JP5595205B2 - Manufacturing method of shrink package - Google Patents

Description

  The present invention relates to a method for manufacturing a shrink package, in which a shrink film is closely arranged on the surface of an object to be packaged by heat shrinkage.

  2. Description of the Related Art Conventionally, shrink packaging is generally known in which a shrink film is heated in a state in which the package object is stored in a shrink film bag body so that the shrink film is brought into close contact with the surface of the package object. This shrink wrapping is performed for the purpose of preventing dirt on products, guaranteeing virginity, preventing tampering, etc., especially in the case of products with caps connected to the main body, such as aerosol products, preventing the cap from falling off the main body. It performs an important function.

  For example, when shrink-wrapping a column-shaped packaged object in which one end of an aerosol product or the like is formed in an arc shape, the packaged object is arranged along the axial direction of the shrink film in a continuous shrink film. In this state, the shrink film is melt-cut in a direction perpendicular to the axial direction of the shrink film and linearly on both sides of the package. Thereby, both ends of the shrink film are melted and heat-sealed at both end sides of the package object, and the package object is placed in the rectangular bag-shaped shrink film. And by applying heat from the outside to the shrink film in which the article to be packaged is arranged in this way, the shrink film is thermally contracted and brought into close contact with the surface of the article to be packaged to form a shrink package.

  However, when the column-shaped packaged object having one end formed in an arc shape as described above is shrink-wrapped, a pair of corners are formed on both sides and the other end of the arc-shaped end of the shrink package. That is, by melting and cutting the cylindrical shrink film as described above, the melt-cut portions are positioned on the arc-shaped one end surface and the other end surface of the package by heat shrinkage, and both ends of the melt-cut portions are packaged. It protrudes outward from the arc-shaped one end surface and the other end surface of the object, respectively, and forms a pair of corner portions. For this reason, when shrink-wrapped products are displayed at the storefront, it is safe because a person who tries to pick up the product may injure his / her fingers due to the corner formed on one end surface located on the front end side of the packaged item. In addition to the problem of the property, the formation of the corners causes the prominent irregularities to be formed on the front end side of the product, which has an adverse effect on the appearance of the product.

  In addition, although a pair of corner | angular part is formed also in the bottom face which is the other end surface side of a shrink wrapping body, these corner | angular parts are hidden in the other end surface of a packaged article when a shrink wrapping body is displayed in a shop front. is there. Therefore, there is little risk of damaging the fingers with the corners on the other end side when reaching out to the displayed shrink wrapping body, and there is no risk of inconvenience in appearance due to the corners on the other end side. It will not be.

  Therefore, as a method of closely arranging the entire shrink film on the surface of the packaged object without forming a corner on one end side of the arc shape of the shrink package as described above, a manufacturing method of the shrink package as shown in Patent Document 1 is provided. It is publicly known. That is, as described above, the melt cutting generally performed conventionally is to melt and cut the shrink film in a straight line, but in the invention described in Patent Document 1, the front end side of the packaged object is used. A shrink film on one end side is cut by curving both ends of the melt-cut portion toward the package object side. By curving both ends of the melt-cut portion in this way, when shrinking by applying heat to the shrink film, the shrink film is packaged without forming a corner on one end of the package. It is intended to be brought into close contact with the shape of one end side of the object.

JP-A-6-270954

  However, in the invention described in Patent Document 1, it is necessary to bend both ends of the melt-cut portion as described above. Therefore, it is necessary to prepare a special heat cutter for bending and melting the both ends. Therefore, since a heat cutter that can be melted and cut in a straight line that is generally used conventionally cannot be used, a dedicated heat cutter is required, and the cost is high. In addition, since both ends of the melt-cut part are bent and cut to the side of the package, when the heat cutter is melt-cut at a position away from the cutting target part, the shrink film is melt-cut at an accurate position. There is a possibility that the melt-cut portion may be displaced without being able to be performed, or the curved portion of the heat cutter may abut against the object to be packaged and damage the object to be packaged.

