JPH0538476A - Wax applying method and its applying device - Google Patents

Abstract

PURPOSE:To apply uniformly wax as a lubricant for necking on the outer peripheral face of an opening of a can such as an aluminum can. CONSTITUTION:A guide plate 11 is disposed above a wax pan 12, and an aluminum can 1 is rolled and carried along the upper face of the plate. An applicator roller 27 extending along the carrying direction of the aluminum can 1 is disposed on the side direction of the guide plate 11, and its outer peripheral face is rotated while being brought into contact with the outer peripheral face of an opening 1a of the aluminum can 1 and the outer peripheral face of a pickup roller 22 immersed in wax W. The wax W stuck on the outer peripheral face of the pickup roller 22 is made to stuck to the outer peripheral face of the applicator roller 27 while being scraped down by a doctor roller 26, and said wax W is applied for coating on the outer periphery of the opening 1a of the aluminum can 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a necking device for reducing the diameter of an opening of a can body in the manufacturing process of a bottomed cylindrical can body such as an aluminum can for containing drinking water or beer. The present invention relates to a wax applicator, which is provided on the outer peripheral surface of the opening of the can and applies a wax for preventing seizure during necking.

[0002]

2. Description of the Related Art In recent years, aluminum cans have been used as containers for holding soft drinks, beer, etc.
Since the wall thickness is thin and easily deformed, a so-called necking process is performed before the opening at the one end is closed so that the peripheral wall near the opening is gradually reduced in diameter to increase rigidity.

By the way, in this necking process, as shown in FIG. 1, the opening 1a of the aluminum can (can body) 1 is inserted into the body 1
The sizing die 2 having an inner diameter smaller than the outer diameter of b is fitted and reduced in diameter with a predetermined pressure. However, when the aluminum can 1 and the sizing die 2 are not sufficiently slipped, There was a case where seizure occurred in a part.

Therefore, conventionally, as shown in FIG. 2, a lubricant applying device 4 is installed in front of the necking device 3, and the outer peripheral surface of the portion of the aluminum can 1 to be necked by the lubricant applying device 4. A solvent (hexane) mixed type lubricant is applied to.

More specifically, the lubricant applying device 4 will be described.
As shown in FIG. 3, is a guide plate 5 on which the aluminum can 1 is rolled and conveyed in a direction orthogonal to the axis thereof, and a solvent-mixed lubricant L disposed below the guide plate 5.
, A coating pad 7 made of a porous body arranged parallel to the conveying direction of the aluminum can 1 on one side of the guide plate 5, and the aluminum can 1 is pressed from above. And a conveyor belt 8 for conveying while rolling on the guide plate 5, the lower end portion of the application pad 7 is inserted into the lubricant L in the pan 6, and the upper end surface is The outer peripheral surface of the opening of the aluminum can 1 in the transporting state is brought into contact with it.

The lubricant L is sucked up from the inside of the pan 6 to the upper end surface side by the capillary action of the application pad 7, and is applied to the outer peripheral surface of the aluminum can 1 which is rolled in contact with the upper end surface. It is supposed to be done.

[0007]

By the way, the conventional lubricant applying device described above has the following problems.

That is, the lubricant L in the pan 6 is guided to the application portion by the capillary action of the application pad 7.
Due to the non-uniformity of the porosity of the coating pad 7, the amount of the lubricant L introduced to the upper surface of the coating pad 7 is not constant.

When the lubricant L is applied, the application pad 7 is slightly pressed and deformed by the aluminum can 1, and the lubricant L is squeezed out by the aluminum can 1 to apply the lubricant L to the aluminum can 1. However, the amount of the lubricant L squeezed out changes due to the change in the contact state between the aluminum can 1 and the application pad 7.

Further, the aluminum can 1 is continuously conveyed on the upper surface of the coating pad 7, but in order to suppress the variation in the coating amount of the lubricant L, the speed of sucking up the lubricant L by the coating pad 7 As a result, the supply speed of the aluminum can 1, that is, the transfer speed is limited.

