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Патент USA US3029159

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April 10, 1962
R. F. DE LONG
3,029,149
MEAT PACKAGE
Filed April ‘7. 1960
2 Sheets-Sheet 1
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April 10, 1962
R. F. DE LONG
3,029,149
MEAT PACKAGE
Filed April 7. 1960
2 Sheets-Sheet 2
3,029,149
3
over along hinge line 13 to lie in covering relation to the
cover panel ‘12 and the meat product 22 and the package
may then be sealed by the application of heat and pres
sure to the entire marginal areas, sealing being obtained
through the medium of the thermoplastic ?lm liner.
Tobe satisfactory for use in the present invention, the
sheet material forming the ?lm liner of the package must
exhibit certain speci?ed characteristics. The ?lm must be
to atmospheric oxygen, and creates a very unfavorable
opinion in the mind of the customer as to the quality of
the meat product. By contrast, if the ?lm liner is left un
adhered to the base panel in the central, meat supporting
area, the meat in contact with this area will retain the
same desirable and attractive rich red color as that shown
by the portions of the meat which are covered only by the
?lm liner and exposed to customer inspection through
the window areas of the package.
thermoplastic so that it will seal to itself under the in
Meat displayed for sale in the package of the present
?uence of heat and pressure and must be uniformly ex 10
invention has been found to have substantially increased
tensible to the degree necessary to form a pocket area for
shelf-life over comparable meat displayed in conventional
the product to be packaged without rupture of the ?lm
packages, retaining its freshness, ?avor and attractive red
material. To be considered uniformly extensible, a ?lm
color for as much as 75 to 100% longer than conven
should stretch evenly over essentially the entire area to
which stress is applied without appreciable formation of 15 tionally packaged meat, thus resulting in substantial econ
omies in the marketing of fresh, raw red meat. In addi
local thin spots which cause localized rupture. The uni
tion to the excellent product protection which it aifords,
form stretching of the ?lm to form the pocket area is
the package provides superior product display and han
shown in FIGURE 4 and in FIGURE 5, the resulting
dling characteristics.
decrease in thickness of the ?lm in the pocket area being
somewhat exaggerated in the drawings for the sake of 20 Various modi?cations may be made in the package con
struction without departing from the spirit of my inven
clarity. In general, a uniform two-dimensional extensi
tion and such modi?cations are intended to be included
bility of 100% or more without rupture has proven satis
within the scope of the appended claims.
factory for my use. That is, a ?lm which may be uni
I claim:
formly stretched to at least double its original length or
1. A food package comprising raw red meat sealed in
width without rupturing will be satisfactory. In addition,
a display container comprising a supporting base for said
the permeability of the ?lm to oxygen gas must be rela
tively high while its permeability to water vapor must be
meat, said base being made of ?exible paperboard having
relatively low. Permeability of a one mil ?lm to water
vapor should not exceed about 200 grams per square
per 24 hours, a closure panel hinged to said base, said
meter per 24 hours in standard permeability testing equip
closure panel having the same contour and dimensions as
ment, while the permeability to air or oxygen gas should
be as least 1000 cubic centimeters per square meter per
24 hours as measured by standard permeability testing
equipment, the optimum permeability to air and oxygen
a permeability to air of at least 50 liters per square meter
said supporting base, said closure panel being provided
with a cut-out window, said base and closure panel in
cluding the window being completely lined with a trans
parent ?exible heat-scalable ?lm having a permeability
ranging from about 1000 cc. to 5000 cc. per square meter 35 to water vapor of less than 200 grams per square meter per
per twenty four hours. Transparency of the ?lm is, of
24 hours and a permeability to air of at least 1000 cubic
course, highly desirable, although a moderate- degree of
translucency may be tolerated if other characteristics are
centimeters per square meter per 24 hours and uniformly
extensible under stress to at least double its original di
satisfactory.
mensions, said transparent ?lm being adhesively secured
Films which have proven particularly satisfactory as 40 to all the margins of said base and all the margins of said
closure panel, said closure panel being folded over and
components of the package of my invention are 80 to 120
covering said base and the meat supported thereon, all
gauge (0.8 to 1.2 mils in thickness) rubber hydrochloride
the superposed margins of said closure panel being heat
film and similar gauge ?lm made of polyvinyl chloride.
sealed to the contacting margins of said base, the meat
These ?lms have permeabilities to air or oxygen of from
1000 to 3000 cc. per square meter per 24 hours and a 45 supporting area of said transparent ?lm being adhered to
said base and being larger in area than the contacting
permeability to water vapor of from 100 to 200 grams
surface of the meat supported thereon, the red color of said
per square meter per 24 hours.
meat on all surfaces including the supporting surface
The paperboard sheet material from which the base
being stabilized for a substantial period of time by the
panel of the package is constucted should have a perme
ability to oxygen very substantially in excess of that of the 50 effective passage of air through the walls of the package.
