JPS597015A - Method of impulse sealing of film - Google Patents

Abstract

PURPOSE:To prevent sealing dregs from adhering to a nichrome wire, and to produce quickly a plastic film having an enough sealing strength, by cutting the passage of an electric current to the nichrome wire in accordance with its position when a heat holder is driven. CONSTITUTION:While a long plastic film is being folded once, it is fed onto a Teflon cloth 8 placed on a receiving table 2 with a rubber cushion 2a therebetween. When a heater holder 4 is lowered and it reaches a point C near the lowest poing B, the passage of an electric current to the nichrome wire 5 is started, and after the film 7 is melted and welded at the lowest point B, the passage of the electric current is cut, and the heater holder 4 is raised. When the heater holder is raised, an electric current is passed to the nichrome wire at the point C to heat it thereby burning the sealing dregs 7'' adhered to the nichrome wire to be removed. At a point D, the passage of the electric current is cut, and it is raised to the highest position where it is waited.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of impulse-sealing a film, in which a nichrome wire is pressed onto a film such as the above, and the wire is heat-sealed.

Conventionally, various methods have been used to fuse and seal stacked films. Generally, there are heat sealing methods and impulse sealing methods, and for example, a conventional impulse sealing method Kfd uses an apparatus as shown in FIG. 1. The plush boot film 1 is placed on the cushion rubber 2a fixed to the soil of the pedestal 2. The cushion rubber 2a is fixed to the soil. Directly above the plastic film 1, there is provided a heater holder 4 which is moved up and down by an air cylinder or a foot pedal (not shown).

A nichrome wire 5 is attached to the lower end of the heater holder 4 with a Teflon cloth 4a interposed therebetween for fusing the silicone film l. The heater holder 4 is engaged with refrigerant inlets and outlets ii and io, and is connected to a cooling device (not shown) to cool the heater boulder 4. The film presser 6 is provided to surround the heater holder 4, and its lower end is formed to slightly protrude beyond the lower end of the heater holder 4.

This film presser 6 is lowered together with the heater holder 4, and the nichrome wire 5 of the heater holder 4 is attached to the glass film 1.
Before contacting the plastic film 1, the plastic film 1 is contacted and held.

Next, the operation of the apparatus according to the conventional impulse sealing method configured as described above will be explained. 1. Lower the heater holder 4 using an air cylinder (not shown) or a foot pedal, and press the Teflon cloth (2 or more sheets placed on top) of the plastic film 1 on the receiving plate 2 with both ends of the film presser 6. Next, the nichrome wire 5 comes into contact with the plastic film 1 and presses it. In this situation, the nichrome wire 5 is energized by a micro switch (not shown), etc., and it suddenly generates heat. The wire 5 is held in this state for several seconds.The plastic film 11/i is melted by this heat, and as shown in FIG. Then, form the fused portion 1'.

Fusing or fusing a plastic film can be done reliably by applying a high temperature to the fusing or welding part, and by taking a certain amount of time.
Teflon cloth 4 a attached to heater boulder 4
'1 Receiving plate 2 Soil Teflon cloth 3 and nichrome wire 5
It adheres to the surface as seal scum. This seal scum 1"
increases due to the above-mentioned repeated operations, and when the temperature of the nichrome wire 5 becomes low, the plastic film fused portion 1
1' side, resulting in the disadvantage that the plastic film fused portion 1' opens. Therefore, in order to eliminate this drawback, the nichrome a5 is preheated until the heater holder 4 reaches the lowest position, and when the lowest position is reached, a voltage is applied to the nichrome wire 5 as described above to melt the plastic film l. Perform fusion. When this is completed, the nichrome wire 5 is preheated to melt and vaporize the seal scum 1, thereby preventing the seal scum 1 from remaining on the nichrome wire 5. However, in this method, as mentioned above, since the nichrome wire is not energized at all times, the time required for the temperature of the nichrome wire 5 to drop to a predetermined temperature is increased, resulting in a problem that the sealing speed is reduced. Furthermore,]
Since the zero-last snack film 1 is taken out before it cools down, there is a large amount of heat shrinkage after taking it out, causing the product to lose its shape.
It also had the disadvantage of lacking seal strength. Further, since the heater holder 4 is constantly energized, the temperature of the heater holder 4 rises, which has the disadvantage of promoting the adhesion of seal scum to the heater holder 4.

The present invention was devised to solve the above-mentioned drawbacks, and its purpose is to prevent seal scum from forming on nichrome wire, etc., and to provide sufficient sealing strength and fast sealing speed. Impulse sealing method for film
Jf: It's about providing.

Hereinafter, one embodiment suitable for carrying out the present invention will be described based on the drawings.

