JP6541121B2 - Can body and method of manufacturing can body - Google Patents

Description

  The present invention relates to a can and a method of manufacturing the can.

  In the field for cans, the switch to laminated cans using laminated steel plates is in progress (see, for example, Patent Document 1). This is because the laminated steel plate is superior in corrosion resistance, scratch resistance (hardness to wrinkles) and the like compared to the conventional coated steel plate and the like, and is well evaluated in the market.

JP 2008-080594 A

As cans, for example, 18 L cans and scaled cans (the ones with different heights of 18 L cans) are known. In addition, below, unless there is particular notice, "18 L can" and "size change can" are collectively called "18 L can."
By the way, in the field of 18L cans, laminated steel plates are used as members of can barrels, but are not used as members of can lids. Although the can lid part becomes a grounding part in part, it has the problem of rust etc. like the other part.
Then, the present inventor examined using a laminated steel plate as a member of a can lid part from a viewpoint of improving corrosion resistance of an 18L can.
As a result, it has become clear that when the laminated steel plate is used as a member of the can lid, the can becomes slippery, which hinders the conveyance of the can. Specifically, for example, when transported by a metal roll conveyor, it became clear that the transport roll slips due to slippage of the can relative to the transport roll, and the transport of the can may be delayed. . If conveyance is delayed, problems such as the cans coming in contact with each other in the line or the cans falling due to the impact of the contact may occur. Moreover, when conveying in the state which laminated | stacked multiple steps | stages, without fixing a can, the problem in which a can slip | deviates or drops out by small impact generate | occur | produces.

  This invention is made in view of the above point, and an object of this invention is to provide the can excellent in both corrosion resistance and slip resistance.

The present inventors have found that the above object can be achieved by adopting the following configuration. That is, the present invention provides the following (1) to (7).
(1) A can comprising a can body having a cylindrical or rectangular shape and a can lid joined to both end surfaces of the can barrel, wherein the member constituting the can lid is a laminated steel plate A portion of at least one of the can lids is a grounding portion, the non-slip coating is applied to the grounding portions, and the grounding portion is grounded to a surface made of a member constituting the can lids. The can body whose dynamic friction coefficient measured by making it be 0.27 or more.
(2) The can according to (1), wherein the dynamic friction coefficient is 0.30 or more.
(3) The can according to the above (1) or (2), which has the above-mentioned ground contact portion on which the above-mentioned anti-slip coating is applied to both of the above-mentioned can lids.
(4) The paint used for the anti-slip coating contains a non-slip component, and the solid content of the non-slip component is 3 to 10% by mass with respect to 100% by mass of the total solid content in the above-mentioned paint The can according to any one of the above (1) to (3).
(5) The can according to the above (4), wherein the non-slip component is rosin.
(6) The can according to any one of the above (1) to (5), which is at least one of an 18 L can and a scaled can.
(7) A method for producing a can according to any one of (1) to (6) above, comprising the steps of: preparing a can having the can body and the can lid; And D. applying the anti-slip coating to the ground contact portion which is a part of the can lid portion of the can body.

  According to the present invention, it is possible to provide a can which is excellent in both corrosion resistance and slip resistance.

It is a perspective view showing a can. It is the perspective view which looked at the can from the bottom side. It is a sectional view showing a part of can. It is a schematic diagram which shows the test method for measuring the dynamic friction coefficient of a can.

<The process to reach the completion of the present invention>
First, the circumstances under which the present inventor has completed the present invention will be described.
Generally, in order to improve the slip resistance (make the slip resistant), it is conceivable to change the shape and to provide a mechanism in which the unevenness is physically engaged. In the case of a can body, it is conceivable to devise a structure (shape) of the can body and adopt a structure in which physical sticking is possible when stacked. However, this method can not improve the slip resistance on the roll conveyor even if it is effective at the time of stacking the cans. In addition, it is difficult to adopt considering that the shape of the can body is impaired. In order to improve the slip resistance without changing the structure of the can, it is conceivable to increase the coefficient of friction of the surface.
Then, the present inventor tried surface modification of a laminated steel plate paying attention to the static friction coefficient of a flat plate as an index of a friction coefficient. However, even if the static friction coefficient is equivalent to that of, for example, a conventional coated steel sheet, it has become clear that the slip resistance of the can is significantly inferior to the case where the coated steel sheet is used. That is, it was found that the static friction coefficient of the flat plate was not an indicator of the slip resistance of the can body.
For example, the static friction coefficient of the flat plate of Comparative Example 1 (painted steel plate) described later is 0.31, the static friction coefficient of the flat plate of Comparative Example 2 (laminated steel plate) is 0.32, and the static friction of both flat plates The coefficients were almost equal, but the latter was inferior to the former in slip resistance. From this, it is understood that the slip resistance of the can body can not be evaluated even by evaluating the static friction coefficient of the flat plate.

