U.S. patent application number 14/234885 was filed with the patent office on 2014-06-19 for container excellently preventing liquid from dripping.
This patent application is currently assigned to TOYO SEIKAN GROUP HOLDINGS, LTD.. The applicant listed for this patent is Toshirou Washizaki. Invention is credited to Toshirou Washizaki.
Application Number | 20140166607 14/234885 |
Document ID | / |
Family ID | 47600866 |
Filed Date | 2014-06-19 |
United States Patent
Application |
20140166607 |
Kind Code |
A1 |
Washizaki; Toshirou |
June 19, 2014 |
CONTAINER EXCELLENTLY PREVENTING LIQUID FROM DRIPPING
Abstract
A container having a mouth portion forming, on the outer
circumferential surface thereof, a screw thread for fastening a
cap, wherein an arcuate or annular horizontally recessed portion is
formed between the upper end of the screw thread and the upper end
of the mouth portion or in the screw thread, and the angle .theta.
of the upper wall surface of the horizontally recessed portion is
set to be 80 degrees to 150 degrees relative to the vertical
direction. The container has a mouth portion forming, on the outer
circumferential surface thereof, a screw thread for fastening a cap
without forming a coating that covers the mouth portion, and
effectively prevents the liquid contained therein from dripping
along the outer circumferential surface of the mouth portion when
the liquid contained therein is poured out from the mouth
portion.
Inventors: |
Washizaki; Toshirou;
(Kanagawa, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Washizaki; Toshirou |
Kanagawa |
|
JP |
|
|
Assignee: |
TOYO SEIKAN GROUP HOLDINGS,
LTD.
Tokyo
JP
|
Family ID: |
47600866 |
Appl. No.: |
14/234885 |
Filed: |
May 28, 2012 |
PCT Filed: |
May 28, 2012 |
PCT NO: |
PCT/JP2012/063592 |
371 Date: |
January 24, 2014 |
Current U.S.
Class: |
215/44 |
Current CPC
Class: |
B65D 1/023 20130101;
B65D 23/06 20130101; B65D 1/0246 20130101 |
Class at
Publication: |
215/44 |
International
Class: |
B65D 1/02 20060101
B65D001/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 26, 2011 |
JP |
2011-163144 |
Claims
1. A container having a mouth portion forming, on the outer
circumferential surface thereof, a screw thread for fastening a
cap, wherein a horizontally recessed portion which is arcuate or
annular is formed between the upper end of said screw thread and
the upper end of said mouth portion or in said screw thread, and
the angle .theta. of the upper wall surface of said horizontally
recessed portion is set to be 80 degrees to 150 degrees relative to
the vertical direction.
2. The container according to claim 1, wherein said angle .theta.
is set to be 90 degrees to 150 degrees.
3. The container according to claim 1, wherein said horizontally
recessed portion is formed between the upper end of said screw
thread and the upper end of said mouth portion, said horizontally
recessed portion being annular in shape, and said angle .theta.
being set to be 90 degrees to 150 degrees.
4. The container according to claim 1, wherein the distance from
the upper wall surface of said horizontally recessed portion to the
upper end of said mouth portion is in a range of 1 to 2 mm.
5. The container according to claim 1, wherein the depth of said
horizontally recessed portion is in a range of 0.2 to 1.5 mm.
6. The container according to claim 1, wherein said container is
made of a plastic material.
7. The container according to claim 6, wherein said container is
used for containing non-carbonated beverages.
8. The container according to claim 6, wherein said container has
the mouth portion formed in white color, and is used for containing
colored liquids.
Description
TECHNICAL FIELD
[0001] This invention relates to a container having a mouth portion
forming, on the outer surface thereof, a screw thread for fastening
a cap, and, specifically, to a container for containing liquids
such as beverages and liquid seasonings.
BACKGROUND ART
[0002] The containers can be classified into plastic containers,
glass containers, metal containers and the like containers
depending on their materials. The containers formed by using any
material that have now been widely used are having a mouth portion
with which a cap engages by screw. Owing to their excellent sealing
capability, these containers have been widely used for containing
various kinds of liquids such as beverages and liquid
seasonings.
[0003] However, the containers containing liquids are, without
exception, accompanied by a problem of liquid dripping. Therefore,
a contrivance becomes necessary so that, when the liquid contained
in the container is poured out through the mouth portion, the
liquid that is poured out will not drip onto the exterior along the
outer wall surface of the mouth portion of the container.
