CA1329785C - Metal container and method of manufacturing the same - Google Patents
Metal container and method of manufacturing the sameInfo
- Publication number
- CA1329785C CA1329785C CA000596319A CA596319A CA1329785C CA 1329785 C CA1329785 C CA 1329785C CA 000596319 A CA000596319 A CA 000596319A CA 596319 A CA596319 A CA 596319A CA 1329785 C CA1329785 C CA 1329785C
- Authority
- CA
- Canada
- Prior art keywords
- adhesive
- bottom plate
- skirt portion
- cylinder
- cylinder means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D83/00—Containers or packages with special means for dispensing contents
- B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
- B65D83/38—Details of the container body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
- B21D51/30—Folding the circumferential seam
- B21D51/34—Folding the circumferential seam by pressing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
ABSTRACT
This invention relates to a metal container and a method of manufacturing the same, wherein the separate bottom plate is fitted to a cylinder body by the adhesive joint means, the adhesive being distributed in a constant manner over the effective joint surface in a convex style in contrast to the prior concave styler so that the joint section enjoys a satisfactory sealing and enough strong endurance against the extra internal pressure and the impact load. The convex form of the adhesive can be produced by inverting the assembled body and inserted bottom plate while effecting a curling step, or by addition of pressure to the interior of the body, or by heating the joint area, or by providing recesses in the plate to allow adhesive to flow into a curled end part of the body.
This invention relates to a metal container and a method of manufacturing the same, wherein the separate bottom plate is fitted to a cylinder body by the adhesive joint means, the adhesive being distributed in a constant manner over the effective joint surface in a convex style in contrast to the prior concave styler so that the joint section enjoys a satisfactory sealing and enough strong endurance against the extra internal pressure and the impact load. The convex form of the adhesive can be produced by inverting the assembled body and inserted bottom plate while effecting a curling step, or by addition of pressure to the interior of the body, or by heating the joint area, or by providing recesses in the plate to allow adhesive to flow into a curled end part of the body.
Description
--`` 132~78~
S E~E~ C I F ~C C A T I O N S
Title of the Invention Metal Container and Method of Manufacturing the same The Background of the Invention ; This invention relates to a metal container for the pressurized material and to a method of manufacturlng the same.
Metal containers, in other words, pressure holding containers have been largely used for aerosol containers and others, and there is still a large demand therefore in the various indiustrial fields.
~, A container of this type, in t:he prior art, was mainly formed by the step of drawing raw material into a cylinderical body with an integral bottom and processing -, also the top part to be smaller in diameter for the mouth by so-called necking procedures, whereon the top is closed by another member equipped with valve apparatus in the final stage of the completion.
The metal container complet~d through the above procedures in the prior art, however, i5 restricted in selecting the raw material, like aluminum, since it needs ductility and to be easily cast. Further, the completed container is not strong enough for the pressure endurance because of the nature of material itself.
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In order to obtain the better endurance of ~he pressure, U.S.PATENT No.4,241,~44 disclosed the following manufacturing method. First, draw the cylinderical body having at its one end the smaller diameter and having its othèr end opened, i.e.with no integral bottom at all, and with the same diameter as the cylinderical body, and then ~ fit a disc-like bottom plate produced by another step ln the ; open end by the adhesive joint means and caulking means.
This method accordingly allows the use of harder m~tallic material than aluminum, such as steel plate, and thus the cylinderical body is able to be made of steel plate as the sai~ body is produced by means of the step with open end.
After the bottom plate is inserted and furnished with adhesive in the bottom portion of the cylinder, the end part l of the said bottom portion interfolds the s~id bottom plate, ~;1 and the caulking is made, whereon the satisfactory pressure endurance is sustained.
With the above mentioned method, however, there i5 a problem in obtaining a good sealing in a satisfactory l~ condition. Inserted forcibly in the bottom portion of the 3 cylinderical bod~ furnished with adhesivet the bottom plate i~ causes the friction enga~ement in its skirt portion of the ~3~ ourter cir~umference with the inner wall of the cylinder, ;~ and this engagement sweeps the adhesive upwardly and finally the ~dhesive retains like a semilunar-like group just over ` the place between the inner wall and the shoulder of the bottom plate. After the insertion is finished, the similunar-like group of the adhesive exists all around in the inside. As above explainedr because of the friction effect, the adhesive does not almost exist correctly between , , .
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the whole outer circumference of the bottom plate and the inner wall of the cylinder, and thus the sealing is only kept by the said semilunar-like collective group of the adhesive. Thus, the effective surface of the adhesive which is to cover the whole outer circumference of the bottom plate with the inner wall becomes quite small, whereas the desirable and satisfactory sealing is not obtained.
The relative discloure indicates the use of strong adhesive of hardening type, and therefore when the adhesive comes to a collective group as mentioned aforsaid, the flexibility of the adhesive cannot be attained, and the said group is easily detached or broken against the pressure change caused by the inner forces or against the .,.!transformation of the bottom plate or that of the cylinder lower portion caused by the impact load, whereon the sealin~
is sometimes broken.
Therefore, it is the main object of this invention to resolve the problems as mentioned above.
The present invention has an object to provide a metal container ~nd a method of manufacturing the s~me with a satisfactory seal between the cylinder and the bottom plate.
~1It has a further object to provide a method of manufacturing a metal container which maintains the good seal by increasing the adhesive effective areas between the inner wall of the cylinder and the outer circumference of the bottom plate.
It is another object to provide a method of manufacturing a metal container with the improved seal by preventing the adhesive from becomin~ a semilunar-like collective group even if a hardening type of adhesive is used.
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It is a still further object to provide a method of manufacturing a metal container with an improved seal by retaining the adhesive in the required place in thP case of high-viscose adhesive usage~
It is yet another object to provide a method of ; manufacturing a metal container with a resistant seal on a joint point against a pressure change or against an impact load.
It is yet a still further object to provide a method of i manufacturing a metal container which can be produced on present exisiting e~uipment without any excessive capital investment.
It is a further object to provide a method of manufacturing a metal container with an improved seal by j adopting a method to form a piece or plural pieces of ditch on the skirt portion of the bottom plate, along the said ditch the adhesive runs upto the curling portion, whereafter !1' the adhesive is hardened to overlap on the whole gaps ;~ therewith.
Other objects and advantages of the present invention will be apparent upon reference to the accompanying descriptions.
Summary of the Invention , This invention relates to a metal container and a method of manufacturing the same, wherein the separate bottom plate is fitted in the cylinderical body by adhesive joint means, and it is characterized in increasing the effective areas j -4-, ' .:
-- 132~785 for adhesive between the inner wall of the cylinderical body and the outer wall of the bottom plate, improving the seal of the adhesive joint means by preventing the hardening ; adhesive from coming into a semilunar-like collective group, and precludin~ damages on the sealing part and deterioration of the sealing power caused by the pressure change or the impact load.
-~ If a high-viscose adhesive is utilized, it is adapted to make the relative adhesive coming in-to the whole gaps correctly 50 as to increase the sealing ability, whereas both damages and deterioration of the sealing joint part are prevented against the pressure change and the impact laod~
Furthermore, it is characteriæed in forming a piece or plural pieces of ditch on ~he skirt portion of the bottom plate, along the said ditch the adhesive runs through upto the curling portions whereafter the adhesive is hardened to overlap on the whole g~ps properly, which promotes the increase of the effective areas for the adhesive and also ;the sealing ~bility and also promotes the shock resistant powers caused by falling.
Brief descriptions of the drawings.
;FI~.1 and FIG.2 show a prior art metal container, FIG.1 being a cross-sectional view showing the container just before a bottom plate is fitted to a cylinderical body, while FIG.2 is a fragmentary cross-sectional view showing the arran~ement when the said plate is fitted to the body.
FIG.3 is a fragmentary cross-sectional view of a metal .
`` 132978~
container showing the position just before a bottom plate is fitted to a lower portion of the cylinderical body.
FIG.4 is a fragmentary cross-sectional view showiny the arrangement when the bottom plate is adhesively secured in the body.
FIG.5 and FIG.6 are cross-sectional views showing perspective curling steps.
FIG.7 is a perspective view showing the supply of adhesive.
FIG.8 is a cross-sectional view showing an alternative style of bottom plate.
FIG.9 is a plan view showing the step to provide a specimen for a stripping test.
FIG.10 is a perspective view of the said specimen.
~t FIG.11 and FIG.12 are schematic views for the relative testing method.
! FIG.13 and FIG.14 are a further embodiment, with FIG.13 being a cross-sectional view showing the working arrangement while FIG.14 is a fragmentary sectional view showing the adhesive joint part between the cylinderical body and ~he bottom plate.
FIG.15 to 17 show a still further embodimentl- with FIG.15 being a fragment~ry sectional view showing the working arrangement, while FIG.16 is a fragmentary sectional view showing the step of curling and FIG.17 is a fragmentary sectional view showing the arrangement when the bottom part is jointed with the cylinderical body.
