JP3169771B2 - Processing equipment for plastic moldings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing apparatus for cutting and fusing a plastic molded product. More specifically, for example, in a plastic film bag manufacturing apparatus, the film is pressed onto a mounting table with a processing blade. The present invention relates to an improvement in a processing device for performing fusion and cutting.

[0002]

2. Description of the Related Art Conventionally, for cutting and fusing (heat sealing) performed in, for example, film bag making, the cutting end of a running film is brought into contact with a heater such as a heated nichrome wire to melt and heat seal. In many cases, the film is mounted on a mounting table, and a welding blade and a cutting blade separately provided from above are simultaneously pressed.

In the former method using a nichrome wire, it is necessary to secure the running accuracy of the film in order to stabilize the shape of the fusing end, and a straight cut is sufficient, but a curved cut is difficult. In many cases, there is also a problem in the sealing strength of the heat sealing portion. With the latter means for pressing from above, it is difficult to adjust the height positions of the welding blade and the cutting blade, so that each is fixed to an integral holder, and a cartridge heater and a band heater are attached to the holder. Since the processing blade is indirectly heated by mounting the apparatus, there is a problem that the thermal efficiency is low and the apparatus becomes complicated and large.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to improve a fusion processing blade and a cutting processing blade in a processing apparatus for plastic molding to ensure the precision of fusing at the cut end of a plastic molded product. An object of the present invention is to provide a reasonable and efficient processing apparatus which has good thermal efficiency and satisfactory heat sealing strength.

[0005]

SUMMARY OF THE INVENTION The present invention provides at least two
In an apparatus for processing a plastic molded product consisting of two film-like objects, a processing blade is an integrated processing blade in which a fusion processing blade and a cutting processing blade are integrally formed, and the same body processing blade is a thin plate-shaped conductive blade. It is formed of a flat plate made of conductive metal and has a predetermined blade shape, curved blade, straight blade, wavy blade, mountain-shaped blade, two-sided blade, or three-sided blade, and has electrode terminals at both ends. It is fixed to a flat heat insulating plate, directly connected to the electric circuit, the integrated processing blade is directly supplied with power, and a thermocouple is arranged on the side of the central part of the same processing blade to directly measure the temperature of the processing blade The power supply is controlled.

[0006]

[Function] The cutting blade and the welding blade are integrally formed, and the temperature of the cutting blade is directly measured and the power supply is controlled to perform direct power supply heating, so that the heating efficiency is improved and the cutting is performed. And the fusion is stable, and a clean cutting of the end face and a sufficient sealing strength can be obtained. Controlling the source.

[0007]

Examples of the material of the plastic molded product applied in the present invention are thermoplastic resins having a melting point or a softening point, for example, olefin polymers such as polyethylene and polypropylene, copolymers of ethylene and vinyl acetate,
Polyvinyl chloride, vinylidene chloride copolymer, various nylons, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyvinyl alcohol,
Polystyrene, polycarbonate, ionomer resin,
Fluorinated copolymers and the like can be mentioned. These resins are molded products, and these molded products are generally in the form of a film or cloth and are often continuous, and may be in the form of a sheet if the thickness is about 1 mm or less. In the case of making a bag, a film-shaped material may be formed into a cylindrical shape, and the invention is applicable even when two or more film-shaped materials are stacked.

Further, these molded products may be laminated with two or more kinds of the above thermoplastic resin films,
Further, it may be laminated with cellophane, thermosetting resin molded body, aluminum foil or the like which does not soften or may be laminated with a metal deposition layer. The cloth is generally in the form of a nonwoven fabric or a woven fabric.

Next, the present invention will be described with reference to FIGS. The plastic molded product processing apparatus 1 cuts the plastic molded product 2 as described above, heat-fuses it, and processes it into a packaging bag or the like. As shown in FIG. By pressing the integrated processing blade 4 mounted thereon and heated by the power supply 10 via the temperature control panel 11, fusing and fusing can be performed simultaneously. A thermocouple 12 is provided at the center of the integrated processing blade 4 to control the temperature of the integrated processing blade 4.

