WO2019069700A1

WO2019069700A1 - In-mold label, in-mold molded article, and method for producing in-mold molded article

Info

Publication number: WO2019069700A1
Application number: PCT/JP2018/034827
Authority: WO
Inventors: 智仁市来; 早紀松本; 泰正奥野; 稔阿由葉; 橋本　健司; 学松崎
Original assignee: バンドー化学株式会社; 日清食品ホールディングス株式会社
Priority date: 2017-10-04
Filing date: 2018-09-20
Publication date: 2019-04-11
Also published as: JP7088651B2; TW201933300A; JP2019064230A

Abstract

The present invention provides an in-mold label capable of suppressing the occurrence of large and small wrinkles and resin wraparound. The present invention is an in-mold label provided with slits extending along a first direction and equipped with 10 or more band-shaped divided parts formed by the slits, wherein the slits are arranged along a second direction and include first slits and second slits having a length of 20-95% with respect to the length of the first slits, and the distance between the first slits and the second slits is preferably 2-35 mm inclusive.

Description

In-mold label, in-mold molded article, and method of manufacturing in-mold molded article

The present invention relates to an in-mold label, an in-mold molded article provided with the in-mold label, and a method for producing an in-mold molded article using the in-mold label.

In-mold molding is used as one of the methods of giving decoration etc. to the surface of a molded article. The above-mentioned in-mold molding is a manufacturing method in which the label is integrated with the surface of a molded article by setting a label subjected to printing or the like in advance in a mold and then filling the resin composition in the mold.

Various studies have been conducted on the shape of a label used in in-mold molding (hereinafter, also referred to as in-mold label). For example, Patent Document 1 discloses a horizontally-long strip type provided with a printing base layer and an adhesive layer. In the fan-shaped in-mold label, the base side is a connection portion by disposing at least one portion of the vertical direction portion of the base portion with a large number of separation lines to the one portion with the portion extending over the entire width as a base An in-mold label is disclosed, which is characterized in that the label is formed of a plurality of adjacent strips with the upper end to the lower end of the label as the free end.

Unexamined-Japanese-Patent No. 2006-123446

When the base having the curved surface portion and the in-mold label are integrated, it is difficult to make the in-mold label along the curved surface portion, and it is easy to generate molding defects such as wrinkles in the curved surface portion. Therefore, in the conventional in-mold molded product, in-mold molding is mainly performed by arranging an in-mold label in a mold so as not to overlap with the curved surface portion of the above-mentioned base material.

In recent years, from the viewpoint of enhancing the design, there is a demand for applying a wider range of decoration from the bottom surface of the base material to the upper end of the side surface. However, if in-mold molding is performed so that the curved portion of the substrate and a part of the in-mold label overlap, the end of the in-mold label is curled up, and large wrinkles are generated or curled up in the in-mold label There was a case where the resin composition was rolled around the outside of the in-mold label from the part. According to the study of the present inventors, the above problems are (1) when the in-mold label is applied to a substrate having a curved surface, the in-mold label is sufficiently in the curved surface of the cavity of the mold. It is considered that the adhesion does not occur, and the resin composition leaks from the gap between the in-mold label and the mold. Further, (2) it is considered that the end of the in-mold label is bent when the in-mold label collides with the molten resin composition flowing at high speed from the resin injection port. FIG. 11 is an enlarged schematic plan view of the band-like divided portion, which illustrates the occurrence of large wrinkles resulting from the end-end curling up. The white arrow in FIG. 11 indicates the inflow direction of the resin composition. As shown in FIG. 11, in the conventional in-mold label 200, the strip-like divided portion 202 is turned up by the resin composition flowing in from the end of the strip-like divided portion 202 formed by the cut 201, and large wrinkles 203 are generated. Do.

In the patent document 1, the in-mold label is attached to the curved surface portion of the surface of the container body by forming a plurality of adjacent strip pieces on the in-mold label, and a good-looking in-mold label container without wrinkles is provided. It is being considered. However, when the inventor observed the wrinkles generated in the in-mold label molded article in more detail, in addition to the large wrinkles generated due to the end of the in-mold label turning up, the in-mold label further It was found that small wrinkles were generated at the deepest position of the incision formed in. The small wrinkles generated at the deepest position of the incision can not be resolved by merely inserting the incision in the in-mold label as disclosed in the above-mentioned Patent Document 1, and there is room for further study. In the present specification, the deepest position of the cut refers to the end point of the cut when the end of the band-shaped divided portion is the starting point.

This invention is made in view of the said present condition, and the in-mold label which can suppress generation | occurrence | production of large and small wrinkles and resin wrap-around, the manufacturing method of the in-mold molded article using this in-mold label, and It is an object of the present invention to provide an in-mold molded article having a good appearance without the occurrence of large and small wrinkles and resin wraparound.