  Therefore, the present invention is intended to solve the above-described problems, and prevents a situation in which a finger is injured by a corner formed on one end of the arc shape of the package during shrink wrapping, and the appearance of the product. The object of the present invention is to easily and inexpensively carry out a method for manufacturing a shrink-wrapped product that can maintain good quality.

  In order to solve the above-described problems, the present invention covers a packaged article in which one end of a columnar shape is formed in an arc shape in a cylindrical shape in a length direction with a shrink film, and the shrink film is coated on both ends of the packaged article. By melting and cutting, both ends are closed to form a bag, and the bag-shaped shrink film is thermally shrunk to form a shrink package in which the shrink film is closely placed on the package.

  And the temperature of this corner | angular part is the temperature which can carry out plastic deformation of a shrink film at the corner | angular part of a pair of shrink film formed by projecting on both sides of the arc-shaped one end of a shrink packaging body by the heat shrink of the melt cut part of a shrink film. In this state, the pair of rollers disposed on both sides of the shrink wrapping body are pressed and brought into contact with each other, so that the pair of corner portions are plastically deformed and can be crushed.

  Here, it demonstrates below that the temperature of the corner | angular part at the time of the press contact to a roller is the temperature which can be plastically deformed of a shrink film, and is less than melting | fusing point. That is, the melt-cut portion immediately after melt-cutting is at a temperature equal to or higher than the melting point of the shrink film. Therefore, in the environment where the melt cut part or corner part is lower than the melting point of the shrink film by exposing the melt cut part to room temperature atmosphere after the shrink cut of the shrink film until the shrink package reaches the roller. By cooling, the temperature of the corner at the time of pressing contact with the roller can be made lower than the melting point of the shrink film.

  Also, since the melt cut portion of the shrink film reaches the melting point or higher at the time of melt cut, the melt cut portion or corner portion is exposed to room temperature atmosphere after the melt cut of the shrink film until the pressing contact with the roller. By appropriately adjusting the time, treatment temperature for shrinkage of shrink film and treatment time according to the speed of the conveyor and the distance between each process, etc., the temperature of the corner at the time of press contact is plastically deformed. It becomes possible to keep at a possible temperature. When the corner is abutted against the abutting surface, if the corner is crushed by the abutting surface and plastically deformed, the temperature of the corner at the time of pressing contact with the roller can be plastically deformed. It can be said that it was temperature.

  If the corner is pressed against the roller at a temperature lower than the temperature at which the shrink film can be plastically deformed, the corner may not be plastically deformed and the corner may remain at one end of the shrink package. It becomes difficult to reliably crush the part. On the other hand, when the corners are pressed against the roller at a temperature equal to or higher than the melting point of the shrink film, the shrink film is in a molten state, and the melted shrink film adheres to the roller or the packaged object during the press contact, There is a risk that the quality of the package will be lowered due to the opening of holes.

  As described above, the corner is plastically deformed by pressing the roller against the corner in a state where the temperature of the corner is a temperature at which the shrink film can be plastically deformed and kept below the melting point. Will be arranged along the surface of the article to be packaged. Therefore, it becomes possible to suppress the protrusion of the corner formed on both side surfaces of one end of the shrink wrapping body, and a situation occurs in which a finger is injured by the corner portions on both side surfaces of one end of the shrink wrapping body at the time of display. In addition to being difficult, unevenness is not formed on both sides of one end, so that it is possible to maintain a good external appearance impression. In addition, as described above, according to the present invention, the corners can be crushed while transferring the objects to be packaged on the conveyor by a simple method of arranging a pair of rollers on the production line used conventionally. Therefore, there is no need to add a new production line or to move the packaged material on the conveyor to another line, and it is economical and efficient.

