MTi Polyexe, Blog, blown film, base films, release liner, plastic film, silicone coatings, silicone release liner, custom coating converting, plastics films, Blown Film Extrusion

Blown Film Line

Posted by Thomas Zickell on Sun, Jun 29, 2014 @ 20:06 PM

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Tags: blown film, silicone release liner, blown film extrusion, multi-layer film

Happy Earth Day from MTi Polyexe

Posted by Thomas Zickell on Sun, Apr 22, 2012 @ 13:04 PM

Here at MTI Polyexe we want to wish you a happy Earth Day. We understand as a blown film extrusion manufacturer, silicone coating manufacturer and release liner manufacturer in today's day age it is more important than ever to understand we only have one planet thus we must keep it clean. You can count on us at MTI Polyexe to do just that along with delivery you a quality product. Thank you for taking the time to read this please look at our offerings.

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Tags: silicone coatings, silicone release liner, custom coating converting, blown film extrusion, Earth Day

About Blown Film Extrusion

Posted by Thomas Zickell on Mon, Mar 12, 2012 @ 05:03 AM

Blown Film Extrusion Click me

 

One of the most common methods of film manufacture is Blown Film (also referred to as the Tubular Film) Extrusion. The process involves extrusion of a plastic through a circular die, followed by "bubble-like" expansion. The principal advantages of manufacturing film by this process include the ability to:

  • Produce tubing (both flat and gussetted) in a single operation
  • Regulation of film width and thichness by control of the volume of air in the bubble, the output of the extruder and the speed of the haul-off
  • Eliminate end effects such as edge bead trim and non uniform temperature that can result from flat die film extrusion
  • Capability of biaxial orientation (allowing uniformity of mechanical properties)
  • Blown Film Extrusion can be used for the manufacture of co-extruded, multi-layer films for high barrier applications such as food packaging.

The Process


Plastic melt is extruded through an annular slit die, usually vertically, to form a thin walled tube. Air is introduced via a hole in the centre of the die to blow up the tube like a balloon. Mounted on top of the die, a high-speed air ring blows onto the hot film to cool it. The tube of film then continues upwards, continually cooling, until it passes through nip rolls where the tube is flattened to create what is known as a ' lay-flat' tube of film. This lay-flat or collapsed tube is then taken back down the extrusion ' tower' via more rollers. On higher output lines, the air inside the bubble is also exchanged. This is known as IBS (Internal Bubble Cooling).

The lay-flat film is then either kept as such or the edges of the lay-flat are slit off to produce two flat film sheets and wound up onto reels. If kept as lay-flat, the tube of film is made into bags by sealing across the width of film and cutting or perforating to make each bag. This is done either in line with the blown film process or at a later stage.

Typically, the expansion ratio between die and blown tube of film would be 1.5 to 4 times the die diameter. The drawdown between the melt wall thickness and the cooled film thickness occurs in both radial and longitudinal directions and is easily controlled by changing the volume of air inside the bubble and by altering the haul off speed. This gives blown film a better balance of properties than traditional cast or extruded film which is drawn down along the extrusion direction only. 
3 layer die head with air ring and internal bubble cooling Film bubble going into a collapsing frame
   
 Control panel graphic from an automated blown film line  Taking an edge trim from film web
   
 The layflat tube is separated into 2 single sheets  Blown Film Line In Action


Materials

Polyethylenes (HDPE, LDPE and LLDPE) are the most common resins in use, but a wide variety of other materials can be used as blends with these resins or as single layers in a multi-layer film structure. these include pp, pa, evoh. In some cases, these materials do not gel together, so a multi-layer film would delaminate. To overcome this, small layers of special adhesive resins are used in between. These are known as “tie layers”.

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Tags: blown film, plastic film, Polyethylene, Polypropylene, blown film extrusion, RELEASE FILMS, converting, multi-layer film

Happy New Year! From all of us at MTI Polyexe!

Posted by Thomas Zickell on Sat, Dec 31, 2011 @ 15:12 PM

MTI Polyexe Corporation wants to thank you all for giving us a great 2011. We look forward to providing more innovative products and high quality service you have come to expect from us in 2012. If you are already a customer we are grateful for your loyalty. If you are not yet a customer and are looking for a company that can save you money and time please contact us.

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Tags: blown film, base films, release liner, plastic film, silicone release liner, Polyolefins, Polyethylene, Polypropylene, TPO, blown film extrusion, RELEASE PAPERS, converting, rewinding services

How Plastics Work

Posted by Thomas Zickell on Thu, Nov 03, 2011 @ 12:11 PM

Making Plastics

To make plastics, chemists and chemical engineers must do the following on an industrial scale:

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Tags: blown film, base films, custom coating converting, Polyolefins, anti skid, blown film extrusion, RELEASE PAPERS, RELEASE FILMS, FILMS - Coextrusion, FILMS - Polyethylene, FILMS - Polypropylene, Film slitting, How plastics work

Thank You From MTI Polyexe

Posted by Thomas Zickell on Thu, Sep 08, 2011 @ 04:09 AM

MTi Polyexe Corporation would like to thank every one for taking the time to visit our site. from mtipolyexe on Vimeo.

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Tags: blown film, base films, release liner, plastic film, silicone coatings, silicone release liner, custom coating converting, anti skid, TPO, RELEASE PAPERS, FILMS - Ethyl Vinyl Acetate, Film slitting, cutting, converting, rewinding services

Thank you for making the summer of 2011 great MTI Polyexe.

Posted by Thomas Zickell on Fri, Sep 02, 2011 @ 14:09 PM

MTi Polyexe Corporation would like to thank every one for taking the time to visit our site. from mtipolyexe on Vimeo.

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Tags: blown film, base films, release liner, plastic film, silicone coatings, custom coating converting, Polyethylene, anti skid, blown film extrusion, RELEASE PAPERS, RELEASE FILMS, FILMS - Coextrusion, HDPE, LDPE, LLDPE

MTi Polyexe would like to thank you for visiting our Blog.

Posted by Thomas Zickell on Wed, Aug 24, 2011 @ 03:08 AM

MTi Polyexe Corporation would like to thank every one for taking the time to visit our site.

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Tags: blown film, base films, release liner, plastic film, silicone coatings, custom coating converting, Polyolefins, Polyethylene, anti skid, blown film extrusion, RELEASE PAPERS, RELEASE FILMS, FILMS - Coextrusion, FILMS - Ethyl Vinyl Acetate, FILMS - Polyethylene, LDPE, FILMS - Polypropylene

New Feed

Posted by Thomas Zickell on Wed, Aug 24, 2011 @ 03:08 AM

http://feeds.feedburner.com/mtipolyexe
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Awards

Posted by Thomas Zickell on Thu, Aug 11, 2011 @ 17:08 PM

Please tell use what you think of our awards.

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Tags: base films, release liner, silicone coatings, silicone release liner, custom coating converting, Polyethylene, Polypropylene, anti skid, blown film extrusion, RELEASE PAPERS