WO2013161403A1 - インモールド成形用ラベル及びラベル付き容器 - Google Patents
インモールド成形用ラベル及びラベル付き容器 Download PDFInfo
- Publication number
- WO2013161403A1 WO2013161403A1 PCT/JP2013/056589 JP2013056589W WO2013161403A1 WO 2013161403 A1 WO2013161403 A1 WO 2013161403A1 JP 2013056589 W JP2013056589 W JP 2013056589W WO 2013161403 A1 WO2013161403 A1 WO 2013161403A1
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- WIPO (PCT)
- Prior art keywords
- label
- layer
- adhesive layer
- container body
- mold molding
- Prior art date
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- 229920003002 synthetic resin Polymers 0.000 claims abstract description 18
- 239000000057 synthetic resin Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000010410 layer Substances 0.000 claims description 86
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- 238000000034 method Methods 0.000 claims description 25
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- 238000007639 printing Methods 0.000 claims description 16
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- 239000011241 protective layer Substances 0.000 claims description 11
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- 230000037303 wrinkles Effects 0.000 abstract description 22
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Images
Classifications
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- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
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- B65D23/00—Details of bottles or jars not otherwise provided for
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- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
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- B29C49/2408—In-mould lining or labelling
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- G—PHYSICS
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- G09F2003/0272—Labels for containers
- G09F2003/0273—Labels for bottles, flasks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the present invention relates to an in-mold molding label that is used as an insert material and is affixed to a peripheral wall of the container body at the same time as the molding of the container body, and a container with a label to which this label is affixed.
- a means of sticking a label printed with a decorative pattern, product name, description, etc. is frequently used.
- a so-called in-mold molding label (hereinafter sometimes simply referred to as a label) is set in the mold in advance as an insert material, and the container body is molded.
- the container body is attached to the surface of the peripheral wall.
- Patent Document 1 describes an invention relating to a label, a blow-molded article with a label, and a manufacturing method thereof.
- FIG. 13 is a longitudinal sectional view showing three examples of the basic layer structure of an in-mold forming label that has been generally used conventionally.
- the label 111 of (a) is gravure printed on the back side of a transparent base material layer 112 made of an unstretched cast film (hereinafter abbreviated as CPP film) made of polypropylene (hereinafter abbreviated as PP) resin.
- CPP film unstretched cast film
- PP polypropylene
- the label 111 of (b) forms a printing layer 113 by gravure printing on the back surface of a transparent base material layer 112 made of a CPP film, and an adhesive layer 116 made of a copolymer PP resin film via a dry laminate layer 115. Laminated.
- an adhesive layer 116 made of a heat seal layer is laminated on the back side of a base material layer 112 made of synthetic paper, a printed layer 113 is formed by flexographic printing on the front side, and the printed layer 113 is made transparent. It is covered with a protective layer 117.
- the region where the label as described above is pasted is conventionally limited to a two-dimensional curved surface, and it is difficult to stick to a wide range including a three-dimensional curved surface such as a spherical arc shell. That is, a three-dimensional curved surface is a curved surface that cannot be formed by simply curving a planar label. If an attempt is made to forcibly affix a planar label to a three-dimensional curved surface by in-mold molding, an air stagnation or wrinkle There is a problem that the appearance is easily damaged. If the label can be attached to the three-dimensional curved surface, there is an advantage that the display area can be enlarged, the display amount can be increased, or the characters and the like can be enlarged.
- the present invention creates an in-mold molding label that can be attached to a wide area of a peripheral wall including a three-dimensional curved surface area of a synthetic resin container in a high-quality state without air accumulation and wrinkles. It is to be an issue.
- the main structure of the label of the present invention according to the means for solving the above technical problem is: In-mold molding label that is used as an insert material and is attached to the peripheral wall of the container body simultaneously with the molding of the synthetic resin container body, It has an adhesive layer that adheres to the peripheral wall of the container body, This adhesive layer is a back surface side with embossed recesses arranged in a regular pattern, The average depth of the recesses is in the range of 0.02 to 0.1 mm, The average number of recesses per 1 cm 2 of surface area of the label is in the range of 25-2500, The sum of the spatial volumes of the recesses per 1 cm 2 of the surface area of the label is in the range of 0.001 to 0.005 cm 3 It is said.
- the depth of the recess is measured by observing the cross section of the label with a microscope. Further, the number of concave portions per 1 cm 2 of the surface area of the label is obtained by enlarging the adhesive surface of the label with a microscope and counting the number of concave portions. Also, the sum of the space volume of the recesses per 1 cm 2 of the surface area of the label is calculated by calculating the volume space per recess from the shape and depth of the recess and multiplying this by the number of recesses per 1 cm 2 of the surface area of the label. To do.
- the inventors of the present application examined the adhesiveness of the in-mold label to the three-dimensional curved region of the peripheral wall of the synthetic resin container body.
- a three-dimensional curved region is obtained by disposing concave portions in a regular pattern by embossing on the back side of the adhesive layer that adheres to the peripheral wall of the container body, and setting the depth, number, and volume of these concave portions within an appropriate range.
- the average depth of the recesses is in the range of 0.02 to 0.1 mm
- the average number of recesses per 1 cm 2 of the surface area of the label is in the range of 25 to 2500
- the total sum of the spatial volumes of the recesses per 1 cm 2 of the surface area of the label within the range of 0.001 to 0.005 cm 3 . It is possible to effectively suppress the occurrence of air accumulation and wrinkles in the three-dimensional curved region of the peripheral wall of the container body, and it is possible to provide a labeled container with a label attached in a high quality state.
- the term “back side” or “front side” is used to clearly describe the layer configuration of the label.
- the back side refers to the side that adheres to the peripheral wall of the container body.
