JPH0957855A - Both side heat sealer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily automate fitting of a grip while a difference between both sides is removed and lining up is made easy by a method wherein films to be sealed or the film and a molded product or the like are respectively placed on both sides, pressed, and besides cooled after applying an electricity thereto. SOLUTION: For a plane like heater 1, for example, a nickel chromium alloy sheet of about 0.2mm thickness is cut out by a uniform narrow width of 2mm in an elliptic shape to make a heater 3. While a wire width is made steeply thicker from a center of a long side to outside, a non-heating lead wire 4 is put out. They are put between tetrafluoroethylene coated glass cloths with a pressure sensitive adhesive from both sides to be fixed. The plane like heater 1 is placed at a specific position, a bag 2 is arranged so as to cover the plane like heater 1 from its opening part, further the elliptic grip 6 molded by polyethylene is placed on both surfaces outside the bag 2, pressed with a pressing plate of a heat sealer, and heated by applying electricity. When taken out after heating, the bag 2 and the grip 6 are completely sealed from both sides.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat sealer made of a plastic film such as polyethylene, and more particularly to an impulse heat sealer in which an oblong handle attached to the surface of a bag is heat sealed on both sides at the same time.

[0002]

2. Description of the Related Art Heretofore, a hot plate heater fixed to a pressing plate has been used to seal an oblong handle, which is stacked on the outside from the inside of the bag, one side at a time. The surface of the bag where the handle is attached is
Since the surface treatment is applied for printing, it does not fit with a normal hot plate seal.Therefore, a small protrusion is tightly formed and placed on one side of the handle, pressed while melting the film of the bag, and the tip of the penetrating protrusion is fixed. It was melted, crushed and bonded to the film.

On the other hand, since the impulse heater is used by fixing the heating wire on the pressing plate with an adhesive tape such as ethylene tetrafluoride coating, it is thick and the usage method is the same as that of the hot plate sealer. It took more than twice as long, so it was never used.

[0004]

Since the handle cannot have a fine protrusion tightly formed on its surface, it has a clean surface and two front and back surfaces. When attempting to automate the attachment of the handle, Since it was necessary to align them on either side, it was a very difficult process, and the attachment strength for melting and crushing the tips of the protrusions by the hot plate heater and joining them with the film was not very strong.

Further, since the oval handle has a completely symmetrical shape and position, it has to be sealed twice. Therefore, it takes twice as long as a single process, which is natural. He was consuming twice as much heat.

[0006]

[Means for Solving the Problems] In the impulse heat sealing method, a thin metal plate is cut out into a shape of a handle to be sealed with a uniform narrow width, and it is cut from both sides with an adhesive material such as tetrafluoroethylene coated glass cloth. Sandwiched between
It was fixed to form a flat heater. Arrange it so that it is pressed at a fixed position on the pressing plate, place the opening of the bag to be sealed and the flat surface handle on both sides of the heater,
Sealed.

[0007]

[Function] When a flat heater is heated while pressing,
Both sides were sealed at the same time, and the handle was so strong that it was incomparable to the hot plate seal.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the present invention, in which a flat plate heater 1 without a pressing plate of an impulse heat sealer is used.
In the plan view of the polyethylene bag 2, the flat heater 1 is about to be inserted through the opening of the bag 2. FIG. 2 is a central vertical sectional view thereof.

The flat heater 1 is, for example, a thin plate of nickel-chromium alloy having a thickness of about 0.2 mm and is cut into an oval shape with a uniform narrow width of 2 mm to form a heater 3.
From the center of the longer side to the outside, the lead wires 4 that did not generate heat were taken out while the wire width was rapidly increased, and they were fixed by sandwiching them from both sides with an adhesive tetrafluoroethylene coated glass cloth 5.