The present inventors examined the influence of the number of cuts made at one end of the in-mold label in order to suppress the end of the in-mold label from turning up during molding. As a result, it was found that by increasing the number of incisions and providing ten or more strip-shaped divisions, it is possible to suppress the occurrence of large wrinkles and resin wrap-around due to the end of the in-mold label turning up. .

On the other hand, the present inventors found that when the number of incisions was increased, small wrinkles were likely to be generated at the deepest position of the incisions, and examined the causes of the small wrinkles. FIG. 12 is an enlarged schematic plan view of the band-like divided portion for explaining the occurrence of small wrinkles at the deepest position of the incision. When performing in-mold molding, as shown in FIG. 12, the in-mold label 200 is pulled in both directions along the curved surface of the substrate as indicated by the outline arrows. At this time, since the stress is concentrated at the deepest position of the incision 201, it was found that the small wrinkles 204 are generated. Furthermore, it has been found that the above-mentioned small wrinkles are more likely to occur as the distance between the adjacent notches becomes narrower.

The inventors of the present invention repeated studies, and by providing ten or more strip-shaped divisions at one end of the in-mold label, while suppressing the occurrence of the above-mentioned large wrinkles and the resin wrap-around, and cutting with different lengths. By inserting it, the distance between the adjacent incisions can be extended, and it has been found that the generation of the small wrinkles can be suppressed, and the present invention has been completed.

One embodiment of the present invention is an in-mold label provided with a notch extending along a first direction and including ten or more strip-shaped divided portions formed by the above-mentioned notch, the notch being along a second direction It is an in-mold label characterized in that it comprises a first incision and a second incision having a length of 20 to 95% with respect to the length of the first incision.

The distance between the first incision and the second incision is preferably 2 mm or more and 35 mm or less.

The shapes of the first incision and the second incision are preferably linear or V-shaped with the end side diverging.

The length of the first incision is preferably 3% or more and 80% or less with respect to the length in the first direction of the in-mold label.

Another embodiment of the present invention comprises a resin base material and the in-mold label of the present invention attached to the outer surface of the resin base material, wherein the resin base material has a curved surface portion, and the curved surface It is an in-mold molded article characterized in that at least a part of the portion and the strip-shaped divided portion of the in-mold label overlap.

The resin base material is a container having a bottom surface and a side surface, and the upper side of the bottom surface is open. The curved surface portion is disposed between the bottom surface and the side surface, and the curvature radius of the curved surface portion is It is preferable that they are 10 mm or more and 50 mm or less.

According to still another embodiment of the present invention, a mold having a resin injection port in one of a concave and a convex mold is used, and the inside of the concave mold has the strip-shaped divided portion on the resin injection port side. A label disposing step of disposing the in-mold label of the invention, and a filling step of filling a resin composition from the resin inlet into the cavity formed between the concave and the convex. It is a manufacturing method of an in-mold molded article.

According to the in-mold label of the present invention and the method for producing an in-mold molded article of the present invention, it is possible to provide an in-mold molded article in which the occurrence of large and small wrinkles and the wraparound of resin are suppressed. The in-mold molded article of the present invention is a molded article having a good appearance without the occurrence of large and small wrinkles and resin wraparound.

5 is a schematic plan view showing the in-mold label according to the first example of Embodiment 1. FIG. 5 is a schematic plan view showing the in-mold label according to the second example of Embodiment 1. FIG. 5 is a schematic plan view showing the in-mold label according to the third example of Embodiment 1. FIG. 5 is a schematic plan view showing the in-mold label according to the fourth example of Embodiment 1. FIG. FIG. 7 is a schematic plan view showing an example of the in-mold label according to Embodiment 2. It is a schematic diagram which showed an example of the in-mold molded article of this invention, and is the perspective view observed from the bottom face. FIG. 7 is a schematic cross-sectional view taken along the line VV of the in-mold molded article shown in FIG. It is a plane schematic diagram of the in-mold molded article shown in FIG. It is the cross-sectional schematic diagram which showed an example of the metal mold | die used for manufacture of the in-mold molded article of this invention. It is the partially notched perspective view which showed typically the state which has arrange | positioned the in-mold label of this invention to the metal mold | die of FIG. It is an expansion plane schematic diagram of the strip | belt-shaped division part explaining generation | occurrence | production of the big wrinkles resulting from turning up of an edge part. It is an expansion plane schematic diagram of the strip | belt-shaped division part explaining generation | occurrence | production of the small wrinkles in the deepest position of incision.