[0004] A variety of proposals have been made concerning the
containers for effectively preventing the liquid from dripping.
However, many of them are to form a water-repellent coating on the
inner and outer surfaces of the mouth portion of the containers.
For instance, a patent document 1 proposes forming a coating of tin
oxide or titanium oxide on the mouth portion of the containers. A
patent document 2 proposes forming a coating on the mouth portion
of the containers by firing a silicone oil.
PRIOR ART DOCUMENTS
Patent Documents
[0005] Patent document 1: JP-A-2001-97384 [0006] Patent document 2:
JP-A-9-193937
OUTLINE OF THE INVENTION
Problems that the Invention is to Solve
[0007] Forming a water-repellent coating on the mouth portion of
the containers is effective in preventing the dripping of liquid as
is done by the above prior arts. The coating, however, must be
formed by using a special material so as to cover the mouth portion
of the containers involving problems such as an increase in the
cost and clumsy operation for forming the coating. Specifically,
when the screw thread for fastening the cap is formed on the outer
circumferential surface of the mouth portion of the container, the
screw thread extends to nearly the upper end of the mouth portion
of the container. Therefore, the upper end and its vicinity of the
mouth portion of the container become uneven making it further
difficult to form the coating and causing the thickness of the
coating to vary. In this case, if the upper end of the screw thread
is formed at a low position, then it is allowed to increase the
area of the flat side wall surface continuous to the upper end of
the mouth portion of the container and to easily form the coating
causing, however, the mouth portion of the container and the height
of the cap to become unnecessary large, which, therefore, is not
desirable.
[0008] It is, therefore, an object of the present invention to
provide a container having a mouth portion forming, on the outer
circumferential surface thereof, a screw thread for fastening a cap
without forming a coating that covers the mouth portion, and
effectively preventing the liquid contained therein from dripping
along the outer circumferential surface of the mouth portion when
the liquid contained therein is poured out from the mouth
portion.
Means for Solving the Problems
[0009] According to the present invention, there is provided a
container having a mouth portion forming, on the outer
circumferential surface thereof, a screw thread for fastening a
cap, wherein a horizontally recessed portion which is arcuate or
annular is formed between the upper end of the screw thread and the
upper end of the mouth portion or in the screw thread, and the
angle .theta. of the upper wall surface of the horizontally
recessed portion is set to be 80 degrees to 150 degrees relative to
the vertical direction.
[0010] In the container of the present invention, it is desired
that:
(1) The angle .theta. of the upper wall surface of the horizontally
recessed portion is set to be 90 degrees to 150 degrees relative to
the vertical direction; (2) The horizontally recessed portion is
formed between the upper end of the screw thread and the upper end
of the mouth portion, the horizontally recessed portion being
annular in shape, and the angle .theta. of the upper wall surface
of the horizontally recessed portion being set to be 90 degrees to
150 degrees relative to the vertical direction; (3) The distance
from the upper wall surface of the horizontally recessed portion to
the upper end of the mouth portion is in a range of 1 to 2 mm; and
(4) The depth of the horizontally recessed portion is in a range of
0.2 to 1.5 mm.
[0011] Specifically, from the standpoint of very easily forming the
horizontally recessed portion satisfying a predetermined angle
.theta. of intersection, it is desired that:
(5) The container is made of a plastic material.
[0012] It is, further, desired that the container of the present
invention:
(6) Is used for containing non-carbonated beverages; and (7) Has
the mouth portion formed in white color, the container being used
for containing colored liquids.
Effects of the Invention
[0013] The container of the present invention has an annular or
arcuate horizontally recessed portion formed in the outer
circumferential surface of the mouth portion between the upper end
of the screw thread and the upper end of the mouth portion or in
the screw thread. Here, an important feature resides in that the
angle .theta. (hereinafter often angle .theta. of intersection) of
the upper wall surface of the horizontally recessed portion
relative to the vertical direction is set to be 80 degrees to 150
degrees, i.e., set to an angle close to right angle. This makes it
possible to effectively prevent the liquid content from dripping
along the outer circumferential surface of the mouth portion when
the liquid content is being poured out through the mouth portion of
the container. That is, even if the liquid that is poured out drips
along the outer circumferential surface (side wall surface), the
liquid is cut at the portion where the side wall surface intersects
the upper wall surface of the horizontally recessed portion. As a
result, the container is effectively prevented from being fouled
with the liquid that drips.
