JP2018001651A - In-mold label and in-mold label container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-mold label that has no need to provide a white or black printed layer in addition to a heat seal layer and can cut cost, and to provide an in-mold label container.SOLUTION: An in-mold label 10 comprises a transparent base material layer 11 made of polypropylene, a heat seal printed layer 12 disposed in the inside of the base material layer 11 and to adhere to a container body 2 and a pattern printed layer 13 between the base material layer 11 and the heat seal printed layer 12. The heat seal printed layer 12 includes titanium oxide and a chlorinated polypropylene. The heat seal printed layer 12 can function as a ground layer for the pattern printed layer 13 when viewed from the side of the base material layer 11. The concentration of titanium oxide contained in the heat seal printed layer 12 is not less than 5 wt.% to not more than 28 wt.%.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an in-mold label and an in-mold label container.

  Conventionally, as cup-shaped containers for sealing and packaging various beverages, dessert foods and the like, cup-shaped containers by plastic injection molding are often used because the containers have good shape retention. Furthermore, in order to improve the designability and light hiding property, an in-mold label having a base material layer and an adhesive layer composed of a thermoplastic resin is used at the time of injection molding of the container. An in-mold label container obtained by injecting is known.

JP 2006-206162 A JP-A-9-295383

  In patent document 1, the base material which consists of a synthetic resin single layer film which can be directly heat-welded with the wall surface of a container is embossed.

  However, in an in-mold label for multicolor gravure printing, when embossing is performed on the in-mold label as in Patent Document 1, an operation different from the printing process is required. In this case, the cost increases due to an increase in the number of work steps.

  Moreover, in patent document 2, the white or black heat-seal layer which consists of a thermoplastic resin which has light hiding property is provided in the back surface side of the base material layer.

  However, when providing a printing layer that uses a white or black color in addition to the heat seal layer as in Patent Document 2, the number of printing units that can be used in a multi-color printing machine is limited, so that colors that can be used are used. There is a possibility that the design property by printing is reduced. Further, in order to secure the number of colors to be used, it is necessary to reprint the in-mold label again through the multicolor printer. In this case, the cost increases due to an increase in the printing process.

  The present invention has been made in consideration of the above points, and provides an in-mold label and an in-mold label container that can reduce the cost without the need to provide a white or black printing layer in addition to the heat seal layer. The purpose is to do.

  The present invention provides an in-mold label for an in-mold label container that is adhered to the outer surface of a container body molded by injection molding, and is disposed inside a transparent base layer made of polypropylene and the base layer, A heat seal printing layer adhered to a container body, and a pattern printing layer disposed between the base material layer and the heat seal printing layer, the heat seal printing layer comprising titanium oxide and chlorinated Polypropylene, and the heat seal print layer functions as a base layer for the pattern print layer when viewed from the base material layer side, and the concentration of titanium oxide contained in the heat seal print layer is It is an in-mold label characterized by being 5 wt% or more and 28 wt% or less.

  The present invention is the in-mold label, wherein the pattern printing layer is a multicolor printing layer.

  The present invention is the in-mold label, wherein the concentration of titanium oxide contained in the heat seal printing layer is 15% by weight or more.

  The present invention is an in-mold label container comprising the in-mold label according to the present invention and the container body.

  As described above, according to the present invention, the heat seal printing layer contains titanium oxide, and the concentration of titanium oxide is 5% by weight or more and 28% by weight or less. Therefore, the heat seal printing layer can be brought close to white. . Further, by bringing the heat seal print layer close to white, the heat seal print layer functions as a base layer for the pattern print layer when viewed from the base material layer side. For this reason, it is not necessary to separately provide a white print layer in addition to the heat seal print layer as a base layer of the pattern print layer. Thereby, the printing process of a white printing layer can be omitted compared with the case where a white printing layer is separately provided.

FIG. 1 is a longitudinal sectional view showing an in-mold label container according to the present embodiment. FIG. 2 is a rear view showing the in-mold label container shown in FIG. FIG. 3 is a development view showing the outer shape of the in-mold label according to the present embodiment. FIG. 4 is a diagram showing a layer structure of the in-mold label shown in FIG.

  Embodiments of an in-mold label and an in-mold label container according to the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view showing an in-mold label container, and FIG. 2 is a rear view of the in-mold label container shown in FIG. FIG. 3 is a developed view showing the outer shape of the in-mold label, and FIG. 4 is a diagram showing the layer structure of the in-mold label shown in FIG.