In addition, the shrink wrapping body has an arc-shaped one end portion disposed on the rear side in the traveling direction and the other end portion disposed on the front end side and transferred by a conveyor, and a pair of rollers are disposed in the traveling direction. When the pair of rollers arranged on both sides of the conveyor reach the pair of rollers, the pair of rollers is driven and pressed along one end of the arc of the shrink package to transfer the shrink package on the conveyor. However, the corners can be crushed . In this way, by allowing the roller to be pressed along one end of the shrink package, even when corners are formed on both sides of one end of the arc, the corners can be reliably crushed by the rollers. It becomes possible.

  As described above, the present invention keeps the corners of the shrink film formed on both sides of one end of the shrink wrapping body at the time of heat shrinkage at a temperature at which the shrinkage can be plastically deformed and below the melting point. The corners can be plastically deformed and crushed by a simple method of pressing and contacting a pair of rollers in a state of being pressed. For this reason, there is no risk of damaging fingers due to the corners on both sides of one end located at the upper end of the product when the product is held at the display, and at the end that is the leading end of the packaged item at the time of display. Since the shrink film is arranged along one end face of the package without forming the unevenness, the appearance at the time of display can be improved. In addition, as described above, according to the present invention, the corners can be crushed while transferring the objects to be packaged on the conveyor by a simple method of arranging a pair of rollers on the production line used conventionally. Therefore, there is no need to add a new production line or to move the packaged material on the conveyor to another line, and it is economical and efficient.

The top view which shows the production line of Example 1 in this invention. 1 is a plan view showing a bag-shaped film package of Example 1. FIG. 1 is a conceptual diagram showing a shrink package of Example 1. FIG. The top view of the roller drive body which shows the expansion state of a roller main body. AA line end view of FIG. The top view of the roller drive body which shows the contact state of a shrink package and a roller. FIG. 7 is an end view taken along line BB in FIG. 6. The top view of the roller drive body which shows the press contact state to the corner | angular part by a roller. The CC sectional view taken on the line of FIG.

  Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 9. As shown in FIG. 1, (1) is a production line for producing a shrink-wrapped product (2), and the traveling direction indicated by the arrow in FIG. A film wrapping machine (3), a heat cutter (4), a shrink oven (5), and a roller driving body (6) are arranged in series via a conveyor (7). In addition, in manufacture of the shrink package (2) of a present Example, each process other than the heat treatment process by shrink oven (5) is performed in a room temperature atmosphere.

  And the said film packaging machine (3) inserts and arranges the to-be-packaged object (8) sent with the conveyor (7) in the shrink film (10) continuously formed in a cylinder shape. The packaged object (8) of the present example is a cylindrical aerosol container, which is completed with filling of the aerosol contents and connected with a lid (11) whose one end shape is arcuate. Moreover, this packaged article (8) has the lid (11) direction at one end arranged at the rear side and the bottom (12) side at the other end opposite to the arc-shaped one end side in the traveling direction. It is transported in a state.

  The shrink film (10) used in this example is polypropylene (trade name Kojin Polyset, manufactured by Kojin Co., Ltd.). In this embodiment, a polypropylene shrink film (10) is used. However, in other different embodiments, polyethylene, PVC, other polyolefin resin films, etc. are generally used as the shrink film (10). You can use what you have.

  Then, as shown by the dotted line in FIG. 1, the article (8) transferred to the film wrapping machine (3) is inserted into the cylindrical shrink film (10) and placed in the conveyor (7) in this state. To the heat cutter (4). This heat cutter (4) is generally used conventionally and is disposed adjacent to the film packaging machine (3) as shown in FIG. The long cylindrical shrink film (10) can be melted and cut linearly in a direction perpendicular to the axial direction of the shrink film (10).

  And the shrink film (10) of the both ends of a to-be-packaged object (8) is melt-cut at 200 degreeC with the said heat cutter (4). By melting and cutting as described above, the tubular shrink film (10) is cut linearly at both ends of the package (8), and the melt-cut portion (13) is heat-sealed. Therefore, the package (8) is placed in a rectangular bag-shaped shrink film (10) sealed at both ends by heat sealing as shown in FIG.

