U.S. patent number 3,785,544 [Application Number 05/253,004] was granted by the patent office on 1974-01-15 for tray with strengthening member.
This patent grant is currently assigned to Phillips Petroleum Company. Invention is credited to Ernest L. Smith.
United States Patent |
3,785,544 |
Smith |
January 15, 1974 |
TRAY WITH STRENGTHENING MEMBER
Abstract
An article of manufacture comprising in combination, a
rectangularly shaped tray having sloping sidewalls terminating in a
flanged rim, a film closure sealed to the top of the tray rim, and
a U-shaped strengthening member having a first flange portion
sealed to a lower rim surface on one side of the tray, extending
downwardly across the bottom of the tray and upwardly to the lower
surface of the rim on a second side of the tray wherein a second
flange portion of the U-shaped sheet is sealed thereto.
Inventors: |
Smith; Ernest L. (Kansas City,
MO) |
Assignee: |
Phillips Petroleum Company
(Bartlesville, OK)
|
Family
ID: |
22958444 |
Appl.
No.: |
05/253,004 |
Filed: |
May 15, 1972 |
Current U.S.
Class: |
206/446; 40/312;
229/125.35; 229/406; 40/324 |
Current CPC
Class: |
B65D
77/2024 (20130101); B65D 25/34 (20130101); B65D
77/046 (20130101) |
Current International
Class: |
B65D
77/10 (20060101); B65D 77/04 (20060101); B65D
77/20 (20060101); B65D 25/34 (20060101); B65D
25/00 (20060101); B65d 005/62 () |
Field of
Search: |
;229/14R,14B,14BE,43,2.5,40
;206/46F,DIG.29,65C,45.32,45.34,45.31,78B ;99/171TC,171H
;40/307,308,312,313,324 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Dixson, Jr.; William T.
Assistant Examiner: Marcus; Stephen
Attorney, Agent or Firm: Quigg & Oberlin
Claims
What I claim is:
1. An article of manufacture comprising in combination, a tray
having a bottom wall with sloping sidewalls extending upwardly from
the peripheral of the tray bottom wall terminated in a flat,
flanged rim having upper and lower surfaces; a cover closure film
sealed to the upper surface of the rim; and a U-shaped
strengthening member of sheet material having a first flanged
portion sealed to the lower surface of the rim on a first side of
the tray and extended downwardly from said sealed first flanged
portion across the bottom wall and upwardly to the lower surface of
the rim on a second side of the tray, said strengthening member
terminating in a second flanged portion sealed to the lower surface
of the rim on the second side of the tray.
2. An article of manufacture according to claim 1 wherein the tray
is thermoformed having irregularly shaped sidewalls which slope
outwardly from the bottom wall peripheral to the flanged rim.
3. An article of manufacture according to claim 1 wherein the
U-shaped strengthening member is comprised of paperboard which is
extended downwardly at right angles from the first and second
flanged portions.
4. An article of manufacture according to claim 1 wherein the
U-shaped paperboard flange portions are heat melt adhesive
coated.
5. An article of manufacture according to claim 1 wherein the tray
is a thermoformed tray having irregularly shaped sidewalls with
strengthening members therein, the U-shaped strengthening member is
comprised of paperboard which is extended downwardly at right
angles from the first and second flange portions, said flange
portions having a coating of hot melt adhesive thereon, and the
U-shaped strengthening member completely covers two sides and the
bottom wall of the tray.
Description
This invention relates to an article of manufacture comprising, in
combination, a tray and a strengthening member. In another aspect,
this invention relates to a tray having a strengthening member
along two sidewalls and the bottom thereof which can be decorated
or labeled. In yet another aspect, this invention relates to a tray
having a strengthening member wherein two sides and the top of the
tray remain uncovered by the strengthening member, thus allowing
content inspection. In still another aspect, this invention relates
to a tray and a strengthening member which can be displayed on end
or side.
In the container field there is an ever increasing use of
containers which have a relatively rigid base made from an easily
formable material such as plastic. Many of these containers have
irregularly shaped sidewalls to provide ribs for strength or to
provide a desired esthetic design for the tray. A cover is provided
which is formed from a relatively rigid plastic material and
interlocks with the top edge of the container base or a film of
heat sealable material is sealed to the top edge of the container.
Due to the techniques of modern sales engineering, it is often
desired that these containers be highly illustrated. Also, there is
a need for side labels on these containers so that the contents of
the containers and/or brand indicia may be readily ascertained when
the containers are placed in a vertical stack or placed on a high
shelf. There has been a problem of printing on the sides of these
containers having irregular side surfaces due to reinforcing ribs
located in the sides of the container base. The irregular sides
formed by these reinforcing ribs provide only a limited area on
which side labels can be attached, therefore increasing the
possibility that the side label may fall off of the container
during handling.
Container trays having strengthening members known to the art
provide adequate decoration areas and strength for stacking and
shipping, but leave little or no exposure of the tray for content
inspection. Modern sales engineering requires a tray container
having adequate strength while at the same time providing adequate
display of, for example, ends, sides, or tops of the trays. Many
packaged goods such as food products, and the like, are presently
sold in containers which are heremetically sealed to provide
optimum protection, thus the need for strengthening members.
Furthermore, these food products require as much display area as
possible, thus the need for a strengthened tray container having
decoration surface as well as display surface.
