JP5717532B2 - Grease container and pail can lid closing method - Google Patents

Description

  The present invention relates to a grease container for storing grease, for example.

  For example, a steel pail can defined in JIS Z 1620 is often used as an example of a container for storing lubricating grease. As specified in JIS Z 1620, there are various types of pail cans, and one of them is provided with a pawl (lug) 4 on the outer periphery of the canopy 2 as shown in FIG. There is a lug type in which the canopy 2 with the removable claw is fastened to the body by the claw 4.

Moreover, generally the opening side edge part 1a of the container trunk | body 1 in a pail can is called what is called curl, and the curl process is made | formed. In a pail can in which the canopy 2 is detachable, the canopy 2 has a groove 2b on the inner surface 2a along the periphery of the canopy so that it can be fitted to the curled opening end 1a. A gasket 3 is loaded inside the groove 2b.
Therefore, when the lug-type pail can 10 is used for storing grease, the container body 1 is filled with grease, and then the groove 2b of the canopy 2 is fitted to the opening side end 1a of the container body 1 so that the canopy 2 Is attached, and the canopy 2 is fastened to the container body 1 by bending the pawl 4 along the curled curved surface of the opening end 1a. By this tightening, the gasket 3 is compressed, and the grease in the container body 1 is sealed in the pail can 10.

  As is generally recognized, the function of the gasket is to prevent gas and liquid from passing inside and outside the part where the gasket is mounted. 10, a gasket 3 that satisfies the above-described function is selected, and as an example, a gasket made of vinyl chloride is used. Therefore, conventionally, in the sealing test of the lug-type pail can 10 using a gasket made of vinyl chloride, even when water is put in the can and laid down and the internal pressure of the can is increased to 10 kPa, liquid leakage and gas A state where there is no leakage is achieved.

JIS Z 1620 (1995)

  On the other hand, in general, when filling a pail can with grease, the grease can be heated to about 85 ° C. because filling can be performed quickly by reducing the viscosity of the grease and increasing the fluidity. After the high temperature grease is filled in the pail can 10 as described above, the canopy 2 is attached to the container body 1 and sealed as described above.

  Therefore, the inside of the pail can 10 becomes negative pressure with respect to the outside air due to the shrinkage of the grease itself due to the temperature drop of the grease after filling and the shrinkage of the air inside the pail can accompanying the temperature drop. On the other hand, since the gasket 3 exhibits its function as described above, the pail can 10 is deformed due to the formation of the dent 6 in the container body 1 as shown in FIG. Such deformation of the container body 1 deteriorates the appearance, and is one of the events that is absolutely unacceptable for grease manufacturers in terms of quality control. On the other hand, this problem has become one of the concerns that must be taken by container makers.

  In order to solve this deformation problem, conventionally, in a grease filling pail can, a portion around the gasket 3 in the canopy 2 is slightly cut to form a ventilation portion in the gasket 3.

  By this ventilation part, the air permeability inside and outside of the grease filling pail can was secured, and the occurrence of the above-mentioned deformation could be solved. However, a new problem has arisen that it is possible to infiltrate moisture and insects that prefer the aroma of grease through the vent.

  On the other hand, as a method for preventing deformation of the grease filling pail can and preventing moisture and insects from entering, there is a method of increasing the thickness of the steel plate used for the container body. However, this method is not preferable because it increases the cost of the container and is a very simple method that does not make any corporate effort to solve the problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a grease container that does not deform the container while maintaining the inside and outside of the container.

In order to achieve the above object, the present invention is configured as follows.
That is, the grease container according to the first aspect of the present invention is a grease container in which a canopy with a gasket is detachably fastened to a container body containing heated grease,
The gasket is present over the entire circumference of the canopy, and is made of a urethane material mixed and foamed with two liquids. After molding, it has a structure in which closed cells and open cells are mixed. It is air permeable to negative pressure generated in the container body and liquid-tight to grease.

  The canopy has a groove fitted to the opening side end of the container body over the entire circumference of the inner surface of the canopy, and the gasket has an upper surface of the gasket 50 to 80% higher than the depth of the groove. You may comprise so that it may be located in.

  Further, the grease container may be a steel pail, and the canopy may be a lag type provided with a claw around the can.

