Monthly Archives: December 2017

The Wright Wall Firm. We are one of the greatest and most well-known fence businesses close to. We innovator has more than 15 experience with wall installation.

Searching for northwest Indianapolis most top notch fence business, then your search is over. Should you ran a internet search for the keyword wood kennel area set up you’d have found us. The Wright Fencing Organization. We’re 1 of the greatest and oldest kennel area firms close to. We innovator has above 15 years of experience with kennel area installment.

fencing contractors

With remarkably competitive quotes we could have the task prepared for a good price tag and help the customer cut costs while designing a stellar inspiring kennel area for your level of privacy you would like. wooden kennel area installment is one of our most commonly known companies that individuals provide. It’s very easy to make use of our companies on all your properties.

the vynal fencing 

It is possible to phone our professional specialists and they’ve the experience to have whichever fencing you’re looking at build in mere a several nights. Allow wright wall firm do your career, obtain a honest quotation, and obtain the best privateness wall that money can buy. We provide the latest privateness walls and you will be happy to do the do the job today. So call us and expand a warm thanks for visiting our folks who will be putting in your wall today.… Read More ...

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 Read More ...

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