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Heat Sealing Machine

Heat sealing machine, also called hot air welding machine/jointing machine...which is hot air type, through high temperature, fabric can be sealed together tightly. 0 to 650 degree, adjusted according to gsm or thickness of fabric. two types of sealing machine, automatic and multi heating head, the other is semi type with sinlge head. for multi head welidng machine, it is used to joint raw rolls together, overlap welding and edge welding. for exampale, raw roll width 2m, and want to make 10m width in the finall, then need to joint 5 rolls together. the other type is single head welding machine, simple structure and very useful, it is used to joint two sheets together, one machine with two functions, overlap welding, and edge welding with rope insert. for machine, using imported electrical parts, making sure high quality and durable.

What is Heat Sealing Machine

 

A heat sealing machine is a type of sealer which uses heat as a medium of sealing materials. It works by generating a high current impulse to the heater ribbon on surface of the device. This produces a wave of heat strong enough to melt and seal up the bag or sheet pressed between the sealing bars. Heat sealers can be used to join or seal together not just similar materials, but different materials as well as long as they have a thermoplastic layer. Once the sealing bar is heated to enough degrees of temperature, material is melted and joins together like a zip liner bag. This is commonly used to seal bags and even plastic coat different things to preserve them from effects of decay.

Benefits of Heat Sealing Machine

Airtight and Secure Seals

One of the most critical advantages of heat sealing machines is their ability to create airtight, leak-proof seals. This feature is particularly important in the food and pharmaceutical industries, where maintaining product freshness and preserving product integrity is paramount. By safeguarding the products from contamination, heat sealing machines help businesses adhere to stringent safety standards and ensure customer satisfaction.

Material and Energy Efficiency

Heat sealing machines are designed to efficiently use materials, minimising wastage and assisting businesses in aligning with more sustainable practices. In addition, impulse heat sealing machines boast energy efficiency, since they only generate heat during the sealing process, reducing energy consumption.

 

 

 

High-Speed Operation

Heat sealing machines can quickly form secure seals, resulting in faster and more efficient packaging processes. This high-speed operation translates into reduced labour expenses and improved productivity, meeting high-volume production requirements with ease.

Customisable and Versatile

Modern heat sealing machines offer various customisation options, such as adjustable heat settings, pressure levels, and sealing times. This versatility enables businesses to fine-tune their sealing process for optimal results, catering to a wide range of materials and product types.

 

 

 

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Selecting the Right Heat Sealing Machine for Your Business

Type of Heat Sealing Machine

Depending on the materials being sealed and specific production requirements, businesses can opt for a direct heat sealer or an impulse heat sealer. Direct heat sealers are suitable for materials that require continuous heat application, while impulse sealers are better suited for heat-sensitive materials.

Size and Production Capacity

The size of the sealing area and the capacity to handle different product dimensions are crucial factors to consider when selecting a heat sealing machine. Choose a sealer with adequate sealing width and depth for your products and ensure it aligns with your current and future production requirements.

Tarpaulin Roll Welding Machine
Auto Welding Machine

User-Friendliness and Maintenance

A user-friendly heat sealing machine with intuitive controls and easy-to-understand instructions minimises the learning curve and improves productivity. Additionally, consider the ease of maintenance and availability of replacement parts to ensure your machine stays in peak condition with minimal downtime.

Budget and ROI

While the cost of the heat sealing machine is essential, also consider the potential return on investment (ROI) through increased productivity, reduced labour costs, and decreased material wastage. By focusing on long-term value, you can make a wise investment in equipment that positively impacts your business.

What are the different types of Heat Sealers

 

 

Heat sealers are appliances with a heating element that uses an electric current to heat and seal thermoplastic bags to form a sealed unit. The heating bar is pushed down on the thermoplastic material to melt it together and it is during the cooling stage that the seal is formed. Heat sealers can also fuse aluminium foil.


Heat sealers come in different sizes and methods of application. The type of heat sealer you need depends on the product, seal strength and integrity of the seal you require.


Hand sealers are operated by pushing the sealing bar down by hand. As the bar is lifted the heat switches off to allow the seal to cool and firm up. A foot sealer is a heat sealer on a stand and uses a foot pedal to push the heating bars down. Hood shrink machines apply heat and shrink the plastic bag around the contents in a heat chamber. Gas heat guns apply heat to shrink a tight thermoplastic layer around an object.