<In-mold label>
Embodiment 1
FIG. 1 is a schematic plan view showing an in-mold label according to a first example of Embodiment 1. FIG. As shown in FIG. 1, the in-mold label 10A according to the first example (hereinafter also referred to as a label 10A) is provided with a cut extending along the first direction X, and ten or more strip shapes formed by the cut are provided. The dividing unit 1 is provided. The band divisions 1 are formed between the both ends of the label 10A and the incisions and between the adjacent incisions. By setting the number of the band-shaped divisions 1 to 10 or more, the label 10A can be arranged along the curved surface of the mold when the label 10A is arranged in the mold. It is possible to suppress the occurrence of large wrinkles caused by rising. Further, since the rigidity of the end portions of the respective strip-like divided portions 1 is improved and it becomes difficult to bend by making the incision finely, even if the resin composition is filled from the resin injection port, the end portions of the strip-like divided portions 1 are curled up It is possible to prevent the resin composition from flowing around the back side of the label. When the number of the band-shaped divided portions 1 is less than 10, the rigidity of the end portion of the band-shaped divided portion 1 is reduced, and when in-mold molding is performed, the generation of the large wrinkles and resin wrap around occur in the molded product.

The incisions are disposed along the second direction Y and include a first incision A and a second incision B having a length of 20 to 95% with respect to the length of the first incision A. In FIG. 1, L _X represents the length of the first direction X, L _A represents the length of the first cut A, and L _B represents the length of the second cut B. By providing the cuts having different lengths, it is possible to shift the deepest position of the cut and maintain the rigidity in the Y direction at the deepest position of the cut. As a result, the number of the band-shaped divided portions 1 can be increased to suppress the generation of the large wrinkles and the resin wraparound, and can also suppress the generation of small wrinkles generated at the deepest position of the incision.

The length L _B (hereinafter also referred to as L _B / L _A ) of the second cut B with respect to the length L _A of the first cut A is 20 to 95%. If the L _B / L _A is less than 20%, the rigidity of the end portion of the strip part 1 becomes insufficient, and when in-mold molding is performed, the generation of the large wrinkles and the resin wrap around the molded product Occur. This is because the L _B is too short with respect to the L _A, the effect of forming the second cut B is believed to be due to not sufficiently obtained. On the other hand, when L _B / L _A exceeds 95%, the rigidity in the second direction Y can not be maintained at the deepest position of the first cut A and the second cut B, so the above-mentioned small wrinkles Likely to happen. The preferable lower limit of the above L _B / L _A is 25%, the preferable upper limit is 85%, the more preferable upper limit is 70%, the still more preferable upper limit is 50%, and the particularly preferable upper limit is 40%.

The first direction X and the second direction Y extend in different directions. The length L _X of the first direction X of the label 10A, the length L _Y in the second direction Y, may be the same or different. If the aforementioned _{L X} and the _{L Y} are different may be longer which of the _{L X} and the _{L Y.} The above L _X and the above L _Y are not particularly limited, and can be appropriately changed according to the shape of the resin substrate to which the label 10 is attached. The _{L X} is, for example, 35 mm ~ 200 mm. The _LY is, for example, 150 mm to 600 mm. The first direction X is a direction along one side of the outer edge of the label 10A, and the second direction Y intersects the first direction X, and one side of the outer edge of the label 10A. Is a direction along a different side. The above-mentioned L _X, lower ends of the side where the strip division unit 1 of the label 10A is formed, when the upper ends of the opposite, lower end of the label 10A along the first direction X (strip It is the length from the end portion of the dividing portion 1 to the upper end. The above-mentioned L _Y, the ends of the band-like dividing portion 1 are formed side of the label 10A of (the lower end of the label 10) in length.

The shapes of the first incisions A and the second incisions B are preferably straight or V-shaped with the end (lower end) side spread. The shape of the first incision A and the shape of the second incision B may be the same or different. In the first embodiment, the case where the shapes of the first incision A and the second incision B are linear will be described.

The length L _A of the first cut A, the length L _X of the first direction X of the in-mold label, 3% or more and 80% or less. If the length L _A (hereinafter also referred to as L _A / L _X ) of the first cut A with respect to the length L _X in the first direction X is less than 3%, the lower end of the label 10A is gold because the cut is shallow Not along the surface of the mold, large wrinkles and resin wrap may occur. On the other hand, if L _A / L _X exceeds 80%, the incision is too deep, so that the label 10 may be broken when the label 10 is loaded into the mold cavity. The preferable lower limit of the above L _A / L _X is 5%, the preferable upper limit is 60%, the more preferable lower limit is 10%, and the more preferable upper limit is 55%.

The length L _B of the second cut B is the length L _X of the first direction X of the in-mold labels, 0.6% or more and 70% or less. If the length L _B (hereinafter also referred to as L _B / L _X ) of the second cut B with respect to the length L _X in the first direction X is less than 0.6%, the cut is shallow, so the end of the label 10A The portion (lower end) is not along the curved surface of the mold, and large wrinkles and resin wrap may occur. On the other hand, if L _B / L _X exceeds 70%, the incision is too deep, so that the label 10 may be broken when the label 10 is loaded into the mold cavity. The preferable lower limit of the above L _B / L _X is 3%, the preferable upper limit is 50%, the more preferable lower limit is 5%, the more preferable upper limit is 40%, and the still more preferable upper limit is 35% The particularly preferred upper limit is 30%.