- the surface side indicates the opposite side, that is, the side exposed to the outside in a state of being attached to the container body.
- the average depth of the recesses is less than 0.02 mm, or when the total volume of the recess spaces per 1 cm 2 of surface area is less than 0.001 cm 3 , or when the number of recesses per 1 cm 2 of surface area exceeds 2500 After sticking, air is trapped particularly in the three-dimensional curved surface area, and wrinkles are likely to occur.
- the average depth of the recess is greater than 0.1 mm, or the sum of the space volume of the recesses per surface area 1 cm 2 is more than 0.005 cm 3, or the number of recesses per surface area 1 cm 2 is less than 25 If it is, printing becomes unclear and the appearance is deteriorated. There is also a problem that the adsorbability at the time of inserting the label into the mold is lowered.
- the label in order to smoothly adhere a flat label to the 3D curved area of the container while suppressing air accumulation and wrinkles by in-mold molding, the label can be deformed along the 3D curved surface of the container. It is necessary to give a good followability, In order to provide such followability, it is necessary that the depth of the recesses is a certain depth or more, and an appropriate number of recesses of an appropriate size are regularly arranged. With the above configuration, the embossed recesses are arranged in a regular pattern, and the label is deformed along a three-dimensional curved surface by setting the depth of the recesses, the number of recesses, and the total volume of the recesses within a predetermined range. Possible followability, Combined with the sufficient function of air escape by the recesses, it is possible to effectively suppress the accumulation of air and the generation of soot.
- the G value calculated by the following formula (1) in the above main configuration is in the range of 0.05 to 0.20.
- G E * t 3 (1)
- E and t are as follows.
- the above configuration is a requirement for further sufficiently imparting the followability of deformation along the three-dimensional curved surface of the container of the label from the index relating to the stiffness of the label, that is, the bending rigidity of the label,
- the G value calculated from the equation (1) which is a value correlated with the bending rigidity of the label, is in the range of 0.05 to 0.20, particularly 0.20 or less.
- Still another configuration of the label of the present invention is that, in the main configuration described above, the ratio of the area of the recess to the total surface area of the label is in the range of 10 to 70%.
- the ratio of the area of the recess to the area of the entire label is preferably in the range of 10 to 70%.
- Still another configuration of the label of the present invention is that in the main configuration described above, it has a concavo-convex structure over the entire thickness direction due to a concave portion formed by embossing.
- the depth of the recess is sufficiently deep without being limited to the thickness of the adhesive layer within the range shown in the main configuration. This makes it possible to more effectively give the label followability.
- Still another configuration of the label of the present invention relates to an example of a specific layer configuration of the label having the above main configuration, Using a synthetic resin film having transparency as a base material layer, Form a printing layer on the back side of the base material layer, Furthermore, an adhesive layer made of a synthetic resin that can be directly heat-sealed to the peripheral wall of the container body by an extrusion lamination method through an anchor coat layer (hereinafter referred to as an AC layer) from the back side of the printed layer is laminated, In the state where the base material layer, the printing layer, and the adhesive layer are laminated and the adhesive layer is cooled and solidified, a recess is formed on the back side of the adhesive layer by embossing.
- an AC layer anchor coat layer
- Still another configuration of the label of the present invention relates to an example of a specific layer configuration of the label which also has the main configuration described above,
- a synthetic resin film that can be directly heat-sealed to the peripheral wall of the container body is used as an adhesive layer.
- a protective layer made of synthetic resin by the extrusion lamination method is laminated through the AC layer,
- the adhesive layer, the printing layer, and the protective layer are laminated, and a recess is formed on the back surface side of the adhesive layer by embossing in a state where the protective layer is cooled and solidified.
- the main structure of the labeled container of the present invention is as follows.
- the peripheral wall of the container body has a three-dimensional curved region formed in a three-dimensional curved shape,
- the label is attached to an area including the three-dimensional curved surface area of the peripheral wall of the container body, and is adhered to the entire area of the adhesive area along the shape of the peripheral wall.
- a container with a label that has been adhered in a close-contact manner along the shape of the peripheral wall that is, a label that has been adhered to a high-grade state without air accumulation, wrinkles, or peeling over the entire region of the adhesion region. Can be provided.
- Another structure of the labeled container of the present invention is that the depth of the concave portion of the label after molding is in the range of 0.01 to 0.08 mm.
- the concave portion of the label by forming the concave portion of the label sufficiently deep after molding, a space formed between the concave portion of the adhesive layer and the wall surface of the container remains.
- the air between the parison wall and the label can be effectively escaped without causing the recess to be greatly crushed by heat, and the capacity to absorb the space formed by the recess is increased so that the air that has not escaped into the recess. Since it can take in and absorb, generation
- the in-mold molding label of the present invention has concave portions arranged in a regular pattern by embossing on the back side of the adhesive layer that adheres to the peripheral wall of the container body, and the depth, number, and total volume of these concave portions are predetermined.
- the label can be provided with followability that can be deformed along a three-dimensional curved surface. Combined with the function of air escape by the recess and the ability to absorb the air that could not be escaped, it effectively suppresses the accumulation of air and wrinkles in the three-dimensional curved surface area.
- Can The three-dimensional curved surface region of the peripheral wall of the container body can be attached with high quality without air accumulation or wrinkles.
- FIG. 1A is a plan view
- FIG. 1B is a plan sectional view taken along the line AA in FIG. 2
- FIG. 1C is a bottom view.
- FIG. 1C is a bottom view.
- FIG. 1 drawing which shows the layer structure of Example 1 of the label of this invention.
- It is a top view which shows the arrangement
- 6 is a cross-sectional view showing a layer structure of a label of Comparative Example 1.
