Round plastic bottle is a type of container that is commonly used for packaging various liquids, such as water, beverages, and personal care products. Round plastic bottles are ubiquitous in a wide range of industries, from beverage and personal care to household cleaning products, due to their versatility, durability, and aesthetic appeal.
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Advantages of Round Plastic Bottle
Rugged and Safe
Unlike glass containers, round plastic bottles are rugged and resilient; they don't shatter into sharp pieces when dropped, making products and packaging safe to handle. Because plastics are polymers -- long molecules made by linking many short ones together -- they have useful physical properties such as toughness and resistance to chemicals. The same resilience makes round plastic bottles unlikely to leak or burst, protecting the contents as well as exterior shipping cartons.
Shapes and Colors
Plastic materials are easy to mold into a wide variety of bottle shapes, improving their appearance and utility. For example, manufacturers incorporate integral handles, measurement marks and pouring lips into some types of round plastic bottles. In addition, plastics can range from crystal clear to any shade or color, whether translucent or opaque, making products and brands easy to identify by sight. round plastic bottles require no paint; the coloring material is mixed into the plastic resin, so it never runs, rubs or washes off.
Energy Savings
Round plastic bottles are lighter in weight than their glass counterparts, reducing energy and costs required to ship products. Because plastics are soft and have relatively low melting points, round plastic bottles take less energy to manufacture than glass.
A Recyclable Material
After first use, PET and other types of round plastic bottles are easily recycled into many types of secondary products, including carpet fibers, pillow stuffing, tote bags and strapping materials. Some beverage bottles and nonfood containers also use recycled plastic. The light weight of round plastic bottles minimizes the cost of transporting materials to recycling centers.
Material of Round Plastic Bottle
High density polyethylene
High density polyethylene, or HDPE, is a cloudy, slightly translucent-colored polymer made from petroleum. It possesses a good chemical resistance and does not absorb moisture. It also provides a good water vapor barrier. HDPE is one of the most popular plastics for molding your plastic bottles, containers, and caps. It maintains the purity of your products stored and packaged in it and will not leach harmful chemicals.
Low density polyethylene
Low density polyethylene, or LDPE, is translucent in color with a tough, wavy texture. It is also a very flexible plastic with good barrier properties. It is similar in composition to HDPE, but less rigid and chemically resistant. It is also more translucent and significantly more expensive than HDPE.
Polypropylene
Polypropylene, or PP, is best known for its versatility and flexibility. It can be molded into various applications, providing a good chemical resistance and toughness. While it is usually translucent in appearance, it can be make into a variety of colors. Plastic bottles made from PP are rigid with excellent moisture barriers. They are stable at high temperatures — up to 220 degrees Fahrenheit — and are also autoclavable and can handle steam sterilization.
Polyvinyl chloride
Polyvinyl chloride, or PVC, is usually clear when used in plastic bottles. It has excellent resistance to water, alcohols, alkalines, and concentrated acids and offers excellent flexibility and versatility along with predictable and long term stability. PVC is also ideal for your vials, tablet strips and blister packs for solid tablets.
Polystyrene
Polystyrene, or PS, gives you excellent clarity and stiffness at an economical cost. You can use it for your vitamin and petroleum jelly product packaging due to its rigidity, clarity, and chemical-resistant properties.
Polyethylene terephthalate
Polyethylene terephalatate, also known as PET or PETE, is ideal for your pharmaceutical products due to its strength, clarity, impact resistance, and barrier resistance to things like oxygen, moisture, and many chemicals, alcohols, and oils. It is usually produced in clear, but can be done in colors like amber and green. It is shatterproof, extremely lightweight, and easy and efficient to transport.
Application of Round Plastic Bottle
Soothe achy feet fast
You spent the day running errands and now your tootsies are tired and sore. The simple trick doctors recommend to soothe tender feet: Freeze a bottle of water, then roll it under your arches for a minute. Pause for another minute. Repeat for 10 minutes. The cold temperature combined with the rolling motion will ease inflammation and tightness. Aah, that’s better!
Easily separate an egg
A foolproof method to separate egg whites for the cake you’re making for the church potluck: Crack an egg into a bowl, then squeeze an empty plastic water bottle over the yolk and release. Squeezing the bottle creates a vacuum effect so the yolk gets sucked up, leaving the whites behind.
Cut down on water bills
One innovative way to repurpose spare round plastic bottles is by transforming them into water-saving devices for toilets. By filling a round plastic bottle with water and placing it in the toilet tank, you can displace water volume, reducing the amount used per flush. This simple yet effective hack not only conserves water but also lowers utility bills.
Help boots hold their shape
To keep your tall boots from falling over in your closet, leaving behind an unsightly crease in the material, try this: Before placing the footwear in your closet, slide an empty 1-liter round plastic bottle inside each boot. The bottles will help the shoes keep their shape when you’re not wearing them.
