Film Front
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 Ipad 3 Gen 2nd $0.95 |
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HK3308 Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.15 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 iPad 3 Gen 2nd $0.95 |
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10 PCS Clear Front+Back Screen Cover Film FULL Protector For iPhone 4S/4 SP-iS10 $0.99 |
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6X CLEAR Front + Back Apple iPhone 4 4S 4G Full Body Screen Protector Cover Film $0.99 |
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BLACK MIDDLE WHITE SIDE HARD CASE COVER FOR APPLE IPHONE 4 4S + FRONT&BACK FILMS $7.00 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 3 Gen 3rd $0.95 |
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PURPLE RUBBER TPU CASE+FRONT MIRROR FILM for iPhone 4 4S 4G 4GS G $4.46 |
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HOT Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.15 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 2rd 3 Gen 3rd $5.51 |
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NEON PINK & WHITE 3-PCS HARD CASE COVER FOR APPLE IPHONE 4 4S + FRONT&BACK FILMS $7.25 |
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HOT Item Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.15 |
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3x Anti-Glare Front Back Screen Protector Guard Film Cover for iPhone 4 4S 4th G $4.72 |
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White & Yellow 3 PCS HARD CASE COVER FOR APPLE IPHONE 4 4S + FRONT&BACK FILMS $7.25 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 iPad 3 Gen 2nd $0.95 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 3 Gen 3rd $0.95 |
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HOT Selling Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.10 |
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6X CLEAR Front + Back Apple iPhone 4 4S 4G Full Body Screen Protector Cover Film $0.99 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 Ipad 3 Gen 2nd $0.95 |
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3X Front Clear Silicone LCD Screen Protector Film for Samsung Galaxy S2 II i9100 $3.55 |
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HUI2207 Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.10 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 iPad 3 Gen 2nd $0.95 |
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3 SETS OF CLEAR APPLE IPHONE 4 4G 4S FRONT & BACK FILM LCD SCREEN PROTECTORS $1.56 |
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NIB Wrapsol ULTRA Front & Back LCD Screen Protector Film for Apple iPhone 4 4S $29.35 |
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ULTRA THIN CLEAR HARD CASE COVER FOR IPHONE 4 4S + Front & Back Protective Films $5.49 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 3 Gen 3rd $0.95 |
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HUIY3045Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.10 |
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Black Aluminum Hard Skin Case+Front Anti-Glare Back Film for Verizon iPhone 4 4S $5.77 |
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iPhone 4S & 4 FRONT AND BACK PROTECTIVE FILMS MADE IN JAPAN ! NOT LOW QUALITY $1.56 |
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New Clear LCD Film Screen Protector Front Cover Guard for Toshiba Thrive 7 inch $3.99 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 Ipad 3 Gen 2nd $0.95 |
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LJ408 Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.11 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 iPad 3 Gen 2nd $0.95 |
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3 SETS OF CLEAR APPLE IPHONE 4 4G 4S FRONT & BACK FILM LCD SCREEN PROTECTORS $1.56 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 3 Gen 3rd $0.95 |
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6X DIAMOND Front Back Apple iPhone 4 4S 4G Full Body Screen Protector Cover Film $0.99 |
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LJD2205 Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.11 |
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Smoke TPU Bumper Case+Front Back Film for iPhone 4 4Sth 4G $4.37 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 Ipad 3 Gen 2nd $0.95 |
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New Gen Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.11 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 iPad 3 Gen 2nd $0.95 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 3 Gen 3rd $0.95 |
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Front Back Mirror Film+Black Carbon Fiber Plastic Case Cover For iPhone 4G 4S $7.19 |
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WHITE TPU CASE COVER+FRONT MIRROR FILM For iPhone 4 4S 4G 4GS G $3.09 |
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NH4405 Front & Back Iphone 4/4S Screen Protector Film w/ Cleaning Colth $0.11 |
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6X CLEAR Front + Back Apple iPhone 4 4S 4G Full Body Screen Protector Cover Film $0.99 |
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5x Front + Back Full Body Screen Protectors Guard Film For iPad 2 Ipad 3 Gen 2nd $0.95 |
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FRONT & BACK ANTI-GLARE SCREEN PROTECTOR GUARD FILM For iPhone 4S *US SHIPPING $0.01 |
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White TPU Gel Cover Case Skin for Apple iPhone 4 4G 4S + Front & Back Films $6.99 |
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6X CLEAR Front + Back Apple iPhone 4 4S 4G Full Body Screen Protector Cover Film $0.99 |
Blown Film Extrusion Line
Definition:
Blown-film extrusion can be defined as a process for forming plastic films. The Blown-film extrusion involves a molten resin extruded through a circular die and filling the tube with air. The air within the tube stretches the film to obtain the desired thickness. In this process plastic film is produced according to the desired sizes or thickness as demanded by the end customer of the packaging industry. The film blowing process basically done by extruding a tube of molten thermoplastic and repeatedly inflating the tube with air. The product can be used directly or can be sllited to form a flat film.
Find more information on : Plastic-Extrusion-Machinery.info
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.
Materials:
Polyethylene’s (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”.
Advantages
- 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)
- Very high productivity
- Permits the combination of a number of different materials and properties
Applications:
Blown film can be used either in tube form (e.g. for plastic bags and sacks) or the tube can be slit to form a sheet.
Consumer packaging (e.g. packaging film for frozen products, shrink film for transport packaging, food wrap film, packaging bags, or form, fill and seal packaging film) Typical applications include Industry packaging (e.g. shrink film, stretch film, bag film or container liners), , Laminating film (e.g. laminating of aluminum or paper used for packaging for example milk or coffee), Barrier film (e.g. film made of raw materials such as polyamides and EVOH acting as an aroma or oxygen barrier used for packaging food, e. g. cold meats and cheese), films for the packaging of medical products, Agricultural film (e.g. greenhouse film, crop forcing film, silage film, silage stretch film).
Site enhansing from : PlaceOnTop.com
About the Author
By: Shashank
Site enhansing from : PlaceOnTop.com for Plastic Extrusion Machines
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