- FIG. 1A is a plan view
- FIG. 1B is a plan sectional view taken along the line AA in FIG. 2
- FIG. 1C is a bottom view.
- It is sectional drawing which shows the layer structure of Example 1 of the label of this invention.
- It is a top view which shows the arrangement
- FIG. It is a top view which shows the arrangement
- FIG. It is a schematic explanatory drawing of the process for shape
- FIG. 1 is a perspective view seen from the side
- FIG. 2 is a front view
- FIG. 3 is a side view
- FIG. (B) is a plane sectional view taken along the line AA in FIG. 2
- (c) is a bottom view
- FIG. 5 is a cross-sectional view showing the layer structure of Example 1 of the in-mold molding label of the present invention used in this labeled container
- FIG. 6 shows the arrangement of the recesses 19 as viewed from the back side of the label of FIG.
- FIG. 1 It is a top view which shows an installation pattern.
- the labeled container shown in FIG. 1 is obtained by sticking the label 11 shown in FIGS. 5 and 6 on the peripheral wall of the container body 1 to both the front and back surfaces of the container by an in-mold molding method.
- the container body 1 is a direct blow-molded product made of high-density polyethylene (HDPE) resin, and is a casing having a cylindrical mouth tube part 2, a shoulder part 3, an elliptical cylindrical body part 4 and a bottom part 5, and has an overall height. It has a capacity of 155 mm, a capacity of 230 ml, and an average thickness of the body 4 of 0.80 mm.
- the body 4 of the container body 1 has an oval cylindrical shape as a whole, but has a shape that is gradually reduced in diameter from the upper end to the lower end, and its peripheral wall is curved in the longitudinal direction as well as in the circumferential direction.
- the outer peripheral surface 4 is a three-dimensional curved surface region having a three-dimensional curved surface over substantially the entire range.
- the label 11 is adhered in close contact along the three-dimensional curved surface in a wide range including the three-dimensional curved region from the upper end to the lower end on the front side of the body 4 of the container body 1.
- the area is attached with high quality without air accumulation, wrinkles or peeling.
- the label 11 has a layer structure of base material layer 12 / printing layer 13 / AC layer 14 / adhesive layer 16 from the surface side (from the upper side in the figure).
- the base material layer 12 is made of a transparent CPP film, has a layer thickness of 0.070 mm, and the adhesive layer 16 is obtained by laminating a low density polyethylene (LDPE) resin by an extrusion laminating method.
- LDPE low density polyethylene
- the outline of the manufacturing process of the label 11 shown in FIG. 5 is as follows. 1) The printing layer 13 is printed on the back side of a transparent CPP film. 2) An anchor coating agent is applied from the back side of the printing layer 13 and dried to laminate the AC layer 14. 3) Further, an LDPE resin is laminated by an extrusion laminating method to form an adhesive layer 16. 4) After the adhesive layer 16 is cooled and solidified with a cooling roll, embossing is performed with an embossing roll having an embossed pattern from the back side of the adhesive layer 16. 5) After slitting, punching into a predetermined label shape is performed. In the label 11 of Example 1 shown in FIG.
- the total thickness of the label 11 is 0.085 mm
- the layer thickness of the adhesive layer 16 is 0.010 mm
- the average value of the depth d of the recess 19 is 0.00.
- the effect of embossing is not only on the adhesive layer 16 but also on the entire thickness of the label 11, and the entire label 11 has an uneven structure in the thickness direction.
- the AC layer 14 is a layer for strengthening the adhesion between the printed layer 13 and the adhesive layer 16.
- the adhesive layer 16 in which the LDPE resin is laminated by the extrusion laminating method is thermally fused directly to the peripheral wall of the HDPE resin container body 1 in the in-mold molding.
- the printing layer 13 can be formed by various printing methods such as gravure printing, screen printing, flexographic printing, and the like.
- the anchor coating agent for example, polyethyleneimine, polyether polyol / polyisocyanate, polyester polyol / polyisocyanate or the like diluted with water or an organic solvent can be used.
- FIG. 6 shows an arrangement pattern of the recesses 19 formed on the back surface side of the adhesive layer 16 by embossing, and the planar shape of the recesses 19 is a square shape, as shown in FIG.
- the entire surface of the label 11 is arranged in a regular pattern so as to be surrounded by the flat portion 19f.
- Numerical values that serve as indicators of the arrangement of the recesses 19 are as follows. -The average value of the depth d of the recess 19 is 0.060 mm.
- the ratio of the total area of the recesses 19 to the total surface area of the label 11 (hereinafter referred to as area ratio Atr) is 46%.
- the number of the concave portions 19 per 1 cm 2 of the surface area of the label 11 (hereinafter referred to as the number Nt) is 324 pieces / cm 2.
- the total volume per 1 cm 2 of the surface area of the label 11 (hereinafter referred to as the total volume Vt) is 0.002 cm 3 / cm 2 Moreover, the average value of the depth d of the recessed part 19 after sticking to the surrounding wall of the container main body 1 was 0.030 mm as a result of slicing a cross section in the part which the label stuck, and magnifying and observing with a microscope.
- the thickness t of the label is a thickness at a portion where the concave portion 19 is not formed by embossing.
- the tensile modulus was obtained by punching the label into an ASTM-1822L dumbbell shape and conducting a tensile test at a tensile speed of 1 mm / min.
- the vertical direction of the label corresponds to the axial direction of the container body when the label is attached to the container body, and the horizontal direction corresponds to a direction perpendicular thereto.
- FIG. 10 is a schematic explanatory diagram of the process of the in-mold molding method for molding the labeled container of the above embodiment.
- a cylindrical HDPE resin parison 22 is extruded from a die 21 and the upper and lower sides thereof are sandwiched by a blow molding split mold 23.
