JP7088566B2 - How to make a container - Google Patents

Description

The present invention relates to a method for manufacturing a container made of synthetic resin having a window portion so that the inside of the container can be visually recognized.

Synthetic resin is inexpensive, lightweight, and has excellent moldability, and is widely used as a container for various articles regardless of whether it is a solid or a liquid. For this reason, various methods for painting and decorating these synthetic resin containers have been put into practical use. For example, in a cosmetic container or the like, in order to enhance the appearance of luxury, a decorative method in which a glossy metal film is deposited on the surface and further painting or printing is performed on the vapor film is also common. However, when a metal film is deposited on the entire surface of the container, the transparency of the container is lost even if the container body is transparent or translucent, and the inside of the container cannot be visually recognized. Therefore, the formed metal film is partially removed to provide a window portion in which the inside of the container can be visually recognized. For example, the following [Patent Document 1] describes a method of forming a metal film and irradiating a laser beam after coating to remove a coating film and a metal film of a specific portion to form a window portion. However, when the metal film is removed by the laser beam, the metal film at the boundary of the removed portion (window portion) may be denatured and peeled off by the heat of the laser beam. Therefore, in [Patent Document 1], a clear coat material is applied to the entire container including the window portion to form a protective layer (clear coat layer) to prevent unnecessary peeling and smooth the step of the window portion.

Japanese Patent No. 4863087

When the clear coat material is applied to the entire container as in [Patent Document 1], the application method by spraying is common. However, the application method by spraying is wasteful because the paint (clear coat material) is scattered in a space other than the target container, which increases the material cost and may adversely affect the environment.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a container in which the amount of clear coat material used is minimized.

The present invention
(1) An underlayer forming step S102 for forming an underlayer 30 on the surface of a transparent or translucent synthetic resin container body 10 (10a, 10b, 10c, 10d).
The vapor deposition step S104 for forming the metal film layer 32 on the under layer 30 by thin film deposition,
In the coating step S106 for forming the coating film layer 34 on the metal film layer 32,
The coating film layer 3 is irradiated with laser light.
The laser removing step S108 for forming the window portion 40 by partially removing the 4 and the metal film layer 32 and the under layer 30.
A clear printing step S110 in which a clear coating material is applied to the window portion 40 and its boundary portion using a screen printing method.
By providing a method for manufacturing a container, which comprises a clear coat layer forming step S112 for curing a clear coat material applied in the clear printing step S110 to form a clear coat layer 36, the above-mentioned problem. To solve.
(2) The container bodies 10a, 10b, and 10c are substantially columnar or substantially elliptical columnar, and the window portion 40 is formed on the peripheral surface. The method for manufacturing a container according to (1) above, wherein the clear coat material is applied while rolling the container bodies 10a, 10b, and 10c at a speed equivalent to the moving speed of the moving squeegee 50 or the screen 52. By providing the above problem.
(3) The container bodies 10a, 10b, and 10c are provided with ridges 16 on the inner surface of the mouth portion 14.
The clear printing step S110 provides a holding jig 56 having a groove 58 at the position of the mouth portion 14 of the container body 10a, 10b, 10c, which is substantially the same as the internal shape of the container body 10a, 10b, 10c. By inserting into the 10a, 10b, and 10c and engaging the convex groove 16 with the concave groove 58, the container body 10a, 10b, and 10c are positioned and held, and the holding jig 56 is rotated. The above problem is solved by providing the method for manufacturing a container according to (2) above, which comprises rolling the container bodies 10a, 10b, and 10c.

In the method for manufacturing a container according to the present invention, the clear coat material is applied only to the window portion and the boundary portion thereof by using a screen printing method. Therefore, the amount of the clear coat material used is small as compared with the conventional spray coating method, and the material cost can be reduced. In addition, since the clear coat material does not scatter around, it does not adversely affect the natural environment.

It is a figure which shows the example of the container body which is decorated by this invention. It is a process flowchart of the manufacturing method of the container which concerns on this invention. It is a figure explaining the manufacturing method of the container which concerns on this invention. It is a figure explaining the manufacturing method of the container which concerns on this invention. It is a figure explaining the clear printing process which concerns on this invention. It is a figure explaining the clear printing process which concerns on this invention. It is a figure which shows the example of the container body provided with the window part decorated in this invention.

