Featured Stories
UV/EB | North American Market for Energy Curing Technologies
PRIMIR study provides the latest word on ultraviolet and electron beam curing in printing.
Read moreCarton Decorating | Cold Foil Makes Packaging Pop
Ellis Paperbox added Eagle Systems' cold foil unit to a new Komori press, pleasing customers looking for shine at an affordable price.
Read moreCoating Matters | Pump Technology
Fluid preparation and delivery may be ancillary to the coating process, but they are critical to the coating outcome.
Read moreShow Preview | ICE USA 2015 Returns to Orlando with Added Features
PFFC's "Static Beat" columnist Kelly Robinson is part of expanded "Ask the Experts" program. Kelly and "Coating Matters" columnist Mark Miller present at CEMA …
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News | New Products
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NeuDrive Acquires Portfolio from CPI Innovation Services
Acquisition includes organic semiconducting material patents and FlexOS trademark, plus licenses relating to organic thin-film transistor technology
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Spartanics Launches Laser Die-Cutting Module
The X-350 laser die-cutting module can be integrated with converting solutions from Smag Graphique
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Green Bay Packaging Wausau Celebrates 50th Anniversary
Manufacturer of corrugated containers, displays, and more sells to many industries and reportedly has a history of innovation in packaging
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Color-Logic Issues Certification to Epson
Company has certified the Epson SurePress L-4033AW with iSi MaxPrint RIP supports file formats required to produce the Process Metallic Color System
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Glenroy Acquires PF Flexibles
The acquisition is expected to allow Glenroy to provide customers with high-quality stand-up pouches
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Cortec Corrosion Inhibiting Films Are Made to Order
EcoCortec VpCI films and bags, available in custom sizes and shapes, are said to offer strong protection for metal parts
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FTA Announces Custom Branded Book Program
Program allows companies to personalize FTA books with their logos as gifts to customers, prospects, etc.
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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 Tim's Web Lines to handle and wind your paper, film, foil, and similar products. Take advantage of Tim’s 25+ years just like over 100 converters have.
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 Marketing Mojo for dynamic marketing insights from Stephanie Millman that inspire new ideas on how to stay on top of your customer’s mind.
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Visit Yo’s Yarns to share the thoughts, impressions, experiences, and news that impact the converting industry. . . or anything else that happens to be on her mind!
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.