The distance between the first incision A and the second incision B is preferably 2 mm or more and 35 mm or less. If the distance is less than 2 mm, the deepest positions of adjacent cuts are close, the rigidity in the Y direction at the deepest positions of the cuts is reduced, and small wrinkles may occur at the deepest positions of the cuts. On the other hand, if the distance exceeds 35 mm, the rigidity of the end portion of the strip-shaped divided portion 1 decreases, and large wrinkles and resin wrap may occur due to the end of the strip-shaped divided portion 1 being curled up. There is. The distance between the first incision A and the second incision B corresponds to the width of the strip-shaped divided portion formed by the first incision A and the second incision B. It is preferable that the width | variety of the strip | belt-shaped divided part formed of all the said 1st notch A and 2nd notch B with which the label 10 is 2 mm-35 mm is preferable.

As an arrangement pattern of the first incision A and the second incision B, as shown in FIG. 1, the first incision A and the second incision B are alternately disposed along the second direction Y. Placement patterns are included. By arranging in this way, even if the number of strip divisions 1 is increased, the rigidity in the Y direction at the deepest position of the incision is maintained by shifting the deepest position of the adjacent incisions, and generation of small wrinkles Can be effectively suppressed. The first incisions A and the second incisions B are preferably arranged alternately at equal intervals.

As another arrangement pattern, as shown in FIGS. 2 and 3, an arrangement pattern including a repetitive pattern in which at least one of the first incision A and the second incision B is continuously arranged along the second direction Y. Can be mentioned. The repeating pattern may be included at least once along the second direction Y of the in-mold label, and all the band-shaped divided portions may not be configured by the repeating pattern. The number of consecutive first incisions A and the number of consecutive second incisions B are preferably two or more and five or less. The distance between adjacent first cuts A when the first cuts A are arranged consecutively, and between the adjacent second cuts B when the second cuts B are arranged consecutively The distance may be the same as or different from the distance between the first incision A and the second incision B.

In any of the above arrangement patterns, it is preferable that an interval between adjacent notches be 2 mm or more and 35 mm or less. Moreover, it is preferable that the space | interval between the said adjacent notches is equal intervals. Furthermore, it is preferable that the width | variety of all the strip | belt-shaped division parts 1 with which the label 10 is provided is 2 mm or more and 35 mm or less.

FIG. 2 is a schematic plan view showing the in-mold label according to the second example of the first embodiment. As shown in FIG. 2, the in-mold label 10B according to the second example (hereinafter, also referred to as a label 10B) has the first incision A and the second incision B twice each along the second direction Y. And a repetitive pattern P1 sequentially arranged. FIG. 3 is a schematic plan view showing the in-mold label according to the third example of the first embodiment. As shown in FIG. 3, in the in-mold label 10C according to the third example (hereinafter, also referred to as a label 10C), the first cut A is once and the second cut B is along the second direction Y. It includes a repeated pattern P2 arranged two consecutive times. Even when the repetitive pattern P1 shown in FIG. 2 and the repetitive pattern P2 shown in FIG. 3 are included, the first cut A and the second cut B shown in FIG. 1 are alternately arranged. Similarly to the above, the generation of large and small wrinkles and the wraparound of the resin can be suppressed. From the viewpoint of suppressing small wrinkles more effectively, it is more preferable to arrange the first incisions A and the second incisions B alternately.

The entire shape of the in-mold label of the present invention can be appropriately changed depending on the shape of the molded product, but it may have two sides extending in the first direction X and two sides extending in the second direction Y. . The strip-like divided portion 1 is provided on one side of two sides extending in the second direction Y. Examples of the overall shape of the in-mold label include, for example, a quadrangle such as a rectangle and a square; and a strip having a curve. The overall shape of the labels 10A to 10C shown in FIGS. 1 to 3 is rectangular.

FIG. 4 is a schematic plan view showing the in-mold label according to the fourth example of the first embodiment. As shown in FIG. 4, the overall shape of the in-mold label 10D according to the fourth example (hereinafter, also referred to as a label 10D) may be a strip having a curve. It is preferable that the strip-like outer edge shape having the above-mentioned curve is constituted by a pair of curves having no intersection and a line segment connecting the above-mentioned pair of curves. More preferably, the pair of curves are parallel to one another. When the entire shape of the label 10D is a strip having a curve, it is preferable that the direction along the curve is the second direction Y. In FIG. 4, the length along the curve at the lower end of the label 10D is L _Y.