You can choose from a range of heat sealers, with or without a cutting apparatus, and either hand or foot operated. A cutting apparatus is a sliding blade that cuts off excess packaging and is useful for cutting poly tubing to form an individual bagged unit.


Heat sealers are used by different industries. They are an excellent application for the food industry, keeping packaged food airtight and fresh, prolonging the shelf life. The pharmaceutical and medical industry also use heat sealing equipment to keep dressings, medication and surgical implements sterile. Retail stores such as newsagents, lolly shops or small home-based businesses use heat sealers to protect goods from dust, moisture and handling.

 

Impulse Heat Sealers
Impulse heat sealers only apply heat when the heating jaws are pushed down onto the area to be sealed and the set time is reached. This type of heat sealing is usually used for fusing thermoplastic materials that don't need high temperatures to form a seal. Impulse heat seals multi-layered thermoplastic and foil tubing to form a moisture barrier and airtight pouches. These are the safest heat sealers as the element is only hot when the heating jaws are closed. Burns are more likely to be avoided.
Impulse heat sealers are more economical to use as the power usage is intermittent and the sealing jaws are heated instantly, rather than requiring time to heat up.

 

Constant Heat Sealers
Constant heat sealers provide a high continuous heat in the sealing jaws. The temperature is more controlled in these types of heat sealers. Thermoplastic or poly-coated materials that are suited for constant heat need to be thicker and able to handle high temperatures without becoming weak or melting.

 

Constant Heat Roller Sealers
Seals Polyethylene or Cellophane by rolling the Teflon coated wheel along the material to be sealed. These portable sealers can make a round oval or square textured seal and are easy to use. Has an adjustable temperature range from 30-220 degrees. Is ideal for sealing plastic bags.

 

Band Sealers
Band Sealers come with a conveyor belt for a faster packing operation. These machines often have accessories such as an alphanumerical embossing wheel. Temperature controls let you set the heat levels and wider conveyor belts can be installed.

 

Hood Shrink Sealers
Hood Shrink Machines apply heat to shrink a plastic film around a product in one step. Hood shrink machines cover the item and then send it through a heat tunnel or oven to shrink the wrap.
This process is often done by automated equipment, but semi-automatic and manual shrink wrap machines are also available. The shrink and cooling times are programmable according to the items and shrink material being used.

 

Shrink-a-pack
A heat machine that shrinkwraps packages with the included heat gun and a film dispenser attached. This heat sealer is good for fresh produce and odd-shaped items such as hampers. For use on PVC, polypropylene or polyolefin shrink film. Great for small businesses and retailers such as chemists or newsagents who need to bundle items.
This heat sealer is also good for covering Christmas hampers, perishables and non-perishables.

 

Automatic heat Sealers
Automatic Impulse Heat Sealers are designed for the continuous sealing of thermoplastic films such as polyethylene and polypropylene. Once the correct control settings have been programmed, consistent seals are maintained automatically, making each seal consistent.
A Constant Automatic Heat Sealer is excellent for sealing poly cello films, humidity-proof cellophane film, polyethylene film, aluminium foil coated bags and gusset bags. Pacmasta offers mesh or straight-line texture of heater jaw. The straight-line texture is especially recommended for the health care industry.

 

Gas Shrink Gun
Gas Shrink Guns are used with shrink polythene pallet covers, pallet bags, polythene sheeting, shrink films. Its a fast, cost-effective and highly protective method of dispatching goods.

 

Seal Strength
Seal strength relies on the joining strength required for the object being packaged. Seal integrity relies on the level of minute breaks in the seal or tiny missed areas of seal that microbes can travel through and contaminate goods. Seal integrity is paramount for the medical and pharmaceutical industry. For proper sealing of goods, it is very important to factor in the materials, heat seal times and the requirements of individual items.
The element in a heat sealer will eventually burn out. Luckily they are easy to replace with readily available spare parts and repair kits.

 
Why Use a Heat Sealing Machine for Food Packaging

Heat sealing technology has permeated various industries, from large-scale food production to small-scale retail packaging. Its versatility and efficiency have made it a staple in the packaging landscape, revolutionising the way we handle and store food products.

 

Here's a list of reasons why it is used within food packaging.

 

Extended Shelf Life
Heat sealing creates an airtight barrier around food, preventing the entry of oxygen, moisture, and microorganisms that contribute to spoilage. This hermetic seal significantly delays the degradation of food, extending its shelf life and reducing waste.

