Patent Grant
7011226
1. Field of the Invention
The present invention relates to a plugging member and a container, and more particularly to a plugging member which plugs a draining port for draining a material which is contained in a container, and the container. For example, the plugging member is used to plug a draining port of a photographic processing chemicals container which contains therein photographic processing chemicals.
2. Description of the Related Art
As an example of a conventional plugging member, a plugging sheet 300 as a plugging element which plugs a bottle is shown in
In this plugging sheet 300, three fan portions 306 are formed from three radial portions 302 which comprise thin portions and three circumferential portions 304 which comprise thin portions. Each of the fan portions 306 is attached to a plugging element 310 by attaching portions 308.
When this plugging sheet 300 is pressed and perforated by a protruding portion of a perforating means which is not shown, since splits are formed from the center of the plugging sheet 300 along the radial portions 302 and then, the splits extend along the circumferential portions 304, respectively, the plugging sheet 300 is opened over the entire cross section of the opening of the bottle.
However, in this plugging sheet 300, since the thin portions are curved at a small radius of curvature from the radial portions 302 to the circumferential portions 304, there may be cases in which the force which has acted upon the radial portions 302 does not extend to the circumferential portions 304. For this reason, when the amount of pressing force excited by the perforating means is small, the splits do not extend from the tip ends of the radial portions 302 to the circumferential portions 304, and the fan portions 306 are bent at positions indicated by a dashed line C6 in
This plugging sheet 300 is formed from a high polymer material or a mixture of high polymer materials. Three fan portions 306 are formed by three radial portions 302 which have a thickness of between 0.1 and 0.3 mm and by three circumferential portions 304 which have a thickness of between 0.1 and 0.3 mm, similarly to the thickness of the three radial portions 302. The fan portions 306 are each attached to a plugging element 310 by the attaching portions 308.
When this plugging sheet 300 is pressed and perforated by the protruding portion of a perforating means which is not shown, since splits extend from the center of the plugging sheet 300 along the radial portions 302, and then extend along the circumferential portions 304, the plugging sheet 300 is opened over the entire cross section of the opening of the bottle.
However, in this plugging sheet 300, if the thicknesses of the plugging sheet 300 in the areas adjacent to the radial portions 302 and the circumferential portions 304, each of which has a thickness of between 0.1 mm and 0.3 mm, is close to the thicknesses of the radial portions 302 and the circumferential portions 304 (if, for example, the thickness of the radial portions 302 and the circumferential portions 304 of 0.3 mm and the thickness of the fan portions 306 is 0.4 mm), a portion of the tensional force which is supposed to act upon the radial portion 302 or the circumferential portions 304 due to the pressing force from the perforating means is dispersed and acts upon the fan portions 306. Accordingly, the fan portions 306 are thereby stretched out together with the radial portions 302 or the circumferential portions 304. As a result, in order to perforate the plugging sheet 300, a large amount of pressing force is needed.
In view of the aforementioned facts, it is an object of the present invention to obtain a plugging member which can open a draining port wide with a low pressing force, and a container whose draining port is plugged by this plugging member.
The first aspect of the present invention is a plugging member which plugs a draining port for draining a material which is contained in a container, comprising: a plugging plate body which is mounted in the draining port and is able to plug the draining port; and a thin portion which is formed by decreasing the thickness of the plugging plate body in portions in the thickness direction thereof, using a concave portion which is formed linearly on one end surface of the plugging plate body in the thickness direction thereof and which is formed with a predetermined width or with a width which decreases from the one end surface to the other end surface of the plugging plate body in the thickness direction thereof, wherein the thinnest portion of the thin portion has the thickness T2 which ranges from not less than 0.05 mm to not more than 0.7 mm, the surfaces which face each other and form the concave portion are in parallel with each other, or the angle θ which is formed by the facing surfaces is more than 0° and equal to or less than 120°, and the ratio (L/T2) of the thickness L of the plugging plate body to the thickness T2 is equal to or more than 2.