FIG.18 and FIG.19 show a yet further embodiment, with FIG~18 being a perspective view of the bottom plater while FIG.19 is a fra~mentary sectional view showing the joint ' 132978~
between the cylinderical body and the bottom plate.
, Detailed descriptions of Preferred Embodiments .
The preferred embodiments are now explained in accordance with the drawings.
FIG.l and FIG.2 show the construction and manufacture of a prior art metal container. The present invention is substantially based on the said construction/ but it ~1 increases the adhesive effect between a cylinder11) and a l bottom plate(2) as well as improving the sealing ability thereof.
Referring to FIG.1 and FIG.Z, the cylinder(1) has its lowex end open and its other end drawn into a smaller . .
diameter top, where a dispensing means(24) such as a cap with an emitting valve is provided, the body between the ends being cylinderical. The bot:tom plate(Z) i5 inserted into the said open end of the cylinder(1) to form the lower closure of the cylinder(1), and it is in the form of a disc with a dome-like top portion(Z2) and a depending skirt portion(21~.
Adhesive(3) is applied between the fringe of the bottom plate and the inner wall of the cylinder~1) and the sealing joint part is formed between the two components. The lowest part of the cylinder(l) is subject to a curling operation and this folds over the skirt portion(21) of the bottom plate~2), whereon the skirt portion is pinched by the lowermost of the cylinder to produce resistance against movement of bottom plate(2) out of the cylinder(1) as a :
, 13297~
result of inner pressure.
In the prior art metal container, the adhesive applied between the cylinder(l) and the bottom plate~2~ tends to come a semilunar-like collective group between the shoulder of the bottom plate~2) and the inner wall of the cylinder(l) as a result of the frictional engagement of the bottom plate~2) with the inner cylinderical wall during the insertion procedure.
As above r when the adhesive comes together in a semilunar-]ike group, the flexibility or the elasticity of the adhesive is lost, and as a result of the internal pressure or the impact load breaks the adhesive effect and ,;
the sealing ability is lost, because both the cylinder and the bottom plate cannot withstand such internal pressure nor the impact load.
This invention aims to resolve these problems as mentioned above.
With reference to FIG.3 to FIG.13, the cylinder(l) and the bottom plate(Z) are the same as those of the prior art, and in the a & esive application step the adhesive is supplied ~ircumfrentially along the inner wall of the open end~11) of the cylinder~1). In this step, as shown in FIG.7, a nozzle(N) of an adhesive container is placed to a defined portion of the inner wall of the cylinder(l) and runs at 150 rpm.,for example, and the adhesive agent is, for example~
dispersed at 18 c.c. per minute, the adhesive(3) being applied circumferentially along the inner wall of the open end(11) as shown in FIG.3. The adhesive applied area must be the contacting area between the skirt portion(21) and the inner wall of the cylinder(l) when the bottom plate is ,.
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fitted in the cylinder~1).
The bottom plate~2) is inserted into the cylinder body furnished with adhesive from the open end ~11 ) r and as shown in FIG.4, the bottom end of the skirt portion(21) and the open end ~ of the cylinder~1) become axially aligned, i.e.,flush. In this situationr the adhesive~3) as shown in FIG.4 comes a semilunar-like group around the periphery of the dome-like portion~Z2) of the bottom plate~2).
The assembled body of the said cylinder(1~ and the said bottom plate(2) is then placed upside down, and subject to a curling procedure as shown in FIG~5 and FIG.6. The curling method is similar to the prior art method, and during the curling step, the bottom plate~Z~ is forcibly pushed inwardly into the cylinder(1) as the open end portion(11) is bent to interfold the bottom plate(2). After the said curling is finished the curling portion is formed circumferentially all around the bottom end of the skirt portion~21) as shown in FIG.6r and finally the said skirt portion~21) is pinched by the curling portions. After this curling procedure, until the adhesive~3) runs dry to be hardened, the condition of standing upside down must be maintained, during which the adhesive~3) runs along the surface of the cylinder inner wall and along the dome-like portion~2) by the liquidation of the adhesivel3). In order to obtain this natural flow of the adhesive~3~, it may be necessary only to keep this container standing upside down for stocking. By this procedure, the flow of the adhesive~3) is along the inner wall of the cylinder~1), and it is also along the slope toward the domed middle of the bottom plate, whereas the semilunar-like collective group of _g_ : . .: .; ,~. , . . .
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the adhesive(3~ which is the fatal defect of the prior art is completely cleared, and in this case, the semilunar-like group comes in convex style in stead of the previous concave style.
In the said embodiment, the following material are available for forming the cylinder(1) : Steel plate, Steel plate furnished with aluminum plating, aluminum sheet, cladding steel plate and compound steel plate furnished with plastics coating in its inside.
The following adhesive agents are available for the said embodiment : Epoxy solvent agent such as epoxy-amine type, or epoxy-urethane adhesive with high~viscose quality.
In this embodiment, the upper end of the skirt portion(Z1) can be provided with some taper, but this end can alternatively without any tc~per, as shown in FIG.~, having the hemispherical part(23), which is also easy and smooth to allow the said bottom plate(2) to be fitted into the cylinder~1).
The gap tolerance between the bottom end~11) of the cylinder and the skirt portion(21) is preferably between O.1 to 0.3 mm. In the case where the skirt portion is equipped with taper, as shown in FIG.4, some small circumferential gaps are formed, into which the adhesive(3) flows. In other words, at least~ on the upper part of the skirt portion, adhesi~e is accordingly provided.
The application of the adhesive~3) and the fittiny of the bottom plate~2) are made in compliance with the prior art.
With the invention, the cylinder(1) is kept as standing upside down, and the caulking is performed on the skirt portion(21). During the time when the caulking is performed , .
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and/or the maintenance time of keeping the above standing, the adhesive(3) runs down along the inner wall of the cylinder(1) from its semilunar-like group, and accordingly the said group of the adhesive(3) is gradually running lower and finally it changes its form into the convex style from its original concave style. Keeping this arrangement r the adhesive joint part is dryed and the resultant cylinder(1) is surely jointed around the hemisphere of the bottom plate(Z).
The adhesive is now applied over the circumferential edge part of the dome portion(22) and over the inner wall of the cylinder(1) in even thickness, as seen in the convex style between the bottom plate~Z) and the cylinder(1). Therefore, the adhesive applied areas can transform themselves in correspondence with the transEormation of the dome portion(ZZ) and the inner wall of the cylinder~1).
Even if the applied adhesive is fixed in qu~ntity, the effective surface for the adhesive is larger in comparison with the prior method in which the semilunar-like collective group is unavoidable.
As above explained, the adhesive applied are~s can tranform themselves accordingly by which the damage by pressure change or impact load is avoided and the satisfactory sealing is kept correct. At the same time, the increase of the effective areas for the adhesive also promotes the sealing ability when compared with the same produced by the prior art.
With regard to the present invention, a stripping test was performed and the relative data are now indicated and explained follows :
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~32~7~
The test container was of the following construction :
Diameter : 50mm Height : 1Z4mm i Thickness of the cylinderical body at the joint part:
O.Z7mm .-l Thickness of the bottom part at the joint part: 0.36mm ~.' Ma~erial : aluminum alloy ; Adhesive : Epoxy polyamide plastics adhesive 0.6 gram .~ used.
The test specimen was adopted, as shown in FIG.9, cuttin~
the piece down at 5mm wide at 120 degree interval, and the specimen was completed in the manner of FIG.10.
The testing was performed, as shown in FIG.11 and FIG.1Z, with the application of a pull gauge. Bottom side~25a) w~s stablized firmly and cylinder sid.e~25b) was connected with the pull gauge, whereon the operation of pulling was employed with readings of the pull gauge being taken.
The test result for 10 pieces is shown in the following "
table :
~:' ~: N mber_of_sReci_enla lb _ _lc Za _2b _ Zc_ ;; Stripping Power~K~12.9 1_3.5_13.4_ 13.4__l3.0 l3.5__ Specimen 3a 3b 3c4a_ 4b 4c 5a 5b _5c .~ Power _ 13.2 13.3 13.6 13.4 13.4 13.3 13.4 13.7 13.2 ., , -- Specimen 6a 6b 6c 7a 7b 7c ~a 8b 3c . .
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:
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~ Power lZ.7 13.6 13.4 13.1 13.4 12.7 13.5 13.3 14.0 , ~
Specimen 9a 9b_ 9c 10a __lOb _ lOc _ower 13.5 13.3 13.4____13.0 _13.5_ 13.6_ J
, ., At the same time, the same testing was performed for the container which was manufactured by the prior art in the semilunar collective group of adhesive, and the relative result is as below :
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Specimen Number 11a11b _ llc_ 12a _ 12b _12c ~ S ripping Power 3.5 .3.1 3.9 - .4.--?~ 4-4 3-8 ~' Specimen 13a 13b_ 13c 14a _14b 14c 15a _l_b _15c Power 4.1 2.9 4.1 4.5 3.4 3.6 3.3 4.5 4.1 : . _ .. ____ Specimen 16a_ 16b _l6c 17a 17b 17c l~a 18b 18c Pow~r _____3 4 3 5 3.Z 3.0 3.5__3 4 3.7 2.8 3.3 ~;"
Specimen l9a_ 19b_ 19c 20a _20b ?oc . Power 3.6 3.4 4.0 4.3 3.6 3.8 ~, . . . . . . . . _ _ _ . _ _ _ _ . . .. _ _ . .
