but rather a blend of polyester and other materials. But even pure polyester garments can’t be recycled indefinitely.

There are two methods for recycling PET:

• Mechanical recycling breaks down plastic into small chips, which are then melted and reformed into fibres. This process degrades the fibre's strength over time, often requiring the addition of virgin polyester to maintain quality.
• Chemical recycling restores polyester to its original monomer state, allowing it to be reused like virgin polyester. However, this method is more expensive and less widely used.

The process of recycling PET impacts the environment

The polyester chips generated by mechanical recycling can vary in colour. Some turn out crispy white, while others are creamy yellow, making colour consistency difficult to achieve. Some dyers find it hard to get a white, so they’re using chlorine-based bleaches to whiten the base. The inconsistency of dye uptake makes it hard to get good batch-to-batch colour consistency and this can lead to high levels of re-dyeing, which requires high water, energy and chemical use.

Recycled polyester releases microplastics

Last but not least, some counterargue the affirmation that recycled polyester keeps plastic from ending up in the oceans. They still do a little, as man-made fabrics can release microscopic plastic fibres — the infamous microplastics. According to a study by a team from Plymouth University in the UK, each cycle of a washing machine could release more than 700,000 plastic fibres into the environment.

To help prevent microplastic pollution when washing items, you can place them in a filter washing bag to prevent shedding during the wash.

Where are the next developments in recycled polyester?

Many brands are strengthening their recycled material ambitions. A great example of this is H&M Group, which is collaborating with other players in the industry, like Syre, to achieve this. Its aim is to scale textile-to-textile recycled polyester.

The Accelerating Circularity initiative has also recently launched its rPolyester Database of commercially available textile-to-textile recycled polyester. 

As with most sustainable materials, there are both positives and negatives but going down a sustainable route will help reduce the impact fashion is having on the environment.

If you're interested in learning more about the different branding materials, their applications and use cases, download our Packaging Innovation Toolkit to get all the insights. 

Context

The pros and cons of recycling PET bottles and other plastic waste

Recycling PET plastics, for example in the form of rPET bottles, and other forms of plastics, has become very important over the last several decades.

Not only is recycling a more sustainable way of dealing with waste, waste, in itself, has also largely changed to becoming a valuable resource of raw materials, like rPET for packaging. 

Before we dive in, here’s an overview of some of the most important pros and cons seen from our perspective as an innovator in sustainable colorants for plastics.

Recycled plastic is obtained either by melting used, sorted plastic - resulting in granulates- and turning these into new articles (mechanical recycling), like fiber for clothes.

Or by reverting it to its original building blocks and producing new plastic (chemical recycling). In both cases, much of this material comes from used items, such as plastic bottles, containers and so on that have been collected by consumers, retailers and waste deposit schemes.

The pros of recycling polyester (PET) and other plastics:

• Recycling prevents plastics from being incinerated, or going into landfill or ending up as marine litter. This matters because, in some estimates, if we keep dumping plastic at our current rate, in 30 years there will be more plastic than fish in our oceans.
• Recycled PET (rPET) is as good as virgin polyester and its production requires significantly less energy. Next, CO2 emissions are 50%, or even less, compared to regular polyester.
• Recycling reduces demand for crude oil and natural gas and reduces emissions from incinerators.
• The potential uses of recycled plastic, and rPET in particular, are growing. Existing applications: bottles, sheets, clothing and much more.
• Recycling plastic creates jobs and helps to drive innovation in recycling.
• Chemical recycling, unlike mechanical recycling, has the potential to make plastics infinitely recyclable without any loss of performance.
• Different plastics can be repurposed for different applications, such as textiles, insulation, chairs and benches, and so on.
• Governmental pressure in legislation is increasing. In , 50% of all plastic must be recycled in Europe. Changing the design of plastic products and their packaging could increase the recycling opportunities enormously.

