Depending upon the type of job you wish to do, the industry you work in and your specific requirements – for example, the length and width of a bag seal that you require – you will likely require certain type of heat sealing machine to perform the task for you. There are a huge number of different heat sealers on the market today, but before we briefly discuss the types available, let’s consider what they are and what they do for their users.
A heat sealer is a machine that is designed to seal products in thermoplastic bags and pouches such as polyethylene (PE, HDPE, LLDPE), PVC and Polyethylene Terephthalate (PT). These machines are widely used in many industries for packaging food, pharmaceutical products, hardware materials and many other products and materials in thermoplastic bags – for both public and private sector use as well as within the home on occasion. The main purpose of heat sealing equipment is to provide an air and water tight seal, to be tamper proof and also to produce hygienic closure. It is worth remembering, as discussed, that one bag sealer will not necessarily fit all jobs.
There are two main components to look for when purchasing a heat sealer. First, make sure the machine is made of sturdy metal construction, as this is vital – especially when using the equipment on a regular basis. When purchasing a heat sealing machine, ensure that the equipment has an internal transformer that is made of copper. This is essential to promote durability and to ensure that the bag sealer is long lasting.
Although there are many different types of bag sealers available on the market, the two main types are Constant – which is also known as hot bar sealer – and Impulse. Impulse heat sealers are the most widely used due to their low cost, low maintenance and low electricity consumption. However, let’s have a closer look at each of these heat sealing machines to see the benefits of using either.
Impulse heat sealers have one or two resistive Ni-Chrome heating elements which are covered by a strip of Teflon fabric to prevent the plastic material sticking to the bag sealer itself. The heating elements are not heated constantly; rather, they are heated by a timed impulse of heat that is generated by the flow of current produced by the internal transformer, hence the ‘Impulse’ in the name. A combination of heat generated as per the timer control and pressure applied gives a perfect air and water tight seal. Impulse heat sealer spares are relatively cheaper compared to other types on the market.
Constant heat sealers are also known as ‘Hot Bar’ or ‘Direct’. This type of bag sealer uses one or more heated bars to maintain a constant pre-set temperature. The heater bars are heated at all times at a very high temperature and therefore extra safety precautions are required. However, while constant and Impulse are the most widely used forms of bag sealer on the market, there are other tools available to you to help providing a long-lasting, hygienic and effective seal.
Band, or Continuous heat sealer shave a moving belt to drive the bag towards a hot wheel which is continuously heated at a high pre-set temperature. Induction sealing or welding machines utilise contactless technology. Examples of induction sealing can be found on the inner seals of coffee jars and also bottle caps.
All in all, there are a whole host of different types of heat sealers available on the market today – from Constant and Impulse to Hot Bar, Induction, Pedal and Shrink Wrap sealing machines, no two bag sealers are truly the same – and if you are in the market for an impulse sealer or otherwise to help seal and contain your bags for home or business use, Spirepacks have a range of heat sealing machines to help inspire you.
February 1st, 2016
Posted In: Heat Sealers