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On checking the above data, the stripping power against the present invention shows 14.0 kgs at maximum and 12.7 kgs .,.~.
at minimum, and 13.34 kgs at average, while the same power against the pr.ior art shows 4.5 kgs at maxim~n and 2.8 kgs at minimum, and 3.66 kgs at average, all of which show that . !
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the strength of a container joint of this invention is ~pproximately 3.5 times that of the prior art.
The recommendable adhesive is epoxy typer non-solvent, two-part adhesive, and hardening type such as epoxy-amine aidhesive, epoxy-polyurethane adhesive and epox~-polyamide ~idhesive.
The adhesive used in the ~bove ~ield test is epoxy-poliamide type in the following consitutions ~
MAIN AGENT HARDENIN_ AGENT
EPOXY ~UANTITY 165~185 ~MINE VALUE - 400~440 VISCOSITY 5000~7000 CPS 4000~5000 CPS
P RCENTAGE_ __ _ _ 75 Qo _ 2 ~
, .
Now, with reference to FIG.13 and FIG.14, a modified embodiment is explained. In this modification, all elements between cylinder(1) ~nd the bottom plate(2) including their constitutions of the joint working and adhesive furnishing aire substantially same as explaiined in FIG.3 to FIG.8. The embodiment has its characteristic in providing extra pressure into the inner side of the container from the outside~
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132~7~5 By the extra power of pressure, the semilunar-like collective group of adhesive is now prevailing over the inner wall of the cylinder(1) and also over the dome portion~2~ of the bottom plate(2), and finally the semilunar-like group comes in the shape of convex by distribution of its adhesive.
After assembling the bottom plate(2) into the cylinder(1~, a pressure difference is established between the inside and the outside, in other words, high pressure is put into the inside. The applied adhesive is urethane type belonging to the epoxy-amine system. If the pressure increasing step is effected independently, the pressure condition applied cab be a few atomospheric pressures for a few seconds. The above condition depends upon the size of the gap between the cylinder(1) and the skirt portion(21) of the bottom pla~e(2) and also upon the viscosity of the applied adhesive. In a case where the gap is l~rger and viscosity is weaker, the pressuring time must be shortened ,;
accordingly, while if the gap is smaller and the viscosity is stronger the time must be increased.
As above mentioned, when the pressure is received in the interior, the semilunar-like collective group of the adhesive is forced to flow forcibly into the gap between the open end(11) and the skirt portion~21~, and the gap is ~ .,:
filled with the adhesive as the result. When the pressure is removed, the adhesive stays as it is in the gap.
The pressuring step is an independent step as above ; mentioned, but this relative step proceeds simaltaneously in correspondence wi-th the curling step.
The flow of the adhesive is now explained with the :':
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---` 1329~8~ i curling step as follows :
As shown in FI~.13 and FI~.14, during the curling step, the open end (11 ) of the cylinder(1) is bent to the inside for curlinq. The method of this curling is exactly the same as in the prior art, and during the curling step the adhesive has still not yet hardened as the bottom plate(2) is pushed into the inside of the cylinder(1). When the curling step is completed, the curling portions are formed around the bottom end of the skirt portion(21) as shown in FI~.14, and thus the said skirt portion(21) is pinched by the curling portions.
During the above steps, as shown in FIG.13, the inside of the cylinder(1) is receiving the fixed pressure, and the adhesive(3) is thus forced to flow into the gap between the cylinder~1) and the skirt portion(21). Under these conditions, the bottom plate(2) is pushed into the inside by the curling step. In compliance with the two factors that the bottom plate(2) is forcibly moved into the inside and that the continuous pressure is malintained, the adhesive(3~
is compelled to flow into the said gap even if the pressure time is quite short.
J As shown also in FIG.13, there is a pressure supply line from a pressure supply~P.S.~, and it is properly controlled in correspondence with the curling step. By this arrangement the fixed pressure in the inside of the cylinder is correctly kept and simultaneously the curling step is progressed, and thus the adhesive(3) forcibly flows into the gap between the cylinder(1) and the bottom plate(2).
In this embodiment, at the same time as the bottom plate(2) is pushed into the cylinder(1), the adhesive(3) is :- . .
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132978~
also pushed into the gap between the cylinder(1) and the skirt portion~21), whereas the semilunar-like collective group of the adh~sive on the upper part of the skirt portion(21) is gradually broken down to move into the gap.
In this embodiment, the following material is available for the cylinder : Steel plate, steel plate furnished with aluminum plating, aluminum sheet, thin cladding steel plate and compound steel plate furnished with plastics coating in its inside.
the applicable adhesive : Epoxy type, two-part adhesive such as epoxy-amine agent, epoxy-urethane agent and so on, with quality of strong viscosity.
After the step of puttin~ adhesive on the inner wall of the cylinder(1), the bottom plate(2) is inserted from the open end(113 oE the cylinder(1), and at this instant the adhesive(3) forms the semilunar-like group at the upper part of the skirt portion(Z1). Then the fixed pressure i5 pUt into the inside of the cylinder(1), and the semilunar-like group of the adhesive(3) is forced to flow into the said joint section. In other words, the gap is filled with the adhesive. According to the ~low of the adhesive~3) as .~
above, the semilunar-like group is gradually broken down into a formation of convex type, contrary to the semilunar-like form. Namely, the adhesive flows itself over along the inner wall of the cylinder~1~ and also over along the inclined surface of the skirt portion~22) into the average thickness, whereas the adhensive supplied areas arP easy to transform in accordance with the transformation of the wall or that of the skirt portion(21). The adhesive(3) in those areas stays as it is.
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In succession to the aforsaid pressuring step, the open end(11) is bent inwardly for curling the skirt portion(21) and finally the said portion is caulked, whereas the bottom plate(2~ is fixed in the lower portion of the cylinder(1).
Thereafter, the adhesive(3) is dryed and hardened to connect tightly the joint section between the cylinder(1) and the bottom plate~2).
Thus, the adhesive(3) flows forcibly into the gap between the cylinder(1) and the skirt portion(Z1), and the said gap is filled with the adhesive(3). Accordingly, the adhesive prevailed areas may transform by themselves in correspondence with the transformation of the inner surface of the skirt portion(21) and also with that of the cylinder inner wall, whereas the sealing joint se~tion is neither damaged by an intsrior pressure change insidedly or by an impact load nor the sealing ability is deteriorated.
Moreover, the contacting surf~ce between the inner wall of the cylinder(1) and the skirt portion(21) is larger in comparison with that of the prior art, and therefore the sealing ability is much greater.
During the simpl~ step of ~dding pressure to cause flow of adhesive, the adhesive itself does not change in quality.
, With refence to FIG.15 to 17, another modification of the invention is explained. The previous modification depended upon a pressure adding method, but the present modification is concerned with the extra heating.
According to FIG.15, the assembled body of the cylinder(1) and the bottom plate(2) is upright, whereon heating is temporarily employed upon the adhesive joint .
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section~ The applied adhesive is urethane type belonging to epoxy-amine system, and the heating condition is defined at 150 degree C for a few seconds. Heated, the semilunar-like group of the adhesive(3) at the upper part of thP skirt portion(21) gradually runs down into the gap between the open end(11) and the skirt portion(22) because the viscosity is weakened by the heating procedure, and finally the gap is filled with the adhesive(3). Immediately after the heating procedure i5 stoppedy the adhesive regains its original viscosit~v.
As a heating procedure, as shown in FIG.15, an infrared he~ter H is recommended, or else a high-frequency heater is also applicable.
As shown in FIG.16, the open end(11) is bent inwardly for the curling step. The curling st~p is the same step as for the prior art. In the curling step, the bottom plate(2) is pushed inwardly into the inside o~ the cylinder(1), and at the final stage of the relative curling step the curling portion is formed to surround the bottom end of the skirt portion(21), wherefore the skirt portion(21) is pinched by the relative curling portions.
The applicable adhesive is recomm~nded : Two-part adhesive of epoxy type such as epoxy-amine adhesive, epoxy-urethane adhesive with the quality of the strong viscosity.
In this modified embodiment, the heating procedure is expressed as an independent step, but this procedure may be included together with the insertion step of the bottom plate(2~. In a case where the above co-procedure is adopted, the semilunar-like collecting group of the adhesive comes very small.
