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The global demand for plastic bottles is insatiable and continues to rise each year. The result is an increase in competition between manufacturers of the bottle making machines. Such competition means each brand is trying its level best to deliver to their clients’ expectations.
Bottling and other packaging companies, on the other hand, have a field day because they can reap big from that competition. If you are contemplating starting a small firm that manufactures plastic bottles, then you need to know everything there is about the plastic bottle making machines.
This article will examine some aspects of bottle making for you to have an idea of what makes an excellent machine for making plastic bottles.
Plastic bottles are commonly made from PET (Polyethylene Terephthalate) plastic, a form of polyester that is durable and lightweight. Today, food and beverage, personal care, and pharmaceutical industries prefer PET plastic containers over those made of metal, glass, and other composite materials.
The PET comes as pellets or granules which are fed into the plastic bottle making machines, molten and then injected and blown under pressure into a mold cavity. The resulting plastic bottles are safe, have excellent clarity and structurally robust. They also show high impact and tensile strength, are minimally permeable, are leakage resistant, and are flexible.
How the plastic bottles are made?
Plastic containers are made using a process that involves blowing the molten plastic into a mold cavity. Plastic bottle machine achieves this by employing one of the three blowing methods discussed herein.
1. Stretch Blow Molding
Stretch blowing is the method to use if you want to produce hollow objects like bottles that have biaxial molecular orientation. This kind of orientation provides better physical attributes, gas and moisture barrier properties and clarity. These properties are crucial for bottles used in food and beverage industries such as containers for carbonated drinks.
Stretch blowing uses two unique techniques, namely: one-stage and two-stage techniques. In the one-stage method, the plastic bottle making machine injects preforms into the mold that is conditioned to the appropriate temperature. It then blows the preforms into containers. The whole process takes place in a single step. This technique is unique and helps in specialty tasks, such as making wide-mouthed jars. In the two-stage method, the machine inject-molds the preforms which then enter storage chamber where they wait for 1 to 4 days. A device called reheat-blow (RHB) then blows the preforms into containers. The RHB machine and the molding process is costly making this technique ideal for the production of high volume items like bottles for carbonated drinks.
2. Injection blow molding
Injection blow molding is suitable for smaller plastic bottles. It uses a variety of polymers including PET as well as Low-Density Polyethylene (LDPE), High-Density Polyethylene (HPDE), Polypropylene (PP) and Polyvinyl Chloride (PVC). The process involves inflating a hot, empty parison or thermoplastic preform inside a closed mold so that it takes the shape of that mold cavity. The hot material takes some time in the core pin of the plastic container making machines. It is then indexed to the blow molding station of the device. Here, the melted material is blown into a container and then allowed to cool slowly. This process provides more accurate details in the finish and neck (threaded) areas than the other blowing methods. Only a slight improvement can be expected in the injection blowing method since only little biaxial molecular orientation takes place.
3. Extrusion Blow Molding
This process starts by conservative extrusion of a tube or parison using a die similar to the ones used in manufacturing plastic pipes. The machine then extrudes the parison downwards in between 2-halves of an open blow mold. The mold closes when the parison achieves the right length to catch and hold the neck end open and pinching the base end closed. A blow pin that resembles a rod is inserted via the neck end of the heated parison to inflate it inside the mold cavity and form the threaded opening of the bottle. Once the container cools, the mold snaps open releasing it. Top-quality plastic bottle making machines are designed to trim excess plastic from the pinched-off bottom areas and the neck.
The Assessment Process
Once bottles are ejected and cooled, a rigorous assessment process is necessary to ensure they meet the expected industry standards. The required tests include those for impact resistance, pressure, permeability, and transparency. Any bottles that do not meet any one or combination of these standards are returned for recycling to reduce wastage and minimize the cost of production.
Apart from the laid standards, manufacturers of PET plastic bottles also inspect their end products to ensure they are consistent in terms of shape, size, color and finish. Only bottles that pass the thorough inspection process are packaged for shipping to their final destinations.
Some Qualities of a Good Plastic Bottle Making Machine
Not all plastic bottle making machines are the same in design, performance, capabilities, and price. However, there are some standards that the brand and model you choose to buy for your bottle making firm should have. Here are some of them:
-More Working Hours
The components and design of the machine should guarantee you more working hours than standard machines in the market. High-quality parts and simplified construction are marks longer lifespan as well as the reduced wear-out cost of your machinery.
Starting a plastic bottle making business means you want to make money. It will not make an economic sense if the cost of maintaining the plastic bottle making machine is high. Be careful when buying this machinery. Customer reviews offer you a great way to know what previous users of the device have to say about its cost of maintenance.
High efficiency contributes to the performance and therefore the profitability of the machine in the long run. The best device is one that does not waste any materials, energy or air pressure. Several technical aspects can give you an idea of the efficiency of the bottle making machine you intend to buy.
The machinery you choose should be market-oriented if you must beat the ever-growing competition in the PET bottle manufacturing industry. It should give you the opportunity to add molders to the bottling line in case a more prodigious output is desired. The multiple solutions will result in a better return on investment.
Hopefully, you have learned something concerning plastic bottle making machine. Investing in bottle manufacturing is a good business given the market outlook. PET bottles are used widely in the food and beverage, therapeutic and personal care industry. With the right approach, this niche can be highly profitable. Everything starts with finding the best quality plastic molding machine.