JP2011158554A - Heat shrink tubular label, manufacturing method thereof, and plastic bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat shrink tubular label improved so as to be safely used even if a state such as falling occurs, and so as to achieve easy opening performance. <P>SOLUTION: The heat shrink tubular label has a heat shrink base film 1 having a right end and a left end. The right end and the left end are superposed so that the heat shrink base film 1 forms a tube. A superposition part 2 is fused with a sealing solvent. A pair of first perforations 3 are continuously formed in a vertical direction of the heat shrink base film 1. A pair of second perforations 4a, 4b are partly formed at an upper end side and/or a lower end side so as to sandwich the first perforations 3 from both sides along the pair of the first perforations. In the pair of the second perforations 4a, 4b, one perforation and the other perforation are formed to alternately advance like a foot step in a slot. Either of one perforation and the other perforation comes to an upper end and/or a lower end of the heat shrink base film. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates generally to heat-shrinkable tubular labels, and more particularly to heat-shrinkable tubular labels with improved perforation ease. The invention also relates to a method for producing such a heat-shrinkable tubular label. The present invention further relates to a plastic bottle in which such a heat-shrinkable tubular label is mounted on the outer periphery of the body.

  In general, PET bottles filled with beverages and the like that have been used in the past are collected after being used. For this purpose, it is necessary to first peel off and separate the printed label (heat-shrinkable tubular label). is there. In order to easily perform the separation and separation, these labels are generally provided with one or two perforations over the entire length from the upper end to the lower end thereof.

  By the way, although the cost reduction of a PET bottle and a printed label has been conventionally considered, this has been started in earnest recently. There are various means for reducing the cost, and one of them is to reduce the amount of material resin used. This is to reduce the amount of material used by reducing the amount of material used in a lighter PET bottle than in the past, and also by making the printed label thinner.

  However, the reduction of the amount of the material resin eventually reduces the thickness, which causes a problem of strength reduction. In particular, when a beverage or the like is filled and then accidentally dropped during handling, a problem arises in that the perforation, particularly the central portion of the printed label that is fitted, is damaged by impact. This damage is also affected by the type of material resin of the printed label, and the cause is as follows. In other words, if the impact at the time of dropping is the central part of the bottle, that is, a polygonal circular bottle, the polygonal plane (panel surface) forming the central part of the body is inflated instantaneously, and the center of the perforation by the swelling force It is to say that the part is cut. This problem can be solved by forming the perforation at a rough pitch, but this time, there arises a problem that the easy-openability cannot be obtained.

  In Patent Literature 1, easy opening is ensured in olefin-based and styrene-based heat-shrinkable films by making a cut in the upper and lower portions of the label. However, polyester-based heat-shrinkable films or polyester-based resins and polystyrene-based materials are secured. There was a problem that sufficient openability could not be realized in a multilayer heat-shrinkable film formed from a resin. Further, in the conventional continuous perforation, it is not easy to grasp the trigger of opening in a polyester heat-shrinkable film or a multilayer heat-shrinkable film formed from a polyester resin and a polystyrene resin.

JP 2000-10758 A

  The present invention has been made to solve the above-described problems, and with the reduction in weight of a PET bottle, the risk of breakage of the newly generated perforation central portion is eliminated, and a situation such as a fall occurs. However, it was made for the purpose of developing printed labels for lightweight PET bottles that can be used with peace of mind.

  That is, an object of the present invention is to provide an improved heat-shrinkable tubular label that can be used with peace of mind even when a situation such as dropping occurs, and can be easily opened.

  Another object of the present invention is to improve heat shrinkage so as to ensure sufficient easy opening in a polyester heat shrinkable film or a multilayer heat shrinkable film formed from a polyester resin and a polystyrene resin. It is in providing a sex tubular label.

  Still another object of the present invention is to provide a plastic bottle having such a heat-shrinkable tubular label attached to the outer periphery of the body.

  Another object of the present invention is to provide a method for producing such a heat-shrinkable tubular label.

  The present invention is a heat-shrinkable tubular label attached to a side surface of a plastic container, and includes a heat-shrinkable base film having a left end and a right end. The left end and the right end are overlapped and sealed so that the heat-shrinkable base film forms a tube. A pair of first perforations are continuously formed in the vertical direction of the heat-shrinkable base film. A pair of second perforations are partially formed on the upper end side and / or the lower end side so as to sandwich the pair of first perforations from both sides, or to be sandwiched by both sides from the both sides. Is formed. In the pair of second perforations, one perforation and the other perforation are formed so as to alternately proceed in a foot step shape, and either one of the one perforation or the other perforation is subjected to heat shrinkage. The upper end and / or the lower end of the conductive base film is approached.

  The pair of first perforations may be provided so as to sandwich the overlapping portion.

