JP2004352325A - Light cutoff container and manufacturing method for light cutoff container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light cutoff container capable of preventing a light transmission through the barrel part and bottom part of this transparent container and easily being recycled. <P>SOLUTION: This light cutoff container is covered by one light cutoff cylindrical label 3 ranging from the barrel part 21 to the bottom surface of a light transmission type container 2. The light cutoff container comprises a light transmission type container 2 having the barrel part 21 and a ground contact part 221 for making a self-standing state and a light cutoff type thermal shrinkage cylindrical label 3 capable of covering the barrel part 21 and the bottom surface 22 of the container 2. The cylindrical label 3 is installed at the barrel 21 of the container 2 and further installed along a shape of the ground contact part 221 and at the same time a lower opening part 35 of the cylindrical label 3 is closed by the bottom surface 22 of the container 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light-shielding container whose body and bottom are coated with a light-shielding label and a method of manufacturing the light-shielding container in order to more reliably prevent transmission of light such as ultraviolet rays.
[0002]
[Prior art]
BACKGROUND ART Conventionally, synthetic resin molded containers such as so-called PET bottles and glass containers have been widely used as containers for beverages and foods. In addition, when filling contents such as green tea or yogurt that are liable to be deteriorated or discolored by light, colored containers have been used to impart light shielding properties. , Transparent containers are used.
[0003]
Therefore, a light-shielding container in which a cylindrical label made of, for example, a white film is attached to a body of a light-transmitting container such as a transparent container is known. However, simply attaching a light-blocking cylindrical label to the body of the container does not result in a container having sufficient light-blocking properties because ultraviolet light or the like is transmitted through the bottom surface of the container.
In view of such a point, Japanese Patent Application Laid-Open No. 2002-68202 discloses an ultraviolet-shielding bottle in which a heat-shrinkable label made of an ultraviolet-shielding film is attached to the body of a container and an ultraviolet-shielding ink layer is provided on the bottom surface of the container. Is disclosed.
[0004]
[Patent Document 1]
JP-A-2002-68202 ([Claim 1] on page 2 and FIG. 1 etc.)
[0005]
[Problems to be solved by the invention]
However, the means described in this publication has a problem in that, when the container is recycled, in addition to the removal of the cylindrical label, the ultraviolet blocking ink must be peeled off, and the container cannot be easily recycled. Further, the ultraviolet blocking ink layer applied to the bottom surface may be partially peeled off due to rubbing at the time of transportation or the like.
Further, when manufacturing the light-shielding container described in the above publication, ink must be applied to the bottom surface of the container in addition to the step of attaching the cylindrical label, and particularly, ink is applied to a container having a complicated bottom shape. It is difficult to apply.
[0006]
Therefore, an object of the present invention is to provide a light-shielding container that can prevent light transmission from the body and the bottom surface of the light-transmitting container, and can easily remove the light-blocking unit during recycling.
Another object of the present invention is to provide a method for manufacturing a light-shielding container that can easily manufacture a light-shielding container in which a body and a bottom surface of the container are covered with a light-shielding label.
[0007]
[Means for Solving the Problems]
The light-shielding container according to the present invention is characterized in that the light-shielding container 2 is covered with one light-shielding tubular label 3 from the body 21 to the bottom surface 22.
That is, the present invention provides a light-transmitting container 2 having a bottom portion 22 on which a body portion 21 and a grounding portion 221 for self-supporting are formed, and a light-shielding heat shrinkable covering the body portion 21 and the bottom surface 22 of the container 2. And the cylindrical label 3 is attached to the body 21 of the container 2 by heat shrinkage, and is attached along the shape of the grounding portion 221. It provides a light-tight container whose lower opening 35 is closed by the bottom surface 22 of the container 2.