'' ' ; , .''.: ' ' ~ ' -- 132978a After the adhesive(3) is furnished, where the bottom plate(Z~ is inserted from the open end (11 ) of the cylinder(1) the semilunar-like collective group of the adhesive(3) is formed at the upper part of the skirt portion(21). As the applied adhesive is of strong viscosity, enough volllme of the adhesive does not exist in the joint section between the cylinder(1) and the skirt portion(21).
Once the heating is applied on the said joint section to weaken its viscosity, the semilunar-like collective group of the adhesive(3) flows into the gap of the said joint section and the adhesive(3) fills the said gap. The semilunar-like group of the adhesive(3) gradually decreases its group unity to change into the convex style, and the average prevailing areas of the adhesive(3) adjus~ themselves to transform in correspondence with the transformation of the cylinder inside wall and with that of the skirt portion(~1). The adhesive(3) recovers its orlginal viscosity after the heating is stopped, and thus the adhesive(3) remains filling in the said joint section.
Then, the bottom plat~(2) is tightly fixed at the lower part of the cylinder(l) through the steps of the said ..... :
~. curling and caulking.
: ,, ~: When the adhesive is dryed and hardened, the satisfactory ` condition is obtained.
As explained above, the adhesive~3) stays in filling the said gap, whereas the group unity of the semilunar-like ! collective group of the adhesive(3) gradually decreases to change into the convex style and the average prevailing . areas of the adhesive~3) adjust themselves to transform in ~:.
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. . .
.' : ' ' :
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. , ,,,.~ 1 ` 132978~
accordance with the trans~ormation of the cylinder inside wall and with that of the skirt portion(21). It is also understood that the sealing joint section is neither damaged by an internal pressure change or by the impact load nor the saaling ability is deteriorated.
Moreover, the adhesive effecting areas between the inner wall of the cylinder~1) and the skirt portion~21) are larger in comparison with that of the prior art, and therefore the sealing ability is far greater.
This embodiment only requires the simple heater apparatus, which does not affect at all the mass production system both costly and systematically.
FIG.18 and FIG.19 refer a still further modification of the invention, which can be applied to any of the embodiments already described.
`~At the skirt portion(21) of the bottom plate(2~, a recess or a ditch(27) or plurality of recesses or ditches (2~ at the fixed interval therearound is established, so that the adhesive can flow into the curling portion(28) and it is dryed and hardened.
It i5 recommendable to establish three or four ditches in the size of 0.1~0.2mm deep and 0.1mm wide. The applicable ~;~adhesive(3) is two-part and non-solvent epoxy type with 2,500~4~000cp viscosity.
In order to flow the adhesive(3) into the curling portion(28) through the ditch, a 3-minutes heating operation at 150 degree C is employed or alternatively pressure at 0.5kg/cm2 for half a second is employed.
The adhesive(3) flows into the curling portion(28) through the ditch~27) and also it fills at the same time the ,,.
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gap between the inner wall of the cylinder(1) and the skirt portion(21). Accordingly, it is not necessary to prepare the slope at the upper part of the skirt portion(21) as shown in FIG.4. The gap tolerance between the cylinder~1) and tha skirt portion(21) may be fixed at 0, namely no tolerance is necessary.
According to this embodiment, the adhesive effective areas are increased and the airtightness therewith is also strengthened, wherefore the durability against a shock caused by the falling and so on is well maintained~
As the curling portion(28) filled with the adhesive becomes a rigid body completely with the integrity like pure , metal, a metal container with quite a good sealing is obtained.
For this embodiment, where the ~steel plate is adopted for the cylinder(1), the cut edge is completely covered with the s adhesive(3), which prevents the relative edge from becoming rusty, and, further, as the curllng portion(28) is filled with adhesive(3) ,it rejects ~ny incoming of water, and this s water-proof situation benefits the step of shrink packaging.The shrink film is likely to deform itself by absorbing the aqueous vapour caused by remaining water therewith. In general, the aerosol container receives the hot water test for leakage after refilling, ~nd during this test it is quite often that the air existing in the gap of the said curling portion~2B~ comes out to be mistaken as a leakage.
This embodiment definitely avoids such a mistake in the relative testing procedure.
..
, ~t
S E~E~ C I F ~C C A T I O N S
Title of the Invention Metal Container and Method of Manufacturing the same The Background of the Invention ; This invention relates to a metal container for the pressurized material and to a method of manufacturlng the same.
Metal containers, in other words, pressure holding containers have been largely used for aerosol containers and others, and there is still a large demand therefore in the various indiustrial fields.
~, A container of this type, in t:he prior art, was mainly formed by the step of drawing raw material into a cylinderical body with an integral bottom and processing -, also the top part to be smaller in diameter for the mouth by so-called necking procedures, whereon the top is closed by another member equipped with valve apparatus in the final stage of the completion.
The metal container complet~d through the above procedures in the prior art, however, i5 restricted in selecting the raw material, like aluminum, since it needs ductility and to be easily cast. Further, the completed container is not strong enough for the pressure endurance because of the nature of material itself.
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In order to obtain the better endurance of ~he pressure, U.S.PATENT No.4,241,~44 disclosed the following manufacturing method. First, draw the cylinderical body having at its one end the smaller diameter and having its othèr end opened, i.e.with no integral bottom at all, and with the same diameter as the cylinderical body, and then ~ fit a disc-like bottom plate produced by another step ln the ; open end by the adhesive joint means and caulking means.
This method accordingly allows the use of harder m~tallic material than aluminum, such as steel plate, and thus the cylinderical body is able to be made of steel plate as the sai~ body is produced by means of the step with open end.
After the bottom plate is inserted and furnished with adhesive in the bottom portion of the cylinder, the end part l of the said bottom portion interfolds the s~id bottom plate, ~;1 and the caulking is made, whereon the satisfactory pressure endurance is sustained.
With the above mentioned method, however, there i5 a problem in obtaining a good sealing in a satisfactory l~ condition. Inserted forcibly in the bottom portion of the 3 cylinderical bod~ furnished with adhesivet the bottom plate i~ causes the friction enga~ement in its skirt portion of the ~3~ ourter cir~umference with the inner wall of the cylinder, ;~ and this engagement sweeps the adhesive upwardly and finally the ~dhesive retains like a semilunar-like group just over ` the place between the inner wall and the shoulder of the bottom plate. After the insertion is finished, the similunar-like group of the adhesive exists all around in the inside. As above explainedr because of the friction effect, the adhesive does not almost exist correctly between , , .
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:
13297~
the whole outer circumference of the bottom plate and the inner wall of the cylinder, and thus the sealing is only kept by the said semilunar-like collective group of the adhesive. Thus, the effective surface of the adhesive which is to cover the whole outer circumference of the bottom plate with the inner wall becomes quite small, whereas the desirable and satisfactory sealing is not obtained.
The relative discloure indicates the use of strong adhesive of hardening type, and therefore when the adhesive comes to a collective group as mentioned aforsaid, the flexibility of the adhesive cannot be attained, and the said group is easily detached or broken against the pressure change caused by the inner forces or against the .,.!transformation of the bottom plate or that of the cylinder lower portion caused by the impact load, whereon the sealin~
is sometimes broken.
Therefore, it is the main object of this invention to resolve the problems as mentioned above.
The present invention has an object to provide a metal container ~nd a method of manufacturing the s~me with a satisfactory seal between the cylinder and the bottom plate.
~1It has a further object to provide a method of manufacturing a metal container which maintains the good seal by increasing the adhesive effective areas between the inner wall of the cylinder and the outer circumference of the bottom plate.
It is another object to provide a method of manufacturing a metal container with the improved seal by preventing the adhesive from becomin~ a semilunar-like collective group even if a hardening type of adhesive is used.
;: - , .
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, ' 13297~
It is a still further object to provide a method of manufacturing a metal container with an improved seal by retaining the adhesive in the required place in thP case of high-viscose adhesive usage~
It is yet another object to provide a method of ; manufacturing a metal container with a resistant seal on a joint point against a pressure change or against an impact load.
It is yet a still further object to provide a method of i manufacturing a metal container which can be produced on present exisiting e~uipment without any excessive capital investment.
It is a further object to provide a method of manufacturing a metal container with an improved seal by j adopting a method to form a piece or plural pieces of ditch on the skirt portion of the bottom plate, along the said ditch the adhesive runs upto the curling portion, whereafter !1' the adhesive is hardened to overlap on the whole gaps ;~ therewith.
Other objects and advantages of the present invention will be apparent upon reference to the accompanying descriptions.
Summary of the Invention , This invention relates to a metal container and a method of manufacturing the same, wherein the separate bottom plate is fitted in the cylinderical body by adhesive joint means, and it is characterized in increasing the effective areas j -4-, ' .:
-- 132~785 for adhesive between the inner wall of the cylinderical body and the outer wall of the bottom plate, improving the seal of the adhesive joint means by preventing the hardening ; adhesive from coming into a semilunar-like collective group, and precludin~ damages on the sealing part and deterioration of the sealing power caused by the pressure change or the impact load.