- the label 11 is preliminarily adsorbed to the mold surface by the reduced pressure intake passage 24, but the portion corresponding to the three-dimensional curved surface area is not necessarily in contact with the mold surface and is partially in a floating state. In this state, when blown air is blown, the parison 22 expands (see the arrow direction in FIG. 10) and is shaped sequentially along the shape of the cavity (see the state of the two-dot chain line in FIG. 10). Is attached to the peripheral wall of the body 4 in an integrated state.
- the adhesive layer 16 of the label 11 is adhered to the surface of the peripheral wall of the body portion 4 of the container body 1 in a heat-welded manner in in-mold molding.
- the planar label 11 is the three-dimensional curved surface. Adhesion progresses while deforming along the air, and air accumulation, wrinkles, and peeling are more likely to occur than when sticking to a two-dimensional curved surface.
- the concave portion 19 sufficiently exhibits a function as an air escape path at the time of in-mold molding, and the occurrence of air accumulation, wrinkles and peeling can be effectively suppressed.
- FIG. 7 is a cross-sectional view showing the layer structure of Example 2 of the in-mold molding label of the present invention, from the surface side (from the upper side in the figure), protective layer 17 / AC layer 14 / printing layer 13 / adhesion.
- the adhesive layer 16 is made of a CPP film, has a layer thickness of 0.070 mm, and the protective layer 17 is obtained by laminating an LDPE resin by an extrusion lamination method.
- the layer thickness is 0.010 mm, and the average thickness of the entire label 11 is 0.00.
- the layer configuration is 085 mm, and the layer configuration of the label 11 of Example 1 shown in FIG. In the above configuration, the adhesive layer 16 also functions as the base material layer 12.
- the outline of the manufacturing process of the label 11 shown in FIG. 7 is as follows. 1) The CPP film that can be directly heat-sealed to the wall surface of the container body 1 is used as the adhesive layer 16, and the printing layer 13 is printed on the surface side of the adhesive layer 16. 2) Further, an anchor coating agent is applied and dried to laminate the AC layer 14. 3) Further, an LDPE resin is laminated on the surface side by an extrusion laminating method to form a protective layer 17 that prevents the printed layer 13 from being damaged. 4) After the protective layer 17 is cooled and solidified with a cooling roll, embossing is performed on the back side of the adhesive layer 16 with an embossing roll having an embossing pattern.
- Table 1 in FIG. 11 is prepared for comparison with the label of Example 1 (L1) shown in FIG. 5 and the label of Example 2 (L2) shown in FIG.
- Comparative Examples 1, 2, 3, and 4 (Lc1, Lc2, Lc3, and Lc4)
- the layer configuration, and an indicator of the arrangement mode of the recesses 19 formed on the back side of the adhesive layer 16 by embossing 6 is a table summarizing values of depth d, area ratio Atr, number Nt, total volume Vt, and G value.
- Table 2 in FIG. 12 uses six types of labels L1, L2, Lc1, Lc2, Lc3, and Lc4 shown in Table 1 in FIG. 11, and the in-mold molding method shown in FIG.
- Example 1 the configuration label shown in FIG. 5 was used, and in Example 2 (B2), the configuration label shown in FIG. 7 was used.
- Comparative Examples 1, 2, 3, and 4 referred to as Bc1, Bc2, Bc3, and Bc4, labels of Lc1, Lc2, Lc3, and Lc4 shown in FIG. 11 were used.
- FIG. 8 is a sectional view showing the layer structure of the label 11 of Lc1.
- the Lc1 label 11 has the same layer structure as the L1 label as shown in Table 1 of FIG. 11, and the arrangement pattern of the recesses 19 is the same as the pattern shown in FIG.
- the adhesive layer 16 formed by laminating the LDPE resin by the method is cooled and solidified at the same time with a cooling roll having an embossed pattern, and embossed at the same time. Looking at the numerical value that remains on the adhesive layer 16 of 020 mm and is an indicator of the arrangement mode, the depth d is about 0.015 mm, and the area ratio Atr and the number Nt are the same as the labels of L1 and L2, The total volume Vt remains small.
- the Lc2 label has a layer structure in which a heat seal (HS) layer is formed on the back side of a base layer made of synthetic paper and then embossed with an emboss roll to form an adhesive layer.
- the arrangement pattern is the pattern shown in FIG. 9, and the number Nt is increased and the area of each square-shaped recess 19 is reduced compared to the L1 and L2 label patterns shown in FIG. It is said.
- the Lc3 label is obtained by dry laminating an adhesive layer made of a copolymer PP resin film (Co-PP film), which is embossed on the back side in advance through a dry laminate layer (DL layer) on a CPP film base layer.
- the Lc4 label has a depth d, an area ratio Atr, a number Nt, and a total volume Vt, which are indicators of the layer configuration and the arrangement mode of the recesses 19, and is bonded to the base material layer 12 in the same manner as the L1 label.
- the thickness of the layer 16 is increased, and the average thickness of the entire label 11 is 0.105 mm.
- the recesses 19 are almost disappeared in the in-mold molding process at less than 0.010 mm below the measurement limit, and the function of the recesses 19 as an air escape path during in-mold molding.
- the followability that enables deformation along a three-dimensional curved surface is small, and the function of suppressing the generation of wrinkles and air accumulation is insufficient.
- the concave portion 19 is formed in a regular pattern by embossing as in the Lc1 label. It is not enough to arrange with It can be seen that the concave portions having a depth in a predetermined range are arranged in a regular pattern, and that the number Nt of these concave portions and the total volume Vt need to be within a predetermined appropriate range.
