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Wednesday, March 20, 2013

Carbon Fibre Bicycle Frame


If you are a racing bike enthusiast, you would have probably heard about steel, aluminium or even the expensive titanium material for bicycle frames already. The latest in technology has made some materials even better. An example of such material is the carbon fibre.
What is carbon fibre? Some people would prefer to call it by its scientific name, thermoplastic. Unlike the conventional materials, carbon fibre offers big potential for the future of bicycle materials.
In its early development, carbon fibre was not favoured. There were problems with the bending of frames and frames which had aluminium lugs. There were also additional disasters like the failure of adhesive methods due to the limited technology at that time.
This material is a type of polymer. Therefore, the formation methods are very important in producing a high-strength thermoplastic. There are many kinds of construction techniques. The most common method is by mixing sheets of carbon fibre fabric together with both sides of the mould. Then, a process called curing ensues. The result is a monocoque carbon frame. Monocoque utilizes the exterior structure to support the overall weight and stress induced to the bicycle. Why is this type of construction method so popular? That is because it provides excellent protection against vibration and high efficiency when paddling.
Why should you choose carbon-fibre type of material for your bicycle? You would want a carbon-fibre type if you are looking for the highest stiffness and strength to weight ratio. But you should also be prepared to fork out more money in the process. It is the latest breakthrough in bicycle frame advancements.
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Carbon Fibre Bicycle Frame



Monday, March 11, 2013

Hemp Reinforced Plastics


Henry Ford was the first person to develop a hemp plastic. The famous pictures and film of Henry Ford striking a model-T with an axe and the rebound of the axe head was a means of showing off the amazing strength of fibre composites. What type of composite plastic this was is unknown.
Polypropylene is a versatile plastic and probably the most commonly used in the world today. Hemp plastic was used the first time to make the 'High-Fly' Frisbee. The annual use of plastic around the world has increased from a mere 5m or so tonnes in the 1950's, to a massive 100m tonnes today. From a single tonne of plastic, manufacturers could produce 20,000 two litre bottles, or 100,000 shopping bags. Today's average household dustbin has a 7% plastic content.
Although a significant proportion of PP is used in fibre production, the remainder is nearly all used in injection moulding. Although hemp fibre blended with PP - whilst improvements to heat properties and tensile strength of the plastic are desirable - is more expensive generally.
Only in the Last year have we seen the introduction of new larger production centres which have improved the cost of production and include the manufacture of hemp reinforced PP, Polyhydroxybutyrate (PHB) and PolyLactic acid (PLA). A 50% hemp content is usual in these plastics but up to 80% can be used in some materials. Mixing hemp with PLA to make plastics produces a material that is 100% biodegradable.
Hemp Plastic can be produced in various forms to manufacture:
GPS units
Smartphones
Laptops
Electrical points
Cookware handles
Lamps
Toys
Railway industry
Water supply materials
Gardening Equipment
Many other household items
In PP reinforced glass-fibre, heat-resistant ABS and PC/ABS applications, hemp is the more cost-effective choice with the added bonus of enhanced material properties. Flame retardant hemp can be produced using far fewer toxic chemicals than are common in the plastics industry. Some types of hemp plastic can now be made from rice starch with research into blow-moulding currently at a high level. Once perfected, this would allow the use of hemp plastic in the manufacture of plastic bottles and bags. This type of plastics production is usually based on corn starch.
The granular form of hemp plastic has only been available in recent times, with rapid growth now expected in the hemp plastics industry - especially as oil prices keep rising and reserves keep reducing - hemp can be produced sustainably and at a stable cost. Agreements on CO2 reduction by governments globally plus the move towards a non-reliance on oil makes hemp a clear choice for plastics manufacturers of the future.
Hemp plastic products can be made using the same injection moulding machinery as with conventional plastics. Visit the website below to see a didgeridoo made from 100% hemp! Extremely strong, this material is made entirely without resins or glues. The full range of applications for these patented plastics has not yet been found, with ideas for new products arising every day. In years to come you may be driving cars that possess strength previously unknown, similar to the model-T that Henry Ford used as a demonstration in the early 20th century.

