JP4953174B2 - Plastic container - Google Patents

Description

  The present invention relates to a synthetic resin container that exhibits a change in color tone.

  Synthetic resin containers have been used for various purposes in the past, especially for cosmetics and shampoo containers where the decorativeness of the container is a major part of the product, painting, printing, labeling, etc. To showcase its decorativeness and differentiate it from other companies' products.

Various attempts have been made to decorate the container body itself by coloring. For example, Patent Document 1 discloses injection molding of a preform in which a colored layer is intermittently laminated between an inner layer resin and an outer layer resin. In addition, there is a description relating to a container in which the preform is biaxially stretched and blow-molded to develop a colored region in an annular shape.
Japanese Patent Laid-Open No. 2-89409

  An object of the present invention is to provide a synthetic resin container having an unprecedented decorative property, with the object of making the change in color tone appear to a higher degree.

Among the present invention for solving the above technical problems, the means of the invention according to claim 1 is:
Formed from the intermediate from tubular extrusion, it has a layered structure obtained by stacking layers of different at least two tones, by changing at least one of the layer thickness of the two layers in the circumferential direction, the change in the layer thickness Is a synthetic resin container that reveals a gradation-like color change in the circumferential direction ,
Using a multilayer coextrusion die, an inner layer is formed in the first flow path, and at least two layers are formed in a second flow path coaxially disposed outside the first flow path. Is formed by molding a cylindrical intermediate body laminated in multiple layers
It by changing the clearance of each flow path in the vicinity just before the confluence of the layers in the circumferential direction, in which varying the thickness of each layer in the circumferential direction,
It is in.
Here, in this application, the color tone includes not only the color that appears due to the dispersion of pigments and dyes and the light and shade thereof, but also the degree of crystallization of the synthetic resin, the visual effect due to the dispersion of the filler, and the like.

  By changing the thickness of at least one of the two layers having different color tones in the circumferential direction according to the above-described configuration according to claim 1, the change in the layer thickness causes a change in the color tone in the circumferential direction. A synthetic resin container exhibiting a characteristic color tone change can be provided.

  The container of the present invention is formed from a tubular parison for blow molding, or an intermediate body by tubular extrusion molding such as an extruded tube body, and these tubular shapes are formed using a multilayer coextrusion die. When extruding the intermediate body, the thickness of the predetermined layer can be changed in the circumferential direction by changing the clearance of the flow path forming the predetermined layer in the circumferential direction.

  Here, the layer configuration can be variously varied while the number of layers is at least two. For example, in the case of two layers, one of the layers is not necessarily laminated over the entire circumference, and may be partially laminated in the circumferential direction, such as a half circumference or a quarter circumference.

  The change in color tone can be manifested in various variations by combining the change in the layer thickness in the circumferential direction of each layer, but if there is an opaque layer, the color tone of the layer inside it will be externally Is not visible, so that the outer layer is made transparent or semi-transparent in order to make a gradation-like color change appear by using the inner layer's color tone or its change.

Further, only one layer can be configured such that the layer thickness changes in the circumferential direction, and is composed of, for example, an outer layer and an inner layer. It can also be set as such a structure.
In addition, only one layer can be colored, or two layers or a larger number of layers can be colored to reveal a complicated color change.
In addition to coloring with pigments and dyes, fillers can be dispersed so that a milky white shape or a visual effect that reflects light changes in a gradation shape in the circumferential direction.

  Further, the gradation change of the color tone can be monotonously appearing over the entire circumference, or the gradation change can be periodically appearing.

  According to a second aspect of the present invention, in the invention according to the first aspect, two layers having different color tones are laminated, and the layer thickness ratio of one layer decreases monotonously from the front to the back. is there.

  According to the above configuration of the second aspect, it is possible to provide an unprecedented container whose color tone changes monotonously in a gradation from the front to the back.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the synthetic resin container is a blow molded container.

  According to the third aspect of the present invention, it is possible to provide a blow-molded container that exhibits an unprecedented characteristic color tone change due to a gradation-like color tone change in the circumferential direction.

  The means of the invention described in claim 4 is that, in the invention described in claim 1 or 2, the synthetic resin container is a tube container.

  According to the fourth aspect of the present invention, it is possible to provide a tube container that exhibits an unprecedented color tone change due to a gradation-like color tone change in the circumferential direction.

Since the present invention has the above-described configuration, the following effects can be obtained.
According to the first aspect of the present invention, it is possible to provide a synthetic resin container that exhibits an unprecedented characteristic color tone change due to a gradation-like color tone change in the circumferential direction.

  In the invention according to claim 2, it is possible to provide an unprecedented container whose color tone changes monotonously in a gradation form from the front to the back.

  In the invention according to claim 3, it is possible to provide a blow-molded container that exhibits an unprecedented characteristic color tone change due to a gradation-like color tone change in the circumferential direction.

