JP2021172423A - Extrusion blow container - Google Patents

Abstract

To change density of a hue in a circumferential direction within a belt-like portion extending in a vertical direction.SOLUTION: An extrusion blow container has a projection rib 15, which is formed of a first resin material W1 having light transmission, projects inward in a radial direction, extends in a vertical direction, and provided on at least an inner peripheral surface of a body part, and includes a colored stripe 16 that is formed of a second colored resin material W2 and extends in the vertical direction along the projection rib. At least a part of the projection rib is composed of the colored stripe; the intermediate part in the circumferential direction in the colored stripe projects inward in a radial direction; and a thickness in the radial direction of the colored stripe gets thinner toward each of both end edges in the circumferential direction from an inner end 16a in the radial direction positioned at the intermediate part in the circumferential direction in the colored stripe.SELECTED DRAWING: Figure 2

Description

The present invention relates to an extruded blow container.

Conventionally, a container that exerts a gradation effect by changing the color intensity in the vertical direction, for example, as shown in Patent Document 1 below, has been known.

Japanese Unexamined Patent Publication No. 2005-342900

By the way, in recent years, there has been a demand for a container that exhibits a new decorative effect by changing the color depth in the circumferential direction only in the strip-shaped portion extending in the vertical direction.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an extruded blow container capable of changing the color intensity in the circumferential direction only in a strip-shaped portion extending in the vertical direction. do.

The present invention employs the following means to solve the above problems. That is, the extruded blow container of the present invention is formed of a first resin material having light transmission, and at least on the inner peripheral surface of the body portion, a protruding rib that protrudes inward in the radial direction and extends in the vertical direction is provided. , A colored strip formed of a colored second resin material and extending in the vertical direction along the protruding rib is provided, and at least a part of the protruding rib is composed of the colored strip, and the circumference of the colored strip is formed. The middle portion in the direction protrudes inward in the radial direction, and the thickness in the radial direction of the colored strip is such that both ends in the circumferential direction from the inner end portion in the radial direction located in the middle portion in the circumferential direction in the colored strip. It becomes thinner toward the edge.

According to the present invention, at least a part of the protruding ribs is formed of a colored second resin material and is composed of colored stripes extending in the vertical direction along the protruding ribs, so that the ribs are viewed from the outside in the radial direction. At that time, the color of the second resin material can be visually recognized from the strip-shaped portion extending in the vertical direction corresponding to the protruding rib.
Since the radial thickness of the colored strips becomes thinner in the colored strips from the inner end portion in the radial direction located in the middle portion in the circumferential direction toward both end edges in the circumferential direction, from the outer side in the radial direction. When viewed, the color of the second resin material appears lighter from the middle portion in the circumferential direction of the colored strip toward both end edges in the circumferential direction. As a result, it is possible to exert a gradation effect in which the color depth changes in the circumferential direction only in the band-shaped portion extending in the vertical direction corresponding to the protruding rib.
Since the colored strips form at least a portion of the protruding ribs rather than the smooth, non-forming parts of the protruding ribs, the entire resin material forming the protruding ribs during the process of extrusion forming the parison. The second resin material forming the colored stripes follows the inward flow in the radial direction. As a result, the intermediate portion in the circumferential direction protrudes inward in the radial direction, and the thickness in the radial direction becomes thinner from the intermediate portion in the circumferential direction toward both end edges in the circumferential direction. It can be easily formed.

The radial inner end portion of the colored strip may be circumferentially separated from the circumferential central portion of the colored strip.

In this case, in the colored strips, the portion having the darkest color when viewed from the outside in the radial direction and the thickest portion in the radial direction including the inner end portion in the radial direction is from the central portion in the circumferential direction in the colored strips. Since they are separated in the circumferential direction, the degree to which the color intensity changes slightly from the middle part of the colored strip in the circumferential direction toward both end edges in the circumferential direction can be made different between one side and the other side in the circumferential direction. It becomes possible and the decorativeness can be improved.