-~ If a high-viscose adhesive is utilized, it is adapted to make the relative adhesive coming in-to the whole gaps correctly 50 as to increase the sealing ability, whereas both damages and deterioration of the sealing joint part are prevented against the pressure change and the impact laod~
Furthermore, it is characteriæed in forming a piece or plural pieces of ditch on ~he skirt portion of the bottom plate, along the said ditch the adhesive runs through upto the curling portions whereafter the adhesive is hardened to overlap on the whole g~ps properly, which promotes the increase of the effective areas for the adhesive and also ;the sealing ~bility and also promotes the shock resistant powers caused by falling.
Brief descriptions of the drawings.
;FI~.1 and FIG.2 show a prior art metal container, FIG.1 being a cross-sectional view showing the container just before a bottom plate is fitted to a cylinderical body, while FIG.2 is a fragmentary cross-sectional view showing the arran~ement when the said plate is fitted to the body.
FIG.3 is a fragmentary cross-sectional view of a metal .
`` 132978~
container showing the position just before a bottom plate is fitted to a lower portion of the cylinderical body.
FIG.4 is a fragmentary cross-sectional view showiny the arrangement when the bottom plate is adhesively secured in the body.
FIG.5 and FIG.6 are cross-sectional views showing perspective curling steps.
FIG.7 is a perspective view showing the supply of adhesive.
FIG.8 is a cross-sectional view showing an alternative style of bottom plate.
FIG.9 is a plan view showing the step to provide a specimen for a stripping test.
FIG.10 is a perspective view of the said specimen.
~t FIG.11 and FIG.12 are schematic views for the relative testing method.
! FIG.13 and FIG.14 are a further embodiment, with FIG.13 being a cross-sectional view showing the working arrangement while FIG.14 is a fragmentary sectional view showing the adhesive joint part between the cylinderical body and ~he bottom plate.
FIG.15 to 17 show a still further embodimentl- with FIG.15 being a fragment~ry sectional view showing the working arrangement, while FIG.16 is a fragmentary sectional view showing the step of curling and FIG.17 is a fragmentary sectional view showing the arrangement when the bottom part is jointed with the cylinderical body.
FIG.18 and FIG.19 show a yet further embodiment, with FIG~18 being a perspective view of the bottom plater while FIG.19 is a fra~mentary sectional view showing the joint ' 132978~
between the cylinderical body and the bottom plate.
, Detailed descriptions of Preferred Embodiments .
The preferred embodiments are now explained in accordance with the drawings.
FIG.l and FIG.2 show the construction and manufacture of a prior art metal container. The present invention is substantially based on the said construction/ but it ~1 increases the adhesive effect between a cylinder11) and a l bottom plate(2) as well as improving the sealing ability thereof.
Referring to FIG.1 and FIG.Z, the cylinder(1) has its lowex end open and its other end drawn into a smaller . .
diameter top, where a dispensing means(24) such as a cap with an emitting valve is provided, the body between the ends being cylinderical. The bot:tom plate(Z) i5 inserted into the said open end of the cylinder(1) to form the lower closure of the cylinder(1), and it is in the form of a disc with a dome-like top portion(Z2) and a depending skirt portion(21~.
Adhesive(3) is applied between the fringe of the bottom plate and the inner wall of the cylinder~1) and the sealing joint part is formed between the two components. The lowest part of the cylinder(l) is subject to a curling operation and this folds over the skirt portion(21) of the bottom plate~2), whereon the skirt portion is pinched by the lowermost of the cylinder to produce resistance against movement of bottom plate(2) out of the cylinder(1) as a :
, 13297~
result of inner pressure.
In the prior art metal container, the adhesive applied between the cylinder(l) and the bottom plate~2~ tends to come a semilunar-like collective group between the shoulder of the bottom plate~2) and the inner wall of the cylinder(l) as a result of the frictional engagement of the bottom plate~2) with the inner cylinderical wall during the insertion procedure.
As above r when the adhesive comes together in a semilunar-]ike group, the flexibility or the elasticity of the adhesive is lost, and as a result of the internal pressure or the impact load breaks the adhesive effect and ,;
the sealing ability is lost, because both the cylinder and the bottom plate cannot withstand such internal pressure nor the impact load.
This invention aims to resolve these problems as mentioned above.
With reference to FIG.3 to FIG.13, the cylinder(l) and the bottom plate(Z) are the same as those of the prior art, and in the a & esive application step the adhesive is supplied ~ircumfrentially along the inner wall of the open end~11) of the cylinder~1). In this step, as shown in FIG.7, a nozzle(N) of an adhesive container is placed to a defined portion of the inner wall of the cylinder(l) and runs at 150 rpm.,for example, and the adhesive agent is, for example~
dispersed at 18 c.c. per minute, the adhesive(3) being applied circumferentially along the inner wall of the open end(11) as shown in FIG.3. The adhesive applied area must be the contacting area between the skirt portion(21) and the inner wall of the cylinder(l) when the bottom plate is ,.
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fitted in the cylinder~1).
The bottom plate~2) is inserted into the cylinder body furnished with adhesive from the open end ~11 ) r and as shown in FIG.4, the bottom end of the skirt portion(21) and the open end ~ of the cylinder~1) become axially aligned, i.e.,flush. In this situationr the adhesive~3) as shown in FIG.4 comes a semilunar-like group around the periphery of the dome-like portion~Z2) of the bottom plate~2).
The assembled body of the said cylinder(1~ and the said bottom plate(2) is then placed upside down, and subject to a curling procedure as shown in FIG~5 and FIG.6. The curling method is similar to the prior art method, and during the curling step, the bottom plate~Z~ is forcibly pushed inwardly into the cylinder(1) as the open end portion(11) is bent to interfold the bottom plate(2). After the said curling is finished the curling portion is formed circumferentially all around the bottom end of the skirt portion~21) as shown in FIG.6r and finally the said skirt portion~21) is pinched by the curling portions. After this curling procedure, until the adhesive~3) runs dry to be hardened, the condition of standing upside down must be maintained, during which the adhesive~3) runs along the surface of the cylinder inner wall and along the dome-like portion~2) by the liquidation of the adhesivel3). In order to obtain this natural flow of the adhesive~3~, it may be necessary only to keep this container standing upside down for stocking. By this procedure, the flow of the adhesive~3) is along the inner wall of the cylinder~1), and it is also along the slope toward the domed middle of the bottom plate, whereas the semilunar-like collective group of _g_ : . .: .; ,~. , . . .
`` ~3297~
the adhesive(3~ which is the fatal defect of the prior art is completely cleared, and in this case, the semilunar-like group comes in convex style in stead of the previous concave style.
In the said embodiment, the following material are available for forming the cylinder(1) : Steel plate, Steel plate furnished with aluminum plating, aluminum sheet, cladding steel plate and compound steel plate furnished with plastics coating in its inside.
The following adhesive agents are available for the said embodiment : Epoxy solvent agent such as epoxy-amine type, or epoxy-urethane adhesive with high~viscose quality.
In this embodiment, the upper end of the skirt portion(Z1) can be provided with some taper, but this end can alternatively without any tc~per, as shown in FIG.~, having the hemispherical part(23), which is also easy and smooth to allow the said bottom plate(2) to be fitted into the cylinder~1).
The gap tolerance between the bottom end~11) of the cylinder and the skirt portion(21) is preferably between O.1 to 0.3 mm. In the case where the skirt portion is equipped with taper, as shown in FIG.4, some small circumferential gaps are formed, into which the adhesive(3) flows. In other words, at least~ on the upper part of the skirt portion, adhesi~e is accordingly provided.
The application of the adhesive~3) and the fittiny of the bottom plate~2) are made in compliance with the prior art.
With the invention, the cylinder(1) is kept as standing upside down, and the caulking is performed on the skirt portion(21). During the time when the caulking is performed , .
:'.
.. , ,- . , . , , ~ ,.. . .
` ~3297~
and/or the maintenance time of keeping the above standing, the adhesive(3) runs down along the inner wall of the cylinder(1) from its semilunar-like group, and accordingly the said group of the adhesive(3) is gradually running lower and finally it changes its form into the convex style from its original concave style. Keeping this arrangement r the adhesive joint part is dryed and the resultant cylinder(1) is surely jointed around the hemisphere of the bottom plate(Z).
The adhesive is now applied over the circumferential edge part of the dome portion(22) and over the inner wall of the cylinder(1) in even thickness, as seen in the convex style between the bottom plate~Z) and the cylinder(1). Therefore, the adhesive applied areas can transform themselves in correspondence with the transEormation of the dome portion(ZZ) and the inner wall of the cylinder~1).
Even if the applied adhesive is fixed in qu~ntity, the effective surface for the adhesive is larger in comparison with the prior method in which the semilunar-like collective group is unavoidable.