 

Maintains Nutritional Value
The sealed packaging protects food from oxidation, which can cause nutrient loss. By preserving the nutritional integrity of food, heat sealing ensures that consumers receive the maximum benefits of their meals.

 

Preserves Sensory Appeal
Heat sealing helps maintain the colour, texture, and flavour of food, keeping it visually appealing and enjoyable to consume. This preservation enhances the consumer satisfaction when consuming the product.

 

Improves Food Safety
By eliminating the risk of contamination from external elements, heat sealing contributes to food safety. This is particularly important for delicate products like fresh produce and prepared meals.

 

Minimises Packaging Waste
Heat sealing produces durable, tamper-evident packaging that is less prone to tearing or opening. This reduces the risk of product contamination and minimises packaging waste, which in turn promotes sustainability.

 

Versatile Packaging Solutions
Heat sealing can be used to create a wide range of packaging formats, from clamshells and pouches to trays and retort pouches. This versatility caters to various food products and storage needs.

 

Resealable Packaging
A heat sealing machine can also be used to produce resealable packaging, allowing consumers to easily store and reseal opened food items. This convenience promotes waste reduction and enhances consumer satisfaction.

The use of heat sealing machines in food packaging offers a multitude of benefits that extend far beyond mere convenience. This technology plays a pivotal role in preserving the quality, safety, and nutritional value of food products.

 

What Are The Limitations of a Heat Sealing Machine
Heat sealing machines, while highly beneficial in many aspects of packaging, do have certain limitations. Understanding these limitations is important for deciding whether or not to incorporate the technology into your operation.

Here are some of the key limitations:

 

Material Restrictions
Heat sealing is typically limited to materials that are heat-sealable, such as certain plastics and thermoplastics. Materials that cannot withstand the heat or do not bond well under pressure are not suitable for this method.

 

Energy Consumption
Heat sealers, especially industrial-scale models, can consume a significant amount of electricity. This can lead to higher operational costs and a larger carbon footprint.

 

Maintenance and Downtime
Regular maintenance is required to keep heat sealing machines in optimal condition. Over time, elements like the heating bar may wear out and need replacement. Failure to maintain the equipment can lead to downtime and reduced efficiency.

 

Precision Requirements
Properly operating a heat sealing machine often requires a lot of training and practice. In order to achieve a perfect seal, you need precise control of temperature, pressure, and dwell time. Inconsistencies in these parameters can lead to weak seals or damaged packaging.

How to use a Heat Sealer

 

Set the timer: The first thing that you need to do when using your heat sealer is to plug in the power cord. After plugging in, set your timing dial to about 2 1/2. This timing is considered a good starting point.
You can adjust the timer to the lowest setting if you want to seal and cut. Cut and seal is where you remove any excess plastic from the bag compared to simply sealing the bag and leaving the flap above the seal.

 

Place the opening side of your bag on the sealer: Now that your sealer is all set, you can start filling the bag. Once you're done with inserting the contents, place the open end of the bag on your sealing pad.
Make sure to wait until the indicator light of your heat sealer is off. You can wait a few seconds more, just so that the seal is made properly.

 

Bring your sealing arm down: If your only objective is sealing then bring the sealing arm down on the bag and sealing pad. Don't press the arm hard.
Make sure to keep the sealing arm down until the red light turns off. For better sealing, avoid lifting the arm even after 2-4 seconds.

 

Cut and seal: If you plan on cutting the excess plastic after your seal is made, you can use your right hand to tear away the bag you sealed.

 

Elevate the seal arm: The process of sealing the bag completes just after you take the sealing arm away from the bag. The cut and seal bag that you wished for will not have any bagged material above the seal.

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Why Is My Heat Sealer Not Working

 

 

One of the main issues why a heat sealer is not working as it should be is because it is producing a poor seal. Before we look at the solution to this issue, we need to understand the basic elements of sealing.
To create a good seal, you need to have three key ingredients: the right speed, the right temperature and the right force. If any one or more of these is out of sync, then the result is a poor seal. Let's look at each of these elements in more detail:

 

The Speed Is Too Slow/fast
Most rotary heat sealers have a fixed speed of 10 metres per minute. This is considered the best speed for a good seal. If it is faster than this, then the pouch may not seal properly. If it is slower than this, it will melt the plastic part of the pouch or burn the paper backing and again produce a poor seal. Some models of heat sealer allow you to adjust the speed that the pouch is pulled through. The speed should be adjusted if you think the speed is too slow or too fast.