In the state in which the plugging member is attached to the draining port, the draining port is plugged by the plugging plate body. In this state, when the substantially central portion of the plugging plate body is pressed by the pressing means such as a bar or the like, the tensional force acts upon portions of the plugging plate body at both sides of each of the thin portions in the direction in which the portions of the plugging plate body are made to separate from each other.
The ratio (L/T2) of the thickness L of the plugging plate body to the thickness T2 which is the thinnest portion of the thin portion is equal to or more than 2. As compared to the thin portion, the portion of the plugging plate body on which a concave portion is not formed has a thickness which is equal to or more than a predetermined value. The opposite surfaces forming a concave portion are made to be in parallel with each other, or approach to each other so that the angle θ which is formed by the opposite surfaces is more than 0° and is equal to or less than 120°. The plugging plate body has a predetermined thickness at both side portions of the thin portion (on which the sloping surfaces are formed). For this reason, the tensional force generated from both side portions of the thin portion is concentrated at the thin portion. Since the thickness T2 of the thinnest portion of the thin portion is equal to or less than 0.7 mm, the plugging plate body is broken along the thin portion by the tensional force which has concentrated at the thin portion.
The thickness T2 of the thinnest portion of the thin portion is equal to or more than 0.05 mm, and a predetermined strength is secured. Therefore, in the state in which the draining port is plugged by the plugging member, when the pressing force acts upon the plugging member due to an increase in the internal pressure of the container, the plugging plate body does not unexpectedly break.
Examples of the cross sectional configuration of the concave portion which is formed by decreasing the thickness of the plugging plate body in portions may include: a rectangular shape in which the surfaces facing each other and forming the concave portion are in parallel with each other; a substantially trapezoidal shape in which the opposite surfaces gradually approach to each other toward the other end surface of the plugging plate body; and a substantially V-shape in which the end portions of the opposite surfaces contact with each other.
The second aspect of the present invention is a plugging member according to the first aspect of the present invention, wherein a low strength portion is formed at the thin portion by decreasing the strength of the thin portion within a predetermined range from the center of the plugging plate body.
When the plugging plate body is pressed by the pressing means, firstly, the low strength portion is broken, and then, the broken portion extends to the portion of the plugging plate body other than the low strength portion (outside the predetermined range from the center of the plugging plate body). For this reason, over the entire body of the plugging plate body, the plugging plate body can be broken with an even smaller amount of pressing force as compared to the plugging plate body on which the low strength portion is not formed.
In the thin portion other than the low strength portion, since the thin portion has a strength which is higher than the low strength portion, for example, the plugging plate body is not broken unexpectedly due to the increase of the internal pressure of the container.
The third aspect of the present invention is a plugging member according to the first aspect of the present invention, wherein three or more of the thin portions are formed, and portions of these thin portions are low strength portions whose strength is made lower than the other thin portions.
When the plugging plate body is pressed by the pressing means, the low strength portions are broken, and then, the broken portion extends to the portions of the plugging plate body other than the low strength portions. For this reason, over the entire body of the plugging plate body, the plugging plate body can be broken with a much more smaller amount of pressing force as compared to the plugging plate body on which the low strength portions are not formed.
Since the thin portions other than the low strength portions have a strength which is higher than the low strength portions, for example, the plugging plate body is not broken unexpectedly due to an increase of the internal pressure of the container or the like.
One low strength portion or a plurality of low strength portions can be provided. Further, low strength portions may be formed by applying different strengths to three or more of thin portions.
The fourth aspect of the present invention is a plugging member according to the third aspect of the present invention, wherein a high strength portion is formed on the thin portions by increasing the strength of the thin portions outside a predetermined range from the center of the plugging plate body.