[0014] Besides, the horizontally recessed portion having the angle
.theta. of intersection that is set as described above can be
easily formed by suitably selecting a mechanical means such as
forming by using a metal mold or a cutting work depending on the
kinds of the container materials. Therefore, the working operation
is very easy as compared to forming the coating by using a special
material effectively avoiding an increase in the cost, too.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a view showing the whole plastic bottle which is a
representative example of the container of the invention.
[0016] FIG. 2 is a view illustrating, on an enlarged scale and in
cross section, the portion A of the bottle of FIG. 1.
[0017] FIG. 3 is a view showing a state where the liquid content is
being poured out by tilting the bottle of FIG. 1.
[0018] FIG. 4 is a view showing a state where the liquid content is
being poured out by tilting the bottle of Comparative Example
without forming the horizontally recessed portion.
[0019] FIG. 5 is a schematic view illustrating the position of the
arcuate recessed portion of when the container of the invention is
a bottle of a square shape.
[0020] FIG. 6 is another view illustrating, on an enlarged scale
and in cross section, the portion A of the bottle of FIG. 1.
MODES FOR CARRYING OUT THE INVENTION
[0021] Referring to FIG. 1 showing a plastic bottle which is a
representative example of the container of the present invention,
the bottle has a mouth portion generally designated at 1 at its
upper portion. The lower part of the mouth portion 1 stretches to a
shoulder portion 3 that curves outward. The shoulder portion 3
stretches to a body portion 5, the lower end of the body portion 5
being closed with a bottom portion 7.
[0022] As will be learned from FIG. 1, a screw thread 10 is formed
on the outer circumferential surface of the mouth portion 1 and
with which a cap engages by screw. A circumferential protuberance
11 is formed under the screw thread 10. Though not shown, a TE band
may be provided at the lower end of the cap that is fitted by
screw. Engagement of the TE band with the circumferential
protuberance 11 creates evidence of not still tampered. Namely, if
the cap is opened, the TE band remains on the container side being
separated away from the cap letting general consumers to know that
the cap was once opened.
[0023] A support ring 13 of a large diameter is formed at the
lowermost part of the mouth portion 1 of the container. The
container can be held and carried by utilizing the support ring
13
[0024] Referring to an enlarged view of FIG. 2 together with FIG.
1, an annular or arcuate horizontally recessed portion 17 is formed
between the upper end 10a of the screw thread 10 and the upper end
15 of the container (bottle). That is, a side wall surface 19
stretches down in the vertical direction from the outer
circumferential edge of the upper end 15 of the mouth portion, and
is continuous, at a point X of intersection, to an upper wall
surface 17a of the horizontally recessed portion 17.
[0025] In the present invention, it is very important from the
standpoint of preventing the dripping of liquid that the upper wall
surface 17a of the horizontally recessed portion 17 has an angle
.theta. of 80 to 150 degrees, preferably, 90 to 150 degrees and,
particularly preferably, 90 to 120 degrees relative to the vertical
direction. With the angle .theta. lying within the above range,
when the container is tilted to pour out the liquid contained
therein, the liquid may flow down to the side wall surface 19 from
the outer circumferential edge of the upper end 15 of the mouth
portion as shown in FIG. 3. In this case, however, the liquid is
cut at the portion (point of intersection) X where the side wall
surface 19 and the upper wall surface 17a of the horizontally
recessed portion 17 are joined together and at where the force that
pushes the liquid against the wall becomes zero. Namely, the liquid
separates away from the container wall and falls down separating
away from the mouth portion 1 of the container. The liquid drips
most at the start of pouring out the liquid in a state where the
container is nearly standing upright or, concretely, at the start
or at the end of pouring out the liquid contained therein. By
forming the horizontally recessed portion 17 having the
above-mentioned angle .theta. according to the present invention,
it is allowed to effectively prevent the liquid from dripping also
at the start or at the end of pouring out the liquid content.
[0026] Here, the recessed portion 17 is horizontal and does not
work as a screw thread.
[0027] If the angle .theta. of intersection is smaller than the
above range, it becomes difficult to remove the metal mold at the
time of forming. Concretely, if the angle .theta. of intersection
is smaller than 80 degrees, it becomes difficult to remove the
metal mold even by such means as forced removal or after-treatment.