Wednesday, March 6, 2013

Fibreglass Mouldings With Hand-Lay Technique


As with many types of material, fibreglass mouldings can be created with a range of methods. From garden shed based laminating for personal projects, to large scale manufacture, there are numerous methods of applications and manufacture of fibreglass available. As you can imagine most of the manufacturing methods have evolved for the years and have been created to solve a certain problems that have arisen. You could say that fibreglass has gone through 70 years of evolution, and possibly more so than most other materials in that time. As wood and metals have been used for a much longer time, fibreglass has experienced a rapid advancement. One of the the first methods employed to create fibreglass mouldings is called Hand lay. This is often the starting manufacturing technique learned by trainee laminations.
Since the invention of GRP (fibreglass) at the end of the World War 2 hand lay is both the most simple, and cost effective method when compared to the alternatives. Spray Lay is also cost effective, but does not result in such high quality products. Despite the key qualities of hand lay, the fibreglass mouldings produced with it can yield a range of results. An untrained or inexperienced laminator can often only produce very crude edges and simple shapes. The most common unprofessional use of hand-lay is usually applied like a paint, which can result in often messy repairs or products. These bad applications often give fibreglass a bad name, however with a professional Fibreglass mouldings solutions company, hand lay can be a hallmark of quality.
Far from garden shed kit cars and boat repairs fibreglass can provide an unmatched level of consistent quality when compared other materials. When the hand lay process is combined with high quality tooling, moulds, and a capable skilled laminator the quality can be unmatched. Unlike high quantity mass manufacturing methods, your gaining the experience of the laminator in each product. You gain multiple sets of eyes, constantly providing strict quality control. You may think, like other hand crafting methods that you gain imperfections, and subtle differences in each product. But with Fibreglass, a high quality mould ensures every product is identical. Hand laid fibreglass often results in the best quality GRP, perfect for high fidelity products for fibreglass furniture and technologies.
You can see examples of this in many airports, and mass transit terminals as they are well suited for those types of installations. This method is also good for high performance uses, many racing mouldings often employ the use of hand laid fibreglass. It is still even used by the ministry of defence, and many of their contractors for radomes, shrouds and other military equipment. This is due to its hard wearing nature, and its microwave transparency. Military uses often test fibreglass to its limit, and many of the Fibreglass mouldings have been made with sufficient layers, and technologically advanced glass fibre weaves that allow GRP to have bullet proof qualities. Although Perspex, Kevlar, and a variety of metals are usually the first choice for bullet proofing when human life is involved.

About the Author :
Dave has worked in both the IT, and the fibreglass worlds for over 20 years now. Based in sussex which is the heart of the British GRP world he now owns his own fibreglass mouldings company. He often rambles on about GRP and its benefits, and now he turns some of those ramblings into articles. He hopes you enjoy them

Monday, March 4, 2013

Kevlar Body Armor and Bulletproff Vests


Body armors are protective shields that stop the projectiles from penetrating into the body. Present day armors are generally called as bulletproof vests. Moreover, the advancement in the ammunition technology has lead to the development of different types of body shields. Police personnel, army men and private security guards mainly use these bulletproof vests.
The design of body armor and the material used in them varies. Kevlar fiber is the most effectual material used to make body shields or armors in recent days. The unique characteristic of the Kevlar is that it is lightweight. However, it is stronger than the hardest steel available.
The Kevlar fibers are twisted and interwoven individually covered by other materials such as resin as well as plastic. Kevlar material is capable of absorbing huge energy.
Types Of Body Armors:
1. Soft bullet proof vest: Police personnel and private security guards use this type of vest very commonly. They are made of woven fibers and soft clothing, which are interwoven together into net. Soft bullet proof vests protect the users from ordinary weapons and reduce the impact of bullet by dispersing its energy. These bullet proof vests are incapable to protect from high caliber ammunition.
2. Interceptor vests: Interceptor bulletproof vests are made of Kevlar vest and other small protective plates. They weigh around 16.4 lbs. These plates are removable and serve as protection to throat, groin, front and back. These types of vests are capable of stopping 7.62 mm of bullets from penetrating into the body.
3. Personnel Kevlar vest: This type of physical armor or vest is made of thick Kevlar filler. Personnel Kevlar vest has different sections to offer better fit. This type of Kevlar vest has swivel shaped shoulder pads, two frontal pockets, a ¾th collar, two hangers to hold grenade and butt patches at the shoulder area to carry a rifle.
4. Dragon skin armor: Dragon skin armor is made of small spherical discs. The discs used are of silicon carbide ceramic, which are overlapped one over the other same as that of fish scales. The peculiar arrangement of this armor offers higher flexibility and protects the body from the multiple hits.
Written by : content Marcia Henin on behalf of Israel-Gear.com - provider of Body armor [http://www.israel-gear.com/servlet/the-BulletProof-Products-cln-Bullet-proof-vest/Categories], Bulletproof vest [http://www.israel-gear.com/servlet/the-BulletProof-Products/Categories] and Kevlar vest
Bulletproff Vest