 

The Force Applied To The Pouch Is Too Weak/strong
If the amount of force, or pressure being pushed down on the pouch is not enough, then the pouch will not seal properly. Furthermore, if the force is too great, then the pouch will get stuck or jammed in the heat sealer. Every rotary heat sealer will have a pressure wheel which should be adjusted properly.
In addition to this, sometimes if a heat sealer uses a synthetic/rubber pressure roller and it hasn't been used for a long time, the pressure wheel can develop a flat spot. The irregular shape of the pressure wheel leads to gaps in the seal at regular intervals. This is why it is always good practice to ensure that any backup heat sealer is not left on the shelf for too long. Alternatively, you can buy a heat sealer

 

The Temperature Is Too High/low
One of the most common reasons a pouch is not sealing properly is because the temperature is not set correctly. Too hot and the film will melt and the paper will burn. Too cool and the seal will easily pull apart.
Every pouch will have an optimum sealing temperature. You should check with your pouch manufacturer to see what this is before you try to seal any pouches. As a general rule, standard paper/film pouches seal between 175°C and 200°C.

 
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FAQ

Q: How Does a Heat Sealer Work?

A: While every heat sealer has a different look, feel, and function, they all tend to work in the same fundamental way.
With a direct power source, the heating elements are brought up to the desired temperature, which can take several minutes to an hour, depending on the size of the machine.
From there, thermoplastics are organized in the desired configuration and placed into the machine at the proper angle to form a seal.
The heating elements are then manually clamped down with the desired amount of pressure, which, in combination with heat, welds the two material components together as they are moved in tandem through the machine.
Operators can then cut the material at the intended endpoint to achieve the exact shape as specified in the product description.

Q: What Are the Different Types of Heat Sealers & Why Does It Matter?

A: The most common type of heat sealer is a mid-size tabletop sealer with an average rate of 15 ppm. These are used in smaller operations and allow producers to accurately form seals in a safe, efficient manner without taking up too much space or power.
Larger horizontal band sealers require more room and power, but can perform at more than twice the rate of tabletop machines.
On the smaller end of the spectrum are portable handheld sealers, which tend to produce in the 10 PPM range and may not offer the same level of consistency and accuracy.

Q: What Is the Difference Between an Impulse Sealer and a Heat Sealer?

A: While direct heat sealers take time to warm up and remain hot for the entire duration of the sealing process, impulse sealers only use electricity when the unit is applying a seal.
This makes for a more economical and safe sealing process, but certain materials cannot be sealed effectively with impulse sealers due to their reduced energy output.

Q: What Is the Heat-Sealing Process?

A: Every machine has different instructions and unique options and settings depending on how the device is engineered.
But no matter the size or scope of the heat sealing project, the process follows the same general steps. As always, manufacturers must use best practices to ensure optimal, consistent product outcomes.

Q: Can You Use an Iron Instead of a Heat Sealer?

A: An everyday iron may be hot, but it's no substitute for a specialized direct heat sealer. Irons are too wide, too unwieldy, and difficult to control when creating precise and even seals.
Thankfully, heat sealers can be obtained without spending a fortune, or companies can procure packaging products from trusted producers with the best equipment available.

Q: Is a Heat Sealer the Same as a Vacuum Sealer?

A: Heat sealers and vacuum sealer machines are both commonly used to seal plastic bags, but heat sealers only use heat to seal the ends of a bag, while a vacuum sealer removes air from the bag before applying the heat seal. Vacuum sealing is preferred for perishable items such as food, as the absence of oxygen extends a consumable product's shelf life.

Q: What Is the Difference Between Impulse and Constant Heat Sealers?

A: The main difference between impulse heat sealers and constant heat sealers is in the heating process. While both heat sealers operate using electricity, impulse heat sealers use only a brief pulse to provide heat for a few seconds. Constant heat sealers, however, provide a continued source of heat. While constant heat sealers pose a potentially greater risk to the user through the continuous heat source, they also provide a higher level of overall heat for helping to fuse higher grades of polymer thickness with higher melting points. Impulse sealers are more commonly used to seal at lower production levels and often lighter materials.

Q: Are Heat Sealers Safe?

