Jul. 21, 2025
It’s no secret that the flexible packaging market is growing and growing fast. Many consumers and packagers are turning to flexible packaging because of its light weight, convenient features, and endless customization options.
But as you create your next custom mylar bag or pouch, you need to decide whether you’ll use cold seal or heat seal adhesives.
In this post, we answer the questions: what are they, how are they different, and which should you choose?
Cold seal and heat seal adhesive coatings are both used in a variety of flexible packaging applications. They each have advantages and disadvantages and work best for specific product needs. Do you know the difference between the two and which works best for your application? Read on to find out.
Choosing the right adhesive coating for your product depends on a number of variables, primarily the specific needs and requirements of the item, such as machine speed and capacity, barrier properties, and seal strength.
Heat sealing is the most widely used package sealing technology, and is the preferred choice when a high-integrity seal is needed. Heat seal packaging consists of a multi-layered film including an outer layer, core layer, and interior sealant layer.
Heat seal packaging doesn’t require any special processes or materials (such as pressure-sensitive adhesives). Therefore it’s the more economical choice.
Available in a wide range of laminations, heat seal films also offer a wider variety of performance characteristics over cold seal films. For example, better barrier properties keep oxygen, light, and other environmental elements out of the package (and away from your product).
You can also create a tamper-evident seal to ensure your product’s integrity.
During production you need to carefully manage the following three factors to ensure an effective heat seal:
These factors work together to create the seal and must be in balance to do so effectively.
Heat sealing can be used in many food and beverage applications, and for pouches and bags in all shapes and sizes.
Cold seal packaging is also used in many industries and is preferred for temperature- sensitive products such as chocolate, other confectionery items, and ice cream, as well as medical packaging. It requires only pressure, no heat.
The process involves two films, one reverse-printed with the brand owner’s package design, and a second that provides the barrier to protect the product.
Cold seal adhesives are unique in that they seal only to themselves. For example, when a substrate coated with a cold seal adhesive comes into contact with another substrate coated with the same cold seal adhesive, the two are bonded together through pressure, not heat.
Cold sealing is sometimes referred to as “self-seal”. Packagers using cold seal adhesives can choose the bond strength – from low to high – depending on application and packaging specifications.
But the most notable advantage of cold seal technology is speed. The cold seal process can be up to 10 times faster than heat sealing.
Why? Because production lines don’t have to wait for machines to heat up, as with heat sealing. Additionally, the absence of heat eliminates burn injuries, which leads to a safer working environment.
But there is a downside to the cold seal: the lack of chemical resistance and other properties often required by the FDA, depending on the type of product being packaged.
Cold seal adhesives are also sensitive to air contact and require a suitable release surface.
As you have read, both cold seal and heat seal have their advantages and disadvantages. Each one works best for specific applications. As you seek to find the right sealing process for your product, keep in mind that when you partner with ePac, we can help you determine the right materials and seal for your specific flexible package. Call us today to get started.
In this article, we will introduce three types of pre-made bag packaging machines: the Rotary Pre-Made Bag Packing Machine, the Multi-Station Horizontal Pre-Made Bag Packing Machine, and the Single-Station Horizontal Pre-Made Bag Packing Machine. After reading this article, you will have a deeper understanding of the different types of pre-made bag packaging machines. If you are in the process of selecting a packaging machine, this article will be helpful to you.
For more information, please visit Renhe.
First, in terms of floor space, the single-station horizontal pre-made bag packing machine takes up the least space, followed by the multi-station horizontal pre-made bag packing machine, and the rotary pre-made bag packing machine takes up the most space.
In terms of weight, the smallest is the single-station horizontal pre-made bag packing machine. The heaviest is the rotary pre-made bag packing machine, weighing between -kg. The multi-station horizontal pre-made bag packing machine is in the middle, weighing between 600-kg. If you need to consider shipping costs, this is a useful reference.
Secondly, from the appearance, all three types of pre-made bag packaging machines have a controllable PLC screen on the left or right side. The single-station horizontal pre-made bag packing machine has only one station. The multi-station horizontal pre-made bag packing machine has multiple stations arranged in a straight line. The rotary pre-made bag packing machine has stations arranged in a circular layout.
In terms of speed, both the multi-station horizontal pre-made bag packing machine and the rotary pre-made bag packing machine perform well.
The multi-station horizontal pre-made bag packing machine has a capacity of 10-55 bags per minute, depending on the products and weight per bag.
The rotary pre-made bag packing machine can reach speeds of 10-40 bags per minute, depending on the weight per bag and the products.
The single-station horizontal pre-made bag packing machine is slower, with a speed of 1-15 bags per minute, depending on the weight per bag and the products.
If you are aiming for high production efficiency and have a sufficient budget, the multi-station horizontal pre-made bag packing machine and the rotary pre-made bag packing machine are excellent choices. If you are not too concerned about speed and want to choose a packaging machine within a limited budget, then I recommend the single-station horizontal pre-made bag packing machine.
When you choose a suitable packaging bag size for your product, you need to match it with the corresponding machine model. The Chinese have a saying that it is better to buy big than small, but this is not the case with packaging machines. Each model of the machine can be adjusted within a certain range. You need to choose according to your needs. Below we can introduce you to the size ranges of these three prefabricated bag packaging machines.
In terms of the bag sizes that can be packaged, the multi-station horizontal pre-made bag packing machine offers different ranges depending on the model:
For the rotary pre-made bag packing machine (D-200W), the bag size range is W80-200mm, L100-350mm.Film property and types：Heat aborsobtion film ,such as BOPP. CPP. PTT,etc.
The single-station horizontal pre-made bag packing machine (D-120) has a bag size range of W120-300mm, L130-300mm (can be enlarged to pack bags with a maximum width of 350mm).
The single-station horizontal pre-made bag packing machine Packaging Type: Bags, Pouch, Stand-up Pouch, premade 3 side seal pouch with zip or no zip, gusset, box or sprout.Packaging Material: Paper, Plastic.
rotary pre-made bag packing machine and multi-station horizontal pre-made bag packing machine:premade 3 /4 side seal pouch、 Stand-up Pouch,pouch with zip or no zip, Stand-up Pouchwith zip or no zip，back sealed bag，Back-sealed accordion bag, side-sealed three-dimensional bag, eight-side sealed, eight-side sealed zipper bag, gusseted bag, special-shaped bag, stand-up bag with spout
From a functional perspective, both the rotary pre-made bag packing machine and the multi-station horizontal pre-made bag packing machine have more stations compared to the single-station machine, enabling them to perform more tasks simultaneously.
The rotary pre-made bag packing machine features eight stations, each with a specific function:
Additional Features:
The multi-station horizontal pre-made bag packing machine also has multiple stations arranged in a straight line, enabling efficient packaging processes. However, the specific functions of each station can vary depending on the model and configuration.
The single-station horizontal pre-made bag packing machine can also complete the above packaging processes, but it needs to perform all the actions at a single station, so the speed is slower.
Regarding the equipment with multiple weighing equipment, the single-station horizontal pre-made bag packing machine does not have enough space to put both weighing equipment on its top. We suggest using two movable platforms to support each weighing equipment, switching to the top of the machine as needed.
Models of the multi-station horizontal pre-made bag packing machine above D-200 have enough space to place two different weighing equipment on top, which means you can dispense two different materials into the same bag ,or place the same material in both weighing equipment to speed up the dispensing process.
The rotary pre-made bag packing machine also has enough space to put two weighing equipment on its top.
Want more information on three side seal pouch(th,es,it)? Feel free to contact us.
If you are interested in sending in a Guest Blogger Submission,welcome to write for us!
All Comments ( 0 )