JP2006103765A - Method for manufacturing shrink package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a shrink package for applying a heat^shrinking cylindrical film to an item to be packaged without using any hollow float and for shrinking the film with heat. <P>SOLUTION: A method for manufacturing a shrink package packaged with a heat shrinking cylindrical film is carried out by inserting a folded cylindrical film through a 90-degree inverted float, opening two original folding lines through inverting it, transferring the cylindrical film downward by a film transfer roller press contacted with the lower part of the inverting float, transferring the cylindrical film downward while an opening end of the cylindrical film by sucking it with a pair of suction driving belts arranged below the inverting float of which space is made wide toward the downward direction, cutting the cylindrical film of predetermined length with a cutter in a lateral direction when the cylindrical film is transferred downward, applying the cut cylindrical film onto the package by dropping the film and shrinking the cylindrical film applied over the package through heating. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a shrink package. More specifically, the present invention relates to a method for manufacturing a shrink package, in which a heat-shrinkable tubular film is attached to an object to be packaged without using a hollow float, and the film is shrunk by heating.

Shrink wrapping, which is pre-printed with a heat-shrinkable film applied to a container and shrinks to protect the container and use it as a label, is low in packaging material costs and easy to automate the process. Therefore, it is applied to a wide range of fields, from mechanical parts, electrical products, furniture, etc. to foods, miscellaneous goods, stationery, etc. In particular, sleeve packaging using a tubular heat-shrinkable film can simplify the packaging process compared to pillow packaging or four-side seal packaging, and is therefore frequently used for packaging containers having a substantially columnar shape.
Conventionally, when a heat-shrinkable tubular film is attached to a container which is an object to be packaged, the tubular film is passed through a custom-made hollow float manufactured according to the shape of the container by a pull-down belt, and directly below the hollow float. Generally, a method of depositing a tubular film on a container transferred to the container has been performed. However, according to this method, a holding force is required to hold the hollow float, and wrinkles are generated in the tubular film due to the frictional force between the float and the film when the tubular film passes through the hollow float. In some cases, the tubular film does not pass through the hollow float.
When the supply speed of the container is increased, the speed of the pull-down belt is increased accordingly, and the holding force of the hollow float needs to be increased. In addition, the frictional force between the tubular film, hollow float, and pull-down belt increases, and many wrinkles occur in the tubular film, the pulling failure of the tubular film frequently occurs, and in extreme cases, the hollow float drops. A situation occurs.

  The present invention was made for the purpose of providing a method for manufacturing a shrink package, in which a heat-shrinkable tubular film is attached to an object to be packaged without using a hollow float, and the film is shrunk by heating. It is.

As a result of intensive research to solve the above problems, the present inventors have made the heat-shrinkable tubular film that has passed through the 90 ° inversion float downward from the upper side provided below the 90 ° inversion float. It is sucked by a pair of endless suction drive belts that are widened toward each other and moved downward while opening the open end of the tubular film, and the tubular film is cut into a predetermined length by a cutter, and the open end is cut. It was found that by dropping the opened tubular film by driving the suction drive belt, the tubular film can be stably attached to the package without using a hollow float, and the present invention is based on this finding. It came to complete.
That is, the present invention
(1) In a method of manufacturing a shrink package that is wrapped with a cylindrical film that is at least thermally contracted in the circumferential direction, the cylindrical film folded flat is inserted through a 90-degree reversal float and inverted by 90 degrees. The two fold lines are opened, and the cylindrical film is transferred downward by a pair of film feed rollers pressed against the lower part of the 90-degree reversal float, and downward from the upper side provided below the 90-degree reversal float. A pair of endless suction drive belts with wide intervals sucks the original two fold lines and moves them downward while opening the opening end of the tubular film, so that the tubular film of a predetermined length moves downward. When transported, the tubular film is cut in the width direction by a cutter provided between the 90 ° reversal float and the suction drive belt, and the tubular film is cut and opened at the open end. It is applied to the packaged articles by dropping the Lum by driving the suction drive belt, a manufacturing method of shrink wrapping body, characterized in that shrinking by heating the tubular film that was deposited on the packed material,
(2) The endless suction drive belt has suction holes arranged in the belt length direction, is driven by the suction drive roller and / or the drive roller, and is in a position in contact with the suction hole of the suction drive belt. The manufacturing method of the shrink package according to (1), wherein the inside having the suction slit slides on the surface of the suction box maintained at a reduced pressure,
(3) The shrink-wrapping body according to (1), wherein the tubular film which has been cut and opened at the open end is dropped by driving the suction drive belt, and at the same time, the open end of the subsequent tubular film is opened and transferred downward. Manufacturing method, and
(4) The article to be packaged is placed on the belt conveyor and transferred, and when the article to be packaged reaches a predetermined position, a signal is sent to the suction drive roller and / or the drive roller, and the opening end is cut off. The manufacturing method of the shrink wrapping body according to (2), in which the opened tubular film is dropped,
Is to provide.