The structure of the in-mold label is not particularly limited, and a label generally used as an in-mold label can be used. The said in-mold label has a base material layer, for example. Although the said base material layer is not specifically limited, Paper, a synthetic paper, a resin film, or these laminated bodies are mentioned. The resin film may be a stretched film or a non-stretched film. Moreover, in order to improve printability, you may surface-treat such as corona discharge. As the resin film, one containing nylon 6 (PA 6), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP) or the like can be used. Further, the base material layer may be a vapor-deposited PET film in which aluminum, alumina or the like is vapor-deposited on a PET film. Examples of the synthetic paper include a mixture of resin and fiber, and a resin formed into a fiber and processed to have a texture like paper. As said synthetic paper, PP paper (For example, Yupo Corporation make, Yupo paper) is mentioned, for example. The thickness of the base layer is, for example, 30 μm to 200 μm.

The said in-mold label may be comprised only from the said base material layer, and the laminated body of a base material layer and a printing layer may be sufficient as it. The said printing layer will not be specifically limited if it is a printable thing, The same thing as the said resin film can be used. The in-mold label may also have an adhesive layer. The adhesive layer may be formed on the entire surface of the base layer or may be formed on a part of the base layer. The adhesive layer is not particularly limited as long as it adheres to the resin substrate.

The manufacturing method of the said in-mold label is not specifically limited, For example, after forming a base material layer, the said printing layer, an adhesive layer, etc. are laminated | stacked, Then, the method of cutting out in a desired shape is mentioned. The laminating method is not particularly limited, and for example, a dry lamination method, an extrusion lamination method, an extrusion coating method, and other coating methods can be used. The first incision A and the second incision B may be formed simultaneously with the cutting of the in-mold label, or may be formed after cutting the in-mold label. The method of cutting out the in-mold label and the method of forming the first incision A and the second incision B is not particularly limited, and the in-mold label can be formed by a punching blade, laser cutting, or the like.

Second Embodiment
FIG. 5 is a schematic plan view showing an example of the in-mold label according to the second embodiment. As shown in FIG. 5, in the in-mold label 10E according to the second embodiment (hereinafter, also referred to as a label 10E), the shapes of the first cut A and the second cut B are expanded at the end (lower end) side V-shaped. By forming the first cuts A and the second cuts B into a V shape, when the resin base having a curved surface portion is formed by in-mold molding, in the curved surface portions, the belt-like divided portions 1 The overlap can be reduced or eliminated.

It is preferable that the V-shape is formed in line symmetry. In the second embodiment, when a straight line or curve connecting the ends of the strip dividing unit 1 and the lower end of the label 10E, the L _A is located at a distance from the lower end of the label 10E to the end point of the first cut A , the length L _B of the second cut B is the distance from the lower end of the label 10E to the end of the first notch B. The L _Y is the length of the straight line or curve along a second direction Y of the lower end of the label 10E.

In the label 10E, it is preferable that the end of the strip-shaped part 1 is formed by a straight line or a curve along the second direction Y of the label 10E. For example, in FIG. 5, since the lower end of the label 10E is a curve, the end of the strip-like part 1 is also configured by a curve along the curve of the lower end of the label 10E.

<In-mold molding>
An in-mold molded article according to the present invention comprises a resin base and the in-mold label according to the present invention attached to the outer surface of the resin base, wherein the resin base has a curved surface portion, and the curved surface At least a portion of the portion and the strip-shaped divided portion of the in-mold label overlap. The in-mold molded article of the present invention can be obtained by integrating the obtained in-mold label and the resin substrate after producing the in-mold label of the present invention. Since the in-mold label of the present invention includes the first cut A, the second cut B, and the belt-like divided portion 1 formed by these, the in-mold label can be made to run along the curved portion as well. it can. Furthermore, since the in-mold label of the present invention has the first cuts A and the second cuts B having different lengths, the curved surface of the resin base while suppressing the wrap around of the large and small wrinkles and the resin. You can also decorate the department. In the in-mold molded article of the present invention, since the resin base and the in-mold label are integrated by in-mold molding, even if the in-mold labels overlap slightly, they do not protrude on the outer surface of the molded article . Therefore, the outer surface is smooth and the in-mold molded article of this invention is excellent in aesthetics.

Examples of the in-mold molded articles include household appliances, automobiles, or parts thereof; stationery; food containers such as dishes; buckets, detergent containers, daily articles such as toothbrushes, and the like. Among them, the in-mold molded article of the present invention can be suitably used as a food container, in particular, a food container having a curved surface.

It is preferable that the said resin base material is a container which has a bottom face and a side surface, and the upper side of the said bottom face opened. FIG. 6 is a schematic view showing an example of the in-mold molded article of the present invention, and is a perspective view observed from the bottom. FIG. 7 is a schematic sectional view taken along the line VV of the in-mold molded article shown in FIG. FIG. 7 is a schematic cross-sectional view in which the top and bottom of FIG. 6 are reversed. FIG. 8 is a schematic plan view of the in-mold molded article shown in FIG. As shown in FIG. 6 and FIG. 7, the in-mold molded article 100 of the present invention has the in-mold label 10 integrated on the outer surface of the resin base 20, and at least one of the curved portions of the resin base 20. And the strip-shaped divided portion of the in-mold label overlap. As the in-mold label 10 (hereinafter, also referred to as a label 10), any of the

labels

10A, 10B, 10C, 10D and 10E described above may be used according to the shape of the resin base material.