  As shown in FIGS. 1 and 2, the in-mold label container 1 includes a container body 2 formed by injection molding and an in-mold label 10 bonded to the outer surface of the container body 2. Among these, the container body 2 includes a trunk portion 3, a flange portion 4 provided at the upper end of the trunk portion 3, a bottom portion 5 provided at the lower end of the trunk portion 3, and legs that are provided at the periphery of the bottom portion 5 and project downward. Part 6.

  An in-mold label 10 for an in-mold label according to the present invention is bonded to the outer peripheral surface side of the body portion 3. A stack rib 8 is provided at a lower portion of the body 3.

  And the part except the in-mold label 10 among the trunk | drum 3, the flange part 4, the bottom part 5, and the leg part 6 is injection resin obtained by injecting injection resin in an injection molding die (not shown). Part 7. In addition, although the leg part 6 is provided on extension of the trunk | drum 3, the in-mold label 10 may reach to the leg part 6. FIG.

  Next, the part excluding the in-mold label 10 in the body part 3, the injection resin material of the injection resin part 7 constituting the flange part 4, the bottom part 5 and the leg part 6, and the in-mold label 10 will be described.

  As an injection resin material for forming the injection resin portion 7, a synthetic resin such as polyethylene, polyethylene terephthalate, polystyrene, or polypropylene can be used.

  Next, the in-mold label 10 will be described with reference to FIGS. 3 and 4. As shown in FIG. 3, the in-mold label 10 has a fan shape, and the upper and lower corners of both end portions 10a and 10b of the in-mold label 10 are chamfered with a small R shape.

  As shown in FIG. 1, the length of the in-mold label 10 in the height direction preferably slightly protrudes from the flange portion 4 above the trunk portion 3 and reaches the middle portion of the leg portion 6 below. Moreover, as shown in FIG. 2, the circumferential length of the in-mold label 10 is such that a gap 10A having a width of about 0.2 to 2.0 mm is generated between both end portions 10a and 10b that are abutted with each other. It is preferable that the length is about. By forming such an in-mold label 10, the in-mold label 10 is inserted into a predetermined position of a female mold of an injection mold (not shown), fixed by vacuum suction, and after closing the mold, the injection resin is placed at the bottom of the female mold. When injecting from the gate at the center of the in-mold, it is possible to prevent the in-mold label 10 from causing defects such as an overlapped portion, turn-up, and wrinkle. At this time, the injection resin can be injected smoothly, and the in-mold label 10 and the injection resin can be integrally formed.

  Next, the in-mold label 10 according to the present embodiment will be described. As shown in FIG. 4, the in-mold label 10 includes a base material layer 11, a heat seal print layer 12 disposed inside the base material layer 11, and the base material layer 11 and the heat seal print layer 12. And an arranged pattern printing layer 13. Among these, the base material layer 11 includes a transparent layer made of polypropylene. More specifically, a stretched polypropylene film is used as the base material layer 11. Moreover, the thickness of the base material layer 11 is set to 60 μm.

  Further, a mat-like mat overprint layer (mat OP layer) 14 that protects the base material layer 11 is provided outside the base material layer 11. As the mat overprint layer 14, an acrylic resin mat varnish can be used.

  The heat seal printing layer 12 is a layer that is bonded to the container body 2 when the in-mold label container 1 is injection molded. The heat seal printing layer 12 contains titanium oxide and chlorinated polypropylene. Moreover, the density | concentration of the titanium oxide contained in the heat seal printing layer 12 is 5 to 28 weight%.