Firstly, the low strength thin portions are broken by the pressing force of the pressing means. However, the breaking is obstructed by the high strength portions which are formed in the low strength thin portions. The tensional force acting upon the thin portions by the pressing force of the pressing means extends to the thin portions other than the aforementioned portions (the portions other than the low strength thin portions). Namely, the tensional force due to the pressing force of the pressing means is dispersed to and acts upon a plurality of thin portions (including the low strength thin portion) at different times so that all of the thin portions can be broken.
The fifth aspect of the present invention is a plugging member according to the first to fourth aspects of the present invention, wherein the plugging plate body is formed in a disc plate shape whose outer diameter R is not less than 0.5 cm and not more than 5 cm.
Accordingly, the plugging plate body has a predetermined strength, and the thin portion can be broken with a small amount of the pressing force.
The sixth aspect of the present invention is a plugging member which plugs a draining port for draining a material which is contained in a container, comprising: a plugging plate body which is mounted in the draining port and is able to plug the draining port; and a low strength portion which is formed on the plugging plate body where the strength of the plugging plate body is decreased by a plurality of radial portions which are formed radiating out from substantially the central portion of the plugging plate body toward the external edge thereof, a plurality of curved portions which are formed so as to be curved in an arcuate shape and continue from the tip end of each of the radial portions, and a plurality of circumferential portions which are formed so as to extend from the tip end of each of the curved portions in the direction along the edge of the opening of the draining port.
In the state in which the plugging member is mounted in the draining port, the plugging plate body plugs the draining port. In this state, when substantially the central portion of the plugging plate body is pressed by the pressing means such as a bar or the like, then at substantially the central portion of the plugging plate body, tensional force acts upon portions of the plugging plate body on both sides of each of the radial portions in the longitudinal direction thereof in the direction in which the portions of the plugging plate body are made to separate from each other, and substantially the central portion of the plugging plate body splits along the radial portions. This split extends to the outer edge of the plugging plate body along the radial portions, and further extends to the circumferential portions by way of the curved portions.
Since the circumferential portions are formed in the same direction as the edge of the opening of the draining port, the plugging plate body is broken along the edge of the opening of the draining port at portions where these circumferential portions are formed. For this reason, the plugging plate body is opened wide along the edge of the opening of the draining port.
Further, the radial portions and the circumferential portions are connected to each other, through the curved portions each of which is curved in an arcuate shape. Accordingly, the radial portions and the circumferential portions are not structured such that they deviate so as to connect to each other. For this reason, even if the pressing force by the pressing means is low, the tensional force, which has acted upon the respective radial portions, also acts upon the respective circumferential portions and the plugging plate body can thereby be broken along the circumferential portions.
The radial portions are not necessarily formed radiating from the center of the plugging plate body, and instead may be formed radiating from the substantially central portion (at a position slightly displaced from the center) of the plugging plate body provided that the plugging plate body is split along the radial portions by the pressing force from the pressing means.
The seventh aspect of the present invention is a plugging member according to the sixth aspect of the present invention, wherein the low strength portion is a groove which is formed by decreasing the thickness of the plugging plate body in portions.
By forming a groove on the plugging plate body, the cross sectional area of the plugging plate body in the groove portion decreases. Accordingly, the tensional force is concentrated in the groove portion, and the plugging plate body is broken along the groove. In this way, the low strength portion can be formed by a simple structure in which the groove is formed by decreasing the thickness of the plugging plate body in portions.
Other than the structure in which the thin portion is formed so as to be in continuous, the groove of the present invention may be formed by a structure in which the thin portion is formed intermittently at a predetermined distance so as to form as a whole a series of perforation.
The eighth aspect of the present invention is a container in which a draining port for draining a material contained therein is formed, and the draining port is plugged by the plugging member according to the first to seventh aspects of the present invention.
Because the draining port of the container is plugged by the plugging member, the material contained in the container does not leak from the container. Since air or the like does not flow into the container, changes in the characteristics or properties of the material contained therein can be prevented.