Problems were also found in how to increase the coefficient of friction. Examples of a method of increasing the coefficient of friction include increasing the surface energy and providing fine asperities on the surface. Therefore, we thought that a PET (polyethylene terephthalate) film with higher surface energy is more advantageous than an olefin film such as polypropylene (PP) as a film used for laminated steel plates, but there is no big difference in these and sufficient effects can be obtained It was not. Moreover, although the method of making an unevenness | corrugation on a laminate film surface by laser processing was examined, a sufficient effect was not acquired here.
In addition, when the film itself is improved, it becomes a special specification film, resulting in a significant increase in cost. That is, since the small-scale production of a film is difficult, it is inefficient when producing a special product, resulting in a significant increase in cost.
Then, it came to study the means to paint on the surface of a lamination steel plate. The paint used for coating has a wide range of original variations as compared to the laminate, and can be easily rotated in the manufacturing process, so even special products can be manufactured relatively inexpensively. However, in any case, it is inevitable to increase the cost as compared with the conventional material, so it is necessary to devise to keep the cost as low as possible.

The problems are summarized in the following three points. (1) The coefficient of static friction of a flat plate may not be able to evaluate the slip resistance of the can body. (2) The improvement of the laminate film leads to an increase in cost. (3) Even in the case of coating on the surface of a laminated steel sheet, the cost increases. From these viewpoints, a detailed investigation was conducted on the slip of the can.
The coefficient of static friction in flat plates is highly likely that the slip resistance in cans can not be evaluated. First, cans using laminated steel plates and cans using conventional materials (paint TFS, bare-frying) I examined the difference in how to slide. As a result of observing the sliding behavior on the inclined surface, in the case of using the conventional material, it does not slip at once even if it starts sliding, and there is also a case that stops in the middle. The result was a quick slide. From this, it was estimated that the slippage of the laminated steel sheet is due to the characteristic that it is difficult to stop once it starts to slip. From such a point of view, the present inventor came to the idea of using a material having a high coefficient of dynamic friction. When a can was made from a material having a high coefficient of dynamic friction and a transfer test was conducted, it was found that it was difficult to slip even in actual transfer.
As a method of increasing the coefficient of dynamic friction, a method of anti-slip coating on a laminated steel plate was adopted. And by painting only on the grounding part of the can lid part, coating of unnecessary parts is omitted, and it is designed to be economically minimum load.
Although the outline of the improvement was decided by the above examination, another problem remained. That is, when the coefficient of dynamic friction on a flat plate is used as an index, even if the coefficient of dynamic friction is the same, if it is used as a can, uniform effects can be obtained depending on the type, shape and manufacturing conditions of the can. The problem is that it is not always possible. In the case of an 18L can (including a variable-sized can), the top of the wound portion is the ground portion, but the ground area and the ground point are different depending on the shape of the wound portion and the distortion of the can. From this, I came to think of evaluating the measurement of the coefficient of dynamic friction with a can. When the dynamic friction coefficient and the slip resistance in the can body were confirmed, it was confirmed that a good correlation was obtained.

<Preferred embodiment>
Next, preferred embodiments of the present invention will be described based on FIGS. 1 to 3. Although FIGS. 1 to 3 show an example of the can 1 which is an 18L can (including a variable size can), the basic structure itself is not different from the conventional 18L can, and The manufacturing method (the can making method) is also not particularly limited, and a conventionally known method can be used. However, the present invention is not limited to this, and may be, for example, pails, food cans, beverage cans, and other general cans.

