U.S. patent application number 17/332630 was filed with the patent office on 2021-12-09 for laminated film.
The applicant listed for this patent is Inteplast Group Corporation. Invention is credited to Peng-Jen Chen, Angel Herrera, Tom Hsiao, Frankie Lu, Hsin-Tien Tung.
Application Number | 20210379866 17/332630 |
Document ID | / |
Family ID | 1000005786947 |
Filed Date | 2021-12-09 |
United States Patent
Application |
20210379866 |
Kind Code |
A1 |
Hsiao; Tom ; et al. |
December 9, 2021 |
LAMINATED FILM
Abstract
A multi-laminate film includes a first biaxially oriented film
having a first machine direction angle and a first spiral cut
oriented film having a second machine direction angle different
than the first machine direction angle. The multi-laminate film
also includes at least one of a second biaxially oriented film
having the first machine direction angle or a second spiral cut
oriented film. The first biaxially oriented film, the first spiral
cut oriented film and the at least one of the second biaxially
oriented film or second spiral cut oriented film are laminated
together.
Inventors: |
Hsiao; Tom; (Sugarland,
TX) ; Lu; Frankie; (Port Lavaca, TX) ; Chen;
Peng-Jen; (Victoria, TX) ; Tung; Hsin-Tien;
(Edna, TX) ; Herrera; Angel; (Victoria,
TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Inteplast Group Corporation |
Livingston |
NJ |
US |
|
|
Family ID: |
1000005786947 |
Appl. No.: |
17/332630 |
Filed: |
May 27, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
63032005 |
May 29, 2020 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B32B 7/035 20190101;
B32B 2307/518 20130101; B32B 27/08 20130101; B32B 2307/581
20130101; B32B 2307/558 20130101; B32B 27/32 20130101; B32B 2307/54
20130101; B32B 2307/5825 20130101; B32B 2250/24 20130101; B32B
2307/72 20130101 |
International
Class: |
B32B 7/035 20060101
B32B007/035; B32B 27/32 20060101 B32B027/32; B32B 27/08 20060101
B32B027/08 |
Claims
1. A multi-laminate film comprising: a first biaxially oriented
film having a first machine direction angle; a first spiral cut
oriented film having a second machine direction angle different
than the first machine direction angle; and at least one of a
second biaxially oriented film having the first machine direction
angle or a second spiral cut oriented film; wherein the first
biaxially oriented film, the first spiral cut oriented film and the
at least one of the second biaxially oriented film or second spiral
cut oriented film are laminated together.
2. The multi-laminate film of claim 1, wherein the at least one of
the second biaxially oriented film or second spiral cut oriented
film is the second biaxially oriented film, the first spiral cut
oriented film being laminated between the first and second
biaxially oriented films.
3. The multi-laminate film of claim 1, wherein the at least one of
the second biaxially oriented film or second spiral cut oriented
film is the second spiral cut oriented film, the first biaxially
oriented film being laminated between the first and second spiral
cut oriented films.
4. The multi-laminate film of claim 3, wherein the second spiral
cut oriented film has the second machine direction angle.
5. The multi-laminate film of claim 3, wherein the second spiral
cut oriented film has a third machine direction angle different
than the first and second machine direction angles.
6. The multi-laminate film of claim 5, wherein the second machine
direction angle is within the inclusive range of about +30.degree.
to about +60.degree. and the third machine direction angle is
within the inclusive range of about -30.degree. to about
-60.degree..
7. The multi-laminate film of claim 1, wherein the second machine
direction angle is within the inclusive range of about +30.degree.
to about +60.degree..
8. The multi-laminate film of claim 1, wherein the second machine
direction angle is within the inclusive range of about -30.degree.
to about -60.degree..
9. The multi-laminate film of claim 1, wherein the first biaxially
oriented film, the first spiral cut oriented film and the at least
one of the second biaxially oriented film or second spiral cut
oriented film each comprise high density polyethylene (HDPE) or
linear low density polyethylene (LLDPE).