[0008]
The light-shielding container 1 can more reliably prevent transmission of ultraviolet light and the like, and the light-shielding means is a means for covering the body 21 and the bottom surface 22 of the container 2 with the light-shielding tubular label 3. At the time of recycling, the tubular label 3 can be cut out and easily removed. Further, since the bottom surface 22 of the container 2 is rubbed at the time of transportation, there is no possibility that the container 2 will be peeled off because it is covered with the label 3.
Furthermore, since the cylindrical label 3 is attached along the shape of the grounding portion 221 of the container 2, the container 2 can be made to stand alone without any trouble, and the container has a beautiful appearance.
[0009]
The bottom surface 22 of the container 2 is formed with a concave portion 222 that is depressed inward, and the grounding portion mounting portion 36 of the cylindrical label 3 is thermally shrunk gradually toward the inside of the grounding portion 221 of the container 2. The light-shielding container 1 in which the closing portion 32 for closing the lower opening 35 of the cylindrical label 3 is provided in the space 28 defined by the concave portion 222, Does not protrude downward from the grounding portion 221 of the container, thus maintaining the self-standing stability without any difference from the conventional container, and furthermore, when transported, dust or the like adheres to the closed portion 32, This is preferable because it can be prevented from being caught on the surface.
[0010]
Further, the light shielding container 1 in which the lower opening 35 of the cylindrical label 3 is closed by closing the lower end 31 of the cylindrical label 3 with the lower end 31 of the cylindrical label 3 and forming it into a substantially flat shape by plastic deformation. This is preferable because the closed portion 32 is not bulky, and the closed lower opening 35 can be prevented from being opened carelessly due to vibration during transportation.
[0011]
The second means of the present invention resides in a manufacturing method, wherein a heat-shrinkable cylindrical label 3 having a length capable of covering the body 21 and the bottom surface 22 of the container 2 is provided. 2 is inserted into the container 2 in a state of protruding downward from the body 21 and the bottom surface 22 of the container 2, a heat shrinking process of thermally shrinking the cylindrical label 3, and after the heat shrinking, is projected below the bottom surface 22 of the container 2. A method of manufacturing a light-shielding container including a closing step of pressing a lower end portion 31 of the cylindrical label 3 to the bottom surface 22 side of the container 2 to close a lower opening 35 of the cylindrical label 3.
[0012]
According to the above manufacturing method, the cylindrical label 3 is inserted and thermally contracted, and the lower end 31 of the label 3 generated after the contraction is pressed toward the bottom surface 22 of the container 2 in a simple step. The light-shielding cylindrical label 3 can be attached to the body 21 and the bottom surface 22 and the lower opening 35 thereof can be closed.
Therefore, the light-shielding container 1 in which the body 21 and the bottom surface 22 are covered with the cylindrical label 3 can be easily manufactured.
[0013]
Further, according to the manufacturing method in which the closing step presses the lower end 31 of the tubular label 3 while the lower end 31 is softened due to the residual heat during heat shrinkage, the lower end 31 is plastically formed without providing a separate heating step. This is preferable because the lower opening 35 can be closed by being deformed.
[0014]
Further, a concave portion 222 concaved inward is formed in the bottom surface 22 of the container 2 so that the closing step closes the lower opening 35 of the tubular label 3 in the space 28 defined by the concave portion 222. According to the above manufacturing method of pressing, the light shielding container 1 in which the closing portion 32 is accommodated in the concave portion 222 of the container 2 can be manufactured, which is preferable.
[0015]
Further, in a preferred embodiment of the present invention, a grounding portion 221 for making the container 2 self-standing is formed on the bottom surface 22 of the container 2, and the heat shrinking step is in close contact with at least the shape of the grounding portion 221. The method for manufacturing the light-shielding container in which the cylindrical label 3 is heat-shrinked up to this point is preferable.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings. In the present specification, the terms “up” and “down” as directions indicating directions are based on a state in which the container is self-standing.