In FIG. 3, the same parts as those of the conventional one are indicated by the same reference numerals, and redundant explanation will be omitted. Reference numeral 7 indicates a long plastic film (hereinafter simply referred to as a film) wound on a reel (not shown), and reference numeral 8 indicates a Teflon cloth mounted via a cushion rubber 2a fixed to the soil of the pedestal 2. . The film 7 is manually or mechanically folded into two sheets and then fed and placed on the Teflon cloth 8 with a stereotaxic mark previously marked on the pedestal 2. At the same time, the illustrated air cylinder is actuated to move the heater holder 4, which is interlocked with the air cylinder, up and down. When the heater holder 4 descends, the heater holder 4 reaches the first point (C) near the lowest position (B).
When K is reached, the nichrome wire 5 attached to the lower end 4a of the heater holder is energized by a micro switch (not shown) to bring the filter 7 into a state where it can be melted. The heater holder 4 descends to the lowest position (B) in this state, but before that, both end surfaces of the film presser 60 press the film 7 r-E. Even after the heater holder 4 reaches the lowest position (B), the nichrome wire 5 continues to be energized. The nichrome wire 5 strongly presses the folded film 7 into two against the Teflon cloth 8, and melts the folded film 7. Then turn off the nichrome wire 5,
Cool the nichrome wire 5 etc. while placing it as it is, and form the film 7.
Weld the melted parts of the Thereafter, the p-heater holder 4 is raised by the actuation of the air cylinder, and at this time, the fused film 7 is cut off by a mill or machine at the narrowed part of the fused portion 7', as shown in FIG. 4, and divided into two parts. do.

The raised heater holder 4 reaches the first point (C) 1j
When this point is reached, the nichrome wire 5 is energized again, and the line moves up to the -1-1 second point (D). By energizing the Nichrome wire 5 during the time when the heater holder 4 rises from the first point (C) to the second point 0)), the seal scum 7 attached to the Nichrome wire 5 is incinerated and vaporized. This can be removed. Next, raise the nichrome wire 5" at the second point (D), and then raise it again to the first point (
C) and complete the cycle.

As described above, the nichrome wire 5 is heated when necessary and sufficiently cooled when unnecessary, so that the sealing speed can be increased. On the other hand, there is no fear that the film 7 will be taken out before it cools down, and the sealing strength of the film 7 can be maintained.

On the other hand, as described in 1., the Teflon cloth 8 is placed on the pedestal 2 and is movable by means not shown. Therefore, by moving the Teflon cloth 8 at appropriate time intervals, the film 7 is sealed at a new location.

Therefore, the heat stored in the Teflon cloth 8 is radiated,
Since the film 7 is fused with the Teflon cloth at a low temperature, the sealing strength can be improved.

As is clear from the following explanation, according to the present invention,
In addition to preventing seal scum from adhering to the nichrome wire,
Plastic with sufficient strength.

The effect of speeding up the production of film can be increased.

[Brief explanation of drawings]

f' Figure 1 is an explanatory diagram explaining the conventional film impulse knoll method, Figure 2 is an explanatory diagram showing the fused state of the film and the stuck state of seal scum, and Figure 3 is an explanatory diagram explaining one embodiment of the present invention. FIG. 4 is an explanatory diagram showing the fused state of the film. 1.7...Plastic film, 3,8...Teflon cloth, 4...Heater holder, 5...Nichrome wire, 6...Film holder. Patent Applicant Kawa” - Representative of Sangyo Co., Ltd. Satoshi Kawakami 65 Fang/Zu Fang 2 Figure 110--Q Ri

Claims (1)

[Claims] Place at least two stacked/ζ plastic films on a Teflon cloth, lower the nichrome wire attached to the lower end of the heater holder provided directly above the plastic film, and press it against the plastic film. Melt this and fuse the above two or more glass films together to form an inner layer of the seal film.
In the G-Russeal method, the Teflon cloth is movable, the contact position between the Teflon cloth and the plastic film is made variable, and a first point and a second point are placed between the highest position of the heater holder and this lowest position. 2
When the heater holder reaches the first point near the lowest position, the nichrome wire is energized to melt the plastic film, and the heater holder is lowered to the lowest position. Continue energizing at position 1! -L, turn off the electricity, cool the nichrome wire etc. in the state of 11, then raise the heater holder and energize the nichrome wire again at the first point,
The heater holder is raised as it is and continues to be energized to the second point, and at the second point the heater holder is raised to the highest position, and then the heater holder is raised again to the first point. Finish the cycle by lowering it to 2 above.
This is an impulse sealing method that fuses and seals more than one sheet of plastic film.