An embodiment of the method for manufacturing a container according to the present invention will be described with reference to the drawings. First, the container body 10 decorated in the present invention will be described with reference to FIG. The container body 10 (10a, 10b, 10c, 10d) shown in FIG. 1 is made of synthetic resin and has a body portion 12 and a mouth portion 14. Further, as the synthetic resin used for the container body 10, at least a transparent or translucent resin whose insole and the like that move up and down depending on the liquid level of the contents and the amount of the contents can be visually recognized is used. The material of the synthetic resin is not particularly limited as long as it is transparent or translucent, and any material such as polyethylene, polypropylene, and PET (polyethylene terephthalate) may be used. Further, the shape of the container body 10 is not particularly limited, and may be, for example, a vertically long substantially columnar shape as shown in the container body 10a, or a low profile substantially columnar shape as shown in the container body 10b. Further, it may be a substantially elliptical columnar shape as shown in the container body 10c, or may be a substantially square columnar shape as shown in the container body 10d. In particular, in the case of a container body 10 having a substantially cylindrical or substantially elliptical columnar shape, it is preferable to provide a ridge 16 for positioning on the inner surface of the mouth portion 14.

Next, a method for manufacturing a container according to the present invention will be described. Here, FIG. 2 is a process flowchart of the method for manufacturing a container according to the present invention, and FIGS. 3 (A) to 3 (C), FIGS. 4 (A), and (B) are schematically of the main body 12 in each process. It is an enlarged sectional view, and FIGS. 3 (a) to 3 (c), FIGS. 4 (a), and 4 (b) are schematic external views of the container body 10 in each step.

In the method for manufacturing a container according to the present invention, first, as shown in FIG. 3A, an under layer 30 is formed on the surface of the main body portion 12 (under layer forming step S102). As shown in FIGS. 3A to 3C, the under layer 30, the metal film layer 32 described later, and the coating film layer 34 are basically applied to the main body portion 12 and to the mouth portion 14. Not performed. The under layer 30 serves as a base for the metal film layer 32 described later to improve the adhesion of the metal film layer 32, and for example, an acrylic ultraviolet curable resin, a thermosetting resin, or the like is used. Be done. The method of applying the under layer 30 is not particularly limited, but application by spraying is common. Then, the applied under layer 30 is cured by a curing method according to the resin used. This completes the formation of the underlayer 30.

Next, as shown in FIGS. 3 (B) and 3 (b), a metal film layer 32 is formed on the under layer 30 by using a well-known thin-film deposition method (deposition step S104). The metal material used to form the metal film layer 32 is not particularly limited, and various metals and alloys such as aluminum, nickel chromium, and indium, titanium oxide, and oxidation are used depending on the required color of the metal film layer 32 and the like. Any material such as a metal compound such as zinc may be used as long as it can be vapor-deposited.

Next, as shown in FIG. 3C, a coating film layer 34 is formed on the metal film layer 32 (painting step S106). As shown in FIG. 3C, the coating film layer 34 is composed of patterns, characters, etc. of various designs to enhance the decorativeness to the container body 10, and the coating film layer 34 is a metal film layer. It also functions as a protective layer for 32. Further, the method for forming the coating film layer 34 is not particularly limited, and any method such as spraying, screen printing, transfer, or the like may be used. At this time, it is particularly preferable that the substantially columnar container body 10 is positioned by using the ridges 16 so that the window portion 40 and the pattern of the coating film layer 34 formed later do not deviate from each other. Further, the paint forming the coating film layer 34 is not particularly limited, and various paints such as glossy type, semi-glossy type and matte type can be used depending on the required design of the pattern. Further, the pigment to be used is not particularly limited, and a general pigment can be used. Further, the type of the paint is not particularly limited, and any paint such as UV (ultraviolet) curable ink, hot ink, acrylic paint, urethane paint, acrylic / lacquer resin paint may be used.