FIG. 1 is a perspective view showing a can. FIG. 2 is a perspective view of the can body as viewed from the bottom side. FIG. 3 is a cross-sectional view showing a part of the can.
The can 1 has a square cylindrical can body 2 whose inside is hollow. A rectangular can lid 3 is joined to both end surfaces of the can barrel 2 so as to close the opening of the can barrel 2. A hand ring 6 and a filling port 7 are provided on one can lid 3 (can lid 3a) (see FIG. 1), and in the present embodiment, the other can lid 3 (can lid 3b) Are positioned on the bottom side of the can 1.

  In addition, depending on the can 1, the shape of the can body 2 is not limited to the square cylinder, and may be a triangular cylinder or another polygonal cylinder. Moreover, when the can 1 is a pail etc., the can body part 2 is cylindrical shape, and the shape of the can lid part 3 joined to this also becomes circular.

As shown in FIG. 3, the member constituting the can lid portion 3 is wound and joined to the member constituting the can body portion 2, and a wound portion 4 is formed. In the tightening portion 4, a member constituting the can lid 3 is exposed to the outer surface.
The tightening portion 4 protrudes in the height direction of the can 1 with respect to the surface 31 formed by the can lid 3 (the can lid 3 b). For this reason, when the can 1 is placed on a flat surface such as the ground with the can lid 3b on the bottom side, the end portion of the winding clamp 4 (the winding clamp when the can 1 is viewed in cross section) The top of 4) is the ground contact portion 5 touching a plane. In other words, a member constituting the can lid 3 in the winding tightening unit 4, that is, a part of the can lid 3 (can lid 3 b) is the ground contact 5.

  In the can 1 which has the said structure, the member which comprises the can trunk | drum 2 is a lamination steel plate, and the member which comprises the can lid part 3 is also a lamination steel plate. In the members constituting the can body 2 and the can lid 3, the laminate is coated at least on the surface to be the outer surface of the can 1, and the presence or absence of the coating on the surface to be the inner surface is not particularly limited.

As described above, in the tightening portion 4, the member constituting the can lid 3 is exposed to the outer surface. For this reason, in the can 1 in which the member which comprises the can cover part 3 is a laminated steel plate, the laminate is exposed to the outer surface. That is, in the ground portion 5, the laminate is in direct contact with the ground or the like.
In such a can 1, since the member constituting the can lid 3 is a laminated steel plate, the resistance to rust or the like that may occur in the can lid 3, particularly, the ground 5 is good, and the corrosion resistance is excellent.

However, since the laminate is in direct contact with the ground or the like at the ground contact portion 5, a problem may occur in the slip resistance of the can 1.
Therefore, in the present invention, the dynamic friction coefficient of the can 1 is made 0.27 or more by applying anti-slip coating (not shown) to at least the ground portion 5. This shows sufficient slip resistance which does not produce a delay by conveyance by a general roll conveyor. This is also apparent from the results shown in the below-described Examples.

<Dynamic friction coefficient>
The dynamic friction coefficient of the can 1 is not particularly limited as long as it is 0.27 or more, but is preferably 0.30 or more because the slip resistance is more excellent. If the dynamic friction coefficient is 0.30 or more, the same or higher slip resistance as in the case of using a coated steel plate as a member constituting the can lid 3 (a part of which becomes the ground contact 5) can be obtained.

  On the other hand, the upper limit value of the dynamic friction coefficient of the can 1 is not particularly limited and can be increased as necessary, but depending on the use environment, there may be a problem of being too slippery. 50 or less are mentioned and 0.40 or less is preferable.

In the present invention, the dynamic friction coefficient of the can 1 is a dynamic friction coefficient measured by bringing the ground portion 5 into contact with the surface made of the member constituting the can lid 3, and the members constituting the can lid 3 It is a dynamic friction coefficient when the can 1 is slid on the slope produced by above.
At this time, in the surface to be produced (sloped surface), when the member constituting the can lid portion 3 is a member laminated on only one side (painted in Comparative Example 1 described later), this laminated surface (painted surface) It goes without saying that the surface of the can 1 is in contact with the ground 5 of the can 1.
A more detailed measurement method of the dynamic friction coefficient will be described in [Examples] described later.

