Monthly Archives: June 2018

Types of Locking Washers and Their Uses

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What is Lock Washer?

The locking washers can be made of metal or non-metal materials. The purpose in using them is to keep nuts and bolts from vibrating or friction loose. They are many different shapes and sizes, but they all try to achieve the same goal. When properly applied, lock washers provide a shabby, basic way to keep threaded fasteners steady over a long period of time.

 

Washer dimensions can come in either imperial or metric units. If you do not have a specific size most manufacturers will be able to custom build a washer to fit your application. Washers can follow ANSI, SAE, USS, and JIS sizes as well.

 

Below, there is a list of split lock, sealing, internal tooth, external tooth, flat, and flat retaining. And I will tell you what each one is and their use.

 

  1. Split Lock – Split locks are also called helical spring lock washers. These are made out of a spring coil that cut or split. This makes it so the two ends of the coil forced outward to the mating surface. So when the washer is fastened each end of the coil will bite into the surface of the head of the screw and to the surface to which you are fastening too.

 

  1. Sealing – Sealing washers use a form of a silicone rubber that is bonded to the steel of the washer. These are made to be used with screws, bolts, and nuts. They are a simple solution to any sealing needs. They have a seal on the bottom of the washer that seals the surface of the washer face, and a seal at the top that encases the shank and under the head of the fastener making a complete seal from top to bottom.

 

  1. Internal Tooth – Internal tooth have teeth on the inner dimension of the washer and the outside of the washer is smooth. They are made for fasteners who have a smaller head. When the head is fastened into the hole the internal teeth will help grab the surface, while at the same time resisting against the force of the washer being compressed.

 

  1. External Tooth – External tooth have teeth on the outer dimension of the washer so that they can actually bite into the surface that it is put on, and the inside is still a cylindrical hole. They are designed for fasteners who have a bigger head. When the head is fastened into the hole the external teeth will help grab the surface, while at the same time resisting against the force of the washer being compressed.

 

  1. Flat – Flat washers are used for basic applications, where the hole is cot directly in the center of the washer. Standard or metric, it does not matter they can accommodate all shapes and sizes.

 

  1. Flat Retaining – These have multiple holes in them so that you can screw or bolt down the washer, and the second hole would be for running your wire to the screw or bolt.

 

Where Can You Find The Locking Washer Supplier?

I recommend that you can visit the website of Chin Hsing Precision Industry Co, Ltd.

 

Chin Hsing is a professional and experienced manufacturer of metric lock washer with “CS” Brand. You also can find quality adapter sleeves, bearing lock nuts, and much more products there. Now, contact Chin Hsing at 886-5-2765634 for more details!

 

Article Source: https://forum.digikey.com/t/types-of-lock-washers-and-their-uses/930

Best Square Pipe Making Machine: Recommend Roll Forming Machines Manufacturer – Yunsing Industrial

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Taiwan First Choice of Roll Forming Machine Supplier

Established in 1972, Yunsing Industrial Co., Ltd. hold “adhering to excellent quality and enhanced reliability to create outstanding customer satisfaction” as our business philosophy, Yunsing has accumulated more than 40 years of experience specializing in manufacturing steel plate automatic cold roll forming machines with advanced technologies and superior quality products, such as roofing and wall cladding, corrugated sheets, stepped tile roofing, floor decking, C-Purlin, rolling shutters and door frames.

 

Below, I will present you an excellent machine from Yunsing, that’s square pipe making machine.

 

Square Pipe Roll Forming Machine


YS-300 Square Pipe Making Machine complete with hydraulic cutting, including angular cutting, and punching hole devices by computer system.

 

Yunsing’s roll forming machines are driven by chain in hydraulic system. Chain Drive System can save the power compare with other system. That also means that customers do not need to pay the extra power fee during production of steel channel.

 

Features:

  • Without any welding
  • Using raw material is Galvanized coils, so the pipe inside is also galvanized
  • The length of the pipe is variable
  • All punching and cutting, inclduling angular cutting are automatic
  • Automatic stacker, so two workers can handle this production line

 

Certificate:

SGS; CE

 

Order Information:

  • Minimum Order: one set
  • Branded Product
  • FOB: Any port in Taiwan

 

If you need more information about square pipe making machine, please come and visit Yunsing Industrial Co., Ltd. for further details.

