Bottles come in many shapes and sizes, colors and dimensions. One of the most common ones found is the plastic water bottle. Made from plastic, it normally has a tapered neck, a wider body with an aperture at the top. Generally, the mouth of the bottle is sealed with a bottle cap made of plastic. These plastic bottles are characteristically utilized to house liquids such as water, soft drinks, ink, milk, cooking oil and various types of medicine.
The first known structure of natural plastic was formulated by none other than Leonardo Da Vinci. He fashioned plastic from glues derived from animals and plant life, and pooled with organic fibers. Upon aeration, the final result of this combination would be very similar to the plastic we have this day.
However, it was Alexander Parkes who initiated the original man-made usable plastic, nicknamed Parkesine at the International Exhibition, London in 1862. What would have been a promising start was dampened by the fact that producing plastic at the time was costly plus combustibility issues, the product became outdated.
Although plastic bottles were primarily utilized for commercial purposes in 1947, the production costs sky-rocketed. It was only in the 1960s that high-density Polyethylene was pioneered, and was speedily accepted by manufacturers due to its lightweight disposition and cheaper assembly costs. This greatly affected the food industry, as plastic bottles quickly replaced its glass predecessor.
Let us look at the more common types of plastic water bottles, their quality grades, conventions and restrictions. Plastic bottles are manufactured utilizing an array of techniques, and material selections depend upon relevance. High Density Polyethylene or HDPE, is by far, the most extensively employed resin for plastic bottles. This substance is popular because it’s cost-effective, shock-defiant and possesses a compatible moisture blockade. HDPE, naturally lucid and supple, is well-matched with an ample assortment of products as well as acids and caustics, but is not attuned with solvents. It also offers superior defense below sub-zero temperatures, but cannot be utilized with results packed at over 160F or those which are in need of an airtight seal.
Low Density Polyethylene or LDPE is alike in composition with HDPE. The only differences lie in its deeper lucidity, its more yielding nature and not as chemically resistant. However, LDPE bottles are more expensive than HDPE. Polyethylene Terephthalate, or more commonly referred to as polyester, is universally utilized for beverages which are carbonated and also as water bottles. Polyester is the plastic of choice because it has excellent alcohol and vital oil obstruction properties, plus its durability against shock and tensile strength is undefeatable. Polypropylene or PP, has an elevated constancy when exposed to high temperatures, which is why it is ideal to house warm liquids such as syrups. PP has a superb chemical resistance and can take heat for up till 200F. It is unsuitable to house liquids of cold temperature.