TW201933300A - In-mold label, in-mold formed article and method for producing in-mold formed article - Google Patents

Abstract

To provide an in-mold label capable of suppressing generation of large and small wrinkles and wraparound of resin. This in-mold label is provided with cuts extending along a first direction, and is provided with 10 or more strip-like divided portions formed by the cuts, the cuts are arranged along the second direction, An inlaid label comprising a first incision and a second incision having a length of 20 to 95% with respect to the length of the first incision.

Description

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

The present invention relates to an in-mold label, an in-mold molded product having the in-mold label, and a method for manufacturing an in-mold molded product using the in-mold label.

One of the methods of decorating the surface of a molded article is to use in-mold molding. The above-mentioned in-mold molding is a method of integrating a label and a surface of a molded product by filling a resin composition into a mold after placing a label that has been printed in advance in a mold.

The shape of a label for in-mold molding (hereinafter also referred to as an in-mold label) has been variously reviewed. For example, Patent Document 1 discloses an in-mold label having a base layer for printing. A label is attached to the horizontally long strip or fan shape of the adhesive layer, and a part of the width and the length of the base is extended as a base. At least a part of the upper and lower parts of the base is longitudinally arranged in the cut line. A plurality of adjacent band-shaped pieces having a base portion as a connecting portion and a label upper end or a lower end side as a free end are formed in part.
[Prior technical literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2006-123446

[Invention to solve the problem]

When a base material having a curved portion is integrated with an in-mold label, it is difficult to cause the in-mold label to run along the curved portion, and it is easy to cause formation defects such as wrinkles in the curved portion. Therefore, in the conventional mainstream of in-mold molded products, in-mold molding is performed by placing in-mold labels in the mold so as not to overlap the curved surface portion of the substrate.

In recent years, from the viewpoint of improving design, there is a demand for decoration from a bottom surface of a base material to an upper end of a side surface. However, when the in-mold forming is performed in such a manner that the curved surface portion of the base material and one of the in-mold labels are partially overlapped, there are the following situations, where the end of the in-mold label is rolled up and in-mold A large wrinkle is generated when the label is attached, or the resin composition is wound around from the upwardly rolled portion and penetrates into the outside of the in-mold label. According to the review by the inventors of the present case, the above problems are caused by the following situations: (1) When the in-mold label is applied to a substrate having a curved surface, the above-mentioned in-mold label is not sufficiently connected with the cavity of the mold. The curved surface portion is closely adhered, and the resin composition leaks from the gap between the in-mold label and the mold. (2) The molten resin composition flowing at a high speed from the resin injection port collides with the in-mold label, and the end of the in-mold label is bent. FIG. 11 is an enlarged plan view illustrating a band-shaped divided portion caused by a wrinkle caused by an upward turning of an end portion. In FIG. 11, a blank arrow indicates the inflow direction of the resin composition. As shown in FIG. 11, when a label 200 is attached to a conventional mold, the resin composition flowing in from the end of the band-shaped divided portion 202 formed with the cutout 201 causes the band-shaped divided portion 202 to be rolled up to generate large wrinkles 203.

In the above-mentioned Patent Document 1, it is reviewed that a plurality of adjacent strip-shaped pieces are formed by in-mold labeling, and in-mold labeling is applied to a curved surface portion of a container body surface to provide a wrinkle-free appearance In-mold labeled container. However, the inventors of the present application observed the wrinkles generated in the in-mold label-molded article in more detail, and found that in addition to the large wrinkles generated by the end of the in-mold label being rolled up, they were still formed in A small wrinkle is generated at the innermost position of the incision of the label attached to the mold. The small wrinkles generated at the innermost position of the above-mentioned incision are disclosed in the above-mentioned Patent Document 1. It is impossible to solve the problem by merely adding the incision into the mold to attach a label, and there is room for further review. In addition, in the present specification, when the end of the band-shaped divided portion is used as a starting point, the innermost position of the cut means the end point of the cut.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide an in-mold attached label capable of suppressing the occurrence of large and small wrinkles and the invasion of resin, a method for manufacturing an in-mold molded product using the in-molded attached label, and In-mold molded products with good appearance due to the generation of large and small wrinkles and the intrusion of resin.
[Means for solving problems]

The inventor of this case examined the influence of the number of cuts added to one end of the in-mold label in order to prevent the end of the in-mold label from being rolled up during forming. As a result, it can be seen that by increasing the number of cuts and providing more than 10 strip-shaped divisions, it is possible to suppress the occurrence of wrinkles caused by the above-mentioned end of the label attached to the mold and the invasion of resin.

