JP2934931B2 - Packaging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a belt-like film to be continuously drawn out to form a large number of trays at equal intervals, and covering an object to be packed in each tray with an upper film. The present invention relates to a packaging device for packaging.

[0002]

2. Description of the Related Art As a general tray molding and packaging apparatus, as seen in a booster shaping apparatus, for example, a strip-shaped film is sucked into a concave forming device with a vacuum suction force while heating, thereby forming a large number of concave portions at equal intervals. Along with the formation, after each of the concave portions is filled with the article to be packaged, an upper film is placed thereon to seal the article to be packaged. JP-A-5-65
107 discloses an efficient device for forming a continuous film into a continuous groove shape by a plurality of longitudinal folds, covering the film with an upper film, and cross-sealing the cylindrical film at equal intervals. I do.

[0003]

However, the three-dimensional package formed by the above-described apparatus does not have a structure in which the container itself is three-dimensional, but the three-dimensional container is maintained by the presence of the object to be packaged therein. Since the container always tends to flatten, the package and the container are always in close contact. For this reason, in the case of a packaged product such as a cream cake, there is a problem that dirt is generated on the inner surface of the container, and there is a problem that the flexible packaged product is deformed by the restoring force of the container.

[0004]

According to the present invention, a container is provided with a three-dimensional structure, and in order to preserve a certain space between the container and an object to be packaged, a sharp point is formed along a longitudinal drawing direction of the band-shaped film. Means for forming two inner folds on the film and two outer folds closer to both outer sides than the inner fold by friction with the square plate, and an upper and lower means for crushing the film flat in each of the fold directions. Two clamping rolls,
A channel forming means for expanding the crushed film into a channel again, and a band-shaped film formed on the channel film at the same speed as the channel film so as to cover an object to be packaged in the channel film. Means for covering the upper film and welding the upper film to horizontal flanges on both sides of the outer fold of the channel film;
Pressing both side surfaces of the grooved film inward toward the front and rear sides of a pair of seal bars to which the grooved film and the upper film are pressed and welded at a predetermined time interval from above and below just before the seal bar approaches 4 A rod-shaped push-in element of a book,
It consists of four suction blocks which are located before and after each said pushing element and immediately before each pushing element enters the grooved film, sucks both sides of the grooved film with a vacuum suction force and fixes the both sides. I do.

[0005]

[0006]

[0007]

The film is formed in a groove shape while moving by two inner folds and two outer folds formed in the belt-like film, and the articles to be packaged are arranged one after another in the film.
Since both side edges of the band-shaped upper film to be covered from above are continuously welded to the horizontal flanges on both sides of the grooved film, the flanged cylindrical film formed by the grooved film and the upper film is provided. The items to be packaged are arranged at predetermined intervals. Furthermore, in the traveling direction of the tubular film, both side surfaces of the film at the rear end of the front packaged object and the front end of the rear packaged object are sucked by the four support blocks, On both sides of the block, both sides of the film are pushed centrally by means of a pushing element, forming a longitudinal fold in the film between the support block and the pushing element. Thereafter, when the tubular film is pressed flat by the pressed portion, the film retains three-dimensionality due to the presence of the vertical fold.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An endless belt 10 whose center is cut in FIG. 1 forms a loop by supporting a plurality of pulleys 11 and 12, and has an elongated vacuum can 13 installed inside the loop. That is, as shown in FIG. 4, the upper surface opening 14 of the vacuum can 13 is brought into contact with the lower surface of the belt 10 having a large number of suction holes 15, and a vacuum pump is connected to the connection port 16 of the vacuum can. Therefore, FIG.
When the belt 10 is rotated by the driving shaft 17 at
The roll film 19 supported on the shaft 18 has a belt shape, is continuously drawn in the direction of the arrow 20, and is guided to the fold forming means 22 via the idler 21. As shown in FIG. 2, the fold forming means sharpens both side edges 23 and
, And a pair of side horns 27 that sharpen the tip 26 and protrude above the horn 25. The strip film 19 is forcibly slid on each of these horns. As a result, two inner folds 28 and two outer folds 29 are formed on the film. Further FIG.
As shown in FIG. 7, the film that has passed through the fold forming means 22 is pressed by the pair of rolls 30 and 31 to flatten the folds, and the folds are heated by the heater 32. , 34, the heat of the film can be removed to form a distinctive fold in the thermoplastic film.