As above explained, the adhesive applied are~s can tranform themselves accordingly by which the damage by pressure change or impact load is avoided and the satisfactory sealing is kept correct. At the same time, the increase of the effective areas for the adhesive also promotes the sealing ability when compared with the same produced by the prior art.
With regard to the present invention, a stripping test was performed and the relative data are now indicated and explained follows :
:
- . . . .
~32~7~
The test container was of the following construction :
Diameter : 50mm Height : 1Z4mm i Thickness of the cylinderical body at the joint part:
O.Z7mm .-l Thickness of the bottom part at the joint part: 0.36mm ~.' Ma~erial : aluminum alloy ; Adhesive : Epoxy polyamide plastics adhesive 0.6 gram .~ used.
The test specimen was adopted, as shown in FIG.9, cuttin~
the piece down at 5mm wide at 120 degree interval, and the specimen was completed in the manner of FIG.10.
The testing was performed, as shown in FIG.11 and FIG.1Z, with the application of a pull gauge. Bottom side~25a) w~s stablized firmly and cylinder sid.e~25b) was connected with the pull gauge, whereon the operation of pulling was employed with readings of the pull gauge being taken.
The test result for 10 pieces is shown in the following "
table :
~:' ~: N mber_of_sReci_enla lb _ _lc Za _2b _ Zc_ ;; Stripping Power~K~12.9 1_3.5_13.4_ 13.4__l3.0 l3.5__ Specimen 3a 3b 3c4a_ 4b 4c 5a 5b _5c .~ Power _ 13.2 13.3 13.6 13.4 13.4 13.3 13.4 13.7 13.2 ., , -- Specimen 6a 6b 6c 7a 7b 7c ~a 8b 3c . .
~ -12-. . ~ . : ' ... .
:
13297~
~ Power lZ.7 13.6 13.4 13.1 13.4 12.7 13.5 13.3 14.0 , ~
Specimen 9a 9b_ 9c 10a __lOb _ lOc _ower 13.5 13.3 13.4____13.0 _13.5_ 13.6_ J
, ., At the same time, the same testing was performed for the container which was manufactured by the prior art in the semilunar collective group of adhesive, and the relative result is as below :
:' :~:
Specimen Number 11a11b _ llc_ 12a _ 12b _12c ~ S ripping Power 3.5 .3.1 3.9 - .4.--?~ 4-4 3-8 ~' Specimen 13a 13b_ 13c 14a _14b 14c 15a _l_b _15c Power 4.1 2.9 4.1 4.5 3.4 3.6 3.3 4.5 4.1 : . _ .. ____ Specimen 16a_ 16b _l6c 17a 17b 17c l~a 18b 18c Pow~r _____3 4 3 5 3.Z 3.0 3.5__3 4 3.7 2.8 3.3 ~;"
Specimen l9a_ 19b_ 19c 20a _20b ?oc . Power 3.6 3.4 4.0 4.3 3.6 3.8 ~, . . . . . . . . _ _ _ . _ _ _ _ . . .. _ _ . .
. ..
. ~
On checking the above data, the stripping power against the present invention shows 14.0 kgs at maximum and 12.7 kgs .,.~.
at minimum, and 13.34 kgs at average, while the same power against the pr.ior art shows 4.5 kgs at maxim~n and 2.8 kgs at minimum, and 3.66 kgs at average, all of which show that . !
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the strength of a container joint of this invention is ~pproximately 3.5 times that of the prior art.
The recommendable adhesive is epoxy typer non-solvent, two-part adhesive, and hardening type such as epoxy-amine aidhesive, epoxy-polyurethane adhesive and epox~-polyamide ~idhesive.
The adhesive used in the ~bove ~ield test is epoxy-poliamide type in the following consitutions ~
MAIN AGENT HARDENIN_ AGENT
EPOXY ~UANTITY 165~185 ~MINE VALUE - 400~440 VISCOSITY 5000~7000 CPS 4000~5000 CPS
P RCENTAGE_ __ _ _ 75 Qo _ 2 ~
, .
Now, with reference to FIG.13 and FIG.14, a modified embodiment is explained. In this modification, all elements between cylinder(1) ~nd the bottom plate(2) including their constitutions of the joint working and adhesive furnishing aire substantially same as explaiined in FIG.3 to FIG.8. The embodiment has its characteristic in providing extra pressure into the inner side of the container from the outside~
~ 'i ` . ` ' ' . :
132~7~5 By the extra power of pressure, the semilunar-like collective group of adhesive is now prevailing over the inner wall of the cylinder(1) and also over the dome portion~2~ of the bottom plate(2), and finally the semilunar-like group comes in the shape of convex by distribution of its adhesive.
After assembling the bottom plate(2) into the cylinder(1~, a pressure difference is established between the inside and the outside, in other words, high pressure is put into the inside. The applied adhesive is urethane type belonging to the epoxy-amine system. If the pressure increasing step is effected independently, the pressure condition applied cab be a few atomospheric pressures for a few seconds. The above condition depends upon the size of the gap between the cylinder(1) and the skirt portion(21) of the bottom pla~e(2) and also upon the viscosity of the applied adhesive. In a case where the gap is l~rger and viscosity is weaker, the pressuring time must be shortened ,;
accordingly, while if the gap is smaller and the viscosity is stronger the time must be increased.
As above mentioned, when the pressure is received in the interior, the semilunar-like collective group of the adhesive is forced to flow forcibly into the gap between the open end(11) and the skirt portion~21~, and the gap is ~ .,:
filled with the adhesive as the result. When the pressure is removed, the adhesive stays as it is in the gap.
The pressuring step is an independent step as above ; mentioned, but this relative step proceeds simaltaneously in correspondence wi-th the curling step.
The flow of the adhesive is now explained with the :':
.
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---` 1329~8~ i curling step as follows :
As shown in FI~.13 and FI~.14, during the curling step, the open end (11 ) of the cylinder(1) is bent to the inside for curlinq. The method of this curling is exactly the same as in the prior art, and during the curling step the adhesive has still not yet hardened as the bottom plate(2) is pushed into the inside of the cylinder(1). When the curling step is completed, the curling portions are formed around the bottom end of the skirt portion(21) as shown in FI~.14, and thus the said skirt portion(21) is pinched by the curling portions.
During the above steps, as shown in FIG.13, the inside of the cylinder(1) is receiving the fixed pressure, and the adhesive(3) is thus forced to flow into the gap between the cylinder~1) and the skirt portion(21). Under these conditions, the bottom plate(2) is pushed into the inside by the curling step. In compliance with the two factors that the bottom plate(2) is forcibly moved into the inside and that the continuous pressure is malintained, the adhesive(3~
is compelled to flow into the said gap even if the pressure time is quite short.
J As shown also in FIG.13, there is a pressure supply line from a pressure supply~P.S.~, and it is properly controlled in correspondence with the curling step. By this arrangement the fixed pressure in the inside of the cylinder is correctly kept and simultaneously the curling step is progressed, and thus the adhesive(3) forcibly flows into the gap between the cylinder(1) and the bottom plate(2).
In this embodiment, at the same time as the bottom plate(2) is pushed into the cylinder(1), the adhesive(3) is :- . .
: ~ ,......... .. .
.. . . ...................... . .
132978~
also pushed into the gap between the cylinder(1) and the skirt portion~21), whereas the semilunar-like collective group of the adh~sive on the upper part of the skirt portion(21) is gradually broken down to move into the gap.
In this embodiment, the following material is available for the cylinder : Steel plate, steel plate furnished with aluminum plating, aluminum sheet, thin cladding steel plate and compound steel plate furnished with plastics coating in its inside.
the applicable adhesive : Epoxy type, two-part adhesive such as epoxy-amine agent, epoxy-urethane agent and so on, with quality of strong viscosity.
After the step of puttin~ adhesive on the inner wall of the cylinder(1), the bottom plate(2) is inserted from the open end(113 oE the cylinder(1), and at this instant the adhesive(3) forms the semilunar-like group at the upper part of the skirt portion(Z1). Then the fixed pressure i5 pUt into the inside of the cylinder(1), and the semilunar-like group of the adhesive(3) is forced to flow into the said joint section. In other words, the gap is filled with the adhesive. According to the ~low of the adhesive~3) as .~
above, the semilunar-like group is gradually broken down into a formation of convex type, contrary to the semilunar-like form. Namely, the adhesive flows itself over along the inner wall of the cylinder~1~ and also over along the inclined surface of the skirt portion~22) into the average thickness, whereas the adhensive supplied areas arP easy to transform in accordance with the transformation of the wall or that of the skirt portion(21). The adhesive(3) in those areas stays as it is.
., ;
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In succession to the aforsaid pressuring step, the open end(11) is bent inwardly for curling the skirt portion(21) and finally the said portion is caulked, whereas the bottom plate(2~ is fixed in the lower portion of the cylinder(1).
Thereafter, the adhesive(3) is dryed and hardened to connect tightly the joint section between the cylinder(1) and the bottom plate~2).