  One perforation and the other perforation of the pair of second perforations (foot-step perforations) are preferably formed of rectangular or variously shaped holes.

  The pair of first perforations (continuous perforations) formed continuously are formed with a rough pitch that cannot be easily opened unless the second perforation (footstep perforation) is provided. Preferably it is done. As a result, even if the central portion of the bottle swells due to an impact at the time of falling, the force does not break at the central portion of the first perforation (continuous perforation). Further, in the pair of second perforations (foot-step perforations), one perforation and the other perforation are formed so as to alternately advance in a foot-step shape through a rectangular hole. Since either the eye or the other perforation is approaching the upper end and / or the lower end of the heat-shrinkable base film, the cut is given at this portion.

  The pair of second perforations (foot-step perforations) is formed by laser processing, and the pair of first perforations (continuous perforations) is formed by a sewing blade or a sewing needle.

  The perforation size and the like will be described in more detail. Referring to FIG. 1, in the first perforation (continuous perforation), the hole diameter (a) is preferably 0.2 to 0.7 mm, and the gap (b) is 1.5 to 3.5 mm. preferable. In the second perforation (laser), the hole diameter (c) is preferably 0.2 to 1.0 mm, and the gap (d) is preferably larger than 0 and smaller than the hole diameter (c). The upper and lower intervals (e) of the pair of second perforations (lasers) proceeding in a footstep shape are preferably 10 to 50 mm.

The heat-shrinkable base film is formed of a polyester heat-shrinkable film or a multilayer heat-shrinkable film formed from a polyester resin and a polystyrene resin.
Specifically, as a polyester heat-shrinkable film, Toyobo Co., Ltd. Space Clean S7042, a multilayer heat-shrinkable film formed from a polyester resin and a polystyrene resin, specifically Gunze Co., Ltd. An example is a fancy wrap HGT type.

  A plastic bottle according to another aspect of the present invention is formed by fitting the above-described heat-shrinkable tubular label to the outer periphery of the body portion.

The method according to the other aspect of this invention concerns the manufacturing method of the heat-shrinkable tubular label with which the side of a plastic container equipped with the process of following 1) -4).
1) A step of preparing a long heat-shrinkable base film having a left end and a right end.
2) A step of continuously forming a pair of first perforations in the longitudinal direction of the heat-shrinkable base film.
3) When the heat-shrinkable tubular label is attached to the side surface of the plastic container, the pair of second perforations advances alternately in a foot step shape to the upper end side and / or lower end side thereof. Forming.
4) A step of overlapping and sealing the left end portion and the right end portion so that the heat-shrinkable base film forms a tube.

  According to the present invention, even if the central portion of the bottle swells due to an impact at the time of dropping, it does not break at the central portion of the first perforation (continuous perforation) due to the force. Further, in the pair of second perforations (footstep perforations), one perforation and the other perforation are formed so as to advance alternately in a footstep shape through a rectangular or elliptical hole, Since either one perforation or the other perforation is approaching the upper end and / or the lower end of the heat-shrinkable base film, the cut perforation is given at this portion, which is the first perforation. Propagated to (continuous perforations), cut across its entire length from its upper end to its lower end, and the label is separated from the bottle.

It is a figure for demonstrating the preferable pitch of a perforation. It is the perspective view and partial enlarged view of the heat-shrinkable tubular label concerning Example 1. FIG. 1 is a perspective view of a PET bottle equipped with a heat-shrinkable tubular label according to Example 1. FIG. It is a figure explaining operation | movement of the heat-shrinkable tubular label concerning Example 1. FIG. It is a figure which shows the method of measuring the peeling resistance value of a perforation. It is a conceptual diagram of the manufacturing apparatus of the heat-shrinkable label which concerns on Example 2. FIG. It is a figure which shows the manufacturing process of a heat-shrinkable tubular label.

  Combining conventional perforation and laser perforation for the purpose of obtaining a heat-shrinkable tubular label that can be used with peace of mind in the event of a fall, etc. and can be easily opened Realized by that. By forming the perforation processing by the laser so as to alternately proceed in a foot step shape, a trigger for the cut is given.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 2 is a perspective view and a partially enlarged view of a heat-shrinkable tubular label according to the present invention.

  Referring to these drawings, the heat-shrinkable tubular label includes a heat-shrinkable base film 1 having a left end and a right end, and the heat-shrinkable base film 1 forms a tube at the left end and the right end. It is superimposed so that it does. The overlapping portion 2 is fused with a seal solvent. In the drawing, the fused portion is represented by oblique lines. A pair of first perforations 3 are continuously formed in the vertical direction of the heat-shrinkable base film 1 so as to sandwich the overlapping portion 2. A pair of second perforations (foot-step perforations) 4a and 4b are partially formed on the upper end side and / or the lower end side so as to sandwich the pair of first perforations 3 from both sides. Is formed. The pair of first perforations (continuous perforations) 3 are formed with a rough pitch that does not allow easy opening without the second perforations (foot-step perforations) 4a and 4b. In the pair of second perforations (foot-step perforations) 4a and 4b, one perforation and the other perforation are formed so as to alternately advance in a foot-step shape through a rectangular hole. Either the eye or the other perforation is approaching the upper end and / or the lower end of the heat-shrinkable base film 1.

