JP2005132067A - Laminated sheet, in-mold molding, and food container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated sheet excellent in nonskid performance of the external surface of a surface film, an in-mold molding, and a food container. <P>SOLUTION: In an in-mold label 13 as the laminated sheet, the surface film 32 and a substrate film 31 are laminated. A through hole 41 is formed in the surface film 32, and one end of the through hole 41 is closed by the substrate film 31. On the outer surface of the surface film 32, a padding part 42 is formed along the rim of the through hole 41. The surface film 32 is formed from a transparent or translucent synthetic resin. A print layer is formed between the substrate film 31 and the surface film 32. The in-mold label 13 has a first region 36 having the through hole 41 and a second region 37 having the print layer. The food container 11 has a bottomed cylindrical container main body 12 having a bottom wall, a peripheral wall 22, and the in-mold label 13 stuck on the outside surface of the peripheral wall 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention mainly relates to a laminated sheet attached to the surface of an in-mold (insert) molded product, and an in-mold molded product and a food container provided with the laminated sheet.

  Conventionally, for example, a cup disclosed in Patent Document 1 is known as a molded product including this type of laminated sheet. This cup is formed of a sheet material, and has a bottom plate and a cylindrical side plate attached in close contact with the bottom plate, and the outer surface of the side plate is formed in an uneven pattern. Furthermore, the outer surface of the said side plate is comprised with the paper in which the said uneven | corrugated pattern was formed by embossing. This cup is not slippery when it is held in the hand, and can be easily taken out without being in close contact with each other when automatically and sequentially taking out many overlapping empty cups with a vending machine or the like. ing.

On the other hand, Patent Document 2 discloses a heat insulating cup in which a heat insulating band is wound around a cup outer peripheral surface. The heat insulating cup is formed by winding and fixing a heat insulating band in which a large number of independent protrusions are dispersed in the vertical and horizontal directions on the outer peripheral surface of the upper spread cup, and between the inner surface of the large number of protrusions and the cup outer peripheral surface. A large number of independent hollow portions are formed in the vertical and horizontal directions. In addition, it is possible to disperse the concave portions instead of the protrusions. And with this heat insulation cup, it is possible to safely carry even a heavy cup containing hot things, etc., to be able to carry it safely, to allow many cups to be stacked, and to provide a heat insulation band on the outer peripheral surface of the cup. It can be adapted and bend easily.
Japanese Utility Model Publication No. 6-80616 JP 2003-88457 A

  However, both of the conventional cup and the heat insulating cup are designed to form a concavo-convex shape on the outer surface by applying predetermined processing to a piece of paper or heat insulating band. For this reason, in these cups and heat insulating cups, it is remarkably large that the difference in height between the tops of the concavo-convex shape (portions protruding outwards) and the valleys (portions recessed most inwards) is increased. It was difficult. Furthermore, since the concavo-convex outer surface connecting the top and the valley is difficult to form a sudden concavo-convex change, it has to be formed smoothly, and high anti-slip performance has been difficult to be exhibited.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a laminated sheet, an in-mold molded product and a food container excellent in anti-slip performance on the outer surface of the surface film.

  In order to achieve the above object, the invention of a laminated sheet according to claim 1 is a laminated sheet in which a surface film and a base film are laminated, and the surface film has through-holes formed therein, One end of the through hole is blocked by the base film.

  The invention of the laminated sheet according to claim 2 is the invention according to claim 1, wherein a buildup portion is provided on the outer surface of the surface film, and the buildup portion is provided along a peripheral edge of the through hole. It is characterized by being.

  The invention of the laminated sheet according to claim 3 is characterized in that, in the invention of claim 1 or 2, the inner surface of the surface film facing the base film is constituted by a flat surface. It is.

  The invention of the laminated sheet according to claim 4 is the invention according to any one of claims 1 to 3, wherein the surface film is made of a transparent or translucent synthetic resin and the base film. And a surface film are provided with a printing layer.

  The invention of the laminated sheet according to claim 5 is the invention according to claim 4, comprising a first region having a plurality of the through holes and a second region having the printing layer. It is characterized by.

  The invention of an in-mold molded product according to claim 6 is an in-mold molding comprising a laminated sheet in which a surface film and a base film are laminated, and a molded layer formed on the base film side of the laminated sheet. The surface film is provided with a through hole, and one end of the through hole is blocked by the base film.

  The invention of a food container according to claim 7 is a food container comprising a bottomed cylindrical container body having a bottom wall and a side wall, and a laminated sheet attached to the outer surface of the side wall. The laminated sheet is formed by laminating a surface film and a base film, and is attached to the outer side surface of the side wall via the base film, and further, a through hole is provided in the surface film, One end of the through hole is blocked by the base film.

  According to the laminated sheet of the present invention, the anti-slip performance of the outer surface of the surface film is excellent. According to the in-mold molded product and the food container of the present invention, the anti-slip performance on the surface provided with the laminated sheet is excellent.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings.
As schematically shown in FIGS. 1 and 2, a food container 11 as an in-mold molded product of an embodiment includes a container main body 12 formed into a bottomed cylindrical shape with a synthetic resin, and a side surface of the container main body 12. And an in-mold label 13 as a laminated sheet attached thereto. The container body 12 is preferably made of a thermoplastic resin such as polypropylene (PP), polystyrene (PS), or polyethylene (PE). In addition, each drawing is drawn exaggerating rather than the actual shape in order to make a characteristic part easy to illustrate.

  The container main body 12 includes a bottom wall 21 formed in a disk shape and a peripheral wall 22 as a side wall erected along the periphery of the bottom wall 21. The peripheral wall 22 is formed in a tapered shape that inclines toward the outside of the container body 12 toward the upper side. As shown in FIG. 3, an upper peripheral flange 23 extending outward of the container body 12 along the upper edge of the peripheral wall 22 is provided at the upper end of the peripheral wall 22 to increase the strength of the upper portion of the container body 12. ing.

  As shown in FIGS. 4 and 5 (c), the in-mold label 13 is a long square trapezoidal shape (laminated sheet) made of a sheet material (laminated sheet) in which a base film 31 and a surface film 32 made of a thermoplastic resin are laminated. It is formed in a fan shape covering the entire peripheral wall 22. As shown by a frame surrounded by a dotted line in FIG. 4, the in-mold label 13 includes a first region 36 including a plurality of concave and convex portions 35 and a second region 37 that functions as a display unit. Yes. The second region 37 is a region where characters, symbols, pictures, etc. for grasping the food in the food container 11 are displayed from the outside of the food container 11. The thickness of the in-mold label 13 (laminated sheet) may be less than 0.25 mm.

  On the surface of the first region 36, a large number of concave and convex portions 35 are arranged in parallel so as to form a staggered pattern vertically and horizontally at a predetermined interval. In the present embodiment, the distance d1 between the uneven portions 35 adjacent in the horizontal direction in FIG. 4 is about 1.8 mm, and the shortest distance d2 between the uneven portions 35 adjacent in the vertical direction is about 0.8 mm. However, it is not necessary to be limited to these intervals.

  As shown in FIGS. 5 (b) and 5 (c), each concavo-convex portion 35 has an annular through hole 41 penetrating the surface film 32 and an annular shape along the periphery of the through hole 41 ( And a built-up portion 42 protruding in a donut shape. The through-hole 41 forms a recess in the uneven portion 35, and the built-up portion 42 forms a protrusion in the uneven portion 35. Since the surface of the first region 36 is provided with the concave and convex portion 35 composed of the through hole 41 and the built-up portion 42, the anti-slip performance is improved because fingers and the like are easily caught.

  The inner wall surface 41 a of the through hole 41 is formed to extend in a direction orthogonal to the surface of the base film 31. The hole diameters of these through holes 41 are preferably 350 to 450 μm because they have excellent anti-slip performance, but are not necessarily limited to these hole diameters. On the other hand, the protruding height h (shown in FIG. 5 (b)) of the build-up portion 42 changes appropriately depending on the material and thickness of the surface film 32, the hole diameter of the through hole 41, the manufacturing conditions of the through hole 41, and the like. However, it is usually formed to be equal to or less than the thickness of the surface film 32.

  The surface film 32 is composed of a film made of a thermoplastic resin. As the surface film 32, a polypropylene film, a polystyrene film, or the like is used. Since the uneven portion 35 can be easily formed, a stretched film is preferably used, and a biaxially stretched polypropylene film (OPP) or a biaxially stretched polystyrene. Film (OPS) is most preferably used. The stretched film is a film in which tension is applied to an unstretched film at an appropriate temperature and the orientation of molecules is increased along the tensile direction, and the optical properties are improved as compared with the unstretched film. The tensile strength in the direction is significantly improved. The biaxially stretched film is a film stretched biaxially in the machine direction and the transverse direction, and is a film that has no tensile strength and no directionality of elongation and is balanced in the longitudinal and transverse directions. Furthermore, this biaxially stretched film is excellent in strength, heat shrinkability, and transparency.

  Further, the surface film 32 is preferably made of a transparent or translucent thermoplastic resin in order to exhibit the function as the display section, and is transparent because the function as the display section is extremely good. Most preferably, it is made of a thermoplastic resin. Moreover, as thickness of this surface film 32, it is preferable that it is 20-100 micrometers, and it is more preferable that it is 20-40 micrometers. When the thickness of the surface film 32 is less than 20 μm, the anti-slip performance cannot be sufficiently improved because the through-hole 41 is shallow, and conversely, when it exceeds 100 μm, it is difficult to form the uneven portion 35.

  As schematically shown in FIGS. 5A and 5B, the concavo-convex portion 35 of the surface film 32 is formed by compressing compressed air heated to a predetermined temperature as indicated by an arrow in FIG. 5A. It is formed by locally feeding it into one of the surfaces aiming at the area surrounded by the dotted line in FIG. The temperature of the compressed air is preferably about 100 ° C., but it needs to be at least equal to or higher than the melting temperature of the thermoplastic resin constituting the surface film 32.

  At this time, the thermoplastic resin present in the region surrounded by the dotted line in FIG. 5A is instantaneously melted by contact with the compressed air, and the molten thermoplastic resin is blown in the direction of the compressed air. The through-hole 41 is formed by being blown away. Further, at this time, the blown thermoplastic resin moves along the through-hole 41 to the other surface of the surface film 32, and an annular lump is formed in the area around the through-hole 41 where the air flow is weak. It is accumulated. The lump of the thermoplastic resin becomes the build-up portion 42 by solidifying. Thus, the surface film 32 after the concavo-convex portion 35 is formed is, as schematically shown in FIG. 5B, the one surface (the surface on the side facing the base film 31 at the time of lamination, That is, the inner surface of the surface film 32 facing the base film 31 is a flat surface, and the other surface (the outer surface of the surface film 32) is an uneven surface having a built-up portion 42.

  On the other hand, the base film 31 is made of a synthetic resin film. The base film 31 is preferably made of a synthetic resin having a melting point higher than that of the synthetic resin constituting the container body 12. Further, since the base film 31 has good adhesion to the container body 12, it is preferable that the base film 31 is made of the same type of resin as the synthetic resin constituting the container body 12. Moreover, as thickness of this base film 31, it is preferable that it is 20-100 micrometers, and it is more preferable that it is 20-40 micrometers. When the thickness of the base film 31 is less than 20 μm, the strength of the in-mold label 13 is likely to decrease, and conversely, when it exceeds 100 μm, the flexibility of the in-mold label 13 is likely to decrease and is uneconomical. .

  As this base film 31, various barrier functions such as barrier properties (gas barrier properties, water vapor barrier properties), light shielding properties, ultraviolet shielding properties, etc., in accordance with the properties of the food contained in the food container 11; It is preferable that the display layer and the heat resistance are provided appropriately with a printing layer. In the present embodiment, the display function is provided.

  A printing layer (not shown) is formed in a thin layer on one surface of the base film 31 (the surface on the side facing the surface film 32 during lamination, that is, the inner surface of the base film 31 facing the surface film 32). Yes. This printing layer prints information such as the name of the food, the name of the product, the registered trademark, the name of the manufacturer, and the design and design stored in the food container 11 on the inner surface of the base film 31 by a known printing technique. Formed by. This print layer may be provided only in the second region 37 or may be provided on the entire base film 31. In the present embodiment, the print layer is provided only in the second region 37, and is configured so that the print layer does not cover the first region 36. At this time, there is an advantage that it is possible to completely eliminate the possibility that the display contents of the printed layer are difficult to visually recognize due to the uneven portion 35 provided in the first region 36.

