JPH0450179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a synthetic resin sheet welding method and a container made of a synthetic resin sheet in which a lid is welded to a container body by this welding method.

(Prior Art) Conventionally, there have been containers made of synthetic resin such as vinyl chloride resin formed into sheet shapes and molded into various shapes to accommodate various articles. These containers are often used to store food because they are easy to mold, inexpensive, easy to handle, and hygienic.

Normally, when using these containers, after putting food or other items into the container body, cover the container to prevent foreign objects from entering the container. Conventional containers made of synthetic resin sheets include those in which the container body and lid are separate bodies, and those in which the lid is connected to the edge of the container body and the edge can be bent to form a lid. etc.

Conventionally, when putting lids on these containers,
The flange provided on the container body and the flange provided on the lid may be overlapped and fastened together with a stapler (trademark), or the flange may be provided with an uneven engagement portion, and the flange on the container body and the flange on the lid may be engaged by engaging the flange with the unevenness. Or, the flanges are overlapped and heat welded.

(Problems to be Solved by the Invention) A major advantage of conventional containers made of synthetic resin sheets is that they are easy to handle, but with the conventional lid bonding method as described above, when opening the lid, The problem is that it is very difficult to handle.

In other words, when the flange of the container body and the flange of the lid are welded using Staple (trademark) or heat welding, the lid is strongly bonded, so it requires a considerable amount of force to open the lid, and it is difficult to open the lid. I can't open it. Furthermore, when opening the lid, the synthetic resin sheet container may tear or the stored items may lose their shape. Therefore, there has been a demand for containers made of synthetic resin sheets that are easy to handle and that can be easily closed and opened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its purpose is to easily attach a lid to a container made of a synthetic resin sheet with a predetermined strength. To provide a method for welding a synthetic resin sheet that can be easily removed from a container body, and to provide a container made of a synthetic resin sheet.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration.

That is, by stacking a plurality of synthetic resin sheets, a hot rod heated to a temperature at which the synthetic resin sheets melt is introduced into the synthetic resin sheet from one side, penetrated, and then returned to the other side and pulled out. , characterized in that a through hole is bored in a synthetic resin sheet and a synthetic resin sheet is welded to the peripheral edge of the through hole, and a flange provided on a lid of a container formed of a synthetic resin sheet. , by overlapping the flanges of the container body, and inserting a hot rod heated to a temperature that melts the synthetic resin sheet from one side of the overlapping flanges to penetrate them, and then returning to the other side and pulling them out. , a through hole is formed in the flange of the container body and the flange of the lid, and the flange of the container body and the flange of the lid are welded at the peripheral edge of the through hole.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of a synthetic resin sheet container in which a lid is adhered to a container body using the synthetic resin sheet welding method according to the present invention.

In the figure, 10 is a container body, which is formed from a synthetic resin sheet into a substantially rectangular box shape. Reference numeral 12 denotes a main body flange provided so as to protrude outward by a predetermined width from the opening side edge of the container main body 10.
14 is a lid that covers the container body 10, and 16 is a lid flange provided on the peripheral edge of the lid 14 on the opening side. 20 is a welding portion for welding the main body flange 12 and the lid flange 16 together. The welding parts 20 are parts for melting and welding the main body flange 12 and the lid flange 16, and are provided in an appropriate number at predetermined intervals on the flange part.

FIG. 2 is a perspective view of the synthetic resin sheet container before the lid 14 and container body 10 are bonded together. As shown in the figure, in the container of this embodiment, one edge of the lid 14 is connected to the edge 22 of the container body 10, and after storing the stored items in the container body 10, the lid 14 and the container body 10 are connected. Bend it at the main body flange 12.
and lid flange 14 are overlapped and welded.

Next, a method for welding the flange portion of the container described above will be explained.

Figure 3 shows the main body flange 12 and the lid flange 1.
FIG. 6 is a perspective view showing a method of welding the two parts. 2 in figure
Reference numeral 4 denotes a round heating rod, and the tip of this heating rod 24 is sharpened into a needle shape. The main body flange 12
When welding the lid flange 16, the heating rod 24 is kept at an appropriate temperature to melt the lid flange 16 and the main body flange 12, and the main body flange 12 is welded as shown in the figure.
and the lid flange 16 are overlapped and fixed, and the hot rod 24 is inserted into the lid flange 16 from above the lid flange 16.
and penetrate the main body flange 12. The hot rod 24 melts the lid flange 16 and the main body flange 12 while melting the lid flange 16 and the main body flange 1.
2 and penetrate it. In the example, the width of the main body flange 12 and the lid flange 16 is approximately 1 cm.
The heating rod 24 used has a diameter of about 2 mm.

After the heating rod 24 is passed through the lid flange 16 and the main body flange 12, the heating rod 24 is pulled upward again. As a result, the lid flange 16
A circular through hole is left in the main body flange 12, and the lid flange 1 is left at the circular periphery.
6 and the main body flange 12 are melted and welded together.