I have found that these problems can be overcome by attaching
decorative side labels to the strengthening member which covers two
sides and the bottom of a tray container wherein said strengthening
member surfaces are relatively smooth as compared to the irregular
sidewalls of the tray. The strengthening member covering only two
sides and the bottom of the tray allows for display of contained
products through the top and two remaining sides. The addition of
the strengthening member to the tray is achieved through the means
of sealing flange portions of the U-shaped strengthening member to
a flanged rim which terminates the sidewalls of the rectangular
tray. The flanged rim further provides a sealing surface for a film
closure across the top of the tray. This flanged rim of the tray
permits sealing of both the U-shaped strengthening member and the
film closure thereby providing the complete packaging unit which
allows for decoration, content inspection, and a strengthened
container for the purposes of handling and storage.
It is an object of this invention to provide an article of
manufacture comprising, in combination, a tray and strengthening
member which allows for decoration and content inspection. Another
object of this invention is to provide a strengthened tray
container which may be displayed on end or side. Yet another object
of this invention is to provide a tray container which will allow
two sides and the bottom to be decorated on smooth strengthening
member surfaces while providing two sides and the top of the tray
for possible content display. Other aspects, objects, and the
several advantages of the invention will be apparent from a study
of the disclosure, the drawings, and the appended claims.
The article of manufacture according to the invention comprises, in
combination, a rectangular tray having a bottom wall with sloping
sidewalls extending upwardly from the peripheral of the tray bottom
wall terminated in a flat, flanged rim having upper and lower
surfaces; a cover closure film sealed to the upper surface of the
rim; and a U-shaped strengthening member formed of a sheet material
having a first flange portion sealed to the lower surface of the
rim on a first side of the tray and extended downwardly from said
sealed first flange portion across the bottom wall and upwardly to
the lower surface of the rim of a second side of the tray, said
reinforcing member terminated in a second flanged portion sealed to
the lower surface of the rim on the second side of the tray.
Preferably the tray is a thermoformed tray having a rectangular
shape with ribbed, sloping sidewalls and a horizontal rim. The film
closure is sealed to the top of the rim surface and the U-shaped
strengthening member having hot melt adhesive coatings on the
flanged portions is attached to the tray rim by heat sealing to the
bottom surface of the rim on two sides of the tray. Preferably, the
U-shaped strengthening member extends downwardly at right angles
from the rim of the tray across the bottom and upwardly at right
angles to the lower surface of the rim on the opposing rim of the
tray. The preferred U-shaped strengthening member is constructed of
a paperboard. The use of the hot melt coated flange portion of the
board allows for the tray container to be filled and sealed with
the film closure at a time prior to the incorporation and sealing
of the U-shaped strengthening member. However, the board can be
sealed to the tray member at the same time that the film closure is
sealed to the tray.
In the accompanying drawings,
FIG. 1 is an end view of the film closure, rectangular tray having
sloping walls and rim, and the U-shaped strengthening member having
first and second flanged portions, all of which are in position
pior to being sealed in their respective positions.
FIG. 2 is a side view of the sealed tray and strengthening member
comprising the container of the invention.
FIG. 3 is a cross-section view along lines 3--3 of FIG. 2.
Referring now to FIG. 1, there is shown a relatively rigid tray 1,
a U-shaped strengthening member 4 and a cover closure film 6 all in
position prior to forming the container of the invention. Tray 1
has a bottom wall 10, and sidewalls 12 having reinforcing ribs 8
therein. The tray sidewalls 12 terminate in a flanged tray rim 14.
The flanged tray rim 14 has an upper surface 16 and lower surface
18. Te U-shaped strengthening member has a first flanged portion 20
and a second flanged portion 22. The tray 1 is preferably a
thermoformed tray and can be made of any suitable material known in
the art, for example, polyethylene, polypropylene, or other
suitable thermoplastic and/or thermosetting resins. The tray 1 is
provided with a peripheral rim 14 projecting outwardly from the
sidewalls 12 which slope upwardly from the tray bottom wall 10.
Preferably, the tray rim 14 is in a horizontal plane as are the
first and second flanged portions 20 and 22 of the U-shaped
strengthening member 4. The cover closure film 6 can be formed of
any suitable material known in the art, for example, a film of
polyethylene, polypropylene, or similar material, or a laminate of
a thermoplastic film and a sheet of paper and/or metal foil. The
cover closure film 6 is attached to the upper surface of the tray
rim 16 through suitable means such as heat sealing or adhesive
applications. The seal form need not be liquid type for the
packaging of dry products, but a liquid type seal is preferred to
prevent loss of the contents or contamination thereof, especially
in food packaging. The U-shaped strengthening member 4 preferably
has a hot melt adhesive coating on the first and second flanged
portions 20 and 22 for purposes of heat sealing to the lower
surface of the tray rim 18.
Referring now to FIG. 2, there is illustrated a side view of the
sealed container according to the invention. FIG. 3 is a view in
cross-section along lines 3--3 of FIG. 2 which illustrates the
sealed in place cover closure film 6, tray rim 14, and U-shaped
strengthening member 4 and corresponding first and second flanged
portions 20 and 22. Preferably, according to the invention, tray 1
is a thermoformed tray with a flat bottom wall 10 having sidewalls
12 which are reinforced with ribs 8 and terminate in a horizontal
tray rim 14. Preferably, the U-shaped strengthening member has
perpendicular walls to the first and second flanged portions
thereof which are sealably affixed to the horizontal tray rim.
As will be evident to those skilled in the art, many variations and
modifications of this invention can be practiced in view of the
foregoing disclosure. Such variations and modifications are clearly
believed to come within the sphere and scope of the invention.
* * * * *