The colored strip may form the protruding rib over the entire length in the vertical direction.

In this case, since the colored strips form the protruding ribs over the entire length in the vertical direction, the intermediate portion in the circumferential direction protrudes inward in the radial direction, and the thickness in the radial direction is the intermediate portion in the circumferential direction. It is possible to easily form colored stripes that become thinner toward both end edges in the circumferential direction over the entire length in the vertical direction.

The circumferential middle portion of the protruding rib protrudes inward in the radial direction, and the radial thickness of the protruding rib is the radial inner end portion located in the circumferential middle portion of the protruding rib. The protrusions and the inner ends of the colored strips in the radial direction may be located at equivalent positions along the circumferential direction.

In this case, the radial thickness of the protruding rib becomes thinner in the protruding rib from the inner end portion in the radial direction located in the middle portion in the circumferential direction toward both end edges in the circumferential direction. The inner ends of the colored strips in the radial direction are located at equivalent positions along the circumferential direction.
As a result, when the parison is formed in the process of extrusion molding, the second resin material forming the colored stripes surely follows the inward flow of the entire resin material forming the protruding ribs in the radial direction. Make sure that the middle part in the circumferential direction protrudes inward in the radial direction, and the thickness in the radial direction becomes thinner from the middle part in the circumferential direction toward both end edges in the circumferential direction. Can be formed.

At least a part of the protruding ribs may extend in the vertical direction while being bent in the circumferential direction.

In this case, since at least a part of the protruding ribs extends in the vertical direction while bending in the circumferential direction, the decorativeness can be surely improved.

The colored strip may be covered with the first resin material over the entire area.

In this case, since the colored strips are covered with the first resin material over the entire area, the second resin is used for the base provided at the tip of the extruder when forming the parison in the extrusion molding process. Only the first resin material is slidably contacted without sliding the materials, so that the flow resistance of the molten resin to the mouthpiece and the like can be made equal over the entire area of the mouthpiece and the like, and an extruded blow container can be easily formed. be able to.

According to the present invention, the color intensity can be changed in the circumferential direction only in the strip-shaped portion extending in the vertical direction.

It is a side view of the extrusion blow container shown as one Embodiment which concerns on this invention. FIG. 2 is a cross-sectional view taken along the line II-II of the extruded blow container shown in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The extruded blow container 1 according to the present embodiment is formed of a first resin material W1 having light transmittance. The first resin material W1 may be colored as long as the inside of the extruded blow container 1 can be visually recognized from the outside in the radial direction.

As shown in FIG. 1, the extruded blow container 1 is configured such that a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14 are continuously provided in this order from top to bottom along the container shaft O. Has been done.
Hereinafter, the direction along the container axis O is referred to as a vertical direction, the direction intersecting the container axis O when viewed from the vertical direction is referred to as a radial direction, and the direction orbiting around the container axis O is referred to as a circumferential direction.

As shown in FIGS. 1 and 2, at least the inner peripheral surface of the body portion 13 is provided with a protruding rib 15 that projects inward in the radial direction and extends in the vertical direction.

In the present embodiment, the protruding ribs 15 are integrally formed on the peripheral wall portions of the mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14. A plurality of protruding ribs 15 are provided at intervals in the circumferential direction. The protruding ribs 15 adjacent to each other in the circumferential direction extend substantially parallel to each other when viewed from the outside in the radial direction. When viewed from the outside in the radial direction, the portions of the protruding ribs 15 located at the mouth portion 11 and the shoulder portion 12 extend straight in the vertical direction, and the portions located on the peripheral wall portion of the body portion 13 and the bottom portion 14 are in the circumferential direction. It extends in the vertical direction while bending.
In addition, one protruding rib 15 may be provided, may extend straight in the vertical direction over the entire length in the vertical direction when viewed from the outside in the radial direction, or may be bent in the circumferential direction over the entire length in the vertical direction. It may extend in the vertical direction, or may be formed only on the body portion 13.

