Automatic T-shirt bag making machineis applied to manufacturing and printing the uncolored vest bags made of HDPE, LDPE roll film. It adopts PLC control, double step motor fixed length and the liquid crystal touch screen actual display to finish the feeding, sealing, cutting, punching holes and transporting only in one process. It is of high degree of automation and good economic result. Automatic T-shirt bag making machine control by PLC,with two photocell,two lines,speed 150-250 piece per minute for one line.
Weight of machine:1400kg;1600kg; Overall dimensions:6000*1400*1600mm;6000*1600*1600mm;
China Kingdom Machine Co., Ltd. Is a well established company in the manufacturing of a wide range of plastic bag machine including nylon film blowing machine,nylon plastic bag making machines,flexographic printing machine,rotogravure printing machine,stretch film machine,bubble film machine,recycle machine,straw making machine and other plastic machines.
“Kingdom” production team have over 15 years produce experience,most of our machines export to Nigeria,south africa,iran,dubai,southamrica,Chlie,brazil,Colombia, Argentina,Peru,Venezuela,Uruguay,Surinam,mexico,Egypt,iran,Isrel,bahrain, Cyprus,Iraq,Jordan,Kuwait,Lebanon,Oman,Qata,Saudi Arabia,Syria,Turkey and other parts of the world. “Kingdom” insists to make machines with simple design, guest first.
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; email@example.com; Whatsapp/Viber/Tango:+86-13088651008 Skype:Kingdombillwang Ruian Economic Zone,Wenzhou,China 325200
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.AdvantagesBlown 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 DisadvantagesBlown 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 ProblemsAir 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 CoextrusionOne 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 TemperatureThe 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 LipsTypically, 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.
All the Beauty and Serenity Found in Nature in Your Own Garden
A garden is a thing of beauty and a balm to the soul. Coming home, you can relax in your garden. You can relax, sit on your favourite chair, dismiss all the day’s worries and apprehensions, the problems and disappointments and be renewed. After you are refreshed, your mind will be better conditioned for the new day ahead – its problems and opportunities.
However, your lawn needs proper care and maintenance if you want to maintain its beauty and good health. It would be too much work and involve too much time if you were to do this, yourself. Truth is, you could even do more harm than good to your garden. No, You need someone who knows about lawn maintenance to care for your lawn.
Yes, some expense will be involved but a well-maintained lawn adds value to any property. In the event that you should decide to sell your property in the future, it can more easily be taken off your hands and in much less time it takes to sell other properties that don’t have a garden.
The lawn expert’s advice can actually save you money because he knows his business. On the advice of your lawn expert, your landscaping can effectively hide unwholesome views, reduce noise and optimize the beauty of your surroundings. Trees and flowers can salve your anger and fears. Certain plants can help to reduce your cooling and heating expenses.
Correct maintaining is not just watering and occasionally weeding your lawn. The pH levels of the soil should be checked. Its nutrient content is maintained, water is properly drained and pests are controlled. Sprinklers should be placed where they can best do their work and trees need to be trimmed correctly. A lawn expert will know in which section of your lawn a tree can best thrive and where grubs are most likely to be found. He will know when is the best time to plant, to prune and to aerate.
There is right way of mowing grass. When you cut grass too short, it will be damaged and weakened. Grass is harmed when it is mowed during the day or when it is still wet. Yes, plants and grass feel and get sick, too, just like you and me. When you run over the same grass repeatedly, they will die.
The soil should be aerated. Aerating ensures the easy flow of water that also helps the earthworms in keeping the soil healthy.
Grubs and insects need to be controlled, as well. But there is a correct and recommended procedure that will do the job.
Mulching helps to keep your lawn healthy. Erosion can be reduced by adding topsoil.
Good irrigation does not supply more than enough water. Sprinklers can distribute water evenly and be turned on and off, automatically.