- the layer configuration and the arrangement of the recesses 19 are the same. If the average thickness is increased and the G value is a large value exceeding 0.20, the elasticity of the label becomes too large and the followability to deformation along the shape of the three-dimensional curved region of the container is insufficient. Thus, there is no occurrence of air accumulation, but it can be seen that wrinkles easily occur on the sticking surface. Therefore, when the label is actually put into practical use, after determining the layer configuration and the arrangement of the recesses 19 as described above, the G-value is used as an index to set the overall strength of the label to an appropriate size. It is preferable to keep it.
- the label of this invention and the container with a label are not limited to these Examples.
- the container main body is formed by direct blow molding, but may be formed by biaxial stretch blow molding or thermoforming.
- the layer structure of the label can be appropriately selected from variations of various layer structures in consideration of the combination with the synthetic resin used for the container body in addition to those shown in Examples 1 and 2.
- the regular arrangement pattern of the recesses can be appropriately selected from various variations in addition to the patterns shown in FIGS.
- the in-mold molding label of the present invention can be attached to the three-dimensional curved surface area of the peripheral wall of the container body with high quality without air accumulation or wrinkles. Labeled containers are expected to be used in a wide range as containers decorated in an unprecedented manner.
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Abstract
Description
(a)のラベル111は、ポリプロピレン(以下、PPと略記する。)樹脂製の無延伸のキャストフィルム(以下、CPPフィルムと略記する。)からなる透明な基材層112の裏面側にグラビア印刷による印刷層113を形成し、さらに押出しラミネート法によるポリエチレン系樹脂製の接着層116を積層したものである。
(b)のラベル111は、CPPフィルムからなる透明な基材層112の裏面にグラビア印刷による印刷層113を形成し、ドライラミネート層115を介して共重合系PP樹脂フィルム製の接着層116を積層したものである。
(c)のラベル111は、合成紙からなる基材層112の裏面側にヒートシール層による接着層116を積層し、表面側にフレキソ印刷による印刷層113を形成し、さらに印刷層113を透明な保護層117で被覆したものである。
すなわち、3次元曲面は平面形状のラベルを単に湾曲させることでは形成させることができない曲面であり、平面形状のラベルをインモールド成形で3次元曲面に強引に貼着しようとすると、エア溜りや皺が発生し易く外観が毀損してしまうと云う問題があった。
3次元曲面にラベルを貼着することができれば、表示面積を拡大することができ、表示量を多くすることができる、あるいは文字等を大きくすることができる利点がある。
インサート材として使用され、合成樹脂製の容器本体の成形と同時に該容器本体の周壁に貼着されるインモールド成形用ラベルにおいて、
容器本体の周壁に接着する接着層を有し、
この接着層は、裏面側にエンボス加工による凹部が規則的なパターンで配設されたものであり、
凹部の平均深さを0.02~0.1mmの範囲とし、
ラベルの表面積1cm2あたりの凹部の平均個数を25~2500ケの範囲とし、
ラベルの表面積1cm2あたりの凹部の空間体積の総和を0.001~0.005cm3の範囲とする、
と云うものである。
また、ラベルの表面積1cm2あたりの凹部の個数は、ラベルの接着面を顕微鏡で拡大し、凹部の個数をカウントする。
また、ラベルの表面積1cm2あたりの凹部の空間体積の総和は、凹部の形状、深さから凹部1個あたりの体積空間を算出し、それとラベルの表面積1cm2あたりの凹部の個数を乗じ、算出する。
容器本体の周壁に接着する接着層の裏面側にエンボス加工により規則的なパターンで凹部を配設し、これら凹部の深さ、個数、体積を適宜の範囲に設定することにより、3次元曲面領域でエア溜りや皺の発生のない状態で高品位な貼着が可能なことを見出し、上記構成を創出するに至った。
容器本体の周壁の3次元曲面領域でのエア溜りや皺の発生を効果的に抑制することができ、高品位な状態でラベルを貼着したラベル付き容器を提供することが可能となった。
なお、上記構成、また以下の説明では、ラベルの層構成を明確に記載するため裏面側あるいは表面側と云う用語を使用しているが、ここで裏面側は容器本体の周壁と接着する側を示し、表面側はその反対側、すなわち容器本体に貼着した状態で外部に露出する側を示す。
一方、凹部の平均深さが0.1mmを超えると、あるいは表面積1cm2あたりの凹部の空間の体積の総和が0.005cm3を超えると、あるいは表面積1cm2あたりの凹部の個数が25未満であると印刷が不鮮明となり外観性が低下してしまう。また、ラベルを金型に挿入する際の吸着適性が低下してしまうと云う問題もある。
このような追従性を付与するためには凹部の深さが一定以上あること、適宜の大きさの凹部が適当数、規則的に整列していることが必要であるが、
上記構成により、エンボス加工による凹部を規則的なパターンに配設させると共に、凹部の深さ、凹部の個数、凹部の総体積を所定の範囲とすることにより、ラベルに3次元曲面に沿って変形可能な追従性を付与することができ、
凹部による空気の逃げ道としての機能が十分に発揮されることと相俟って、エア溜まり、皺の発生を効果的に抑制することが可能となる。
G=E*t3 (1)
但し、E、tは、それぞれ次のようである。
E;ラベルの引張弾性率(MPa)
t;ラベル厚さ(mm)
上記構成により、ラベルの曲げ剛性に相関する値である、(1)式から算出されるG値を0.05~0.20の範囲とすることにより、特に0.20以下とすることにより十分に柔軟性を有するものとし、すなわち容器の3次元曲面に沿った変形について、十分に追従性を有するものとし、
前述した主たる構成におけるエンボス加工による凹部の配設態様による作用効果と相俟って、皺等の発生のない状態で高品位な貼着を可能とすることができる。
また、ラベルを貼着したラベル付き容器を誤って落下させた場合に、落下衝撃によりラベルの貼着周縁部を起点として割れが発生しやすくなると云う問題もある。
一方、腰強さの値が0.05未満の値になるとラベルを機械で金型面にセットする際のラベル自動供給性が低下する、またセット後溶融樹脂の流動によって皺が発生すると云う問題が生じる。
透明性を有する合成樹脂製フィルムを基材層とし、
基材層の裏面側に印刷層を形成し、
さらに印刷層の裏面側からアンカーコート層(以下、AC層と記す。)を介して押出ラミネート法による容器本体の周壁に直接熱融着可能な合成樹脂製の接着層を積層し、
基材層と印刷層と接着層を積層して接着層が冷却固化した状態で、エンボス加工により接着層の裏面側に凹部を形成する、と云うものである。
容器本体の周壁に直接熱融着可能な合成樹脂製フィルムを接着層とし、
接着層の表面側に印刷層を積層し、
さらにAC層を介して押出ラミネート法による合成樹脂製の保護層を積層し、
接着層と印刷層と保護層を積層して保護層が冷却固化した状態でエンボス加工により接着層の裏面側に凹部を形成する、と云うものである。
インモールド成形法でラベルを貼着した合成樹脂製容器において、
容器本体の周壁は3次元曲面状に形成された3次元曲面領域を有し、
ラベルには前述した本発明のインモールド成形用ラベルを使用し、
ラベルが容器本体の周壁の3次元曲面領域を含む領域に貼着されており、貼着領域の全領域に亘って周壁の形状に沿って密着状に貼着されている構成とする、と云うものである。
すなわち、本発明のインモールド成形用ラベルは容器本体の周壁に接着する接着層の裏面側にエンボス加工により規則的なパターンで凹部を配設し、これら凹部の深さ、個数、総体積を所定の適宜の範囲にすることにより、
ラベルに3次元曲面に沿って変形可能な追従性を付与することができ、
凹部による空気の逃げ道としての機能及び逃がしきれなかった空気を吸収する機能が十分に発揮されることと相俟って、3次元曲面領域でのエア溜まりや皺の発生を効果的に抑制することができ、
容器本体の周壁の3次元曲面領域でエア溜りや皺のない状態で高品位に貼着することができる。
図1~4は本発明のラベル付き容器の一実施例を示すもので、図1は側面方向からみた斜視図、図2は正面図、図3は側面図、図4(a)は平面図、(b)は図2中のA-A線に沿って示す平断面図、(c)は底面図である。
また、図5はこのラベル付き容器に使用される、本発明のインモールド成形用ラベルの実施例1の層構成を示す断面図、図6は図5のラベルの裏面側からみた凹部19の配設パターンを示す平面図である。
図1のラベル付き容器は、容器本体1の周壁に図5、6に示すラベル11をインモールド成形法により容器の表面、裏面の両面に貼着したものである。
また、容器本体1の胴部4は全体として楕円筒状であるが、上端部から下端部にかけて緩やかに縮径した形状で、その周壁は周方向と共に縦方向についても湾曲状であり、胴部4の外周面は略全範囲に亘って3次元曲面状の3次元曲面領域となっている。
そして、ラベル11はこの容器本体1の胴部4の正面側の上端部から下端部にかけての3次元曲面領域を含む広い範囲に、3次元曲面に沿って密着状に貼着しており、全領域に亘ってエア溜りや皺や剥がれのない状態で高品位に貼着している。
ここで、基材層12は透明なCPPフィルム製で層厚は0.070mm、そして接着層16は低密度ポリエチレン(LDPE)樹脂を押出ラミネート法により積層したもので、後述するエンボス加工前の層厚が0.010mmであり、ラベル11全体の平均厚さは0.085mmである。
1)透明なCPPフィルムの裏面側に印刷層13を印刷する。
2)印刷層13の裏面側からアンカーコート剤を塗布、乾燥してAC層14を積層する。
3)さらに押出ラミネート法によりLDPE樹脂を積層し、接着層16とする。
4)接着層16を冷却ロールで冷却固化させた後、接着層16の裏面側からエンボスパターンを有するエンボスロールでエンボス加工を行う。
5)スリット後、所定のラベル形状に打ち抜き加工を行なう。
なお、図5に示す実施例1のラベル11では、ラベル11の総厚さが0.085mm、接着層16の層厚さは0.010mm、そして凹部19の深さdの平均値が0.060mmであり、エンボス加工の影響は接着層16だけでなく、ラベル11の厚さ全体に及び、ラベル11全体が厚さ方向に凹凸構造を有するものとなっている。
