JPH0567497B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to half-shrink packaging in packaging machines (see FIG. 5).

[Conventional technology]

In half-shrink packaging, a can 2 housed in a case 1 as shown in FIG.
As shown in FIG. 2, a film 3 is placed over the case 1 and the can 2, and heated in a heating furnace to shrink the film while covering the case 1 and the can 2.

Conventionally, this half-shrink packaging has been carried out using an apparatus shown in FIG. In the figure, the case 1 flowing on the conveyor 10 is turned 90 degrees by the turning device 15 so that the longitudinal direction of the case 1 becomes the traveling direction, and then adhesive is applied to the left and right sides of the case in the longitudinal direction using a gun 060. After applying the adhesive with
send it to. Here, film 3 and flight bar 2
The film 3 of each case is adhered to the case 1 with adhesive using a partition plate called 1. Here, the wrapper 20 holds and moves the flight bar 21 with an endless chain 22. 26 is a drive gear for the endless chain 22, and 25 is a device for cutting the film 3 between the cases. The case a covered with the film 3 for each case enters a heating furnace 30, where the film is thermally shrunk to tightly package the case. Thereafter, the film 3 is pressed against the case in the advancing direction, that is, on the side surface to which no adhesive is applied, using the roller 35, and the process is completed.

[Problem to be solved by the invention]

Case 1 packed using conventional equipment as described above
Since the adhesive 5 can only be applied to the longitudinal side surface of the case 1 as shown in FIG. 7a, when it leaves the heating furnace 30 in FIG. , that is, the part indicated by 6 in the figure is the roller 3
Since it is only pressurized at step 5, it does not adhere to the case 1 sufficiently and is easily peeled off. Products packaged using this method have problems such as weak packaging strength.

The present invention aims to solve the above-mentioned problems and provide a packaging method with strong packaging strength.

[Means to solve the problem]

(1) Apply adhesive not only in the longitudinal direction of the case but also in the width direction.

(2) The coating method is to apply directly to the cases flowing on the conveyor using four guns, two on each side.

(3) To adhere the film in the width direction of the case, press the film with air or mechanically adhere with a guide.

[Effect]

Figure 2 shows the adhesive application method. a shows a plan view. Two guns 50 and 60 for applying adhesive are arranged on the left and right sides of the conveyor 10, respectively. This gun 50,6
0 is arranged at about 45 degrees with respect to the direction of movement of the conveyor 10. When the case 1 flows on the conveyor 10, when the front side surface of the case reaches a point, the left and right front guns 50 start applying adhesive.
Coating is started using the gun 60 at a point on the rear side of the case. Then, when the case 1 moves to the 1' position, the application of the gun 50 is stopped at the point, and the application of the gun 60 is stopped at the point.
Stop applying.

By this method, as shown in Fig. 2b, the front side of the case 1 is coated 5 toward both ends with the center point M of the tray as a reference, and the side surface of the case in the direction of conveyor movement is also coated 5'. and completes at point N.

On the rear side of the case, as shown in FIG.
Complete the application at point M in the center of the case while applying to the longitudinal surface.

When the adhesives 5 and 5' are applied to the four sides of the case 1 in this manner, the packaging form shown in FIG. 4 is obtained.

Figure 4a shows case 1 with adhesives 5 and 5' applied.
FIG. 4b shows the product after film packaging. As shown in the figure, the film 3 is adhered to all four sides of the case, so that it can be packaged securely.

〔Example〕

FIG. 1 shows an embodiment of the packaging method of the present invention.

Detection sensors 51 and 61 for the case 1 are provided on the upstream side of the conveyor 10, and adhesive is applied to the case 1 using adhesive application guns 50 and 60 placed on the left and right sides of the conveyor 10 based on the signals detected by these sensors. do. After gluing the film 3 with the wrapper 20 and cutting it off with the cutting device 25, the case 1
Fold the film 3 in the width direction, that is, the side facing the direction of conveyor movement, using wrap folding guides 70 and 71,
Glue. After that, it is shrunk in a heating furnace 30, and then finished by pressing the side surface with a finishing roller 35.

Here, glue the film in the width direction of case 1 at 7
Although the flap-folding guide shown by 0.71 is used, the method is not limited to this, and the method shown in FIG. 3 may also be used.

FIG. 3a shows a method in which compressed air is blown from a nozzle 80 onto the portion of the film 3 indicated by the flap 6 to bond it to the adhesive 5'.

In this method, in FIG.
It may be bonded immediately after cutting the film within 0.

The method shown in FIG. 3b is a method using a flap folding guide 90 and a folding jig 91.

The flap folding guide 90 is a fixed guide for folding the film flap 6' of the case 1, and 91 is a reciprocating folding jig for folding the flap 6 into the fixed guide 90, which is used for folding the film flap 6' of the case 1. This is similar to the flap folding of the device.

〔Effect of the invention〕

In the present invention, a large number of cases in which products are housed in a manner that protrudes upward from the open top surface of the case is conveyed by a conveyor, adhesive is applied to the side surface of each case, and then a heat-shrinkable film is supplied. In this packaging method, two adhesive application guns are placed on each side of the conveyor, in which the film is adhered to the case with the adhesive on the conveyor, the film is cut for each case, and the film is shrunk in a heating furnace. Then, the two guns at the front apply adhesive to the front of the case and the front of the left and right sides, and the two guns at the back apply adhesive to the rear of the case and the rear of the left and right sides, and apply adhesive to the four sides of the case. By adhering the film with the applied adhesive, the following effects are achieved.

When packaged by the method according to the invention, 4 of the cases
The corners are completely covered with film, and the film is bonded to the four sides of the case, improving packaging strength. When compared in a drop test in which the case is dropped from a height of 1.5 m to the floor, the conventional method breaks the corner of the case after only one drop, whereas the present invention has the strength to withstand breakage up to three times.

Furthermore, since there is no need to turn the case over when applying adhesive, there is also the advantage that the line can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a packaging device implementing the present invention;
Figure 2a is a plan view showing the arrangement of the adhesive application guns in Figure 1, Figures 2b and c are explanatory diagrams of the adhesive application situation by the front and rear guns, and Figures 3a and b are for the case. Schematic diagram illustrating another method of flap folding a film on the widthwise side surface of the
Figures a and b are perspective views showing the adhesive application situation and packaged products according to the present invention, Figures 5 a and b are explanatory diagrams of half-shrink packaging, Figure 6 is a perspective view of a conventional packaging device, and Figure 7 Figures a and b are perspective views showing a conventional adhesive application situation and packaging method. 1... Case, 3... Film, 10... Conveyor, 20... Rapper, 25... Cutting device, 3
0...Heating furnace, 50,60...Gun.

Claims (1)

[Claims] 1 A conveyor transports a large number of cases in which the products are stored in a manner that protrudes upward from the open top surface of the case. After applying adhesive to the side of each case, a heat-shrinkable film is supplied and the product is placed on the conveyor. After gluing the film to the case with the above adhesive,
In a packaging method in which the film is cut for each case and then shrunk in a heating oven, two adhesive application guns are placed on each side of the conveyor, and the two guns at the front are used to coat the front and left and right sides of the case. A packaging characterized in that adhesive is applied to the front, the two guns at the rear apply adhesive to the rear of the case and the left and right sides, and the film is bonded with the adhesive applied to the four sides of the case. Method.