JP3129885U - Metal plate for can manufacturing - Google Patents

Abstract

[PROBLEMS] To make it possible to avoid enamel hair from peeling off a coating film on a metal plate during curling of the metal plate, and to dispel the conventional customer discomfort due to the enamel hair remaining in the can. A metal plate for cans is provided.
An end edge part of a can-making metal plate 5 in which an end edge part of a can-making container having an outer surface coated with a coating film 2 is bent in a curl shape inward. A plurality of cuts 6 are continuously formed at predetermined intervals along the edge portion, perpendicular to the edge portion.
[Selection] Figure 2

Description

  The present invention relates to an edge structure of a metal plate for can making that can prevent enamel hair from being generated from a curled portion of the edge portion of the metal plate in a curling process during can making.

  Conventionally, a confectionery case or the like formed of a metal plate has been widely used. In this confectionery case or the like, a pattern made of a coating material such as a thermoplastic resin is applied or printed on the surface of the can body or can lid. The coating film of this pattern is extremely important for enhancing the merchantability of confectionery and the like stored in the case, and enhancing the corrosion resistance and decorativeness of the can (see, for example, Patent Document 1).

By the way, generally this confectionery case etc. are manufactured in the following procedures. The outline of this manufacturing procedure will be described with reference to FIGS.
In manufacturing the confectionery case or the like, first, a flat metal plate 1 is prepared in order to form a can body part. FIG. 3 is a plan view showing the metal plate 1, and for example, a tin plate that can be easily machined is used.

  Further, as shown in FIG. 4, a pattern using a paint such as a thermoplastic resin is formed on the surface (usually one side) of the metal plate 1 by coating or printing (printing process). The pattern is printed on the metal plate 1 by dividing the pattern having the same pattern into, for example, ten strip-like regions a to j.

  Next, the metal plate 1 on which the pattern of the same pattern is applied is cut one by one for each of the belt-like regions a to j to obtain a total of ten belt-like bodies (metal plates for can making) (cutting process). ). FIG. 5 shows one (region a) strip 3 of these ten sheets.

  Subsequently, one end edge portion (upper end edge portion in the drawing) of the flat belt-like body 3 as shown in FIG. 5 is shown in FIG. 6 with a predetermined width H, here, 1.5 to 2.0 mm. To curl as shown. In this curling process, it is bent into an arc shape along the winding roll in the subsequent process (curling process).

After this curling step, the left and right edge portions of the belt-like body 3 are wound around each other and further welded to the wound portion 3a to form a can body portion 4 as shown in FIG. Further, the upper end opening edge of the can body part 4 is wound inward so as not to be injured even when touched by a hand, and the lower opening edge is double-rolled together with the peripheral edge of the separately prepared bottom plate. Thereby, a series of processes of confectionery case manufacture is completed.
JP-A-5-132061

  However, in the curling process at the time of such conventional can making, the curled portion of the metal plate which is the band 3 is subjected to concentrated stress by strongly pressing a processing tool such as a roll against the surface of the edge of the band 3. I will receive it. For this reason, a part of the coating film is peeled off centering on the portion hit by the processing tool, and this becomes paint waste called enamel hair (angel hair) and is scattered in the vicinity. This enamel hair forms a thin hair, is electrostatically attached to the inner surface of the can body, and remains in the can as it is.

  Therefore, when confectionery or food is stored in the can thus manufactured and sold, the enamel hair remaining in the can is like hair on the customer who has purchased it. There was a problem of being overlooked and giving a sense of filth or sanitation.

  The present invention has been made to solve the conventional problems as described above, and it is possible to avoid the enamel hair from peeling off the coating film on the metal plate during curling of the metal plate. It is an object of the present invention to provide a metal plate for can making that can eliminate the conventional customer discomfort due to the hair remaining in the can.

  To achieve the above object, a metal plate for can manufacturing according to the present invention is a metal plate for can manufacturing, wherein a coating film is applied to a surface, and an edge is bent into a curled shape, A plurality of cuts are provided at predetermined intervals on the edge portion that is a surface side to which a coating film is applied and is bent into a curled shape.

  With this configuration, when the edge portion is bent into a curl shape with the processing tool facing the edge portion of the can-making container inward, the processing stress generated in the curled portion is absorbed by distortion deformation of the cut portion. Is done. Therefore, the coating film on the surface of the metal plate in the curled portion is not peeled off, and the occurrence of the enamel hair can be avoided in advance. Therefore, it is possible to wipe away the unclean feeling and unsanitary feeling of the stored product due to the enamel hair remaining in the can, and the reliability of the customer's product is improved.

The metal plate for can making according to the present invention is characterized in that the cuts are arranged at intervals of 0.5 to 2.0.
According to this configuration, even when the hardness of the coating film is relatively high or the thickness of the coating film is large, the generation of enamel hair during the bending process can be more reliably prevented.

