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How Is a Mooring Buoy Made?

2013-06-26   Views:11

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Step 1: Blow Molding the Sphere Most mooring buoys are made from high-density polythene (HDPE) through a common manufacturing process known as "blow moulding." To begin, small pieces of HDPE are poured into a hopper where they are melted into a homog

How Is a Mooring Buoy Made?

Step 1: Blow Molding the Sphere

How Is a Mooring Buoy Made?

Most mooring buoys are made from high-density polythene (HDPE) through a common manufacturing process known as "blow moulding." To begin, small pieces of HDPE are poured into a hopper where they are melted into a homogenous liquid. The liquid HDPE then flows into a long cylinder with a giant drill running along it. This drill rotates slowly, pushing the molten HDPE toward the end of the cylinder. Once at the end, the HDPE flows into a slightly cooler chamber called the "die head." The die head chamber has a long cylinder running from top to bottom, where a second opening is. This cylinder is known as the "blow pin." An automated gear lifts a gasket at the bottom on the chamber, allowing the liquid HDPE to gently ooze down around the blow pin. The bottom on the blow pin extends into a sphere-shaped mould, comprised of removable hemispherical moulds. Once a set amount of semisolid HDPE is hanging from the blow pin, pressurised air is pumped into the blow pin via an opening at the bottom. The HDPE is too thick for the air to escape; rather, the pressurised air inflates the HDPE like a balloon. Meanwhile, as the HDPE expands, new molten HDPE is fed into the mould from the die head chamber. Once the HDPE touches the surface of the metal hemispheres, it expands to fit to the entire sphere. The cool metal causes the HDPE to harden, creating a permanent sphere shape. The gasket then seals shut and the buoy can be removed.

Step 2: Filling the Sphere with Polystyrene Foam

The buoy now consists of a hollow HDPE sphere with 1mm-thick walls and a small opening at the top where the blow pin was. Next, to ensure that buoy stays buoyant even in the event of a leak, two liquids are poured in the opening. Once in contact, these chemicals spontaneously form a hot, rising foam of polystyrene that fills the entire inside of the sphere. After an hour, when the foam has completely hardened, the manufacturer will drill a 3- to 4-cm wide hole from the blow pin opening to the opposite side. Any jagged edges from the drill are sanded down and paint/decals are applied to the outer shell.

Step 3: Fitting the Buoy with Chains

How Is a Mooring Buoy Made?

A rod with bolt threads along both ends is passed through the central hole. Special disk-shaped seals called "washers" with nuts just above them are screwed firmly to each end of the rod, creating a waterproof seal for the entire hole. The rod twists into loops on each end, designed for special metal loops with bolts ("shackles") that attach to chains to the mushroom anchor below and the ships above.

How Is a Mooring Buoy Made?

How Is a Mooring Buoy Made?

Category:HealthRelease time:2013-06-26Views:130

Step 1: Blow Molding the Sphere Most mooring buoys are made from high-density polythene (HDPE) through a common manufacturing process known as "blow moulding." To begin, small pieces of HDPE are poured into a hopper where they are melted into a homog[More]

How to Build a Mooring Buoy

How to Build a Mooring Buoy

Category:HealthRelease time:2013-09-12Views:130

Haul the anchor; move the boat to the next "sweet spot" where the fish are known to bite. Drop the anchor; catch no fish. Repeat until your arms feel like they'll fall off. Unfortunately, you can't throw the boat into park and expect it to stay where[More]

How are zip lock bags made?

Category:HomeRelease time:2012-06-12Views:130

A zip lock bag is a thrifty little reusable, sealable and resealable baggie that comes in many sizes and dimensions, and can be used for many different things. You can use zip lock bags to freeze meat or vegetables, keep track of extra buttons, carry[More]

Mooring buoy installation

Mooring buoy installation

Category:HealthRelease time:2014-06-06Views:130

A permanent mooring for your boat must be far stronger than a simple anchor: Since the boat will often be unattended and subject to winds, tides and possibly severe weather, you must be confident that the mooring will hold your boat safely, under all[More]

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Category:HealthRelease time:2012-01-10Views:130

Stuff a PVC pipe segment with buoyant foam to create a floating buoy. Mark the location of divers, traps, and display signs using these buoyant creations. Decorate them with bright colours to make them easier to see and identify as your own. These bu[More]

How to Make PVC Buoys

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Buoys purchased from a marine store or similar establishment can be very expensive. Making your own buoy to help mark a prime fishing spot, a dock location or safe swimming area can be cost effective. Using affordable polyvinyl chloride (PVC) pipe an[More]

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Category:StyleRelease time:2012-06-19Views:130

A cap makes an excellent gift for anyone who lives in a cold-climate area. The beanie-style cap was first made popular by sailors, who wore the knitted headgear on deck while on watch duty. These "watch caps" made their way into mainstream fashion wh[More]

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Even if you've never put together a single scrapbook page in your life, understanding how scrapbook paper is made will give you a new appreciation for one of the main ingredients of the popular hobby of scrapbooking. Materials Materials use to create[More]

How much money can be made in the bakery business in the UK?

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Category:FamilyRelease time:2012-11-20Views:130

It seems like bakeries, and indeed bakers, were far more prevalent years ago than they are now. There was a bakery in every village and being a baker was a reasonable career choice for a young man – much like being an engine driver or bus conductor.[More]

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Category:HomeRelease time:2012-11-28Views:130

Preparing to buy ready-made curtains can be exciting for a new homeowner, or even if you are just redecorating a room. Before you can buy, however, you’ll want to measure so you know how large your window is and where you would like for the curtain t[More]

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A check that is made out to two people is typically referred to as a two-party check. A two-party check can be made out to two people in a variety of ways. The way the check is made out actually determines how someone would go about cashing that two-[More]

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A mad scientist party theme can be enjoyed by budding young scientists, but it can also work well for teen and adult parties, too. Most of the costumes, decor and props you'll need are simple and inexpensive to make. You'll need careful planning and[More]

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Making a fake ID is a good way to learn how the process of producing identification works. In most cases the ID people want to spoof is a state-issued driver's license, so that is what this article covers. A clever fake can make an interesting gag gi[More]

How Is a Travel Trailer Made?

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Travel trailers can be made by hand by consumers or manufactured at a plant. Do-it-yourselfers can order travel trailer plans online which include blueprints and a materials list. Design The first step towards building any travel trailer is obtaining[More]

How to Find Stereo Equipment Made in the 1980s

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Sound recorded in stereo is produced by at least two independent audio channels which are transmitted through a symmetrical set up of loudspeakers . This technique is used to give the impression that it is being heard from different directions, simil[More]

How to Make a Lake Made Out of Clay in a Diorama

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Creating a diorama continues to be an effective educational activity for kids to complete. Kids can make dioramas as an expression of a scene from a book they've read, a play or movie they've seen as an alternative to a book report or movie or theatr[More]

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Category:HealthRelease time:2012-02-23Views:130

TaylorMade Golf designed its R7 drivers with Technology for Launch Control, or TLC. The club head has two distinct ports at each end (toe and heel) that allow golfers to add or remove weights. This feature can be used to manipulate the ball's flight[More]

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A special kit can transform a motorcycle into a three-wheeled trike. A converted trike typically does not require special titling, as crucial elements, such as the engine, are unaltered, and the bike has an assigned Vehicle Identification Number. In[More]

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The National Cash Register (NCR) Model 100 cash register was produced from the late 1890s until 1904. Unfortunately, NCR does not carry parts for its antique models. Fortunately, clearing houses and collectors clubs do have antique parts, including k[More]

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