Prevent dry foods from going stale
Instead of buying pricey storage containers to keep pantry staples like rice and beans fresh, use a recycled plastic water bottle. Simply wash and dry a bottle thoroughly, then use a funnel to fill it with food and screw on the cap. The clear bottle allows you to see what’s inside at a glance, and the cap forms an airtight seal that keeps the ingredients fresh!
Easily corral project tools
When you’re working on a project, it can be a pain to have to lug around a bulky toolbox just for the few tools you need. Instead, stash them in a DIY tool tote you can take with you while you work. To do: Cut the top third off of a 2-liter round plastic bottle and wrap duct tape around the bottom of the bottle to help reinforce it. Then fill with the tools needed. Problem solved!
Outsmart doggy boredom
Cooler weather mean your active dog has less time out in the yard — and being cooped up lands her in trouble, especially when she chews on things she isn’t supposed to! To keep her occupied indoors, create a fun noisemaking chew toy. To do: Cut the leg off an old pair of jeans, then slide an empty plastic water or soda bottle in the center.
Hang a picture frame perfectly
The shadow box you created is sure to be a cheerful addition to your home office, but you can’t find your level to help you hang it. The save: a small round plastic bottle of olive oil. Simply lay the bottle on its side on the top of the frame. You’ll know the frame is straight when the air bubble settles in the middle. If it isn’t straight, just adjust until the bubble moves to the center.
Sidestep plastic bag chaos
You like to keep extra shopping bags on hand, but there’s no good spot to store them and you don’t want to buy one of those plastic bag organizers. The fix: Cut the bottom off a 2-liter round plastic bottle and remove the cap. Stuff plastic bags through the cut-off bottom. The bottle will keep the bags contained so you can pull one out of the bottle’s opening when needed.
Collect food scraps
If you usually hold a garbage can under the counter to collect food scraps but still end up with a mess on the cabinet drawers and the floor, try this instead: Make a basket that sits right under the counter by cutting a third off the top of a large round plastic bottle and leaving a skinny strip attached. Then close the strip inside the cabinet drawer.
What Do the Numbers on Round Plastic Bottles Mean?
Number 1 – PET (Polyethylene terephthalate)
This is one of the most commonly used plastic materials in the manufacture of packaging. It is usually found in bottles containing liquids such as water or oil.
Number 2 – HDPE (High Density Polyethylene)
This is one of the most common plastic materials used in bottles containing shampoo, milk or detergent bottles.
Number 3 – PVC (Poviline Chloride)
This is one of the plastic materials with the best quality/price ratio, it is one of the most consumed plastics in Spain in long-lasting products. Toys are usually made with this type of plastic.
Number 4 – LDPE or LDPE (Low Density Polyethylene)
This type of plastic is frequently found in supermarket bags, bread and plastic wrapping.
Number 5 – PP or polypropylene
This is a very versatile and strong type of plastic. Polypropylene can be found in vehicle parts, industrial materials, textiles or as an insulator in electricity.
Number 6 – PS or polystyrene
We can find it in containers for packaged food.
Number 7 – Other
This numerology means that the plastic packaging has been manufactured with a different plastic resin and is likely to contain more than one plastic resin material.
Today, Most of the plastic bottles are round, only some beverage plastic bottles are square.In fact, The plasticity of plastic bottle is very strong, It not only can shape up the common variety of plastic bottle shape, but also can customize special variety of bottle shape. This is the advantage of plastic bottles that simply created by a pair of mold.
However, Some people would ask why the plastic bottles on the market are mostly round? In fact, That is because the circular plastic bottle is easy to catch, easy to carry, and does not take up space during the transportation.
This is why plastic bottles can quickly squeeze out the market share of glass packaging. We hope we will improve the round plastic bottle into another good level.
How Round Plastic Bottles Are Made
Prepare the raw materials
The main raw material for round plastic bottles is petrochemicals, which are refined into ethylene or propylene. These chemicals are then processed into plastic pellets, which serve as the raw material for making bottles.
Melt the plastic
The plastic pellets are melted and extruded into long tubes using a machine called an extruder. The tubes are then cooled and cut into shorter lengths. These lengths are known as preforms, which are smaller versions of the final bottle.
Injection molding
In the preform injection molding stage, the preforms are heated again and placed into a mold that shapes them into the desired bottle shape. The mold is then cooled, and the preform is ejected from the mold.
Blow molding
Once the preform has been molded into the desired shape, it is transferred to a bottle blow molding machine. The preform is clamped into the machine, and compressed air is used to inflate the preform, taking the shape of the final bottle. The pressure from the compressed air also ensures that the bottle’s walls are even and uniform in thickness.