The integrated processing blade 4 is made of a thin plate of conductive metal and is a flat plate having a thickness of about 0.5 to 5 mm. The processing blade 4 is fixed to a heat insulating plate 5 and is mounted on a mounting table 3 by a driving device (not shown). It is assembled on a guide plate 13 which is provided so as to be able to move up and down, and is pressed onto the molded product 2 on the mounting table 3. As shown in FIGS. 3 and 4, the processing blade 4 is provided with a cutting edge 6 acting as a cutting processing blade and a relief portion 7 acting as a fusion processing blade, and electrode terminals 8 at both ends. Is provided,
It can be directly connected to an electric circuit. The thickness of the processing blade may be set in consideration of the material, thickness, seal strength and the like of the molded article 2 to be processed.

Since the integral processing blade 4 is made of a metal flat plate, the shape of the blade can be freely formed as required, if necessary. As shown in FIG. It is fixed to a heat insulating plate by using the provided electrodes and thermocouple connection parts. It is possible to form not only the curved blade 4a shown in FIG. 2 but also, for example, a straight blade 4c in FIG. 6, a wavy blade 4d in FIG. 7, a mountain-shaped blade 4e in FIG. For example, in the case of making a bag, not only one side of the bag but also two opposite blades 4f, 4f or FIG.
In the case of the triangular blade 4b shown in (1), if the shape of the blade die is formed in such a manner, it is possible to simultaneously perform the cutting process and the fusion bonding process.

The cutting edge 6 acting as a cutting blade may be sharply pointed, but may have a narrow end face. When the cutting edge 6 is heated and pressed against the molded product 2, It is only necessary that the molded article 2 can be melted and cut by heat. Preferably, in order to further reduce the damage of the mounting table 3 to be pressed, it is desirable to have a blade tip surface having a narrow width of about 0.1 to 0.5 mm.

The relief portion 7 acting as a fusion blade can be used for fusion as it is even if it is the same as the cutting edge 6 of the cutting blade if the pressing force is adjusted. In order to form the integrated processing blade 4, as shown in FIG. 2, a fusion processing blade is provided by providing a relief portion 7 on one side of a cutting edge 6 of the cutting processing blade in a cross section of the blade as shown in FIG. 2. The escape portion 7 has an inclination angle a as shown in FIG.
As the (relief angle), about 0 to 45 ° may be provided, but a step 9 considering the thickness of the molded article may be provided as shown in FIG. It is preferable that the dimension t of the step 9 is slightly smaller than the thickness of the molded product 2 in a range of about 0 to 0.5 mm.

The material of the integrated processing blade 4 is made of a metal, but the metal is basically hard and generally has a heat resistance of about 500 ° C. or more, does not deform, and is not particularly limited as long as it is a good conductor of electricity. However, it is preferable to have rust prevention. A good conductor of electricity is more preferably a bad conductor than a very good conductor. For example, stainless steel, an alloy of nickel and chromium, and the like can be given.

The heat insulating plate 5 for fixing the integrated processing blade 4 can be applied as long as it is a heat insulating plate having heat resistance. Alternatively, it may be combined with a ceramic plate or the like. For example, as shown in FIG. 5, an FRP plate 5b is adhesively composited on a ceramic plate 5a, and a triangular blade 4b, 4
b, 4b may be fixed, and the electrode terminals 8, 8 and the thermocouple 12 may be provided.

Electric power is supplied to raise the temperature of the integrated processing blade 4. Since the heat is generated by the Joule heat of the current flowing through the processing blade 4, the current flowing through the processing blade 4 is required to efficiently generate heat. It is advantageous to increase the value, and it is desirable to use a power supply having a low voltage and a high current value as the power supply. For example, the processing blade 4 is a stainless plate having a thickness of 3 mm, a width of 7 mm, and a length of 200 mm, and the formed body 2 is a film of PET, PV, or the like. With a thickness of 20-50μ and a fold width of 120mm,
100W 2V, 50A, 210W 3V, 7
It is desirable that the voltage is about 0 A and the voltage is about 1 to 5 V to increase the current value.