Further, if the angle .theta. is larger than the above range, the
side wall surface 19 becomes continuous to the horizontally
recessed portion 17 (ceiling wall 17a) so mildly that the liquid is
not cut at the point X of intersection. The same also holds true
when there is formed no horizontally recessed portion 17; i.e.,
there is no point X of intersection for cutting the liquid (i.e.,
the liquid is not cut). Therefore, either if the angle .theta. is
larger than the above range or if there has been formed no
horizontally recessed portion 17, the liquid drips down from the
side wall surface 19 along the screw thread 10 like the bottle
shown in FIG. 4. Depending on the cases, the liquid that has
dripped down, further, creeps down along the outer surface of the
bottle body portion 5 to foul the entire bottle.
[0028] The horizontally recessed portion 17 is of an annular or
arcuate shape. That is, the horizontally recessed portion 17 is
formed over the whole circumference along the outer circumferential
surface of the mouth portion 1 (annular recessed portion) or is
formed intermittently along the outer circumferential surface of
the mouth portion 1 (arcuate recessed portion). The horizontally
recessed portion 17 of which shape be selected is suitably
determined depending on the shape and use of the container. If the
container of the invention is a round-shaped bottle, for example,
there is no restriction on the direction in which the liquid
content is to be poured out. In this case, therefore, the annular
horizontally recessed portion 17 must be formed over the whole
circumference along the outer circumferential surface of the mouth
portion 1. On the other hand, if the container of the invention is
a square-shaped container as shown in FIG. 5 and, specifically, if
the container is the square-shaped container having groove portions
for gripping formed in the opposing two surfaces of the container
body portion, the directions for pouring out the liquid have been
specified. Therefore, the horizontally recessed portion 17 formed
in the mouth portion 1 does not have to be of an annular shape;
i.e., there may be formed one or a plurality of arcuate
horizontally recessed portions 17 intermittently so as to be in
parallel relative to the side surface of the container body portion
5.
[0029] The container of the present invention should have a shape
which is as sharp as possible at the point X of intersection. For
instance, it is desired that the radius of curvature thereof is not
more than 0.5 mm. When chamfered at the point X of intersection, it
is desired that the chamfering C is as small as possible. If the
point X of intersection is rounded in a large size, the liquid
remaining on the sidewall surface 19 is not cut at the point X of
intersection at the end of pouring the liquid but flows around to
the inside of the horizontally recessed portion 17. It is,
therefore, probable that the liquid may flow down to the portion
where the screw thread 10 is formed passing through the
horizontally recessed portion 17.
[0030] It is, further, desired that the horizontally recessed
portion 17 is formed at a position as close to the upper end 15 of
the mouth portion as possible so far as the sealing is not lost
when the cap is fitted. Concretely, it is desired that a distance L
from the point X of intersection to the upper end 15 of the mouth
portion is in a range of 1.0 to 2.0 mm. If the horizontally
recessed portion 17 is formed at a too low position, the liquid
remains in an increased amount on the side wall surface 19 when
pouring the liquid is discontinued and flows around into the
horizontally recessed portion 17. As a result, the liquid easily
flows through the horizontally recessed portion 17 down to the
portion where the screw thread 10 is formed. Further, if the
horizontally recessed portion 17 is formed too close to the upper
end 15 of the mouth portion, the area decreases in the portion
where the cap that is fitted comes into close contact thereto, and
it becomes difficult to stably maintain the sealing.
[0031] On the other hand, when the distance from the point X of
intersection to the lower surface of the horizontally recessed
portion 17 is regarded to be the height h of the horizontally
recessed portion, there is no specific limitation on the height of
the horizontally recessed portion but it is desired that the
distance L is within the above-mentioned range and the screw thread
is formed at a position which is not too low. When the lower
surface of the horizontally recessed portion 17 and the upper end
10a of the screw thread are formed integrally together as shown in
FIG. 2, the height h of the horizontally recessed portion becomes
the distance of from the point X of intersection to the upper end
10a of the screw thread.
[0032] In the invention, further, it is desired that the depth d of
the horizontally recessed portion 17 is large to some extent so far
as the mouth portion 1 of the container does not lose the strength.
For instance, it is desired that the depth d is in a range of from
0.2 to 1.5 mm. If the horizontally recessed portion 17 is not
sufficiently deep, there occurs the same phenomenon as that of when
the horizontally recessed portion 17 is not formed. That is, if the
liquid that has flown down along the side wall surface 19 flows
around even by a small amount into the recessed portion 17, then
the recessed portion 17 is readily filled up with the liquid that
has flown therein. As a result, the liquid becomes the priming, and
the liquid that has flown down along the side wall surface 19 does
not cut at the point X of intersection but flows down to the
portion where the screw thread 10 is formed. If the depth d is too
large, on the other hand, the strength of the mouth portion 1
decreases at the portion where the horizontally portion 17 is
formed, and the mouth portion 1 tends to be easily broken.