Thus, the adhesive(3) flows forcibly into the gap between the cylinder(1) and the skirt portion(Z1), and the said gap is filled with the adhesive(3). Accordingly, the adhesive prevailed areas may transform by themselves in correspondence with the transformation of the inner surface of the skirt portion(21) and also with that of the cylinder inner wall, whereas the sealing joint se~tion is neither damaged by an intsrior pressure change insidedly or by an impact load nor the sealing ability is deteriorated.
Moreover, the contacting surf~ce between the inner wall of the cylinder(1) and the skirt portion(21) is larger in comparison with that of the prior art, and therefore the sealing ability is much greater.
During the simpl~ step of ~dding pressure to cause flow of adhesive, the adhesive itself does not change in quality.
, With refence to FIG.15 to 17, another modification of the invention is explained. The previous modification depended upon a pressure adding method, but the present modification is concerned with the extra heating.
According to FIG.15, the assembled body of the cylinder(1) and the bottom plate(2) is upright, whereon heating is temporarily employed upon the adhesive joint .
:'` , :. ,.
" ~ '' '' ., '.. ~. , ;, 32978~
section~ The applied adhesive is urethane type belonging to epoxy-amine system, and the heating condition is defined at 150 degree C for a few seconds. Heated, the semilunar-like group of the adhesive(3) at the upper part of thP skirt portion(21) gradually runs down into the gap between the open end(11) and the skirt portion(22) because the viscosity is weakened by the heating procedure, and finally the gap is filled with the adhesive(3). Immediately after the heating procedure i5 stoppedy the adhesive regains its original viscosit~v.
As a heating procedure, as shown in FIG.15, an infrared he~ter H is recommended, or else a high-frequency heater is also applicable.
As shown in FIG.16, the open end(11) is bent inwardly for the curling step. The curling st~p is the same step as for the prior art. In the curling step, the bottom plate(2) is pushed inwardly into the inside o~ the cylinder(1), and at the final stage of the relative curling step the curling portion is formed to surround the bottom end of the skirt portion(21), wherefore the skirt portion(21) is pinched by the relative curling portions.
The applicable adhesive is recomm~nded : Two-part adhesive of epoxy type such as epoxy-amine adhesive, epoxy-urethane adhesive with the quality of the strong viscosity.
In this modified embodiment, the heating procedure is expressed as an independent step, but this procedure may be included together with the insertion step of the bottom plate(2~. In a case where the above co-procedure is adopted, the semilunar-like collecting group of the adhesive comes very small.
'' ' ; , .''.: ' ' ~ ' -- 132978a After the adhesive(3) is furnished, where the bottom plate(Z~ is inserted from the open end (11 ) of the cylinder(1) the semilunar-like collective group of the adhesive(3) is formed at the upper part of the skirt portion(21). As the applied adhesive is of strong viscosity, enough volllme of the adhesive does not exist in the joint section between the cylinder(1) and the skirt portion(21).
Once the heating is applied on the said joint section to weaken its viscosity, the semilunar-like collective group of the adhesive(3) flows into the gap of the said joint section and the adhesive(3) fills the said gap. The semilunar-like group of the adhesive(3) gradually decreases its group unity to change into the convex style, and the average prevailing areas of the adhesive(3) adjus~ themselves to transform in correspondence with the transformation of the cylinder inside wall and with that of the skirt portion(~1). The adhesive(3) recovers its orlginal viscosity after the heating is stopped, and thus the adhesive(3) remains filling in the said joint section.
Then, the bottom plat~(2) is tightly fixed at the lower part of the cylinder(l) through the steps of the said ..... :
~. curling and caulking.
: ,, ~: When the adhesive is dryed and hardened, the satisfactory ` condition is obtained.
As explained above, the adhesive~3) stays in filling the said gap, whereas the group unity of the semilunar-like ! collective group of the adhesive(3) gradually decreases to change into the convex style and the average prevailing . areas of the adhesive~3) adjust themselves to transform in ~:.
.,, ... ~20~-,:..
. . .
.' : ' ' :
~:' . - .
. , ,,,.~ 1 ` 132978~
accordance with the trans~ormation of the cylinder inside wall and with that of the skirt portion(21). It is also understood that the sealing joint section is neither damaged by an internal pressure change or by the impact load nor the saaling ability is deteriorated.
Moreover, the adhesive effecting areas between the inner wall of the cylinder~1) and the skirt portion~21) are larger in comparison with that of the prior art, and therefore the sealing ability is far greater.
This embodiment only requires the simple heater apparatus, which does not affect at all the mass production system both costly and systematically.
FIG.18 and FIG.19 refer a still further modification of the invention, which can be applied to any of the embodiments already described.
`~At the skirt portion(21) of the bottom plate(2~, a recess or a ditch(27) or plurality of recesses or ditches (2~ at the fixed interval therearound is established, so that the adhesive can flow into the curling portion(28) and it is dryed and hardened.
It i5 recommendable to establish three or four ditches in the size of 0.1~0.2mm deep and 0.1mm wide. The applicable ~;~adhesive(3) is two-part and non-solvent epoxy type with 2,500~4~000cp viscosity.
In order to flow the adhesive(3) into the curling portion(28) through the ditch, a 3-minutes heating operation at 150 degree C is employed or alternatively pressure at 0.5kg/cm2 for half a second is employed.
The adhesive(3) flows into the curling portion(28) through the ditch~27) and also it fills at the same time the ,,.
' ,, , ,, - .. ~ .
: .. . . . . .
, ,, .. ". : ,, , , :
- . ', ., ,. ,'', . '' : , :''.,. :;' 132978~
gap between the inner wall of the cylinder(1) and the skirt portion(21). Accordingly, it is not necessary to prepare the slope at the upper part of the skirt portion(21) as shown in FIG.4. The gap tolerance between the cylinder~1) and tha skirt portion(21) may be fixed at 0, namely no tolerance is necessary.
According to this embodiment, the adhesive effective areas are increased and the airtightness therewith is also strengthened, wherefore the durability against a shock caused by the falling and so on is well maintained~
As the curling portion(28) filled with the adhesive becomes a rigid body completely with the integrity like pure , metal, a metal container with quite a good sealing is obtained.
For this embodiment, where the ~steel plate is adopted for the cylinder(1), the cut edge is completely covered with the s adhesive(3), which prevents the relative edge from becoming rusty, and, further, as the curllng portion(28) is filled with adhesive(3) ,it rejects ~ny incoming of water, and this s water-proof situation benefits the step of shrink packaging.The shrink film is likely to deform itself by absorbing the aqueous vapour caused by remaining water therewith. In general, the aerosol container receives the hot water test for leakage after refilling, ~nd during this test it is quite often that the air existing in the gap of the said curling portion~2B~ comes out to be mistaken as a leakage.
This embodiment definitely avoids such a mistake in the relative testing procedure.
..
, ~t
Claims (19)
1. A metal container comprising:
a cylinder means adapted to be the main body of a container, the cylinder means having an open end;
a bottom plate means having a dome-like top disc and a skirt portion, the skirt portion having its outer surface parallel or nearly in parallel with an inner surface of the cylinder means;
a hardening adhesive securing said bottom plate means to said cylinder means; and a curling portion formed at said open end of the cylinder means so as tightly to attach the skirt portion of the bottom plate means to the cylinder means;
characterized by gap means between said inner surface of the cylinder means and the outer surface of the skirt portion, and by said adhesive being effective in said gap means, and also along said inner surface of the cylinder means and said bottom plate means outside of said gap means.
a cylinder means adapted to be the main body of a container, the cylinder means having an open end;
a bottom plate means having a dome-like top disc and a skirt portion, the skirt portion having its outer surface parallel or nearly in parallel with an inner surface of the cylinder means;
a hardening adhesive securing said bottom plate means to said cylinder means; and a curling portion formed at said open end of the cylinder means so as tightly to attach the skirt portion of the bottom plate means to the cylinder means;
characterized by gap means between said inner surface of the cylinder means and the outer surface of the skirt portion, and by said adhesive being effective in said gap means, and also along said inner surface of the cylinder means and said bottom plate means outside of said gap means.
2. A metal container according to claim 1, characterized by the skirt portion having a tapering outer surface formed on an upper part thereof extending from said top disc, said gap means being defined between said outer tapering surface and said inner surface of the cylinder means.
3. A metal container according to claim 1 or 2, characterized by at least one recess being formed at the skirt portion, said adhesive in said gap means extending to said curling portion through said at least one recess.
4. A metal container according to claim 1, characterized by the adhesive having the nature of a non-solvent, two-part epoxy type.