  The pair of second perforations (foot-step perforations) 4a and 4b are formed intermittently by laser processing, and the pair of first perforations (continuous perforations) 3 are formed by a sewing blade or a sewing needle. Has been. The heat-shrinkable base film 1 is formed of a polyester heat-shrinkable film or a multilayer heat-shrinkable film formed from a polyester-based resin and a polystyrene-based resin.

  FIG. 3 is a perspective view of a PET bottle equipped with the heat-shrinkable tubular label according to the example. It is formed by mounting the heat-shrinkable tubular label 1 on the body of a container such as a PET bottle 5 and shrinking the mounted container through a shrink tunnel. Filling the container with the contents may be performed before the heat-shrinkable label is attached to the container, or may be performed after shrinking through the shrink tunnel.

  FIG. 4 is a diagram for explaining the operation of the heat-shrinkable tubular label according to the example. According to this embodiment, the first perforation (continuous perforation) 3 has a rough pitch that cannot be easily opened without the second perforations (foot-step perforations) 4a and 4b. Since it is formed, even if the central portion of the bottle swells due to an impact at the time of dropping, it does not break at the central portion of the first perforation (continuous perforation) due to the force. On the other hand, in the pair of second perforations (foot-step perforations) 4a and 4b, one perforation and the other perforation are formed so as to advance alternately in a foot-step shape through a rectangular hole. Since either one of the perforation and the other perforation is approaching the upper end and / or the lower end of the heat-shrinkable base film 1, the cut is given at this portion, and the finger 6 peels off the figure. In this way, the force propagates to the first perforation (continuous perforation) 3 and cuts over the entire length from the upper end to the lower end, and the label is peeled off from the bottle and separated.

The results obtained by comparing the peel resistance values with and without the second perforation will be described. Cut a perforated Gunze hybrid styrene HGT type 40μm label (folding diameter 114mm) at a pitch of 176mm, put it on a 500ml PET bottle (bamboo-shaped round shape) and immerse it in 95 ° C warm water for 7 seconds to obtain a sample for evaluation It was. Next, referring to FIG. 5 (A), a 5 mm wide L-shaped metal fitting is inserted between the perforated portion on the label and the bottle, and the L-shaped metal fitting is oriented in a 90 ° direction with respect to the horizontal bottle after connecting to the tensile tester. Tensile strength (500 mm / min) and the peel resistance when the perforation was cut were measured. Next, referring to FIG. 5 (B), the cut perforation (label) middle part end is fixed to the holding metal fitting of the tensile tester, pulled in the 90 ° direction (500 mm / min), and perforated (label) The peel resistance value when cutting was measured. The results are shown in Table 1. In Table 1, the lower the tear resistance value, the higher the ease of opening.

  The manufacturing method of the heat-shrinkable tubular label concerning an Example is demonstrated. FIG. 6 is a conceptual diagram of a manufacturing apparatus, and FIG. 7 is a diagram showing a manufacturing process of a heat-shrinkable tubular label. 6 and 7, a long heat-shrinkable substrate film (printed) 11 unwound from the unwinding shaft 12 passes through several guide rollers 14 and a nip roller 15 in the direction of arrow a. To the winding shaft 13. In the process, second perforations (foot-step perforations) 4a, 4b and first perforations (continuous perforations) 3 are applied (FIG. 7A). The second perforation (footstep perforation) 4a, 4b is processed by detecting the presence or absence of a print pattern on the film by the fiber sensor 21, taking the timing as a trigger into the laser controller 18, and by the pulse generator 22. While measuring the length, the laser head 19 partially oscillates the laser to process the second perforations 4a and 4b on the film.

  Further, the size and interval of the patterns of the second perforations (foot-step perforations) 4a and 4b are determined by the operation panel 20 according to the container to be mounted. One perforation 4a and the other perforation 4b are formed in a rectangular hole so as to proceed alternately in a foot step shape. Next, the first perforation (continuous perforation) 3 is continuously formed on both sides of the second perforation (foot-step perforation) 4a, 4b by the perforation needle / perforation blade 17 (FIG. 7 (A)).

