As an e-commerce business owner, you know that poly mailers are a huge help every single day. They are not only affordable and lightweight, but they can also withstand practically any weather. A poly mailer will ensure that an order stays dry and safe for longer lengths of time for forgetful customers to pick up their items in a timely manner. Poly mailers come in a variety of sizes and forms, so you may find the ideal fit for whatever it is you’re mailing. They also offer secure transportation without the weight of a box. They are also simple to store! herefore the ideal poly mailer is your best option if you’re seeking for a quick and easy approach to distribute goods or commodities.
But have you ever stopped to have a good look at the beautiful plastic envelops and consider more about it? What materials are they made with? Are they good for the environment? How do these helpful products come into being? It’s time to take a look backstage and learn about the raw materials and production process behind the scenes!
1. What are poly mailers?
No matter you are an e-commerce business owner or an avid online shopper, you are no stranger to poly mailer and most likely can’t live without it every day. Poly mailer, also known as mailer envelops or poly mailer bags, are widely used in the logistics industry as packaging bags for documents, papers, various daily necessities, goods, etc. Poly mailers have advantages of good waterproof protection and cost-effectiveness. With their self-sealing strip design, they also provide easy assembly that saves you both time and labor costs.
2. What materials are poly mailers made with?
Poly mailers are made from polyethylene, a kind of durable plastic-based material, offering secure protection for items during transit to their destination. There are basically two types of polyethylene, LDPE (low-density polyethylene) and HDPE (high-density polyethylene).
HDPE and LDPE both have their different benefits. But simply put, the biggest difference between them is the density. The density of HDPE is much higher than LDPE. Poly mailers made from HDPE are non-toxic and relatively fragile, and the sound is relatively louder when you pinch it. It also has an incredibly hard texture, which makes it more durable, more resistant to punctures or tears. It is able to withstand higher pressures, and has a higher melting point than its counterparts. However, this increased durability makes it less flexible compared to LDPE.
The density of LDPE is lower than HDPE. With a low melting point, LDPE is non-toxic, soft, not easily torn, and has high transparency. All these features make it incredibly flexible. It also has a soft sound and feel when you pinch it.
3. Are poly mailers eco friendly?
The answer is yes! Though the recycling process is not as simple, poly mailers are still an environmentally-friendly solution. A simple and accessible way is by visiting your local recycling center or grocery store which often includes a collection point for plastic sacks and poly mailers.
For the sake of environmental protection and to avoid waste, there are many countries that advocate adding a certain percentage of recycled material in the production of poly products. Recycled polyester offers almost the same quality as virgin materials but with a significant energy savings. In 2017, research conducted by Switzerland’s Federal Office for Environment found production of recycled polyester used 59% less energy than its virgin counterpart.
At Package N’ Go, we are dedicated to promoting green packaging practices. In the interest of environmental sustainability for future generations, our team is committed to reducing waste by avoiding producing poly mailers with 100% virgin materials wherever possible. We understand that it takes every effort from all of us to protect and preserve our planet!
4. How are poly mailer made?
Now you know what materials the poly mailers are made with. Let’s talk about how they come to our hands as beautiful plastic envelops from the insignificant small plastic particles. I’ll lead you around the production line.
The production process of ordinary poly mailers basically have four sections, blending, film blowing, printing, and bag making.
The blending process is the key to the production of poly mailer. Different countries have different environmental standards, and customers have their own requirements and preferences, which need to be implemented in the blending process. For this reason, it is important to use a mixer to add the required raw materials (master batches as well as new and recycled plastic pellets, etc.) in the right proportions and to mix them well. Only through careful and professional handling can we produce first-class products and win the approval of our customers.
➼ Film Blowing
Film blowing is a plastic processing method that refers to heating and melting plastic particles and then blowing them into a film. It firstly extrudes polymer into a tubular film blank, then blows the tubular film to the required thickness by high-pressure air in a good melt flow state, and then after a process of cooling and shaping, the film is made. The film blowing machine plays a vital role in the film blowing process. The film produced by a professional and advanced film blowing machine is suitable for a variety of high-grade film packagings. And this kind of film can be widely used for both light and heavy packaging products because of its good barrier, freshness, moisture-proof, frost-proof, oxygen barrier and oil resistance. If the film produced is in low quality, it’s either because a non-professional film blowing machine is used or the operation specifications and procedures were not strictly followed.
The poly mailers we use is usually laminated by three layers of film, and such a film is called three layers co-extruded film. Compared to many goods in the market today, this kind of film has advantages of good transparency, good puncture resistance, suitable coefficient of friction, good laminating properties and excellent heat adhesion and anti-pollution heat sealing properties. The inner layer of poly mailer is usually black or gray to promote confidentiality during transportation and the outer layer is light gray, but of course you can design and customize it according to your requirements.
Poly mailer bags are usually printed using a gravure press. First, an etched plate with the desired design or text is printed on a copper plate by means of a gravure printing technique. This specialized technique ensures that the ink is used only on the designed area and not on any unwanted parts, so that blurring and smudging do not occur. The plate with ink attached and the three layers co-extruded film are fully extruded to complete the printing.
As a customer, you can personalize your poly mailer with patterns and texts. You can choose either full-plate printing or partial printing, and the colors can be single or multi-colors. But of course, only experienced printers and advanced high-precision presses can fulfill such printing needs with high quality. Due to the flexibility of the polystyrene material, if substandard machines are used or the workers are lack of experience of operation, it is likely to lead to uneven printing or overprinting etc. which could influence on the printing results.
➼ Bag Making
After checking the printings, we will enter the last step of the production line of the poly mailer bag – bag cutting and bag making. In this step, three layers co-extruded film is firstly laminated with the hot melt adhesive, and then it’s cut and heat sealed precisely by the knife head of the bag making machine. Now the poly mailer enelope is produced. Qualified hot melt adhesive has the characteristics of good initial adhesion, strong holding force, oil seepage resistance, etc. Once bonded, it can not be torn, so as to achieve the anti-counterfeiting and anti-theft function of the poly mailer. Therefore, the choice of hot melt adhesive in the bag making process is also very critical.
With a detailed understanding of the raw materials and production process of the poly mailer, we are sure this will help you in the selection and purchase of packaging products.
5. Package N’ Go, the poly mailer expert
Package N’ Go Productions offers a range of services to help businesses maximize the potential of their e-commerce platform. Our extensive global network enables us to provide our clients with cutting edge solutions for custom packaging, fulfillment and distribution needs around the world. We strive to support companies in realizing their ideas through interactive package design processes that are highly effective yet eco-friendly.
Make sure you explore our extensive selection of shipping solutions so that your products arrive safely and securely. Plus, don’t forget to take advantage of our industry-leading expertise – we’re here to help if you need advice on packaging or personalization options.