  According to the manufacturing method of the shrink wrapping body of the present invention, since the obstacle due to the frictional force between the hollow float and the tubular film does not occur, the tubular film can be reliably attached to the package, Speed can also be improved significantly. Moreover, since the hollow float is unnecessary, the number of parts of the packaging equipment is reduced, it is not necessary to manufacture a hollow float for replacement according to the shape of the container, and there is no mechanical trouble, The shrink package can be manufactured stably and economically.

In the manufacturing method of the shrink wrapping body of the present invention, in the manufacturing method of the shrink wrapping body that is packaged by at least the cylindrical film that thermally shrinks in the circumferential direction, the cylindrical film folded flat is inserted into the 90 ° reversal float. Then, the original two folding lines are opened by reversing 90 degrees, and the cylindrical film is transferred downward by a pair of film feed rollers pressed against the lower part of the 90-degree reversal float, and below the 90-degree reversal float With a pair of endless suction drive belts, the distance between which is extended downward from above, the original two fold lines are sucked and transferred downward while opening the opening end of the cylindrical film, When the length of the tubular film is transferred downward, the width of the tubular film is reduced by the cutter provided between the 90 ° reversal float and the suction drive belt. Cut into, is applied to the packaged articles by dropping the tubular film that opened the open end is cut by driving the suction drive belt, it is contracted by heating the tubular film that was deposited on the packed material.
Examples of the tubular film that is thermally contracted at least in the circumferential direction used in the method of the present invention include, for example, a tubular film formed by an inflation method, and both side edges of a film formed by a T-die stretching method are heat-sealed. The cylindrical film etc. which are obtained by this can be mentioned. There is no restriction | limiting in particular in the material of the cylindrical film used for this invention method, For example, a polyethylene film, a polypropylene film, a polystyrene film, a polyvinyl chloride film, a polyethylene terephthalate film, a multilayer polyolefin film etc. can be mentioned.

Drawing 1 is an explanatory view of one mode of a cylindrical film adhesion mechanism used for a manufacturing method of a shrink packing object of the present invention. The heat-shrinkable tubular film 1 folded flat is inserted through the upper part 2 of the 90-degree reversal float, and reversed at the middle part 3 of the 90-degree reversal float to open the original two fold lines. The two fold lines are positioned at the approximate center of the two front and back films of the cylindrical film, and are transferred downward by a pair of film feed rollers 5 that press against the lower part 4 of the 90 ° reversal float.
A pair of endless suction drive belts 6 are provided below the 90-degree reversal flow so that the interval increases from the top to the bottom. In the embodiment shown in FIG. 1, the endless suction drive belt is driven by the suction drive roller 7 and the drive roller 8, and circulates without end while sliding on the surface of the suction box 10 via the auxiliary roller 9. be able to. The inside of the suction box is kept at a reduced pressure by sucking air from the suction port 11.
The cylindrical film transferred downward from the 90-degree reversal float is sucked by the pair of suction drive belts, and the original two fold lines are sucked and transferred downward while opening the opening end of the cylindrical film. When the cylindrical film having a predetermined length is transferred downward, the cutter 12 provided between the 90-degree reversal float and the suction drive belt operates to cut the cylindrical film in the width direction. In this state, the suction drive belt is stopped, and the tubular film that has been cut and opened at the open end can be put on standby. When the width of the tubular film folded flat is w, and the distance between the lower ends of the pair of suction boxes is d, the opening end of the tubular film has a substantially circular shape by d = 0.6w. can do.

