Yearly Archives: 2017


Attain the best results developing a no cost seo contract

An advanced level search engine optimization company and you want to stay hanging around, then you must know where you’ll get an excellent seo contract. Anything is audio and entire resistant at any rate with all that you will want in a determination. The agreement has relation to use, they have negotiation, schedule of responsibilities, managing problem, day of finalization, time to overall, and many more.

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Obtain the best final results using a cost-free search engine marketing deal and you will will understand that you are making more cash then you definitely utilized to by not losing many customers. A great theory and causes it to be less difficult and much less stressful in order that emphasizing your seo function isn’t an poor expertise.


Blown Film Extrusion Introduction

Blown Film Extrusion Introduction
Blown film extrusion is a technology that is the most common method to make plastic films, especially for the packaging industry. The process involves extruding a tube of molten polymer through a die and inflating to several times its initial diameter to form a thin film bubble. This bubble is then collapsed and used as a lay-flat film or can be made into bags. Usually polyethylene is used with this process, and other materials can be used as blends with these polymers. A diagram of a polyethylene chain is shown in Figure 1 to the right.
Background Theory on Polymers

In the cooling step of blown film extrusion, the amorphous, transparent melt crystallizes to form a translucent, hazy, or opaque film. The point where opacity begins in the bubble is known as the frost line. 
Fig 1: Model of polytheylene chain frompolyethylene Wikipedia article.The frost line height is controlled by several parameters: the air flow, film speed, and temperature difference between the film and the surroundings. Properties of the film, such as tensile strength, flexural strength, toughness, and optical properties, drastically change depending on the orientation of the molecules. As the transverse or hoop direction properties increase, the machine or longitudinal direction properties decrease. For instance, if all the molecules were aligned in the machine direction, it would be easy to tear the film in that direction, and very difficult in the transverse direction.

The Film Blowing machine Process

Fig 2: Schematic of set-up from User:J.Chiang.

Typically, blown film extrusion is carried out vertically upwards, however horizontal and downward extrusion processes are now becoming more common. Figure 2 shows a schematic of the set-up for blown film extrusion. This procedure consists of four main steps: The polymer material starts in a pellet form, which are successively compacted and melted to form a continuous, viscous liquid. This molten plastic is then forced, or extruded, through an annular die. Air is injected through a hole in the center of the die, and the pressure causes the extruded melt to expand into a bubble. The air entering the bubble replaces air leaving it, so that even and constant pressure is maintained to ensure uniform thickness of the film. The bubble is pulled continually upwards from the die and a cooling ring blows air onto the film. The film can also be cooled from the inside using internal bubble cooling. This reduces the temperature inside the bubble, while maintaining the bubble diameter. After solidification at the frost line, the film moves into a set of nip rollers which collapse the bubble and flatten it into two flat film layers. The puller rolls pull the film onto windup rollers. The film passes through idler rolls during this process to ensure that there is uniform tension in the film. Between the nip rollers and the windup rollers, the film may pass through a treatment centre, depending on the application. During this stage, the film may be slit to form one or two films, or surface treated. Advantages Blown film generally has a better balance of mechanical properties than cast or extruded films because it is drawn in both the transverse and machine directions. Mechanical properties of the thin film include tensile and flexural strength, and toughness. The nearly uniform properties in both directions allow for maximum toughness in the film.
Blown film extrusion can be used to make one large film, two smaller ones, or tubes that can be made into bags. Also, one die can make many different widths and sizes without significant trimming. This high level of flexibility in the process leads to less scrap material and higher productivity. Blown films also require lower melting temperatures than cast extrusion. Measured at the die opening, the temperature of cast film is about 220 C, where as the temperature of blown film is about 135 C. Furthermore, the cost of the equipment is approximately 50% of a cast line.

Blown Film Extrusion Disadvantages Blown film has a less effective cooling process than flat film. Flat film cooling is done by means of chill rolls or water, which have significantly higher specific heat capacities than the air that is used in the blown film cooling process. The higher specific heat capacity allows the substance to absorb more heat with less change in the substance temperature. Compared to cast film, blown film has a more complicated and less accurate method to control film thickness; cast film has a thickness variation of 1 to 2% versus the 3 to 4% for blown film. The resins used for casting typically have a lower melt flow index, which is the amount of polymer that can be forced through a standard die in 10 minutes according to a standard procedure. The melt flow index for cast film is about 5.0 g/10 min where as for blown film it is about 1.0 g/10 min. Consequently, the production rates for cast film are higher: cast film lines can reach production rates of up to 300m/min where as blown film lines are usually less than half this value. And finally, cast film has better optical properties, including transparency, haze, and gloss.