  Here, when the concentration of titanium oxide contained in the heat seal print layer 12 is less than 5% by weight, the heat seal print layer 12 does not exhibit an effect as a base layer of the picture print layer 13, and the substrate layer 11 side. There exists a malfunction that the designability of the pattern printing layer 13 when it sees from falls. On the other hand, when the concentration of titanium oxide contained in the heat seal print layer 12 exceeds 28% by weight, the adhesiveness between the picture print layer 13 and the heat seal print layer 12 is deteriorated, and ink is applied to the picture print layer 13. There is a problem that printing failure such as missing occurs. On the other hand, according to the present embodiment, since the concentration of titanium oxide contained in the heat seal print layer 12 is 5% by weight or more, the color of the heat seal print layer 12 can be brought close to white. Thereby, when the heat seal printing layer 12 is seen from the base material layer 11 side, it functions as a base layer with respect to the pattern printing layer 13, and can improve the design property. Moreover, since the density | concentration of the titanium oxide was 28 weight% or less, the adhesive fall between the heat seal printing layer 12 and the pattern printing layer 13 can be suppressed. For this reason, generation | occurrence | production of a printing defect can be reduced. Furthermore, the concentration of titanium oxide is preferably 15% by weight or more. Thus, by setting the concentration of titanium oxide to 15% by weight or more, the color of the heat seal printing layer 12 can be made closer to white. Thereby, the register mark for punching formed by the pattern printing layer 13 can be made conspicuous. For this reason, when punching the in-mold label 10 into the shape shown in FIG. 3, the accuracy of registration can be improved. Moreover, the register mark for printing formed by the pattern printing layer 13 can also be made conspicuous. The punching registration mark and the printing registration mark will be described later. As the heat seal printing layer 12, a chlorinated polypropylene resin-based ink can be used. Moreover, since the heat seal printing layer 12 is a layer bonded to the injection resin, it is preferable to include the same material as the injection resin.

    The heat seal printing layer 12 and the pattern printing layer 13 are formed by a plurality of printing units of a multicolor printing machine, and the pattern printing layer 13 is printed in a plurality of colors. As the pattern print layer 13, an ink having a normal pigment can be used. For example, a urethane resin ink can be used.

  Next, a method for manufacturing the in-mold label 10 will be described.

  First, a transparent base material layer 11 made of a stretched polypropylene film is prepared.

  Next, the pattern printing layer 13 is laminated on the base material layer 11. In this case, the pattern printing layer 13 is formed by using a plurality of printing units (not shown) of a multicolor printing machine (multicolor gravure printing machine, not shown). That is, the multicolor printing machine includes a plurality of printing units that print different colors on the base material layer 11 that is continuously conveyed. In this case, the first printing unit is the first color printing unit of the pattern printing layer 13, the second printing unit is the second color printing unit, and the third printing unit is the third color printing unit. .

  For example, when the multicolor printing machine includes nine printing units, the pattern printing layer 13 is printed on the base material layer 11 by the first to seventh printing units. Further, when the printing unit prints the pattern printing layer 13, a register mark is provided on the pattern printing layer 13. The registration mark includes a printing registration mark for multicolor printing and a punching registration mark used for registration when the in-mold label 10 is punched. Among these, a printing register mark is provided together with a pattern for each color of the pattern printing layer 13 by each printing unit. And the registration at the time of forming the pattern printing layer 13 is performed by the printing registration mark provided for every color of the pattern printing layer 13. The punching registration mark does not need to be provided for each color of the pattern print layer 13, and the punching registration mark can be provided by one printing unit.

  Next, the heat seal printing layer 12 is formed by being laminated on the pattern printing layer 13 printed in a plurality of colors. In this case, the heat seal printing layer 12 is transferred to the pattern printing layer 13 by the printing unit (for example, the eighth printing unit) next to the printing unit (for example, the seventh printing unit) on which the pattern printing layer 13 is printed last. It is formed by stacking on top. As described above, the concentration of titanium oxide contained in the heat seal printing layer 12 is 5% by weight or more and 28% by weight or less. Thereby, the heat seal printing layer 12 can be brought close to white. For this reason, the white printing process which functions as a base layer of the pattern printing layer 13 in the printing process of the pattern printing layer 13 can be omitted. In addition, the amount of white ink used can be reduced as compared with a case where a white solid layer of white ink is laminated on the pattern printing layer 13.

  Next, the mat overprint layer 14 is formed by being laminated on the base material layer 11. At this time, the substrate layer 11 and the pattern printing layer are placed on the printing unit (the last printing unit, for example, the ninth printing unit) next to the printing unit (for example, the eighth printing unit) for forming the heat seal printing layer 12. Before the laminated body of 13 and the heat seal printing layer 12 enters, the laminated body is inverted once. Next, the matte overprint layer 14 is laminated on the base material layer 11 by the next printing unit.