In FIG. 1, reference numeral 1 denotes a light-shielding container in which at least a trunk 21 and a bottom surface 22 of a self-supporting light-transmitting container 2 are covered with a heat-shrinkable tubular label 3 having a light-shielding property.
[0017]
Specifically, the container 2 is made of, for example, a molded container made of a synthetic resin such as a container made of polyethylene terephthalate (a so-called PET bottle), or a transparent container made of glass or the like. , A take-out portion 24 for taking in and out the filler, a body portion 21 and a bottom surface 22 for self-supporting. The outlet 24 has a spout 241 and a thread 242 formed on the outer peripheral wall. The thread 242 includes a non-transparent resin molded product for opening and closing the spout 241, metal, and the like. Is screwed. A flange 26 projecting outward is formed below the screw 242. The body portion 21 is formed with a shoulder portion 211 whose diameter gradually increases from the flange portion 26 and a substantially cylindrical body portion 212. On the bottom surface 22, a ground portion 221 in contact with the mounting surface to make the container self-supporting on a mounting surface such as a table via a corner portion 27 continuous with the trunk body portion 212, and an inner side of the ground portion 221. A concave portion 222 is formed in which the central portion is depressed inward (toward the container storage portion). The ground portion 221 is formed in a ring shape with a flat bottom surface when viewed from the bottom, and a dome (raised bottom) -shaped concave portion 222 is formed so as to be surrounded by the ground portion 221.
[0018]
A heat-shrinkable tubular label 3 having a light-shielding property is attached to substantially the entire surface of the body 21 of the light-transmitting container 2 by heat shrinkage. The grounding portion mounting portion 36 of the tubular label 3 that is greatly shrunk toward the center axis side is mounted, and the lower opening of the tubular label 3 is closed at the bottom surface 22 of the container 2. .
More specifically, the lower side of the cylindrical label 2 is provided with a grounding portion mounting portion 36 that is bent substantially at right angles along the corner portion 27 while gradually contracting heat, and extends horizontally from the corner mounting portion. . The ground portion mounting portion 36 is largely thermally contracted toward the inside of the ground portion 221 (toward the center axis of the container 2). Further, the label piece extending from the grounding portion mounting portion 36 similarly enters the concave portion 222 of the container 2 while thermally contracting, and the lower end portion 31 is overlapped so as to close the lower opening of the cylindrical label 3. ing. The mating portion of the lower end portion 31 is formed into a substantially flat shape by being attached to the label surface 3a by plastic deformation, and this forms a closing portion 32 for closing the lower opening. Therefore, the closing portion 32 is located and accommodated in the space 28 defined by the concave portion 222 of the container 2.
[0019]
For example, as shown in FIGS. 2A and 2B, the closing portion 32 folds one piece 31a of the lower end portion 31 inward (as if the bag is attached to the bottom) and folds the other piece 31b thereon. As shown in FIGS. 1B and 1B, the inner surface of the cylindrical lower end portion 31 is overlapped into a plate shape, and the plate-shaped overlapping portion 31c is folded on the label surface 3a. As shown in FIGS. (C) -1 and (2), the lower end portion 31 is twisted while being twisted into a twisted thread (like a candy twisted package), and the twisted overlapped portion 31d is folded into the label surface 3a. In this way, the lower end portions 31 of the cylindrical label 3 are regularly aligned and attached to the label surface 3a, and are heat-set in a substantially flat shape by plastic deformation, as shown in FIG. , The lower end 31 is arbitrarily overlapped with the label surface Impregnated is brought shape, is affixed to the cylindrical label 3 of the lower end portion 31 randomly combined label surface 3a the like, such configuration in which heat set into a substantially flat shape is exemplified by and plastic deformation.
[0020]
As shown in FIGS. 3 and 4, the cylindrical label 3 before being attached to the container 2 (before heat shrink) has an inner diameter that can be inserted into and removed from the body 21 of the container 2 and at least the container 2 after heat shrinkage. A tube in which both ends 5a, 5a of the label base material 5 having a length capable of covering the body portion 21 and the bottom surface 22 are center-sealed, and a perforation 6 is formed near the center seal portion 4 as an easy tearing means. Consists of a shape.