Next, the laser beam is irradiated to the preset formation position of the window portion 40. The laser beam used is not particularly limited, and a well-known laser such as a YAG laser, a carbon dioxide gas laser, or a semiconductor laser can be used. Then, the under layer 30, the metal film layer 32, and the coating film layer 34 of the irradiated portion are altered by the heat of this laser irradiation, and are peeled off from the main body portion 12 as shown in FIG. 4 (A). At this time, by optimizing the irradiation conditions of the laser beam, it is possible to remove only the under layer 30 to the coating film layer 34 while suppressing damage to the main body portion 12. As a result, the under layer 30 to the coating film layer 34 of the laser beam irradiation portion are partially removed, and the main body portion 12 is exposed. Since the container body 10 is transparent or translucent as described above, the portion from which the under layer 30 to the coating film layer 34 have been removed can be visually recognized inside the container as shown in FIG. 4A. It becomes the window portion 40 (laser removal step S108).

Next, a clear coat material is applied to the window portion 40 and its boundary portion. In particular, in the method for manufacturing a container according to the present invention, the clear coat material is applied by using a screen printing method (clear printing step S110). The clear coat material to be used is not particularly limited and is well known, such as a UV curable resin if screen printing by squeezing is possible, a two-component type clear coat material that cures by mixing a curing agent, and an epoxy-based hot ink. Clear coat material can be used.

Next, the clear printing process S110 will be described in detail with reference to the schematic views of FIGS. 5 and 6. For convenience of explanation, in FIGS. 5 and 6 (b), the window portion 40 (which is originally hidden by the coating film layer or the like) is illustrated by a recess. First, the screen printing device used here has a screen 52, a squeegee 50 located on the screen 52, and holding portions 54, 54a for holding the container body 10 below the screen 52. Further, the screen printing device has a slide mechanism for sliding the squeegee 50 or the screen 52. A mesh opening 52a having substantially the same dimensions and shape as the window 40 is formed at a predetermined position on the screen 52. The mesh of the screen 52 varies depending on the type and viscosity of the clear coat material used, the shape of the container body 10 for printing, and the like, but it is generally preferable to use a mesh of 200 mesh to 300 mesh of tetron or nylon. ..

Next, an example of a method of applying the clear coat material to the substantially prismatic container body 10d will be described with reference to FIG. 5 (a). First, the substantially prismatic container body 10d is set in the holding portion 54 so that the window portion 40 is on the screen 52 side. Next, the positions of the holding portion 54 or the screen 52 are adjusted so that the positions of the window portion 40 and the mesh opening portion 52a are aligned with each other. At this time, the clear coat material may be actually printed to confirm the position and make fine adjustments. Next, an appropriate amount of the clear coat material C is placed on the screen 52, and the squeegee 50 is operated. In a general screen printing device, a scraper (not shown) that moves with the squeegee 50 applies a clear coat material on the screen 52 on the outward trip to an appropriate thickness, and the squeegee 50 presses the screen 52 appropriately on the return trip to the screen. Skiing is performed while the 52 and the printed surface of the container body 10 are in contact with each other. As a result, the clear coat material C of the mesh opening 52a is extruded from the mesh opening 52a and applied to the window 40 of the container body 10d and its boundary portion.

Next, an example of a method of applying the clear coat material to the substantially cylindrical and substantially elliptical columnar container bodies 10a to 10c will be described with reference to FIG. 5B using the substantially elliptical columnar container body 10c. When the clear coat material is printed and applied to the peripheral surfaces of the container bodies 10a to 10c which are curved surfaces, the (horizontal) position of the squeegee 50 is fixed as shown in FIGS. 5 (b) and 6 (b). It is preferable to slide the screen 52 to perform printing.

