JPH01294405A - Heat sealing method in sanitary napkin packing machine - Google Patents

Abstract

PURPOSE:To heat seal the overlapping part of an outer sheet and prevent the adhesion of the molten surface of wrapping sheet to a heating member, by forming a fusion layer having a low melting point on the wrapping sheet, packaging commodities therein with the fusion layer inside and heating the outer sheet to a temperature lower than the melting point of the wrapping sheet and higher than that of the fusion layer. CONSTITUTION:An outer sheet B consists of wrapping sheet 1 made of the polyethylene sheet having a high melting point and a fusion layer 2 of polypropylene having a low melting point formed thereon in only attachment areas. A sanitary napkin A is placed at a predetermined location on the outer sheet B and enclosed therein by overlapping both sides thereof. A heating member applies heat along the overlapping part of the outer sheet B in contact with the wrapping sheet 1. The temperature of the heating member is kept between the high melting point of the wrapping sheet 1 and the low melting point of the fusion layer 2. The fusion layer 2 is melted to serve as an adhesive agent, while the wrapping sheet 1 is not melted, preventing the adhesion of the wrapping sheet 1 to the heating member.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a product packaging method (heat-seal packaging method) using a heat-fusible synthetic resin sheet for packaging sanitary napkins.

O Conventional technology and its problems In the conventional heat-seal packaging method, products (e.g. napkins) are packaged with an exterior synthetic resin sheet (thermal adhesive sheet).
After the upper and lower facing synthetic resin sheets are heated from the outside using a heating element, they are fused to each other.

In order to perform thermal bonding, it is necessary to heat the heating element to a temperature higher than the melting point of the sheet. As a result, a portion of the molten synthetic resin sheet adheres to the heating element, and it is necessary to remove the synthetic resin sheet adhered to the heating element every time the work is completed, which increases packaging costs due to the additional work. There is.

Another method to avoid this problem is to use a laminated film of two types of synthetic resins with different melting points as a packaging material, but this method simply laminates the low melting point resin over the entire surface, which is necessary only for the fused part. Therefore, there is a problem that resources are wasted and the cost of the packaging material is high, increasing the product cost.

○Means for solving the above-mentioned problems The present invention improves the heat sealing process in a sanitary napkin packaging machine, and heat-bonds a synthetic resin film packaging sheet at a desired predetermined location. On the other hand, there is a process of laminating an adhesive layer with a low melting point to form an exterior sheet, and a process of wrapping the packaged product with the exterior sheet with the adhesive layer inside, so that the adhesive layer of the exterior sheet above the product is The process of bringing the fusing layer of the outer sheet below the product into contact with each other, and heating the outer sheet at a temperature lower than the melting point of the packaging material sheet and higher than the melting point of the fusion bond, using a heating member brought into contact with the outer surface of the packaging material sheet. Then, by the step of fusing the opposing fusing layers to each other, the product is placed inside and the opposing outer sheets are thermally bonded to each other, and the heating member ＼ is prevented from adhering to the surface of the packaging material sheet due to melting.

O Example The following will explain the embodiments shown in the drawings.

In carrying out the present invention, as shown in FIG. 2, in the pre-heat sealing step, a low melting point fusion layer 2 is laminated at a predetermined location of the packaging material sheet 1. For example, a high melting point (150° C.) packaging material sheet 1
and a low melting point (120°C) polypropylene adhesive layer 2.
The exterior sheet B
However, in the embodiment shown in FIG.
For high melting point (150°C) polyethylene sheet 1,
Polypropylene with a low melting point (120°C) is dissolved in a solution and then applied using a coating mechanism (printing roll type).

(brush coating method using a marking sheet, etc.) 3 to coat a predetermined area (for example, the shaded area in Figure 2), and then pass through a drying device 174 to dry the polypropylene coating layer, as shown in Figure 2. A fusion layer 2 is formed as shown in FIG.

The sanitary napkin A, which is a packaged product supplied by the product supply device 5 of FIG. 1, is placed at a predetermined position on the outer sheet B as shown in FIG.

Thereafter, by the folding mechanism 6 shown in FIG. 1, both side edges of the outer sheet B are placed over the napkin A as shown in FIG. 3, so that the napkin is wrapped in the folded outer sheet B.

In the above state, the fusion layer 2 of the upper exterior sheet B is sandwiched between the upper exterior sheet B and the lower exterior sheet B.

Next, by passing through the heat sealing mechanism 7 shown in FIG. At this time, the temperature of the heating member 8 is set to a high melting point (150″), which is the melting point of the packaging material sheet 1.
C) and the melting point of the melting layer 2 (120° C.).