 

 

Yunsing Industrial Co., Ltd.

No, 472, Yen Ping N. Rd., Sec. 6, Taipei, Taiwan R.O.C

TEL: +886-2-28120007

FAX: +886-2-28131932

Email: info@yunsing.com.tw

What Plastics Are Approved for Food Contact Applications?

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If you’re looking to create plastic food packaging, it’s essential that you understand which plastics are food-safe. Food-safe plastic resins are those approved for contact with edibles by the Food and Drug Administration (FDA). They are known as food contact substances (FCS).

 

The FDA defines food contact substances as “any substance that is intended for use as a component of materials used in manufacturing, packing, packaging, transporting, or holding food.”

 

Here are the most common plastic resins approved by the FDA for food contact.

 

Polyethylene Terephthalate (PET)

PET resin is widely used in plastics that have food contact applications, from the ubiquitous 2-liter soda bottles to salad dressing bottles to peanut butter jars. The vast majority of single serving drinking bottles are made from PET. Specially-treated PET containers are microwaveable and used in take-out containers and single-serving food trays.

 

The FDA has approved both virgin and post-consumer recycled (PCR) PET for food contact. The resin has been thoroughly studied for negative health effects and found to cause none. According to a foundational study, “PET itself is biologically inert if ingested, is dermally safe during handling, and is not a hazard if inhaled.”

 

PET resin is stable. That means it doesn’t degrade when in contact with food or beverages, it resists corrosion, and it repels microorganisms. These qualities that make it ideal for food contact.

 

Polypropylene (PP)

Polypropylene is a widely used plastic. You likely have polypropylene plastic in your fridge and cupboards right now: it’s regularly used in reusable food storage containers. It’s also the resin used to make yogurt containers and other single-serving tubs.

 

PP plastics are approved for food contact. They are inert materials and do not present a health hazard to the consumers. The FDA began to approve recycled polypropylene as food-safe in 2013.

 

Polypropylene’s high melting point makes it suitable for microwaveable food containers. It’s nonvolatile and doesn’t react to liquids, acids, or bases, so PP food container is perfect to store a wide variety of foods.

 

High-Density Polyethylene (HDPE)

HDPE is the most common household plastic. At the grocery store, you see a lot of HDPE plastic bottles in the juice aisle and the milk case. HDPE is also used in butter containers, cereal box liners, and in large food buckets, such as those that supply school cafeterias and restaurants.

 

Virgin HDPE is a safe plastic for food contact. The FDA has sanctioned recycled HDPE for food contact on a case-by-case basis for over 20 years.

 

HDPE resin produces plastic that is corrosion-resistant and absorbs little moisture, making it well-suited for storing beverages. Also, HDPE containers don’t leach chemicals into their contents.

 

Low-Density Polyethylene (LDPE)

LDPE plastics are similar to HDPE plastics but are known for being less rigid. They are popular in squeeze bottles, such as used for ketchup and mustard; plastic films, such as those that wrap commercial baked goods and meat; and six-pack rings.

 

Virgin LDPE resins are safe for food contact. While recycled LDPE/PP blends have been approved for food contact by the FDA on two occasions, materials made from 100% PCR LDPE resin are not cleared for food contact.

 

LDPE has good chemical resistance, high impact strength, and strong wear absorption. Like PET and HDPE plastics, LDPE can hold your food products without leaching any harmful materials or allowing microorganisms to permeate.

 

Polycarbonate (PC)

Polycarbonate is commonly used in water-cooler bottles, baby bottles, and reusable water containers.

 

There’s been a lot of discussion the past few years about the food safety of polycarbonate because there is bisphenol A (BPA) in the resin). BPA is rumored to be hazardous to health. Because of the public scrutiny, it has been extensively tested. The average consumer intake of BPA is very low, and the chemical does not accumulate in the body. No health risks are known to exist at such small levels, and the FDA has concluded it is safe for food contact. Some manufacturers have substituted FDA-approved co-polyester to provide clear containers that are BPA-free.

 

PC is an especially tough plastic (it’s used for bullet-resistant windows), making it ideal for “unbreakable” water bottles and storing large amounts of a product.