10. The multi-laminate film of claim 1, wherein the first biaxially
oriented film, the first spiral cut oriented film and the at least
one of the second biaxially oriented film or second spiral cut
oriented film each comprise two skins layers and a core layer
disposed between the two skins layers.
11. A multi-laminate film comprising: a plurality of films
laminated together, each film having a machine direction angle,
wherein the machine direction angles of at least two films of the
plurality of films are different from each other.
12. The multi-laminate film of claim 11, wherein the films of the
plurality of films are arranged such that no two adjacent films of
the plurality of films have the same machine direction angle.
13. The multi-laminate film of claim 12, wherein each film of the
plurality of films is a biaxially oriented film or a spiral cut
oriented film.
14. The multi-laminate film of claim 13, wherein the plurality of
films includes at least two biaxially oriented films.
15. The multi-laminate film of claim 13, wherein the plurality of
films includes at least two spiral cut oriented films.
16. The multi-laminate film of claim 13, wherein the films of the
plurality of films are arranged to alternate between biaxially and
spiral cut oriented films.
17. The multi-laminate film of claim 13, wherein the plurality of
films includes three to nine films.
18. The multi-laminate film of claim 15, wherein the machine
direction angle of the at least two spiral cut oriented films are
the same.
19. The multi-laminate film of claim 15, wherein the machine
direction angle of the at least two spiral cut oriented films are
different.
20. The multi-laminate film of claim 13, wherein each film of the
plurality of films comprises high density polyethylene (HDPE)
and/or linear low density polyethylene (LLDPE).
Description
CROSS-REFERNCE TO RELATED APPLICATION
[0001] The present application claims priority to U.S. Provisional
Application No. 63/032,005, filed May 29, 2020, the entirety of
which is hereby incorporated by reference.
FIELD
[0002] The present disclosure generally relates to laminated films
and, in particular, laminated films comprised of spiral cut and
biaxially oriented films.
BACKGROUND
[0003] Plastic films are commonplace today and are used to create
plastic bags, adhesive tapes, etc. Such plastic films include
spiral-cut oriented (SC) films and biaxially oriented (BO)
films.
SUMMARY
[0004] In one aspect, a multi-laminate film comprises a first
biaxially oriented film having a first machine direction angle. A
first spiral cut oriented film has a second machine direction angle
different than the first machine direction angle. The
multi-laminate film also comprises at least one of a second
biaxially oriented film having the first machine direction angle or
a second spiral cut oriented film. The first biaxially oriented
film, the first spiral cut oriented film and the at least one of
the second biaxially oriented film or second spiral cut oriented
film are laminated together.
[0005] In another aspect, a multi-laminate film comprises a
plurality of films laminated together. Each film has a machine
direction angle. The machine direction angles of at least two films
of the plurality of films are different from each other.
[0006] Other objects and features of the present disclosure will be
in part apparent and in part pointed out herein.
BRIEF DESCRIPTION OF THE FIGURES
[0007] FIG. 1 is a schematic illustration of one embodiment of a
film of the present disclosure;
[0008] FIG. 2 is a schematic exploded illustration of one
embodiment of a multi-laminate film according to one embodiment of
the present disclosure;
[0009] FIG. 3 is a schematic illustration of the multi-laminate
film of FIG. 2;
[0010] FIG. 4 is a schematic illustration of a multi-laminate film
according to another embodiment of the present disclosure; and
[0011] FIG. 5 is a Heat Seal Strength Curve comparing a
multi-laminate film according to one embodiment of the present
disclosure to a commercially available prior art film.
[0012] Corresponding reference characters indicate corresponding
parts throughout the drawings.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0013] The films disclosed according to this disclosure are
multi-laminate films made from multiple films (e.g., plies)
laminated or joined together. Each ply of film is preferably one of
either a spiral-cut oriented film (SC film) or a biaxially oriented
film (BO film). BO film refers to film that is oriented in two
directions, the machine direction (e.g., generally parallel to the
longitudinal axis LA of the film) and the cross machine direction.