  Furthermore, on one surface of the base film 31 (the inner surface of the base film 31 facing the surface film 32) or one surface of the surface film 32 (the inner surface of the surface film 32 facing the base film 31) The adhesive layer (not shown) for adhering the base film 31 and the surface film 32 to each other is preferably formed in a thin layer. This adhesive layer is formed by applying a known adhesive resin having adhesiveness to one surface of the base film 31 or one surface of the surface film 32. Alternatively, the adhesive layer can be formed by co-extrusion molding the synthetic resin constituting the base film 31 or the surface film 32 and the adhesive resin.

Next, the manufacturing method of the said food container 11 is demonstrated.
This food container 11 has an in-mold schematically shown in FIGS. 6A and 6B after the in-mold label 13 is rolled into a cylindrical shape so that the base film 31 is disposed on the inner surface side. In-mold molding is performed by an injection molding apparatus using a molding die 51.

  The mold 51 includes a fixed mold 52 and a movable mold 53 that moves so that the mold can be clamped and opened with respect to the fixed mold 52. Between the fixed mold 52 and the movable mold 53, a cavity 54 that forms the outer surface shape of the food container 11 is provided. An injection gate 56 for injecting synthetic resin (molten resin) constituting the container body 12 is provided at the center of the lower end of the cavity 54 on the fixed mold 52 side. The injection gate 56 is opened at the center of the bottom wall 21 of the container body 12.

  A side portion of the cavity 54 on the fixed mold 52 side is formed in a shape corresponding to the outer surface shape of the in-mold label 13 in a state of being rounded into the cylindrical shape. A plurality of air suction holes 57 for sucking air from the inside of the cavity 54 are opened at the side of the cavity 54 on the fixed mold 52 side. Not formed. Each of these air suction holes 57 communicates with a suction gate 58 provided on one side of the fixed mold 52. The suction gate 58 is connected to suction means (not shown) configured to suck air in the direction indicated by the arrow in FIG.

  Now, when in-mold molding the food container 11 using this in-mold molding die 51, first, the in-mold label 13 is rounded into a cylindrical shape as described above, and then the shape is formed. Is inserted into the cavity 54 of the fixed mold 52 while maintaining the above. Subsequently, the suction means is operated, and air is sucked from the air suction holes 57 through the suction gates 58, whereby the in-mold label 13 is adsorbed and attached to the side of the fixed mold 52. At this time, as shown in FIG. 6A, the lower edge of the in-mold label 13 is brought into contact with the lower end of the cavity 54 on the fixed mold 52 side, and the upper end of the in-mold label 13 is fixed to the fixed mold. It arrange | positions in the state which protruded slightly upwards rather than the parting surface (PL surface) of the type | mold 52. FIG.

  Next, after the movable mold 53 is moved and clamped with respect to the fixed mold 52, the molten resin is injected from the injection gate 56 into the cavity 54. At this time, the molten resin is filled upward in the cavity 54 while passing between the side portion of the cavity 54 on the moving mold 53 side and the inner surface (base film 31) of the in-mold label 13. After that, it proceeds outward at the upper end of the cavity 54 and forcibly presses the upper end of the in-mold label 13 outward. As a result, as shown in FIG. 6B, a peripheral wall 22 as a molding layer is formed on the inner surface of the in-mold label 13, and the upper end portion of the in-mold label 13 is the lower surface of the upper peripheral flange 23. Placed in. Finally, after the molten resin is solidified by cooling, the mold 51 is opened and the food container 11 as an in-mold product is taken out from the mold 51.

The effects exhibited by the above embodiment will be described below.
The in-mold label 13 of the embodiment is composed of a laminated sheet in which a base film 31 and a surface film 32 are laminated, and through holes 41 are provided in the surface film 32. In other words, in this in-mold label 13, a recess having a drilling depth corresponding to at least the thickness of the surface film 32 is formed on the outer surface of the surface film 32. Since this dent (especially the outer end of the dent) has a shape that is easily caught by a finger or the like, it plays a role in improving the anti-slip performance in the first region 36 provided with the dent (through hole 41). Plays.