On the other hand, the inventors found that when the number of incisions is increased, small wrinkles are easily generated at the innermost position of the incisions, and the causes of the small wrinkles are reviewed. FIG. 12 is a schematic enlarged plan view illustrating a band-shaped divided portion where a small wrinkle is generated at the innermost position of the cut. When in-mold molding is performed, as shown in FIG. 12, the in-mold label 200 is stretched in two directions along the curved surface of the substrate as shown by blank arrows. At this time, it can be seen that since the stress is concentrated at the innermost position of the cutout 201, a small wrinkle 204 is generated. Furthermore, it can be seen that the narrower the interval between adjacent cutout portions, the more easily the small wrinkles are generated.

The inventor of this case continued to review and found that by using more than 10 strip-shaped divisions on one end of the label attached to the mold, the above-mentioned large wrinkles and the invasion of the resin can be suppressed, and by adding different lengths The incision can increase the distance between adjacent incisions and suppress the occurrence of the above-mentioned small wrinkles, and completed the present invention.

One aspect of the present invention is an in-mold label, which is provided with a cutout extending along the first direction, and has more than 10 band-shaped divisions formed by the cutout, and the cutout is arranged along the second direction. It has a first incision and a second incision, and the length of the second incision is 20 to 95% of the length of the first incision.

The interval between the first cut and the second cut is preferably 2 mm or more and 35 mm or less.

The shape of the first cutout and the second cutout is preferably linear or V-shaped with an enlarged end portion side.

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

Another aspect of the present invention is an in-mold molded product comprising a resin substrate and the in-mold label of the present invention attached to an outer surface of the resin substrate; the resin substrate has a curved portion, and At least a part of the curved surface portion overlaps the strip-shaped division portion with the in-mold label.

The resin substrate is preferably a container having a bottom surface and a side surface and an upper side of the bottom surface is opened, the curved surface portion is disposed between the bottom surface and the side surface, and a curvature radius of the curved surface portion is 10 mm or more and 50 mm or less.

Still another aspect of the present invention is a method for manufacturing an in-mold product, which includes a label arrangement process and a filling process. The label arrangement process uses a mold having a resin injection port in either of a concave mold and a convex mold. The in-mold label of the present invention is arranged on the inside of the die so that the strip-shaped divided portion is on the resin injection port side; the filling process fills the resin composition from the resin injection port to the resin mold formed on the concave mold and the convex mold Between the mold cavities.
[Effect of the invention]

According to the in-mold label according to the present invention and the method for manufacturing an in-mold molded product according to the present invention, it is possible to provide an in-mold molded product which suppresses the occurrence of large and small wrinkles and the intrusion of the resin. The in-mold molded product of the present invention is a molded product with no appearance of wrinkles and invasion of the resin, and good appearance.

[Forms for Implementing Invention]

＜ In-mold labeling ＞
[Embodiment 1]
FIG. 1 is a schematic plan view showing an in-mold label in the first example of Embodiment 1. FIG. As shown in FIG. 1, the first example of an in-mold label 10A (hereinafter also referred to as a label 10A) is provided with a cutout extending along the first direction X, and has more than 10 band-shaped divisions formed by the cutout. Department 1. The strip-shaped divided portion 1 is formed between both ends of the label 10A and the cutout and between adjacent cutouts. Since the number of the band-shaped divided portions 1 is 10 or more, when the label 10A is placed in the mold, it can be arranged along the curved surface of the mold, so that the end of the band-shaped divided portion 1 can be suppressed from being rolled up. Large wrinkles. In addition, since the rigidity of the end portions of each of the strip-shaped divided portions 1 is increased by the incisions, the end portions of the strip-shaped divided portions 1 are not rolled up even if the resin composition is filled from the resin injection port. On the other hand, it is possible to prevent the resin composition from invading the back side of the label. If the number of the strip-shaped divided portions 1 is less than 10, the rigidity of the end portion of the strip-shaped divided portions 1 is reduced, and when the in-mold molding is performed, the above-mentioned large wrinkles are generated in the molded product and the resin is wound around and invaded. .

The cuts are arranged along the second direction Y, and have a first cut A and a second cut B. The length of the second cut B is 20 to 95% of the length of the first cut A. In FIG. 1, L _X shows the length of the first direction X, L _A shows the length of the first cut A, and L _B shows the length of the second cut B. By setting incisions with different lengths, the innermost position of the incision can be staggered, while maintaining the rigidity in the Y direction of the innermost position of the incision. This makes it possible to increase the number of the band-shaped divided portions 1, suppress the generation of the above-mentioned large wrinkles and the invasion of the resin, and also suppress the generation of small wrinkles generated at the innermost position of the incision.