That is, after extrusion, the film is stretched in both the machine
direction and the cross machine direction. As a reference point, BO
film has a machine direction angle of about 0.degree. (e.g., the
machine direction angle is parallel to the machine direction or
longitudinal axis LA of the film). SC film refers to film that is
oriented in a direction other than the machine direction or cross
machine direction (e.g., at an angle to the longitudinal axis LA of
the film). That is, after extrusion, the direction the film was
stretched in or has been oriented at an angle to the longitudinal
axis LA of the film. Relative to BO films, the SC films have
machine direction angles other than 0.degree. such as +45.degree.
(relative to 0.degree.) or -45.degree. (relative to 0.degree.).
Preferably, the SC films have a machine direction angle between the
inclusive range of about 30.degree. to about 60.degree. (e.g., a
range of about 30.degree. to 60.degree. relative to 0.degree. or
about -30.degree. to -60.degree. relative to 0.degree.). It is
understood the SC films disclosed herein can have any machine
direction angle between the inclusive range of about 30.degree. to
about 60.degree.. The use of films of other orientations and
orientations types are within the scope of the present
disclosure.
[0014] Referring to FIG. 1, a schematic illustration of an
individual film 10 is shown that can be combined with other such
individual films to form the multi-laminate films of the present
disclosure (e.g., multi-laminate films 100, 200). The film 10 shown
in FIG. 1 can be either a SC film or a BO film. The film 10
includes multiple layers A, B, C. Preferably, each layer A, B, C is
made of either high density polyethylene (HDPE) or linear low
density polyethylene (LLDPE), although other suitable materials are
within the scope of the present disclosure. In the illustrated
embodiment, the film 10 includes three layers A, B, C (broadly, at
least three layers), although more layers are within the scope of
the present disclosure. The film 10 includes two outer skin layers
A, C with a core layer B disposed there-between. The two outer skin
layers A, C are preferably about 2 pm thick. Accordingly, the bulk
of the thickness of the film 10 comes from the core layer B which
also generally determines the mechanical (e.g., strength)
properties of the film. In an embodiment, a BO film may have a core
layer B having a thickness of about 1 mil, although other
thicknesses are within the scope of the present disclosure. In
addition, the thickness of the core layer B (and the overall
thickness of the individual film 10) can vary depending on the
desired overall thickness of the multi-laminate film of which the
individual film is a part. In one embodiment where the film 10 is
an SC film, the two outer skin layers A, C are LLDPE and the core
layer B is HDPE. In one embodiment of where the film 10 is a BO
film, the skin layers A, C are preferably an LLDPE with antiblock,
such as a silica based antiblock (e.g., Dow C8 Metallocene with
4,000 ppm silica antiblock), to prevent the film sticking with
itself (when it is wound up) or with other films. In one
embodiment, one or both of the skin layers A, C may undergo a
corona treatment as desired in order to improve the ink adhesion of
the surface of the film 10. It is understood that all the layers of
the film 10 (e.g., skin layers A, C and core layer B) are oriented
in same direction. In one embodiment, the film 10 is an SC film
that includes skin layers A, C of LLDPE with antiblock and a core
layer B of HDPE. In one embodiment, the film 10 is a BO film that
includes skin layers A, C of LLDPE with antiblock and a core layer
B of LLDPE. In another embodiment, the core layer B of the BO film
10 may be HDPE. The layers A, B, C and the BO and SC films 10 can
be any combinations of LLDPE and HDPE. The BO and SC films 10 may
be prepared by a suitable process, such as a conventional
continuous extrusion processes. As used herein, an individual film
10 that is a BO film is designated by reference numeral "10A" and
an individual film 10 that is a SC film is designated by reference
numeral "10B." Reference numeral "10" is used to designate an
individual film generally (e.g., any type of individual film).