As shown in FIG. 7, the curved surface portion 20 b is disposed between the bottom surface portion 20 a and the side surface portion 20 c. It is preferable that the curvature radius R (refer FIG. 7) of the curved-surface part 20b is 10 mm or more and 50 mm or less. Moreover, it is preferable that angle (theta) (refer FIG. 7) which the said bottom face part and the said side part make is 90 degrees or more and 150 degrees or less. It is preferable that each of the side surface portion 20c and the bottom surface portion 20a has a straight portion, and the above θ is an angle formed by the straight line along the side surface portion 20c and the straight line along the bottom surface portion 20a.

The cross-sectional shape in a plane parallel to the bottom portion 20a includes a circle, an ellipse, a polygon, a shape in which a plurality of arcs are connected (wedge shape, three-leaf shape, four-leaf shape, etc.), a shape in which arcs and straight lines are connected ( Tears, hearts, etc. are mentioned. 6 to 8 illustrate the case where the cross-sectional shape in a plane parallel to the bottom surface portion 20a is a circle. The ellipse may have an ellipticity of 0.1 or more and less than 1 obtained by dividing the length of the minor axis by the length of the major axis. A more preferable lower limit of the ellipticity is 0.3 or more. In the polygon, each corner may be rounded.

Although the whole shape of a container is not specifically limited, For example, a cylinder, a pyramid, a truncated cone, a truncated pyramid, etc. are mentioned. The truncated cones and truncated pyramids preferably open upward of the container. The cylinder, the pyramid, the truncated cone, the truncated pyramid, etc. have a curved surface portion between the bottom and the side. As a cross-sectional shape in a plane including the perpendicular line of the bottom portion 20a, a substantially trapezoidal shape, a substantially rectangular shape, a substantially square shape or the like can be mentioned.

The inner diameter (diameter of the opening) φ of the upper end of the side surface portion 20c is, for example, 80 mm to 180 mm. The height H of the in-mold molded article 100 is, for example, 35 mm to 125 mm. The height H is, as shown in FIG. 7, the distance between the perpendicular from the bottom surface 20a to the upper end of the side surface 20c and the straight line connecting the side surfaces 20c facing each other across the opening. is there.

The in-mold molded product 100 may be one in which one label 10 is attached to one resin base 20, or a plurality of labels 10 are attached to one resin base 20. It may be For example, when the cross-sectional shape in a plane parallel to the bottom surface portion 20a is a complicated shape such as a shape in which the plurality of arcs are combined, or a shape in which the arcs and straight lines are combined, Preferably, multiple labels 10 are used. When a plurality of labels 10 are used for one resin base material 20, the number of the band-shaped divided portions 1 and the length L _Y of the second direction _Y are each a band-shaped divided portion 1 of one label 10 Refers to the number of and L _Y.

The said resin base material is formed by the resin composition containing resin which can be in-mold-molded. Although the said resin composition is not specifically limited, It is preferable that a thermoplastic resin is included. Examples of the thermoplastic resin include polyolefins such as polypropylene (PP) and polyethylene, polylactic acid (PLA), polystyrene (PS), polyphenylene ether (PPE), polybutylene succinate (PBS), and polybutylene succinate adipate. (PBSA), polycaprolactone (PCL), polyacetal (POM), polyamide (PA) and the like. These may be used alone or in combination of two or more. Among them, polypropylene, polylactic acid, polybutylene succinate and the like are preferable.

The thermoplastic resin may further contain an acid-modified polyolefin or the like. Examples of the acid-modified polyolefin include maleic anhydride-modified polypropylene and maleic anhydride-modified polyethylene.

The resin base material may contain, in addition to the thermoplastic resin, a layered silicate such as talc, mica and montmorillonite; and a filler such as calcium carbonate, glass fiber and cellulose fiber.

<Method of manufacturing in-mold molded article>
In the method for producing an in-mold molded article according to the present invention, a mold having a resin injection port in one of a concave and a convex mold is used, and the belt-like divided portion is on the resin injection port side inside the concave. And a filling step of filling the resin composition from the resin injection port into the cavity formed between the concave and the convex, and the step of arranging the in-mold label of the present invention.

The mold is not particularly limited as long as it is formed of a concave type and a convex type, and one of the concave type and the convex type has a resin injection port. FIG. 9 is a schematic cross-sectional view showing an example of a mold 30 used for producing the in-mold molded article of the present invention. FIG. 9 exemplifies the case where the concave 32 has the resin inlet 35. The mold 30 is composed of a concave 32 and a convex 31, and a cavity 33 is formed between the concave 32 and the convex 31. The concave 32 and the convex 31 have a curved surface portion corresponding to the curved surface portion of the molded product. The resin composition is injected through the runner 34 and filled into the cavity 33 from the resin inlet 35. Although the clearance distance W of the said metal mold | die 30 is not specifically limited, It is preferable that it is 3 mm or less.

The label arrangement step will be described with reference to FIG. FIG. 10 is a partially cutaway perspective view schematically showing a state in which the in-mold label of the present invention is disposed in the mold of FIG. As shown in FIG. 10, in the label disposing step, the strip-like divided portion of the label 10 is disposed on the inner side of the concave 32 so as to be on the resin injection port 35 side. The label 10 is disposed such that the band-shaped divided portion overlaps at least a part of the curved surface portion of the concave 32. It is preferable to arrange the labels 10 so that a part of adjacent strip-shaped divided portions overlap. By arranging in this manner, the label 10 can be arranged along the curved surface portion of the concave 32. It is preferable that the band-shaped divided portion does not overlap with the resin injection port 35. If the label 10 has an adhesive layer, the label 10 is placed inside the recess 32 so that the adhesive layer is on the opposite side of the recess 32.

The method of arranging the label 10 inside the concave 32 is not particularly limited, and a method of fixing the inside of the concave 32 by static electricity may be used. In the case of fixing by static electricity, first, the label 10 is set on the surface of the pseudo core having a convex shape, the label is charged by the charger, and then the pseudo core is inserted into the inside of the concave 32 The label 10 is fixed inside the recess 32. When fixing by static electricity, it is preferable that the label 10 is a material which is easy to generate static electricity.

The filling step is performed, for example, by injection molding. As the above-mentioned injection molding, general injection molding can be used in which the resin composition is filled into the cavity of a mold by an injection molding machine. In addition, supercritical injection molding may be used in which a molten resin containing a supercritical fluid and a resin composition is filled in a cavity of a mold by combining an injection molding machine and a supercritical fluid generator. Examples of the supercritical fluid include supercritical fluids of carbon dioxide, nitrogen, argon, and an inert gas such as helium. Among them, a supercritical fluid of carbon dioxide or nitrogen is preferable. As said resin composition, the thing similar to the resin composition containing the resin which can be molded in-mold illustrated by description of the said resin base material can be used.

After the filling step, before the molten resin filled in the cavity finishes solidifying, a step of moving a part of the mold to expand the volume of the cavity (hereinafter also referred to as “core back”) May be included.

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

<In-mold label>
Example 1
The in-mold label shown in FIG. 4 was produced using the film laminated in order of the 0.1-mm-thick polypropylene (PP) film, the printing layer, and the adhesion layer as a base material layer. In the first embodiment, the linear first incisions A and the linear second incisions B are alternately arranged at equal intervals, and 48 strip-shaped divided portions are provided. The length _{L A} of the first cut A 10 mm, the length _{L B} of the second cut B is 5 mm, the length _{L X} of the first direction X was set to 75 mm.

(Examples 2 to 17 and Comparative Examples 1 to 7)
Using the same PP film as in Example 1, in-mold labels according to Examples 2 to 17 and Comparative Examples 1 to 7 were produced. In Examples 2 to 17 and Comparative Examples 1 to 7, the shape, length, arrangement, or number of band divisions of the first incision A and the second incision B were changed as shown in Table 1 below. Except for the above, this embodiment is the same as the embodiment 1. In Comparative Example 1, no incision was made. In Comparative Examples 2 to 4, the length of the incision was constant. In Table 1, A represents the first cut, B represents a second cut, L _A represents the length of the first cut A, L _B represents the length of the second cut B, L _X represents the length of the first direction X.

<In-mold molding>
First, the resin composition which comprises the resin base material of an in-mold molded article was prepared with the following method. Dry blend of 40% by weight of polypropylene (PP), 25% by weight of polylactic acid (PLA), 10% by weight of maleic anhydride modified polypropylene and 25% by weight of talc, twin screw extruder (manufactured by Japan Steel Works, Ltd., "TEX 30" The mixture was kneaded at a temperature setting of 200 ° C. to obtain a pellet-like resin composition.