As described above, in the conventional technique, the amount of the lubricant L applied to the aluminum can 1 is not stable, which greatly affects the smoothness of the necking process in the necking device 3 in the subsequent stage. ..

Further, the transportation speed of the aluminum can 1 is limited in the lubricating oil coating device 4, which has a great influence on the production efficiency.

On the other hand, in the above-mentioned prior art, since the solvent-mixed type lubricant is used, the concentration thereof largely depends on the amount of the replenishment of the solvent, and the solvent is hexane or the like as described above. Since it is a substance having high volatility in many cases, and therefore, replenishment control of the solvent including the volatile matter must be performed, the concentration control of the lubricant is complicated.

Further, since the solvent is volatile, the working environment is deteriorated in the closed space of the factory, which is not preferable for the health of the worker.

Furthermore, solvents such as hexane are extremely flammable and require strict safety control.

[0016]

SUMMARY OF THE INVENTION The present invention has been made as a solution to the above-mentioned conventional inconvenience, and a coating method according to claim 1 has a bottomed cylindrical can body in a direction perpendicular to its axis. Along with the outer surface of the opening of the can body, the outer surface of the coating roller having a rotation axis along the rolling direction of the can body is brought into contact, and the surface of the coating roller is solvent-free. It is characterized in that the solventless wax adhering to the application roller is applied to the outer peripheral surface of the can body by adhering and rotating the wax.

Further, the coating device according to the second aspect is provided in a front stage of a necking device for reducing the diameter of the opening of the can body so as to coat the outer peripheral surface of the opening of the can body with wax. A wax coating apparatus, wherein the can body is roll-conveyed in a direction orthogonal to its axis,
The wax pan containing the wax and the outer peripheral surface of the opening of the can body, which is arranged parallel to the carrying direction of the can body on one side of the guide plate and is in the carrying state, are brought into contact with each other. And a coating roller for coating the outer peripheral surface of the opening of the can body with the wax in the wax pan.

Further, in the coating apparatus according to the third aspect, in the coating apparatus according to the second aspect, the length of the coating roller is set to be larger than the outer peripheral length of the can body, and both end portions of the coating roller and the both ends thereof. At least one of the peripheries of the portion is provided with a contact prevention portion for preventing contact between the outer peripheral surface of the opening of the can and the application roller.

In the above wax coating device,
In order to apply the wax more uniformly, the wax pan is provided with a supply roller that is soaked in the wax in the wax pan and a part of the outer circumference is exposed to the outside of the wax. It is preferable to bring the exposed portion outside the wax into contact with the outer peripheral surface of the application roller. Furthermore, by providing an adjusting roller that abuts the supply roller at a position on the side of the exposed portion of the supply roller that is exposed to the outside of the wax on the side opposite to the rotation direction of the supply roller with respect to the contact portion with the application roller. It is possible to more evenly eliminate uneven coating by uniforming the supply amount of. By providing a contact pressure adjusting mechanism for adjusting the contact pressure of the applying roller and the adjusting roller with respect to the supply roller, the wax application amount can be set to a necessary minimum.

[0020]

EXAMPLES An example of a coating apparatus according to claims 2 to 6 of the present invention will be described below.

In the following description, the same parts as those of the prior art are designated by the same reference numerals to simplify the description.

In FIG. 4, reference numeral 10 indicates a wax coating apparatus according to this embodiment, and this wax coating apparatus 1
No. 0 is a wax coating provided at the front stage of the necking device 3 for reducing the diameter of the opening 1a of the aluminum can 1 so that the solventless wax W is applied to the outer peripheral surface of the opening 1a of the aluminum can 1. A guide plate 11 for transporting the aluminum can 1 in a direction orthogonal to the axis of the device.
And a wax pan 12 accommodating the wax W,
As shown in FIG. 4, the outer peripheral surface of the opening 1a of the aluminum can 1 which is arranged parallel to the carrying direction of the aluminum can 1 and is in contact with one side of the guide plate 11 is in contact. At the same time, the wax w in the wax pan 12 is applied to the outer peripheral surface of the opening 1a of the aluminum can 1 to form a coating roller 13.

