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Shrink Film for Bundling Multiple Objects

IP.com Disclosure Number: IPCOM000242108D
Publication Date: 2015-Jun-18
Document File: 6 page(s) / 125K

Publishing Venue

The IP.com Prior Art Database

Related People

Nilesh C Shah: AUTHOR [+4]

Abstract

The invention relates to a film structure produced on monolayer or multilayer machine combining a metallocene-rich layer, low density polyethylene (LDPE) and high density polyethylene (HDPE). The structures of the invention are particularly useful for collation shrink film.

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Page 01 of 6

Shrink Film for Bundling Multiple Objects

The  invention  relates  to  a  film  structure  produced  on  monolayer  or  multilayer  machine  combining  a  metallocene‐rich  layer,  low  density  polyethylene  (LDPE)  and  high  density  polyethylene  (HDPE).    The  structures  of  the  invention  are  particularly  useful  for  collation  shrink film. 

Collation shrink film is wrapped around multiple objects, with or without a cardboard base  and shrunk around containers.  Collation shrink film needs to have an optimum bull's eye  size on a consistent location for each package to ensure a snug fit.  The packaging must also  have excellent display/optical properties including gloss (preferably under different angles  to  maximize  appeal),  haze  (or  contact  clarity),  and  clarity  (or  see  through  clarity).   Additionally,  collation  shrink  film  must  have  enough  thermal  shrinkage  force  to  ensure  a  tight fit to withstand rigorous handling and abuse during transportation and through the life  cycle of the package. 
 

To  obtain  excellent  optical  properties,  manufacturers  need  to  use  a  combination  of  multilayer  machinery  and  certain  polymer  formulations  to  satisfy  certain  application  requirements.  A wide variety of multiple objects such as water bottles or carbonated soft  drink bottles or other drinks or food items are packed together using collation shrink film. 
 
EP 1529633A1 describes a film formulation having at least two layers: skin layer and core  layer including a metallocene polyethylene (mPE) blend with LDPE or HDPE. 
 
WO01/44365 describes a homogeneous blend of a metallocene catalyzed medium density  polyethylene (mMDPE) with LDPE to produce collation shrink film. 
 
Previous works do not address challenges or problems associated specifically with the South  Asian markets. 

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