JPH07156980A - Unfolded sheet of container for hot-melt adhesive - Google Patents

Abstract

PURPOSE:To obtain an unfolded sheet of a container for a hot-melt adhesive which is easy to handle in the packing and moreover reusable. CONSTITUTION:The subject relates to an unfolded sheet 10 consisting of a foamed sheet of polyethylene terephthalate and cut to a shape enabling the sheet to be formed into a box-shaped container by folding. Folding lines 11, 12 are impressed on the unfolded sheet as required. The unfolded sheet can easily be formed into a box by pushing it into a filling jig for hot-melt adhesive and simplifies the filling operation. It is easy to unseal the box and release the hot-melt adhesive therefrom and it is avoided that bits of the packing material enter the hot-melt adhesive in the molten state. This container is reusable and contributes to lowering the cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a development sheet for a container for hot-melt adhesives, and particularly, it can be easily folded into the shape of the container, and once the container is filled with the hot-melt adhesive, The present invention relates to a development sheet for a container for hot-melt adhesives, which can function as an outer box as it is and can be placed on a distribution channel, and can also easily take out the hot-melt adhesive from the container.

[0002]

2. Description of the Related Art Hot melt type adhesives are solid at room temperature and become liquid by heating at about 120 ° C. to 180 ° C. When they are applied in a molten state on the surfaces to be adhered and cooled, they solidify rapidly for a few seconds. It is easy to handle because it does not contain any solvent and is widely used in many fields.

Since the hot-melt adhesive is solid at room temperature, the physical distribution at the time of delivery to the customer is easier than that of the liquid adhesive. At the time of distribution, in the factory, first, the release paper for packaging is placed in the filling jig having a predetermined capacity by folding it manually or by an automatic folding machine, and it is heated and melted in the folded release paper for packaging. The hot melt adhesive in a state is poured, and it is cooled and solidified. The solidified hot melt adhesive is taken out from the filling jig while being wrapped with the release paper for packaging. Since the release paper is thin and does not have the strength to withstand external obstacles during distribution,
A plurality of hot-melt type adhesives wrapped with release paper are loaded one by one on an outer cardboard box or the like, and in that state, they are put on a distribution channel and delivered to a consumer side.

When the hot melt adhesive is used in the customer, take it out from the outer cardboard box,
The release paper is opened, the hot-melt adhesive is taken out, heated and melted, and the removed release paper is discarded.

[0005]

As described above, the hot-melt adhesive has the release paper folded and placed in the filling jig before the hot-melt adhesive is placed on the flow path, and the hot-melt adhesive melted therein. A step of melting and wrapping the mold adhesive is required, and especially in the case of manual work, the work of correctly folding and arranging the mold release paper for packing so that the melted hot melt adhesive does not leak It requires a lot of work. When an automatic folding machine is used, such inconvenience is solved to some extent, but since the device itself is complicated, maintenance is not easy and it is expensive, so there is a cost problem. Further, in order to ensure safety during distribution, it is necessary to re-pack it in a cardboard box or the like for exterior use, which also requires considerable labor.

Further, the operation of removing the release paper from the solidified hot-melt type adhesive during use requires caution. If the peeling operation is performed roughly, the release paper is damaged and a part of the release paper remains on the hot melt adhesive side, and the release paper may mix into the melted hot melt adhesive. The present invention aims to eliminate the inconvenience associated with the packaging required at the time of distribution of the current hot-melt type adhesive, and more specifically, in a filling jig in a simple process. A hot-melt adhesive that can be placed and can be placed in a distribution channel as it is after being filled with a molten hot-melt adhesive, that is, without the need to repack it in a cardboard container for exterior packaging. The purpose is to provide a development sheet for a container. Still another object of the present invention is to heat and melt the solidified hot-melt adhesive as packaged in the container together with the container, if necessary, so that the container is easily melted from the hot-melt adhesive. It is an object of the present invention to provide a development sheet for a hot-melt adhesive container that can be separated and can be reused.

[0007]

In order to solve the above problems and to achieve the object, the present inventors have a heat resistance and strength capable of encapsulating a hot melt adhesive in a molten state, and We have conducted many experiments and studies on packaging materials that can be solidified as they are, and in the process, polyethylene terephthalate foam sheets have a certain releasability and required adhesiveness to solidified hot-melt adhesives. That the release property can be further improved by laminating a crystalline polyethylene terephthalate film on the surface of the polyethylene terephthalate foam sheet,
Furthermore, the heat resistance temperature is also increased by increasing the crystallinity, and is 120 ° C., which is the melting temperature of the hot melt adhesive.
It was perceived that a material having sufficient heat resistance can be easily obtained at a temperature of about 180 ° C.