  According to the present invention, it is possible to prevent the coating film on the metal plate from being peeled off during the curling process of the metal plate, resulting in an enamel hair, and the conventional customer discomfort and unsanitary due to the enamel hair remaining in the can. The effect that a feeling can be wiped off is acquired.

Embodiments of the present invention will be described below with reference to the drawings.
The present invention is an edge structure of a metal plate for can making, wherein the edge of a can-making container having a coating film on the outer surface is bent in a curl shape toward the inside. A plurality of cuts are continuously formed at predetermined intervals along the portion perpendicular to the edge portion.

  By adopting such a configuration, when the end edge portion is bent into a curled shape, even if the curled portion is subjected to processing stress intensively, it is concentrated on the curled portion due to distortion deformation of the cut portion. To relieve stress. Therefore, peeling of the coating film on the surface of the metal plate at the edge portion can be avoided, and generation of enamel hair due to the peeling of the coating film can be avoided beforehand. As a result, the unclean feeling and unsanitary feeling of the stored product due to the remaining in the can of this enamel hair can be eliminated, and the reliability of the customer's product can be improved.

  FIG. 1 is a plan view showing a strip-shaped metal plate 5 for can making according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA in FIG. This can metal plate 5 is similar to the one shown in FIG. 3, and the one shown in FIG. 5 is a surface of the metal plate 1, such as tinplate, with a paint film 2, that is, a pattern printed by coating or the like. In the same manner as described above, a band-shaped body obtained by cutting into a band is formed.

  Moreover, it is an edge part (upper edge part on the figure) of the surface side (the side with a pattern) of this metal plate (band | belt-shaped body) 5 for cans, Comprising: It is 1 from the edge part in a curl process site | part. In the region H of .5 to 2.0 mm, a plurality of cuts 6 are made along the edge portion, at a predetermined interval Q, perpendicular to the edge portion. As shown in FIG. 2, the notch 6 is formed to a depth applied to the surfaces of the coating film 2 and the metal plate 1.

  For this reason, when the region H of the band-shaped metal plate 5 having such a cut 6 is subjected to curling similarly to the case described with reference to FIG. 6 using a processing roll for curling, the metal plate The force acting on the coating film 2 is divided (that is, absorbed) by the notch 6 due to local distortion of the portion including the region H of 5. Therefore, an unreasonable peeling force does not directly act on the coating film of the curled portion, and the generation of enamel hair can be surely avoided.

  As a result, a can body portion substantially the same as that shown in FIG. 7 is formed using the strip-shaped metal plate 5, the upper end opening is tightened, the lower end opening and the peripheral portion of the separately prepared bottom plate are Thus, it is possible to reliably prevent enamel hair that has been produced in the past or adhere to a can produced by double winding. Therefore, when this can is used as a packaging case for confectionery or food, it is completely impossible to give the customer a sense of filth and sanitation due to enamel hair.

  As mentioned above, in this embodiment, the edge part of the metal plate 5 for can manufacturing in which the edge part of the can manufacturing container which gave the coating film 2 to the outer surface is bent in a curl shape toward the inner side. A plurality of cuts 6 are continuously formed at predetermined intervals along the end edge portion so as to be perpendicular to the end edge portion, and the end edge portion is bent into a curl shape by a processing tool. At this time, the notch 6 absorbs the distortion force generated at the edge portion.

  Therefore, the coating film on the surface of the metal plate at the edge is not peeled off, and generation of enamel hair can be avoided in advance. As a result, it is possible to wipe away all the unclean and unsanitary sensations of products due to enamel hair remaining in the can, and the reliability of the customer's products can be improved.

  The present invention can prevent the coating film on the metal plate from being peeled off during the curling process of the metal plate, resulting in enamel hair, and the customer's discomfort and unsanitary feeling due to the residual enamel hair in the can. It has an effect that it can be wiped off, and is useful for a metal plate for can making that prevents enamel hair from being generated from the curled part in the curling process of the can.

It is a top view which shows the metal plate for can manufacturing by embodiment of this invention. It is the sectional view on the AA line of the metal plate for cans shown in FIG. It is a top view which shows the metal plate as a raw material for can manufacturing. It is a BB sectional view of the metal plate shown in FIG. It is a top view of the strip | belt-shaped metal plate for cans cut from the metal plate shown in FIG. It is sectional drawing of the state which curled the edge part of the metal plate for cans shown in FIG. It is a perspective view of the can trunk | drum formed using the metal plate for cans shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Metal plate 2 ... Coating film 5 ... Metal plate for can manufacturing 6 ... Cutting

Claims (2)

It is an edge part structure of a metal plate for can making that is bent into a curl shape with the edge part of the can making container formed with a coating film on the outer surface facing inward,
An edge structure of a metal plate for can making, wherein a plurality of cuts are continuously formed at predetermined intervals along the edge, perpendicular to the edge.   The edge structure of the metal plate for can manufacturing according to claim 1, wherein the cuts are arranged at intervals of 0.5 to 2.0.

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