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Show Preview | NPE2015 Boasts Its Largest Event Ever
At well over 1 million sq ft and growing, the triennial plastics showcase will have operating equipment at 400+ booths.
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PFFC's "On Print" columnist Dene Taylor will present educational session on packaging.
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The fundamentals of air entrainment, entrapment, and rheology are critical to product success.
Read moreBarrier Resins | Properties, Processing & Handling of EVOH, Pt. 1
The high barrier performance of EVOH, even after abuse, has allowed for conversion from foil and metallized film laminations to co-extruded barrier films.
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News | New Products
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Packaging Films Target Longer Shipping, Storage Cycles
Patent-pending films developed by Pregis for inflatable cushioning applications
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Polymax Materials Suited for Sensory-Sensitive Applications
Thermoplastic elastomers are said to protect the freshness, quality, and safety of food and beverages
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Pregis Marks Ten years in Business
The company has had a busy and productive decade as a supplier of protective packaging solutions
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PPC Spring Meeting to Address Risk Taking
An impressive array of speakers also will address economic trends, building winning organizational cultures, and more
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Spear Introduces P-S Label for PET Bottle Recycling
SpearRC developed to offer PET bottle the benefits of pressure-sensitive labels
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INX Moves Into New Facility in Ohio
Operations have begun at the new manufacturing plant in Lebanon, OH, which will specialize in solvent ink production
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Inca Digital Launches Flatbed Printer
The Onset R40LT wide-format printer is said to offer flexibility for different types of printing needs
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Visit Kelly on Static from Static control expert Dr. Kelly Robinson, president of Electrostatic Answers; Kelly has 27+ years of experience in problem-solving and consulting.
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Visit Mark's Coating Matters from fluid coating expert Mark D. Miller; Process improvement and project management for precision roll-to-roll coating applications.
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Visit Tom's Poly Ploys, where Tom will be writing on various topics that the typical polymer processor would encounter on the job.
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Blocking in a PP/PE Blown Film Structure
- July 01, 2013
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.