Common Problems Air entrapment between film layers and rollers – this may cause film scratching or wrinkling, or processing problems when winding up the film due to reduced friction. Possible solutions to this is using a vacuum to remove entrapped air or by using winding rolls with a diamond shaped groove in the rubber cover to increase surface area and decrease amount of entrapped air in the film. Large output fluctuations from the die – this causes thickness variations, and can be prevented by keeping the extruder clean and by using more consistently shaped pellets in the extruder. Melt fractures – these appear as roughness or wavy lines on the film surface, and can be eliminated by lowering the viscosity of the polymer melt. This can be done by increasing the melting temperature or by adding an internal lubricant to the material composition. Thickness variations in the film – this can be avoided by centering the die in the extrusion line before every run, adjusting the air speed of the cooling system, or by using heated die lips. Die lines on the surface of the film – this defect reduces the aesthetic appeal of the film, reduces optical properties, and weakens mechanical properties such as tear strength. This can usually be avoided by routinely cleaning the inner surfaces of the die and by refinishing scratched or roughened flow surfaces. Gels – these defects are small, hard globules encapsulated in the film or stuck on the film surface and reduce the aesthetic appeal of the film and cause stress concentration points which may result in premature failure. These are caused by overheating to the point of polymer degradation in the die, and can therefore be avoided by cleaning the inner surfaces of the die on a regular basis. Optimization of the Process Coextrusion One way to improve the line efficiency of blown film extrusion is to implement coextrusion. This is the process of extruding two or more materials simultaneously through a single die. The orifices in the die are arranged such that the layers merge together before cooling. This process saves time because it extrudes two or more layers at the same time, and it provides a method with fewer steps to produce multilayer films. The production rate for a coextruded multilayer film of three layers is about 65m/min, and the production rate for a single layer of blown film is about 130m/min. Thus, in order to produce 10 000m of a three layer multilayer film, it would take almost 4 hours using a single layer blown film process, and only 2 and a half hours using the coextrusion process. Furthermore, the film produced from the single layer process would require an extra step to glue the layers together using some sort of adhesive. Coextrusion is the least expensive means of producing layered films and the coextrusion system is capable of quick changeovers to minimize production line down time.

Minimizing the Melt Temperature
The efficiency of blown film extrusion can be improved by minimizing the temperature of the polymer melt. Reduction of the melt temperature causes the melt to require less heating in the extruder. Normal extrusion conditions have a melting temperature at about 190 C despite the fact that the temperature of the melt only needs to be about 135 C. However, it is not always practical to decrease the melting temperature by that much. By decreasing the melt temperature 2 to 20 C, the motor load can be decreased by about 1 to 10%. Furthermore, reduction of the melt temperature causes less need for cooling, so there is a reduced use of the cooling system. Moreover, removing heat from the bubble is usually the rate-limiting factor in this extrusion process, so by having less heat in the polymer to remove, the rate of the process can be increased, thus yielding higher productivity. A way to maintain the melt temperature at a minimum is to choose an extruder that is matched to the specific processing conditions, such as the material of the melt, pressure, and throughput.

Heated Extrusion Die Lips
Typically, solutions to melt fractures involve decreasing the output or increasing the melt temperature to decrease the shear stress in the extruder. Both of these methods are not ideal because they both reduce the efficiency of the blown film line. Heated extrusion die lips can solve this problem. This targeted heating method allows for film extruders to be run at higher production rates with narrower die gaps while eliminating melt fractures. Direct heat is applied to the surface of the polymer melt as it exits the die so that viscosity is reduced. Therefore, melt fractures, which are caused when trying to extrude too much of the polymer at one time, will no longer act as a limiting factor to increasing the production rate. Furthermore, heated die lips use less energy than increasing the melting temperature because only the surface of the melt is heated and not the bulk of the liquid. Another benefit of using heated die lips is that thickness variations can be controlled by adding heat to certain areas along the die circumference to make the film at that position thinner. This would ensure that no excess material is used.
Determine how much energy each of these processes can save per given volume of material. 

Above article from www.appropedia.org

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What You Ought To Find Out About Baseball

When you find yourself trying to learn how to play far better baseball, you must be ready to accept persistently learning new techniques and basic principles. Each time you improvement in the stands, there will always be requirements established and new strategies to learn. So, in essence you could always understand something. This information is in this article to teach you with a few helpful suggestions to higher your activity.

If you are searching to become a much better baseball gamer, it is very important get in good condition. Baseball entails possessing stamina, in addition to power in your biceps and triceps and legs. When you are in poor condition, it is going to be challenging to swing the bat with strength and operate the bases. Physical exercise as much as you are able to, even just in the off of-year.

Practice your protection. Certain pitching and batting get each of the glory, but becoming a fantastic protective gamer is worth just as much in your staff. The cabability to save a operate is equally as beneficial as the capability to produce a run. Equally are needed to acquire ball games.