  Next, the sealing solvent 16a is applied to one end of the heat-shrinkable substrate film by the application nozzle 16 (FIG. 7A). The nip roller 15 is formed so that the heat-shrinkable substrate film 11 forms a tube. One end portion 11a and the other end portion 11b are overlapped and sealed (adhered) (FIG. 7B), which is a heat-shrinkable base material wound onto the winding shaft 13. It is a perspective view of the sleeve of the film 11. With reference to FIG.7 (D), the sleeve of a heat-shrinkable base film is set to the label mounting machine which is not shown in figure, and it pulls out, and forms the tube shape of every sheet Cut into individual pieces of the heat-shrinkable tubular label 1. At this time, one perforation 4a and the other perforation 4b of the second perforation (footstep-like perforation) are rectangularly shaped in a footstep shape. It is formed to advance alternately Thus, no matter which part is cut, one of the perforations 4a and the other perforation 4b reaches the upper end and / or the lower end of the heat-shrinkable tubular label 1. The size and interval of the perforations 4a and 4b of the second perforation (footstep perforation) are set by the panel 10 according to the container.

  When the cut heat-shrinkable tubular label 1 is attached to the body of a container such as a plastic bottle, passed through a shrink tunnel and shrunk to adhere to the container, a container having the heat-shrinkable tubular label adhered thereto is obtained. It ’s done. Filling the container with the contents may be performed before the heat-shrinkable label is attached to the container, or may be performed after shrinking through the shrink tunnel.

  In the above-described embodiment, the case where the pair of first perforations (continuous perforations) is provided so as to sandwich the overlapping portion from the relationship of the print pattern is illustrated. Also good.

  In the above embodiment, the case where one perforation and the other perforation of the second perforation (footstep perforation) are formed by rectangular holes is illustrated, but the present invention is not limited to this. Various shapes such as an elliptical shape, a rounded rectangular shape, and a square shape are conceivable.

  In the above embodiment, the case where a pair of second perforations are formed so as to sandwich them from both sides along the first perforations is illustrated. The first perforation may be formed so as to be sandwiched from both sides.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  According to the present invention, it is possible to obtain a heat-shrinkable tubular label that can be used with peace of mind and can be easily opened even if a situation such as dropping occurs.

DESCRIPTION OF SYMBOLS 1 Heat-shrinkable tubular label 2 Superposition part 3 1st perforation 4a, 4b 2nd perforation 5 PET bottle 11 Heat-shrinkable base film (printed)
12 unwinding shaft 13 winding shaft 14 guide roller 15 nip roller 16 application nozzle 16a sealing solvent 17 sewing needle / sewing blade 18 laser controller 19 laser head 20 operation panel 21 fiber sensor 22 pulse generator (encoder)

Claims (8)

A heat-shrinkable tubular label attached to the side of a plastic container,
A heat-shrinkable base film having a left end and a right end;
The left end and the right end are overlapped and sealed so that the heat-shrinkable base film forms a tube,
A pair of first perforations are continuously formed in the vertical direction of the heat-shrinkable base film,
A pair of second perforations are partially formed on the upper end side and / or the lower end side so as to sandwich them from both sides along the pair of first perforations or from both sides. Formed,
In the pair of second perforations, one perforation and the other perforation are formed so as to alternately proceed in a foot step shape, and either one of the one perforation or the other perforation is subjected to heat shrinkage. The heat-shrinkable tubular label which has reached the upper end and / or the lower end of an expandable base film.   The heat-shrinkable tubular label according to claim 1, wherein the pair of first perforations are provided so as to sandwich the overlapping portion.   The heat-shrinkable tubular label according to claim 1 or 2, wherein the one perforation and the other perforation are formed of rectangular or variously shaped holes.   The heat-shrinkable base film according to any one of claims 1 to 3, wherein the heat-shrinkable base film is a film formed of a polyester-based resin or a multilayer film formed of a polyester-based resin and a styrene-based resin. Tubular label.   The heat-shrinkability according to any one of claims 1 to 4, wherein the pair of first perforations are formed at a rough pitch that does not allow easy opening without the second perforations. Tubular label.   A plastic bottle in which the heat-shrinkable tubular label according to any one of claims 1 to 5 is fitted to the outer periphery of the body portion. A method for producing a heat-shrinkable tubular label attached to a side surface of a plastic container, comprising the following steps 1) to 4).
1) A step of preparing a long heat-shrinkable base film having a left end and a right end.
2) A step of continuously forming a pair of first perforations in the longitudinal direction of the heat-shrinkable base film.
3) When the heat-shrinkable tubular label is attached to the side surface of the plastic container, the pair of second perforations advances alternately in a foot step shape to the upper end side and / or lower end side thereof. Forming.
4) A step of overlapping and sealing the left end portion and the right end portion so that the heat-shrinkable base film forms a tube.   The method for producing a heat-shrinkable tubular label according to claim 7, wherein the pair of second perforations are formed by laser processing, and the pair of first perforations are formed by a sewing blade or a sewing needle.

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