When the article 13 to be packaged is transferred directly under the tubular film that has been cut and opened at the open end, the suction drive belt is driven to drop the tubular film that has been cut and opened at the open end. The opening end of the tubular film opens in a substantially circular shape, and the tubular film at the rear of the opening end is also sucked by the suction drive belt and falls into a substantially circular cross section so that it can be smoothly attached to the package. There is no risk of wrinkles. The article to be packaged attached to the tubular film is sent to a heating tunnel or the like, and the heat-shrinkable tubular film is shrunk by heating to complete a shrink package.
It is preferable that the pair of suction drive belts 6 used in the method of the present invention has a structure that rotates around the suction drive roller 7 and can adjust the distance d between the lower ends of the suction box 10. By adopting a structure in which the distance d between the lower ends of the suction boxes can be adjusted, it is possible to manufacture a shrink package using the same apparatus for cylindrical films having different widths w. In the conventional method using a hollow float, if the thickness of the article to be packaged, and thus the width of the tubular film, is changed, a corresponding hollow float is required. In addition, according to the method of the present invention, the opening end of the tubular film is fastened slightly above the lower end of the suction box, or the opening end of the tubular film is lower than the lower end of the suction box, even for packages having different heights. The length of the tubular film to be cut can be adjusted to some extent by hanging slightly downward. Therefore, according to the method of the present invention, it is possible to economically manufacture shrink packages having various sizes and shapes by using only one tubular film deposition facility by replacing only the 90 ° inversion float.

  In the method of the present invention, suction holes arranged in the length direction of the belt are provided in the endless suction drive belt, and the suction drive roller and / or the drive roller is used to perform suction at a position in contact with the suction hole of the suction drive belt. The inside having the slit can be slid on the surface of the suction box maintained at a reduced pressure. FIG. 2 is a partial front view of an aspect of the suction drive belt, a front view of an aspect of the suction box, and a front view showing an aspect of a state in which the suction drive belt and the suction box are combined. The suction drive belt 6 is provided with a number of suction holes 14 arranged in the length direction of the belt. The suction box 10 is provided with a suction slit 15 at a position in contact with the suction hole of the suction drive belt. The suction drive belt 6 is driven by the suction drive roller 7 and the drive roller 8 and slides on the surface of the suction box 10. Since the suction hole 14 of the suction drive belt exists at a position in contact with the suction slit 15 of the suction box, the reduced pressure inside the suction box is transmitted to the suction hole of the suction drive belt through the suction slit, and the suction of the suction drive belt The hole can suck and hold the tubular film by the reduced pressure.

FIG. 3 is a partial front view of another aspect of the suction drive belt, a front view of another aspect of the suction box, and a front view showing another aspect of a state in which the suction drive belt and the suction box are combined. The suction drive belt 6 is provided with a large number of suction holes 14 arranged in a staggered manner in the length direction of the belt. The suction box 10 is provided with a suction slit 15 at a position in contact with the suction hole of the suction drive belt. The suction drive belt 6 is driven by the suction drive roller 7 and the drive roller 8 and slides on the surface of the suction box 10. Since the suction hole 14 of the suction drive belt exists at a position in contact with the suction slit 15 of the suction box, the reduced pressure inside the suction box is transmitted to the suction hole of the suction drive belt via the suction slit, and the suction of the suction drive belt The hole can suck and hold the tubular film by the reduced pressure.
FIG. 4 is a partial front view of another aspect of the suction drive belt, a front view of another aspect of the suction box, and a front view showing another aspect of the state in which the suction drive belt and the suction box are combined. The suction drive belt 6 is provided with a plurality of suction holes 14 arranged in two rows in the length direction of the belt. The suction box 10 is provided with two suction slits 15 at positions in contact with the two rows of suction holes of the suction drive belt. The suction drive belt 6 is driven by the suction drive roller 7 and the drive roller 8 and slides on the surface of the suction box 10. Since the suction hole 14 of the suction drive belt exists at a position in contact with the suction slit 15 of the suction box, the reduced pressure inside the suction box is transmitted to the suction hole of the suction drive belt via the suction slit, and the suction of the suction drive belt The hole can suck and hold the tubular film by the reduced pressure.

  In the method of the present invention, the rotation of the suction drive roller 7 and the drive roller 8 and the peripheral speed of the film feed roller 5 are synchronized, and the tubular film cut by the suction drive belt 6 and opened at the open end is dropped. At the same time, it is preferable to move downward while opening the open end of the subsequent cylindrical film. When the tubular film that has been cut by driving the suction drive belt 6 and opened at the open end begins to drop, a state in which the tubular film does not exist occurs above the suction drive belt. At this time, rotation of the film feed roller 5 is started, and the opening end of the succeeding tubular film is fed into the suction drive belt, thereby dropping the cut tubular film having the opening end attached to the package. And the operation of transferring downward while opening the opening end of the subsequent cylindrical film can be performed simultaneously. As a result, when the preceding tubular film falls and adheres the object to be packaged, the succeeding tubular film opens the opening end and is held by the suction drive belt, the rear end is cut by the cutter, and the object to be packaged When it is transferred directly underneath, it is ready to start dropping. In this way, the cycle time for attaching the tubular film to the package is shortened to improve productivity, and the suction hole of the suction drive belt is eliminated from being covered with the tubular film. It is possible to prevent wasteful consumption of energy for sucking air from the holes and maintaining the suction box at a reduced pressure.