  Next, the bag-shaped film package (14) in which the packaged article (8) is arranged in the bag-shaped shrink film (10) as described above is transferred into the shrink oven (5) by the conveyor (7). . The atmosphere in the shrink oven (5) is maintained at 160 ° C. to 200 ° C., and the bag-like film package (14) passes through the shrink oven (5) in an average of about 1.8 seconds. The speed of the conveyor (7) is preset. And by allowing the bag-shaped film package (14) to pass through under the above set conditions, the shrink film (10) of the bag-shaped film package (14) receives heat in the shrink oven (5) and shrinks. As shown in FIG. 3, the shrink package (15) is formed in close contact with the surface of the package (8).

Further, when the shrink film (10) receives heat in the shrink oven (5) as described above, the melt-cut portion (13) of the shrink film (10) is thermally shrunk, so that the article to be packaged (8). The melt-cut portion (13) that is thermally contracted is located on one end surface (16) that is the connection side of the lid (11) and the other end surface (17) that is the bottom surface side. Since both ends of the heat-shrinkable melt-cut portion (13) protrude outward from the one end face (16) and the other end face (17) of the package (8), the protruding portions are covered as shown in FIG. A pair of one end side surface (18) of the shrink package (15) located on the one end surface (16) side of the package and the other end surface (20) located on the other end surface (17) side of the package (8). Corners (21) and (22).

  And especially when the corner | angular part (21) is formed in the one end both sides | surfaces (18) of a shrink wrapping body (15), when the shrink wrapping body (15) is displayed in a shop front, it will be hand-held to a shrink wrapping body (15). There is a risk that a person who has stretched the arm may injure his / her fingers by the corners (21) of both side surfaces (18) at one end, which becomes the front end side, which may cause a problem in safety. Further, since the concavity and convexity due to the corners (21) are formed on both side surfaces (18) at one end, which is the front end side, the appearance impression is also adversely affected.

  As shown in FIG. 3, a pair of corners (22) are also formed on the other end surface (20) of the shrink wrapping body (15). These corners (22) are used to store the shrink wrapping body (15) over the counter. It is hidden in the other end face (17) which is the bottom face side of the article (8) to be packaged. Therefore, there is little risk of damaging a finger by the corner portion (22) on the other end surface (20) side when reaching out to the displayed shrink wrapping body (15), and the corner portion (22 on the other end surface (20) side). ) Is not a problem because there is no risk of inconvenience in appearance.

  And in order to eliminate the disadvantage by the corner | angular part (21) formed in the one end both sides | surfaces (18) of the above shrink packaging bodies (15), as shown in FIG. 1, in the advancing direction of shrink oven (5). A roller driving body (6) is arranged. That is, as shown in FIG. 5, the roller driving body (6) has a fixed plate (23) fixed in a horizontal direction by a pair of support rods (32), and the bottom surface of the fixed plate (23) A sliding body (24) capable of sliding in the direction of the conveyor (7) along the bottom surface is fixedly arranged at a position facing the conveyor (7).

  Further, as shown in FIG. 5, a pair of shaft bodies (25) are provided on both sides of the sliding body (24) on the bottom surface side of the fixing plate (23), and as shown in FIG. (25) pivotally supports the rear end of the roller body (26). The roller body (26) is formed in a plane oval shape, and is rotatable in the horizontal direction with respect to the fixed plate (23) around the shaft body (25). Further, as shown in FIG. 5, a roller (27) is connected to the bottom surface of the roller body (26) on the tip (31) side so that the roller (27) can be rotated with respect to the roller body (26). .

  Further, the sliding body (24) arranged on the fixed plate (23) and the pair of roller bodies (26) are connected by the pair of connecting bodies (28), respectively. That is, as shown in FIG. 4, one end of the coupling body (28) is pivotally supported by the sliding body (24) and the other end is non-rotatably coupled to the center of the upper surface of the roller body (26). It is fixed.

