JP2000191006A - Screwed can, manufacture thereof and capped container employing screwed can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a screwed can which is harmless to hand without allowing fingers or the like to be damaged even though being in touch therewith by a method wherein a curled part being thinner in the thickness than a screwed part is provided at the upper end of a neck part of a can made of metal sheet wherein a screwed part made up by indented and projected deformation is provided at the neck part. SOLUTION: The upper part of a can formed in a bottomed cylindrical shape out of a circular metal sheet blank by deep drawing is formed into two parts of a shoulder 2 and a neck 3 by necking, and a screwed part 4 in a corrugated shape section is formed by roll forming. Then, drawing is applied further to a mouth-top part 3c, and a small-diameter part 3b is formed with its outer circumference thinned in the thickness by cutting. Then, an outward curling is applied to the small-diameter part 3b with a curling die 10, and a curled part 5 is formed by this curling process. Since the curled part 5 is provided at the upper end of the neck 3, fingers of a user are hardly damaged and furthermore, because of its unexposed structure, the front end of the neck 3 can be protected from erosion resulting from contents.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can with a screw, a method for manufacturing the same, and a container with a lid using the can with a screw.

[0002]

2. Description of the Related Art Conventionally, a can 1 with a screw as shown in FIG.
01 is used. It has a cylindrical neck 10
A screw portion 104 is provided in order to screw the cap 103 and the like around the periphery of the screw 2. Also, the tip 105 of the neck 102
Is flattened by shaving to make it close to the inner surface of the cap 103 or the gasket 106. Such a screw can 101 is formed by forming a thin metal plate of aluminum or the like into a bottomed cylindrical shape, forming the shoulder 107 and the neck 102 by mouth drawing, and forming the tip of the shoulder 107 and the neck 102 at the same diameter as the root diameter of the screw to be formed. The screw portion 104 is formed by drawing and forming into a cylindrical shape having a diameter of about the same, and further deforming the remaining portion into irregularities by roll forming or the like.
The manufacturing method, particularly the forming method of the threaded portion, is described in, for example, JP-A-5-229545.

[0003] In such a screw can 101, in order to protect the surface of the metal plate from corrosion due to the filling contents, or to protect the contents from metal, the inner surface of the can is spray-painted after making the can. In some cases, a synthetic resin coating film is provided by powder coating or the like. In some cases, a synthetic resin film is heat-welded to a thin metal plate, and a can is formed with the film surface inside.

[0004]

The conventional screw can 1 described above.
01 has a corner (edge) because the tip 105 of the neck portion is flattened by shaving, and therefore, the user may feel pain when hit by a finger or the like of the user. Even when a coating or a coating for corrosion prevention is provided, the metal is exposed at the tip 105 of the neck without the coating or coating. Therefore, the metal in that portion may be corroded by the contents. The first technical object of the present invention is to provide a can with a screw that does not hurt even when touched by a user's finger or the like and is gentle on the hand. Further, a second technical problem of the present invention is to provide a can with a screw in which the tip of the neck is hardly corroded by the contents. Further, it is a technical object of the present invention to provide a method for manufacturing such a can with a screw and a container with a lid utilizing the specific properties of the can with a screw.

[0005]

SUMMARY OF THE INVENTION A threaded can according to the present invention is a thin metal can having a neck provided with a threaded portion due to unevenness, the thickness of which is increased at the upper end of the neck. It is characterized in that a curl portion thinner than the thickness is provided. In such a screw can, it is preferable that a coating film or coating is formed on the inner surface side of the can body including the neck portion, and the curl portion is wound outward.

According to the method of manufacturing a screw can of the present invention, a can body having a cylindrical neck portion is formed from a thin metal plate, and a screw portion is formed around the neck portion by irregular deformation while leaving the vicinity of the upper end thereof. The method is characterized in that the vicinity of the upper end is thinned by cutting, and the thinned portion is curled. In this manufacturing method, it is preferable to form a coating film or coating on the inner surface side of the can body and to curl the thinned portion outward at any stage before the curl processing.