The circumferential middle portion of the protruding rib 15 projects inward in the radial direction, and the radial thickness of the protruding rib 15 is the radial inner end portion located in the circumferential middle portion of the protruding rib 15. It becomes thinner from 15a toward both ends in the circumferential direction.

In the present embodiment, the protruding rib 15 exhibits a triangular shape that points inward in the radial direction in a cross-sectional view orthogonal to the container axis O. In the protruding rib 15, the two side surfaces 15b facing in the circumferential direction extend in a direction approaching each other in the circumferential direction toward the inside in the radial direction, and exhibit a concave curved shape in the cross-sectional view. The radial inner end portion 15a of the protruding rib 15 is separated from the circumferential central portion of the protruding rib 15 in the circumferential direction. The radial inner end 15a of the protruding rib 15 is sharpened inward in the radial direction. The plurality of protruding ribs 15 located at the same vertical position have the same shape and the same size in the cross-sectional view.

The radial inner end portion 15a of the protruding rib 15 may be located at the central portion of the protruding rib 15 in the circumferential direction, and the radial inner end portion 15a of the protruding rib 15 is directed inward in the radial direction. It may have a surface that is not sharp and faces inward in the radial direction. The plurality of protruding ribs 15 located at the same vertical position may have different shapes and different sizes in the cross-sectional view. The peripheral portion of the projecting rib 15 in the circumferential direction may not be projected inward in the radial direction, and the inner peripheral surface of the projecting rib 15 may be positioned at the same radial position over the entire length in the circumferential direction.

Then, in the present embodiment, a colored strip 16 formed of the colored second resin material W2 and extending in the vertical direction along the protruding rib 15 is provided, and at least a part of the protruding rib 15 is formed by the colored strip 16. It is configured. When the first resin material W1 is colored, the color of the second resin material W2 may be darker than the color of the first resin material W1.

The circumferential middle portion of the colored strip 16 projects inward in the radial direction, and the radial thickness of the colored strip 16 is the radial inner end portion located in the circumferential middle portion of the colored strip 16. It becomes thinner from 16a toward both ends in the circumferential direction.

The radial inner end portion 16a of the colored strip 16 is separated from the circumferential central portion of the colored strip 16 in the circumferential direction. The colored strip 16 is covered with the first resin material W1 over the entire area. The radial inner end 16a of the colored strip 16 is pointed inward in the radial direction. The plurality of colored strips 16 located at the same vertical position have the same shape and the same size in the cross-sectional view.

The radial inner end portion 16a of the colored strip 16 may be located at the central portion of the colored strip 16 in the circumferential direction, and the radial inner end portion 16a of the colored strip 16 is directed inward in the radial direction. It may have a surface that is not sharp and faces inward in the radial direction. Further, the colored strip 16 may be exposed inside the extrusion blow container 1. The plurality of colored strips 16 located at the same vertical position may exhibit different shapes and different sizes in the cross-sectional view.

Similar to the protruding rib 15, the colored strip 16 has a triangular shape that points inward in the radial direction in the cross-sectional view, and the two side surfaces 16c facing the circumferential direction of the colored strip 16 are radial in the radial direction. As it goes inward, it extends in a direction approaching each other in the circumferential direction and exhibits a concave curve shape. The radial inner ends 15a and 16a of the protruding rib 15 and the colored strip 16 are located at equivalent positions along the circumferential direction. The radial inner ends 15a and 16a of the protruding rib 15 and the colored strip 16 are sharpened in a direction slightly inclined in the circumferential direction with respect to the radial direction. In the colored strip 16, the triangular bottom portion 16b located at the outer end in the radial direction is located at the same radial position as the inner peripheral surface of the extrusion blow container 1. In the cross-sectional view, the colored strip 16 exhibits a similar shape slightly smaller than that of the protruding rib 15. The colored strip 16 constitutes the protruding rib 15 over the entire length in the vertical direction.