5. A metal container according to claim 4, characterized by the adhesive having the nature of an epoxy-amine type.
6. A metal container according to claim 4, characterized by the adhesive having the nature of an epoxy-polyamide type.
7. A metal container according to claim 4, characterized by the adhesive having the nature of an epoxy-urethane type.
8. A metal container comprising:
a cylindrical body having an open bottom;
a bottom plate having a dome-like top disc portion and a cylindrical skirt portion with its outer wall nearly in parallel with the bottom of said cylindrical body;
a joint to connect the said bottom plate with the cylindrical body;
a curling portion formed in the bottom of the cylindrical body so as to couple the skirt portion of the bottom plate to the cylindrical body;
the joint being a high viscosity reaction type, two-part hardenable adhesive applied unhardened along both an inner wall of the cylindrical body and contacting an inner surface of the skirt portion of the bottom plate when the bottom plate is inserted in the open bottom of the cylindrical body and being flowable to a convex, inner surface of the dome-like top disc portion of the bottom plate prior to hardening, wherein the joint adhesive is a non-solvent epoxy type adhesive.
a cylindrical body having an open bottom;
a bottom plate having a dome-like top disc portion and a cylindrical skirt portion with its outer wall nearly in parallel with the bottom of said cylindrical body;
a joint to connect the said bottom plate with the cylindrical body;
a curling portion formed in the bottom of the cylindrical body so as to couple the skirt portion of the bottom plate to the cylindrical body;
the joint being a high viscosity reaction type, two-part hardenable adhesive applied unhardened along both an inner wall of the cylindrical body and contacting an inner surface of the skirt portion of the bottom plate when the bottom plate is inserted in the open bottom of the cylindrical body and being flowable to a convex, inner surface of the dome-like top disc portion of the bottom plate prior to hardening, wherein the joint adhesive is a non-solvent epoxy type adhesive.
9. A method of manufacturing a metal container comprising the steps of:
providing a cylinder means adapted to be the main body of the container, the cylinder means having an open end;
providing a bottom plate means having a dome-like top disc and a skirt portion, the skirt portion having its outer surface parallel or nearly in parallel with an inner surface of the cylinder means;
applying a hardening adhesive circum-ferentially to said inner surface of the cylinder means in the vicinity of its open end;
inserting the bottom plate means into the cylinder means through the open end thereof; and curling said open end of the cylinder means towards the inside after the bottom plate means has been inserted into the cylinder means, to attach the skirt portion thereto;
characterized by a step in which the adhesive on the inner surface of the cylinder means flows into gap means defined between said inner surface of the cylinder means and the outer surface of the skirt portion, and also along said inner surface of the cylinder means and said bottom plate means outside of said gap means, effectively to secure the bottom plate means to the cylinder means.
providing a cylinder means adapted to be the main body of the container, the cylinder means having an open end;
providing a bottom plate means having a dome-like top disc and a skirt portion, the skirt portion having its outer surface parallel or nearly in parallel with an inner surface of the cylinder means;
applying a hardening adhesive circum-ferentially to said inner surface of the cylinder means in the vicinity of its open end;
inserting the bottom plate means into the cylinder means through the open end thereof; and curling said open end of the cylinder means towards the inside after the bottom plate means has been inserted into the cylinder means, to attach the skirt portion thereto;
characterized by a step in which the adhesive on the inner surface of the cylinder means flows into gap means defined between said inner surface of the cylinder means and the outer surface of the skirt portion, and also along said inner surface of the cylinder means and said bottom plate means outside of said gap means, effectively to secure the bottom plate means to the cylinder means.
10. A method according to claim 9, characterized by a step in which the assembled body of the cylinder means and the bottom plate means is set upside down and maintained in this position for some interval, by which the adhesive flows, outside of said gap means, along the inner surface of the cylinder means and along said bottom plate means.
11. A method according to claim 9, characterized by a step in which extra pressure is applied to the adhesive before it hardens, by which the adhesive flows, outside of said gap means, along the inner surface of the cylinder means and along said bottom plate means.
12. A method according to claim 9, characterized by a step in which heat is applied to the adhesive, by which the adhesive flows, outside of said gap means, along the inner surface of the cylinder means and along said bottom plate means.
13. A method according to any one of claims 9, 10, 11 or 12, characterized by a step in which the adhesive flows into at least one recess at the skirt portion, the adhesive flowing to fill said curled part of the cylinder means through the said recess.
14. A method according to any one of claims 9, 10, 11 or 12, characterized by a step in which the adhesive flows into said gap means defined between an outer tapering surface on an upper part of the skirt portion extending from said top disc, and said inner surface of the cylinder means.
15. A method according to any one of claims 9, 10, 11 or 12, characterized by using adhesive with the nature of a non-solvent, two-part, epoxy type.
16. A method according to any one of claims 9, 10, 11 or 12, characterized by using adhesive with the nature of an epoxy-amine type.
17. A method according to any one of claims 9, 10, 11 or 12, characterized by using adhesive with the nature of an epoxy polyamide type.
18. A method according to any one of claims 9, 10, 11 or 12, characterized by using adhesive with the nature of an epoxy-urethane type.
19. A method of manufacturing a metal container comprising:
applying a high viscosity, reaction type two-part joint circumferentially in an inner wall in the vicinity of an open end of a cylindrical body forming the main body of a container;
inserting a bottom plate having a dome-like top disc portion and a skirt portion with its outer wall nearly in parallel with an inner wall of the cylindrical body into the open end of the cylindrical body;
caulking the skirt portion of the bottom plate by curling the open end inwardly after the bottom plate is inserted into the cylindrical body; and transferring the joint along to the inner wall of the cylindrical body and to the surface of the bottom plate and to the said joint means a convex surface of the bottom plate during or after the caulking step.
applying a high viscosity, reaction type two-part joint circumferentially in an inner wall in the vicinity of an open end of a cylindrical body forming the main body of a container;
inserting a bottom plate having a dome-like top disc portion and a skirt portion with its outer wall nearly in parallel with an inner wall of the cylindrical body into the open end of the cylindrical body;
caulking the skirt portion of the bottom plate by curling the open end inwardly after the bottom plate is inserted into the cylindrical body; and transferring the joint along to the inner wall of the cylindrical body and to the surface of the bottom plate and to the said joint means a convex surface of the bottom plate during or after the caulking step.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62300490A JPH0734947B2 (en) | 1987-11-27 | 1987-11-27 | Pressure vessel and manufacturing method thereof |
| JP62331758A JPH0677781B2 (en) | 1987-12-26 | 1987-12-26 | Pressure vessel manufacturing method |
| JP62331757A JPH0667525B2 (en) | 1987-12-26 | 1987-12-26 | Pressure vessel manufacturing method |
| EP88311231A EP0318327B1 (en) | 1987-11-27 | 1988-11-28 | Metal container and method of manufacturing the same |
| DE88311231T DE3884762T2 (en) | 1987-11-27 | 1988-11-28 | Metallic container and process for its manufacture. |
| CA000596319A CA1329785C (en) | 1987-11-27 | 1989-04-11 | Metal container and method of manufacturing the same |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62300490A JPH0734947B2 (en) | 1987-11-27 | 1987-11-27 | Pressure vessel and manufacturing method thereof |
| JP62331758A JPH0677781B2 (en) | 1987-12-26 | 1987-12-26 | Pressure vessel manufacturing method |
| JP62331757A JPH0667525B2 (en) | 1987-12-26 | 1987-12-26 | Pressure vessel manufacturing method |
| CA000596319A CA1329785C (en) | 1987-11-27 | 1989-04-11 | Metal container and method of manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1329785C true CA1329785C (en) | 1994-05-24 |
Family
ID=27426654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000596319A Expired - Fee Related CA1329785C (en) | 1987-11-27 | 1989-04-11 | Metal container and method of manufacturing the same |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0318327B1 (en) |
| CA (1) | CA1329785C (en) |
| DE (1) | DE3884762T2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10257009A1 (en) * | 2002-12-06 | 2004-06-17 | Continental Aktiengesellschaft | Air spring cover with extra volume and method for its production |
| EP1889673A1 (en) * | 2006-08-17 | 2008-02-20 | Corus Staal BV | Method for manufacturing a metal container |
| CN111283112B (en) * | 2020-03-09 | 2021-07-09 | 山东金谷信息技术有限公司 | Gas steel cylinder bottom filling production line |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH564166A5 (en) * | 1973-03-08 | 1975-07-15 | Alusuisse | |
| EP0260084B1 (en) * | 1986-09-08 | 1992-12-30 | Asia Can Company Limited | Metal container and method of manufacturing the same |
-
1988
- 1988-11-28 DE DE88311231T patent/DE3884762T2/en not_active Expired - Fee Related
- 1988-11-28 EP EP88311231A patent/EP0318327B1/en not_active Expired - Lifetime
-
1989
- 1989-04-11 CA CA000596319A patent/CA1329785C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0318327A3 (en) | 1990-01-24 |
| EP0318327A2 (en) | 1989-05-31 |
| DE3884762D1 (en) | 1993-11-11 |
| EP0318327B1 (en) | 1993-10-06 |
| DE3884762T2 (en) | 1994-02-10 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |