JPH0241211A - Manufacturing method for synthetic resin containers - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a bag container for storing small articles, that is, a container made of a thermoplastic synthetic resin, by finishing the edge of the container by welding and cutting. The present invention relates to a method for manufacturing.

[Conventional technology]

-a, a pack container for storing small items such as a toothbrush is formed by welding and cutting the case body made of thermoplastic synthetic resin and the cover, but in the case of this container, the welded and cut edges are generally Sharp edges called sharp edges are formed, and especially when hard thermoplastic synthetic resin materials are used, when you hold or touch these edges, you may feel pain in your hands, and sometimes your hands may be injured. Something happened.

For this reason, conventional methods have been to use soft thermoplastic synthetic resin materials that do not damage the hands, to take measures to manage the cutting conditions during cutting to avoid burrs, or to use a file to remove burrs. Countermeasures such as polishing and finishing were forced to be taken.

[Problem to be solved by the invention]

Containers made from conventional soft materials are difficult to mold, have no stiffness and tend to wrinkle on flat surfaces, and are prone to blocking due to the influence of plasticizers, which poses quality problems and reduces product value. However, when using hard materials, the welded and cut edges cannot be perfectly rounded.
In addition to the cumbersome management of the cutter blade, the polishing process generates abrasive powder that is difficult to clean and does not improve productivity, which is a problem in any case.

The present invention seeks to eliminate these conventional disadvantages by using thermoplastic materials with rounded edges that do not cause pain or injury to the hands when the container is held in the hand. The purpose is to provide a simple manufacturing method that can produce containers made of synthetic resin.

[Means to solve the problem]

The present invention is a method of manufacturing a container by polymerizing, welding and cutting a case body made of a thermoplastic synthetic resin and a cover body made of a thermoplastic synthetic resin covering the case body, with the cut edges integrally joined. This is a method for manufacturing a synthetic resin container, characterized in that parts other than the edges are subjected to heat shielding a'' and rounded in a thermal deformation atmosphere of flame or hot air.

[For production]

In the method for manufacturing a synthetic resin container of the present invention, when the edge of a container made of thermoplastic synthetic resin formed by welding and cutting is heated and deformed to form a rounded edge, heat is applied to the container. In order not to affect parts other than the cut edges, the container is placed in a heat-shielded condition and sprayed with flame, hot air, or boiling water only on the edge of the container to soften the synthetic resin material and eliminate pars in a thermally deformed atmosphere. The edges are rounded to an appropriate degree, so that when you hold the container, the rounded edge of the container may come into contact with your hand and cause pain or injury to your hand. It can be used safely.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings as an example of a packaging container 2 for selling a toothbrush I. Both are made of thermoplastic synthetic resin, and the toothbrush 1 is hermetically housed inside to form a pack container. When the sheet-like member constituting the main body 3 and the member of the cover integral 4 formed in the shape of a container are overlapped, welded and cut using a high-frequency welder, and the cut edges are integrally joined to form the container 2, a container containing the toothbrush 1 is formed. 2, the edge 5 of the container 2 created by the fusing at this time has a sharp point as shown in FIG.

Therefore, when the edge 5 of this container 2 is integrally joined and rounded, the rounded edge is formed by thermally deforming the edge 5 in a thermally deforming atmosphere of flame or hot air with the other parts under a heat shielding condition. This is 5I.

In this case, the cover body 4 side of the container 2 is made of a nonflammable material.
For example, by fitting and holding the socket 7) 10 made of stainless steel, ceramics, or other heat insulating material, and further applying a nonflammable backing plate 11 to the case body 3 side, only the welded and cut edge 5 of the container is exposed and connected. The portion is rounded by blowing flame from the burner 13 or hot air from a hot air nozzle to form a rounded edge portion 51.

The welded and cut edge 5 of the container 2 is exposed and covered with a non-combustible heat insulating material, and while being transported by the conveyor chain 7, the edge 5 is passed through the thermal deformation atmosphere to remove the edge. It is sufficient to perform rounding, but it is also possible to round the cut edges at the same time as welding and cutting the container 2.

For example, hot air is blown onto the cut edge from a container simultaneous welding/cutting jig (not shown) to thermally deform the rounded edge 51;
Alternatively, the edge that is thermally deformed during the cutting operation using the welding cutting jig may be slowly brought into contact with the jig to form the rounded edge 51.

Further, the container 2 has a socket 10 fixed to a chain 7 that moves forward on the conveyor with a bracket 8, and moves forward on a guide rail 9. During this forward movement, the edge 5 is exposed to the flame sprayed from the burner 13. The rounded edges are rounded due to thermal deformation and wind pressure.5. For example, the deformed state of the edge 5 is
Although it varies depending on the heating temperature by the burner 13 or the hot air nozzle, the blowing pressure state, the blowing angle, etc., in terms of -S, for example, if the heating is about 100 degrees C, the edge 5
As shown in the figure, it is curved to form a round shape, and if heated to about 150 degrees Celsius, for example, it will melt and form a round shape as shown in FIG.

Furthermore, the socket 10 or the contact plate 11 can be easily reused while being moved by a conveyor and returned to the container by cooling means.
It is better to lower the temperature without causing any problems, and a treatment device that injects hot water from a nozzle instead of hot air can also be used.

〔Effect of the invention〕

The present invention is a method of manufacturing a container by polymerizing, welding and cutting a case body made of a thermoplastic synthetic resin and a cover body made of a thermoplastic synthetic resin covering the case body, with the cut edges integrally joined. In this process, the edges of the welded and cut thermoplastic synthetic resin container are properly parsed by rounding in a thermal deformation atmosphere of flame or hot air with the edges other than the edges shielded from heat. The container has a rounded edge and is safe when held in the hand without causing pain or injury to the hand. There is no generation of polishing powder due to the polished finish, and the rounding process is easy, the roundness is accurate, and cutting management is easy, which significantly increases productivity.
It is possible to process at low processing cost, and the packaging container has a good finish and has the advantage of greatly increasing the commercial value.

[Brief explanation of the drawing]

Fig. 1 is an explanatory sectional view showing the manufacturing method of the present invention, Fig. 2 is a perspective view of the container, Fig. 3 is a sectional view showing the processed edge, and Fig. 4 is an explanatory sectional view showing the manufacturing method of the present invention.
The figure is a cross-sectional view of another embodiment showing a processed edge, and FIG. 5 is a cross-sectional view showing a conventional edge.

Claims (5)

[Claims] (1) In a method of manufacturing a container by polymerizing, welding and cutting a case body made of a thermoplastic synthetic resin and a cover body made of a thermoplastic synthetic resin that coats the case body so that the cut edges are integrally joined. . A method for manufacturing a synthetic resin container, characterized in that rounding is performed in a heat deforming atmosphere of flame or hot air with parts other than the edges shielded from heat. (2) Claim 1, wherein the container is fitted and held in a socket made of a non-combustible material, only the welded and cut edges of the container are exposed, and the edges are rounded by blowing flame or hot air onto them.
Method for manufacturing the synthetic resin container described. (3) The welded and cut edge of the container is covered with a non-combustible heat insulating material in an exposed state, and while being transported, the edge is passed through a heat deformation atmosphere to undergo edge rounding. Manufacturing method for synthetic resin containers. (4) A method for manufacturing a synthetic resin container, characterized in that the cut edges are rounded during welding and cutting of the container. (5) The method for manufacturing a synthetic resin container according to claim 4, wherein hot air is blown onto the cut edge from the container welding/cutting jig to cause rounding and thermal deformation of the cut edge.