The shapes of the protruding ribs 15 and the colored strips 16 in the cross-sectional view may be different from each other, and the side surfaces 15b and 16c of the protruding ribs 15 and the colored strips 16 respectively extend linearly in the cross-sectional view. You may. The bottom portion 16b of the colored strip 16 may be radially separated from the inner peripheral surface of the extrusion blow container 1.

The extrusion blow container 1 configured as described above is first in a molten state between a mouthpiece provided at the tip of the extruder and a tip rotatably provided inside the mouthpiece around the device axis. The first resin material W1 and the second resin material W2 in the above can be obtained by forming a parison by rotating the chip around the device axis while flowing in the device axis direction, and then blow molding the parison. can.

When forming the parison, the second resin material W2 in the molten state is in the molten state while flowing in the direction of the device axis at a plurality of places spaced around the device axis between the base and the chip. 1 In a state where the resin material W1 is in an annular shape extending continuously over the entire circumference around the device axis, each portion located on both sides of the second resin material W2 in the device radial direction is formed between the base and the chip. Flow in the direction of the device axis.
At this time, a plurality of recesses are formed on the outer peripheral surface of the chip at intervals around the device axis, and one of the two annular first resin materials W1 located inside in the device radial direction. By allowing the portions and the second resin material W2 to flow in these recesses in the axial direction of the device, protrusions that become protruding ribs 15 during blow molding are formed on the inner peripheral surface of the parison.

As described above, according to the extrusion blow container 1 according to the present embodiment, at least a part of the protruding ribs 15 is formed of the colored second resin material W2 and extends in the vertical direction along the protruding ribs 15. Since it is composed of the colored strips 16, the color of the second resin material W2 can be visually recognized from the strip-shaped portion extending in the vertical direction corresponding to the protruding rib 15 when viewed from the outside in the radial direction.

Since the radial thickness of the colored strip 16 becomes thinner in the colored strip 16 from the inner end portion 16a in the radial direction located in the middle portion in the circumferential direction toward both end edges in the circumferential direction, the thickness in the radial direction becomes thinner. When viewed from the outside, the color of the second resin material W2 appears lighter from the middle portion in the circumferential direction of the colored strip 16 toward both end edges in the circumferential direction. As a result, it is possible to exert a gradation effect in which the color depth changes in the circumferential direction only in the strip-shaped portion extending in the vertical direction corresponding to the protruding rib 15.

Since the colored strip 16 constitutes at least a part of the protruding rib 15 rather than a smooth, non-forming portion of the protruding rib 15, the protruding rib 15 is formed when the parison is formed in the process of extrusion molding. The second resin material W2 forming the colored strip 16 follows the inward flow of the entire resin material in the radial direction. As a result, the central portion in the circumferential direction protrudes inward in the radial direction, and the thickness in the radial direction becomes thinner from the intermediate portion in the circumferential direction toward both end edges in the circumferential direction. Can be easily formed.

In the colored strip 16, the portion having the darkest color when viewed from the outside in the radial direction and the thickest portion in the radial direction including the inner end portion 16a in the radial direction is from the central portion in the circumferential direction of the colored strip 16. Since they are separated in the circumferential direction, the degree to which the color density changes slightly from the middle portion of the colored strip 16 in the circumferential direction toward both end edges in the circumferential direction is different between one side and the other side in the circumferential direction. Is possible, and the decorativeness can be improved.

Since the colored strip 16 constitutes the protruding rib 15 over the entire length in the vertical direction, the intermediate portion in the circumferential direction protrudes inward in the radial direction, and the thickness in the radial direction is from the intermediate portion in the circumferential direction. Colored strips 16 that become thinner toward both end edges in the circumferential direction can be easily formed over the entire length in the vertical direction.