The length L _B of the second cut B is 20 to 95% with respect to the length L _{A of the} first cut A (hereinafter, also referred to as L _B / L _A ). When the above L _B / L _{A is} less than 20%, the rigidity of the end portion of the band-shaped divided portion 1 is insufficient, and during the in-mold molding, the above-mentioned large wrinkles are generated in the molded product and the resin is wound around. Trespass. This is because when the L _{B is} too short compared to the L _A , the effect of forming the second notch B cannot be sufficiently obtained. On the other hand, when the above-mentioned L _B / L _A exceeds 95%, the rigidity in the second direction Y cannot be maintained at the innermost positions of the first and second cuts A and B, so the small wrinkles are particularly likely to occur. The preferred lower limit of the above L _B / L _A is 25%, the preferred upper limit is 85%, a more preferred upper limit is 70%, a more preferred upper limit is 50%, and a particularly preferred 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 and the length L _{Y of} the second direction Y of the label 10A may be the same or different. When the L _X and the L _{Y are} different, any one of the L _X and the L _Y may be long. The L _X and the L _{Y are} not particularly limited, and may be appropriately changed depending on the shape of the resin substrate to which the label 10 is attached. The L _X is, for example, 35 mm to 200 mm. The L _Y is, for example, 150 mm to 600 mm. In addition, the first direction X is a direction along one side of the outer edge of the label 10A, and the second direction Y is a direction that intersects the first direction X and is along a side different from the one side of the outer edge of the label 10A. direction. In the L _X- based instruction label 10A, when the end portion on the side of the strip-shaped divided portion 1 is the lower end and the end portion on the opposite side is the upper end, the lower end of the label 10A (band-shaped divided portion) along the first direction X 1) to the upper end. The above L _Y refers to the length of the end portion (the lower end of the label 10) of the label 10A on the side where the strip-shaped divided portion 1 is formed.

The shape of the first notch A and the second notch B is preferably a straight line or a V-shape with an enlarged end (lower end) side. The shape of the first cutout A and the shape of the second cutout B may be the same or different. In the first embodiment, a case where the shapes of the first cutout A and the second cutout B are linear will be described.

The length L _A of the first cut A is preferably 3% or more and 80% or less with respect to the length L _{X in} the first direction X of the label attached to the mold. When the length L _A of the first cut A is less than 3% with respect to the length L _{X of the} first direction X (hereinafter also referred to as L _A / L _X ), because the cut is shallow, the lower end of the label 10A does not follow the mold. There may be large wrinkles on the curved surface and the invasion of resin. On the other hand, when the above-mentioned L _A / L _X exceeds 80%, since the cut is too deep, the label 10 may be broken when the label 10 is filled in a mold cavity. The preferred lower limit of the above L _A / L _X is 5%, the preferred upper limit is 60%, the more preferred lower limit is 10%, and the more preferred upper limit is 55%.

The length L _B of the second cutout B is preferably 0.6% or more and 70% or less with respect to the length L _X of the first direction X of the in-mold label. When the length L _B of the second cutout B is less than 0.6% with respect to the length L _{X of the} first direction X (hereinafter also referred to as L _B / L _X ), the end (lower end) of the label 10A is not smooth because the cutout is shallow. The surface of the mold may cause large wrinkles and resin intrusion. On the other hand, when the above-mentioned L _B / L _X exceeds 70%, since the cut is too deep, there is a possibility that the label 10 may break when the label 10 is filled in a mold cavity. The preferred lower limit of the above L _B / L _X is 3%, the preferred upper limit is 50%, the more preferred lower limit is 5%, the more preferred upper limit is 40%, the more preferred upper limit is 35%, and the particularly preferred upper limit is 30%.

The interval between the first incision A and the second incision B is preferably 2 mm or more and 35 mm or less. When the above-mentioned interval is less than 2 mm, the innermost positions of adjacent incisions are close, the rigidity in the Y direction of the innermost positions of the incisions is reduced, and there is a possibility that small wrinkles are generated at the innermost positions of the incisions. On the other hand, when the above-mentioned interval exceeds 35 mm, the rigidity of the end portion of the strip-shaped divided portion 1 is reduced, and large wrinkles caused by the end of the strip-shaped divided portion 1 are rolled up and the resin is wound. Invasion. The interval between the first cutout A and the second cutout B corresponds to the width of the band-shaped divided portion formed by the first cutout A and the second cutout B. The width of the strip-shaped divided portion formed by all of the first cutout A and the second cutout B of the label 10 is preferably 2 mm or more and 35 mm or less.

The arrangement pattern of the first incision A and the second incision B is shown in FIG. 1, and the arrangement pattern of the first incision A and the second incision B along the second direction Y can be taken as an example. With this configuration, even if the number of the band-shaped divided portions 1 is increased, the rigidity in the Y direction of the innermost position of the incision can be maintained by staggering the innermost position of the adjacent incision, and the generation of small wrinkles can be effectively suppressed. The first incision A and the second incision B should be alternately arranged at equal intervals.