<Laminated steel plate>
The laminated steel plate is composed of a steel plate and a laminated film coated on at least one side of the steel plate.
It does not specifically limit as a steel plate used as a board | substrate of a laminated steel plate, A conventionally well-known steel plate can be used suitably according to a use. For example, a surface-treated steel sheet in which the surface of the steel sheet is subjected to various surface treatments may be mentioned. Among them, a surface-treated steel sheet (so-called TFS) or the like on which a two-layer film in which the lower layer is chromium and the upper layer is chromium hydroxide. Is preferably mentioned, but not limited thereto.
Moreover, as a steel plate to be laminated, a conventional coated material (painted steel plate), a bare iron material or the like may be used.
The thickness of the steel plate as the substrate is not particularly limited, and various thicknesses can be selected according to the application of the can. As a plate thickness which comprises a general can, although about 0.15-0.60 mm is mentioned, it goes without saying that these ranges are suitable.

The resin type of the laminate film is not particularly limited. For example, polyethylene terephthalate (PET), polypropylene (PP), polybutylene terephthalate (PBT), polyethylene terephthalate-polybutylene terephthalate copolymer (PET-PBT), polyethylene terephthalate -Polyethylene isophthalate copolymer (PET-PEI), polyethylene terephthalate-polyethylene isophthalate-polybutylene terephthalate copolymer (PET-PEI-PBT), etc. may be mentioned.
In the present invention, since the anti-slip coating is applied on the laminate film, the thickness of the laminate film is not particularly limited, and can be determined by other performance required as a can. As a film thickness of a lamination film in a lamination steel plate which constitutes a general can, although about 10-100 micrometers are mentioned, it is needless to say that these ranges are suitable.
In addition, the coating method of the laminated film with respect to a steel plate is not specifically limited, either, For example, it can carry out using conventionally well-known methods, such as a thermocompression-bonding method and a melt extrusion method.

<Slip and paint>
The paint used for anti-slip coating applied to the ground portion 5 of the can 1 (hereinafter, also referred to as "non-slip paint") is not particularly limited as long as the dynamic friction coefficient of the can is 0.27 or more However, when considering the workability of coating only on the ground portion after forming the can, as a non-slip coating, for example, one-component room temperature drying including a resin such as an oxidation polymerization alkyd resin or a styrenated alkyd resin Paints: One-component baking coatings containing resins such as melamine-modified alkyd resins; Two-component normal temperature drying paints such as epoxy resin-polyamide resin system, polyester polyol resin-isocyanate system;
In addition, the solvent in a non-slip coating material is not specifically limited, either, It selects suitably.

Moreover, it is preferable that the anti-slip coating further contains an anti-slip component, for example, using the above-mentioned resin as a base resin. Examples of the non-slip component include rosins, tar and the like, and rosins are preferable because they have better anti-slip properties.
The content of the non-slip component is, for example, 3 to 20% by mass in terms of solid content with respect to 100 parts by mass of the total solid content in the paint. However, the effect of slip resistance is saturated even if the amount of the non-slip component is too large, from the viewpoint of cost, 3 to 10% by mass is preferable, and 5 to 10 mass because slip resistance becomes better. % Is more preferable, and 7 to 10% by mass is further preferable.

Although the application method of a non-slip coating material is not specifically limited, For example, the method of apply | coating to the earthing | grounding part 5 in the can 1 after can-making is mentioned using a roll coater, a stamp, etc. Thereafter, depending on the paint, room temperature drying or baking is performed.
In normal temperature drying, not only natural drying but also drying may be performed using a dryer or the like.
In the heat treatment for baking, the temperature is raised to a desired ultimate temperature. The ultimate temperature (maximum temperature increase value) and the treatment time are appropriately selected according to the paint.

  In addition, as the non-slip coating, the coating method is not limited as long as the coefficient of dynamic friction is a predetermined value, and in addition to the coating using the paint, for example, the powder coating using PP powder, PE powder, etc. It may be. After powder coating, bake if necessary.