  When the sliding body (24) is slid in the advancing direction by assembling the sliding body (24), the roller body (26), and the coupling body (28) as described above, the coupling body (28) Is moved in the advancing direction while rotating about the shaft support (30) to the sliding body (24), and the pair of roller bodies (26) is centered on the shaft body (25) by the movement of the connecting body (28). As shown in FIG. 4, the tip (31) side of the roller body (26) expands on both sides of the conveyor (7). On the other hand, when the sliding body (24) is slid in the direction opposite to the advancing direction, the connecting body (28) moves to the side opposite to the advancing direction while rotating about the shaft support (30). As a result of the movement of the connecting body (28), the tip (31) side of the pair of roller bodies (26) is rotated in the direction opposite to the expanding direction, and as shown in FIG. 8, toward the center in the width direction of the conveyor (7). Move.

  Further, the shrink wrapping body (15) on the conveyor (7) passes through a sensor (not shown) disposed on the conveyor (7) located below the fixed plate (23), so that the sensor is shrunk in the shrink wrapping. The body (15) is sensed and a signal is transmitted to the roller drive body (6), whereby the roller drive body (6) is operated to slide the slide body (24) and rotate the roller body (26). Is to be done. The roller (27) is set to always rotate while the roller driving body (6) is operating. Further, until just before the shrink package (15) reaches the sensor, the roller body (26) is set to stand by with the tip (31) side expanded on both sides of the conveyor (7) as shown in FIG. Has been.

  When the shrink wrap (15) passes through the sensor, the sensor transmits a signal to the roller driving body (6), and the sliding body (24) of the roller driving body (6) is opposite to the traveling direction. To slide. As a result of the sliding of the sliding body (24), the pair of roller bodies (26) spread on both sides of the conveyor (7) as shown in FIG. 4 is rotated inward via the connecting body (28). 6 and 7, the roller (27) positioned on the tip (31) side of the roller main body (26) comes into contact with both sides of the shrink package (15) on the conveyor (7).

  At this time, each roller (27) assembled to the roller body (26) abuts on both sides of the shrink package (15) while rotating with respect to the roller body (26). Thus, it is possible to continuously press and contact the rollers (27) on both sides of the shrink package (15) while transferring the shrink package (15) on the conveyor (7). Accordingly, the roller (27) can be pressed and contacted along the arc of one end of the article (8) to be packaged in the shrink package (15) being transferred. Therefore, as shown in FIG. 9, the shrink package (15) It becomes possible to crush a pair of corner | angular parts (21) formed in the one end both sides | surfaces (18). Moreover, since the roller (27) can be pressed and contacted while maintaining the transport state of the shrink package (15) as described above, the flow of the shrink package (15) on the conveyor (7) is stopped during the press contact. It is possible to efficiently manufacture the shrink-wrapped product (2) without causing it to occur.

  In order to reliably crush the corners (21) of the shrink package (15) by the roller (27) as described above, as shown in FIG. 4, the shrink package before reaching the roller driver (6). (15) is arranged so that the corners (21) are located on both sides in the axial direction of the conveyor (7). Thereby, it becomes possible to reliably press-contact the corner portion (21) by the rollers (27) located on both sides of the shrink package (15). And a pair of corner | angular part (21) press-contacted by the roller (27) plastically deforms to the shape along the shape of the one end surface (16) of the package (8) as shown in FIG. The manufacture of the shrink package (2) is completed.

  When the corner portion (21) is pressed against the roller (27), the temperature of the corner portion (21) on one end side surface (18) of the shrink package (15) is caused by plastic deformation of the shrink film (10). It is kept at a possible temperature and below the melting point of the shrink film (10). That is, when the shrink film 10 is melt-cut, the shrink film 10 has reached the melting point or higher, but the shrink of the shrink package 15 is reached from the melt-cut until it reaches the roller 27. Since the film (10) is kept in a room temperature environment except when it passes through the shrink oven (5), it shrinks when the corner (21) of the shrink package (15) reaches the roller (27). It falls below the melting point of the film (10).