Another arrangement mode may include an arrangement mode including a repeating pattern in which at least one of the first slit A and the second slit B is continuously arranged along the second direction Y as shown in FIGS. 2 and 3. The above-mentioned repeating pattern may include at least once along the second direction Y of the in-mold labeling, or not all the strip-shaped divisions may be constituted by the above-mentioned repeating pattern. The number of consecutive times of the first incision A and the number of consecutive times of the second incision B should preferably be 2 or more and 5 or less. The interval between adjacent first incisions A when the first incision A is continuously arranged, and the interval between adjacent second incisions B when the second incision B is continuously arranged may be the same as the interval between the first incision A and the second incision B. The same or different.

In any of the above arrangements, the interval between adjacent incisions should be 2mm or more and 35mm or less. The interval between the adjacent incisions is preferably an equal interval. In addition, the width of all the strip-shaped divided portions 1 included in the label 10 is preferably 2 mm or more and 35 mm or less.

FIG. 2 is a schematic plan view showing a second example of an in-mold label in Embodiment 1. FIG. As shown in FIG. 2, the second example of an in-mold label 10B (hereinafter also referred to as a label 10B) includes a repeating pattern P1 in which a first cut A and a second cut B are arranged twice in a row along the second direction Y. . FIG. 3 is a schematic plan view showing a third example of an in-mold label in Embodiment 1. FIG. As shown in FIG. 3, the third example of an in-mold label 10C (hereinafter, also referred to as a label 10C) includes a repeating pattern P2 in which a first incision A and a second consecutive incision B are arranged along the second direction Y. . Even when the repeating pattern P1 shown in FIG. 2 and the repeating pattern P2 shown in FIG. 3 are included, the first and second cuts A and B are alternately arranged as shown in FIG. The generation and invasion of resin. From the viewpoint of more effectively suppressing small wrinkles, it is more preferable to arrange the first incision A and the second incision B alternately.

The overall shape of the in-mold label of the present invention can be appropriately changed according to the shape of the molded product, as long as it has two sides extending in the first direction X and two sides extending in the second direction Y. The strip-shaped divided portion 1 is provided on one of the two sides extending in the second direction Y. The overall shape of the above-mentioned in-mold label can be, for example, a rectangular shape such as a rectangle, a square, or a curved belt. 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 an in-mold label in the fourth example of Embodiment 1. FIG. As shown in FIG. 4, the overall shape of the in-mold attached label 10D (hereinafter also referred to as the label 10D) of the fourth example may be a belt shape having a curve. The shape of the strip-shaped outer edge having the above-mentioned curve is preferably composed of a pair of curves without intersections and a line segment connecting the above-mentioned one pair of curves to each other. It is more preferable that the one pair of curves is parallel to each other. When the overall shape of the label 10D is a curved shape, the direction along the curve is preferably the second direction Y. In FIG. 4, the length of the curve along the lower end of the label 10D is L _Y.

The structure of the above-mentioned in-mold label is not particularly limited, and a generally used label can be used. The said in-mold label has a base material layer, for example. The above-mentioned substrate layer is not particularly limited, and examples thereof include paper, synthetic paper, resin film, and the like. The resin film may be a stretched film or an unstretched film. In addition, in order to improve printability, a surface treatment such as corona discharge may be performed. As the resin film, a film containing nylon 6 (PA6), polyethylene terephthalate (PET), polyethylene (PE), or polypropylene (PP) can be used. Moreover, the said base material layer may be a PET film which vapor-deposited aluminum, alumina, etc. on PET film. Examples of the synthetic paper include a synthetic paper in which a resin and a fiber are mixed, a synthetic paper in which a resin is formed into a fibrous shape, and processed into a paper-like texture. Examples of the synthetic paper include PP paper (for example, Yupo Paper, manufactured by Yupo Corporation). The thickness of the substrate layer is, for example, 30 μm to 200 μm.

The in-mold label may be composed of only the above-mentioned base material layer, or may be a laminated body of the base material layer and the printing layer. The print layer is not particularly limited as long as it is printable, and the same as the resin film can be used. The in-mold label may have an adhesive layer. The said adhesive layer may be formed in the whole surface of the said base material layer, and may be formed in a part. The said adhesive layer is not specifically limited if it adheres to a resin base material.

The manufacturing method of the above-mentioned in-mold labeling is not particularly limited, and for example, a method of laminating the above-mentioned printed layer, adhesive layer, etc. after forming a base material layer, and then cutting it into a desired shape as an example. The above-mentioned lamination 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 cut A and the second cut B can be formed at the same time as the cutting of the label attached to the mold, or can be formed after the label is attached to the cutting mold. The method of cutting the label attached to the mold and the method of forming the first cut A and the second cut B are not particularly limited, and can be formed by a punching knife, laser cutting, or the like.