The present invention is based on the above perception, and is basically a polyethylene terephthalate foam sheet as a raw material, which is a development sheet cut into a shape that can be folded into a box-shaped container. Disclosed is a development sheet for a hot-melt adhesive container, characterized in that required folding lines are formed on the sheet. The polyethylene terephthalate foam sheet as a material preferably has a thickness of about 0.5 mm to 2 mm. In the case of a sheet thinner than 0.5 mm, the strength is insufficient and there is a risk of breakage, and the thermal resistance to the molten hot melt type adhesive may be insufficient in some cases. If the sheet is thicker than 2 mm, it will be difficult to fold it into a box-shaped container as described later. A foaming ratio of about 4 to 5 is used. It has a proper rigidity, adiabatic property, and a crystallization acceleration rate.

If necessary, a crystalline polyethylene terephthalate film is laminated on the surface of the polyethylene terephthalate foamed sheet which is the inner side of the hot melt type adhesive when it is packaged, for the purpose of enhancing releasability. If necessary, various silicon coatings may be applied on the film. Further, various silicone coatings may be directly applied to the polyethylene terephthalate foam sheet. The reason why such laminating or coating is not essential will be described later.

[0010]

EXAMPLES A spread sheet for a container for hot-melt adhesive according to the present invention will be described in detail below with reference to examples. FIG. 1 is a plan view showing an embodiment of a development sheet for a hot-melt adhesive container according to the present invention. From a raw material of a polyethylene terephthalate foamed sheet having a required thickness and a foaming ratio (which may be laminated with a crystalline polyethylene terephthalate film or silicon coating as described above), a container for a hot-melt adhesive according to the present invention is prepared. The development sheet is cut. The cutting means is optional and may be punching. The required folding lines are formed so that a box-shaped container can be obtained by folding after cutting or at the same time as cutting. The example of FIG. 1 is a development sheet for a rectangular box-shaped container with a lid, and the development sheet 10 has a folding line (shown by a solid line) for valley folding 1 as shown in the figure.
1 and folding line for mountain folding (shown by a chain double-dashed line) 12
Is formed.

It is well known that a polyethylene terephthalate foamed sheet has a certain degree of rigidity and hinge characteristics (a characteristic that it can be restored again without being broken by bending).
Therefore, the unfolding of the unfolding sheet 10 is performed by placing the unfolding sheet on the cavity opening surface of the filling jig (not shown) that has been used for packaging the conventional hot melt adhesive, and forming the bottom surface after folding. By pushing 15 into the cavity manually or by an appropriate pushing means, it is gradually folded in the pushing process (Fig. 2), and finally in the cavity of the filling jig as shown in Fig. 3. It will be readily appreciated that it can be in the form of a mold container 20. It will also be appreciated that when the folded container is removed from the cavity, it can be opened to some extent due to the resilience of the material.

Next, the process of packaging the hot-melt type adhesive using the above-mentioned spreading sheet, transferring it to the user, and melting the hot-melt type adhesive to use by the user, explain. After pushing the development sheet 10 of the container made of the polyethylene terephthalate foamed sheet into the cavity of the filling jig to form a box-shaped container 20 (a state in which the upper lids 13 and 14 in FIG. 3 are opened),
The molten hot-melt adhesive is filled in the container, and after closing the lid (state of FIG. 3), it is cooled to solidify the hot-melt adhesive. As described above, the polyethylene terephthalate foamed sheet and the solidified hot-melt adhesive have some releasability and at the same time some adhesiveness. Therefore, the spread sheet folded by the solidification of the hot-melt adhesive and the hot-melt adhesive are in an integrated state. Then, it is taken out from the filling jig in that state.

The solidified hot-melt adhesive and the inner surface of the polyethylene terephthalate foam sheet are bonded to each other so that they do not separate spontaneously even when taken out from the filling jig (that is, the restoration of the material has). It does not spread again by force), and the polyethylene terephthalate foam sheet is maintained in a state in which the solidified hot melt adhesive is packaged in a square shape. Therefore, the container will not be opened even if it is placed in the distribution channel as it is, and since the polyethylene terephthalate foamed sheet has elasticity and shear strength to some extent, it is possible to avoid damage in the distribution process. Of course, if necessary, a plurality of them may be contained in an appropriate bag or container and placed on the distribution channel, but even in that case, the bag or container may be made of an inexpensive synthetic resin as long as the situation is not damaged. A bag or the like can be used.