The upper side of the cylindrical label 3 covers a trunk covering region 33 (which covers not only the trunk 21 of the container 2 but also part or all of the cap 25 of the container 2) that can cover the trunk 21 of the container 2. The lower side is a bottom surface covering region 34 capable of covering the bottom surface 22 of the container 2.
[0021]
Specifically, the size of the tubular label 3 before the heat shrinkage is appropriately designed depending on the size and shape of the container. For example, the body covering region 33 is substantially equal to the length of the body 21 of the container 2. An example is shown in which the bottom surface covering region 34 is formed to be longer than the radial length of the bottom surface 22 of the container 2. However, if the bottom surface covering region 34 is short, it is difficult to close the lower opening 35 of the tubular label 3 after heat shrinkage as described later, while if too long, the closing portion 32 is bulky. As shown in FIG. 6, the projecting length L of the lower end 31 of the tubular label 3 generated below the bottom surface 22 due to the heat shrinkage is about 1 to 3 times the diameter D of the lower opening 35. Preferably, the length of the bottom surface covering region 34 is designed. When the light-shielding container 1 is configured so as to cover a part or the entirety of the cap 25 of the container 2, the body covering region 33 of the cylindrical label 3 covers a part or the entirety of the cap 25 of the container 2. Make it as long as possible.
When a film that also shrinks in the longitudinal direction is used as the heat-shrinkable film constituting the cylindrical label 3, the length of the cylindrical label 3 after the heat shrinkage becomes shorter. The label 3 may be formed longer by an amount corresponding to the shrinkage rate in consideration of the shrinkage.
[0022]
Next, the label base material 5 constituting the cylindrical label 3 is made of a film having a light-shielding property capable of substantially blocking at least ultraviolet rays and a heat-shrinkable property at least in a width direction (a circumferential direction when the cylindrical label is used). Become.
Specifically, for example, a black printing layer 8 made of black ink mixed with a black pigment such as carbon black is provided on the back surface 7a of the white film 7 exhibiting milky white by a gravure printing method and the like. On the surface 7b of the white film 7, a design printing layer 9 for displaying a product name or the like is provided on a surface corresponding to the trunk portion covering region 33, and a similar black printing layer 8 is provided on a surface corresponding to the bottom covering region 34. The label substrate 5 provided can be used. Therefore, the black print layer 8 is provided on the front and back surfaces 7a and 7b of the bottom surface covering region 34 of the white film 7. As shown, an overprint layer 10 such as a varnish is provided on the surfaces of the design print layer 9 and the black print layer 8.
Further, the thickness of the label substrate 5 is formed to be about 20 to 90 μm, preferably about 30 to 70 μm.
[0023]
The white film 7 is, for example, a polyester resin such as polyethylene terephthalate, an olefin resin such as polypropylene, a styrene resin such as a styrene-butadiene copolymer, a cyclic olefin resin, a vinyl chloride resin, or a mixture of two or more kinds. Such a resin component, a white pigment such as titanium dioxide, barium sulfate, calcium carbonate, and alumina white as an ultraviolet ray blocking agent, and various additives are formed into a film by a known film forming method and can be obtained by stretching. A milky white film or the like can be used. The stretching treatment may be any of a tenter method and a tube method. The stretching treatment is usually performed by stretching at a temperature of about 70 to 110 ° C. in the width direction (TD direction) by 2.0 to 8.0 times, preferably about 3.0 to 7.0 times. Further, if necessary, the stretching treatment may be performed in the longitudinal direction (MD direction) at a low magnification of, for example, 1.5 times or less. The resulting film 7 is a uniaxially stretched film or a biaxially stretched film slightly stretched in a direction orthogonal to the main stretching direction.