  In particular, the recess is formed so as to extend in a direction orthogonal to the wall surface of the peripheral wall 22 of the container body 12 (substantially horizontal direction), and the inner wall surface 41 a of the through hole 41 constituting the inner surface of the recess is also formed on the peripheral wall 22. It is formed to extend in a direction orthogonal to the wall surface (substantially horizontal direction). The surface extending in the direction orthogonal to the wall surface of the peripheral wall 22 (substantially horizontal direction) is formed for the first time by penetrating the through hole 41 in the surface film 32. For example, one surface like the conventional cup is provided. It is almost impossible to stably form a surface extending in the horizontal direction only by folding the paper or making a ridge.

  In addition, since one end of the through hole 41 is closed by the base film 31, even when the surface of the in-mold label 13 on the base film 31 side is filled with a molten resin constituting the peripheral wall 22 of the container body 12. The molten resin does not enter the through-hole 41 and is not buried, and high anti-slip performance can be easily and reliably exhibited.

  Since the built-up portion 42 is provided at the periphery of the through hole 41, it becomes easy to increase the area of the surface extending in the direction orthogonal to the wall surface of the peripheral wall 22 (substantially horizontal direction) and the length in the horizontal direction. Further, the anti-slip performance can be further improved. Furthermore, since the build-up portion 42 itself protrudes with respect to the surface of the surface film 32 located in the vicinity thereof (a region where the build-up portion 42 is not provided), a higher anti-slip performance can be exhibited. Can do. That is, both the outer peripheral portion and the inner peripheral portion (the outer end portion of the through hole 41) of the build-up portion 42 greatly contribute to the anti-slip performance.

  In addition, the build-up portion 42 plays a role of appropriately forming a gap between the upper and lower in-mold labels 13 when a large number of in-mold labels 13 are stacked up and down. The handleability of the stacked in-mold label 13 can be made extremely good. In particular, the handleability includes good workability in the work of grasping the stacked in-mold labels 13 one by one and inserting them into the mold 51 when performing in-mold molding. In addition, since the in-mold labels 13 that are vertically adjacent to each other are not easily rubbed, there is an effect that the generation of static electricity can be effectively suppressed.

  -Since the inner surface of the surface film 32 which opposes the base film 31 is comprised by the flat surface, the adhesiveness between the base film 31 and the surface film 32 becomes remarkably favorable. Furthermore, since unexpected irregularities are less likely to be formed on the surface of the in-mold label 13 compared to the case where the inner surface of the surface film 32 is not a flat surface, the effect of improving the appearance is also exhibited. In particular, the difference in appearance when the printing layer is provided is large.

  -By forming the concavo-convex portion 35 on the surface film 32 using compressed air heated to a predetermined temperature, when the thermoplastic resin constituting the surface film 32 is melted, it tends to be a lump without forming a thread, The inner surface of the surface film 32 facing the base film 31 tends to be a flat surface. Furthermore, the thermoplastic resin in the form of a lump is extremely workable because it forms the build-up portion 42 as it is. Moreover, there is an advantage that the hole diameter of the through hole 41 can be adjusted remarkably easily by adjusting the region to which the compressed air is applied.

  The food container 11 according to the embodiment includes a bottomed cylindrical container body 12 having a bottom wall 21 and a peripheral wall 22, and an in-mold label 13 attached to the outer surface of the peripheral wall 22. For this reason, the anti-slip performance of the food container 11 on the outer surface of the peripheral wall 22 is remarkably enhanced by the uneven portion 35 of the in-mold label 13. Therefore, the convenience when eating and drinking while holding the food container 11 with fingers can be remarkably enhanced.

  Further, the uneven portion 35 provided in the food container 11 may cause condensation to adhere to the outer surface of the surface film 32 when a cold food such as a soft drink is accommodated. Is easy to enter the through-hole 41 and has an advantage that water does not easily drip from the lower end of the food container 11. Further, at this time, the moisture that has entered the through hole 41 is also useful for improving the anti-slip performance. In particular, when the fingers are in a dry state, the anti-slip performance can be effectively enhanced.