FIGS. 4a and 4b are a plan view and a sectional view showing the welded portion 20 in an enlarged manner. In FIG. 4a, 26 is the lid flange 16 which is penetrated by the heating rod 24.
and a through hole formed in the main body flange 12, and 28 is a fused portion formed at the peripheral edge of the through hole 26. In this example, a heating rod 2 with a diameter of about 2 mm is used.
4, a through hole 26 with a diameter of about 2 mm is bored. The melting part 28 is a part where the synthetic resin sheet forming the lid flange 16 and the main body flange 12 is melted by a hot rod 24 and fixed to the peripheral edge of the through hole 26, and the lid flange 16 and the main body flange 12 are bonded together. be. As shown in FIG. 4b, a melted portion 28 formed at the peripheral edge of the through hole 26
In this case, the molten resin of the lid flange 16 and the main body flange 12 adheres to the wall surface of the through hole 26, and the lid flange 16
and the main body flange 12 are bonded together. As mentioned above, the hot rod 24 enters from above and is pulled out again upwards, so during this reciprocating movement, the hot rod 24
4, the lid flange 16, and the main body flange 12 are melted together, and a through hole 26 is formed as shown in FIG. 4b.
It is fixed to the wall of the wall. After the hot rod 24 penetrates, it is pulled upward, so the molten resin on the main body flange 12 and the molten resin on the lid flange 16 overlap and stick together, causing the lid flange 16 and the main body flange 1 to overlap.
2 are bonded together. At the upper surface of the lid flange 16 of the melting section 28, when the hot rod 24 is pulled out, a portion of the molten resin protrudes somewhat in the pulling direction. The fused portion 28 does not protrude much from the lower surface of the main body flange 12.

The feature of the method of bonding the lid flange 16 and the main body flange 12 described above is that the heated small-diameter hot rod 24 is passed through the main body flange 12 and the lid flange 16 and reciprocated, whereby the lid flange 16 and the synthetic resin sheet of the main body flange 12 are fused together to generate adhesive force. The resin in the melted portions 28 of the main body flange 12 and the lid flange 16 are integrally connected within the through hole 26 to form a hook-like adhesive action. In order to be welded in this manner, it is necessary to maintain the heating rod 24 at a temperature that causes the molten resin to have a certain degree of stickiness when the synthetic resin sheet is melted by the heating rod 24.

Since an appropriate number of the above-mentioned welding parts 20 can be provided depending on the strength with which the lid 14 is bonded to the container body 10, an appropriate number of welding parts 20 may be provided depending on the required bonding strength.

When opening the lid of the container that has been bonded as described above, the welded part 20 is connected to the lid flange 16 and the main body flange 1 by the small ring-shaped welded part 28.
Since the lid 14 is simply joined to the lid 14, the lid 14 can be easily opened by simply holding the flange and pulling it apart. In fact, since the adhesive strength of each of the welded parts 20 is not so strong, the welded parts 20 can be easily separated by applying a weak force when separating them.

When adhering the lid 14 more strongly, the number of welded parts 20 may be increased, but in this case as well, the lid 14 can be easily opened by sequentially separating the welded parts 20.

In this way, according to the above-described bonding method, since the lid 14 is bonded using the small ring-shaped fused portion 28, the strength with which the lid 14 is bonded is appropriate and the lid can be opened easily. By this,
Since no extra force is applied when opening the lid, even if the container contains items that may lose their shape, the lid can be opened without damaging the stored items. No tools are required.

The method of welding synthetic resin sheets described above can be used for all containers made of synthetic resin sheets that can be thermally welded, and is not particularly limited to the shape of the container. It is also possible to provide a plurality of heating rods to form a plurality of welds on the container at one time. Moreover, the shape of the heating rod 24 may be other than a round rod, such as a cross or a triangular cross section.

(Effects of the Invention) According to the present invention, as described above, the lid can be welded by an extremely simple method of penetrating the flange portion of the container with a heating rod. In addition, since the adhesive strength of the welded part of the flange is not excessively strong, the lid can be opened simply by separating the flange part and removing the hook, making it possible to provide an extremely easy-to-use container. Effective.

The present invention has been variously explained below with reference to preferred embodiments, but the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the present invention. It is about.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a synthetic resin sheet container according to the present invention, FIG. 2 is a perspective view of the container before being covered with a lid, and FIG. Figures 4a and 4b are a plan view and a sectional view showing the welded portion. 10...Container body, 12...Body flange, 1
4... Lid, 16... Lid flange, 20... Welded part, 22... Edge, 24... Hot rod, 26... Through hole, 28... Melted part.

Claims (1)

[Claims] 1. A plurality of synthetic resin sheets are stacked, a hot rod heated to a temperature at which the synthetic resin sheets melt is introduced into the synthetic resin sheet from one side, penetrated through the synthetic resin sheet, and then By putting it back and pulling it out,
1. A method for welding synthetic resin sheets, which comprises drilling holes in a synthetic resin sheet and welding the synthetic resin sheet around the periphery of the holes. 2 A flange provided on the lid of a container formed of a synthetic resin sheet and a flange of the container body are overlapped, and a hot rod heated to a temperature that melts the synthetic resin sheet is applied to one of the overlapped flanges. By entering from the side and penetrating it, and then returning to one side and pulling it out, a through hole is made in the flange of the container body and the flange of the lid, and
A synthetic resin sheet container characterized in that the flange of the container body and the flange of the lid are welded to each other at the peripheral edge of the through hole.