Drinking straw machine extrusion

Drinking Straw Making Machine data
drinking straw machinePP drinking straw

Polypropylene Drinking straw making machine extrusion have 1 color, 2 colors,3 colors,4 colors,5 colors
drinking straw diameter from 3mm to 15mm.
Suit market:Drinking bar,milk drinking straw,cocktail stir straws,cocktail drinking straws,cofa bar,Lollipop.

This model is a tube extrusion line, composed of extruder and die ,Vacuum calibration and cooling unit,haul-off unit, rotary cutter unit, The series machines can produce all kinds of drinking straw,spiral strip straw,medical pipe, all the machine’s controls base with the control elements ergonomically adapted to permit easy operation.

TECHNICAL FEATURE

1.The extrusion die can be special designed and easy exchanged to produce pipe and shaping stuff,
2.Water bath in stainless steel can be adjusted in three planes ,
3.The haul-off unit can be belt or rollers, it is customizable.
4.Fitted with single or double rotary cutter .


Video of drinking straw making machine
Kingdom Machine Co.,ltd
Tel.:0086-577-66881211;      Fax:0086-577-66881311
Mobile:0086-13088651008;       
Whatsapp:0086-13958812663;

www.kingdommachine.com;
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Ruian Economic Zone,Wenzhou,China 325200 

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Why You Need A Yoga Retreat

There are so many people that are having a really hard time in practicing yoga since they are really busy in their life. The tensions from your family and work will really make it hard for you to concentrate on yoga. That is why if you want to enjoy the right amount of serenity, you should consider getting a yoga retreat. This article will let you know more about the great benefits that you will enjoy if you will attend a yoga retreat.

You should know that a yoga center will help you enjoy a beautiful lifestyle. If you want to practice yoga with no disturbance, then a yoga center can provide you the time that you need. You will be able to pace yourself accordingly if you will consider going on weekly classes.

For a significant amount of time, you will be able to avoid the busy life schedule because of yoga classes. You can also relieve your mind and body from the stress of your everyday life. All the distractions that have been bothering you for quite some time now can now be avoided. That is why it is best for you to consider going to a yoga retreat in order for you to avoid all the stress, problems, and worries from your daily life.

Yoga can be a nice journey that will help you achieve so many things that you will not achieve otherwise. Every time you will be visiting one of the best yoga retreats out there, you will easily practice and excel in yoga. You will be able to learn new yoga techniques and enhance your self-confidence at the same time.

People sometimes would just want to avoid all the stress that they get from their hectic lifestyle. Yoga retreats are your best options that you should consider if you really want to enjoy a healthy lifestyle. Take note that yoga retreats are really sensitive but can really change your life so it is important for you to really get great results from this venture.

A lot of the yoga retreats are located in very nice places so you can make sure that you and your partner will always plan on coming back every time you will go to a yoga retreat.

After you will experience a yoga retreat, you can easily go back to your normal life and make better decisions. You will easily manage everything because you will really have a superior mindset.

Those are some of the great benefits that you will really enjoy if you will consider attending a yoga retreat. This article will really help you make the right choices when it comes to the topic of a yoga retreat. You just need to keep your options open every time while also getting great results at the same time. A yoga retreat will really let you enjoy yourself. Click here for more info about a yoga retreat.

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Everything You Need To Know About Sports Medicine

These days, one of the greatest fears among athletes and sports enthusiasts is having sports-related injury because ones an athlete is injured, such injury could stay with him for a lifetime. One great example for this are runners who might have a higher tendency of having their knees injured or their ankle sprained. But thanks to sports medicine, there is no need for you to worry about this problem anymore.

Playing sports may be fulfilling for some most especially to the athletes but do you know that there is also a great risk that comes with it as well since you are also becoming prone to getting an injury? One great example of this is when you are playing basketball and you have a higher risk of getting a sprain and having a hand injury most especially if there is a rough play on your games. There are also other types of sports where you really need to make sure that you are extra careful because even your slightest mistake can leave you with a broken bone or an injured muscle. Yet there nothing for you to worry about the injuries that you may incur during your games because even though these injuries may be serious, there is still a good chance that you can have them treated well with sports medicine. There are healthcare professionals these days who specialize in sports medicine which is why there is no need for you to worry if you have broken a bone because they are here to help you out.

But when you speak of sports medicine, it is not only about treating existing sports-related injury because you can also use sports medicine to prevent injuries from happening. One great example of these are sports medicines made available for athletes to help them keep up with their body’s stamina, endurance and strength to keep their body in good condition for their games. Energy drinks for instance are a part of sports medicine because it helps you condition your body when you are actually playing your sport so that you will be able to lessen your chances of getting injured. If you want to make sure that you will never have a hard time sustaining your body as an athlete, one of the best options available for you is to use energy drinks and specially formulated water which provides you with all the nutrients and energy to keep going with your physical activities. If you think that the normal water would supply the sweat you shed during your training or your actual game, you might want to think again because the truth is, you need more nutrients to supply your body and you can only get them with the right application of sports medicine.

Click here now if you wish to know more about sports medicine and the many benefits that you can get from it.

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Tips for Slowing Down Your Relationship Without Breaking Up

Probably, you were feeling a kind of rush when you began that new romance and such can feel really addictive. You do have such excellent chemistry and then you would find yourself wanting to spend such free time together. However, there is something that took place. The initial fireworks may have already went down that you now want to step back. Or perhaps, she begins to become more serious than what you actually intended. You may like to slow down in your relationship but you don’t want to lose her too. What must you do?

The first thing to do is that you should think it over and you need to be honest with yourself. When your interest in her has waned but you are still hanging in there, then you should be asking yourself why. Is this to spare her feelings? Or is it due to the reason that she is actually a great girl though you are not feeling quite right? Perhaps, you also have fun with such physical chemistry though there is no intellectual or emotional connection? It is about time for you to be brave when the answer to these questions is a yes and you should be doing the right thing. You need to have that honest conversation with her regarding how you feel and end things when you must. As much as you may like to hang in there and see where things would go, it is really unfair to ask her to waste her time in such relationship if you already suspect that such will go to a dead end.

But, when your interest in her has not faded, but you just want to have a breather, then you may get on a more solid ground or avoid damaging that excellent relationship through moving really fast. You need to have that more mature approach so that you can save the relationship rather than end such. There are many promising relationships that end because the parties which are involved got really emotionally or physically involved quite fast and also the passion burns out before they would have that chance to build something sustainable and solid.

It is essential that you must talk it out. You need to be clear so that you can avoid those misunderstandings. You must assure her that you do like her and that you also value the relationship and you don’t like seeing other people. You are only uncomfortable with the present pace of the relationship and you want to take the things more slowly. When your partner is able to understand this, then it would be great. If not, then you have to try to meet somewhere in the middle.

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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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