[0007] A container with a lid according to the present invention comprises:
A lid that is screwed into the threaded portion of the neck of the threaded can,
It is characterized in that a contact surface is provided at a portion corresponding to the curl portion on the upper inner surface of the lid. In such a container with a lid, a means for taking out the contents may be provided on the lid or the neck, and the means for taking out the content may be provided with a flange portion sandwiched between the curl portion and the contact surface. Further, a second aspect of the container with a lid of the present invention has the above-described screwed can, a lid that is screwed to a threaded portion of the neck, and a means for taking out a content attached to the neck, The take-out means has a fitting portion that fits with the curl portion.

[0008]

Since the curled portion is provided at the upper end of the neck, the corner of the edge of the thin metal plate is caught and is not exposed to the outside. Therefore, even if the user's finger touches the upper end of the neck, no pain is felt. Further, since the thickness of the curled portion is thin, even when the curling is performed after the screwing, deformation such as buckling is not easily generated in the threaded portion. That is, since the screw portion has a helical shape, a load cannot be evenly received over the entire circumference, so that the screw portion is easily buckled. However, in the screw can of the present invention, the thickness of the curl portion is reduced, so that the axial load during curl molding can be reduced. Therefore, the curl processing after the screw processing is easy.

Further, since the thickness of the curl portion is thin, the winding diameter of the curl portion can be reduced. Therefore, the curl width can be reduced, and both effects of securing the area of the opening and screwing the cap can be achieved. When the neck is formed by drawing the upper part of the body into a small diameter,
The neck tends to be thicker than the trunk. Therefore, the advantage of reducing the thickness of the curled portion is further utilized.

[0010] In the case of a threaded can in which a coating or coating is provided on the inner surface of the can body including the neck, the metal at the tip of the curled portion is not exposed, so that the portion is not easily corroded by the contents. When the curled portion is wound outward, the effect of preventing corrosion is further enhanced. Also, molding is easy.

In the method for manufacturing a can with a screw according to the present invention,
Since the curl process is performed after thinning the vicinity of the upper end of the neck by cutting, it is easy to bend. For this reason, the screw portion does not easily buckle during curling. Also, after manufacturing the cylindrical can,
When forming a neck with a smaller diameter than the body by drawing,
The neck tends to be thick. Therefore, the effect of preventing buckling by cutting the neck portion to a small thickness is further enhanced.
In the case where a coating or coating is provided before curling and the curled portion is wound outward, there is an anticorrosion effect on the tip and surface of the curled portion.

In the container with a lid according to the present invention, since there is no corner on the upper surface of the curled portion, there is little possibility of damaging the contact surface or the gasket. Therefore, the lid can be securely fastened to the neck. When the flange portion of the take-out means provided on the lid or the neck is sandwiched between the contact surface of the cover and the curl portion, the take-out means can be firmly held. Further, in the case where the fitting means for fitting the curl portion is provided in the take-out means, there is an advantage that the take-out means can be firmly attached to the neck.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a container according to the present invention. FIG. 1 (a) is a cross-sectional view of a main part showing an embodiment of the threaded can of the present invention, FIG. 1 (b) is a main part process diagram showing one embodiment of a method for manufacturing the screwed can, and FIG. FIGS. 3 (a) and 3 (b) are process diagrams showing the pre-process of the manufacturing method of FIG. 1 (b).
Is a schematic sectional view showing an embodiment of the threaded can of the present invention, FIG. 4 is a sectional view of a main part showing another embodiment of the threaded can of the present invention, and FIGS. It is sectional drawing which shows embodiment of a container.

As can be seen from FIG. 3 (a), which shows the entirety of the can A with a screw shown in FIG. 1, a cylindrical body 1 with a bottom and a shoulder 2 continuous with the upper part of the body 1 are provided. , And a cylindrical neck 3 continuous above the shoulder 2. The body 1 is usually cylindrical, but may be rectangular. The neck 3 is shown in FIG.
As shown in (a), it is composed of a large diameter portion 3a and a small diameter portion 3b whose diameter is somewhat smaller than the large diameter portion. The large diameter portion 3a and the small diameter portion 3b are smoothly continuous in a conical portion.

