What is a bag heat sealer?

A bag heat sealer is a packing machine used to help form a bag by melting the sides together with heat. Sealing items in packages is essential not only for protecting them and ensuring their safety in transit, but also for packaging. Especially clear plastic bags. To do this, you can use a simple bag heat sealer to close the open end of the bag or even trim off the "spare" section for more professional work.

In this article, we will look at how bag heat closing machines work, the different types of heat closing machines available and what types of bags they are handling. And a heat sealing machine that automates your process.

What is a bag heat sealer?

A plastic bag thermoclosing machine is a simple heater that, when pressurized and applied to a thermoplastic bag, seals the bag together using a combination of pressure and melting. Two plastic parts are placed together and pressed against each other and heated. This melts the plastic, which is then mixed together and condenses into individual plastic joints as it cools.

It is similar to welding but uses plastic. After cooling, the joint is basically a solid piece, or even plastic, adjacent to the rest of the remaining two pieces joined together. In short, it is a watertight seal weld between the two.

It can be used to join two identical or two similar thermoplastics (e.g. different grades of polyethylene) together. It is most commonly found in packaging and can form a water and dust resistant seal on bags of almost any size.

They typically use heated elements or rods, often covered with protective Teflon sleeves to keep the melted plastic from sticking to elements that are pressed onto the plastic at the point where the connection is needed. Sealing takes only a few seconds, but it's a precise process. Too little and the joints won't form, too much and the plastic will burn. Therefore, the function of most heat sealing machines is to light up when the sealing is complete, or in more sophisticated heat sealing machines (as we shall see) to light them up when they are ready.

There are different heat sealing devices available. Small portable/desktop equipment for small batch small batch items; Automated equipment for sealing many individual items; And a continuous heat sealing machine that continuously seals items as they pass through them.

Some also come with cutters so that excess plastic can be simply trimmed away once sealed, or, for continuous sealers, consecutive items can be cut separately once sealed.

That's how they work, but what can they seal?

Can I use a heat sealer on a polythene bag?

You can use a heat sealer on a polythene bag. Most polyethylene bag heat sealers are used to seal polyethylene bags. Polyethylene for heat sealing packaging is available in several forms: it can be supplied in bags, requiring only one end to be sealed; It can also be used as a flat tube, like an open pocket covered with objects, and then needs to be heat sealed at both ends.

Most bags and flat-mouth tubing made from low-density polyethylene are ideal for heat sealing because it melts at around 160°C. It is hot enough to melt the sides together and cool enough to cool and seal quickly after the heat and pressure are removed.

Another benefit is that as it cools, the polyethylene shrinks and pulls the seal tight. This is one of the main advantages of heat sealing machines for plastic bags.

Layflat hoses can be used for packing so that you can continuously pack goods on an industrial scale as needed. It allows users to create packages of the desired size by simply placing the goods inside, cutting the tubes to a certain length, and heating them to seal. This is ideal if the warehouse has items of various sizes that need to be packed.

It also comes in black as well as clear and recyclable polyethylene options, and the black packaging is ideal not only to protect the goods from light during storage or transportation, but also to maintain confidentiality when sending them through the post.

Is there a machine for heat sealing plastic bags?

The machine can be used to heat seal plastic bags. One of the easiest ways to pack and seal goods using flat mouth tubes or plastic bags is to use a bag heat sealer. Thermal closing machines used to seal plastic bags can handle moderate to large quantities of goods, resulting in better, more effective sealing.

Plastic bag thermal closing machines, such as the OPTI-SEAL industrial thermal closing machine, provide simple yet versatile operation with adjustable sealing and cooling times. The compact design of the machines means they can be easily placed within reach of a workstation or mounted on an optional stand that also includes a film stand and a pedal for hands-free operation.

Opti-seal Industrial Heat sealers are pulse sealers, meaning that heat is applied through a single filament for only a few seconds to Seal materials together. Opti-seal has a wide range of applications. It can seal a variety of films including polyethylene, polypropylene and PVC with a 5mm durable seal, making this bag sealer ideal for producing and sealing bags, jute bags and sachet bags. Equipped with safety trimming knife.

Other heat sealers, such as the RAJA pulse sealer, are reliable and ideal for sealing small volume bags. These pulse sealers are also suitable for flat tubes or bags up to 400 mm in width. They are also pulse sealers that apply heat through a single wire for only one second before the mechanism begins to cool the seal.

Most thermal closing machines have an adjustable timer and a cutter located on the sealing arm to provide a neat appearance for bagged products. There are three sizes of heat bonding machines: 200, 300 and 400mm heat bonding widths, resulting in 2mm heat bonding widths. Two layers of polyethylene film (PE film) are recommended, each with a maximum thickness of 150 microns (600 specifications).

There are also plenty of spare Teflon-coated heating elements and cutters to ensure your heat sealer is always in tip-top working condition.