Featured Stories
Web Lines | Action Plan for CD Buckles, Part 3
Web handling expert Tim Walker offers mechanisms, descriptions,a and remedies for your cross direction buckles.
Read moreShow Preview | Labelexpo Europe 2017 Is its Largest Exhibition To-Date
Show will occupy 9 halls and more than 35,000 sq meters
Read moreCoating Matters | Balancing Slot Die Design
How slot die geometry can improve flow control and reduce coating defects.
Read moreSticking With It | Overview of Radiation Curable Pressure-Sensitive Adhesives
Adhesives expert Ingrid Brase considers the benefits and drawbacks of radiation curable products.
Read more•
•
•
•
News | New Products
-
Xeikon to Show Digital Print Lineup
The company will showcase Automated Digital Print Manufacturing at Labelexpo Europe, including the 3300 press and the X-800 digital front-end
-
Pamarco Announces Anilox Roll Cleaner
CARE Wash Green is said to raise print quality and consistency
-
SPGPrints Screen Makes Packaging Glitter
RotaMesh Glitter Screen allows user to incorporate reflective inks for premium labels and packaging as well as security uses
-
Maxcess to Announce New Sensors
The SE-26B Line Guide Sensor and new DSE Digital Sensors will be launched at Labelexpo Europe
-
PCMC Acquires Graphbury Machines
The transaction brings to PCMC machinery and engineering solutions for the flexible packaging industry
-
PC Industries to Show Lineup at Labelexpo
Among the offerings will be web inspection systems for both in-line and off-line use and both wide and narrow webs
-
Demirag Announces Folder/Gluer
The DEMAK folder/gluer handles several materials and widths
White Papers
• Anti-counterfeiting Technologies for Packaging
• Hermetic-Seal Performance of BOPP Laminate Structures in VFFS Pouch Applications
• Methods and Design Considerations for the Application of Hot Melt Coatings
• Specialty Coatings to Help Packaging Stand Out in the Grocery Aisle
• BOPP Laminate Structures for “Over-the-Mountain” VFFS Pouch Applications
• How a Full Lineup of Coatings Can Transform Packaging
Expert Advice
Marketing Report How-To
Marketing Mojo Archive Stephanie Millman's Bio
Blocking in a PP/PE Blown Film Structure
- Published: Monday, 01 July 2013 08:00
He indicates no corona treating at all in the process and that the screw diameter is 60mm, the screw length is 30D, and die diameter is 300mm. Further, the PE processing temperature is 155-170C, while the PP processing temperature is 190-220C. He goes further to say that one extruder zone overshoots from a setpoint of 165C to 200C. The pricing of his film does not allow the use of slip or anti-block.
In the absence of two-side corona treating or contaminated resin, the blocking is due to inadequate cooling of the film. In essence, it is a heat transfer problem. This converter can raise the height of the cooling tower (if possible), slow down the line speed (not always desirable), or reduce the film thickness (not typically allowed). More air flow and probably better air distribution and a lower air temperature are required, in particular, a lower temperature of the mandrel for improved cooling of the inner layer is needed (since this is where the blocking occurs).
I find in many developing nations that the use of chilled air is not common, especially in fledgling companies. Cooling of the molten plastic is critical for many reasons, not the least of which is physical properties, followed closely by clarity and blocking.
I hope everyone is having a great summer.