In the state in which the plugging member is attached to the draining port, namely, without detaching the plugging member from the draining port, the substantially central portion of the plugging plate body is pressed by the pressing means such as a bar or the like. The plugging plate body is opened wide along the edge of the opening of the draining port, and the material contained in the container can be emptied out.
The ninth aspect of the present invention is a container according to the eighth aspect of the present invention, wherein the container is used for the purpose of containing therein photographic processing chemicals.
The photographic processing chemicals do not leak from the container, and change in the characteristics or properties of the material contained in the container can be prevented.
In the state in which the plugging member is attached to the draining port, the substantially central portion of the plugging plate body is pressed by a pressing means such as a bar or the like. The plugging plate body is opened wide along the edge of the opening of the draining port, and the photographic processing chemicals can be emptied out.
A packing 10, a cap 12 in which the packing 10 is mounted, and a photographic processing chemicals container 14 (a container for containing a photographic processing chemicals) to which this cap 12 is attached, according to a first embodiment of the present invention are shown in
The entire body of this photographic processing chemicals container 14 is formed in a substantially rectangular cylindrical shape, and a cylindrically-shaped portion 16 is formed at one end of the container 14 in the axial direction thereof (at the upper end in
As shown in
As shown in
An annular ring 28 is formed integrally with the anchoring cylindrical portion 22 at one end in the axial direction thereof (the upper end in
In the state in which the packing 10 is mounted in the packing mounting portion 32, a clearance of a predetermined distance is formed between the external circumferential surface of an insertion cylindrical portion 36 and the internal circumferential surface of the attachment cylindrical portion 20. When the cap 12 is screwed onto the cylindrical portion 16 of the photographic processing chemicals container 14, and is attached to the draining port 18, the upper portion of the cylindrical portion 16 enters into the aforementioned clearance. As a result, the insertion cylindrical portion 36 is inserted into the draining port 18 (at the inside of the cylindrical portion 16) with no clearance. Accordingly, the external circumferential surface of the insertion cylindrical portion 36 and the internal circumferential surface of the cylindrical portion 16 contact with each other, and the position of the packing 10 in the radial direction of the photographic processing chemicals container 14 is fixed. Further, since the outer edge of a sealing disc portion 34 is nipped between the bottom surface 28B of the ring 28 and the upper surface of the cylindrical portion 16, the position of the packing 10 in the axial direction of the photographic processing chemicals container 14 is fixed. Moreover, in this state, when the cap 12 in which the packing 10 is mounted is attached to the draining port 18, the draining port 18 is plugged by the packing 10.
A protruding wall 30 is formed so as to protrude from the top surface 28A of the ring 28 over the entire circumference of the ring 28.
The cross section of the protruding wall 30 is formed in a substantially triangular shape having a guiding surface 30A and a sloping surface 30C. As seen from the cross section, the guiding surface 30A is parallel with axis J1. The sloping surface 30C extends from a protruding tip 30B towards the radial external side of the ring 28 as it approaches the top surface 28A of the ring 28. By forming the protruding wall 30 having the configuration described above so as to protrude from the top surface 28A, then in a state where the draining port 18 faces downward, and the photographic processing chemicals container 14 is held such that the axis J1 corresponds to the vertical direction of the photographic processing chemicals container 14 (see
The packing 10 is formed from unfoamed resin. The resin contains 50% or more of low density polyethylene (LDPE) whose density range is determined to be between 0.910 and 0.929 (g/cm3) in JIS K 6748-1982, or similarly, 50% or more of high density polyethylene (HDPE) whose density range is determined to be equal to or more than 0.942 (g/cm3) in JIS K 6748-10.982. As shown in
As shown in
As shown in
As shown in
The length L1 of each of the radial grooves 52 has a predetermined, length such that the tip end 52A of the radial groove 52 does not extend to the arcuate thin portion 46 (i.e., the length of the radial groove portion 52 is smaller than the radius of the sealing disc portion 34). More specifically if the internal circumference of the flange 38 (a circle which is formed by the circular arc portions 46A of the arcuate thin portions 46) is R1, then preferably,
0≦L1≦(4/5)×R1
from a standpoint of perforation performance (splittability of the groove 50) which will be described later, and more preferably,
(1/5)×R1≦L1≦(2/3)×R1.