 

If you need more food grade plastic containers, please do not miss the website of Marathon Enterprise Co., Ltd... You can obtain much more PP Food Containers at Marathon. Now, contact Marathon at 886-3-3590801.

 

Article Source: http://www.custom-pak.com/news/plastics-approved-food-contact-applications/

How to Choose A CNC Engraver?

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First of all, you have to pay attention to rigidity. Even the most nicely-looking engraver but with mediocre rigidity (e.g. twisted aluminum profiles) will not ensure proper operation. This can cause jagged edges, burrs, and clear traces of the tool vibration during operation. The machine cannot have sliding elements because they will quickly abrade and backlash will occur. So linear roller bearings and ball screw gears must be applied, which will allow the elimination of backlash.

 

As for the control system, engraving machines which communicate with a PC via serial or parallel ports have already gone out of date. For large works, in particular 3D ones, the file can reach tens of megabytes. Currently only Ethernet and technologies based on it come into play, which enables convenient operation of the machine with full visualization while working in real time.

 

A highly important thing is also the control software. Forget the printer driver which allows “printing” to the engraving machine. The engraving control software must generate the tool path itself (internal and external correction, concurrent and counter treatment, excavating pockets, excavating pockets with detection of islands, working on many stages of plunge cutting, cutting corners with an engraving cutter, etc.)

 

Well, and finally the speed – the fastest engraving machines reach the feed rate up to 1500mm/s, but the speed 150mm/s is good enough. Machines which reach speed not exceeding 50mm/s are toys.

 

If you have any interest in CNC engravers, please do not miss the website of Ares Machinery Co., Ltd. – the company specializes in a variety of tapping centers. Learn more details, welcome to contact Ares Machinery at 886-4-24925555.

 

 

Article Source: http://www.kimla.pl/en/HowtochooseaCNCengraver

3 Benefits of Hydraulic Pumps

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A pump is a device which has many purposes and can be used for various tasks and in various industries. Usually pumps are used to transfer certain substances like gas or liquid from one place to another. There are many types of pumps, but one particular which is widely used is the hydraulic pump. These pumps can be either hydrostatic or hydrodynamic and are used mostly in hydraulic drive systems. Gear pumps, rotary vane pumps and screw pumps are the three most commonly used types of hydraulic pumps. All are used in many different industries.

 

Whereas most pumps use some external power source to operate, hydraulic pumps use the kinetic power of the water as their main source for operation. They are very durable, easy and relatively cheap to maintain and very practical. These pumps are also very efficient which is why they are common in many industries and inevitable tool for many companies. Here are few major benefits of hydraulic pumps.

 

The hydraulic pumps are very useful source of energy and power for many machines. They have a capability and are designed to push large amount of fluid through a metal cylinders. This is how these pumps transform mechanical energy into hydrostatic energy. Hydraulic pumps have been used for many years, but their popularity slowly dropped with the emergence of the electric and solar pumps. However, today, the interest for hydraulic pumps has increased as it is a very effective device for providing clean drinking water in rural areas or in the financially unstable countries which have battle the lack of water problem.

 

Also these pumps are widely used by government agencies when dealing with certain types of natural disasters such as floods. In the case of a flood, hydraulic pumps will quickly and effectively pump out excess water to reduce the overall damage to some extent. Households located in flooding areas should have one of these. They may look complicated but are really very easy to use and maintain and can find usage even in the most remote places. One of the biggest benefits that a hydraulic pump can provide is getting the water from underground sources that are not contaminated. The lack of clean water and the hygiene problems are major concerns in developing countries. The hydraulic pumps surely help a lot in solving such problems. This brilliant engineering invention can be used in almost any industry which is the main reason it is so popular.

 

If you need more information about hydraulic pump suppliers, I recommend that you can visit YEOSHE Hydraulics Co., Ltd. – the company specializes in kinds of pumps including hydraulic vane pump, tandem pump, excavator pump, etc. Learn more details, please do not hesitate to check out YEOSHE website.

 

 

Article Source: http://www.3benefitsof.com/3-benefits-of-hydraulic-pumps/

What is UV Curing Resin?

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UV curing resins are materials that are polymerized and cured in a short time by the energy radiated from ultraviolet irradiation devices. These are especially used as industrial materials for sealing, bonding, and coating.