[0033] From the standpoint of preventing the liquid from dripping,
further, it is desired that the outer circumferential edge (portion
that connects to the side wall surface 19) Y of the upper end 15 of
the mouth portion has an angular shape close to the right angle
like the above-mentioned point X of intersection. However, this
portion comes into close contact with the inner surface of the cap
that is fitted to the mouth portion, affects the sealing and may,
further, come in contact with the mouth of a person who attempts to
drink. Therefore, this portion Y may have a curved surface that is
rounded to a suitable degree like the known containers. This is
because, according to the present invention, the liquid is
effectively prevented from dripping due to the formation of the
above-mentioned horizontally recessed portion 17.
[0034] The above description and FIGS. 1 to 5 are concerned to the
example of when the horizontally recessed portion is formed between
the upper end of the screw thread and the upper end of the mouth
portion. As shown in FIG. 6, however, the present invention also
exhibits the effect of preventing the dripping of liquid even by
forming the horizontally recessed portion in the screw thread. In
this case, however, the angle .theta. of intersection of the upper
wall surface of the horizontally recessed portion relative to the
vertical direction is 80 to 150 degrees, preferably, 90 to 150
degrees and, particularly preferably, 90 to 120 degrees.
[0035] In this case, further, though there is no specific
limitation on the height h of the horizontally recessed portion 17,
it is desired that the screw thread is not formed at a too upper
position and a suitable distance is maintained by the screw
thread.
[0036] The FIGS. 1 to 6 are illustrating examples of when the
invention is applied to a plastic bottle. So far as the mouth
portion provided with the screw thread is formed, however, the mode
of the container of the invention is not limited to the bottles
only but can also be applied to the bottle-shaped containers having
wide mouths and to the bag-shaped contains. There is no specific
limitation on the shapes of the containers of the invention,
either.
[0037] The material of the container of the invention is not
limited to the plastic material but may be a glass or a metal.
However, the plastic material is desired from such a standpoint
that the horizontally recessed portion 17 can be easily formed
satisfying the above-mentioned conditions.
[0038] The present invention improves the anti-dripping of liquid
relying on the shape of the mouth portion of the container and,
therefore, is not to specify or limit the contact angle between the
mouth portion of the container and the liquid contained therein.
Besides, the anti-dripping is not limited by the viscosity or
surface tension of the liquid that is contained.
[0039] As the plastic material, there can be used those materials
that have heretofore been used for producing containers for
containing, specifically, liquids, such as polyesters as
represented by polyethylene terephthalate (PET), and polyolefins
like polyethylene and polypropylene. It is also possible to employ
multilayer structures by using a gas-barrier resin such as ethylene
vinyl alcohol resin or an oxygen absorber (oxidizing resin or
transition metal catalyst) in combination with the above resin.
[0040] In order to effectively prevent the liquid from dripping at
the time of pouring out the liquid that is contained according to
the invention, it is desired to so select the shape of the
container and the liquid contained therein that the liquid can be
prevented from dripping most advantageously.
[0041] As the liquid to be contained, there can be selected any of
those having low viscosities through up to those having high
viscosities without special limitation. That is, the carbonated
beverages have carbonic acid dissolved therein and are filled
maintaining head space of some volume whereas the non-carbonated
beverages are nearly fully filled without leaving head space. When
it is attempted to pour the liquid out, first, therefore, the
container is slightly tilted (the container is nearly upright) to
pour out the liquid; i.e., the liquid is very likely to drip down.
The present invention makes it possible to effectively prevent the
liquid from dripping even at the start of pouring out the
non-carbonated beverage.
[0042] In the plastic containers, in general, the mouth portions of
the containers are formed white due to the heat crystallization for
imparting heat resistance. When the liquids that are contained are
colored liquids such as coffee, soy sauce, or various kinds of
juices, fouling of the mouth portion of the container appears very
conspicuous due to the liquid that has dripped. In such cases, the
present invention is very useful in effectively preventing the
liquid from dripping.
[0043] When the liquids to be contained are beverages, it is
desired that the present invention is applied to the bottles having
volumes of not less than 500 ml. Namely, in the case of beverage
bottles of small volumes of about 180 ml, the consumers, in many
cases, drink the contents directly from the mouth portion of the
containers. As the volumes of the containers increase, however, the
consumes drink the liquid contents by once transferring them into a
cup inviting, therefore, the occurrence of liquid dripping. It is,
therefore, also effective to apply the present invention to the
beverage bottles of large volumes.