  The non-slip coating may also serve as a repair coating applied to the winding clamp 4.

<Other aspects>
Although the example mentioned above provided the grounding part 5 which gave anti-slip coating only to one can lid part 3b was explained, the present invention is not limited to this.
For example, when the side of the other can lid 3a is to be grounded, the crimped portion 4 of the can lid 3a may be a ground 5 and the ground 5 may be non-slip coated.
Alternatively, both the ground portions 5 may be non-slip coated by using the winding clamps 4 in both the can lids 3 (the can lid 3 a and the can lid 3 b) as the ground portions 5. By providing the ground portions 5 to which anti-slip coating is applied on both sides of the can 1, the can 1 falls off when being transported using a forklift or the like in a state where the cans 1 are stacked in multiple stages. Can be prevented more effectively.

  Hereinafter, the present invention will be specifically described by way of examples. However, the present invention is not limited to these.

<Invention Examples 1 to 8 and Comparative Examples 1 to 6>
First, laminated steel plates were produced as members used for cans of the invention examples and comparative examples.
Specifically, after applying TFS plating (chromium plating) to a cold-rolled steel plate (refining degree T2CA, 0.32 mm thickness), a polyethylene terephthalate film (15 μm thickness) is only applied to the outer surface of the can body. It coat | covered with the thermocompression-bonding method, and produced the laminated steel plate (it also describes as a "PET laminated steel plate" hereafter). Similarly, a laminated steel plate coated with a polypropylene film (70 μm thick) (hereinafter also referred to as “PP laminated steel plate”), and a laminated steel plate coated with a polyethylene terephthalate-polybutylene terephthalate copolymer film (15 μm thick) , "PET-PBT laminated steel plate" is also produced.
Moreover, a varnish coated steel plate was produced as one of the members used for a comparative example. Specifically, varnish coating was applied to the whole of the plated steel plate obtained by applying TFS plating (chrome plating) to a cold rolled steel plate (refining degree T2CA, 0.32 mm thickness). The varnish coating performed baking on condition of 160 degreeC x 10 minutes using "F05TKN-1" by Toyo Ink Co., Ltd. product.

  Next, using the laminated steel plate or varnished steel plate shown in Table 1 below as a member of the can body portion and the can lid portion, the same can (18 L) as the can 1 described based on FIGS. 1 to 3 Made a can).

  Next, with respect to the grounding portion (grounding portion 5 in FIGS. 1 to 3) which is a part of the can lid portion on the opposite side to the can lid portion provided with the hand ring and the filling port in the can made Of the paints A to G described later, the paints shown in Table 1 below were used for coating (non-slip coating). However, in Comparative Examples 1 to 3, painting was not performed.

Here, the details of the paints A to G used in each example are described below. In addition, the quantity of the addition component in each paint is solid content (unit: mass%) when the total solid in paint is 100 mass%. In addition, paint conditions are also described.
For coating of paints A to E and G, a general powder coating apparatus was used for coating of paint F, using a roll coater (“ACSTK-45” manufactured by NPW Giken Co., Ltd.).

(Paint A)
Base resin: Oxidized polymerization type alkyd (“SK-7001” manufactured by Taiwan Sakuramiya Chemical Co., Ltd.)
Additives: 7% by weight of pine resin
-Painting conditions: normal temperature drying

(Paint B)
Base resin: styrenated alkyd ("SK-8000" manufactured by Taiwan Sakuramiya Chemical Co., Ltd.)
Additives: 7% by weight of pine resin
-Painting conditions: normal temperature drying

(Paint C)
Base resin: melamine modified alkyd (Taiwan Sakuramiya Chemical Co., Ltd. "TS-5623")
Additives: 7% by weight of pine resin
・ Coating condition: Achieved temperature 180 ° C

(Paint D)
Base resin: Oxidized polymerization type alkyd (“SK-7001” manufactured by Taiwan Sakuramiya Chemical Co., Ltd.)
Additive ingredient: 3% by mass of pine resin
-Painting conditions: normal temperature drying