  According to the grease container in the first aspect of the present invention, since the gasket provided on the canopy exists over the entire circumference of the canopy, the inside and outside of the container are blocked. Therefore, insects and moisture do not enter the container. Furthermore, since the gasket has a configuration in which closed cells and open cells are mixed, it has air permeability with respect to the negative pressure in the container and liquid-tightness with respect to grease. Therefore, even when the heated grease is filled and the temperature is lowered, the pressure drop in the container is suppressed, the container is not deformed, the liquid tightness is ensured, and the grease does not leak.

  By positioning the upper surface of the gasket at a height of 50% to 80% with respect to the depth of the groove of the canopy, the above-described air permeability and liquid tightness can be satisfied while suppressing the container manufacturing cost.

  By making the grease container into a lag type pail can, it is possible to easily form a grease container satisfying the above-described air permeability and liquid tightness by simply replacing the gasket of the conventional pail can. Moreover, since it is a lag type, a canopy can be easily clamped with respect to a container trunk | drum, and it can comprise at low cost compared with the band type prescribed | regulated to JISZ1620.

It is sectional drawing of the container in the gasket part with which the container for grease in embodiment of this invention is equipped. It is a graph which shows the property of the gasket shown in FIG. It is sectional drawing which shows schematic structure of the conventional gasket made from a vinyl chloride. It is sectional drawing which shows schematic structure of the gasket shown in FIG. It is a figure which shows the conventional pail can. It is a figure which shows the state which the dent generate | occur | produced in the conventional pail can.

The grease container according to the embodiment of the present invention will be described below with reference to the drawings. In each figure, the same or similar components are denoted by the same reference numerals.
In the following embodiment, the case where a lug type steel pail can is used is taken as an example of the grease container. The use of a pail can is preferable because a grease container can be formed simply by replacing the gasket of a conventional pail can. However, it may be a container having a gasket described in detail below, and is not limited to a pail can. Further, the present invention is not limited to the lug type, and can be applied to a container having a means for fastening the canopy and the container body, such as a band type.

  The grease container of the present embodiment is a lag type pail as defined in JIS Z 1620. The structure is the same as that described with reference to FIG. 4, and includes a container body 1 having a curled opening-side end 1 a and a canopy 2 having a pawl 4 and a groove 2 b, and the plate Both thicknesses are 0.34 mm. On the other hand, only the gasket provided in the groove 2b of the canopy 2 is different from that of the conventional pail can as described below. Therefore, only the gasket will be described below.

  In the following description, as shown in FIG. 1, the lug-type steel pail can according to this embodiment is denoted by reference numeral 110, and the gasket provided in the groove 2 b of the canopy 2 of the pail can 110 is denoted by reference numeral 101. Is attached.

  In short, the gasket 101 is a gasket that does not satisfy the above-mentioned generally recognized function as a gasket, that is, has a poor sealing performance against gas, in other words, corresponds to a gasket that cannot be conventionally used as a gasket. To do.

In other words, as shown by a dotted line in FIG. 2, in a generally recognized gasket, in order to increase the compression amount of the gasket and improve the sealing performance, the restoring force of the gasket by assembling increases substantially in a quadratic function. Have properties. That is, if it tightens strongly, sealing performance will improve according to it.
On the other hand, as shown by a solid line in FIG. 2, the gasket 101 has an invariable region 102 in which the restoring force of the gasket hardly changes even when the compression amount of the gasket is increased. That is, the gasket 101 has a property that the sealing performance is not so much improved although it is tightened. By utilizing this property, as will be described below, the gasket 101 allows gas to pass but does not allow liquid to pass, that is, has air permeability and liquid tightness.

  Such a gasket 101 is manufactured from the following materials. That is, as described above, the conventional gasket 3 is made of vinyl chloride, whereas the gasket 101 is made of a urethane material obtained by mixing and foaming two liquids. If it demonstrates in detail, the gasket 101 will mix the polyol mix which made urethane resin the main ingredient, and the hardening | curing agent. The polyol mix is a mixture of a polyol, water, and a catalyst, and the curing agent is a blowing agent isocyanate. Such a two-component mixed urethane foam material has the following characteristics as compared with a conventional vinyl chloride material.