EXAMPLES
[0044] Excellent effects of the invention will now be described by
way of the following experiments.
[0045] In the experiments, preventing the liquid from dripping was
tested as described below.
(Testing the Liquid Drip Prevention)
[0046] PET bottles of a volume of 500 ml were used as sample
bottles by changing only the mouth portion that formed the screw
thread. The bottles were each filled with 498 ml of coffee
{viscosity at 25.degree. C.: 10 mPaS (B-type viscometer)} as the
liquid content.
[0047] The positions of the center of gravity and the tilted angles
were recorded as data every time based on the human operation for
pouring out the liquid by hand. By using a jig (6-axis-controlled
robot manufactured by Yasukawa Denki Co.), each of the samples was
moved and turned to observe the state of liquid dripping with the
eye. The samples that permitted the liquid to fall down to the
portion where the screw thread was formed were evaluated to be X
(poor) and the samples that have cut the liquid at the point X of
intersection were evaluated to be .largecircle. (good).
Example 1
[0048] The specifications of the mouth portion were set as
described below.
Specifications of the mouth portion (whitened due to the heat
crystallization): [0049] Distance between the point X of
intersection and the upper end 10a of the screw thread (height h of
the horizontally recessed portion 17): 1.35 mm Angle .theta.
intersected by the horizontally recessed portion 17 and the side
wall surface 19: 120 degrees Radius R of curvature at the point X
of intersection: 0.1 [0050] Distance L between the point X of
intersection and the mouth portion 15: 1.25 mm [0051] Depth d of
the horizontally recessed portion 17: 1.0 mm
Example 2
[0052] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0053] Angle .theta. intersected by
the horizontally recessed portion 17 and the side wall surface 19:
150 degrees
Example 3
[0054] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0055] Distance L between the point X
of intersection and the mouth portion 15: 2.00 mm
Example 4
[0056] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0057] Distance L between the point X
of intersection and the mouth portion 15: 1.00 mm
Example 5
[0058] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0059] Radius R of curvature at the
point X of intersection: 0.5
Example 6
[0060] Example 1 was followed but changing the specifications of
the mouth portion as follows:
[0061] Chamfer C at the point X of intersection: 0.3
Example 7
[0062] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0063] Depth d of the horizontally
recessed portion 17: 0.2 mm
Example 8
[0064] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0065] Depth d of the horizontally
recessed portion 17: 1.5 mm
Example 9
[0066] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0067] Angle .theta. intersected by
the horizontally recessed portion 17 and the side wall surface 19:
86 degrees
Comparative Example 1
[0068] A conventional bottle without the step (horizontally
recessed portion) was used to evaluate.
Comparative Example 2
[0069] Example 1 was followed but changing the specifications of
the mouth portion as follows: [0070] Angle .theta. intersected by
the horizontally recessed portion 17 and the side wall surface 19:
160 degrees
[0071] Table 1 shows the results of testing the liquid drip
prevention by using the sample bottles having the above-mentioned
mouth portions.
TABLE-US-00001 TABLE 1 Example Comp. Example Item 1 2 3 4 5 6 7 8 9
1 2 Intersecting angle .theta. 120 150 120 120 120 120 120 120 86
-- 160 Radius of curvature or R0.1 R0.1 R0.1 R0.1 R0.5 C0.3 R0.1
R0.1 R0.1 -- R0.1 chamfer at point X Distance L (mm) 1.25 1.25 2.0
1.0 1.25 1.25 1.25 1.25 1.25 -- 1.25 Depth d (mm) 1.0 1.0 1.0 1.0
1.0 1.0 0.2 1.5 1.0 -- 1.0 No dripping .largecircle. .largecircle.
.largecircle. .largecircle. .largecircle. .largecircle.
.largecircle. .largecircle. .largecircle. X X
DESCRIPTION OF REFERENCE NUMERALS
[0072] 1: mouth portion of the container [0073] 10: screw thread
[0074] 10a: upper end of the screw thread [0075] 15: upper end of
the mouth portion [0076] 17: horizontally recessed portion [0077]
17a: upper wall surface of the horizontally recessed portion [0078]
19: side wall surface [0079] .theta.: Angle intersected by the
upper wall surface 17a and the side wall surface 19
* * * * *