Next, the details of these will be explained. As shown in FIG. 5, the wax pan 12 is mounted on the base 14 in a substantially horizontal state, and the opening 12a formed above the wax pan 12 is formed. The guide plate 11 is mounted so as to cover it.

Also, as shown in FIG. 4, the wax pan 1
A heater 15 for heating and melting the wax W accommodated therein is attached to the lower surface of 2.

The guide plate 11 comprises a plurality of ridges 16 formed along the transport direction of the aluminum can 1 at intervals in the axial direction of the aluminum can 1. The aluminum can 1 is supported.

This is because the aluminum can 1 is a guide plate 11
This is a measure taken to reduce the rolling resistance by reducing the contact area with the guide plate 11 when it is conveyed over.

Above the guide plate 11,
Side plates 17 and 18 substantially orthogonal to the guide plate 11 are arranged at predetermined intervals on both sides of the aluminum can 1 in the carrying direction.

The side plates 17 and 18 are attached to a stay 19 (only one of the stays 19 is shown in FIGS. 4 and 5) standing on the base 14 by bolts 20 and 2.
Aluminum can 1 which is attached via 1 and transported
The aluminum can 1 is positioned so as to be opposed to both axial ends of the aluminum can 1.
It is designed to perform axial positioning of the.

The spacing between them is the same as the bolt 20.
・ 21 adjusts according to the length of the aluminum can 1.

On the other hand, in the present embodiment, as shown in FIG. 4, a pickup roller (supply roller) 22 is arranged in the wax pan 12 along the transport direction of the aluminum can 1. This pickup roller 22 is
While being immersed in the wax W in the wax pan 12, a part of the outer periphery is exposed to the outside of the wax W, and is rotatably supported by the wax pan 12 in this state.

As shown in FIG. 5, one end of the rotary shaft 23 of the pickup roller 22 is projected from the wax pan 12 to the outside, and the picked-up roller 22 is attached to the projected end. The drive motor 24 that makes rotation is connected via a belt 25.

Then, the pickup roller 22
As shown in FIG. 4, a doctor roller (adjustment roller) 26 and an applicator roller 27 are arranged in parallel with each other in a portion exposed above the liquid surface of the wax W.

The doctor roller 26 and the applicator roller 27 are rotatably connected to each other by connecting plates 28 at both ends thereof, and the connecting plates 28 are connected to the connecting plates 28 in the radial direction of the pickup roller 22. A connecting rod 29 along the is connected rotatably.

The connecting rods 29 are slidably inserted into a frame 30 attached to the wax pan 12 in parallel with the axis of the pickup roller 22.
The pick-up roller 2 of the frame 30 is provided at the end opposite to the side connected to the connecting plate 28.
A position adjusting nut 31 that is brought into contact with the surface opposite to the side facing 2 is screwed.

A compression spring 32 is interposed between the frame 30 and each of the connecting plates 28. The compression spring 32 is elastic in a direction in which the connecting plate 28 is separated from the frame 30. By emitting, the doctor rollers 26 and the applicator roller 27 are brought into contact with the outer peripheral surface of the pickup roller 22. The connecting plate 28, the connecting rod 29, the frame 30, the position adjusting nut 31, and the compression spring 32 constitute the contact pressure adjusting mechanism of this embodiment.

The applicator roller 27 abutted on the pickup roller 22 in this manner
As shown in FIG. 4, its upper end is held at substantially the same height as the upper surface of the guide plate 11, and the body portion is a small distance from the edge of the aluminum can 1 on the side of the opening 1a during transportation. The aluminum can 1 is brought into contact with the outer peripheral surface of the aluminum can 1 at the position where it enters the 1b side. In this embodiment, the applicator roller 27 is the application roller 13.

Then, the applicator roller 27
Has a length S ₁ (see FIG. 6) longer than the circumference of the aluminum can 1.