また、LDPE樹脂を押出ラミネート法により積層した接着層16は、インモールド成形において、HDPE樹脂製の容器本体1の周壁に直接熱融着する。
また、印刷層13はグラビア印刷、スクリーン印刷、フレキソ印刷等、さまざまな印刷法により形成することができる。
またアンカーコート剤としては、例えばポリエチレンイミン、ポリエーテルポリオール・ポリイソシアネート、ポリエステルポリオール・ポリイソシアネート等を水や有機溶剤で希釈したものを使用することができる。
そして凹部19の配設態様の指標となる数値は以下のようである。
・凹部19の深さdの平均値は0.060mm
・ラベル11の全表面積に対する凹部19の総面積の割合(以降、面積比Atrとする。)は46%
・ラベル11の表面積1cm2あたりの凹部19の配設個数(以降、個数Ntとする。)は324ケ/cm2
・ラベル11の表面積1cm2あたり総体積(以降、総体積Vtとする。)は0.002cm3/cm2
また、容器本体1の周壁に貼着した後の凹部19の深さdの平均値は、ラベルが貼着した部分で断面をスライスして顕微鏡で拡大観察した結果、0.030mmであった。
G=E*t3 (1)
但し、E、tは、それぞれ次のようである。
E;ラベルの引張弾性率(MPa)
t;ラベル厚さ(mm)
なお、上記ラベルの厚さtは図5に示すように、エンボス加工による凹部19が形成されていない部分での厚さを使用する。
また、引張弾性率はラベルをASTM-1822Lのダンベル形状に打ち抜き、1mm/分の引張速度で引張り試験を実施して求めた。
ここで、ラベルの縦方向は、容器本体に貼着した際の容器本体の軸方向に相当し、横方向はそれに直角な方向に相当する。
ラベル11は、予め型面に減圧吸気路24により吸着されるが、3次元曲面領域に該当する箇所は型面とは必ずしも接触せず、一部浮いた状態となっている。
この状態で、ブローエアを吹き込むとパリソン22は膨張し(図10中の矢印方向参照)キャビティの形状に沿って順次、賦形されるが(図10中の2点鎖線の状態参照)、ラベル11は胴部4の周壁に一体化された状態に貼着される。
この際、特に、図1に示すようにラベル11を容器本体1の胴部4の周壁の3次元曲面領域を有する外周面に貼着する場合には、平面形状のラベル11がこの3次元曲面に沿って変形しながら接着が進行するため、2次元曲面に貼着する場合に比較してエア溜りや、皺や、剥がれが発生し易いが、
上記のように、凹部19の深さd、面積比Atr、個数Nt、総体積Vtを所定の範囲とすることにより、ラベル11の厚さ方向全体の凹凸構造による蛇腹効果が発揮されること、また高温のパリソンの接触によるラベル11の収縮挙動を緩和することができることの作用効果も相俟って3次元曲面に沿って変形可能な追従性が付与され、
さらに凹部19によりインモールド成形時における空気の逃げ道としての機能が十分に発揮され、エア溜りや、皺や、剥がれの発生を効果的に抑制することができる。
接着層16はCPPフィルム製で層厚は0.070mm、そして保護層17はLDPE樹脂を押出ラミネート法により積層したもので層厚が0.010mmであり、ラベル11全体の平均厚さは0.085mmで、図5にある実施例1のラベル11の層構成を上下逆にしたような層構成となっている。
なお上記構成で接着層16は基材層12としての機能も発揮するものである。
1)容器本体1の壁面と直接熱融着可能なCPPフィルムを接着層16とし、この接着層16の表面側に印刷層13を印刷する。
2)さらにアンカーコート剤を塗布、乾燥してAC層14を積層する。
3)さらに表面側に押出ラミネート法によりLDPE樹脂を積層し、印刷層13の傷付き等を防止する保護層17とする。
4)保護層17を冷却ロールで冷却固化させた後、接着層16の裏面側に、エンボスパターンを有するエンボスロールでエンボス加工を行う。
5)スリット加工後、所定のラベル形状に打ち抜き加工を行なう。
なお、図7に示す実施例2のラベル11においてもエンボス加工の影響は接着層16だけでなく、ラベル11の厚さ全体に及び、ラベル11の厚さ方向全体に凹凸構造を有するものとなっている。
また、図12の表2は図11の表1に示されるL1、L2、Lc1、Lc2、Lc3、Lc4の6種のラベルを使用し、図10に示されるインモールド成形法で、HDPE樹脂、あるいはPP樹脂で、図1に示されるラベル付き容器の金型を用いて成形した、6種のラベル付き容器について、皺やエア溜りの有無を観察した結果、さらに成形後の凹部19の深さを測定した結果をまとめた表である。
なお、実施例1(B1とする。)では図5に示される構成ラベルを使用し、実施例2(B2とする。)では図7に示される構成のラベルを使用した。
また、比較例1、2、3、4(Bc1、Bc2、Bc3、Bc4とする。)では図11に示される、Lc1、Lc2、Lc3、Lc4のラベルを使用した。
このLc1のラベル11は図11の表1に示されるようにL1のラベルと同様な層構成を有し、凹部19の配設パターンも図6に示されるパターンと同様にしているが、押出ラミネート法によりLDPE樹脂を積層して形成された接着層16を、エンボスパターンを有する冷却ロールで冷却固化すると同時にエンボス加工を行ったものであり、エンボス加工による凹部19の形成領域は厚さが0.020mmの接着層16に留まり、配設態様の指標となる数値をみると、その深さdは0.015mm程度であり、面積比Atrや個数NtはL1、L2のラベルと同様であるが、総体積Vtは小さな値に留まっている。
またLc3のラベルは、CPPフィルム製の基材層にドライラミネート層(DL層)を介して予め裏面側をエンボス加工した共重合PP樹脂製フィルム(Co-PPフィルム)からなる接着層をドライラミネート法により積層した層構成を有し、図9に示したのと略同様な配設パターンとしたものである。
そして、Lc2、Lc3のラベルもエンボス加工による凹部19の形成領域は接着層16に留まり、その深さは0.010~0.015mm程度である。
また、Lc4のラベルは、層構成や凹部19の配設態様の指標となる深さd、面積比Atr、個数Nt、総体積Vtの値をL1のラベルと同様にし、基材層12と接着層16の層厚を厚くし、ラベル11全体の平均厚さを0.105mmとしたものである。
また、成形後の凹部19の深さdを測定した結果をみると、B1とB2のラベル付き容器では0.030mm、0.040mmであるのに対し、