[Embodiment 2]
FIG. 5 is a schematic plan view showing an example of in-mold labeling in the second embodiment. As shown in FIG. 5, a label 10E (hereinafter, also referred to as a label 10E) is attached to a mold in the second embodiment, and the shapes of the first cutout A and the second cutout B are V-shaped with enlarged end (lower end) side. When the shapes of the first cutout A and the second cutout B are V-shaped, when the resin base material having a curved portion is molded in-mold, the overlapping of the strip-shaped divided portions 1 on the curved portion can be reduced or eliminated. .

The above-mentioned V-shape should preferably be linearly symmetric. In the second embodiment, when a straight line or a curve connecting the ends of the strip-shaped divided portion 1 is taken as the lower end of the label 10E, the above L _{A is} the 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 point of the first cut B. The L _Y is the length of a straight line or a curve along the second direction Y at the lower end of the label 10E.

On the label 10E, the end of the strip-shaped divided portion 1 is preferably 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 portion of the strip-shaped divided portion 1 is also formed by a curve along the curve of the lower end of the label 10E.

<In-mold products>
The in-mold molded product of the present invention includes a resin substrate and an in-mold label of the present invention attached to an outer surface of the resin substrate. The resin substrate has a curved surface portion, and at least a part of the curved surface portion is in contact with the above. The aforementioned strip-shaped divided portions to which the label is attached are overlapped. The in-mold molded product of the present invention is obtained by integrating the obtained in-mold label with a resin substrate after making the in-mold label of the present invention. Since the in-mold label of the present invention includes the above-mentioned first cutout A, second cutout B, and the strip-shaped divided portion 1 formed therefrom, it is also possible to make the in-mold stick label follow the curved surface portion. Furthermore, since the in-mold label of the present invention has the first cutout A and the second cutout B with different lengths, the size of the wrinkles and the invasion of the resin can be suppressed, and it can also be used on the curved surface of the resin substrate. Decorate and so on. Since the in-mold molded product of the present invention integrates the resin substrate and the in-mold label by in-mold molding, even if the in-mold label slightly overlaps each other, it does not protrude to the outer surface of the molded product. Therefore, the outer surface of the in-mold molded product of the present invention is smooth and excellent in appearance.

Examples of the in-mold molded product include household appliances, automobiles, parts of automobiles, food containers such as stationery and tableware, buckets, detergent containers, and daily necessities such as toothbrushes. Among them, the in-mold molded article of the present invention can be suitably used as a container for food, particularly a container for food having a curved surface.

The resin substrate is preferably a container having a bottom surface and a side surface, and an upper side of the bottom surface is opened. FIG. 6 is a schematic view showing an example of an in-mold molded product according to the present invention, and is a perspective view viewed from a bottom surface. FIG. 7 is a schematic cross-sectional view of VV ′ of the in-mold molded product shown in FIG. 6. FIG. 7 is a schematic cross-sectional view of FIG. 6 being turned upside down. FIG. 8 is a schematic plan view of the in-mold molded product shown in FIG. 6. As shown in FIGS. 6 and 7, the in-mold molded product 100 of the present invention is integrated with the outer surface of the resin base material 20, and at least a part of the curved surface portion of the resin base material 20 is attached to the mold. The strip-shaped divisions of the labels overlap. The in-mold label 10 (hereinafter also referred to as the label 10) may also be used in accordance with the shape of the resin substrate, and any of the above-mentioned labels 10A, 10B, 10C, 10D, and 10E may be used.

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. The curvature radius R (refer to FIG. 7) of the curved surface portion 20 b is preferably 10 mm or more and 50 mm or less. In addition, the angle θ (refer to FIG. 7) formed by the bottom surface portion and the side surface portion is preferably 9015020c and the bottom surface portion 20a has a straight portion, respectively. Angle.

The cross-sectional shape of the plane parallel to the bottom surface portion 20a can be circular, oval, polygonal, plural arcs (gourd, clover, four-leaf, etc.), arcs and straight lines (tears) Drop shape, heart shape, etc.) as examples. 6 to 8 illustrate a case where the cross-sectional shape of a surface parallel to the bottom surface portion 20a is circular. The ellipse may have an ellipticity of the length of the short axis divided by the length of the long axis of 0.1 or more and less than 1. The preferable lower limit of the ellipticity is 0.3 or more. The above polygons may be rounded at each corner.

The overall shape of the container is not particularly limited, and examples thereof include a cylinder, a pyramid, a truncated cone, and a truncated cone. The above-mentioned conical frustum and pyramid frustum should preferably be opened above the container. The cylinder, the pyramid, the truncated cone and the truncated cone are equal to a curved surface portion between the bottom surface and the side surface. The cross-sectional shape of a surface including a vertical line of the bottom surface portion 20a may be approximately trapezoidal, approximately rectangular, approximately square, or the like.