A screw portion 4 is formed above the large diameter portion 3a. The screw portion 4 reaches the upper end of the large diameter portion 3a. The curled portion 5 which is a feature of the present invention is formed in the small diameter portion 3b. Body 1, shoulder 2, neck 3, and its large diameter portion 3a
Is substantially the same as a conventionally known threaded can. This can A with a screw is manufactured by the following procedure from a blank material obtained by punching a thin metal plate such as aluminum or steel into a circular shape.

The thickness of the metal sheet used is usually from 0.2 to
The thickness is about 1.0 mm, and a coating or coating is provided.
The coating film can be formed by a known method such as spray coating of a synthetic resin such as an epoxy phenol resin, polyamide imide resin, epoxy amino resin, and vinyl resin, or powder coating. The coating is provided in the form of a thin metal plate, but can also be provided after it has been formed into a can. In the case of coating, a known method such as heat bonding a thermoplastic film of polyester, polyethylene terephthalate or the like to a thin metal plate can be provided.

The circular blank material is formed into a bottomed cylindrical shape shown in the first step S1 of FIG. 2 by a known deep drawing process or the like. The outer diameter D of the can is, for example, about 30 to 100 mm. The ironing may be performed after the deep drawing. Further, in the case of aluminum or the like, the slag can be formed into a bottomed cylindrical shape by impact molding or the like.

The shoulder 2 and the neck 3 are formed by necking (drawing) the upper portion of the bottomed cylindrical can, as shown in a second step S2. By performing necking again, as shown in the third step S3,
The diameter of the upper part of the neck 3 can be further reduced to form the lip 3c.

Next, as in the fourth step S4 and the fifth step S5, the thread portion 4 having a corrugated cross section is formed by performing roll forming with a known roll forming machine. The outer diameter of the thread (d1 in FIG. 1A) is, for example, 20 to
The valley diameter (d2) is about 19 to 44 mm. In the case of a conventional screw can, after this molding, shaving is performed with a cutting tool or the like in order to flatten the tip of the neck 3.

However, in this embodiment, as shown in FIG. 1 (b), the tip 3c is further drawn to reduce the diameter of the small-diameter portion 3c.
b is formed (sixth step S6). The remaining part is the large diameter part 3
a. The thickness T of the small diameter portion 3b is, for example, 0.2 to 1
mm. Next, the outer circumference of the small diameter portion 3b is cut to reduce the thickness (seventh step S7). The thickness t in the thinned state varies depending on the curl diameter and the curl width W, but is usually 20 to 70% of the original thickness T (0.14 to 0.7 mm).
About 50 to 60% of the original thickness T. If the thickness is too large, buckling is likely to occur in the screw portion 4 during curl molding, and if the thickness is too small, buckling or cracking will occur in the small diameter portion 3b. At the time of cutting the outer peripheral surface, the tip may be shaved flat.

Then, as shown in an eighth step S8, the small-diameter portion 3b thinned using the curl mold 10 is curled outward. The pressing direction is the axial direction of the can body. By this curl forming, a curl portion 5 is formed as shown in FIG. The outer diameter d3 of the curl portion 5 is smaller than the diameter (inner diameter) of a female screw such as a cap for screwing a cap or the like into the screw portion 4, and is usually smaller than the root diameter d2 of the screw portion 4. Somewhat smaller dimensions. The curl width W is
It is preferable that the diameter is as small as possible within the range that can be molded. However, if the winding diameter is too small, the inner surface coating film is damaged.
mm, particularly preferably about 1.5 to 2.5 mm.