(Paint E)
Base resin: Oxidized polymerization type alkyd (“SK-7001” manufactured by Taiwan Sakuramiya Chemical Co., Ltd.)
Additives: 5% by weight of tar
-Painting conditions: normal temperature drying

(Paint F)
Base resin: PE powder coating ("NS101" manufactured by Mitsui Chemicals, Inc.)
・ Additional ingredient: None ・ Painting condition: Achieved temperature 190 ° C

(Paint G)
Base resin: Oxidized polymerization type alkyd (“SK-7001” manufactured by Taiwan Sakuramiya Chemical Co., Ltd.)
Additives: None Coating conditions: normal temperature drying

<Measurement of dynamic coefficient of friction>
FIG. 4 is a schematic view showing a test method for measuring the dynamic friction coefficient of the can body.
The dynamic friction coefficient of the can of each example was measured as follows. First, a flat inclined surface of 25 ° was prepared, and the same member as the member used for the can (laminated steel plate or varnished steel plate) was attached to the surface of the inclined surface. At this time, the laminated surface or the varnish-coated surface was on the top side to be in contact with the can. A ground contact portion (non-slip coating in Comparative Examples 1 to 3) applied with anti-slip coating is brought into contact with the inclined surface to which the above member is attached, and the can is slid on this inclined surface to slide a predetermined distance. The time was measured, and the dynamic friction coefficient was determined by the calculation described below.

Force acting on can F = ma = mg sinθ-μmg cosθ
A a = g (sin θ-μ cos θ) (1)
Acceleration a = (V−V ₀ ) / t = V / t (2)
From equations (1) and (2), V = tg (sin θ−μ cos θ) (3)
Energy balance mgL sinθ = (1/2) mV ² + Lμmg cosθ
... (4)
From equation (4), V ² = ² g L (sin θ−μ cos θ) (5)
From equations (3) and (5), μ = tan θ- ² L / (t ² g cos θ) (6)
From equation (6), 2L = gt ² (sin θ-μ cos θ) (7)
Since the relational expression at the time of sliding the distance L ₁ can be considered in the same manner as (7),
From equation (7), 2L ₁ = gt ₁ ² (sin θ−μcos θ) (8)
Equation (7) and (8) than ^{_{2L 1 / 2L = gt 1 2}} (sinθ-μcosθ) / gt 2 (sinθ-μcosθ)
L ₁ / L = t ₁ ² / t ² (9)
From equation (9), t ₁ = t√ (L ₁ / L) (10)
Since the time determined by the experiment is t-t ₁ = T _E ,
From equation (10), t−t ₁ = t (1−√ (L ₁ / L)) = T _E
Therefore, according to the equation (6), μ = tan θ-2L / ((T _E ² ) ((L + LL (LL ₁ )) ² / (L−L ₁ ) ² ) g cos θ) (11)
In the case of L = 1.25, L ₁ = 0.25 and θ = 25 °, the following equation is obtained.
^{_{μ = 0.4663-0.0860 / T E 2 ...}} (12)
In each example, T _E was measured, and the dynamic friction coefficient μ was determined from equation (12).

In the above formulas, each symbol indicates the following contents.
m: mass of the can a: acceleration of the can g: gravitational acceleration (= 9.80665 m / s ² )
θ: Inclination angle (= 25 °)
L: Travel distance (= 1.25 m)
L ₁ : Movement distance (= 0.25 m)
t: 1.25 m travel time t ₁ : 0.25 m travel time T _E : Time to be measured V ₀ : Initial speed (= 0 m / s)
V: Speed after moving 1.25 m μ: Dynamic coefficient of friction

<Evaluation>
The slip resistance and the corrosion resistance were evaluated for the cans of each example as follows. The results are shown in Table 1 below.