  The food container 11 is formed by an injection molding apparatus using a mold 51 for in-mold molding. In the molding method using the mold 51, it is easy to provide the food container 11 having an excellent display function with the printed layer at low cost. That is, conventionally, there has been known a technique in which minute irregularities such as a texture and a satin pattern are engraved in a cavity of a mold, and injection molding is performed using the mold, and then the surface of a container is printed. In this case, there is a tendency that printing is difficult to see due to the minute unevenness, and the mold cost is expensive. In addition, a container manufactured by inserting a flat in-mold label having no unevenness for slip prevention into the mold engraved with minute unevenness, and then injecting a molten resin into the mold. Is also known. In this case, it is quite difficult to engrave a texture or a satin pattern on the flat in-mold label only by the injection pressure of the molten resin, and the mold cost is high. Further, at this time, there is a problem that the in-mold label is easily displaced during molding. Therefore, the manufacturing method of the food container 11 using the in-mold mold 51 according to the present embodiment is a very excellent technique that can easily solve the various problems as described above. It can be said that there is.

  -Since the surface film 32 is comprised with the synthetic resin which has a light transmittance, and since the printing layer is provided between the base film 31 and the surface film 32, food names etc. from the exterior of the food container 11 Information can be clearly displayed. Furthermore, since the printed layer is disposed opposite to the peripheral wall 22 of the container body 12 with the base film 31 interposed, the heat of the molten resin constituting the peripheral wall 22 is hardly transmitted during in-mold molding. The print layer is less likely to be modified by heat.

  Since the second region 37 provided with the print layer is configured not to overlap the first region 36 provided with the uneven portion 35, the information displayed on the print layer is provided by the uneven portion 35. There is no possibility of appearing distorted, and an extremely clear display function can be exhibited. Further, at this time, when the food container 11 is gripped with fingers, the fingers are provided at a position where they can easily come into contact with the first region 36. When the food container 11 is gripped so that the finger comes into contact with the first region 36, the finger does not cover the second region 37, and the display function by the printed layer is very effectively performed. It will be possible to demonstrate.

In addition, this embodiment can also be changed and embodied as follows.
The uneven portion 35 is provided so as to be concentrated in the first region 36. In particular, when the food container 11 is lifted with a finger attached to the first region 36, the surface of the fingertip is preferably close enough to abut against the plurality of uneven portions 35 at the same time. Furthermore, it is preferable that the surface of the fingertip is dense so that it hardly contacts the surface of the surface film 32 other than the concavo-convex portion 35 located in the first region 36, and the surface of the fingertip is the first region 36. It is more preferable that they are densely packed so as not to come into contact with the surface of the surface film 32 other than the uneven portion 35 located inside. When comprised in this way, a high heat insulation effect can be exhibited in the side part of the container 11 for foodstuffs. In particular, the influence of finger body temperature can be reduced.

  The printing layer may be formed on one side of the base film 31 or the other side. Further, the printing layer may be formed on either one surface or the other surface of the surface film 32. At this time, it is preferable that the printed layer is not formed on the outer surface of the in-mold label 13 in order to suppress a decrease in display function due to rubbing of the surface.

  -The build-up part 42 may be omitted. That is, the through-hole 41 is formed through the surface film 32 by punching (mechanical cutting) using a known drilling jig. Even in such a configuration, since the through-hole 41 having a depth corresponding to the thickness of the surface film 32 is formed on the surface of the surface film 32, high anti-slip performance can be exhibited. In the case where the through hole 41 is formed by punching, it is most preferable to form the concavo-convex portion 35 by compressed air according to the above embodiment, because there is a possibility that punching flaws may occur and foreign matter may be mixed. .

The first region 36 and the second region 37 may partially or entirely overlap. For example, the printing layer and the uneven portion 35 may be provided over the entire in-mold label 13.
The first region 36 may be formed over the entire in-mold label 13, and in this case, high anti-slip performance can be exhibited over the entire peripheral wall 22 of the food container 11. Moreover, you may form the 2nd area | region 37 over the whole in-mold label 13, and it becomes possible to display many information on the surrounding wall 22 of the container 11 for foodstuffs in this case.

-It is not necessary to provide a printing layer between the surface film 32 and the base film 31.
-By providing a heat seal type adhesive layer on the surface of the base film 31 side of the in-mold label 13 or by applying a heat seal type adhesive (heat seal agent), You may comprise so that the surrounding wall 22 may be heat-seal | fused. When comprised in this way, the adhesiveness between the in-mold label 13 and the container main body 12 can be improved very effectively. For the heat-seal type adhesive layer, for example, a thermoplastic resin having a melting point lower than the melting point of the synthetic resin constituting the container body 12 is used, and preferably, a low melting point type OPP or OPS is used. At this time, the thickness of the adhesive layer is preferably about 20 to 40 μm.