Make sure you utilize the appropriate traction when striking a baseball. You need to opt for a “common” traction. The middle knuckles of your own fingers needs to be on the bat. Be sure the bat is across the callus line of your fingertips rather than rear of the palms. This hold betters quickness and bat speed.

Batting safety helmets are essential for safety. They guard against the potential of risky mind injuries. The very best headgear have shields that defend the facial area way too.

Many baseball athletes choose to dress in baseball mitts when batting. These baseball hand protection assist athletes grasp the bat properly and aid take in the vibrations that take place when the golf ball arrives in touch with the bat. Baseball mitts also help protect baseball players from developing calluses on his or her fingers during extensive methods and video games.

The bat perspective is important in baseball. The bat has to be about 45-diploma position using the button of that particular bat directed to the reverse batter’s box. All correct swings start off here, irrespective of their starting position. It is because the bat is with the pitched ball’s plane. Unneeded motions are prevented throughout swings through this commencing bat position.

Steer your team with hustle. Your teammates should consider looking for your needs as a model and try to imitate your work ethic. Those who lead by illustration have a more robust existence from the clubhouse. Aim to be that sort of individual who other folks turn to like a big difference manufacturer.

Should you be an initial foundation instructor, you may have a number of obligations. Fundamentally, you need to let the batter to hustle along the initial standard on all infield strikes. You will also have to remind the runners with regards to the amount of outs there are. You have to instruct the runner after it is time ti take an extra base, round first bottom or last. You might also need to inform runners how far they ought to continue pop flies.

Don’t enable a dropping streak be able to you. Dropping streaks occur in every single sport, but also in baseball good fortune can enjoy an extremely large aspect on virtually any day. Dropping streaks might be extended more than several games. Never ever let it get you down. Technique each online game by having an oxygen of self-confidence and very quickly you’ll defeat that decline.

Appropriate stride is crucial in baseball. If you’re right-given, utilize your still left leg to buy it a lttle bit as soon as the pitch is unveiled. In the event you bat still left-given, you will lift your appropriate lower leg. As the soccer ball becomes nearer, move in about 12 in . to the pitcher. Stride shorter if you’re not so major.

To assist you stay focused on the ball when jogging to it, run using your tiptoes. Should you manage and let your hindfoot to hit the soil, you can expect to bottle the body. This jarring is likely to make the eyes drop pinpoint the ball. To hold this from taking place operate on your tiptoes.

Befriend your group even after practice. To be a real tennis ball team, you must locate popular ground with everyone about the team. You need to develop real friendships. So find time to go to the movies together, or pick up a number of pieces or pizzas or a burger. The friendships you create will translate on the industry.

If you are pitching, you need to do not forget that a tennis ball is recognized as in enjoy when it really has been launched. Many times it goes into the catcher’s glove then silently back. However, you must enjoy shield in case the mixture makes contact, which regularly demands quick reflexes to avoid harm’s way.

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Are you presently now ready to perform some baseball together with your group? Utilizing the recommendations you’ve check out out there with you around the discipline will assist you to perform a far greater game. Your teammates are depending on you in addition to your instructor, and you just may make that enjoy that everyone looks at following the game.

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How one chat bot totally changed my opinion of bots

A couple of weeks ago, together with Sorted MGMT and Hardwell, we launched a messenger bot. Why did we launch the messenger bot? Originally, it was because Sorted Management approached us and asked us to build one. We’re big fans of Hardwell in the WMAS crew, in fact Tom, is probably one of his biggest. So we naturally jumped at the chance.
I’ll admit it, I was a naysayer. – “What’s the point in chat bots?” – “You’re just duplicating the information anyway.” – “I can find the information from Hardwell’s website when I want it.” I don’t get it.
Correction… I didn’t get it. And that’s fine. I’m an adult, I’m 30 now. I’m not a “millennial”… Well according to Pew Research Center I am, thanks Pew…
I use Facebook. I use twitter. I occasionally dip into WhatsApp, and sure I use Messenger to stay in touch with friends.
I don’t use snapchat, well, I have an account. But I really don’t get it, and that’s fine, I don’t need to get it.
When I was a teenager, I used to use MSN Messenger, ALL THE RUDDY TIME. I also used to send *all* of the text messages. I don’t now. I’m old(er) and wiser / grumpier.
We launched the bot. We watched all the conversations happen in real time. People were using it! IN THEIR BUCKET LOAD. We know that kids don’t use Facebook in the same way as we use Facebook. We also have to realise they use tools in other ways too. Messenger apps… This is where these kids “live”.
| They do all of their communications in private.
Why is that? Because they’ve got sensible parents giving them sensible advice. They do all of their communications in “private”. (I’m not getting into a “Facebook own your data” debate).
We’ve started to compile a handy list of articles all around bots. What are chat bots and how do they work?.