比較例のBc1、Bc2、Bc3の容器では測定限界以下の0.010mm未満で、インモールド成形の工程でほとんど凹部19が消失しており、インモールド成形時における凹部19の空気の逃げ道としての機能や、3次元曲面に沿った変形を可能とする追従性が小さく、皺やエア溜りの発生を抑制する機能が不足したものと推察される。
所定の範囲の深さを有する凹部を規則的なパターンで配設し、さらにこれら凹部の個数Nt、総体積Vtを所定の適宜の範囲にする必要があることが分かる。
従って、実際にラベルを実用化する際には、層構成や前述したように凹部19の配設態様を適宜決めた後に、さらにG値を指標としてラベル全体の腰強さを適宜の大きさにしておくことが好ましい。
たとえば、上記実施例では、容器本体をダイレクトブロー成形によるものとしたが、2軸延伸ブロー成形、熱成形によるものとすることもできる。
また、ラベルの層構成は実施例1、2に示した他にも、容器本体に使用する合成樹脂との組み合わせも考慮しながら、様々な層構成のバリエーションの中から適宜選択できるものである。
また、凹部の規則的な配設パターンについても、図6、9に示したパターンの他にも様々なバリエーションの中から適宜選択できるものである。
2 ;口筒部
3 ;肩部
4 ;胴部
5 ;底部
11;ラベル
12;基材層
13;印刷層
14;アンカーコート層
16;接着層
17;保護層
19;凹部
19f;平坦部
21;ダイス
22;パリソン
23;ブロー割型
24;減圧吸気路
d ;(凹部の)深さ
t ;(ラベルの)厚さ
Claims (8)
- インサート材として使用され合成樹脂製の容器本体の成形と同時に該容器本体の周壁に貼着されるインモールド成形用ラベルであって、前記容器本体の周壁に接着する接着層(16)を有し、前記接着層(16)は、裏面側にエンボス加工による凹部(19)が規則的なパターンで配設されたものであり、前記凹部(19)の平均深さを0.02~0.1mmの範囲とし、ラベルの表面積1cm2あたりの凹部(19)の平均個数を25~2500ケの範囲とし、ラベルの表面積1cm2あたりの凹部(19)の空間体積の総和を0.001~0.005cm3の範囲としたことを特徴とするインモールド成形用ラベル。
- 下記式(1)で算出されるG値が、0.05~0.20の範囲であるラベル(11)を使用した請求項1記載のインモールド成形用ラベル。
G=E*t3 (1)
但し、E、tは、それぞれ次のようである。
E;ラベルの引張弾性率(MPa)
t;ラベル厚さ(mm) - ラベルの全表面積に対する凹部(19)の面積の割合を10~70%の範囲とした請求項1または2記載のインモールド成形用ラベル。
- エンボス加工による凹部(19)により、厚さ方向全体に亘って凹凸構造を有する請求項1、2または3記載のインモールド成形用ラベル。
- 透明性を有する合成樹脂製フィルムを基材層(12)とし、該基材層(12)の裏面側に印刷層(13)を形成し、さらに前記印刷層(13)の裏面側からアンカーコート層(14)を介して押出ラミネート法よる容器本体の周壁に直接熱融着可能な合成樹脂製の接着層(16)を積層し、前記、基材層(12)と印刷層(13)と接着層(16)を積層して該接着層(16)が冷却固化した状態でエンボス加工により前記接着層(16)の裏面側に凹部(19)を形成した請求項1、2、3または4記載のインモールド成形用ラベル。
- 容器本体の周壁に直接熱融着可能な合成樹脂製フィルムを接着層(16)とし、該接着層(16)の表面側に印刷層(13)を積層し、さらにアンカーコート層(14)を介して押出ラミネート法による合成樹脂製の保護層(17)を積層し、前記接着層(16)と印刷層(13)と保護層(17)を積層して該保護層(17)が冷却固化した状態でエンボス加工により前記接着層(16)の裏面側に凹部(19)を形成した請求項1、2、3または4記載のインモールド成形用ラベル。
- インモールド成形法でラベルを貼着した合成樹脂製容器において、容器本体(1)の周壁は3次元曲面状に形成された3次元曲面領域を有し、ラベル(11)には請求項1、2、3、4、5または6の何れかに記載されるインモールド成形用ラベルを使用し、前記ラベル(11)が前記容器本体(1)の周壁の3次元曲面領域を含む領域に貼着されており、貼着領域の全領域に亘って前記周壁の形状に沿って密着状に貼着されていることを特徴とするラベル付き容器。
- 成形後の、ラベル(11)の凹部の平均深さが0.01~0.08mmの範囲である請求項7記載のラベル付き容器。
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JP2017013300A (ja) * | 2015-06-30 | 2017-01-19 | 株式会社フジシール | ラベル付き成形体の製造方法、及びラベル付き成形体 |
JP2019040196A (ja) * | 2018-10-22 | 2019-03-14 | 株式会社吉野工業所 | インモールド成形用ラベル及びラベル付き容器 |
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EP2843647B1 (en) | 2020-05-06 |
TWI613061B (zh) | 2018-02-01 |
CA2871412C (en) | 2019-05-21 |
EP2843647A4 (en) | 2016-02-10 |
US10019914B2 (en) | 2018-07-10 |
US20150083630A1 (en) | 2015-03-26 |
JP6103343B2 (ja) | 2017-03-29 |
CN104303220A (zh) | 2015-01-21 |
JP2013242513A (ja) | 2013-12-05 |
CA2871412A1 (en) | 2013-10-31 |
EP2843647A1 (en) | 2015-03-04 |
AU2013253981A1 (en) | 2014-11-13 |
KR102064818B1 (ko) | 2020-01-10 |
TW201410440A (zh) | 2014-03-16 |
KR20150013478A (ko) | 2015-02-05 |
CN104303220B (zh) | 2018-06-29 |
AU2013253981B2 (en) | 2016-05-26 |
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