The can A with the screw manufactured as described above
Is provided with a curl portion 5 at the upper end of the neck portion 3,
It is hard to hurt the user's finger. Furthermore, since the tip of the neck 3 is not exposed, it can be protected from corrosion by the contents. In addition, since the curl width W is small, a sufficient opening area can be secured without impairing the function of the screw portion 4 such as tightening the cap with a screw. Further, when the cap is screwed, the inner bottom surface of the cap comes into contact with the curled portion 5, but the curled portion 5 is not deformed even if it is strongly tightened. Further, as will be described later, the lid can be attached using a specific form of the curl portion.

The threaded can A shown in FIG. 3 (a) and FIG. 1 has a thin neck 3 provided on a body 1 via a shoulder 2, but in the case where the body is cylindrical, FIG. As shown in b), the vicinity of the upper end opening of the body 1 can be used as the neck 3 as it is. In this case, it is usually preferable to make the neck 3 somewhat smaller in diameter than the body 1 in order to make the outer peripheral surfaces of the cap and the body 1 flush with each other (see FIG. 7). The position and width of the curled portion 5 and the molding method are substantially the same as those of the case A with a screw shown in FIG. 1 and have the same operational effects.

The threaded can C shown in FIG. 4 is substantially the same as the threaded can A of FIG. 1 except that the curled portion 5 is wound inward. Also in this case, the tip 5a of the curl portion 5, that is, the tip 5a of the small-diameter portion 3b before curling, is in close contact with the root of the curl portion 5 and is not exposed. Therefore, if a coating or coating is provided on the outer surface to be inward by curling, both the metal and the content are protected because the content does not directly touch the exposed portion of the metal. If the outer surface of the can body has no coating or coating because the curl portion 5 is wound inside, a coating film is formed on the curl portion 5 after curling.

In the threaded can C shown in FIG. 4, in order to increase the inner diameter of the curled portion 5, the portion of the small-diameter portion 3b to be curled is somewhat enlarged, and the outer surface is cut to make it thinner. Curled in the direction. But small diameter part 3b
Can be curled by extending straight up without expanding the diameter. In the above-described embodiment, the inner coating film or the coating for protection is provided, but it is not necessary to provide it depending on the contents. Even in such a case, the curl portion provides an effect of protecting the user's finger and the like. When it is not necessary to provide an inner surface coating film or coating, the inner surface side of the small diameter portion 3b may be cut. In addition, the curl can be freely turned inward or outward. Even when the coating film is provided after cutting, the inner surface side of the small diameter portion can be cut.

Next, an embodiment of a container with a lid according to the present invention will be described with reference to FIGS. FIG. 5 shows a container D1 with a lid constituted by the can A with a screw shown in FIGS. 1 to 3 and a cap 15 screwed to the neck 3 thereof. The cap 15 has a disc-shaped top surface 15a and a cylindrical side surface 15b. The cap 15 is formed by drawing a thin metal plate and forming a side surface 15b.
And a conventionally known one in which a female screw portion 16 is formed. However, a cap such as a synthetic resin molded product may be employed. An annular or disk-shaped gasket 17 is fitted or fixed to the lower surface (upper bottom surface) of the top surface 15a. In this case, the outer peripheral portion of the inner surface of the cap 15 can be considered as a contact surface according to claim 5. If the gasket 17 is a part of the cap, the lower surface of the gasket 17 can be considered as the contact surface.

Since the curved surface of the curl portion 5 comes into contact with the gasket 17 in the container D1 with the lid, even if the cap 15 is tightly tightened or repeatedly opened and closed, the gasket
It is hard to be damaged. Therefore, the sealing action can be maintained for a long time. Further, since the can A with a screw provided with an inner coating film provided with an outward curl portion is employed, the same operation and effect as in the case of FIGS.