2. A food package comprising raw, red meat sealed in
?lm liner so that oxygen will pass relatively freely through
a display container comprising a supporting base for said
the base panel. Ordinary uncoated paperboard has a per
meat, said base being made of flexible paperboard hav
meability to air and oxygen ranging from about 50' up to
ing a permeability to air of at least 50 liters per square
more than 1000 times that of the ?lms previously dis
cussed and is quite satisfactory for the purpose. In gen 55 meter per 24 hours, a closure panel hinged to said base,
said closure panel‘ having the same contour and dimen
eral, such paperboard will have a permeability to air rang
sions as said supporting base, said closure panel being
ing upward from 50 liters per square meter per 24 hours
provided with a cut-out window, said base and closure
under standard test conditions. It must be emphasized,
however, that the pores normally present in paperboard
panel including the window being completely lined with
must not be closed by a coating or adhesive applied in 60 a rubber hydrochloride ?lm having a permeability to water
vapor of less than 200 grams per square meter per 24
those areas upon which the portion of the liner contacting
hours and a permeability to air of at least 1000 cubic
the meat product are superimposed, for if this be the case,
centimeters per square meter per 24 hours, said rubber
insul?cient oxygen will pass through the package walls
hydrochloride ?lm being adhesively secured to all the
to maintain the desired red color of the enclosed meat
product. 'For this reason, the ‘?lm liner is not adhered 65 margins of said base and all the margins of said closure
panel, said closure panel being folded over and covering
to the paperboard base in the meat-supporting area, but
said base and the meat supported thereon, all the super
only in the marginal areas lying outside of the area cov
ered by the meat product.
It hae been found that if the liner is laminated to the
posed margins of said clousre panel being heat-sealed to
the contacting margins of said base, the meat-supporting
base panel by an adhesive applied in the area to be cov 70 area of said rubber hydrochloride ?lm being unadhered
to said base and being larger in area than the contacting
ered by the meat product, the meat enclosed in the com
pleted package will, in the course of a few hours, attain
surface of the meat supported thereon, the red color of
said meat on all surfaces including the supporting surface
abrown color in the areas in contact with the laminated
being stabilized for a substantial period of time by the
sheet. This brown color will not revert to the charac
teristic red color of fresh meat‘ on exposure of the meat 75 effective passage of air- through the walls of the package.
5
3,029,149
3. A food package comprising raw, red meat sealed in
a display container comprising a supporting base for said
meat, said base being made of ?exible paperboard having
a permeability to air of at least 50 liters per square meter
6
meat supported thereon, all the superposed margins of
said closure panel being heat»sealed to the contacting mar
gins of said base, the meat-supporting area of said poly
vinyl chloride ?lm being unadhered to said base and
per 24 hours, a closure panel hinged to said base, said 5 being larger in area than the contacting surface of the
closure panel having the same contour and dimensions as
meat supported thereon, the red color of said meat on all
said supporting base, said closure panel being provided
with a cut-out window, said base and closure panel in . surfaces including the supporting surface being stabilized
for a substantial period of time by the effective passage
cluding the window being completely lined with a poly
vinyl chloride ?lm having a permeability to water vapor 10 of air through the walls of the package.
of less than 200 grams per square meter per 24 hours and
a permeability to air of at least 1000 cubic centimeters
per square meter per 24 hours, said polyvinyl chloride
References Cited in the ?le of this patent
UNITED STATES PATENTS
?lm being adhesively secured to all the margins of said
2,736,656
base and all the margins of said closure panel, said closure 15 2,900,259
panel being folded over and covering said base and the
2,963,215
Marshall ____________ __ Feb. 28, 1956
Snyder et a1. ________ __ Aug. 18, 1959
Saidel et al ____________ __ Dec. 6, 1960
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,029,149
April l0I 1962
Robert F. De Long
It is hereby certified t
hat error appears in the above numbered pat
e said Letters Patent should read as
ent requiring correction and that th
corrected below.
Column 4, line 45, for "adhered" read ~— unadhered —-°
Signed and sealed this 18th day of August 1964.
(SEAL)
Altest:
EDWARD J . BRENNER
ERNEST Officer
W. SWIDER
Attesting
Commissioner of Patents
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