[0024]
The thermal property of the film 7 is such that the label 3 can be attached to the trunk 21 of the container 2 at least by heat shrinkage. It is preferable that the material shrink at least to the extent that it can be closely attached along the shape of the above.
Specifically, the heat shrinkage (immersion in warm water at 80 ° C. for 10 seconds) in at least the width direction (the circumferential direction when a cylindrical label is used) is about 30% or more, preferably about 40%, more preferably It is preferable to use a film of about 50% or more. The upper limit of the heat shrinkage rate is preferably as large as possible (generally about 70 to 80%, although it depends on the type of film), since the inner diameter of the lower opening 35 of the tubular label 3 after the heat shrinkage can be made smaller. .
Thermal shrinkage (%) = [{(original length in width direction)-(length after immersion in width direction)] / (original length in width direction)] × 100.
Note that a heat-shrinkable film that slightly shrinks in the longitudinal direction is preferable.
[0025]
As a guide for the light-shielding property of the label base material 5, for example, one having a maximum transmittance of ultraviolet rays having a wavelength of 200 to 400 nm of 30% or less, preferably 20% or less, more preferably about 15% or less is used.
[0026]
Since the light-shielding container 1 having the above configuration is covered with the light-shielding label 3 up to the bottom surface 22, it is possible to prevent transmission of light such as ultraviolet rays. Further, since the label 3 is made of the base material 5 in which the black print layer 8 is provided on the back surface 7a of the white film 7, the label 3 has the advantage of a white background serving as a base of the design print layer 8 and has the advantage of visible light. Can also be prevented from being transmitted. As a measure of the light-shielding property of visible light, for example, when the content is beer or a vitamin, the maximum transmittance at a wavelength of 400 to 600 nm is 20% or less, preferably 10% or less.
In addition, since the light blocking means covers the container 2 with one cylindrical label 3, at the time of recycling, the consumer uses the perforation 6 or the like in the same manner as in the case of a known container with a body label. , The label 3 can be cut off and easily removed. Since the perforations 6 are minute holes, the effect of light transmission is so small as to be almost negligible. However, in order to shield light more reliably, instead of the through-hole type perforations 6 as described above, non-perforations 6 are used. It is preferable to use a non-penetrating type easy-cleaving means, such as a perforated perforation or a half-cut perforated line.
Furthermore, since the cylindrical label 3 is attached along the shape of the grounding portion 221 of the container 2, the container 2 can be made to stand alone without any trouble, and the container has a beautiful appearance. In particular, since the closing portion 32 of the cylindrical label 3 is located in the concave portion 222 of the container 2, the label does not partly protrude from the bottom surface 21, so that the self-standing stability is excellent. It is possible to prevent dust from adhering to the closing portion 32 and to prevent the closing portion 32 from being carelessly caught by an obstacle.
[0027]
Further, since the lower end portion 31 of the cylindrical label 3 is fitted and is formed into a substantially flat shape by plastic deformation, the closing portion 32 is not bulky, and the lower opening which should have been closed due to vibration during transportation or the like. It is possible to prevent the portion 35 from reopening.
Further, it is preferable that the bottom cover area 34 of the tubular label 3 contracts greatly when mounted by heat shrinkage, as described later. However, the tubular label 3 is also printed in black on the surface 7 b of the bottom cover area 34. Since the layer 8 is provided, there is an advantage that heat is easily absorbed when infrared heating is performed.
[0028]
Next, a method of attaching the cylindrical label 3 to the container 2 and a method of manufacturing the light shielding container 1 will be described.
First, while pulling out the continuous label base material in which the label base material 5 is continuously connected, the both ends 5a are center-sealed and wound up, whereby the continuous cylindrical label body in which the cylindrical labels are continuously connected is obtained. Get.
The cylindrical label continuous body is set in a shrink mounting machine such as a labeler, cut into a predetermined length to form one cylindrical label 3, and inserted into the transparent container 2 sent from a conveyor such as a conveyor.