The film which proceeds further reaches the groove forming means 35. As shown in FIG. 3, the mechanism 35 is constituted by a spatula-like body 37 hung on a machine base via a column 36. After the flat folded film 19 moves over the thin spatula 37 of the tip 38, the film 19 receives the resistance of the thick rear end side surface 49, so that the film side surfaces 39 stand up vertically. Further, the channel forming means 35 in FIG.
Subsequently, a pair of elongated rectangular tubes 40 are provided on both sides of the film passage area. As shown in FIG. 4, the above-mentioned double-sided tube 40 is fixed via a bracket 41, and a large number of small holes 42 are formed in the opposing surfaces thereof so that a relatively gentle vacuum suction force acts on each small hole. Then, the film moves while sliding the square tube 40, and the verticality of both side surfaces 39 and the horizontality of the flange 43 are maintained by the suction force acting on the small hole 42, so that the packaged material from above is inserted into the channel film. Accept 44 supplies.

In FIG. 1, a band-shaped upper film 46 supported on a shaft 45 is pulled by upper and lower draw-out rolls 47 and 78 and is covered on a grooved film 50 (see FIG. 5). Further, the film is pinched by a pair of seal rolls 51 and 52 at the rear thereof, and the horizontal flange 43 on both sides and both side edges of the upper film 46 are continuously heated and sealed 53 as shown in FIG. It is fed into the sealing means 54 of FIG.

As shown in FIGS. 6 and 7, a sealing means 54 slidably supports a frame 56 on two horizontal rod-like rails 55 and swings a pin 58 as a fulcrum by rotation of a cam 57. Is transmitted to the frame 56 via the link 60. Therefore, the frame 56 moves forward and backward at the same speed as the film 50 and retreats for each packaged object. Both sides of a bell crank 62 supported on a frame 56 via a shaft 61 and upper and lower seal bars 63 and 64
Are connected by links 65 and 66, and both ends of the bell crank 62 are inverted as indicated by an arrow 67 by the power applied to the shaft 61, so that the pair of seal bars 63 and 64 move closer to and away from each other.

Also, four suction blocks 68 and 69 are provided on both sides inside the frame 56. Film 5
The blocks 68 on both sides in front of the moving direction 0 are fixed to the frame 56, while the blocks 69 on the other side are fixed to the frame 56.
Are supported by a piston rod 71 of a fluid cylinder 70 fixed to the frame 56. A tube 72 connected to the internal hollow area of each block is connected to a vacuum pump 74 via an electromagnetic valve 73, and a switch 76 connected to an electromagnetic section 75 of the electromagnetic valve 73 is installed near an operation cam 77. Therefore, a vacuum is applied to each of the blocks 68 and 69 only while the frame 56 moves in the same direction as the film 50. As shown in FIG. The vertical surface 39 is sucked.

A pair of rod-like push-in elements 78, two on each side, are slidably supported by the frame 56 in opposition so as to straddle the operating area of the seal bar 63, and a bracket 79 is provided.
The fluid cylinder 80 fixed to the frame and the pushing element 78 are connected to each other. When the switch 82 is closed by the cam 81, the solenoid valve 83 is switched to guide the discharge pressure of the pump 84 to the cylinder 80, so that each pushing element 78 protrudes and pushes both side surfaces 39 of the grooved film into the inside. In this case, since the film suction by the blocks 68 and 69 is maintained, as shown in FIG.
Inevitably vertical folds 8 on both sides of the film
5 are formed. By pushing the film side surfaces 39 inward by the pushing elements 78 on both sides, the gap between the grooved film 50 and the upper film 46 is necessarily closed as indicated by an arrow 83, and the upper and lower seal bars 63, 64 sandwich this portion. Press to heat seal and cut. As a result, as shown in FIG. 10, the ends of the cylindrical film are crushed and welded by the folds 84, and a three-dimensional package is formed by the presence of the vertical folds 85 at the four corners as shown in FIG.