Moreover, in the case of L1=0, it means that there are no linear radial grooves 52, and the curved grooves 54 are formed so as to extend directly from the center of the sealing disc portion 34. Accordingly, these curved grooves 54 equate to both the radial portions and the curved portions of the present invention. In the packing 10 according to the present embodiment, R1=13 mm, and L1=5 mm.
As shown in
The thickness T2 of the low strength portion 64 is set to range from not less than 0.05 mm to not more than 0.7 mm. Further, the thickness T2 is set such that the ratio of the plate thickness L of the sealing disc portion 34 to the thickness T2 of the low strength portion 64 (L/T2) is 2 or more.
As shown in
The radius of curvature R2 of the curved groove 54 is appropriately determined from a standpoint of perforation performance or the like which will be described later. However, preferably,
R1/5≦R2,
and more preferably,
R1/5≦R2≦R1/2.
In the packing 10 according to the present embodiment, R2=5 mm.
If the curved groove 54 is thought of as being divided into micro portions, in these micro portions, it is not necessary to maintain the radius of curvature R2 constant. The respective micro portions may have different radii of curvature R2 or a portion thereof may be formed by a straight line connecting internal portions of the arc provided that the smoothness of the curved groove 54 as a whole is not lost.
As shown in
Either one of the pair of sloping surfaces 60 which are shown in
As shown in
Next, a description of a direction in which photographic processing chemicals are drained from the photographic processing chemicals container 14 whose draining port 18 is plugged by the packing 10 according to the present embodiment, and an operation of the packing 10 will be given.
A photographic processing chemicals supplying device 70 in the automatic developer is schematically shown in
In order to supply the photographic processing chemicals from the photographic processing chemicals container 14 into the automatic developer, as shown in
Next, an unillustrated controller rotates a pinion inside a driving portion 78 and raises an elevating portion 80. The perforating pipe 76 extending from the elevating portion 80 is thereby raised, and the tip end of the perforating pipe 76 pushes up the central portion of the packing 10 which plugs the draining port 18.
As shown in
Generally, when a member with a fixed thickness is pressed in the direction of that thickness and is broken, the maximum amount of pressing force (perforation force) is needed at the initial stage of the pressing, i.e., immediately before and after perforation starts. In the packing 10 according to the present embodiment, among the thin portions 62, low strength portions 64 are formed at portions of the thin portions 62 within the range indicated by the double-dashed line C1 in
As shown in
As can be seen from
Among the thin portions 62 which are formed by the curved grooves 54, the thickness of a portion of each of the thin portions 62 outside the range indicated by the double-dashed line C2 in
When splits further expand along the thin portions 62, and the sealing disc portion 34 is broken, because the thin portions 62 (the circumferential grooves 56) are formed along the external circumference of the sealing disc portion 34, as shown in
In this way, in the packing 10 according to the present embodiment, curved grooves 54, which continue on smoothly without deviation from the radial grooves 52, and circumferential grooves 56, which continue on smoothly without deviation from the curved grooves 54 along the external circumference of the sealing disc portion 34, are formed on the sealing disc portion 34 for plugging the draining port 18 of the photographic processing chemicals container 14. As a result, the sealing disc portion 34 can be opened wide with a small amount of pressing force.
In the packing 10 according to the present embodiment, since the low strength portions 64 are formed at portions within a predetermined range from the center thereof (within the range indicated by the double-dashed line C1 which is shown in
Further, because the strength at portions of the thin portions 62 within the range between the double-dashed line C1 and the double-dashed line C2 is not reduced, the sealing disc portion 34 maintains a constant strength. Accordingly, due to, for example, a change or the like of the internal pressure of the photographic processing chemicals container 14, even if the sealing disc portion 34 is pressed outwardly or inwardly of the photographic processing chemicals container 14, the sealing disc portion 34 is not broken unexpectedly. Especially when the photographic processing chemicals container 14 is dropped, the internal pressure of the container 14 may increase temporarily, however, even in this case, the sealing disc portion 34 is not broken.