[0029]
Specifically, as shown in FIG. 5, the upper edge of the cylindrical label 3 is located at substantially the same level as the flange 26 of the container 2, and the bottom cover area 34 of the cylindrical label 3 is The cylindrical label 3 is inserted into the container 2 so as to project downward from the container 22. Next, this is guided to a shrink zone provided with warm air or the like, and the tubular label 3 is thermally contracted.
Due to such heat shrinkage, as shown in FIG. 6, the cylindrical label 3 is mounted on the body 21 of the container 2, and a grounding portion mounting portion 36 that gradually shrinks inward is formed inside through the corner 27. You. Further, the grounding portion mounting portion 36 is closely attached to the grounding portion 221, and the cylindrical lower end portion 31 including the lower opening 35 protrudes downward at the center of the bottom surface 22 as a non-mounting portion.
[0030]
The heat shrink temperature is appropriately designed according to the type of the film and is usually about 60 to 200 ° C., but since the beautiful bottom surface can be formed, the bottom covering region 34 is formed by the grounding portion 221 of the container 2. It is preferable that the tubular label 3 be thermally shrunk to such an extent that it adheres closely to the shape, and furthermore, from the viewpoint that the opening area of the lower opening 35 generated after the heat shrinkage can be made smaller, the shrinkage limit of the film or this shrinkage limit. It is more preferable to make the heat shrink to near.
[0031]
Next, while the lower end 31 of the tubular label 3 is softened by the residual heat at the time of thermal contraction, as shown in FIG. 7, the jig 11 which can enter the space 28 defined by the concave portion 222 is used. By pressing the lower end portion 31 toward the concave portion 222 side of the bottom surface 22 and crushing the lower end portion 31 into a substantially flat shape in the space 28, the lower opening portion 35 is closed via the lower end portion 31. At this time, it is preferable that the lower end portion 31 is pressed against the surface of the concave portion 222 (the bottom surface 22).
Thereafter, the lower end portion 31 is formed into a substantially flat mass attached to the label surface 3a by plastic deformation, and the closed portion 32 is placed in the space 28 as shown in FIG. A container 1 is obtained.
The pressing method is, for example, using a jig 11 having a flat top surface and pressing the lower end portion 31 of the tubular label 3 from below toward the bottom surface 22, which is crushed randomly, as shown in FIG. The closing part 32 can be formed. When the lower end 31 is pressed while rotating around the longitudinal axis using a jig 11 having an engaging portion (e.g., an uneven surface such as a file surface) that engages with the lower end 31 on the upper surface, the jig 11 becomes a twisted yarn. It can be crushed to form a closed portion 32 as shown in FIG. When the lower end portion 31 is sequentially pressed so as to be folded using a plurality of jigs 11, a closed portion 32 as shown in FIG. 2A can be formed.
[0032]
According to the above-described manufacturing method, the cylindrical label 3 is contracted, and the lower end 31 of the label 3, which is a non-attached portion generated after the contraction, is pressed toward the bottom surface 22 of the container 2. The light-shielding container 1 in which the portion 21 and the bottom surface 22 are covered with the light-shielding label 3 can be manufactured.
In particular, by pressing the bottom surface 22 toward the concave portion 222, the light-shielding container 1 in which the closed portion 32 is accommodated in the space 28 of the concave portion 222 can be easily manufactured.
Further, by pressing while the lower end portion 31 is softened due to residual heat at the time of thermal contraction, the lower end portion 31 can be plastically deformed and the lower opening 35 can be closed without providing a separate heating step. . However, in order to surely soften the lower end portion 31, the lower end portion 31 may be pressed using a heating device such as a heater for intensively heating the lower end portion 31.
[0033]
It should be noted that the present invention is not limited to the above-described embodiments, and appropriate configurations can be added, substituted, and design changed within the scope of the present invention. Hereinafter, different portions of the modified example of each of the above embodiments will be mainly described, and for similar configurations, terms and figures are referred to, and the description thereof may be omitted.