The radial thickness of the protruding rib 15 becomes thinner in the protruding rib 15 from the inner end portion 15a in the radial direction located in the middle portion in the circumferential direction toward both end edges in the circumferential direction. , And the inner ends 15a and 16a of the colored strips 16 in the radial direction are located at equivalent positions along the circumferential direction.
As a result, when the parison is formed in the process of extrusion molding, the second resin material W2 forming the colored strip 16 surely follows the inward flow of the entire resin material forming the protrusion rib 15 in the radial direction. The colored strips in which the middle portion in the circumferential direction protrudes inward in the radial direction, and the thickness in the radial direction becomes thinner from the middle portion in the circumferential direction toward both end edges in the circumferential direction. 16 can be reliably formed.

Since at least a part of the protruding rib 15 extends in the vertical direction while bending in the circumferential direction, the decorativeness can be surely improved.

Since the colored strip 16 is covered with the first resin material W1 over the entire area, the second resin material is used with respect to the mouthpiece or the like provided at the tip of the extruder when forming a parison in the process of extrusion molding. Only the first resin material W1 is in sliding contact without sliding W2, so that the flow resistance of the molten resin with respect to the mouthpiece and the like can be made equal over the entire area of the mouthpiece and the like, and the extrusion blow container 1 can be easily made. Can be formed.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

As the extrusion blow container 1, a multilayer structure in which the layer located on the innermost side in the radial direction and the layer located on the outermost side in the radial direction are made of the same material may be adopted.
In this case, when the parison is formed in the process of extrusion molding, the flow resistance of the molten resin to the mouthpiece or the like can be made equal over the entire area of the mouthpiece or the like, and the extrusion blow container can be easily formed. ..

Both the colored strip 16 and the protruding rib 15 may be extended straight in the vertical direction over the entire length in the vertical direction while being positioned at the same position in the circumferential direction.
In this case, when the parison is formed in the process of extrusion molding, the second resin material W2 forming the colored stripe 16 is colored in the flow toward the inside in the radial direction of the entire resin material forming the protruding rib 15. The second resin material W2 is to follow the entire length of each of the strip 16 and the protruding rib 15 in the vertical direction, and from the strip-shaped portion extending in the vertical direction corresponding to the protruding rib 15 when viewed from the outside in the radial direction. It is possible to visually recognize the color of.

In addition, it is possible to replace the components in the embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the embodiments and modifications may be combined as appropriate.

1 Extruded blow container 13 Body 15 Protruding ribs 16 Colored strips W1 1st resin material W2 2nd resin material

Claims (6)

Formed from a light-transmitting first resin material,
At least on the inner peripheral surface of the body, a protruding rib that protrudes inward in the radial direction and extends in the vertical direction is provided.
A colored strip formed of a colored second resin material and extending in the vertical direction along the protruding rib is provided.
At least a part of the protruding rib is composed of the colored strips.
The circumferential middle portion of the colored strip protrudes inward in the radial direction.
An extruded blow container in which the radial thickness of the colored strips becomes thinner in the colored strips from the inner end portion in the radial direction located in the middle portion in the circumferential direction toward both end edges in the circumferential direction. The extruded blow container according to claim 1, wherein the inner end portion in the radial direction of the colored strip is separated from the central portion in the circumferential direction of the colored strip in the circumferential direction. The extruded blow container according to claim 1 or 2, wherein the colored strip constitutes the protruding rib over the entire length in the vertical direction. The circumferential middle portion of the protruding rib protrudes inward in the radial direction.
The radial thickness of the protruding rib becomes thinner in the protruding rib from the inner end portion in the radial direction located in the middle portion in the circumferential direction toward both end edges in the circumferential direction.
The extruded blow container according to any one of claims 1 to 3, wherein the protruding ribs and the inner ends of the colored strips in the radial direction are located at equivalent positions along the circumferential direction. The extrusion blow container according to any one of claims 1 to 4, wherein at least a part of the protruding ribs extends in the vertical direction while being bent in the circumferential direction. The extrusion blow container according to any one of claims 1 to 5, wherein the colored strip is covered with the first resin material over the entire area.

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