Note: Claims are shown in the official language in which they were submitted.
Embodiments of the invention in which an exclusive
property or privilege is claimed are defined as follows:
1. The method of continuouly extruding a profile
plastic film, comprising the steps of: extruding heated
plastic into a continuous length of film with shaped pro-
file means on the surface, cooling the film by engagement
with a chill surface at the surface of the film opposite the
profile means, directing a first flow of coolant fluid
against the profile means at one location, and subsequently
directing a second flow of coolant fluid against the profile
means at a second location downstream relative to said first
location.
2. The method of continuously making a profile
plastic film, comprising the steps of: extruding a heated
plastic material into a continuous length of film with
shaped profile means on the surface comprising a female
profile at one location on the film and having a groove
and a male profile at a second location on the film and
having a projection of a size and shape to releasably inter-
lock with the female profile, cooling the film while in
engagement with a chill surface on the surface of the film
opposite the profile means, directing a first coolant fluid
at the female profile to remove heat therefrom, and directing
a second coolant fluid at the male profile downstream from
the first coolant fluid with respect to the direction of film
travel so that the female profile has heat removed there-
from in advance of the male profile.
3. The method of continuously extruding a profile
plastic film, comprising the steps of:
extruding heated plastic into a
continuous length of film with shaped profile means on the surface, cooling
the film by engagement with a chill surface at the surface of the film
opposite the profile means, directing a first flow of coolant fluid
against the profile means at one location, subsequently directing a
second flow of coolant fluid against the profile means at a second
location downstream relative to said first location, said profile means
including a female profile having a groove and having side legs, and
directing the coolant simultaneously against the inner surfaces of the
legs within the groove and also directing coolant against the outer
surfaces of the legs to simultaneously cool the inner and outer surfaces
of the female profile.
4. The method of continuously extruding a profile plastic film,
comprising the steps of: extruding heated plastic into a continuous length
of film with shaped profile means on the surface, cooling the film by
engagement with a chill surface at the surface of the film opposite the
profile means, directing a first flow of coolant fluid against the profile
means at one location, subsequently directing a second flow of coolant
fluid against the profile means at a second location downstream relative
to said first location, providing flange means alongside the profile means,
and directing a flow of coolant against the flange means for removing
heat therefrom.
5. A method according to claim 4, wherein said profile
means comprise a female profile at said one location and a male profile
at said second location, providing said flange means as laterally
extending flanges along each of said profiles, and directing coolant flow
against both of said flanges for removing the heat therefrom.
6. A method according to claim 1, 3, or 4, wherein the profile
means includes a male profile having angled outer surfaces, and directing
coolant from separate nozzles respectively
towards said surfaces.
7. A method according to claim 1, 2, or 3, com-
prising extruding a layer of film and positioning such layer
in face-to-face engaging relationship against the surface
on the extruded length of film opposite the profile means,
engaging said layer of ilm against the chill surface and
removing heat from the layer of film and also heat conducted
through said layer to the chill surface from the continuous
length of film which has the profile means thereon.
8. A method according to claim 1, 2, or 3, com-
prising moving the film vertically downwardly away from
extruding means, and directing the coolant fluid in an
angular direction against the profile means.
9. A method according to claim 1, 4, or 5, which
comprises applying said first flow of coolant fluid as liquid
coolant and said second flow of coolant fluid as coolant air
against the same profile of said profile means.
10. A method according to claim 1, 2, or 3, wherein
the profile means comprise a female profile having inner
surfaces and outer surfaces, and directing said coolant fluid
from means to said inner surfaces and from other nozzle
means to said outer surfaces.
11. A method according to claim 1, 2, or 3, wherein
the profile means comprise a female profile having inner
surfaces and outer surfaces, and directing said coolant fluid
from a pair of nozzles to the inner surfaces, and from
another pair of nozzles to the outer surfaces of the female
profile.
12. A mechanism for continuously making profile plastic
film comprising, in combination: extruding means for extrudin
heated plastic material into a continuous length of film with
shaped profile means on the surface, a chill surface positioned
to be engaged by the film on the surface opposite the profile means
to remove the heat from the film, a first coolant supply means
positioned to direct coolant against the profile means at one
location, means for supplying coolant to said first coolant supply
means, a second coolant supply means positioned at a second location
to direct coolant against the profile means in downstream relation
to said first location, and means to direct coolant to said second
coolant supply means.