  In the invention according to claim 4, it is possible to provide a tube container in which a characteristic change in color tone that has never existed has been revealed by a gradation-like change in color tone in the circumferential direction.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described along examples with reference to the drawings.
FIG. 1 is a side view of a blow molded container which is an embodiment of a synthetic resin container according to the present invention. FIG. 2 is a plan sectional view taken along line AA in FIG.
The container 1 is a blow molded casing having a mouth tube portion 4, a shoulder portion 5, a cylindrical body portion 6 and a bottom portion 7, and has a laminated structure in which the outer layer 2 and the inner layer 3 are laminated over the entire circumference.

Both the outer layer 2 and the inner layer 3 are made of polypropylene resin and have transparency, and the outer layer 2 is colored orange and the inner layer 3 is colored yellow.
As shown in the plane sectional view of FIG. 2, the thickness of the body 6 is constant over the entire circumference, but the thickness of the outer layer 2 is monotonously decreased from the front F portion to the back B portion. In accordance with such a monotonous change in the layer thickness ratio of both layers, the color tone is monotonously changed in a gradation from the orange color of the front F to the yellow color of the back B (see FIG. 1). ).
In FIG. 1, the black portion represents an orange color and the white portion represents a yellow color portion. In FIG. 1, the color tone is depicted as changing stepwise for convenience of drawing, but actually the color tone changes smoothly and steplessly.

  The blow-molded container of this example uses a multilayer coextrusion molding die, and after forming the outer layer 2 and the inner layer 3 in a cylindrical flow path arranged concentrically, the two layers are merged to form the outer layer 2 and the inner layer. This is a blow-molded tubular laminated parison with 3 layers, but the thickness of each layer can be changed in the circumferential direction by changing the clearance of each flow path in the vicinity of the junction just in the circumferential direction. it can.

  FIG. 3 shows another example of the layer structure of the outer layer 2 and the inner layer 3 in the same plane cross section as that of FIG. 2, and this example is an example in which the outer layer 2 is laminated by a half circumference on the front F side. The half on the side is composed only of the inner layer 2. The thickness of the outer layer 2 monotonously decreases from the front F portion to the side portion.

A blow-molded container having such a layer configuration uses a multi-layer coextrusion die, and has a flat cross-sectional shape in which the inner layer 3 is disposed in a cylindrical flow path and coaxially disposed outside the cylindrical flow path. After forming the outer layer 2 with a semicircular arc-shaped channel, the two layers are merged to blow-mold a tubular laminated parison in which the outer layer 2 and the inner layer 3 are laminated.
The thickness of each layer can be changed in the circumferential direction by changing the clearance of each flow path in the vicinity immediately before the merging point in the circumferential direction.

As mentioned above, although embodiment of this invention was described along the Example, of course, this invention is not limited to this Example,
For example, the layer configuration can be determined in various variations according to the purpose of use and decoration, including the number of layers to be stacked, whether the layers are stacked over the entire circumference, or whether the layers are stacked partially.
In addition to a blow molded container, such a gradation can be realized even in a tube container using a tube body by extrusion molding.
In addition to coloring with pigments and dyes, it is also possible to change the visual effect such as milky white by reflecting fillers and reflecting light into a gradation in the circumferential direction.

  As described above, the synthetic resin container of the present invention has an unprecedented characteristic color change due to a gradation color change in the circumferential direction, and is used in a wide field for the purpose of differentiating from other companies' products. Expected to be used in

It is a side view which shows one Example of the container of this invention. It is a plane sectional view shown along the AA line in FIG. It is a plane sectional view showing other examples of layer composition of an outer layer and an inner layer like FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Container 2; Outer layer 3; Inner layer 4; Mouth part 5; Shoulder part 6; Trunk part 7; Bottom part F;

Claims (4)

A layered structure in which at least two layers having different color tones are laminated is formed from an intermediate body by cylindrical extrusion molding, and the thickness of at least one of the two layers is changed in the circumferential direction. A synthetic resin container that has a gradation-like color tone change in the circumferential direction due to a change ,
Using a multilayer coextrusion die, an inner layer is formed in the first flow path, and at least two layers are formed in a second flow path coaxially disposed outside the first flow path. Is formed by molding a cylindrical intermediate body laminated in multiple layers,
A synthetic resin container characterized in that the thickness of each layer is changed in the circumferential direction by changing the clearance of each flow path in the vicinity of the confluence of each layer in the circumferential direction. The synthetic resin container according to claim 1, wherein two layers having different color tones are laminated, and the layer thickness ratio of one layer monotonously decreases from the front to the back. The synthetic resin container according to claim 1, which is a blow molded container. The synthetic resin container according to claim 1, which is a tube container.