JP2622561B2 - Bag for collecting pollutant gas and its peripheral sealing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention mainly collects various kinds of pollutant gases and the like, and collects pollutant gases and the like made of polyester film for analysis and measurement of collected data. The present invention relates to a bag and a peripheral sealing method thereof.

[Conventional technology]

As a conventional technique for thermally bonding the peripheral portion (adhered portion) of two polyester film pieces stacked together for the production of a polyester film bag, for example,
58-38297, "Heat bonding method for polyester film"
As can be seen from above, two to several pieces of polyester film are stacked and supported by a clamping device so as to protrude the bonded portion of the film overlapped edge to the outside. After the heating element of the required length to be placed at a certain temperature is approached from a certain distance to the part to be bonded at an appropriate speed to the position where melting starts at the part to be bonded, the heating element is further contracted by melting of the part to be bonded. A heat bonding method for a polyester film, characterized in that the heating element is quickly separated and quenched when an appropriate melt-fusion portion is formed by continuing following and approaching at a speed equal to the speed.

Such a thermal bonding method by fusion bonding of a polyester film, even when using the above-mentioned so-called non-contact heat sealing method in which the control of heating is completely performed to minimize the thermal deterioration and the fusion-bonded portion is maintained, It was inevitable that the performance would be lower than the performance of the polyester film as the raw material film. In particular, when measuring the concentration of various pollutant gases or measuring the sensory content of various components, etc., and sensory measurement, a collecting bag made of a polyester film whose peripheral edge is heat-sealed is often provided. Such a bag is generally used by folding a rectangular film piece into two and heat-sealing three open sides.

However, even when the polyester film pieces were made into a bag by the thermal bonding method with a machine gun, slight differences were recognized in the strength aspects by the manufacturer or even by the same manufacturer. It was impossible.

Furthermore, the method of collecting pollutant gas, etc. often goes to the source of the source and collects it.In such a case, the bag after collection may be rubbed against other objects or damaged due to hooking, and during transportation in summer during automobile transportation Had various defects caused by the heat seal portion, such as expansion due to high temperature and rupture due to increase in internal pressure.

[Problems to be solved by the invention]

However, the bag for collecting pollutant gas and the like and the method for hermetically sealing the gas according to the present invention provide a novel technique developed as a result of earnest research in view of the various conventional defects described above. Regardless of the bag body having a fusion-bonded portion formed by heat sealing on the open peripheral portion, the collected gas until the time of measurement is measured based on the same performance as that of the raw material of the polyester film piece with the adhesive strength of the fusion-bonded portion. It is possible to reliably measure and analyze the concentration even if the bag has a variation in the fusion-bonded part, which is the temporary heat-sealing part, and cracks and cracks due to gas pressure in the fusion-bonded part It is an object of the present invention to provide a bag for collecting pollutant gas or the like, in which defects that occur and cause leakage of the collected gas are constantly eliminated, and a method of sealing the periphery thereof.

[Means for solving the problem]

In order to achieve the above-mentioned object, in the bag for collecting pollutant gas and the like according to the present invention and the sealing method therefor, a suction / discharge valve 4 is provided at an appropriate position on one side, and a fusion-bonded portion 3 is provided at a peripheral portion. In the bag A for collecting pollutant gas and the like composed of the formed polyester film pieces 5, the peripheral edge of the fusion-bonded portion 3 is turned to the same surface via the double-sided adhesive tape piece 2, and the other side of the bag A 5b are bonded together to form a bent bonding portion 6,
From the periphery of one side 5a of the bag A, which is inside the fusion-bonding portion 3, to the inside of the other one-side surface 5b beyond the fusion-bonding portion 3 of the bent adhesive portion 6, a plastic single-sided adhesive tape piece 1 Characterized by a bag body for collecting pollutant gas or the like in which the peripheral portion of the bag body is adhered to the bag body, and a rectangular or long polyester film piece 5 provided with a suction / discharge valve 4 in one place is folded in two, A method for sealing the periphery of a bag such as a pollutant gas in which a fusion bonding portion 3 is formed by applying heat bonding to the peripheral portion of each opening.
A plastic single-sided adhesive tape piece 1 is left around the inner side 5a of the bag body A, leaving a folded portion 7 serving as a hanging piece.
On the other side 5b of the polyester film piece 5,
One side of the double-sided pressure-sensitive adhesive tape piece 2 is adhered to the peripheral edge thereof, and then the other surface of the double-sided pressure-sensitive adhesive tape piece 2 is reversed and bonded to the same surface with the rear edge 8 as a boundary.
At the same time, the folded portion 7 of the plastic single-sided adhesive tape piece 1 is reversed over the inside of the other single-sided surface 5b beyond the fusion-bonded portion 3 of the bent adhesive portion 6 to form the polyester film piece 5 The method is characterized by a method of sealing the periphery of a bag for collecting pollutant gas or the like adhered to the other side 5b.

