Appeal No. 1997-1282
Application No. 07/839,369
material sufficient to cause interply separation whereby said
printed facestock is separated for recycling of said substrate
stock uncontaminated by said ink or inks.
30. A combined manufacturing and recycling or reclaiming
method for labelling plastic substrates by bonding plastic
labels thereto and then recycling the substrate stock without
contamination by label inks, comprising the steps of providing
multiple charges of film-forming resin, coextruding and hot-
stretching said charges to thereby form a construction in the
form of a multilayer coextrudate consisting of two plies each
comprising one or more film layers without biaxial stretching
of either ply, preselecting the charges and layers for the
coextrusion step to provide two adjacent layers of different
compositions each identified with its own one of said two
plies and both together capable of (1) adhering to each other
during label manufacture and application steps which include
facial printing, die-cutting and affixation with heat of
labels formed from said coextrudate to substrates, and (2)
separating from each other when subjected to separation forces
greater than those experienced during said label manufacture
and bonding steps, and further selecting the charges and
layers for the coextrusion step to provide within one of said
film plies printable label facestock including a printable
face layer in the absence of any ply-included layer of
pressure-sensitive adhesive supporting said printable face
layer, the other of said two film plies comprising a heat-
activatable adhesive layer that is a contaminant-free
material, providing substrates to be labelled and performing
said label manufacture and bonding steps using said multilayer
coextrudate whereby said labels are made and bonded to said
substrates, and subsequent to said bonding, imposing said
greater separation forces to separate the printed faces of
said labels from the remaining portions of said labels and
from said labelled substrates to thereby provide substrate
stock uncontaminated by label inks, and remelting said
uncontaminated substrate stock and forming new substrates
therefrom.
According to page 5 of the specification, the hot-stretched
coextruded label stock is described in U.S. Application
3
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