[0034]
(Other Embodiments of Label Base Material)
In the above-described embodiment, the label substrate 5 has the above-described effect because the black-based printing layer 8 is provided on the white-based film 7, but the white-based film without the black-based printing layer 8 is provided. The label base material 5 may be constituted by using 7. Further, the film constituting the label substrate 5 is not limited to the white film 7 and may be, for example, a red or dark film as exemplified in page 4 [0027]-[0030] of JP-A-2000-68202. The label substrate 5 may be configured using a light-shielding film formed by appropriately blending various colorants exhibiting blue or the like and an ultraviolet ray blocking agent such as an ultraviolet ray absorbing agent. Further, if necessary, the label substrate 5 may be formed by appropriately providing a black print layer 8 on the back surface and / or the surface corresponding to the bottom cover region 34 on the light-shielding film as in the above embodiment.
Furthermore, a light-shielding printing layer is provided on the back and / or front surface of the transparent film, on which a colorant exhibiting white, black, dark blue and the like and a blocking agent for ultraviolet and visible light such as an ultraviolet absorber are blended. A film may be used, or a laminated film in which a transparent film and a film mixed with a blocking agent such as ultraviolet rays may be used. In the case where only ultraviolet rays are blocked, the label substrate 5 may be composed of a substantially colorless transparent film containing an ultraviolet absorber or the like.
In the above embodiment, the design print layer 9 is provided on the front surface 7b of the film 7, but the design print layer 9 may be provided on the back surface 7a.
[0035]
(Other Embodiment of Blocking Part)
In the above embodiment, since the closing portion 32 is provided in the space 28 of the concave portion 222, it is preferable that the closing portion 32 does not protrude below the grounding portion 221. For example, FIG. As shown, the closing portion 32 may be provided outside the space 28 and at a position corresponding to the concave portion. If the closing portion 32 is provided at the position corresponding to the concave portion, when the light-shielding container 1 is made to stand on its own, the closing portion 32 fits into the concave portion 22 due to the bending of the label 3 (indicated by a two-dot chain line). Can be secured.
[0036]
(Other Embodiment of Container)
In the above embodiment, the container 2 has a flat shape in which the ground portion 221 is continuously connected in the circumferential direction. For example, as shown in FIG. You may apply to the container 2 in which several convex parts are protruded and the lower end surface of this convex part was made into the ground part 221. In addition, in the container 2, a concave portion 222 concaved inward is formed between adjacent convex grounding portions 221.
[0037]
(Another embodiment of a method for manufacturing a light-shielding container)
In the above embodiment, it is preferable that at least the lower end portion 31 of the tubular label 3 is pressed by the residual heat after the heat shrinkage while the lower end portion 31 is softened to close the lower opening portion 35. Then, it may be pressed. Further, these means are preferable because the lower opening 35 can be closed only by pressing. However, it is also possible to close the lower opening 35 of the tubular label 3 using, for example, a solvent or an adhesive.
[0038]
【The invention's effect】
As described above, the light-shielding container according to the present invention can more reliably prevent transmission of ultraviolet light and the like, and can separate the light-transmitting container only by removing the cylindrical label at the time of recycling. Further, the light-shielding container can be made independent without any trouble, and the appearance is beautiful.
Furthermore, the light-shielding container in which the closing portion that closes the lower opening is located in the space defined by the concave portion has excellent self-standing stability, and does not lower the commercial value because dirt and the like hardly adhere during transportation. Further, it is possible to prevent the closing portion from being carelessly hooked on an obstacle.
Further, in the light-shielding container in which the closed portion is formed so that the lower end portion of the cylindrical label is fitted and is formed substantially flat by plastic deformation, the closed portion is not bulky, and the lower opening portion is closed due to vibration during transportation. Reopening can be prevented.