In the packing 10 according to the present embodiment, since the outer diameter of the sealing disc portion 34 is between not less than 0.5 cm and not more than 5 cm, the sealing disc portion 34 stretches appropriately due to pressing force from the pressing means (however, it does not stretch excessively), the sealing disc portion 34 can be broken with a small amount of pressing force.
As described above, in the packing 10 according-to the present embodiment, opposing properties can be realized, namely, that a predetermined amount of strength is maintained in the sealing disc portion 34, and the pressing force which is needed by the pressing means to perforate this sealing disc portion 34 (i.e., the perforating force of the perforating pipe 76) can be minimized.
A packing 110 according to the second embodiment of the present invention is shown in
In this packing 110, as shown in
Generally, the relationship which is shown in
Conversely, the relationship between the distance moved and the pressing force of the perforating pipe 76 when a sealing disc portion 116 of the packing 110 is pressed and broken by the perforating pipe 76 is shown in
Accordingly, when the center of the sealing disc portion 116 of the packing 110 is pressed by the perforating pipe 76, splits are formed at the thin portions 114A and 114B (the low strength thin portions) and the sealing disc portion 116 is thereby broken. When the splits extend to the portions near the external circumference of the sealing disc portion 116, since the amount of pressing force which is needed to form splits at the thin portions 114A and 114B (see
Among the four thin portions 114A, 114B, 114C and 114D, by making the two thin portions 114A and 114B low strength portions whose strength is lower than the other thin portions 114C and 114D, the tensional force which acts upon the fan portions 58 adjacent to each other by the pressing force of the pressing means can be dispersed at different times. Accordingly, the sealing disc portion 116 can be broken with a small amount of pressing force. Further, splits can be first induced at the thin portions 114A and 114B by making the thin portions 114A and 114B low strength portions. Accordingly, since the thickness of the other thin portions 114C and 114D can be made relatively larger, it is possible to make the thickness of all four thin portions 114A, 114B, 114C and 114D larger. For this reason, the strength of the sealing disc portion 116 can be kept constant and even when the sealing disc portion 116 is pressed inwardly or outwardly of the photographic processing chemicals container 14, the sealing disc portion 116 does not unexpectedly break.
In order to disperse the tensional force acting upon the fan portions 58 adjacent to each other, it is not necessary to reduce the strength of two of the plurality of thin portions and instead, the strength of one thin portion or three or more of the thin portions may be made to be lower than the other thin portions. Further, when the number of thin portions is equal to or more than three (accordingly, the number of the fan portions 58 is equal to or more than three), the above-described effect which is obtained by forming low strength thin portions (the tensional force acting upon the fan portions 58 is dispersed at different times) can be accomplished.
As shown in
By forming the high strength portions 118 at the four thin portions 114A, 114B, 114C, and 114D, it is thereby possible to prevent splits from being formed only at the thin portions 114A and 114B having low strength. Splits can reliably be formed at the four thin portions 114A, 114B, 114C, and 114D so that the sealing disc portion 116 can be broken.