In a container D2 with a lid shown in FIG. 6, a lid 18 with a pump is attached to the above-mentioned screw can A. The lid 18 is a synthetic resin molded product having a bottomed cylindrical shape and having a guide portion 20 for guiding the push button 19 on the top surface. On the inner surface of the peripheral wall of the lid 18, a female screw 18 a to be screwed with the screw portion 5 of the screw can A is formed. The pump 21 has a housing 22 housed inside the screw can A, a suction pipe 23 movably provided in the housing 22, a push button 19 mounted on an upper end thereof, and a lower end of the housing 22. It is a known device having a dip tube 25. The suction pipe 23 extends upward through the top surface of the lid 18, and the push button 19 slides on the inner surface of the guide 20. The housing 22 has a flange portion that fits with the inner bottom surface of the lid 18. The flange portion 26 and the gasket 27 provided on the lower surface side are sandwiched between the inner bottom surface of the lid 18 and the upper surface of the curl portion 5.

In the container D2 with the lid, when the push button 19 of the pump 21 is pushed, the contents in the housing 22 are ejected from the ejection nozzle 29 of the push button 19 through the suction pipe 23. The point that the finger and the like are hardly damaged by the curl portion 5, the tip of the neck portion 3 is hardly corroded, the gasket 27 is hardly damaged, and the seal is secure is the same as in the case of the container D1 with a lid in FIG.

A container D3 with a lid shown in FIG.
And a roll coater 30 attached to the upper end of the neck 3, and a cap 31 screwed around the neck 3. The threaded can B2 has a cylindrical body 1 with a bottom, a conical shoulder 2 continuous with its upper end, and a neck 3 continuous with its upper end. In this threaded can B2, the width of the shoulder portion 2 is narrow, so that it has a form similar to the threaded can B of FIG. 3 (b). The neck 3 is a large diameter portion 3a having a screw portion 4.
And a small diameter portion 3b continuous therewith, and a curl portion 5 curling outward is formed in the small diameter portion 3b.

The roll coater 30 has a spherical recess 32.
And a ball 34 rotatably held in the recess 32. An opening 35 is formed on the lower surface of the holder 33 to communicate the recess 32 with the inside of the can. A ball 34 covers the opening 35. At the upper end of the concave portion 32 of the holder 33, an annular protrusion 36 for preventing the ball from coming out is provided. Further, an annular groove 37 is formed in the lower portion of the peripheral wall of the holder 33 so as to closely fit the curled portion 5 of the can B2 with a screw. This annular groove 3
Reference numeral 7 denotes a fitting portion according to claim 7. Instead of the annular groove, another type of fitting portion such as a fitting step portion fitting with the upper surface and the outer surface of the curled portion or the upper surface and the inner surface of the curled portion can be provided. The bottom portion 38 of the holder 33 is formed in a columnar shape that closely engages with the inner surface of the curl portion 5, that is, the inner surface of the small diameter portion 3b.

The cap 31 is provided with a roll coater 30.
And a female screw portion 39 to be screwed with the screw portion 4 is formed on the inner surface of the lower end. The roll coater 30 is a means for taking out the contents of claim 7. The container D3 with the lid is removed by removing the cap 31,
When the roll is brought into contact with the application surface of the opponent and rolled, the content coming out of the opening 35 adheres to the surface of the ball 34 and can be further applied to the application surface of the opponent. Further, by fitting the curl portion 5 having a large hoop stress and the annular groove 37,
The holder 33 can be firmly held by the can B2 with a screw. Further, by firmly screwing the cap 31 to the neck 3, the surface of the ball 34 can be protected.

The container D4 with a lid shown in FIG. 8 is substantially the same as the container D2 with a lid shown in FIG. 6, except that an aerosol valve 40 is provided instead of the pump. That is, a female screw part 42 a screwed with the screw part 4 is formed in the upper lid 42, and the housing 41 of the aerosol valve 40 is
A flange portion 43 sandwiched between the inner bottom surface of the upper lid 42 and the curl portion 5 is provided. Gaskets 44 and 45 are interposed between the flange portion 43 and the curl portion 5 and between the flange portion 43 and the inner bottom surface of the upper lid 42, respectively. At the center of the top surface of the upper lid 42, the housing 4
A hole 47 through which a stem 46 provided movably up and down in 1 is inserted.
Are formed. The upper cover 42 is made of a thin metal plate, but may be a synthetic resin molded product. A push button to be attached to the upper end of the stem 46 is omitted.