The cons of recycling polyester and other plastics:

• Mechanical recycling, which involves washing, shredding and melting used plastic, weakens that plastic over time and can result in discoloration (yellowing). In the case of rPET, the lower mechanical strength is compensated in both the recycling process and with the addition of Virgin PET in the use phase.
• Chemical recycling returns a waste plastic product to its original small molecules (monomers) or small fragments. These are indistinguishable from the ones used in virgin plastic production and can be fed into the regular polyester manufacturing system. But chemical recycling is a more expensive process than mechanical recycling.
• Recycled plastic used to create textiles releases microplastics when washed. These microplastics reach the oceans and cause pollution.
• Some people argue that recycling plastic blinds us to the real problem – the use of plastic, most of which does not get recycled, either because of a lack of technology, infrastructure or economics.
• Coloring is a challenge when recycling PET due to the variability and impurities in the recycling feedstock. This makes it hard to keep color consistent between batches.

Costs

Background: What is rPET and why is it so expensive?

rPET is recycled PET.  It is what is made after the initial PET product (usually packaging) is used by the consumer after which it is collected to be recycled. The used PET is then processed in a recycling plant, decontaminated and turned into rPET suitable for indirect food contact, often times in the form of pellets or flakes.

All Food Contact grade rPET recycling operations have to have an EFSA approval. So basically rPET packaging, such as rPET bottles is simply PET that has been turned into rPET, fit for food contact. 

While virgin PET is clear, recycled PET comes in a variety of color shades and corresponding prices. These color differences are caused by remainders from their previous life influencing the value of the recycled material.

The clearer the recycled plastic is, the higher the value and the higher the price – to the point where high quality rPET is often more expensive than virgin PET. The result is that it can make more sense for processors and brand owners to use higher levels of virgin PET simply to remain cost competitive.

Costs

Factors driving up rPET prices

The reality is that high quality clear rPET is expensive. To fully understand why this is, it’s important to understand some of the underlying mechanics driving up the price.

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New Regulations

There are new European regulatory requirements that mandate that as of , PET bottles must contain on average 25% rPET. This means that in the European Union, these new requirements are creating a massive demand for high quality rPET in order for brands to be able to continue to sell in this region. In the Americas similar drivers are arising.

Below is an overview of some of the regulations:

• The EU has mandated the industry to include 25% recycled content in PET bottles by and 30% in all plastics bottles by under the Single-Use Plastics (SUP) Directive.
• Likewise, in the US state of California, manufacturers are required to include an annual average of 15% PCR in beverage containers starting in . By , the mandate is set to increase to 25% and by to 50%.
• Washington state has also recently announced a schedule for post-consumer recycled (PCR) requirements for different product categories, starting with beverage containers and trash bags in , adding certain household cleaning and personal care products in , and expanding to dairy milk containers in .

Source: PackForward | Laws and regulations

Commitments Of Global Brand Owners

We’re also seeing a large push from brand owners who are moving in the direction of rPET packaging (like rPET bottles) independently and setting even higher targets for themselves than the 25% rPET content.

So beyond the initial demand, these goals for even higher percentages of rPET are driving up demand even further. It is up to the market to develop suitable solutions the address this increasing demand and avoid transitions to alternative, less desirable packaging materials.

Varying Quality rPET

The quality of mechanically recycled rPET can vary greatly. The quality is influenced and impacted by several different factors like the effectiveness of sorting and contamination. This means that there is a high demand and poor availability of high quality, clear rPET, the cost of rPET is sky-rocketing.

Conclusion

Costs: Conclusion

These factors all contribute to a massive demand for high quality rPET for rPET packaging. The industry is putting a lot of efforts on making more high quality rPET available through better collection, separation, sorting, washing and reprocessing.

We’re witnessing a shift in terms of food contact rPET purchase strategy. Brand owners have actively sought out ways to secure a steady supply of rPET that meets their standards by investing in and widening the Deposit Return Schemes and reprocessing facilities.

This ensures a steady flow of rPET which can be collected and processed according to their standards. More recently integration, consolidation and expansion of recycling capacity in the value chain has become the standard. But high quality rPET is still scarce. In order to hit the 25% rPET mark for PET bottles, concessions in quality of mechanically recycled rPET most likely have to be made.

Now obviously there can be no concession in food contact safety, but there are other alternatives to ensure a steady supply of high quality rPET. But what factors diminish the quality of rPET in the first place?