Further, in this embodiment, as shown in FIG. 6, the guide plate 11 projects upward at the front and rear ends of the guide plate 11 at the positions facing the both ends of the applicator roller 27. A raised portion (contact prevention portion) 11a is formed. Sloping surfaces 11a ₁ and 11a are provided at both end portions of these raised portions 11a along the aluminum can carrying direction.
a ₂ are formed, and these inclined surfaces 11 a ₁ and 11 a
The distance S ₂ between the tips of ₁ is set to be slightly longer than the circumference of the aluminum can 1, and when the aluminum can 1 is conveyed to both ends of the applicator roller 27, the aluminum can 1 is It is pushed up to prevent contact between the outer peripheral surface of the opening of the aluminum can 1 and the applicator roller 27.

On the other hand, above the guide plate 11, as shown in FIG. 5, a pair of conveying devices 33 and 34 are provided along the conveying direction.

The conveying device 34 provided on the upstream side is composed of two belts 35 stretched so as to have a portion parallel to the guide plate 11 and a tensioner 36 for adjusting the tension of these belts 35. ing.

Further, the transfer device 33 provided on the downstream side
Is also two belts 37 stretched so as to have a parallel part with the guide plate 11, a tensioner 38 for adjusting the tension of these belts 37, and the parallel part is elastically moved toward the guide plate 11 side. It is configured by a pressing roller 39 that suppresses the floating of the parallel portion by pressing.

Then, each of these transport devices 33 and 34
In this case, the aluminum can 1 is rolled while being pressed against the guide plate 11 by the belts 35 and 37, so that the aluminum can 1 is sequentially conveyed to the downstream side.

Further, the transport speed of the downstream transport device 33 is set to be higher than the transport speed of the upstream transport device 34.

Next, the operation of the wax coating apparatus 10 of the present embodiment having the above-described structure and the coating method according to claim 1 will be described.

First, the solvent-free wax W is put into the wax pan 12, and the wax W is heated to a predetermined temperature by the heater 15.

After the wax W has a predetermined viscosity by such a heating operation, the drive motor 24 is activated to rotate the pickup roller 22.

As the pickup roller 22 rotates, the doctor roller 26 and the applicator roller 27 that are in contact with the pickup roller 22 are also rotated at the same time, and the wax W in the molten state is transferred to the pickup roller 22. It adheres to the outer peripheral surface and is fed upward.

The wax W fed upward by the pickup roller 22 is first scraped off by the doctor roller 26, and then the excess amount of the wax W is scraped off.
It is fed to the applicator roller 27 side of the latter stage, and is attached so as to be transferred from the pickup roller 22 to the applicator roller 27 at the contact portion with the pickup roller 22.

In this way, the wax W is continuously fed from the wax pan 12 to the applicator roller 27 in an appropriate amount.

Then, the applicator roller 27
To adjust the supply amount of the wax W to the doctor roller 26, the position adjusting nut 31 is rotated to move the doctor roller 26, the applicator roller 27, and the pickup roller 22.
This is done by adjusting the contact pressure with.

As a result, the aluminum cans 1 are continuously conveyed onto the guide plate 11 by the conveying devices 33 and 34, and the outer peripheral surface near the opening 1a is brought into contact with the applicator roller 27, whereby the outer peripheral surface is The wax W is applied.

More specifically, the aluminum can 1 is continuously supplied from an unillustrated hopper or the like to the conveying device 34 arranged on the upstream side in the same posture by its own weight or the like, and the conveying device 34 makes a constant speed. Is sent to the downstream transport device 33.

The downstream transport device 33 transports the aluminum cans 1 at a speed higher than that of the upstream transport device 34, so that a predetermined gap is formed between the aluminum cans 1 continuously. Transport.

At the time when the aluminum can 1 conveyed by the conveying device on the downstream side approaches the end of the applicator roller 27, at least the opening 1a thereof is moved upward by the raised portion 11a formed on the guide plate 11. Raised to prevent contact with the end of the applicator roller 27.

This is the applicator roller 27.
This is a measure taken to prevent the wax W adhering to the end surface of No. 1 from moving to the outer peripheral surface of the end portion of the applicator roller 27 as it rotates and rising up, and the excessive wax W being applied.

