JPH07276288A - Method and device for removing electricity in trimming process - Google Patents

Abstract

PURPOSE:To conduct quickly and effectively the electricity removal of electrified matters by introducing ionized air into the lower part space of stamped out formation bodies at the automatic stamping out trimming process of a plastic continuation thermal formation body. CONSTITUTION:A continuation formation body 3 is stamped out by the up and down movement of each upper stamping out edge 2 fitted to an upper press table 1 in co-work with each lower stamping out edge 5 fitted to a lower press table 6, and is taken out as formation articles 4. These formation articles 4 fall downward, and are accumulated on an accumulation table 10 as a formation article accumulation mountain 9. As static electricity generated at the time of formation article 4 stamping out and at the time of articles 4 being accumulated at the accumulation mountain 9, each ionized air generator 7 is provided, for example, at each lower press main body 8 in order to prevent it, and static electricity that has electrified the formation articles 4 and the formation article accumulation mountain 9 is removed by blowing out ionized air 11 from each generator 7. As a result, the defective accumulation of the formation articles 4 due to electrification repulsion operation is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous plastic thermoformed product (hereinafter abbreviated as a continuous formed product) obtained by continuously vacuum- or pressure-forming a continuous film or sheet-like product containing plastic as a main material. The present invention relates to an automatic punching trimming process (hereinafter abbreviated as a trimming process) and an apparatus (hereinafter abbreviated as a trimming device), and more particularly, to a static elimination method and a trimming device with a static elimination function in the trimming process.

[0002]

2. Description of the Related Art A contact or non-contact type static eliminator bar, an ionized air blower or the like for static eliminating static electricity in a simple transfer process of a continuous film or sheet-like material mainly made of plastic, or a molded product. It has been known that has been used. However, an effective static elimination method or device in the trimming step of the continuous molded body has not been disclosed yet.

[0003]

The inventors of the present invention have studied in detail the trimming process of a continuous molded product, and as a result, have found that even if the charge is sufficiently removed by punching and trimming the continuous molded product, the In the process of punching into the body, dropping them, and further accumulating, each molded body in each process is charged with static electricity, and due to the repulsive action of the charged objects, the punched molded bodies do not accumulate well and the punching position shifts. I figured out what to do. The present invention is a result obtained based on such research results, and presents a method and an apparatus for rapidly and effectively removing static electricity of a charged object in a trimming process of a continuous molded body.

[0004]

SUMMARY OF THE INVENTION One of the present inventions is a method for removing static electricity in a trimming step, which is characterized in that ionized air is introduced into a lower space of a punched article in the trimming step of a continuous article. Another aspect of the present invention is
This is a trimming device with a static elimination function, which is characterized in that an ionized air generating device is opposed to a lower press body in a trimming device for a continuous molded body, and is attached.

In the present invention, as a method for introducing the ionized air into the lower space of the punched body, a method of blowing the ionized air from both side surfaces of the lower press body of the trimming device and a pipe of the ionized air from the ionized air generator. There are various methods such as the method of introducing with, the method of attaching an ionizing air generator to the lower press body,
As a method of rapidly and effectively eliminating static electricity with as little ionized air as possible, a method of attaching an ionized air generator to the lower press body so as to face it is suitable.

[0006]

In FIG. 1, the continuous molded body (3) has a lower punching blade (5) attached to the lower press table (6) by the vertical movement of the upper punching blade (2) attached to the upper press table (1). ), It is punched out to form a molded product (4).
The molded product (4) drops downward and is stacked on the stacking table (10) to form a molded product stacking pile (9). Static electricity is generated when the molded product (4) is punched out and piled up on the molded product accumulation pile (9). The static electricity charged in the molded product (4) and the molded product pile (9) is removed by the ionized air (11) from the ionized air generator (7). By doing so, defective integration of the molded product (4) due to the electrostatic repulsion action is prevented. At the same time, since the repulsive action between the subsequent stamped compact (12) and the pile (9) does not occur, the displacement of the compact (12) does not occur. Therefore, defective pull-out is also prevented.

[0007]

[Example] The trimming device of FIG. 1 was used with an ionizing air discharge bar (7) as an ionizing air generating device (7) for removing static electricity, and a drawing ratio of 1.5 (the ratio of the depth of each molded product to the frontage). The continuous molding of the polystyrene sheet of 1) was automatically punched and trimmed. The electrification amount of the accumulated pile (9) of molded products was almost 0 KV, and the defective rate due to static electricity in the trimming process was 0%.

Comparative Example Automatic punching and trimming was carried out under the same conditions as in the Example except that the ionization air generator (7) for removing static electricity was not attached. The amount of charge on the pile of molded products (9) is about 50K.
V, and the defective rate due to static electricity was about 15%.

[0009]

As described above, the present invention is provided with a mechanism for effectively removing static electricity generated when punching and accumulating a continuous molded body with a trimming device. Therefore, the punched molded body, the punched molded product, Also, the repulsive action due to the electrification between the integrated molded products can be eliminated, and the occurrence of machine stoppages and defects in the trimming process can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a side view of essential parts of a trimming process and an apparatus.

[Explanation of symbols]

 1 Press table 2 Upper punching blade 3 Continuous molded body 4 Molded product after punching and falling 5 Lower punching blade 6 Lower press table 7 Ionizing air generator for static electricity removal 8 Lower press body 9 Molded product stacking pile 10 Integrated table 11 Ionization Air 12 Position image of punched product 13 Lower space

Claims (2)

[Claims] 1. A static elimination method for a trimming step, which comprises introducing ionized air into a lower space of a punched body in the automatic punching trimming step for a continuous plastic thermoformed body. 2. A trimming device with a static elimination function, characterized in that in an automatic punching trimming device for a continuous plastic thermoformed body, an ionizing air generator is attached to the lower press body so as to face it.