Obstacles

The Major Hurdles Of High Quality rPET

Consistency

One of the biggest hurdles when it comes to the visual quality of rPET has to do with its consistency. But what factors play a role in the lack of visual consistency of rPET? One of the biggest hurdles is the discoloration: After recycling, most of the time rPET experiences yellowing or other slight discolorations.

Discoloration

Undesirable discoloration of rPET during reprocessing is predominantly caused by remaining trace amounts of components like functional additives, colorants, adhesives, inks and other plastics from caps, labels and sleeves. Multiple heat cycles combined with residual component traces result in a higher level of discoloration. Hence it is key to ensure adequate washing and decontamination of the input material before reprocessing.

Effects

These are by themselves in many cases harmless and do not affect food contact safety but are undesirable due to their negative effect on color. This aesthetic deviation has proven to be unattractive for end-consumers.

Yellowing

This is quite understandable: drinking milk from a somewhat ‘yellowish’ transparent bottle feels strange for consumers who equate this color with a lack of hygiene and find it unattractive. During our interviews both the converters and brand owners seem to agree that a yellowish off-color is not accepted by the average consumer because it is associated with spoilt product.

Other aspects related to rPET quality are Intrinsic Viscosity (IV), absence of black spots
and haze. 

Solutions

Different Solutions To Retain rPET Value 

It is a given that high quality, transparent rPET is scarce and prohibitively expensive to come by. There are several options being worked on to address the problem of limited availability of high quality rPET. Most of these are clearly described in the Design for Recycling Guidelines by the various recycling platforms and associations. A solution that has already been implemented on a wide scale is to use completely clear packaging.

Eliminating color

Eliminating color in packaging will ensure that the value is retained. Reason being that packaging materials are predominantly separated in two recycling streams, I.e. clear and colored. Mixing and reprocessing various colors, even transparent versions, results in a lower quality output. As stated before the discoloration of clear rPET is due to multiple heat cycles in combination with residual component traces.

Closed loops

Another solution has been to use closed loops in the recycling process. For example, large brand owners own a stake in deposit return systems for PET bottles. This helps to ensure the quality of the PET bottles being collected and it allows them to standardize a significant portion of the PET collected for the recycling. This can help in some ways, but inevitably, after multiple heat cycles the same undesirable discoloration issues might arise.

Color neutralization

A technical solution to the undesirable yellowish discoloration is Color Neutralization. Using opposite colorants allows for a wider color range of rPET to be used, which of course means that while the total amount of rPET stays the same, more of the available rPET can now be utilized. 

Method

How Does Color Neutralization Work? 

What Are The Different Product Forms And What Are Their Pros And Cons?

An undesirable color cast can be neutralized by means of adding an opposite colorant in the melt processing step, among others the extrusion and injection molding process. It is comparable to how noise-cancelling headphones neutralize sound coming from outside:

“[…] by using microphones to pick up low-frequency noise and neutralise it before it reaches the ear. The headset generates a sound that’s phase-inverted by 180 degrees to the unwanted noise, resulting in the two sounds cancelling each other out.”

Jessica Furseth, The Guardian

The melt processing step could take place at a recycling facility but also at a (packaging) converter. By addition of the right amount of opposite colorant the rPET will be as close to virgin PET as possible from a coloristic point of view. However depending on the starting value of the input material, the L-value will always be affected.

Options

The different forms

Liquids

These concentrates are available in various product forms, depending on the type of carrier used, liquid or solid. A liquid concentrate allows for a low dosing rate also called let down rate (LDR). It’s easy to control and dispersed effectively in the target plastic. However it might have some stability issues with functional colorants or additives settling out. Furthermore some housekeeping challenges might occur when spilled. 

Solids

A solid concentrate or masterbatch might be based on a wax or polymer and allows for cleaner and easier handling and depending on the type of carrier material either disperses very easily or requires somewhat more melt mixing shear. The colorant, carrier material and LDR of a formulation can be tailored to specific needs. Seeing as there is a trend towards 100% rPET, a wax based solid masterbatch might be preferred.

From a sustainability perspective, a non-petroleum, non-food source based wax based solid masterbatch is an excellent option which helps in the goal towards 100% rPET.

Also regulatory requirements in relation to the end-use have to be considered in the composition of the concentrate or masterbatch. The optimal specific product form depends on several factors like the needs and production setup. 

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