[0039]
Furthermore, the method for manufacturing a light-shielding container according to the present invention can easily manufacture a light-shielding container in which the body and bottom surface of the container are covered with a light-shielding label.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a light-shielding container according to the present invention, including a longitudinal section in which a right half is shown as a section along a central axis in a longitudinal direction.
FIGS. 2 (a) to 2 (d) each show an embodiment of a closed portion of a light shielding container, and FIGS. 2 (a) -1 to (d) -1 are partially omitted longitudinal sectional views, and FIG. 2-2 (d) -2 is a plan reference view showing a state where the closing portion is viewed from the bottom side of the container.
FIG. 3 is a perspective view showing one embodiment of a tubular label before heat shrinkage.
FIG. 4 is a sectional view taken along line AA of FIG. 3;
FIG. 5 is a longitudinal sectional view showing an insertion step in the method for manufacturing a light-shielding container.
FIG. 6 is a longitudinal sectional view showing the heat shrinking step.
FIG. 7 is a longitudinal sectional view showing the closing step.
8 (a) and 8 (b) are partially omitted longitudinal sectional views showing another embodiment of the light shielding container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Light shielding container, 2 ... Light transmissive container, 21 ... Container trunk, 22 ... Container bottom, 221 ... Bottom grounding part, 222 ... Bottom recess, 3 ... Heat-shrinkable cylindrical label, 3a ... Label Front surface, 31: lower end portion of cylindrical label, 32: closing portion, 33: body covering region of cylindrical label, 34: bottom surface covering region of cylindrical label, 35: lower opening portion, 36: ground portion mounting portion, 5: label base material, 6: perforation, 7: film, 8: black print layer, 9: design print layer, 11: jig

Claims (6)

A light-transmitting container (2) having a bottom surface (22) on which a body portion (21) and a ground portion (221) for self-supporting are formed; and a body portion (21) and a bottom surface (22) of the container (2). And a light-shielding heat-shrinkable tubular label (3) that can cover the body (21) of the container (2) by heat shrinkage, and a grounding portion. (221) The light-shielding member is mounted along the shape of (221), and a lower opening (35) of the cylindrical label (3) is closed by a bottom surface (22) of the container (2). container. A concave portion (222) recessed inward is formed in the bottom surface (22) of the container (2), and the grounding portion mounting portion (36) of the cylindrical label (3) is attached to the grounding portion (221). The inside of the space (28) which is gradually shrunk inward toward the inside and which closes the lower opening (35) of the tubular label (3) is closed by the recess (222). The light-shielding container according to claim 1, wherein the light-shielding container is provided in a container. The light-shielding container according to claim 2, wherein the closing portion (32) is formed by aligning a lower end portion (31) of the cylindrical label (3) and forming it into a substantially flat shape by plastic deformation. A heat-shrinkable cylindrical label (3) having a length capable of covering the body (21) and the bottom surface (22) of the container (2), which is a light-shielding label, is attached to the body (2) of the container (2). 21) and an insertion step of inserting the cylindrical label (3) in a state of protruding downward from the bottom surface (22), a heat shrinking step of heat shrinking the cylindrical label (3), and after the heat shrinking, the container The lower end (31) of the cylindrical label (3) projecting downward from the bottom surface (22) of (2) is pressed toward the bottom surface (22) of the container (2) to open the lower part of the cylindrical label (3). A method for manufacturing a light-shielding container, comprising a closing step of closing a portion (35). The method for manufacturing a light-shielding container according to claim 4, wherein the closing step presses the lower end portion (31) of the tubular label (3) while the lower end portion (31) is softened due to residual heat of heat shrinkage. A concave portion (222) recessed inward is formed in the bottom surface (22) of the container (2), and the closing step is performed in the space (28) defined by the concave portion (222). The method according to claim 4 or 5, wherein the lower opening (35) of the label (3) is pressed so as to be closed.

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