A thermocouple 12 is provided on the side of the central portion of the integrated processing blade 4.
Is arranged to directly measure the temperature of the processing blade 4 and control the power supply, so that the temperature control of the processing blade 4 can be severely performed, and the temperature variation can be reduced.
The effect of securing the fusing accuracy, stabilizing the heat sealing strength, and improving the thermal efficiency is further ensured.

[0018]

Concrete Example Using a processing apparatus 1 for plastic molding shown in FIG. 1, cutting of a PET cylindrical film and processing of heat sealing were performed. The set temperature of the processing blade is 230 ° C,
The power of 3V, 70A is supplied, and after 5 minutes, the machining blade becomes 2
30 ° C. was reached. Temperature control at this temperature was performed within ± 2 ° C. The cylindrical film has a thickness of 25μ and a fold width of 12
0 mm, and the time of pressing on the molded article 2 is 0.1 mm.
30,000 tests were performed in 3 seconds. There were no mistakes in the cutting and heat seal processing, the processing was stable, and clean cutting of the end face and sufficient sealing strength were obtained. Further, when the temperature was lowered by blowing air to the processing blade, the power supply was turned on when the temperature dropped by 2 ° C., and the temperature returned to 230 ° C. in a few seconds, and it was also confirmed that there was no effect on the processing.

[0019]

According to the present invention, as compared with the conventional method, the processing blade is integrated and directly generates heat and the temperature of the processing blade is directly measured to control the power supply. The present invention provides a rational and efficient processing apparatus that can ensure the melting accuracy of the cut end and has good thermal efficiency and satisfactory heat seal strength. There is also an effect that the apparatus is compact and has a high degree of freedom in design.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an embodiment according to a processing apparatus of the present invention.

FIG. 2 is an overall perspective view of an embodiment of an integrated processing blade according to the processing apparatus of the present invention.

FIG. 3 is a sectional view of an embodiment of an integrated machining blade according to the machining apparatus of the present invention.

FIG. 4 is a sectional view of another embodiment of the integrated machining blade according to the machining apparatus of the present invention.

FIG. 5 is an overall perspective view of another embodiment of the integrated processing blade according to the processing apparatus of the present invention.

FIG. 6 is a perspective view of a blade shape of another embodiment of the integrated processing blade according to the processing apparatus of the present invention.

FIG. 7 is a perspective view of a blade shape of another embodiment of the integrated processing blade according to the processing apparatus of the present invention.

FIG. 8 is a perspective view of a blade shape of another embodiment of the integrated processing blade according to the processing apparatus of the present invention.

FIG. 9 is a perspective view of a blade shape of another embodiment of the integrated processing blade according to the processing apparatus of the present invention.

[Explanation of symbols]

 1. Processing equipment for plastic molded products 2. Molded product 3. Mounting table 4. Integrated processing blade 6. Cutting edge 7. Escape part 10. Power supply 12. thermocouple

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Yamaguchi 163 Munagawahara-cho, Moriyama City, Shiga Prefecture Gunze Co., Ltd.Shiga Research Institute (72) Inventor Masafumi Yamagami 163 Morikawahara-cho, Moriyama City, Shiga Prefecture Gunze Co., Ltd.Examiner in Shiga Research Center Maruyama Hideyuki (56) References Japanese Utility Model Application Hei 5-86497 (JP, U) Japanese Utility Model Application Hei 5-72391 (JP, U) Tokuhyo Hei 6-501397 (JP, A) (58) Fields surveyed (Int.Cl) . ^7, DB name) B26F 3/08

Claims (1)

(57) [Claims] 1. An apparatus for processing a plastic molded product comprising at least two film-like objects, wherein a processing blade comprises an integrated processing blade in which a fusion processing blade and a cutting processing blade are integrally formed. The processing blade is formed of a flat plate made of a thin conductive metal, and is formed into a predetermined blade shape, a curved blade, a straight blade, a wavy blade, a mountain-shaped blade, a two-sided blade, or a three-sided blade. In addition, electrode terminals are provided at both ends and fixed to a flat heat insulating plate, directly connected to an electric circuit, the integrated processing blade is directly supplied with heat, and a thermocouple is arranged on a side surface of a central portion of the same processing blade. A processing apparatus for plastic molded products, characterized in that the temperature of the plastic is directly measured and the power supply is controlled.