  That is, the conventional vinyl chloride material of the gasket 3 has closed cells, and in the cross section, as shown in FIG. 3A, each bubble 31 is not connected and has an independent structure. This is a so-called closed cell structure. For this reason, the vinyl chloride material is accompanied by deformation in the transverse direction perpendicular to the compression direction at the time of compression, thereby having elasticity and resilience. Therefore, the vinyl chloride material is excellent as a material that satisfies a generally recognized function as a gasket.

  On the other hand, the two-component mixed urethane foam material of the gasket 101 has open cells in a part, and as shown in FIG. 3B, closed cells 101 a and open cells 101 b in which each closed cell 101 a is connected, so-called open. The cell has a mixed structure. Open cells do not undergo lateral deformation during compression. Therefore, the gasket 101 having a structure in which the closed cells 101a and the open cells 101b are mixed does not deform in the lateral direction at the initial stage of compression, but is accompanied by deformation in the lateral direction as the compression force increases. As a result, the gasket 101 has the above-described invariable region 102, air permeability, and liquid tightness.

  Such a gasket 101 is filled into the groove 2b of the canopy 2 in a liquid state in which two liquids are mixed, and then cured and formed. FIG. 1 shows the state after formation. When filling, the canopy 2 is reversed from the state shown in FIG. 1, and the liquid two-component mixed foamed urethane material is filled in the groove 2b. The Moreover, since the foaming agent is included as described above, the upper surface 101c of the gasket 101 has a raised arc shape.

Although the gasket 101 has the property of having air permeability and liquid-tightness based on the structure of the material itself as described above, the applicant has proposed that the gasket 101 be used to achieve such a property. It has been found that there is an appropriate filling amount into the groove 2b.
That is, as shown in FIG. 1, the distance from the bottom surface 2c of the groove 2b of the canopy 2 to the upper surface 101c of the gasket 101, in other words, the thickness T of the gasket 101 is the groove 2c from the bottom surface 2c to the inner surface 2a of the canopy 2. The depth D is preferably 50% to 80%. The gasket 101 having a thickness T in this range is a test method similar to the conventional case, when water is put into the container body 1 of the pail can 110 and laid sideways, and the inside of the pail can 110 is pressurized to 3 kPa or more. On the other hand, it was confirmed that air leaks through the gasket 101, that is, has air permeability, while water leakage was not confirmed. Note that no air leakage was observed at a pressure value of 2 kPa.

  When the thickness T is out of the above-mentioned appropriate range, that is, when it is less than 50%, liquid leakage occurs. When the thickness T exceeds 80%, airtightness occurs and gas cannot be leaked.

  As described above, there is an appropriate range for the thickness T of the gasket 101. From the viewpoint of manufacturing cost and margin, in the present embodiment, the thickness T, that is, the height from the bottom surface 2c of the groove 2b to the top surface 101c of the gasket 101 is used. Sets 60% of the depth D of the groove 2c as a target.

  As a method for confirming the breathability and liquid tightness of the gasket 101, a method was adopted in which water was laid sideways and the inside of the pail can was pressurized as described above. On the other hand, when the plate thickness of the container body 1 and the canopy 2 is 0.34 mm, the negative pressure causing the can deformation as described is about −10 kPa according to the vacuum test using an actual can. Therefore, it can be said that the value of 3 kPa, which is a pressure value used as the performance confirmation test method of the gasket 101, is a sufficiently reasonable and appropriate value for performing the performance confirmation test. Furthermore, in the confirmation test, water that leaks more easily than grease is used, and there is no problem in the confirmation test method of the gasket 101 from this point.

  Further, each of the pail cans 110 provided with the gasket 101 and the pail cans 10 using the conventional vinyl chloride gasket 3 are charged with 95 ° C. hot water and cooled to 5 ° C. Was subjected to a deformation confirmation test of each pail can. According to this test result, the pail can 110 of the present embodiment was not deformed due to reduced pressure, but the pail can 10 using the conventional gasket 3 made of vinyl chloride was greatly deformed. Also from this test result, it can be seen that the gasket 101 described above has ventilation performance.

  Furthermore, according to the actual usage method, a performance confirmation test method was performed in which the container body 1 of the pail can 110 was filled with heated grease, and the container body 1 was sealed with the canopy 2 provided with the gasket 101. It has been confirmed that there is no damage such as a dent in the can 110 and there is no grease leakage.