Instead of the high strength portions 118 which are shown in
A packing 130 as an another example is shown in
In the above description, as is also shown in
As to the structure in which the thin portions 62, 114, and 136 have low strength or high strength partially or locally, an example of the structure in which the thicknesses of the thin portions 62, 114, and 136 are increased or decreased by changing the angle θ which is formed by the sloping surfaces 60 has been explained. However, the structure in which each of the thin portions 62, 114, and 136 has low strength or high strength partially or locally is not limited to this. For example, as described above, in the case where the bottom ends 60A of the sloping surfaces 60 are separated from each other by a predetermined distance and each of the thin portions 62, 114 and 136 has the flat portion 66 having a predetermined width, it is possible for each of the thin portions 62, 114 and 136 to have low strength or high strength partially or locally by also changing the width of the flat portion 66. Namely, if the width of the flat portion 66 of each of the thin portions 62, 114 and 136 is made narrower (including the sloping surfaces 60 without a flat portion 66 therebetween, as is shown in
The thin portions 62, 114, and 136 do not necessarily have low strength or high strength partially or locally and instead may have constant strength (thickness T2 or T4) from the center of the sealing disc portion 34 to the outer circumference thereof. Namely, even in this case, provided that the curved grooves 54 which continue in a smooth without deviation from the extending ends 52A of the radial grooves 52 are formed and, provided that the circumferential grooves 56 which continue in a smooth arcuate shape without deviation from the curved grooves 54 along the outer circumference of the sealing disc portion 34 are formed, the sealing disc portion 34 can be opened wide with a small amount of pressing force.
The thin portions 62, 114 and 136 may have a constant strength (constant thickness T4). Namely, even in this case, in the same manner that the ratio (L/T2) of the thickness L of the sealing disc portion 34 to the thickness T2 of the low strength portion 64 is set to be equal to or more than 2, (L/T4) is set to be equal to or more than 2, and the sealing disc portion 34 can thereby be opened wide with a small amount of pressing force.
The number of each of the grooves 50, 112 and 134 is not limited to the above-described number of four. However, even if the pressing force is weak, in order to open the sealing disc portion 34, 116 and 132 widely, the number of grooves is preferably three to five, and more preferably four. Conversely, if the number of the grooves 50, 112, and 134 is six or more, after the opening, the fan portions 58 (see
The grooves 50, 112, and 134 do not need to be formed in a continuous linear shape and, for example, may be formed intermittently at predetermined distances in the longitudinal direction thereof so as to form, as a whole, a series of perforations.
The low strength portions according to the present invention are not limited to the grooves 50, 112, and 134 or grooves which are formed in a perforated shape. For example, a portion, which may be split by the pressing force of the pressing means, can be formed by changing the physical properties of the sealing portions 34, 116, and 132. An example of this is the weld line. A weld line is formed during injection molding of a resin molded product when resin which has flowed out of the gate and diffused around the gate rebonds inside the die. Namely, at portions where a weld line is formed, in many cases, the strength of the resin is deteriorated. Accordingly, molding conditions, the position of the gate, or the like should be set appropriately so that weld lines are formed in the same shape as the thin portions when seen in a plan view.
As described above, the sealing disc portion can be broken along a weld line simply by forming the weld line, however, by further forming the grooves 50, 112, and 134 at the portions where weld lines are formed, it is possible to form a packing which can open with a smaller amount of pressing force.
In the above description, an example in which each of the packings 10, 110, and 130 is formed separately from the cap 12 has been explained. However, the respective packings 10, 110, and 130 may be integrated with and the cap 12. In this way, when each of the packings 10, 110, and 130 are integrated with the cap 12 and, each of the packings 10, 110, and 130 does not fall from the cap 12.
In the above description, an example of the photographic processing chemicals container 14 in which the photographic chemicals are contained has been explained. However, the present invention is not limited to this and instead, any type of container can be used.
As photographic processing chemicals contained in the photographic processing chemicals container 14, for example, a color developing solution, a black & white developing solution, a bleaching solution, a fixing solution, or the like can be listed. These photographic processing chemicals are used to treat a halogen silver photosensitive material, are commercially available, and are known.
In the above description, as a material which forms the packings 10, 110, and 130, unfoamed resin which contains 50% or more of low density polyethylene (LDPE) or 50% or more of high density polyethylene (HDPE) has been listed. However, of course, the present invention is not limited to this and instead, materials are appropriately determined by taking chemical resistance, physical strength, or the like of the materials to be contained in the container into consideration. As described above, when the photographic processing chemicals container 14 in which the photographic processing chemicals are contained is used, from a standpoint of chemical resistance or physical strength, polyethylene is listed as one of the preferable materials.