In the method of the present invention, the article to be packaged is placed on a belt conveyor and transferred, and when the article to be packaged reaches a predetermined position, a signal is sent to the suction drive roller and / or the drive roller to be cut. It is preferable to drop the cylindrical film having an open end. The predetermined position is preferably just below the cut tubular film held by the suction drive belt and having an open end. Since the opening end of the tubular film is opened in a substantially circular shape, the tubular film can be smoothly attached to the package by dropping the tubular film in a state where the package is present. In addition, when the shape of the cross section of the package is other than a circle such as an ellipse, a triangle, or a quadrangle, the cylindrical film is adjusted to the cross section of the package by adjusting the angle of the front and rear suction drive belts. It can be opened in shape and deposited.
In the method of the present invention, there is no particular limitation on the means for detecting that the article to be packaged has reached a predetermined position. For example, a photoelectric sensor, a proximity sensor, a position sensor, or the like can be used. Since the suction drive belt can be driven quickly and can drop the cylindrical film in a short time, without stopping the belt conveyor on which the article to be packaged is placed, while the article to be packaged is transferred at a constant speed, A cylindrical film can be attached to the package.

  According to the manufacturing method of the shrink package of the present invention, the heat-shrinkable tubular film is attached to the package using the drive roller and the suction drive belt, and the conventional hollow float is unnecessary. The obstacle due to the frictional force between the hollow float and the tubular film does not occur, the tubular film can be reliably adhered to the package, and the deposition speed can be greatly improved. In addition, since there is no need for a hollow float, the number of parts in the packaging equipment is reduced, and it is not necessary to produce a replacement hollow float that matches the shape of the packaged object, and there is no mechanical trouble. Thus, the shrink package can be manufactured stably and economically.

It is explanatory drawing of the one aspect | mode of the cylindrical film deposition mechanism used for this invention method. It is a front view of one mode of a suction drive belt and a suction box. It is a front view of other modes of a suction drive belt and a suction box. It is a front view of other modes of a suction drive belt and a suction box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat shrinkable cylindrical film 2 Upper part of 90 degree reversal float 3 Middle part of 90 degree reversal float 4 Lower part of 90 degree reversal float 5 Film feed roller 6 Suction drive belt 7 Suction drive roller 8 Drive roller 9 Auxiliary roller 10 Suction box 11 Suction port 12 Cutter 13 Packaged object 14 Suction hole 15 Suction slit

Claims (4)

  In the manufacturing method of the shrink wrapping body which is packaged by the cylindrical film which is thermally contracted at least in the circumferential direction, the original two pieces are inserted by inserting the cylindrical film folded flat into a 90 ° inversion float and inverting 90 °. The folding film is opened, and the cylindrical film is transferred downward by a pair of film feed rollers pressed against the lower part of the 90-degree reversal float, and the interval is expanded downward from the upper part provided below the 90-degree reversal float. The pair of endless suction drive belts sucked the original two fold lines and moved them downward while opening the open end of the tubular film, and the tubular film of a predetermined length was transported downward. When the tubular film is cut in the width direction by a cutter provided between the 90 ° reversal float and the suction drive belt, the cut and opened opening film Is applied to the packaged articles by dropping by the driving of the suction drive belt manufacturing method of shrink wrapping body, characterized in that shrinking by heating the tubular film that was deposited on the packed material.   The endless suction drive belt has suction holes arranged in the length direction of the belt, and is driven by the suction drive roller and / or the drive roller, and a suction slit is formed at a position in contact with the suction hole of the suction drive belt. The manufacturing method of the shrink package body of Claim 1 which slides on the surface of the suction box by which the inside which was kept at pressure reduction.   2. The method of manufacturing a shrink package according to claim 1, wherein the tubular film cut and opened at the open end is dropped by driving the suction drive belt, and at the same time, the open end of the subsequent tubular film is opened and transferred downward.   A cylinder in which an object to be packaged is placed and transferred on a belt conveyor, a signal is sent to the suction drive roller and / or the drive roller upon detecting that the object to be packaged has reached a predetermined position, and the cylinder is opened and opened. The manufacturing method of the shrink package body of Claim 2 which drops a film-like film.

Images