As a result, the facing adhesive layers 2 are melted together and used as an adhesive for the packaging material sheet, but since the packaging material sheet 1 is not melted, the melted packaging material sheet 1 adheres to the heating member 8 as in the conventional device. Never.

In the heat sealing process, after being heated by the heating member 8,
Pressure is applied by the pressure welding device 9 to bond the vertically overlapped seams of the upper and lower exterior sheets B to each other. Thereafter, the fused layers facing each other at the front and back of the sanitary napkin are cut into predetermined lengths at the same time as the front and back of the sanitary napkin are cut into predetermined lengths using a cutting means attached to the heat-sealing mechanism 7. Complete the product.

As shown in FIG. 5, the folding mechanism 6 in the first embodiment described above can be omitted by also supplying the exterior sheet B from above the product. It becomes necessary.

In this case, the adhesive layer 2 is formed around the product at a predetermined interval as shown in FIG. 6, and the packaged product has adhesive points on all four sides as shown in FIG. 7.

Effects of the Invention The present invention has the effect of making it possible to thermally bond exterior sheets without causing fusion of the exterior sheets during heat sealing in a napkin packaging machine, thereby facilitating maintenance work of the heat sealing mechanism.

In addition, by selecting the location where the adhesive layer is laminated, it is possible to heat-seal only the necessary locations that can be selected arbitrarily, and by forming the adhesive layer at the required locations, the exterior sheet can be formed into two layers with different melting points. It has the effect of reducing the cost of exterior materials compared to the conventional technology, which is constructed from a synthetic resin film and has a double-layer structure even in unnecessary parts.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an example of an apparatus for carrying out the heat seal packaging method of the present invention. Figure 2 shows the state in which the packaged product is placed on the exterior sheet in the packaging process, where figure a is a plan view and figure b is a 8 figure 5 t.
Figure 0 is a vertical cross-sectional view taken along the line -3l, and Figure 8 is a vertical cross-sectional view taken along the line 82-82 in Figure 8. 3A and 3B are a plan view and a longitudinal sectional view taken along the line 33-33 in FIG. 8, respectively, with the exterior sheet folded and packaged. FIG. 4 is a perspective view of the heat-sealed and packaged product. 5 to 7 show a second embodiment of the present invention;
The figure is a schematic diagram similar to Figure 1. ABC in Figure 6 is the third
A plan view, a vertical cross-sectional view, and a vertical cross-sectional view corresponding to abc in the figure. FIG. 7 is a perspective view similar to FIG. 4. A... Napkin B... Exterior sheet... Packaging material sheet 2... Adhesive layer Applicant: Mizuhiko Co., Ltd. ---1

Claims (2)

[Claims] (1) A roll of a packaging material sheet of synthetic resin film used for sanitary napkin packaging is rolled out, and a fusion layer made of a synthetic resin having a melting point lower than that of the packaging material sheet is laminated on a predetermined location where heat bonding is desired. a process of continuously stacking sanitary napkins in the center of the area surrounded by the adhesive layer laminated on the continuous exterior sheet; and forming an exterior with the adhesive layer inside. Both edges of the sheets are rolled up and the stacked sanitary napkins are stacked almost on their center lines, so that both edges of the sheets sandwich the adhesive layer between them in the longitudinal direction.
In addition, in the horizontal direction, there is a step in which the adhesive layers are made to face each other at the front and rear ends of the sanitary napkin, and in the longitudinal direction, in the folded seam, a heating member that is brought into contact with the outer surface of the packaging material sheet is moved relative to each other in the direction of the folded seam. A step of heating the outer sheet at a temperature lower than the melting point of the packaging material sheet and higher than the melting point of the adhesive layer by moving the material sheet to fuse the overlapped seams, and a process of melting the facing adhesive layers at the front and rear ends of the sanitary napkin to the outside. heating and fusing the packaging material sheet to a temperature where only the fusing layer melts, and simultaneously cutting the sanitary napkin at the center of the welded part to complete the packaging of the individually divided sanitary napkins. A heat seal packaging method for sanitary napkin packaging machines. (2) In the process of packaging sanitary napkins, a single exterior sheet is used, the product is placed with the adhesive layer on the inside, and then the product is folded in half and laminated around the periphery of the exterior sheet. 2. The heat-seal packaging method in a sanitary napkin packaging machine according to claim 1, wherein the adhesive layers are placed in upper and lower positions facing each other.