  Thereafter, the laminated body of the mat overprint layer 14, the base material layer 11, the pattern print layer 13, and the heat seal print layer 12 is dried in a drying process, and then used as a registration mark for punching provided on the pattern print layer 13. By punching with a punching device (not shown), the in-mold label 10 is obtained.

  Thus, according to this Embodiment, since the density | concentration of the titanium oxide contained in the heat seal printing layer 12 is 15 to 28 weight%, the heat seal printing layer 12 can be brought close to white. . Thereby, the white printing process which functions as a base layer of the pattern printing layer 13 in the printing process of the pattern printing layer 13 can be omitted. For this reason, the number of colors used in the printing process of the pattern printing layer 13 can be suppressed, and the printing process can be completed by a single printing process by one multicolor printer. That is, it is not necessary to reprint the in-mold label 10 through a separate multicolor printer in order to secure the number of colors used for the pattern printing layer 13. For this reason, a printing process does not increase and cost increase can be suppressed. As a result, the manufacturing process can be simplified and the cost can be reduced.

  Moreover, in the printing process of the pattern printing layer 13, the white printing process which functions as a base layer of the pattern printing layer 13 can be omitted, and more color printing can be applied to the pattern printing layer 13. Further, as described above, the white heat seal print layer 12 functions as a base layer for the picture print layer 13 when viewed from the base material layer 11 side. Thereby, the designability can be improved.

  Moreover, since the density | concentration of the titanium oxide contained in the heat seal printing layer 12 is preferably 15 weight% or more, the color of the heat seal printing layer 12 can be brought close to white. As a result, the register mark provided on the pattern print layer 13 can be made conspicuous. For this reason, it is possible to improve the registration accuracy when the in-mold label 10 is punched out.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

Example 1
As Example 1, an in-mold label 10 having the following configuration was manufactured using a multicolor printing machine including nine printing units.
(Outside) Matt overprint layer / base material layer (60 μm) / pattern print layer (7 layers)) / heat seal print layer (titanium oxide content 28 wt%)
In this case, the base material layer 11 made of a stretched polypropylene film having a thickness of 60 μm was used. Next, on the base material layer 11, a seven-pattern print layer 13 composed of seven color print layers was formed using urethane resin-based ink. Next, the heat seal printing layer 12 was formed on the pattern printing layer 13 using chlorinated polypropylene resin-based ink. The heat seal printing layer 12 contains 28% by weight of titanium oxide. Then, the mat | matte overprint layer 14 was formed on the base material layer 11 on the opposite side to the side which laminated | stacked the pattern printing layer 13. FIG.

  Then, the appearance of the pattern printing layer 13 when viewed from the base material layer 11 side, the adhesiveness between the pattern printing layer 13 and the heat seal printing layer 12, and the number of printing steps were evaluated. The results are shown in Table 1.

(Example 2)
As Example 2, only the titanium oxide content was changed, and the in-mold label 10 similar to Example 1 was produced for the other components. That is, as Example 2, an in-mold label 10 having the following configuration was manufactured using a multicolor printing machine including nine printing units.
(Outside) Matt overprint layer / base material layer (60 μm) / pattern print layer (7 layers)) / heat seal print layer (titanium oxide content 15% by weight)
In this case, the base material layer 11 made of a stretched polypropylene film having a thickness of 60 μm was used. Next, on the base material layer 11, a seven-pattern print layer 13 composed of seven color print layers was formed using urethane resin-based ink. Next, the heat seal printing layer 12 was formed on the pattern printing layer 13 using chlorinated polypropylene resin-based ink. The heat seal printing layer 12 contains 15% by weight of titanium oxide. Then, the mat | matte overprint layer 14 was formed on the base material layer 11 on the opposite side to the side which laminated | stacked the pattern printing layer 13. FIG. Then, evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1)
As Comparative Example 1, only the titanium oxide content was changed, and the other components were the same in-mold label 10 as in Example 1. That is, as Comparative Example 1, an in-mold label 10 having the following configuration was manufactured using a multicolor printing machine including nine printing units.
(Outside) Matt overprint layer / base material layer (60 μm) / pattern print layer (7 layers)) / heat seal print layer (titanium oxide content 1% by weight)
In this case, the base material layer 11 made of a stretched polypropylene film having a thickness of 60 μm was used. Next, on the base material layer 11, a seven-pattern print layer 13 composed of seven color print layers was formed using urethane resin-based ink. Next, the heat seal printing layer 12 was formed on the pattern printing layer 13 using chlorinated polypropylene resin-based ink. The heat seal printing layer 12 contains 1% by weight of titanium oxide. Then, the mat | matte overprint layer 14 was formed on the base material layer 11 on the opposite side to the side which laminated | stacked the pattern printing layer 13. FIG. Then, evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 2)
As Comparative Example 2, an in-mold label 10 similar to that of Example 1 was produced except that the titanium oxide content and the number of the pattern printing layers 13 were changed. That is, as Comparative Example 2, an in-mold label 10 having the following configuration was manufactured using a multicolor printing machine including nine printing units.
(Outside) Matt overprint layer / base material layer (60 μm) / pattern print layer (8 layers)) / heat seal print layer (titanium oxide content 0 wt%)
In this case, the base material layer 11 made of a stretched polypropylene film having a thickness of 60 μm was used. Next, on the base material layer 11, an eight-pattern print layer 13 composed of eight color print layers was formed using urethane resin-based ink. That is, the pattern printing layer 13 in Comparative Example 2 was formed by adding a white solid layer of white ink to the pattern printing layers 13 in Examples 1 and 2 and Comparative Example 1. Next, the heat seal printing layer 12 was formed on the pattern printing layer 13 using chlorinated polypropylene resin-based ink. The heat seal printing layer 12 does not contain titanium oxide. Then, the mat | matte overprint layer 14 was formed on the base material layer 11 on the opposite side to the side which laminated | stacked the pattern printing layer 13. FIG. Then, evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