A: Hand heat sealers and sealer machines are safe when used carefully and with training. Sealer machines heat up quickly when set to high temperatures and should never be handled around exposed skin or left running unoccupied.

Q: Can a heat sealing machine be used for both manual and automated operations?

A: Yes, heat sealing machines are available in both manual and automated versions. Manual machines require the operator to manually place the materials and initiate the sealing process, while automated machines can handle continuous sealing operations with minimal human intervention.

Q: How Long Does it Take to Heat Seal a Product?

A: It is determined by the thickness and type of material used, but will often take less than two seconds to fully seal.

Q: Does the heat sealer need to be the size of my product?

A: If using a bar sealer, the sealing bar should be larger than the product being wrapped. A complete seal will not be reached if the bar is shorter than the product.

Q: How often do heat sealer parts need to be replaced?

A: When stacking pallets before transit, it's important to make sure all items are stacked evenly with balanced surface area distribution. Poor stacked pallets are harder to store and more likely to break during transit, leading to higher carrying and replacement costs for damaged products.

Q: What safety precautions should be taken when using a heat sealing machine?

A: To ensure safe operation, it is important to:
Follow the manufacturer's instructions and guidelines.
Use appropriate personal protective equipment, such as heat-resistant gloves.
Keep hands and other body parts away from the sealing area during operation.
Allow the machine to cool down before performing any maintenance or adjustments.
Regularly inspect and maintain the machine to prevent any potential hazards.
Can a heat sealing machine be used for both small-scale and large-scale production? Yes, heat sealing machines are available in various sizes and capacities to accommodate different production scales. From small tabletop models suitable for low-volume production to large industrial machines capable of high-speed sealing, there are options available for all production requirements.

Q: Are heat sealing machines suitable for sealing liquids or powders?

A: Yes, heat sealing machines can be used to seal packages containing liquids or powders. However, special considerations need to be taken, such as using appropriate packaging materials and ensuring proper sealing techniques to prevent leakage or contamination.

Q: Can a heat sealing machine be used for printing or labeling?

A: While heat sealing machines primarily focus on sealing materials, some models may have additional features for printing or labeling. These machines can incorporate printing mechanisms or label applicators to add information or branding onto the sealed packages.

Q: What maintenance is required for a heat sealing machine?

A: Regular maintenance is essential to ensure the longevity and optimal performance of a heat sealing machine. This may include cleaning the machine, inspecting and replacing worn-out parts, lubricating moving components, and calibrating temperature and pressure settings as needed.

Q: How can the sealing quality be ensured with a heat sealing machine?

A: To ensure high-quality seals, it is important to:
Set the appropriate temperature and sealing time based on the material being sealed.
Ensure consistent pressure is applied during the sealing process.
Regularly inspect and maintain the machine to prevent any issues that may affect the sealing quality.
Perform periodic quality checks on sealed packages to verify the integrity of the seals.
Can a heat sealing machine be used for sealing irregularly shaped packages Yes, heat sealing machines can be used to seal irregularly shaped packages. Some machines offer adjustable sealing widths or have specialized attachments to accommodate different package shapes and sizes.

Q: Why do my heat sealer pouches keep getting jammed?

A: If you are using your heat sealer heavily, it is likely that dirt and grime will build up between the transport bars. Indeed, ripped, or broken pouches can get caught in the transport bars or printer area and clog the system up. Having your heat sealer serviced every year will eliminate dirt and foreign objects from building up.
However, problems with jamming can still occur even with very clean and well-maintained devices. This is because the heater bars can drop down over time due to the constant process of heating and cooling. When the heater bars drop, this can snag the pouch when it passes through.

Q: Why does my heat sealer keep shutting down?

A: Most heat sealers have a thermal cut out to protect the device from overheating. Instruments will have a temperature tolerance of +/- 5°C than what your temperature set point is. This is a standard feature across most manufacturers.
If you find your heat sealer keeps shutting down, it may be a temperature control issue. This would mean a qualified service engineer will need to attend to it in order to rectify the fault.

Q: What Temperature Is a Heat Sealer?

A: Heat sealing is used for welding together two layers of thermoplastic, usually as a seal in a thermoplastic bag. Thermoplastics are heat reactive and tend to melt and seal at roughly 140 degrees Fahrenheit, which means a heat seal must press together two layers at this temperature to seal them properly.

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