Using the mold shown in FIG. 9, as shown in FIG. 10, the in-mold label was arranged inside the concave so that the strip-shaped divided portion of the in-mold label was on the resin injection port side. Each in-mold label was fixed inside the concave by static electricity. Thereafter, using the injection molding machine (manufactured by Nissei Resin Industry Co., Ltd.), the pellet-like resin composition obtained above is melted in a cylinder and injection molded under the following molding conditions, and the above Examples and Comparative Examples An in-mold molded article provided with an in-mold label according to the example was made.
(Molding condition)
Cylinder temperature: 210 ° C
Mold temperature: 45 ° C
Injection speed: 50 mm / sec Screw back pressure: 15 MPa
Cavity thickness: 1.5 mm

The resulting in-mold molded articles were all in the form of a bowl as shown in FIGS. 6-8. The in-mold molded article 100 (hereinafter also referred to as the molded article 100) is configured of the curved surface portion 20b disposed between the bottom surface portion 20a and the side surface portion 20c. Molded product 100 has an opening diameter of 125 mm, a height H of 70 mm, a curvature radius R of 30 mm, and an angle θ of 110 ° between a straight line along side surface portion 20c and a straight line along bottom surface portion 20a. The

<Evaluation>
By using the in-mold labels according to the above-described Examples and Comparative Examples, 1000 in-mold molded articles were produced. With respect to the obtained in-mold molded product, (1) occurrence of large wrinkles, (2) occurrence of small wrinkles, and (3) resin wraparound were evaluated by the following method. The results are shown in Table 2 below.

(1) Generation of Large Wrinkles The surface of the in-mold molded product was visually observed to confirm that large wrinkles were not generated as if the strip-like part of the in-mold label was curled up. Out of the 1000 in-mold molded articles, the case where the above-mentioned large wrinkled molded article is 0 is ◎ (pass), the case where it is one is ○ (pass), the case where it is two or three △ In the case of (passing) and 4 or more, it was regarded as x (not good).

(2) Generation of Small Wrinkles The surface of the in-mold molded product was visually observed, and it was confirmed whether a small wrinkle was generated as if the label was drawn at the deepest position of the in-mold label incision. 1000 (pass) in the case where there are 0 pieces of molded articles where the small wrinkles are generated out of 1000 in-mold molded articles, ○ (pass) in the case of 1 pieces, △ (pass) in the case of 2 pieces or 3 pieces In the case of (passing) and 4 or more, it was regarded as x (not good).

(3) Wrapping of resin The surface of the in-mold molded article was visually observed to confirm whether the resin was superposed on the surface of the in-mold label. Out of 1000 in-mold molded products, ◎ (pass) is when there are no molded products in which resin wrap occurs, ((pass) when it is one, 場合 (pass) when it is one, △ when it is two or three In the case of (passing) and 4 or more, it was regarded as x (not good).

In all the in-mold molded articles provided with the in-mold labels according to Examples 1 to 17, the evaluation results of generation of large wrinkles, generation of small wrinkles, and wrap-around of resin were acceptable. On the other hand, in Comparative Example 1 in which no incision was made, all evaluation results failed. In Comparative Examples 2 to 4 in which the length of the incision was constant, the effect of suppressing the generation of particularly small wrinkles was insufficient. In Comparative Example 7 in which the number of band-shaped divided portions was less than 10, generation of large wrinkles and wraparound of resin were observed.

DESCRIPTION OF SYMBOLS 1 band-shaped

division part

10, 10A, 10B, 10C, 10E In-mold label 20 resin base material 20a bottom part 20b curved part 20c side part 30 mold 31 convex 32 concave 33 cavity 34 runner 34 resin injection port 100 in-mold Molded product 200 Conventional in-mold label 201 notches 202 band-like division parts 203 large wrinkles 204 small wrinkles

Claims

An in-mold label provided with an incision extending along a first direction, and having ten or more band-shaped divisions formed by the incision,
The incisions are disposed along a second direction, and include a first incision and a second incision having a length of 20 to 95% of a length of the first incision. In-mold label.
The in-mold label according to claim 1, wherein a distance between the first incision and the second incision is 2 mm or more and 35 mm or less.
The in-mold label according to claim 1 or 2, wherein a shape of each of the first incision and the second incision is a straight line or a V-shape having an enlarged end side.
The length of the said 1st cut is 3% or more and 80% or less with respect to the length of the said 1st direction of the said in-mold label, It is characterized by the above-mentioned. In-mold label.
A resin substrate, and the in-mold label according to any one of claims 1 to 4 attached to the outer surface of the resin substrate,
The in-mold molded article, wherein the resin base material has a curved surface portion, and at least a part of the curved surface portion overlaps the strip-shaped divided portion of the in-mold label.
The resin base material is a container having a bottom surface and a side surface, and the upper side of the bottom surface is open,
The curved portion is disposed between the bottom surface and the side surface.
The in-mold molded article according to claim 5, wherein a curvature radius of the curved surface portion is 10 mm or more and 50 mm or less.
The mold according to any one of claims 1 to 4, wherein a mold having a resin injection port is used for any one of a concave mold and a convex mold, and the belt-like divided part is on the resin injection port side inside the concave mold. Label placement process for placing in-mold labels,
And a filling step of filling a resin composition from the resin injection port into a cavity formed between the concave and the convex.