Inspection and quality assurance
After the bottle has been formed, excess material is trimmed off, and the bottles are inspected for any defects or imperfections. This is an important step to ensure that the bottles meet the required standards for quality and safety.
Labeling
Once the bottles have been inspected, they are labeled with product information, such as brand name, product name, and ingredients. They are then packaged for distribution to customers.
Types of Manufacturing Techniques for Round Plastic Bottles
Co-Extrusion Blow Molding
Multi-layered bottles are produced through co-extrusion blow molding. The layers are extruded together in the parison and fused into the final bottle. The Co-extrusion technique can be used to accomplish cosmetic effects such as adding soft-touch matte without needing an additional spraying procedure or preserving PCR on the outside layer of the bottle while using virgin material on the inside to safeguard the formula. This method can also be used to extend the barrier qualities of bottles in the same manner that it is used for tubes.
Extrusion Blow Molding
The parison forms vertically in the extrusion blow molding process. The wall thickness is controlled by adjusting the orifice size through which the parison extrudes. It then closes the mold over the parison as it hangs and transfers it to the blow molding station. This is where the bottle is made, as previously highlighted in the second phase of the RBM process. The problem of non-uniformity of the hanging parison is solved by varying the wall thickness. The weight of the formed portion would otherwise extend the hot and still-forming area above it. As the parison forms, the wall thickness increases to achieve a consistent thickness across the formation.
Reheat and Blow Molding
This procedure consists of two steps of the standard Reheat and Blow Machine (RBM) bottle production process.
Injection Blow Molding: For the manufacture of hollow plastic products, the injection blow molding (IBM) process is employed. Injection blow molding is a three-stage process. Melted plastic is pumped into a mold cavity to create a preform parison during the first stage. The preform is formed like a test tube, but it has a molded screw finish on top. The preform is subsequently sent to the second stage of blow molding. To inflate a preform against a cold mold chamber, the air is pumped through a core pin. After that, the container is moved to the third station for ejection.
Stretch Blow Molding: The injection blow molding process serves as the foundation for stretch blow molding. This involves molding a preformed parison before transferring it to a blow molding chamber. To orient and align the molecules, the parison is stretched biaxially during blow molding. The container's gas barrier, stiffness, clarity, and impact strength are all improved because of this orientation. Containers can thus be lighter as a result. PET and polypropylene are examples of stretch blow molding resins.
How to Choose the Right Round Plastic Bottle for Your Product
Stage 1
The first stage of choosing the right plastic bottle for your new product is to focus on safety and practicality issues. In other words, you need to establish which materials you can safely consider and what shapes and sizes will be practical from a filling and packing perspective. For example, while it may be perfectly safe to store some products in PET bottles until they are consumed, such bottles are most often designed for single-use only. So, if you need a plastic bottle that the customer can safely refill at a later date, you will probably want to avoid PET and focus on bottles that are made from other types of plastics instead.
Stage 2
Having established which materials, shapes and sizes you can safely consider, we recommend focusing now on convenience. Does the way in which your product will be dispensed/used from the bottle make one particular shape a better option than any other? For example, a cylindrical body with sharp shoulders is a good choice when grip may be a problem, such as when in the shower. If you are looking for a plastic bottle in which to sell your new shampoo, this type could therefore be an excellent choice.
Stage 3
Having satisfied yourself that the plastic bottles on your shortlist are the safest, most practical and most convenient options available, you can now move on to consider style/aesthetics. At this stage, we do recommend placing great importance on historical choices: if you are planning to deviate from accepted practices, you will need a very good reason for doing so. If, for example, you decide that you are not keen on the practice of using round bottles for medicines that are dispensed straight out of the bottle, you need to consider the reason they are so popular and ask yourself whether the alternative you are considering will offer the same benefits.
Stage 4
The final stage in choosing the right plastic bottle for a new product is to consider the type of labelling you require and whether this will place any constraints on the shape or size of the bottles that you choose, or on the materials from which they are manufactured. If you have your heart set on a beautiful colourful graphic that will take up a lot of space, a small container will obviously be out of the question. However, if you are keen to use a tiny, delicately-designed logo, a smaller bottle may be the perfect choice.
The Final Decision
Before making a final decision, we recommend going back over each stage to ensure that you have not missed out any important considerations. It may also be a good idea to consult a packaging expert and talk to the manufacturer from which you will be ordering your new bottles, to see if they have any recommendations, suggestions or advice. Sometimes, a fresh perspective, especially from an industry specialist, can be invaluable when choosing packaging for a new product.
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FAQ
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Q: Which plastic bottles are safe for drinking water?
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Q: What is the code 58 on plastic bottles?
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Q: What does number 2 mean on plastic bottles?
Q: What does the triangle at the bottom of plastic bottles mean?
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