With the development of the times and the pursuit of personalisation and humanisation, plastic water bottles are gradually becoming popular with many people due to their versatile shape, bright colours and broken-resistant.
Plastic water bottles have evolved from disposable plastic cups to eco-friendly plastic water bottles today. Meanwhile, a wide variety of plastic water bottles have appeared in our lives. During this period, the shape of plastic water bottles has also changed from a monotonous shape to a distinctive and beautiful shape, reflecting the combination of craftsmanship and art. In addition to its basic use function, the elements needed to take into account in the plastic water bottles production include health, non-toxicity and aesthetics. In this article, we are going to explore and explain the plastic water bottle manufacturing process.
Production process of plastic water bottles
Bottle body: material preparation → mould replacement → feed in material → injection moulding of bottle blanks → heating and softening of bottle blanks → blowing of bottle blanks into blow moulds → dust removal by air gun → bagging for spare (use another fully automatic machine)
Lid: material preparation → mould replacement → feed in material → injection moulding of various parts → surface treatment for trimming → assembly
Surface treatment of bulk plastic water bottles
Basic procedure: making screen plate → adjusting ink printing
Silk-screen printing has many features. The most fundamental of which is the high adaptability of the print. It is possible to print on all different materials and substrates with different surface shapes and is not limited by the size of the printed area. This is why it is also called the universal printing method.
Silk-screen printing is a process in which the ink leaks through some of the mesh holes of the screen and is printed on the substrate, while the rest of the mesh holes of the screen are blocked so that the ink cannot penetrate.
When the ink is poured on the screen, the ink does not leak through the screen holes to the substrate without external force, but when the scraper is scraped with a certain pressure and inclination angle, it is transferred to the substrate below through the screen to achieve the reproduction of the image.Alignment silk-screen printing requires screwing the lid first to confirm the position. Silk-screen printing is often used for simple logos of 1~2 colours, but the large curvature is difficult to print.
Heat transfer pringting
Basic procedure: making plate → making film → printing on the machine
Both flat and curved surfaces can be printed.Heat transfer printing is a new printing process, introduced from abroad more than 10 years. The process of printing is divided into two major parts: transfer film printing and transfer processing.
Transfer film printing uses dot printing (resolution up to 300dpi). With the pattern pre-printed on the surface of the film, the printed pattern is rich in layers, bright colours, varied, small colour difference, good reproducibility, which can achieve the effect of the design pattern requirements, and suitable for mass production.
The transfer process is carried out by a heat transfer machine (heating and pressure), which transfers the beautiful patterns on the film to the surface of the product, and the ink layer dissolves into one with the product surface after forming, which is realistic and beautiful and greatly improves the grade of the product. Heat transfer printing is a technique of printing patterns or designs onto heat resistant adhesive paper and, through heating and pressure, printing the pattern of the ink layer onto the finished material.
Basic procedure: paint mixing → spraying
Common 500ml plastic bottles wholesale spray paint has a singe colour and gradient color, which can be customized according to customer requirements spray paint colour. In you need silk-screen printing with logo, it is necessary to have screen printing first before spraying paint.
Plastic water bottle lid injection molding
Material preparation → mold replacement → material addition → injection production of various parts of accessories → surface treatment trimming → assembly
Injection molding is a process in which the plastic is first plasticised in a heated barrel by stirring it evenly and then pushed by a plunger from the injection port into the cavity of a closed mold. The molten plastic is injected into the mold at high pressure and temperature, cooled and cured, then the mold is opened and the product is removed.
Injection molding is suitable for almost all thermoplastics, with masses ranging from a few grams to tens of grams, and can produce complex, precisely dimensioned molded products in a single pass.
Advantages: fast production and high efficiency.
Disadvantages: high cost of equipment and molds for drinkware manufacturers, difficult to clean the injection molding machine, etc.
Applications: lids, spare parts, plastic water bottles, etc. Injection molding is used more for lids and bottle blanks.
Injection blow molding of plastic water bottle
Material preparation→ molds replacement → feed material → injection molded bottle blanks → bottle blanks heated and softened → bottle blanks placed in blow molds → dust removal by air gun → bagging
Different blow molding methods have different advantages in processing different products due to the differences in raw materials, processing requirements, output and their costs.
Blow molding, also known as hollow forming, is a method of making a hollow product by using gas pressure to blow up a hot blank closed in a mold, blow molding is mainly used for plastic bottle bodies.
The commonly used bottle process by BPA free water bottle manufacturer is injection followed by blowing, in which the preforms are first injected in an injection mold, and then the molded preforms are heated and softened into a blow mold to be blown into shape. This bottle process is faster compared to the fully automatic one, with an average output of 3,000 bottles a day from one machine, just more labor intensive.
Plastic water bottles are generally cheaper due to their ease of use and the relatively little amount of materials used. As for the design of the BPA free water bottles, whether the size or the dimensions of the various parts, is closely related to its corresponding molding process. Only by designing the size of the water bottle can you choose to produce the corresponding processing and molding. In conclusion, the colorful plastic water bottle with its excellent overall performance, and reasonable price are conducive to environment-friendly society and the increasing expansion of the product.
Everichhydro embraces automation and invest a lot into it to keep competitive in the whole industry, to handle your project in a short time. We have rich OEM&ODM experience for BPA free water bottles and could offer high quality products at a reasonable wholesale price. Feel free to contact us!