[0015] Referring to FIGS. 2-4, multi-laminate films 100 of the
present disclose are formed by layering different BO films 10A and
SC films 10B together. The BO films 10A and SC films 10B are
laminated together in a suitable manner such as by using heat
lamination, as is generally known in the art. Generally speaking,
the multi-laminate film 100 is formed by laminating BO and SC films
10A, 10B together such that no two adjacent individual films 10
have the same machine direction angle. The multi-laminate film 100
can include any number of individual films 10 laminated together.
For example, the multi-laminate film can include between the
inclusive range of three to nine films 10 layered together. Each
multi-laminate film will include one (e.g., a first) BO film 10A,
one (e.g., a first) SC film 10B and at least one of another (e.g.,
second, third, fourth, fifth, etc.) BO film(s) and/or another
(e.g., second, third, fourth, fifth, etc.) SC film(s). For example,
in the embodiment illustrated in FIGS. 2 and 3, the multi-laminate
film 100 includes two BO films 10A and one SC film 10B laminated
together. As mentioned above, the BO films 10A have a machine
direction angle (e.g., a first machine direction angle) of
generally 0.degree. (e.g., parallel to the longitudinal axis LA).
In this embodiment, the SC film 10B has a machine direction angle
.alpha. (e.g., a second machine direction angle) of any number
within the inclusive range of about +30.degree. to about
+60.degree., such as about +57.6.degree., about +45.degree., about
+45.8.degree., about +38.9.degree., or about +33.2.degree.,
although other angles are within the scope of the present
disclosure. For example, the SC film 10A may have a negative
machine direction angle, such as about -45.degree., in one
embodiment. In the illustrated embodiment, the +45.degree. SC film
10B is disposed (e.g., sandwiched or laminated) between the two BC
films 10A. As used herein, a positive angle refers to an angle
taken on one (e.g., left) side of (e.g., in a counterclockwise
direction from) the longitudinal axis LA (e.g., 0.degree.) and a
negative angle refers to an angle taken on the other (e.g., right)
side of (e.g., in a clockwise direction from) the longitudinal
axis. The SC films 10B of the present disclosure can have a
positive or negative machine orientation angle in any layer or ply
of the multi-laminate film. In the illustrated embodiments, the
machine directions of the BO and SC films 10A, 10B are
schematically represented by thin, solid black lines.
[0016] Referring to FIG. 4, another embodiment of a multi-laminate
film is generally indicated by reference numeral 200. In the
embodiment, the multi-laminate film 200 includes two SC films 10B
and a BO film 10A laminated together. The BO film 10A has a machine
direction angle of 0.degree., the upper SC film 10B has a machine
direction angle of any number within the inclusive range of about
+30.degree. to about +60.degree., as mentioned above, and the lower
SC film 10B has a machine direction angle of any number within the
inclusive range of about -30.degree. to about -60.degree.. For
example, the upper SC film 10B can have a machine direction angle
of about +45.degree. and the lower SC film 10B can have a machine
direction angle of about -45.degree.. In other embodiments, the two
SC films 10B may both have the same machine direction angle (e.g.,
either +45.degree. or -45.degree.). The BO film 10A is disposed
between the two SC films.
[0017] In one embodiment, the multi-laminate film may include more
than three layers, and alternate between layers of SC films 10B and
BO films 10A. In another embodiment, the multi-laminate films may
alternate between layers of SC films 10B having different machine
angles. For example, two SC films 10B can be adjacent to one
another as long as they have different machine angles and,
preferably, machine angles that are the opposite (e.g., positive
and negative) of one another, such as +45.degree. and
-45.degree..
[0018] Using the principles outlined herein, it is possible to come
up with any number of different permutations of SC and BO films
10B, 10A to form a multi-laminate film. Some of these different
permutations are listed below in Table 1 (all BO films 10A have a
machine orientation angle of 0.degree.). The order of the
individual films 10 in the multi-laminate film is given from left
to right (e.g., upper most film to lower most film).