When the frame 56 returns to the original position after the package is formed as described above, the switch 86 is operated by the cam 85 so that at least the front block 68 is not caught by the flange portion of the crushed film. The solenoid valve 87 is switched by operating, and both blocks 6
9 is separated. At the same time, each pushing element 78 is retracted from the side of the film.

[0015]

[Effect] Since the both side surfaces are pushed into the space between the packages while maintaining the verticality of the vertical surfaces on both sides of the channel film, the vertical between the vertical maintaining portion and the boundary portion between the pushing portions. The folds can be formed, and the package is naturally three-dimensionally formed by the vertical folds. Therefore, it is not necessary to support the film with the object to be packaged and make the package three-dimensional as in the conventional package.

[Brief description of the drawings]

[Fig. 1] Side view cut down near the center and shown up and down

FIG. 2 is a view taken along the line II-II in the previous figure.

FIG. 3 is a view taken along line III-III in FIG. 1;

FIG. 4 is a view taken along the line IV-IV in FIG. 1;

FIG. 5 is a view taken along a line VV in FIG. 1;

FIG. 6 is a side view of a cross sealer part.

FIG. 7 is a plan view of the previous figure.

FIG. 8 is an explanatory view in the process of forming a package;

FIG. 9 is an explanatory view in the process of forming a package;

FIG. 10 is an explanatory view of a completed package.

FIG. 11 is a perspective view of a package.

[Explanation of symbols]

10 ... Belt 13 ... Vacuum can 19 ... Film 22 ...
Fold forming means 25: angled plate 27: side angled plate
28 ... inner fold 29 ... outer fold 32 ... heater 3
3, 34 cooling roll 35 groove forming means 37 spatula 39 side surface 46 top film 50 groove film 54 sealing means 68, 69 block
78 ... Push-in element

Claims (2)

(57) [Claims] A means for forming two inner folds on the film and two outer folds closer to both outer sides than the inner fold by friction with a cusp plate along a longitudinal drawing direction of the belt-like film; An upper and lower two pressing rolls for crushing the film flat in each of the fold directions, a groove forming means for expanding the crushed film again into a groove shape, and a cover in the groove film. Means for covering a strip-shaped upper film on the grooved film at the same speed as the grooved film so as to cover the package, and welding the upper film to horizontal flanges on both sides of the outer fold of the grooved film; Four inwardly pushing both side surfaces of the grooved film inwardly immediately before the seal bar approaches the front and rear sides of a pair of seal bars to which the grooved film and the upper film are pressed and welded at predetermined time intervals from above and below. A rod-shaped push-in element, and four pieces which are located before and after each of the push-in elements and which are sucked by vacuum suction on both side faces of the groove-shaped film by a vacuum suction force immediately before these push-in elements enter the grooved film. Packaging device comprising a suction block. 2. The four supporting blocks are moved in the same direction as the grooved film by a predetermined range while adsorbing both side surfaces of the grooved film with a vacuum suction force, and then cut the vacuum to form the grooved film. Four push-in elements and upper and lower seals which move in the same direction and at the same speed when the support block is moving in the same direction as the channel film, while continuously repeating a so-called block motion returning in the opposite direction. 2. The packaging apparatus according to claim 1, wherein a bar is used to push both sides of the grooved film inwardly between the respective support blocks and to flatten the film from above and below.