The container D4 with a lid can be used as an aerosol device by filling the inside of the container D4 with a content composed of a stock solution and a propellant. However, top lid 4
Since 2 is screw tightening, it is preferable to make the internal pressure relatively low. In the container D4 with a lid, the aerosol valve 40 mainly composed of a synthetic resin, the container A with a screw made of metal, and the upper lid 42 can be easily separated and discarded.

In the container D4 with the lid, when the stem 46 is pressed, the aerosol valve 40 is opened, and the contents can be ejected through the stem 46 and the push button in the form of mist, liquid, foam, or the like. The operation and effect based on the screw can A and the operation and effect of sealing the upper lid 42 and the screw can A are substantially the same as those in the case of the container D2 with a lid in FIG.

[Brief description of the drawings]

FIG. 1 (a) is a cross-sectional view of a main part showing an embodiment of a screw can according to the present invention, and FIG. 1 (b) is a main-part process diagram showing an embodiment of a manufacturing method thereof. .

FIG. 2 is a process chart showing a pre-process of the manufacturing method of FIG. 1 (b).

FIGS. 3 (a) and 3 (b) are schematic cross-sectional views each showing an embodiment of the threaded can of the present invention.

FIG. 4 is a cross-sectional view of a main part showing another embodiment of the screw can according to the present invention.

FIG. 5 is a partially sectional side view showing an embodiment of the container with a lid according to the present invention.

FIG. 6 is a partial sectional side view showing another embodiment of the container with a lid according to the present invention.

FIG. 7 is a partially sectional side view showing another embodiment of the container with a lid according to the present invention.

FIG. 8 is a sectional view of a main part showing another embodiment of the container with a lid according to the present invention.

FIG. 9 is a sectional view of a main part showing an example of a conventional screw can.

[Explanation of symbols]

 A Screw can 1 Body 2 Shoulder 3 Neck 3a Large diameter 3b Small diameter 3c Mouth 4 Screw 5 Curl 5a Tip W Curl width D1 Container with lid 15 Cap 16 Female thread 17 Gasket D2 Container with lid 18 Lid 21 Pump 26 Flange 27 Gasket D3 Container with lid B2 Can with screw 30 Roll coater 31 Cap 33 Holder 34 Ball 37 Annular groove 39 Female thread D4 Container with lid 40 Aerosol valve 42 Upper lid 42a Female thread 43 Flange 44 , 45 gaskets

Claims (7)

[Claims] 1. A thin metal can having a neck provided with a threaded portion due to uneven deformation, wherein a curl portion having a thickness smaller than a thickness of the threaded portion is provided at an upper end of the neck portion. A can with screw. 2. A can with a screw according to claim 1, wherein a coating or coating is formed on an inner surface side of the can body including the neck portion, and the curled portion is wound outward. 3. A can body having a cylindrical neck portion is formed from a thin metal plate, and a screw portion is formed around the neck portion by uneven deformation while leaving the vicinity of the upper end thereof, and then the vicinity of the upper end is cut to form a thin wall. Wherein the thinned portion is curled. 4. The method according to claim 1, wherein a coating or coating is formed on the inner surface of the can body at any stage before the curling, and the thinned portion is curled outward. Item 3. The production method according to Item 3. 5. A can with a screw according to claim 1 or 2, and a lid screwed into a threaded portion of a neck portion thereof, wherein an abutment surface is formed at a portion corresponding to a curled portion on an upper inner surface of the lid. The container with a lid characterized by being provided. 6. A method according to claim 5, wherein said cover or neck is provided with a means for taking out the contents, and said means for taking out has a flange portion sandwiched between the curl portion and the contact surface. Container with lid. 7. A can with a screw according to claim 1 or 2, a lid screwed into a screw portion of a neck portion thereof, and a take-out means for taking out a content attached to the neck portion, wherein the take-out means comprises: A container with a lid, comprising a fitting portion fitted with a curl portion.