TABLE-US-00001 TABLE 1 Exemplary Multi-Laminate Film Permutations
Number of Film Layers Arrangement and Orientation of BO and SC
Films 3 BO/+45.degree. S C./BO (as shown in FIGS. 2 and 3) 3
+45.degree. S C./BO/-45.degree. S C. (as shown in FIG. 4) 4
+30.degree. S C./BO/-30.degree. S C./BO 4 BO/-60.degree. S
C./+60.degree. S C./BO 5 BO/+35.degree. S C./BO/-35.degree. S C./BO
5 +50.degree. S C./-50.degree. S C./BO/-40.degree. S C./+40.degree.
S C. 6 BO/+45.degree. S C./-45.degree. S C./BO/+45.degree. S
C./-45.degree. S C. 6 +30.degree. S C./BO/-30.degree. S
C./+60.degree. S C./BO/-60.degree. S C. 7 BO/+45.degree. S
C./BO/-45.degree. S C./BO/+45.degree. S C./BO 7 +55.degree. S
C./BO/-55.degree. S C./BO/+35.degree. S C./BO/-35.degree. S C. 8
BO/-50.degree. S C./+35.degree. S C./-45.degree. S C./+45.degree. S
C./-35.degree. S C./+50.degree. S C./BO 8 BO/+60.degree. S
C./BO/-30.degree. S C./+30.degree. S C./BO/-60.degree. S C./BO 9
BO/+45.degree. S C./BO/-45.degree. S C./BO/+45.degree. S
C./BO/-45.degree. S C./BO 9 -30.degree. S C./+30.degree. S
C./BO/+45.degree. S C./BO/-45.degree. S C./BO/+60.degree. S
C./-60.degree. S C.
[0019] These different permutations of multi-laminate films are
exemplary only, and other permutations are within the scope of the
present disclosure. Accordingly, the multi-laminate films of the
present disclosure generally (and broadly) includes a plurality of
films 10 laminated together (e.g., one on top of another and so
on). Each film 10 has a machine direction angle .alpha.. The
machine direction angles .alpha. of at least two films 10 of the
plurality of films are different from each other in the
multi-laminate films of the present disclosure. Preferably, the
films 10 are arranged such that no two adjacent films of the
plurality of films have the same machine direction angle .alpha.
(e.g., one film has a machine direction angle that is different
than the machine direction angle of a film immediately above said
one film and that is different than the machine direction angle of
a film immediately above said one film). Desirably, each film 10 of
the plurality of films is either a biaxially oriented film 10A or a
spiral cut oriented film 10B. The multi-laminate film can include
one or more (e.g., at least two) biaxially oriented films 10A. For
example, the multi-laminate film can include one, two, three, four,
five, etc. biaxially oriented films 10A. Likewise, the
multi-laminate film can include one or more (e.g., at least two)
spiral cut oriented films 10B. For example, the multi-laminate film
can include one, two, three, four, five, six, seven, eight, etc.
spiral cut oriented films 10B. Where the multi-laminate film
includes multiple spiral cut oriented films 10B, the machine
directions angles .alpha. for the spiral cut oriented films can all
be the same, can all be different, or some of the machine
directions angles can be the same. In one embodiment, the films 10
in the multi-laminate film are arranged to alternate between
biaxially and spiral cut oriented films 10A, 10B (e.g., biaxially
oriented film, spiral cut oriented film, biaxially oriented film,
spiral cut oriented film and so on (depending on the total number
of films)).
[0020] The multi-laminate film can be of generally any thickness.
For example, a three film multi-laminate film 100 as shown in FIGS.
2-4 can have a thickness of 3 mils, 3.5 mils or 4 mils. The
thickness of the multi-laminate film depends on the thickness of
the SC and BO films 10B, 10A comprising the multi-laminate films.
The SC and BO films 10B, 10A may have generally the same or
different thicknesses. The relative thicknesses of the SC film(s)
10B and BO film(s) 10A in the multi-laminate film can be varied as
desired in order to vary the mechanical properties of the film to
be closer to those of individual SC films 10B or those of
individual BO films 10A.