In the application of the clear coat material to the substantially cylindrical and substantially elliptical columnar container bodies 10a to 10c, the container bodies 10a to 10c are held so that the axial direction of the container bodies 10a to 10c is perpendicular to the moving direction of the screen 52. Install at 54a. At this time, particularly in the substantially cylindrical container bodies 10a and 10b, by performing positioning using the ridges 16, the window portion 40 can be installed so as to always face the screen 52 side in a constant direction. The holding portion 54a is provided with a rotation mechanism for rolling the container bodies 10a to 10c. Next, the position of the screen 52 is adjusted so that the position of one edge of the window portion 40 of the container bodies 10a to 10c coincides with the position of one edge of the mesh opening 52a. At this time, the squeegee 50 is in a standby position above the mesh opening 52a. Next, an appropriate amount of the clear coat material C is placed on the screen 52, and the screen printing device is operated. As a result, the holding portion 54a rises toward the screen 52 together with the container bodies 10a to 10c, and the squeegee 50 descends toward the screen 52. Then, the screen 52 is sandwiched from above and below with a predetermined pressure. Next, the screen printing device slides and moves the screen 52, and the holding portion 54a rolls the container bodies 10a to 10c in the same direction as the moving direction of the screen 52 at a rotation speed substantially equal to the moving speed of the screen 52. .. As a result, the clear coat material C is applied to the window portions 40 and the boundary portions thereof of the container bodies 10a to 10c through the mesh opening 52a. When the application of the clear coat material to the container bodies 10a to 10c is completed in this way, the holding portion 54a descends together with the container bodies 10a to 10c, and the squeegee 50 rises to the standby position. Further, the screen 52 moves to the position before coating. Then, the next container bodies 10a to 10c are in a standby state for printing and coating.

When the bottom of the substantially cylindrical container bodies 10a and 10b is a separate body, the clear coat material is applied as follows using the holding jig 56 shown in FIG. 6 (a). It is preferable to do. Note that FIG. 6 illustrates an example of a vertically long, substantially cylindrical container body 10a. First, the holding jig 56 shown in FIG. 6A has a shape substantially equivalent to the internal shape of the container bodies 10a and 10b, and is substantially the inner diameter of the mouth portion 14 of the container bodies 10a and 10b on the front side. It has a positioning end 56a of the same diameter. A concave groove 58 that engages with the ridge 16 of the mouth portion 14 is provided on the peripheral surface of the positioning end 56a.

Then, in the container bodies 10a and 10b having a separate bottom portion, the under layer 30 to the coating film layer 34 are formed without the bottom portion, and the window portion 40 is formed by the laser beam. Then, the holding jig 56 is inserted from the bottom side of the container main body 10a and 10b, and the ridge 16 of the mouth portion 14 of the container main body 10a and 10b engages with the concave groove 58 of the positioning end 56a of the holding jig 56. .. As a result, the container bodies 10a and 10b roll together with the holding jig 56. Then, the holding jig 56 is fixed to the holding portion 54a of the screen printing device. The fixing direction of the holding jig 56 to the holding portion 54a is fixed, and by fixing the holding jig 56 to the holding portion 54a, the window portion 40 of the container main body 10a and 10b is automatically set to the predetermined position on the screen 52 side. Turn to the direction of. Then, as shown in FIG. 6B, after aligning the position of one edge of the window portion 40 of the container body 10a and 10b with the position of one edge of the mesh opening 52a, a clear coat is applied on the screen 52. An appropriate amount of material C is placed and the screen printing device is operated. As a result, the holding portion 54a rises toward the screen 52 together with the container bodies 10a and 10b, and the squeegee 50 descends toward the screen 52. Then, the screen 52 is sandwiched from above and below with a predetermined pressure. Next, the screen printing device slides and moves the screen 52, and the holding portion 54a rolls the container bodies 10a and 10b in the same direction as the moving direction of the screen 52 at a rotation speed substantially equal to the moving speed of the screen 52. .. As a result, the clear coat material C is applied to the window portions 40 and the boundary portions thereof of the container bodies 10a to 10c through the mesh opening 52a. When the application of the clear coat material to the container bodies 10a and 10b is completed in this way, the holding portion 54a descends together with the container bodies 10a and 10b, and the squeegee 50 rises to the standby position. Further, the screen 52 moves to the position before coating. Then, the next container bodies 10a and 10b are in a standby state for printing and coating. In the configuration using the holding jig 56, since the container bodies 10a and 10b are supported from the inside by the holding jig 56, the stability at the time of rolling is good and the clear coat material can be printed and applied with high accuracy. It can be carried out.