  In Table 1, the ◯ mark indicates that the appearance of the pattern printing layer 13 is good when viewed from the base material layer 11 side, and the adhesiveness between the pattern printing layer 13 and the heat seal printing layer 12 is good. Alternatively, it shows that the printing process can be completed by one printing process by one multi-color printing machine. On the other hand, the mark x indicates that the design printing layer 13 does not look good when viewed from the base material layer 11 side, or the printing process cannot be completed by a single printing process by one multicolor printer. It is shown that. In addition, when the density | concentration of the titanium oxide contained in the heat seal printing layer 12 was 30 weight% or more, the adhesiveness between the pattern printing layer 13 and the heat seal printing layer 12 was bad, and the printing defect had arisen. . Moreover, when the density | concentration of the titanium oxide contained in the heat seal printed layer 12 is lower than 5 weight%, the heat seal printed layer 12 does not exhibit the effect as a base layer of the pattern printed layer 13, and a base material layer The appearance of the pattern printing layer 13 when viewed from the 11th side was poor.

  As shown in Table 1, when the concentration of titanium oxide contained in the heat seal printing layer 12 is 15% by weight or more and 28% by weight or less, the pattern printing is viewed from the substrate layer 11 side. It was confirmed that the appearance of the layer 13 and the adhesion between the pattern printing layer 13 and the heat seal printing layer 12 could be improved. In addition, the number of colors used in the printing process of the pattern printing layer 13 is reduced by omitting the white printing process that functions as the base layer of the pattern printing layer 13 in the printing process of the pattern printing layer 13, thereby reducing the number of printing units. It was confirmed that the printing process could be completed by a single printing process by one multi-color printing machine including

DESCRIPTION OF SYMBOLS 1 In-mold label container 2 Container body 10 In-mold label 11 Base material layer 12 Heat seal printing layer 13 Picture printing layer

Claims (4)

In an in-mold label for an in-mold label container that is adhered to the outer surface of a container body molded by injection molding,
A transparent base material layer made of polypropylene,
A heat seal printing layer disposed inside the substrate layer and adhered to the container body;
A pattern printing layer disposed between the base material layer and the heat seal printing layer,
The heat seal printing layer includes titanium oxide and chlorinated polypropylene,
The heat seal printing layer functions as a base layer for the pattern printing layer when viewed from the base material layer side,
The in-mold label characterized in that the concentration of titanium oxide contained in the heat seal printing layer is 5 wt% or more and 28 wt% or less.   The in-mold label according to claim 1, wherein the pattern printing layer is a multicolor printing layer.   The in-mold label according to claim 1 or 2, wherein the concentration of titanium oxide contained in the heat seal printing layer is 15 wt% or more.   The in-mold label container provided with the in-mold label as described in any one of Claims 1 thru | or 3, and the said container main body.

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