  As described above, in this embodiment, the case where the pail can 110 is used as the grease container is taken as an example, but the above-described appropriate range of the thickness T of the gasket 101 is not limited to the case of the pail can. In other words, in the case where a canopy having a groove is attached to the opening side end of the container body, the appropriate range is effective when the gasket 101 is provided in the groove.

  As described above, the canopy 2 provided with the gasket 101 having the ventilation performance and the liquid tightness performance is similar to the conventional case, after the heating grease is filled in the container body 1, the opening side end portion 1 a of the container body 1. The groove 2b of the canopy 2 is fitted to the cover 2 and is attached via the gasket 101. Further, the pawl 4 is bent and fastened to the container body 1. As described above, the gasket 101 has the invariable region 102 in which the restoring force of the gasket is hardly changed by the assembly, and the thickness T of the gasket 101 is set within the above-described appropriate range with respect to the depth D of the groove 2b. Therefore, when fastening the canopy 2 to the container body 1, it is not necessary to pay attention to the fastening force of the canopy 2. Therefore, by performing the conventional operation, the above-described performance with air permeability and liquid tightness is achieved in the gasket 101.

  Therefore, according to the pail can 110 in the present embodiment, after the heated grease is filled in the container body 1, the canopy 2 is attached to the container body 1 and tightened, and even when the grease temperature is lowered and cooled, Appearance damage such as a dent does not occur in the pail can 110. Furthermore, since the gasket 101 exists over the entire circumference of the canopy 2 and the gasket 101 has liquid-tight performance, moisture and insects do not enter the pail can 110, and the grease in the stored item is outside the can. There is no leakage.

  Further, since the pail can 110 is a lug type, the canopy 2 can be easily fastened to the container body 1 and can be configured at a lower cost than the band type defined in JIS Z 1620.

  Although the above description has been made in the case where grease is stored as a filling material in the container, the stored material is not limited to grease. That is, as is clear from the above description, the present invention is directed to a container for storing stored items that cause damage to the container by changing the inside of the container to a negative pressure after the container is sealed with a canopy. Obviously it is applicable.

  In the above description, a pail can is taken as an example of a container, and the container body is cylindrical. However, the outer shape of the container is not limited to a cylindrical shape, and may be a rectangular tube shape such as a square.

  The present invention can be applied to a container for storing grease, for example.

DESCRIPTION OF SYMBOLS 1 ... Container body, 1a ... Opening side edge part, 2 ... Canopy, 2b ... Groove,
101 ... gasket, 110 ... pail can.

Claims (4)

A container for grease in which a canopy (2) with a gasket (101) is detachably fastened to a container body (1) containing heated grease,
The grease container is a steel pail can,
The canopy has a groove (2b) fitted to the opening side end (1a) of the container body over the entire circumference of the inner surface of the canopy,
The gasket is present over the entire circumference of the canopy, and is made of a urethane material mixed and foamed with two liquids. The gasket is filled in the liquid state and molded, and after molding, closed cells and open cells are mixed. And has air permeability to the inside and outside of the container in a state where the canopy is fastened to the opening side end portion through the gasket against the negative pressure generated in the container body due to the temperature drop of the grease. And has liquid-tightness against grease,
A container for grease. Upper Symbol gasket, the gasket upper surface the depth of the groove (D) (101c) is located at 80% of the height from 50%, the grease vessel according to claim 1, wherein. Heaven lid, a lug type with an packed therearound, grease container according to claim 1 or 2. A method of closing a pail can by tightening and closing the canopy (2) on a container body (1) of a pail can containing heated grease,
The canopy has a groove (2b) fitted to the opening side end (1a) of the container body over the entire circumference of the inner surface of the canopy,
Filling the groove of the canopy with a foamed urethane material mixed with two liquids, and molding the urethane material gasket (101) in the groove, where the gasket exists over the entire circumference of the canopy And after molding, it has a structure in which closed cells and open cells are mixed,
After molding the gasket, after fitting the groove to the opening side end and closing the container body of the pail can with the canopy, tightening the canopy,
In this tightened state, the gasket has air permeability to the inside and outside of the pail can with respect to the negative pressure generated in the pail can body as the temperature of the grease drops, and is liquid-tight to the grease.
A pail can closing method characterized by that.

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