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 product 100 is, for example, 35 mm to 125 mm. The height H is the length of a vertical line drawn from the bottom surface portion 20a to a straight line formed by connecting the upper ends of the side portions 20c facing each other across the opening as shown in FIG.

The in-mold molded product 100 may be one in which one label 10 is attached to one resin base material 20 or one in which a plurality of labels 10 are attached to one resin base material 20. For example, when the cross-sectional shape of a plane parallel to the bottom surface portion 20a is a complex shape such as a combination of the plural arcs and a combination of the arc and a straight line, it is preferable to use a plurality of sheets for one resin substrate 20. Label 10. In addition, when plural labels 10 are used for one resin substrate 20, the number of the strip-shaped divisions 1 and the length L _{Y in the} second direction Y refer to the number of the strip-shaped divisions 1 and L _{Y of} one label 10, respectively. .

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

The thermoplastic resin may further contain an acid-denatured polyene or the like. Examples of the acid-denatured polyene include anhydrous maleic acid-modified polypropylene, anhydrous maleic acid-modified polyethylene, and the like.

The resin substrate may contain, in addition to the thermoplastic resin, layered silicates such as talc, mica, and montmorillonite, fillers such as calcium carbonate, glass fibers, and cellulose fibers.

＜ Manufacturing method of in-mold products ＞
The manufacturing method of the in-mold molded product of the present invention includes a label disposition process and a filling process. The label disposition process uses a mold having a resin injection port in either of a concave mold and a convex mold. The in-mold label is arranged such that the strip-shaped divided portion is on the resin injection port side; the filling process fills the resin composition from the resin injection port to a cavity formed between the concave mold and the convex mold.

The mold is composed of a concave mold and a convex mold, and any one of the concave mold and the convex mold is not particularly limited as long as it has a resin injection port. FIG. 9 is a schematic cross-sectional view showing an example of a mold 30 used for manufacturing an in-mold molded product of the present invention. FIG. 9 illustrates a case where the die 32 has a resin injection port 35. The mold 30 is composed of a female mold 32 and a male mold 31, and a cavity 33 is formed between the female mold 32 and the male mold 31. The female die 32 and the male die 31 have a curved surface portion corresponding to a curved surface portion of a molded product. The resin composition is injected through the runner 34, and the cavity 33 is filled from the resin injection port 35. The gap distance W of the mold 30 is not particularly limited, and is preferably 3 mm or less.

The above-mentioned label placement process will be described using FIG. 10. FIG. 10 is a partially cutaway perspective view schematically showing a state in which a label is attached to the mold of the present invention in the mold configuration of FIG. 9. As shown in FIG. 10, the above-mentioned label placement process is arranged on the inner side of the die 32 such that the strip-shaped divided portion of the label 10 is on the resin injection port 35 side. The label 10 is arranged such that the band-shaped divided portion overlaps at least a part of the curved surface portion of the die 32. The die tag 10 is preferably arranged such that a part of the adjacent strip-shaped divided portions overlap. With this arrangement, the label 10 can be arranged along the curved portion of the die 32. It is preferable that the band-shaped divided portion does not overlap the resin injection port 35. When the label 10 has an adhesive layer, the label 10 is arranged inside the die 32 so that the above adhesive layer is on the opposite side of the die 32.

The method of arranging the label 10 inside the die 32 is not particularly limited, and a method of electrostatically fixing the tag 10 inside the die 32 may be used. When fixing by static electricity, first, the label 10 is placed on the surface of a dummy core having a convex shape, and the label is charged by a motor. Then, the dummy core is inserted into the inside of the concave mold 32, and the static electricity is The label 10 is fixed inside the die 32. When statically fixed, the label 10 should be made of a material that is prone to static electricity.

The filling process is performed by, for example, injection molding. The injection molding can be performed by general injection molding in which a resin composition is filled in a cavity of a mold by an injection molding machine. In addition, supercritical injection molding in which a molten resin containing a supercritical fluid and a resin composition is filled into a cavity of a mold may be used using a combination injection molding machine and a supercritical fluid generating device. Examples of the supercritical fluid include supercritical fluids of inert gases such as carbon dioxide, nitrogen, argon, and helium. Among them, carbon dioxide or nitrogen supercritical fluid is preferred. As the resin composition, the same resin composition as that exemplified in the description of the resin substrate and containing a resin that can be molded in-mold can be used.