In this way, the applicator roller 2
The aluminum can 1 is separated from the raised portion 11a after a treatment for preventing excessive application at the end portion of 7 is performed, so that the opening portion 1a is lowered toward the applicator roller 27, and the raised portion is lifted. When completely separated from 11a, the opening 1a is brought into contact with the outer surface of the applicator roller 27.

Here, since the applicator roller 27 is continuously rotated and the aluminum can 1 is also moved in the axial direction of the applicator roller 27 while rolling, the aluminum can 1 and the applicator roller 27 are also rotated. The contact locus on the outer surface of the applicator roller 27 is spiral as shown by the curve A in FIG. 7, and since the aluminum cans 1 are continuously conveyed, a plurality of contact loci A are parallel to each other. Formed in the state.

Now, considering that the wax W is evenly applied to the aluminum can 1, it is preferable that the contact loci A do not overlap not only with the single contact locus A itself but also between the adjacent contact loci A. ..

This is easily controlled in relation to the transport speed of the aluminum can 1 and the rotation speed of the applicator roller 27.

That is, the transport speed of the aluminum can 1 is V (can / min), and the rotation speed of the applicator roller 27 is n (r).
pm) and the diameter of the applicator roller 27 is D (c
m), where the application width of the wax W is a, the relationship between the rotation speed n of the applicator roller 27 that prevents the contact loci A from overlapping and the transport speed V of the aluminum can 1 is expressed by the following equation.

[0061]

[Equation 1]

In a normal production line, the transport speed V of the aluminum can 1 is set according to the production plan.
The rotation speed n of the applicator roller 27 should be set according to the following equation by the transport speed V.

[0063]

[Equation 2]

The following table shows the theoretical values of the relationship between the rotation speed n of the applicator roller 27 and the transport speed V of the aluminum can 1, divided into three stages: normal line, high-speed line, and ultra-high-speed line. ..

[0065]

[Table 1]

Although the theoretical value is obtained in this way, in the actual line, the aluminum can 1 may be displaced during the transportation of the aluminum can 1. In this case, in this case, the applicator is more than the theoretical value in the preceding table. The rotation speed n of the roller 27 is accelerated by a certain amount, and as shown in FIG.
Is preferably formed.

The coated aluminum can 1 is pushed up by the raised portion 11a formed on the guide plate 11 at the downstream end of the guide plate 11 to reach the end of the applicator roller 27. The formed wax W is supplied to the necking device 3 in the subsequent stage while avoiding contact with the pooled portion.

As described above, according to the wax coating apparatus according to the present embodiment, the wax W in the wax pan 12 is a solventless wax and its concentration is kept constant.
Further, the wax W is forcibly pulled up by the pickup roller 22, then adjusted to an appropriate amount by the doctor roller 26, and then adhered to the applicator roller 27. The supply amount of is uniform.

Further, since the applicator roller 27 forcibly applies the wax W to the aluminum can 1, the application to the aluminum can 1 is also uniform.

Further, as described above, the application and concentration of the wax W on the aluminum can 1 becomes uniform, so that even if the coating width B viewed from the radial direction of the aluminum can 1 is narrowed, a sufficient amount is obtained. Can be applied, resulting in wax W
The consumption amount of is reduced.

The shapes and dimensions of the constituent members shown in the above embodiment are merely examples, and can be variously changed based on the shape and design requirements of the applied aluminum can 1.

For example, in the above-mentioned embodiment, the example in which the pair of connecting plates 28 are independently used is shown.
Instead of this, as shown in FIG. 8, both connecting plates 28 may be connected to each other by a stabilizer 40.

With such a structure, the doctor roller 26 and the applicator roller 27 have a rigid supporting structure to prevent them from twisting, thereby scraping the wax w pulled up by the pickup roller 22 and The amount of adhesion to the applicator roller 27 is determined by the pickup roller 22
Can be made more uniform in the length direction.

Further, an example is shown in which the mechanism for adjusting the contact pressure between the doctor roller 26 and the applicator roller 27 and the pickup roller 22 is constituted by the rotation of the position adjusting nut 31 screwed to the connecting rod 29. However, the position adjustment nut 31
A digital counter 41 that detects the amount of rotation of the position adjusting nut 31 may be provided between the frame 30 and the frame 30.