  Further, as described above, the corners (21) are crushed and plastically deformed by pressing and contacting the both side surfaces (18) of one end of the shrink wrapping body (15) to the rollers (27). At the time of press contact, the corners (21) of both side surfaces (18) at one end are kept at a temperature at which the shrink film (10) can be plastically deformed. Here, as a result of dynamic viscoelasticity measurement (measuring device: dynamic viscoelasticity measuring device DMS6100 manufactured by SII NanoTechnology Co., Ltd.) for the shrink film (10) of this example, the shrink film (10) of this example The melting point was 131 ° C, and the softening point, that is, the lowest temperature among plastic deformable temperatures was 104.6 ° C.

  As another different embodiment, when a polypropylene-based shrink film (10) (trade name: OP shrink) manufactured by Okura Kogyo Co., Ltd. is used, the melting point of the shrink film (10) is 128 ° C. and the softening point is 106.degree. When a polypropylene shrink film (10) (trade name: Sopra) manufactured by Sekisui Film Co., Ltd. was used, the melting point of the shrink film (10) was 111 ° C. and the softening point was 74.2 ° C.

  As described above, the shrink wrapping product (2) in which the corners (21) on both sides (18) at one end of the shrink wrapping product (15) are crushed and plastically deformed is manufactured, so that the customer can handle the product. There is no risk of damaging the fingers due to the corners (21) of the side surfaces (18) at one end positioned on the front end side when being stretched, and the shape of the one end surface (16) of the article (8) to be packaged. In addition, since the shrink film (10) is disposed and the unevenness on the surface of the product is not formed, the appearance can be improved. In addition, as described above, the present invention transfers the shrink package (15) on the conveyor (7) by a simple method of arranging a pair of rollers (27) in a production line that has been used conventionally. Since the corner (21) can be crushed, there is no need for extra costs and labor, such as providing a new production line or moving the article (8) on the conveyor (7) to another line. There is no need to spend, and it is economical and efficient.

  Then, as described above, the roller (27) presses and contacts the corners (21) of both side surfaces (18) of the shrink wrapping body (15), and then the sliding body (24) of the roller driving body (6) moves in the traveling direction. As shown in FIG. 4, the tip (31) side of the roller body (26) is expanded to restore the roller (27) to its original position. Further, the shrink package (2) formed by the press contact of the corner (21) as described above is transferred to the next step by the conveyor (7) as shown in FIG.

2 Shrink Wrapped Items 7 Conveyor 8 Packaged Items 10 Shrink Film 13 Melt Cut Part 15 Shrink Wrapped Body 18 One Side Both Sides 21 Corner 27 Roller

Claims (1)

A cylindrical object is covered with a shrink film in a lengthwise direction with a column-shaped one end formed in an arc shape, and the shrink film is melt-cut at both ends of the package to close both ends to form a bag. And forming a shrink wrapping body in which the shrink film is closely arranged on an object to be packaged by thermally shrinking the bag-shaped shrink film. The direction of travel of the arc-shaped one end of the shrink wrapping body in a state where the temperature of the corners of the pair of shrink films formed on both side surfaces of the one end of the film is a temperature at which the shrinkage of the shrink film can be plastically deformed and below the melting point In the rear side, the other end portion is arranged on the front end side, and a pair of rollers is provided on both sides in the traveling direction of the shrink package. The shrink wrapping body is transferred by a conveyor, and when the shrink wrapping body reaches the pair of rollers, the pair of rollers is moved toward the center in the width direction of the conveyor, and the pair of rollers is shrunk wrapping. A method for producing a shrink-wrapped product, characterized in that a corner portion can be crushed while being transported on the conveyor by pressing along one arc-shaped end portion of the body .

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