After the filling process, it may further include a process of moving a part of the mold to expand the volume of the mold cavity before the solidification of the molten resin filled in the mold cavity is completed (hereinafter, also referred to as "mold core" go back").
[Example]

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

＜ In-mold labeling ＞
(Example 1)
A polypropylene (PP) film having a thickness of 0.1 mm as a base material layer, a printed layer, and an adhesive layer were laminated in this order to make an in-mold label as shown in FIG. 4. In Example 1, the linear first cutout A and the linear second cutout B are alternately arranged at equal intervals, and 48 band-shaped divided portions are provided. The length L _A of the first cut _A is 10 mm, the length L _B of the second cut _B is 5 mm, and the length L _X of the first direction _X is 75 mm.

(Examples 2 to 17 and Comparative Examples 1 to 7)
The same PP film as in Example 1 was used to prepare in-mold attached labels for Examples 2 to 17 and Comparative Examples 1 to 7. In Examples 2 to 17 and Comparative Examples 1 to 7, the shape, length, arrangement, or number of band-shaped divisions of the first cutout A and the second cutout B were changed to those shown in Table 1 below. Is the same as in Example 1. In addition, in Comparative Example 1, no cut was provided. In Comparative Examples 2 to 4, the length of the incision was made constant. In Table 1, A indicates a first cut, B indicates a second cut, L _A indicates a length of the first cut A, L _B indicates a length of the second cut B, and L _X indicates a length of the first direction X.

[Table 1]

<In-mold products>
First, a resin composition constituting a resin base material of an in-mold molded product was prepared by the following method. 40% by weight of dry polypropylene (PP), 25% by weight of polylactic acid (PLA), 10% by weight of anhydrous maleic acid modified polypropylene and 25% of talc, using a twin-shaft extruder (Nihon Seisakusho Co., Ltd. ("TEX30"), kneaded at a temperature of 200 ° C, and a pellet-like resin composition was obtained.

A mold shown in FIG. 9 was used, and as shown in FIG. 10, a tape-shaped divided portion attached with a label in each mold was arranged on the resin injection port side as shown in FIG. 10. Each mold is attached with a label to be electrostatically fixed to the inside of the mold. Then, using an injection molding machine (manufactured by Nissei Resin Industry Co., Ltd.), the pellet-like resin composition obtained above was melted in a cylinder, and injection molding was performed under the following molding conditions to produce the above-mentioned Examples and Comparative Examples. In-mold molded product with label in-mold.
(Forming conditions)
Cylinder temperature: 210 ℃
Mold temperature: 45 ° C
Injection speed: 50mm / s Screw back pressure: 15MPa
Cavity thickness: 1.5mm

The obtained in-mold molded products are all bowl-shaped as shown in FIGS. 6 to 8. The in-mold molded product 100 (hereinafter also referred to as a molded product 100) is composed of a bottom surface portion 20a, a side surface portion 20c, and a curved portion 20b disposed between the bottom surface portion 20a and the side surface portion 20c. The diameter ϕ of the opening of the molded product 100 is 125 mm, the height H is 70 mm, the radius of curvature R is 30 mm, and the angle θ formed by a straight line along the side surface portion 20c and a straight line along the bottom surface portion 20a is 110.

＜ Evaluation ＞
Using the in-mold labeling of the above examples and comparative examples, 1,000 in-mold molded products were produced. About the obtained in-mold molded product, (1) the generation of large wrinkles, (2) the generation of small wrinkles, and (3) the wrapping intrusion of the resin were evaluated by the following methods. The results are shown in Table 2 below.

(1) Generation of large wrinkles Visually observe the surface of the in-mold molded product, and confirm whether or not large wrinkles such as the roll-up of the strip-shaped divided portion attached with a label in the mold are generated. Among the 1000 in-mold molded products, the case where the above-mentioned large wrinkles are formed is 0 (pass), the case where 1 is ○ (pass), and the case where 2 or 3 are △ ( (Pass), when there are 4 or more, it is X (Fail).

(2) Generation of small wrinkles The surface of the in-mold molded product was visually observed, and it was confirmed whether or not small wrinkles such as label pulling were generated at the innermost position of the cutout to which the label was attached in the mold. Among the 1000 in-mold products, the case where the above-mentioned small wrinkles are formed is 0 (pass), a case of 1 is ○ (pass), and a case of 2 or 3 is △ ( (Pass), when there are 4 or more, it is X (Fail).

(3) Rewinding of the resin to invade the surface of the molded product in the mold to visually check whether the surface of the resin has a label on the mold. Among the 1000 in-mold products, the case where there is no resin-wound intrusion is 0 (pass), the case of 1 is ○ (pass), and the case of 2 or 3 is △ ( (Pass), when there are 4 or more, it is X (Fail).