Especially, in the case in which the packing is formed from a resin material which contains a large amount of low density polyethylene (LDPE), as compared to when the packing is formed from a resin material which contains high density polyethylene (HDPE), because the resin itself is soft, the packing is apt to elongate. Accordingly, the central portion of each of the sealing disc portions 34, 116, and 132 can be broken with a low pressing force. Further, due to the softness of the resin itself, when the distance moved by the perforating pipe 76 is short, it is possible that the central portions of the sealing disc portions 34, 116, and 132 are in an elongated state but are not broken. Even in this case, by providing a sufficient moving distance for the perforating pipe 76, splits which have been formed on the sealing disc portions 34, 116, and 132 are extended to the outside of each of the sealing disc portions 34, 116, and 132 in the radial direction thereof and the sealing disc portions 34, 116, and 132 can be opened wide. Moreover, due to the softness of resin itself, because the sealing disc portions 34, 116, and 132 are apt to elongate, for example, if the photographic processing chemicals container 14 is dropped, even if the internal pressure of the container 14 changes, this change of the internal pressure can be absorbed by the sealing disc portions 34, 116, and 132 being elongated, and packings 10, 110, and 130 which are not broken unexpectedly can be formed.
On the other hand, if the packings 10, 110, and 130 are formed from a resin material which contains a large amount of high density polyethylene (HDPE), as compared to when the packings 10, 110, and 130 are formed from a resin material which contains a large amount of low density polyethylene (LDPE), the resin itself is hard. Accordingly, at the initial stage of breaking the sealing disc portions 34, 116, and 132, a larger amount of pressing force is needed. However, once splits are formed on the sealing disc portions 34, 116, and 132 (the sealing disc portions 34, 116, and 132 are broken), the entire body of each of the sealing disc portions 34, 116, and 132 deforms, and perforating force (tensional force) acts upon the thin portions 62 which are structured by the grooves 50. Accordingly, even if the distance moved by the perforating pipe 76 is small, it is possible to open the sealing disc portions 34, 116, and 132 wide. Further, because the resiliency of the resin material itself is lower than a resin material which contains a large amount of low density polyethylene (LDPE), when each of the sealing disc portions 34, 116, and 132 are opened, due to the resiliency, it becomes difficult for the fan portions 58 to return to the original position they were in before the sealing disc portions were opened so that each of the sealing disc portions 34, 116, and 132 is held in an open shape. For this reason, a clearance which is formed between the fan portions 58 and the perforating pipe 76 due to liquid pressure or the like, when the material contained in the container (photographic processing chemicals or the like) is drained does not decrease, and the draining of the contents can be ensured.
The above-described conditions may be realized by using a resin which contains a large amount of middle density polyethylene (MDPE) having a density range of between 0.930 and 0.941 (g/cm3) in JIS K 6748-1982.
As described above, a method of opening the packing 10, 110, and 130 is not limited to the case in which the photographic processing chemicals container 14 is set in the photographic processing chemicals supplying device 70 (see
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-105787 | Mar 1998 | JP | national |
| 10-105788 | Mar 1998 | JP | national |
This application is a continuation application of application Ser. No. 09/274,319, filed on Mar. 23, 1999 now abandoned.
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| Number | Date | Country |
|---|---|---|
| 2820566 | Nov 1979 | DE |
| 339729 | Nov 1989 | EP |
| 1049694 | Dec 1953 | FR |
| 2 716 669 | Sep 1995 | FR |
| 1441819 | Jul 1976 | GB |
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| Number | Date | Country | |
|---|---|---|---|
| 20030196984 A1 | Oct 2003 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 09274319 | Mar 1999 | US |
| Child | 10443769 | US |