 

Excellent Characteristics of UV Curing Resins:

  • Because the curing speed is fast, working hour is shortened.
  • Because they do not cure without UV irradiation, restrictions are few in the coating process.
  • They can cure at a low temperature.
  • Because of nonsolvent, one-part resin, they provide good workability.
  • A variety of cured features is available.

 

Because the products provide these advantages, cost reduction can be achieved in various fields.

 

Ultraviolet Irradiation Devices

  • Conveyor Type: Suitable for mass production of mid- and large-scale workpieces.
  • Spot Type: For bonding and partial temporary fixing of compact parts.
  • Handy Type: Built-in type in the production line.
  • Unit Type: For partial irradiation to experimental or large-scale workpieces.

 

Points To Select A Lamp Or A Lamphouse

  • Appropriate wavelength of the lamp Short wavelength is effective for surface curing and long wavelength for depth curing.
  • Enough emission intensity Select them considering the attenuation of the light intensity due to a long use of the lamp.

 

Please note especially above two points to choose the lamp and the lamphouse for a UV-radiation system.

 

Conclusions

As the UV curable resin is single-component and non-solvent, it does not contaminate the work environment with any solvent. This adhesive is cured within seconds. Its excellence in mass production significantly helps reduce the production processes.

 

If you need more information about UV curable resin, please do not miss the website of Epolab Chemical Industries Inc. – the company is the leading epoxy resin supplier in Taiwan. You can find kinds of epoxy adhesives on their product catalog. Learn more product details, come and visit Epolab Chemical and feel free to contact them at 886-3-4521501.

 

 

Article Source: https://www.threebond.co.jp/en/technical/seminar/ucuringvresin.html

Do You Know What Thermoplastic Polyurethane Is?

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Thermoplastic polyurethane (TPU) is an elastomer that is fully thermoplastic. Like all thermoplastic elastomers, TPU is elastic and melt-processable. Further, it can be processed on extrusion as well as injection, blow and compression molding equipment. It can be vacuum-formed or solution-coated and is well suited for a wide variety of fabrication methodologies. TPU can even be colored through a number of processes. But more so than any other thermoplastic elastomer, TPU can provide a considerable number of physical property combinations making it an extremely flexible material adaptable to dozens of uses.

 

This is partly because TPU is a linear segmented block copolymer composed of hard and soft segments. The hard segment can be either aromatic or aliphatic. Aromatic TPU’s are based on isocyanates such as MDI while aliphatic TPU’s are based on isocyanates like H12 MDI. When these isocyanates are combined with short-chain diols, they become the hard block. Normally it is aromatic, but when color and clarity retention in sunlight exposure is a priority, an aliphatic hard segment is often used.

 

The soft segment can either be a polyether or polyester type, depending on the application. For example, wet environments generally require a polyether-based TPU while oil and hydrocarbon resistance often demand a polyester-based TPU. For even greater utility, the molecular weight, ratio and chemical type of the hard and soft segments can be varied.

 

This versatility results from the unique structure of TPU that results in high resilience, good compression set, plus resistance to impacts, abrasions, tears, weather, and even hydrocarbons. TPU offers flexibility without the use of plasticizers as well as a broad range of hardness’s and high elasticity. In fact, TPU bridges the material gap between rubbers and plastics. Its range of physical properties enables TPU to be used as both a hard rubber and a soft engineering thermoplastic. TPU’s can be sterilized, welded, easily processed, colored, painted, printed, die-cut and slitted. They have low temperature flexibility and, in some grades, exhibit biocompatibility, hydrolytic stability, optical clarity, plus flame retardant and anti-static properties.

 

TPU Compounds

 

Further, TPU can be compounded for use in numerous applications where greater structural integrity is required, such as for automotive body side moldings. For example, when mixed with glass fiber or mineral fillers, TPU’s properties of abrasion resistance, paintability, high impact strength and good low temperature flexibility can all become enhanced, and the compound also demonstrates good fuel and oil resistance and high melt flow characteristics.

 

In addition, TPU is an outstanding contributor of polymer blends. When added to polyvinyl chloride (PVC), TPU improves compression set, abrasion resistance and low temperature flexibility.