[Table 2]

The evaluation results of the in-mold molded product having the in-mold labeling of Examples 1 to 17 were that the occurrence of large wrinkles, the generation of small wrinkles, and the invasion of the resin were satisfactory. On the other hand, Comparative Example 1 which did not include an incision failed all evaluation results. In Comparative Examples 2 to 4 in which the length of the incision was constant, the effect of suppressing the generation of small wrinkles in particular was insufficient. In Comparative Example 7 in which the number of band-shaped divided portions was less than 10, generation of large wrinkles and invasion of resin were observed.

1‧‧‧Striped section

10‧‧‧ In-mold labeling

10A‧‧‧In-mold sticker

10B‧‧‧ In-mold labeling

10C‧‧‧In-mold labeling

10D‧‧‧ In-mold label

10E‧‧‧In-mold labeling

20‧‧‧ resin substrate

20a‧‧‧bottom face

20b‧‧‧Surface

20c‧‧‧Side

30‧‧‧Mould

31‧‧‧ punch

32‧‧‧ female die

33‧‧‧Mould cavity

34‧‧‧ runner

35‧‧‧resin injection port

100‧‧‧ In-mold products

200‧‧‧ Past in-mold labeling

201‧‧‧ incision

202‧‧‧Striped division

203‧‧‧Large Wrinkles

204‧‧‧small wrinkles

A‧‧‧1st incision

B‧‧‧ 2nd incision

H‧‧‧ height

L _X ‧‧‧ Length of X in the first direction

L _Y ‧‧‧length of _{Y in} the second direction

L _A ‧‧‧ Length of 1st incision A

L _B ‧‧‧ Length of 2nd incision B

P1‧‧‧ Repeat mode

P2‧‧‧Repeat mode

R‧‧‧ radius of curvature

W‧‧‧ Gap distance

X‧‧‧ 1st direction

Y‧‧‧ 2nd direction

θ‧‧‧ angle

ϕ‧‧‧diameter of opening

FIG. 1 is a schematic plan view showing an in-mold label in the first example of Embodiment 1. FIG.

FIG. 2 is a schematic plan view showing a second example of an in-mold label in Embodiment 1. FIG.

FIG. 3 is a schematic plan view showing a third example of an in-mold label in Embodiment 1. FIG.

FIG. 4 is a schematic plan view showing an in-mold label in the fourth example of Embodiment 1. FIG.

FIG. 5 is a schematic plan view showing an example of in-mold labeling in the second embodiment.

FIG. 6 is a schematic view showing an example of an in-mold molded product of the present invention, and is a perspective view viewed from a bottom surface.

FIG. 7 is a schematic cross-sectional view of VV ′ of the in-mold molded product shown in FIG. 6.

FIG. 8 is a schematic plan view of an in-mold product shown in FIG. 6.

FIG. 9 is a schematic cross-sectional view showing an example of a mold used for manufacturing an in-mold molded product of the present invention.

FIG. 10 is a partially cutaway perspective view schematically showing a state in which a label is attached to the mold of the present invention in the mold configuration of FIG. 9.

FIG. 11 is a schematic enlarged plan view illustrating a band-shaped divided portion caused by a large wrinkle caused by an upward turning of an end portion.

FIG. 12 is a schematic enlarged plan view illustrating a band-shaped divided portion where a small wrinkle is generated at the innermost position of the cut.

Claims (7)

An in-mold label is provided with a cutout extending along a first direction, and has more than 10 band-shaped divisions formed by the cutout. The notch is arranged along the second direction and has a first notch and a second notch. The length of the second notch is 20 to 95% of the length of the first notch. For example, if a label is attached to the mold within the scope of patent application, The interval between the first cut and the second cut is 2 mm or more and 35 mm or less. For example, if the first or second item of the scope of patent application is attached with a mold, The shape of the first cutout and the second cutout are linear or V-shaped with enlarged end portions. If an in-mold label is attached to any of the items 1 to 3 of the scope of patent application, where: The length of the first cut is 3% to 80% of the length of the in-mold label in the first direction. An in-mold product comprising: Resin substrate; and If an in-mold label is applied to any of the items 1 to 4 of the patent application scope, it is attached to the outer surface of the resin substrate; The resin base material has a curved surface portion, and at least a portion of the curved surface portion overlaps the strip-shaped division portion attached with a label in the mold. For example, the in-mold molded product of the scope of application for patent No. 5 wherein: The resin substrate is a container having a bottom surface and a side surface, and an upper side of the bottom surface is opened, The curved surface portion is disposed between the bottom surface and the side surface, The curvature radius of this curved surface part is 10 mm or more and 50 mm or less. A method for manufacturing an in-mold product includes: The label configuration process uses a mold having a resin injection port in either of a concave die and a convex die, and a label will be attached to the inside of the concave die as in any of the items 1 to 4 of the patent application scope Configured such that the band-shaped divided portion is on the resin injection port side; and In a filling process, a resin composition is filled from the resin injection port to a cavity formed between the concave mold and the convex mold.