As a result, the digital counter 4
The display of 1 makes it possible to quantitatively grasp the contact pressure and ensure reproducibility.

Further, the threaded portion between the position adjusting nut 31 and the connecting rod 29 is a fine screw to enable fine adjustment by the position adjusting nut 31, and the oil impregnated bearing 42 is provided at the sliding portion between the connecting rod 29 and the frame 30. May be provided to narrow the gap between the connecting rod 29 and the frame 30 to suppress the shake of the applicator roller 27.

Furthermore, the doctor roller 27 may be omitted, and the pickup roller 22 may be omitted by increasing the diameter of the applicator roller 27.

Further, although the raised portion 11a is provided on the guide plate 11 in the above-mentioned embodiment, the present invention is not limited to such a mode. For example, FIGS.
As shown in FIG. 5, in the opening 12a of the wax pan 12,
A frame-shaped cover 50 having a punched-out portion 50a that exposes the applicator roller 27 is provided, and a substantially doglegged shape having a raised portion 11a at a position facing both ends of the applicator roller 27 of the cover 50 is provided. The plate 51 may be attached.

Also in the examples shown in FIGS. 12 to 15, inclined surfaces 11a ₁ and 11a ₂ are formed on both ends of the raised portion 11a, and the distance S ₂ (the distance between the tips of the inclined surfaces 11a ₁ and 11a ₁ is S ₂ ( 12) is slightly longer than the circumference of the aluminum can 1, and the total length S _{1 of the} applicator roller 27 (see FIG. 1).
(See 4)). Further, in this example, since the groove portion 52 is formed in the plate 51, the effect that wax does not adhere to the plate 51 and the cover 50 is obtained.

Here, in the above example, both of the applicator rollers 27 are used as contact preventing portions for preventing contact between the both ends of the applicator roller 27 and the aluminum can 1.
Although the example in which the raised portions 11a are provided around the both ends of the applicator roller 27 has been described, instead of or in addition to these, both ends of the applicator roller 27 are tapered so that the diameter gradually decreases as they go to each end. May be formed to prevent contact between the both ends of the applicator roller 27 with the aluminum can 1.

In each of the above examples, the case where wax is applied to the aluminum can 1 has been described, but any material can be used as long as it can be a necking target, and it is naturally applied to iron cans and the like. I will get it.

[0082]

As described above, in the wax coating method according to the first aspect of the present invention, the can body is rolled along the direction orthogonal to the axis of the can body, and the outer peripheral surface of the opening portion of the can body is provided with The outer surface of a coating roller having a rotation axis along the rolling direction of the can body is brought into contact with the surface of the coating roller, and a solvent-free wax is adhered to the surface of the coating roller to rotate the coating roller. A wax is applied to the outer peripheral surface of the can body, and has the following excellent effects.

By forcibly applying the solvent-free wax to the can body with the application roller, uniform wax application can be surely performed.

By using the solvent-free wax, it is possible to suppress the change in the wax concentration and also to make the applied wax uniform.

Further, by using the solvent-free wax, it is possible to suppress the change of the wax concentration and simplify the concentration control, and to suppress the production of volatile substances to improve the working environment. ..

Further, the coating device according to the second aspect is provided in the preceding stage of the necking device for reducing the diameter of the opening of the can body, and applies the wax to the outer peripheral surface of the opening of the can body. A wax coating apparatus, wherein the can body is roll-conveyed in a direction orthogonal to its axis,
The wax pan containing the wax and the outer peripheral surface of the opening of the can body, which is arranged parallel to the carrying direction of the can body on one side of the guide plate and is in the carrying state, are brought into contact with each other. And a coating roller that coats the wax in the wax pan on the outer peripheral surface of the opening of the can body. The coating method according to claim 1 can be effectively carried out. And so on.

Further, according to the coating apparatus of the third aspect, it is possible to eliminate the excessive wax adhesion to both ends of the application roller to the can body and eliminate the wax application unevenness.

