JPS6114875B2 - - Google Patents

Description

Detailed Description of the Invention The present invention creates a shading pattern on the plastic container body (including the work-in-progress that becomes the copper part of the container), more precisely from the color of the container body itself (hereinafter referred to as the ground color). The present invention relates to a method of forming a pattern that gradually changes to another color and becomes the other color. In the following, when we refer to a shading pattern, we are referring to a pattern that has a portion (shaded portion) where the color mentioned above gradually changes.

Containers, especially containers for cosmetics, etc., have a great influence on the consumer's willingness to purchase, so special consideration is given to their design, and adding a shading pattern is one example of this.

As a method of imparting a shading pattern to a container, methods described in Japanese Patent Application Laid-open No. 49-21464, Japanese Patent Application Laid-Open No. 49-25758, etc. are known. In this method, a main injection molding device equipped with an auxiliary injection molding device is used to inject different colored resins from both devices to form a striped pattern. The colors mix slightly, resulting in a blurred pattern.

However, the width of this blurred part is extremely narrow, and it is difficult to make the width of the blurred part uniform.Also, with horizontal striped patterns, it is difficult to obtain uniform width of the stripes.Furthermore, the device is complicated. The drawback is that the molding speed of the container is slow.

The present invention eliminates these drawbacks and easily obtains a blurred pattern by rotating a plastic container body whose entire surface is colored around the central axis of the container body. , from a spray nozzle of a type that is fixed so that it can spray toward the container body and whose spray amount per unit area gradually decreases from the spray center to the periphery, a color different from the ground color of the container body. This method is characterized by spraying paint to form a pattern that gradually changes from the background color of the container body to the color of the paint. According to the present invention, the width of the blurred portion can not only be made uniform but also widened, and there is an advantage that a complicated device is not required.

Next, embodiments of the present invention will be described with reference to the drawings.

Example 1 FIG. 1 shows one embodiment of the method of the present invention, and is a schematic diagram showing a state in which a mandrel is inserted into a tube body and colored spray painting is applied from a spray nozzle while rotating the tube body. Figure 2 shows the shape and coating of the spray pattern (dark areas are shown with dense diagonal lines and light areas are shown with coarse lines. The same applies to the following spray patterns) to form a blurred pattern by applying colored spray paint to the tube body. The diagram showing the position and FIG. 3 are diagrams showing a blurred pattern formed on the tube body surface by the apparatus of FIG. 1 and the spray pattern of FIG. 2.

A polyethylene tube colored yellow and molded into a cylindrical shape by extrusion molding is cut to the length of one container. After surface treatment is applied to the cut tube 1, a rotatable mandrel 2 is attached. A type of spray nozzle that is inserted (see Figure 1) and whose spray amount per unit area gradually decreases from the spray center to the periphery, in other words, the center 4 where the coating is applied is thicker and gradually becomes lighter toward the periphery 5. Spray nozzle 3 that can spray so that 5 is the lightest color
was set at a position such that the center of the nozzle 3 faced one end of the container body 1, and orange paint was sprayed from the spray nozzle 3 while rotating the mandrel 2 and rotating the tube body 1. However,
As shown in FIG. 3, one end 1a of the container body 1
And the orange part 6a where the vicinity is the brightest
As we go to the right in Fig. 3, the orange color fades and the yellow color increases, and the color gradually changes from the orange part 6a to the yellow part 6b, which is the ground color. I was able to form 1.

After drying the paint, this tube body 1 was subjected to printing, drying, protective coating, and drying treatment in a conventional manner, and then the head was fixed to obtain a finished tube product. (The head fixing process may also be carried out before the coloring spraying.) In the present invention, since the base color of the tube body is used, one coloring spray painting can be applied to two types of dark colored areas and the shading in between. It is possible to form a multicolored pattern with parts.

It is also possible to add a spray nozzle that sprays paint of the same color to form a two-color repeated horizontal striped blurred pattern as shown in Figure 4, or after forming a repeated horizontal striped blurred pattern on a long tube body, Processing efficiency can also be improved by cutting into one tube body 1.

Example 2 After surface-treating an extruded yellow tube body 1 made of polyethylene with the length of one container, the same spray nozzles as used in Example 1 were placed at both ends of the container body 1, facing each other while rotating. Place it in a position that will
By spraying edge color paint G on the right end side, the left end of the container and its vicinity become the brightest orange part 6a, and as you move towards the right side of the figure, the orange color gradually decreases and the yellow color gradually increases. It becomes a yellow part 6b after passing through a transition part 6c, and further passes through a part 6d that gradually changes from yellow to green to become a green part 6e at the other end.
A container body was obtained that ended in . This tube body 1 was treated in the same manner as in Example 1 to obtain a finished tube product.

Here, if you add spray nozzles 3 that spray orange and green paint, you can repeatedly obtain a blurred pattern, and if you spray paint of different colors from many spray nozzles, you can create many different colors. A horizontal striped blur pattern can be obtained.

For example, the shape of the spray pattern shown in FIG. 7 (in this example, 7 is orange and 8 is green),
If orange and green paint are sprayed from two spray nozzles having different positions, as shown in FIG. It is possible to obtain a container body having a color of a portion 6d that changes to yellow and a color of a yellow portion 6b.

In this case, the area 9 where the two colors of paint overlap will become a mixture of both colors if both paints are wet, so if you need to avoid this, spray one color first and let it dry. After that, spray the other side.

The present invention is applicable not only to the tube body as described above but also to other containers. For example, in the case of a finished product molded by blow molding in the shape shown in Figure 9, a mandrel is inserted through the mouth, and the outside is spray-painted by the method described in the example while rotating the whole. A desired blur pattern can be formed on the surface. At this time, if the material of the object to be painted is a resin having no polar groups such as polyethylene, it is desirable to perform surface treatment such as frame treatment in advance in order to improve the adhesion of the paint.

As described above, the present invention has the advantage that it is possible to form a uniform, desired wide color gradient portion on a plastic container body in a short period of time using a simple device. Furthermore, by selecting the base color, the paint color, and the number of spray nozzles to be arranged, it is possible to obtain containers with many combinations of color transitions. The method of the invention is particularly useful.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the method of the present invention, and FIG. 2 is a spray pattern for forming a blurred pattern on a tube body. FIG. 3 is a diagram showing a blurred pattern formed on the tube body. Figure 4 shows the third
A diagram showing a blur pattern that repeats the blur pattern in the figure. Figure 5 shows two steps to form another blur pattern.
Spray pattern with two different colored sprays. FIG. 6 is a diagram showing a blurred pattern created by the spray pattern of FIG. 5. Figure 7 shows a spray pattern for forming other shading patterns. FIG. 8 is a diagram showing a blurred pattern created by the spray pattern of FIG. 7. FIG. 9 is a diagram showing another example of an object to be coated to which the present invention can be applied. 1...Tube body, 2...Rotating mandrel, 3
...Spray nozzle, 6c, 6d, 6f... Part where the color changes gradually.

Claims (1)

[Claims] 1. A plastic container body whose entire surface is colored is fixed so that it can be sprayed toward the container body while being rotated around the central axis of the container body, and from the injection center toward the periphery. A paint with a color different from the ground color of the container body is sprayed from a spray nozzle that gradually decreases the amount of spray per unit area to create a pattern that gradually changes from the ground color of the container body to the paint color. A method for forming a pattern on a plastic container body, the method comprising forming a pattern on a plastic container body.