13. A mechanism according to claim 12, comprising
directing the coolant, at both of said locations, against one profile
of said profile means.
14. A mechanism for continuously making profile plastic
film comprising, in combination: extruding means for extruding
heated plastic material into a continuous length of film with
shaped profile means on the surface, a chill surface positioned
to be engaged by the film on the surface opposite the profile means
to remove the heat from the film, a first coolant supply means
positioned to direct coolant against the profile means at one
location, means for supplying coolant to said first coolant supply
means, a second coolant supply means positoned at a second
location to direct coolant against the profile means in downstream
relation to said first location, said profile means comprising a
female profile having a groove and a male profile having a
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projection of a size and shape to releasably interlock with the
female profile, said female profile being located at said one
location and said male profile being located at said second location,
and the directing of coolant to said female profile ahead of said
directing of coolant to the male profile assuring substantially
equalized cooling of the profiles in the continuous advance of the
plastic profile film.
15. A mechanism for continuously making profile plastic
film comprising, in combination: extruding means for extruding
heated plastic material into a continuous length of film with
shaped profile means on the surface, a chill surface positioned
to be engaged by the film on the surface opposite the profile means
to remove the heat from the film, a first coolant supply means
positoned to direct coolant against the profile means at one
location, means for supplying coolant to said first coolant supply
means, a second coolant supply means positioned at a second
location to direct coolant against the profile means in downstream
relation to said first location, means to direct coolant to said
second coolant supply means, forming said profile means as
a female profile to be cooled at said first location and a male
profile to be cooled at said second location, and the coolant
supply means at said first location positioned to direct coolant
onto the female profile with the coolant directed to engage the
outer surface of the female profile outside of the groove and to
also direct coolant to engage. the inner surface of the female
profile inside of the grooves so as to engage the surfaces on both
sides of the groove.
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16. A mechanism according to claim 12, 14, or 15
wherein the film moves vertically downwardly away from the
extruding means and at least one of said coolant supply
means directs coolant in an angular direction against the
profiles.
17. A mechanism according to claim 12, 14, or 15,
wherein at least one of said coolant suppy means includes
a plurality of jet openings directing streams of coolant
against the same profile of said profile means.
18. A mechanism according to claim 12, 14, or 15,
wherein the profile means includes a female profile having
legs defining an inner groove with a plurality of surfaces,
at least one of said coolant supply means including four
jets, with a separate jet directed at each of the outer sur-
faces of the legs of the female profile, and with a separate
jet for directing a stream of coolant at each of the inner
surfaces of the groove.
19. A mechanism according to claim 12, 14, or 15,
wherein said chill surface is a cooled rotating roll.
20. A mechanism according to claim 12, 14, or 15,
wherein the profile means includes a male profile having
divergent outer surfaces, and at least one of the coolant
supply means including a plurality of nozzles one of which
is directed toward one of said male profile surfaces and
another of which nozzles is directed toward the other of
said male profile surfaces.
21. A mechanism for continuously making profile
plastic film comprising, in combination: extruding means
for extruding heated plastic material into a
continuous length of film with
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shaped profile means on the surface, a chill surface positioned
to be engaged by the film on the surface opposite the profile means
to remove the heat from the film, a first coolant supply means
positioned to direct coolant against the profile means at one
location, means for supplying coolant to said first coolant supply
means, a second coolant supply means positioned at a second
location to direct coolant against the profile means in downstream
relation to said first location, means to direct coolant to said
second coolant supply means, said profile means comprising
male and female profiles, which are interlockable and with extruded
flange strips outwardly of the profiles, and coolant supply means
positioned outwardly of at least one of the profiles and directing
a separate supply of coolant against the flange strip outwardly of
said one profile.
22. A mechanism according to claim 21, comprising
means for directing separate supplies of coolant against both
of the flange means.
23. A mechanism according to claim 12, 14, or 15,
including second extruding means for extruding a layer of film
which is positioned in face-to-face engaging relationship with the
first length of film which has the profile means thereon, and said
layer of film engaging said chill surface so that heat is removed
therefrom and heat is conducted through said layer to the chill
surface from the film having said profile means thereon.
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