  Further, at this time, the printing layer provided between the surface film 32 and the base film 31 is omitted, and a printing layer is provided between the base film 31 and the heat seal type adhesive layer. It doesn't matter.

  The in-mold label 13 is constituted by the surface film 32 and the heat seal type adhesive layer. That is, in the in-mold label 13 of the above embodiment, a heat seal type adhesive layer is provided instead of the base film 31. At this time, a printing layer may be provided between the surface film 32 and the heat seal type adhesive layer.

  -In the in-mold label 13 of the said embodiment, you may comprise the base film 31 with a polyethylene terephthalate (PET) resin. At this time, the printing layer may be provided on either the front or back surface of the PET layer made of PET resin. The thickness of the PET layer is preferably 10 to 20 μm, more preferably 10 to 15 μm, and still more preferably about 12 μm. In addition, the base film 31 made of the PET resin may be made of silica-deposited PET, alumina-deposited PET, or aluminum-deposited PET in order to improve design properties.

  -Paper or foil (aluminum foil) may be used as the base film 31. When using an aluminum foil as the base film 31, the base film 31 may be formed to a thickness of about 7 to 12 μm.

-You may apply the in-mold label 13 to the in-mold molded product used for uses other than the container 11 for foodstuffs.
-A vacuum formed product, a compressed air molded product, a vacuum compressed air molded product, or a press molded product may be manufactured by vacuum forming, compressed air forming, vacuum compressed air forming, or press forming the laminated sheet of the above embodiment. When constituted in this way, it becomes possible to provide a vacuum molded product, a compressed air molded product, a vacuum compressed air molded product or a press molded product excellent in anti-slip performance.

Further, the technical idea that can be grasped from the embodiment will be described below.
The laminated sheet according to any one of claims 1 to 5, wherein the through hole is formed so as to extend in a direction orthogonal to the base film.

The perspective view which shows typically the container for foodstuffs of embodiment. Sectional drawing which shows the container for foodstuffs of embodiment typically. The partial expanded sectional view which expanded some food containers of an embodiment. The expanded view which shows the in-mold label of embodiment typically. (A) And (b) is a perspective view which shows typically the cross section of the surface film of embodiment, (c) is a perspective view which shows typically the cross section of the in-mold label of embodiment. (A) And (b) is sectional drawing which shows typically the metal mold | die for in-mold shaping | molding of embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Food container as an in-mold molded product, 12 ... Container main body, 13 ... In-mold label as a laminated sheet, 21 ... Bottom wall, 22 ... Perimeter wall as a side wall, 31 ... Base film, 32 ... Surface film, 36 ... 1st area | region, 37 ... 2nd area | region, 41 ... Through-hole, 42 ... Overlaying part.

Claims (7)

A laminated sheet in which a surface film and a base film are laminated,
A laminate sheet, wherein a through hole is provided in the surface film, and one end of the through hole is closed by the base film. The laminated sheet according to claim 1, wherein a built-up portion is provided on an outer surface of the surface film, and the built-up portion is provided along a peripheral edge of the through hole. The laminated sheet according to claim 1 or 2, wherein an inner surface of the surface film facing the base film is a flat surface. The surface film is made of a transparent or translucent synthetic resin, and a printing layer is provided between the base film and the surface film. The laminated sheet according to item. The laminated sheet according to claim 4, comprising a first region having a plurality of the through holes and a second region having the printed layer. An in-mold molded product comprising a laminated sheet in which a surface film and a base film are laminated, and a molded layer formed on the base film side of the laminated sheet,
A through-hole is formed in the surface film, and one end of the through-hole is closed by the base film. A food container comprising a bottomed cylindrical container body having a bottom wall and a side wall, and a laminated sheet attached to the outer surface of the side wall,
The laminated sheet is constructed by laminating a surface film and a base film, and is attached to the outer surface of the side wall via the base film,
Furthermore, a through-hole is provided in the surface film, and one end of the through-hole is closed by the base film.

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