When using the hot melt type adhesive,
The container is opened and the packaged hot melt adhesive is taken out. The polyethylene terephthalate foam sheet, which is the material of the container, has releasability for the hot melt adhesive and at the same time has sufficient shear strength, so even if the unsealing work is performed randomly It is possible to avoid that the part of the container breaks and remains on the hot melt adhesive side due to breakage. In some cases, the hot-melt adhesive as packaged may be put into an appropriate melting container to heat-melt the hot-melt adhesive. Upon melting, the hot melt adhesive and the material of the container are naturally separated. As described above, since the polyethylene terephthalate foam sheet, which is the container material, has sufficient resistance to the melting temperature of the hot melt adhesive, the polyethylene terephthalate foam sheet is neither deformed nor separated, and is appropriately separated. By this means, the container in a developed state can be easily taken out from the molten hot melt adhesive solution. If necessary, the container can be reused.

As described above, the polyethylene terephthalate foamed sheet can have a higher heat resistant temperature by changing the crystallinity. Therefore, it is a preferred embodiment that the polyethylene terephthalate foam sheet used in the present invention is previously subjected to a treatment for increasing the crystallinity (for example, a heat setting treatment). However, even a sheet not subjected to such treatment can be effectively used. The reason for this is that after the development sheet 10 is pushed into the filling jig, the molten hot melt adhesive is filled, and the heat of the molten hot melt adhesive itself causes the crystallinity to progress. Heat resistance is improved.

Further, as described above, the polyethylene terephthalate foamed sheet has some releasability from the hot-melt type adhesive solidified by itself. Therefore, it can be used as a container material without any treatment for improving the releasability, but it is also possible to laminate a crystalline polyethylene terephthalate film as described above on the film, if necessary. By performing a silicone coating or directly coating a polyethylene terephthalate foam sheet with a silicone, the releasability from the solidified hot melt adhesive can be further enhanced. In the case where the hot-melt adhesive is melted while it is still packaged in the container as described above, such a treatment for enhancing the releasability is completely unnecessary.

In the development sheet for the container for hot-melt adhesive according to the present invention, the shape of the container to be folded is arbitrary, and is usually the shape of the internal cavity of the conventionally used filling jig as described above. . There is also no particular limitation on the shape of the expansion sheet and the shape of the folding line formed therefor to obtain a container of such a shape, the point is that when the container is pushed into the internal cavity of the filling jig, It is arbitrary as long as it has a shape. FIG. 4 shows another embodiment of the unfolding sheet in which a rectangular box can be obtained by folding, and in this example, the necessary folding lines are formed only by valley folding.

[0018]

EFFECTS OF THE INVENTION As described above, a polyethylene terephthalate foamed sheet is used as a material to form a development sheet for a container for hot-melt adhesives, so that a container for packaging hot-melt adhesives is provided in a filling jig. Is easy to arrange, and the packaging work is simplified. Further, the hot-melt adhesive contained in the container can be put on the distribution channel as it is, and re-packing is not required.
It is easy to open the package, and it is possible to prevent the packaging material from entering the molten hot-melt adhesive. It can be reused and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a development sheet of a container for hot-melt adhesive according to the present invention.

FIG. 2 is a diagram illustrating a folded state of a development sheet.

FIG. 3 is a view showing a state of being folded into a box shape.

FIG. 4 is a plan view showing another embodiment of the development sheet of the hot melt adhesive container.

[Explanation of symbols]

10 ... Development sheet of hot-melt adhesive container, 11
… Valley fold line, 12… Mountain fold line, 15… Bottom part

Claims (2)

[Claims] 1. A polyethylene terephthalate foam sheet as a material, which is a development sheet cut into a shape that can be folded to form a box-shaped container, and the development sheet has a required folding line. A development sheet for a hot-melt adhesive container featuring 2. The hot melt according to claim 1, wherein a crystalline polyethylene terephthalate film is laminated on a surface which becomes an inner side when folded, and a silicon coating is further applied on the film if necessary. Development sheet of mold adhesive container.