(Evaluation of slip resistance)
The prepared can body is placed on an iron roll conveyor with the ground portion (non-slip coating in Comparative Examples 1 to 3) with non-slip coating on the lower side and transported (metal roll: 35 mmφ, transport speed: 20 m / Min, conveyance distance: 5 m), and the presence or absence of conveyance delay of the cans was investigated. The conveyance delay of the can results from the can sliding on the conveyance roll (ie, the conveyance roll slips).
Generally, since metal roll conveyors are used in horizontal lines, tests were conducted in horizontal lines, and tests were also performed in inclined lines with an inclination angle of 10 ° as more severe conditions. In each case, 10 cans were tested, and the results are shown based on the following criteria. If a result is "(circle)" or "(double-circle)", it can be evaluated as what is excellent in slip resistance.
"X": The conveyance delay occurred in any of the horizontal line and the inclined line.
・ "O": There was no transport delay in the horizontal line, but a transport delay occurred in the inclined line.
"◎": No conveyance delay occurred in any of the horizontal line and the inclined line.

(Evaluation of corrosion resistance)
The corrosion of the ground portion is caused, for example, by the destruction of the coating layer during transportation and the exposure of the base steel plate. Therefore, the corrosion resistance was evaluated as follows.
First, five stages of cans were stacked and transported 500 km at an average speed of 35 km per hour by truck. After that, take out the middle-stage (third-stage) can and apply the copper sulfate test solution, which is an aqueous solution of copper sulfate (0.8 mol / L) and hydrochloric acid (1.2 mol / L), to the ground part of the can. I painted it. It was visually confirmed whether or not there was substitution precipitation of Cu, and the results were shown based on the following criteria. If a result is "(circle)", it can evaluate as what is excellent in corrosion resistance.
-"X": substitution precipitation of Cu is present "○": substitution precipitation of Cu is not present

As is clear from the results shown in Table 1 above, all of the cans of Invention Examples 1 to 8 of the invention examples 1 to 8 use laminated steel plates as members of the can lid and have a dynamic friction coefficient of 0.27 or more. Corrosion resistance and slip resistance were excellent.
In particular, the cans of the invention examples 1 to 5 and 8 having the dynamic friction coefficient of 0.30 or more have a dynamic friction coefficient of 0.27 or more and less than 0.30, compared with the cans of the invention examples 6 and 7 The slip resistance was better.

  On the other hand, the can of the comparative example 1 which did not use a laminated steel plate as a member of a can lid part had inferior corrosion resistance. Moreover, the can of Comparative Examples 2-6 whose dynamic friction coefficient is less than 0.27 was inferior in the slip resistance.

1: Can body 2: Can body 3, 3a, 3b: Can lid 31: Face 4: Winding portion 5: Grounding portion 6: Hand ring 7: Filler

Claims (7)

A can body comprising: a can body having a cylindrical or rectangular shape; and a can lid joined to both end faces of the can body,
The member constituting the can lid is a laminated steel plate,
A part of at least one of the can lids is a ground contact portion, and the ground contact portion is provided with a non-slip coating,
The can which the dynamic friction coefficient measured by making the said earthing | grounding part be earthed | grounded to the surface produced with the member which comprises the said can cover part is 0.27 or more.
However, the dynamic friction coefficient is measured as follows. First, prepare a flat slope of 25 °. The laminated steel plate is attached to the surface of the inclined surface, with the laminating surface on the top side. The ground contact portion of the can body on which the anti-slip coating is applied is brought into contact with the inclined surface to which the laminated steel plate is attached. The coefficient of dynamic friction is determined by sliding the can body on the inclined surface to which the laminated steel plate is attached and measuring the time of sliding a predetermined distance.   The can according to claim 1, wherein the dynamic friction coefficient is 0.30 or more.   The can according to claim 1 or 2 which has said grounding part by which said non-slip coating was given to both said can lids. The paint used for the anti-slip coating contains an anti-slip component,
The can according to any one of claims 1 to 3, wherein the solid content of the anti-slip component is 3 to 10% by mass with respect to 100% by mass of the total solid content in the paint.   The can according to claim 4, wherein the non-slip component is rosin.   The can according to any one of claims 1 to 5, which is at least one of an 18L can and a variable-sized can. It is a manufacturing method of a can which manufactures a can according to any one of claims 1 to 6,
Preparing a can having the can barrel and the can lid;
Applying the anti-slip coating to the ground contact portion which is a part of the can lid portion of the prepared can body.