[0021] Multi-laminate films of the present disclosure possess
superior mechanical (e.g., strength) properties over conventional
multi-laminate films. It is believed the layering of films 10 with
different machine angles strengthens the multi-laminate film. Also,
the multi-laminate films of the present disclosure experience
little to no twist curling. The presence of multiple layered films
10 of different machine angles is believed to resist or counteract
the internal forces within the multi-laminate film that can cause
twist curling.
EXAMPLE 1
[0022] In one example, a multi-laminate film of the present
disclosure was prepared and tested for mechanical properties in
comparison to a corresponding commercially available prior art
film. The multi-laminate film of the present disclosure tested was
similar to the multi-laminate film 100 shown in FIGS. 2 and 3. The
tested multi-laminate film comprised two outer layers of BO film
with a SC film having a machine direction angle of +57.6.degree.
therebetween. The prior art film was a commercial available spiral
cut cross laminated film (e.g., the prior art film does not include
a BO film layer). As shown in FIG. 5, which is a Heat Seal Strength
Curve (Theller Sealer) comparing the two films, the tested
multi-laminate film (designated as "ML Film"), constructed
according to the teachings of the present disclosure, has a higher
seal strength and a larger seal window then the prior art film
(designated as "PA Film"). Thus, the tested multi-laminate film,
constructed according to the teachings of the present disclosure,
provides a stronger seal and larger seal window then comparable
prior art films. The table boxes with light gray shading are
numbers in the chart that indicate the seal window for a specified
target strength.
EXAMPLES 2-4
[0023] In additional examples, three multi-laminate films
constructed according to the teachings of the present disclosure of
different thicknesses were prepared and tested for mechanical
properties in comparison to corresponding commercially available
prior art films of comparable thicknesses. The multi-laminate films
of the present disclosure tested were the same as shown in FIGS. 2
and 3. Each multi-laminate film 100 comprised two outer layers of
BO Film with a SC film layer therebetween having a machine
direction angle as indicated below. The prior art films were
commercial available spiral cut cross laminated films of similar
thicknesses to the multi-laminate film. Each multi-laminate film
was compared against spiral cut cross laminated films having two SC
film layers (e.g., two plies) and four SC film layers (e.g., four
plies).
[0024] For the following tables, the column heading "3 plies
(2BE+SC)" is a multi-laminate film according to the present
disclosure (this column has a light gray background), the column
heading "2 plies" is a prior art film having two SC film layers and
the column heading "4 plies" is a prior art film having four SC
film layers. "BE" stands for a BO film 10A.
[0025] Table 2, below, shows the test results for a multi-laminate
film with a thickness of 3 mils in comparison with corresponding
prior art films of similar thicknesses. In this example, the SC
film had a machine direction angle of +57.6.degree..
TABLE-US-00002 TABLE 2 3 plies 2 plies (2BE + SC) 4 plies THICKNESS
(mils) Internal 3.2 3.0 3.0 THICKNESS (GSM) ASTM-5261 74.4 70.4
70.8 TENSILE @ ULT ASTM MD 16.9 21.8 18.2 (lbs/in) D882 TD 15.9
37.9 15.6 TENSILE @ ULT ASTM MD 6,253 7,295 6,114 (PSI) D882 TD
5,582 12,683 5,238 ELONGATION @ULT ASTM MD 685 341 690 (%) D882 TD
675 108 800 DART IMPACT (grams) ASTM METHOD 641 1,415 431 D1709 A
DELAMINATION ASTM 2.6 0.2 1.7 (lbs/in) D882 1.36 ELMENDORF TEAR
ASTM MD 3,656 90 527 (grams) D1922 TD 4,006 80 1,384 PUNCTURE-PROP
TEAR ASTM MD 7,866 2,647 5,585 (grams) Sled: 1 lb D2582 TD 8,110
<1717 6,640 twist curl no twist curl no twist curl indicates
data missing or illegible when filed
[0026] Table 3, below, shows the test results for a multi-laminate
film with a thickness of 3.5 mils in comparison with corresponding
prior art films of similar thicknesses. In this example, the SC
film had a machine direction angle of +57.6.degree..