Further, according to the coating apparatus of the fourth aspect, since the wax is supplied to the coating roller through the supply roller, the uneven coating of the wax on the coating roller can be eliminated and the wax can be coated more uniformly. Claim 5
According to the coating device described above, the amount of wax applied to the applying roller can be made more uniform, and the unevenness of wax application can be eliminated more reliably. Further, according to the wax application device of the sixth aspect, it is possible to reduce the wax consumption amount by narrowing the supply amount of the wax to the application roller to a necessary minimum while realizing the uniform application of the wax to the can body.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a necking method of a can body.

FIG. 2 is a schematic front view for explaining the relationship between a wax coating device and a necking device.

FIG. 3 is a vertical cross-sectional side view showing a structural example of a conventional wax coating device.

FIG. 4 is a vertical sectional side view of the wax coating apparatus according to the embodiment of the present invention.

FIG. 5 is a front view of a wax coating device according to an embodiment of the present invention.

FIG. 6 is a schematic front view showing a guide plate of the wax coating apparatus according to the embodiment of the present invention.

FIG. 7 is a schematic view of a contact locus between a can body and a coating roller of the wax coating apparatus according to the exemplary embodiment of the present invention as seen on the coating roller.

FIG. 8 is a plan view showing a modified example of the support structure for the coating roller and the doctor roller.

FIG. 9 is a partial cross-sectional lower side view showing another modified example of the support structure for the coating roller and the doctor roller.

FIG. 10 is a right side view of a wax coating device according to another embodiment of the present invention.

11 is a cross-sectional view showing a wax pan and its surroundings of the wax applying apparatus shown in FIG.

12 is a view from the direction of the arrow XII in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

14 is a perspective view showing a state where a can body passes over the applicator roller shown in FIG.

15 is a sectional view taken along line XV-XV in FIG.

[Explanation of symbols]

 1 Aluminum Can (Can) 1a Opening 1b Body 3 Necking Device 10 Wax Applying Device 11 Guide Plate 11a Raised Part (Contact Prevention Part) 12 Wax Pan 13 Applying Roller 22 Pickup Roller (Supplying Roller) 26 Doctor Roller (Adjusting Roller) ) 27 Applicator roller (application roller)

Claims (6)

[Claims] 1. A bottomed cylindrical can body is rolled along a direction orthogonal to its axis, and a rotation axis along the rolling direction of the can body is provided on the outer peripheral surface of the opening of the can body. By applying the solventless wax to the surface of the coating roller by contacting with the outer surface of the coating roller, the solventless wax adhered to the coating roller is applied to the outer peripheral surface of the can body. A method for applying a wax, which comprises: 2. A wax applicator for applying wax to the outer peripheral surface of an opening of a cylindrical can body having a bottom, wherein the can plate is roll-conveyed in a direction orthogonal to its axis, The wax pan containing the wax and the outer peripheral surface of the opening of the can body, which is arranged parallel to the carrying direction of the can body on one side of the guide plate and is in the carrying state, are brought into contact with each other. And a coating roller configured to coat the outer peripheral surface of the opening of the can body with the wax in the wax pan. 3. The length of the coating roller is set to be larger than the outer peripheral length of the can body, and at least one of the both ends of the coating roller and the periphery of the both ends is
The wax coating apparatus according to claim 2, further comprising a contact prevention unit that prevents contact between the outer peripheral surface of the opening of the can and the coating roller. 4. The wax pan is provided with a supply roller that is soaked in the wax in the wax pan and a part of the outer periphery of the wax pan is exposed to the outside of the wax pan. The wax coating device according to claim 2 or 3, wherein the exposed portion and the outer peripheral surface of the coating roller are in contact with each other. 5. The wax coating apparatus according to claim 4, wherein a position of the exposed portion of the supply roller outside the wax is located on a side opposite to a rotation direction of the supply roller with respect to a contact portion with the coating roller. A wax applicator which is provided with an adjusting roller that comes into contact with the supply roller. 6. The wax applying apparatus according to claim 5, further comprising a contact pressure adjusting mechanism for adjusting a contact pressure of the applying roller and the adjusting roller with respect to the supply roller.