When the clear coat material is applied to the window portion 40 of the container body 10 in this way, the applied clear coat material is then cured. This curing method differs depending on the clear coat material used. For example, if the clear coat material is an ultraviolet curable resin, UV (ultraviolet) irradiation is performed. Further, in the case of a two-component type in which the clear coat material is cured by mixing with a curing agent, it is cured after a predetermined reaction time elapses. In the case of hot ink, it is cured by heating it to a predetermined temperature. (Clear coat layer forming step S112). As a result, as shown in FIGS. 4B and 4B, the clear coat layer 36 is formed so as to cover the window portion 40 and its boundary portion (cut surface). As a result, the boundary portion (cut surface) of the under layer 30, the metal film layer 32, and the coating film layer 34 removed by laser irradiation is protected by the clear coat layer 36, and further peeling and damage are prevented. Further, the fine rough surface state of the window portion 40 generated by the laser irradiation is smoothed, and the internal visibility of the window portion 40 is improved. As a result, as shown in FIG. 7, painting of the container bodies 10a to 10d provided with the window portion 40 is completed.

After the container body 10 that has been painted is filled with the content liquid, it is completed by fixing a well-known discharge means such as a sprayer or a dispenser to the mouth portion 14. Further, in the container body 10 having a separate bottom, for example, after inserting an insole that moves up and down according to the amount of the content liquid, the bottom is fixed to the container body 10. Then, after filling the content liquid in the same manner, the discharge means is fixed to the mouth portion 14 to complete the process.

As described above, in the method for manufacturing a container according to the present invention, the clear coat material is applied only to the window portion 40 and its boundary portion by using a screen printing method. Therefore, the amount of the clear coat material used is reduced to 1/200 to 1/2300 as compared with the conventional method of applying the clear coat material to the entire surface of the container body by spraying, and the material cost can be reduced. In addition, the screen printing method can be manufactured in small lots, and can be used for small-lot, high-mix manufacturing at low cost. Further, in the conventional method of applying the clear coat material by spraying, the atomized clear coat material may be scattered and adversely affect the environment. However, in the container manufacturing method according to the present invention, since the coating is performed by using the screen printing method, the clear coat material does not scatter and can contribute to the conservation of the natural environment.

It should be noted that each process of the container manufacturing method shown in this example, the member used, the device used, the screen printing device, and the mechanism, structure, conditions, etc. of the holding portions 54, 54a are examples, and are not limited thereto. However, the present invention can be modified and implemented without departing from the gist of the present invention.

10 (10a, 10b, 10c, 10d) Container body
14 mouth
16 Convex
30 under layer
32 Metal film layer
34 Coating film layer
36 clear coat layer
40 Window
50 squeegee
52 screen
56 Holding jig
58 concave groove
S102 Under layer forming step
S104 thin-film deposition process
S106 Painting process
S108 Laser removal process
S110 clear printing process
S112 Clear coat layer forming process

Claims (3)

An underlayer forming step of forming an underlayer on the surface of a transparent or translucent synthetic resin container body,
A thin-film deposition step of forming a metal film layer on the under-layer by thin-film deposition,
The coating process of forming a coating film layer on the metal film layer and
A laser removing step of irradiating a laser beam to partially remove the coating film layer, the metal film layer, and the under layer to form a window portion.
A clear printing process in which a clear coat material is applied to the window portion and its boundary portion using a screen printing method, and
A method for manufacturing a container, which comprises a clear coat layer forming step of curing a clear coat material applied in the clear printing step to form a clear coat layer. The main body of the container is substantially cylindrical or substantially elliptical, and a window is formed on the peripheral surface.
In the clear printing process, printing is applied by moving the squeegee or screen, and at the same time,
The method for manufacturing a container according to claim 1, wherein the clear coat material is applied while rolling the container body at a speed equivalent to the moving speed of the moving squeegee or screen. The container body has ridges on the inner surface of the mouth,
The clear printing process is substantially the same as the internal shape of the container body, and a holding jig having a groove at the position of the mouth of the container body is inserted into the container body, and the ridge and the groove are formed. The method for manufacturing a container according to claim 2, wherein the container body is positioned and held by engaging with the container body, and the container body is rotated by rotating the holding jig.

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