TABLE-US-00003 TABLE 3 3 plies 2 plies (2BE + SC) 4 plies THICKNESS
(mils) Internal 3.6 3.5 3.4 THICKNESS (GSM) ASTM-5261 84.5 84.8
81.1 TENSILE @ ULT ASTM MD 21.4 24.5 21.8 (lbs/in) D882 TD 20.5
37.8 16.4 TENSILE @ ULT ASTM MD 5,975 7,037 6,394 (PSI) D882 TD
5,735 10,857 4,795 ELONGATION @ULT ASTM MD 851 116 697 (%) D882 TD
699 265 835 DART IMPACT (grams) ASTM METHOD 564 1,691 544 D1709 A
DELAMINATION ASTM 2.4 0.7 3.0 (lbs/in) D882 1.5 ELMENDORF TEAR ASTM
MD 4,523 116 578 (grams) D1922 TD 5,198 265 1,382 PUNCTURE-PROP
TEAR ASTM MD 8,320 2,773 6,750 (grams) Sled: 1 lb D2582 TD 8,130
<1717 8,861 twist curl no twist curl no twist curl indicates
data missing or illegible when filed
[0027] Table 4, below, shows the test results for a multi-laminate
film with a thickness of 4 mils in comparison with corresponding
prior art films of similar thicknesses. In this example, the SC
film had a machine direction angle of 45.8.degree..
TABLE-US-00004 TABLE 4 3 plies 2 plies (2BE + SC) 4 plies THICKNESS
(mils) Internal 4.2 4.0 4.1 THICKNESS (GSM) ASTM-5261 94.5 9.8 92.8
TENSILE @ ULT ASTM MD 22.8 26.3 28.4 (lbs/in) D882 TD 21.9 35.1
20.8 TENSILE @ ULT ASTM MD 5,485 6,614 6,917 (PSI) D882 TD 5,267
8,821 5,069 ELONGATION @ULT ASTM MD 709 260 551 (%) D882 TD 672 107
751 DART IMPACT (grams) ASTM METHOD 570 1,621 825 D1709 A
DELAMINATION ASTM 5.0 0.46 6.6 (lbs/in) D882 0.62 ELMENDORF TEAR
ASTM MD 3,244 220 1,411 (grams) D1922 TD 3,963 370 4,122
PUNCTURE-PROP TEAR ASTM MD 9,174 2,273 8,149 (grams) Sled: 1 lb
D2582 TD 9,484 5,565 10,524 twist curl no twist curl no twist curl
indicates data missing or illegible when filed
[0028] The results show that the multi-laminate films of the
present disclosure have superior mechanical properties over the
commercially available prior art films of similar thicknesses. As
can be seen, the multi-laminate films of the present disclosure
possessed greater tensile strengths than the prior art films and
have less elongation. The multi-laminate films of the present
disclosure also can withstand a greater impact than the prior art
films. The multi-laminate films of the present disclosure also do
not twist cure, unlike the prior art films having only two layers
of SC film. The tests for the different mechanical properties were
conducted under the appropriate ASTM standard as indicated in the
tables above.
EXAMPLES 5-8
[0029] In additional examples, four multi-laminate films of the
present disclosure of different thicknesses and different film
arrangements were prepared and tested for mechanical properties.
Film 1 (Item Number RXVT202-1) comprised two layers of BO film 10A
with a SC film 10B therebetween (e.g., a multi-laminate film 100 as
show in FIGS. 2 and 3) having a machine direction angle of
+33.2.degree. and an overall thickness of 2.7 mils. Film 2 (Item
Number RXVT101-2) comprised two layers of BO film 10A with a SC
film 10B therebetween (e.g., a multi-laminate film 100 as show in
FIGS. 2 and 3) having a machine direction angle of +57.6.degree.
and an overall thickness of 3.7 mils. Film 3 (Item Number
RXVT204-1) comprised two layers of SC film 10B, each having the
same machine orientation angle of -38.9.degree., with a BO film 10A
therebetween and an overall thickness of 2.8 mils. Film 4 (Item
Number RXVT206-1) comprised two layers of SC film 10A, each having
the same machine orientation angle of -38.9.degree., with a BO film
10A therebetween and an overall thickness of 3.7 mils. Table 5
below shows the test results for these different multi-laminate
films of the present disclosure.