 

When added to polycarbonate or acrylonitrile-butadiene-styrene (ABS), a TPU resin with a nominal flexural modulus of 18,000, produces compounds with flexural modulus values up to 150,000 psi. In this way, specialized compounds can be made that improve the properties of polycarbonate or ABS or other plastics.

 

TPU Applications

 

These properties make TPU extremely useful for hundreds of products:

 

  • Architectural Glass Lamination
  • Auto-Body Side Molding
  • Automotive Lumbar Supports
  • Caster Wheels
  • Cattle Tags
  • Constant Velocity Boots (Automotive)
  • Drive Belts
  • Film and Sheet
  • Fire Hose Liner
  • Flexible Tubing
  • Food Processing Equipment
  • Footwear—sport shoe soles
  • Hydraulic Hoses
  • Hydraulic Seals
  • Inflatable Rafts
  • In-Line Skates
  • Magnetic Media
  • Medical Tubing / (+IV) Biomedical Apparatus
  • Mining Screens
  • Sporting Goods
  • Swim Fins and Goggles
  • TPU Coated Fabrics
  • Wire and Cable Coatings

 

Whether for its outstanding toughness, durability or processing ease, TPU is a versatile performer that bridges the gap between rubber and plastics.

 

If you have any interest in learning more details about TPU resins, come and visit the website of Great Eastern Resins Industrial Co. Ltd. – the company is one of excellent adhesive manufacturers in the industry. You can find industrial adhesives, shoe adhesive, water based adhesive, spray adhesive, TPU resins, and much more products at Great Eastern Resins. Get more information please feel free to check out Great Eastern Resins product catalog.

 

 

Article Source: https://polyurethane.americanchemistry.com/polyurethanes/Introduction-to-Polyurethanes/Applications/Thermoplastic-Polyurethane/

Why Choose a Manual Tree Pole Pruner?

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K&W Tree Pole Pruner

Seven reasons to choose old-fashioned muscle power and the superior reach of a pole saw, when you are pruning a tree:

 

  1. Manual tree pole pruners are often the best choice for pruning smaller or higher branches. They are lightweight, easy to handle, and will not leave you with a sore back (if you are careful).
  2. They can be found in much longer lengths than powered saws. Professional pole pruners can reach up to 21 feet, and you don’t need to be Hercules to use one.
  3. You do not need to run cables or struggle to start a gas engine that has been laid up for too long.
  4. Some trees have dense growth patterns and tangled twigs that can jam chainsaws. I would never use power tools on an old, gnarled apple tree, for example.
  5. Working with a pole allows you see the overall shape of the tree as you work. You can make better pruning decisions as you sculpt it to thing of beauty.
  6. Ladders are downright dangerous.
  7. The long reach keeps you clear of thorns, ants or anything else lurking in vegetation.

 

A tree pole pruner offers the genuine satisfaction of working in a quiet, relaxed way.

 

How to Choose A Tree Pole Pruner

A few things to consider as you choose:

 

  • The blades on a bypass pruner can separate on tough branches leaving them damaged but uncut.
  • Anvil pruners will never separate but softer stems can be ‘bruised’ and left open to infection by an anvil cutter.
  • Saws are always going to be the best choice for thicker, tougher branches and you will usually need the option for tree pruning.
  • Poles that flex too much can make you feel like you are ‘fishing’ for branches.
  • Cheap telescopic poles can start to twist around each other, or slide up and down, as the friction lock wears out. Oval or hexagonal poles will never twist,
  • All pole pruners involve ropes, chains or straps to operate the cutting head. Ropes on the outside of the pole are more likely to get tangled in small branches than chains. Chains or ropes inside the pole are ideal; they will never get tangled up.

 

Where Can You Find The Best Quality Tree Pole Pruners?

If you need excellent tree pole pruners, K&W Tools Co., Ltd. will be your best choice! K&W Tools is one of the professional gardening saws suppliers in Taiwan. You can find kinds of saws including pruning saws, foldable saws, curve pruning saws, bow saws, and tree pole pruners on its product catalog. Learn more details, try to contact with K&W Tools at 886-4-2372-2508.

 

Article Source: https://dengarden.com/landscaping/pole-pruner