The material for fixing may be not only a glass cloth with an adhesive material but also a heat resistant sheet and an adhesive. However, it is good to stick tetrafluoroethylene tape or the like on the surface. Although it can be used as it is, if electrically insulating around the heater 3 and sandwiching a thin iron plate at the same time, the flatness of the finished flat heater 1 becomes stronger and stronger.

Place the flat heater 1 in place,
The bag 2 is arranged so as to cover the flat heater 1 from its opening, and the elliptic handles 6 also made of polyethylene are placed on both outer surfaces of the bag 2 and are omitted in the drawing. However, if the bag 2 and the handle 6 are pressed by the pressing plate of the heat sealer, heated by energizing, cooled, and taken out, both sides of the bag 2 and the handle 6 are completely sealed.

The handle used in this method may have a flat surface.
Even so, with the normal impulse heat sealing method, the handle is strong because the treated bag is treated so that the treated film is firmly sealed with the untreated film, but the other handle is not treated. To be sealed.

All the generated heat was absorbed by the film and handle on both sides. Until now, the amount of heat that can be dissipated on one side has been effectively used, so the amount of heat used has been reduced to a quarter when combined with the halving of the number of times. In addition, the temperature rise of the heater has also decreased, and continuous use is possible in a much better condition than before.

The method of taking out the lead wire 4 from the heater 3 is as follows.
In addition to the shape shown in FIG. 1, there is also a method of drawing from both sides of a closed ellipse, and it is necessary to change the current and voltage to be flown accordingly. In addition, in the handle, the temperature of the heater at the take-out point of the lead wire is low, and there is often no problem even if the seal is incomplete. However, the shape of the take-out point varies depending on whether a complete seal is required.

Since the handle is normally the same as the front and back, the handle is not limited to the elliptical shape, but may be any shape as long as it is attached from the outside of the bag. Therefore, there is a possibility that interesting handles will come out depending on the design.

Not only can it be attached to a handle, but it can be applied not only to films, but also to a bag, a balloon, an inflatable toy, etc. by inserting a flat heater between gusset-folded films and sealing the same type on both sides. Can be used.

[0017]

According to the heat-sealing method of the present invention, since the handle does not need fine protrusions, the front and back sides are eliminated, alignment is facilitated, and automation of handle attachment becomes easier.

Since both sides can be heat-sealed in one operation, the handle can be attached in half the time and labor required for impulse heat-sealing, and the workability is comparable to that of the conventional hot plate seal. Have efficiency.

Up to now, the amount of heat that is radiated on one side is also effectively used, so the amount of heat used has been reduced to a quarter when combined with the fact that the number of times has been halved.

Moreover, the attachment strength of the handle is much larger than that of the method using the hot plate heater.

The present invention can be applied not only to the handle attachment but also to the film comrades, and since it can be sealed from the inside of the film, it can also be used for the production of unusual bags, balloons, inflatable toys and the like.

[Brief description of drawings]

FIG. 1 is a plan view of an example of the present invention.

FIG. 2 is a central longitudinal sectional view of FIG.

[Explanation of symbols]

1 planar heater 2 bag 3 cut out heater 4 lead wire 5 adhesive tetrafluoroethylene coated glass cloth 6 handle

Claims (2)

[Claims] 1. An impulse heat sealer comprising upper and lower pressing plates, a heater, a power source, a controller, etc., a thin metal plate is cut into a desired shape with a uniform narrow width, and the necessary lead wires are connected to it. It is sandwiched from both sides with an adhesive material such as tetrafluoroethylene coated glass cloth, and if necessary, a thin reinforcing plate is also sandwiched and fixed to form a flat heater, and it is arranged so that it is pressed at a fixed position of the pressing plate and leads. Connect the wires to the power supply and place the polyethylene film or other film to be sealed, or the film and molded product on both sides of the heater, press and energize, and cool to seal both sides at the same time. Characteristic heat sealer. 2. The heat sealer according to claim 1, wherein a flat heater is inserted into the inside of the bag, and the handles of the moldings placed on both outsides of the bag are simultaneously sealed.