TABLE-US-00005 TABLE 5 BE + SC + BE BE + SC + BE SC + BE + SC SC +
BE + SC Order-item # RXVT202-1 RXVT101-2 RXVT204-1 RXVT206-1 Roll
ID: RECIPE THICKNESS (mils) Internal 2.7 3.7 2.8 3.7 THICKNESS
(.mu.) ASTM 69.11 94.39 70.35 95.1 Thickness STD dev D5199 2.64
2.17 2.68 4.0 Thickness STD dev (%) D5199 3.8% 2.3% 3.8% 4.2%
THICKNESS (GSM) ASTM-5261 65.7 93.7 65.1 88.7 TENSILE ASTM MD 21.4
24.8 18.2 23.6 @ ULT (lbs/in) D862 TD 37.8 40.3 26.1 23.4 TENSILE
ASTM MD 7,847 6,660 6,571 6,303 @ ULT (PSI) D862 TD 13,893 10,831
9,423 6,250 ELONGATION ASTM MD 250 250 322 350 @ ULT (%) D862 TD 82
100 93 157 DART IMPACT ASTM METHOD 1,384 1,691 1,064 876 (grams)
D1709 A DELAMINATION ASTM 0.24 0.40 0.31 0.26 (lbs/in) D862 0.30
0.30 0.92 0.32 ELMDORF TEAR ASTM MD 78 199 107 862 (grams) D1922 TD
55 326 140 157 PUNCTURE-PROP. ASTM MD <1717 <1717 <1717
3,224 TEAR (grams) Sled: 1 lb D2562 TD <1717 <1717 3624 5,347
TONGUE TEAR ASTM MD 2.5 3.1 2.63 5.59 (lbs) D1936 TD 2.1 4.2 3.06
7.56 GRAVES TEAR ASTM MD 4.1 5.2 5.17 6.81 (lbs) D1004 TD 4.2 6.1
4.12 6.94 Water Bath (%) @ ASTM MD -2.0 -3.5 -3.6 -5.4 180.degree.
F. (82.degree. C.) .times. 1 min D1204 TD 2.6 2.0 2.6 4.6 indicates
data missing or illegible when filed
[0030] The physical properties of films 1-4 can be compared to the
commercially available prior art films described in Tables 2-4. As
can be seen, the results again show that the multi-laminate films
of the present disclosure have superior mechanical properties over
the commercially available prior art films of similar thicknesses
(e.g., comparing the 2.7 mil thick Film 1 to the 3 mil thick prior
art films of Table 2). As can be seen, the multi-laminate films of
the present disclosure possessed greater tensile strengths than the
prior art films and have less elongation. The multi-laminate films
of the present disclosure also can withstand a greater impact than
the prior art films. The tests for the different mechanical
properties of films were conducted under the appropriate ASTM
standard as indicated in the table above.
[0031] As used herein, terms of degree such as "about" and
"generally" mean plus or minus 10%. For example, about 30 degrees
means 30 degrees plus or minus 3 degrees (e.g., 27-33 degrees).
[0032] When introducing elements of the present disclosure or the
preferred embodiments(s) thereof, the articles "a", "an", "the" and
"said" are intended to mean that there are one or more of the
elements. The terms "comprising", "including" and "having" are
intended to be inclusive and mean that there may be additional
elements other than the listed elements.
[0033] In view of the above, it will be seen that the several
objects of the disclosure are achieved and other advantageous
results attained.
[0034] As various changes could be made in the above products and
methods without departing from the scope of the disclosure, it is
intended that all matter contained in the above description shall
be interpreted as illustrative and not in a limiting sense.
* * * * *