Hereinafter, specific examples of the bag for collecting pollutant gas and the like according to the present invention and a method for sealing the periphery thereof will be described in detail.

A is a rectangular collecting bag made of a transparent polyester film piece 5, and the bag A is formed by folding a rectangular or rectangular polyester film piece 5 in half and opening the three peripheral edges thereof. On the other hand, for example, a heating body at a certain temperature is brought close to the peripheral portion at a suitable speed from a certain distance without contacting the peripheral portion without contact, and further, the heating body is followed and approached at a speed equal to the contraction speed due to the melting of the peripheral portion. Thus, the bag A is produced by a known heat bonding method in which the heating element is quickly separated and quenched when an appropriate fusion-bonded portion 3 is formed.

The bag A is appropriately provided with a suction / discharge valve 4 at an appropriate position on one surface.

Numeral 1 is a single-sided adhesive tape piece made of plastic. The single-sided adhesive tape piece 1 has at least the same length as the fusion-bonded portion 3 or a length longer than it. Each of the single-sided adhesive tape pieces 1 is adhered along the periphery of each fusion-bonded portion 3 on one side 5a of the bag body A. One side is adhered in parallel so as to face the vicinity of the central part in the longitudinal direction, thereby forming a hanging portion beyond the fusion-bonded portion 3 by the single-sided adhesive tape piece 1. As a result, it is maintained in a state of being extended outside the fusion-bonded portion 3.

In some cases, instead of the single-sided adhesive tape piece 1 made of plastics, a tape piece obtained by applying a hot-melt type adhesive to a plastic film may be used. Is thermally bonded to the bag A.

After the fusion-bonded portion 3 faces the vicinity of the substantially central portion in the longitudinal direction of the single-sided adhesive tape piece 1 in this manner, the single-sided adhesive tape piece 1 is parallel to the single-sided adhesive tape piece 1 at a position slightly inside the fusion-bonded portion 3. The virtual return line 9 is set.

Reference numeral 2 denotes a double-sided adhesive tape piece having a release paper (not shown) adhered to the other surface thereof. The double-sided adhesive tape piece 2 is formed of the fusion-bonded portion 3 on the other one side 5b of the polyester film piece 5. It is glued together with the edge aligned along the periphery,
Such a double-sided pressure-sensitive adhesive tape piece 2 has a width corresponding to the width between the imaginary folded line 9 and the fusion-bonded portion 3 and has the same length as each fusion-bonded portion 3. .

Thus, along the fusion-bonded portion 3 of the polyester film piece 5, a part of the single-sided adhesive tape piece 1 is left on the one side 5a except for the hanging part, and the double-sided adhesive tape piece is attached to the other one side 5b. In the state in which the tapes 2 are bonded to each other, the other side 5b of the double-sided pressure-sensitive adhesive tape piece 2 corresponding to the fold line 9 is reversely bent to the same surface on the other side 5b, and the other surface of the tape piece 2 is bonded. Thus, the bent adhesive portion 6 is formed so that the fusion-bonded portion 3 faces in the middle direction of the bag body A. By forming the bent adhesive portion 6 in this way, the folded portion 7 of the single-sided adhesive tape piece 1 bonded inward from the fusion-bonded portion 3 around the one surface 5a of the polyester film piece 5 The portion 6 is turned over to the other side 5b of the polyester film piece 5 beyond the fusion-bonded portion 3 and fixed by pressure bonding, so that the bent adhesive portion 6 is securely covered over a wide area.

〔The invention's effect〕

Thus, according to the present invention, the fusion-bonded portion 3 of the bag body A is inverted at its inner position with the rear edge 8 of the double-sided adhesive tape piece 2 as a boundary, adhered on the same surface, and attached to the outer surface. The exposed fusion-bonded portion 3 is surrounded and adhered by the single-sided adhesive tape piece 1 covering the bag body A, the one side 5a and the other one side 5b, so that the tensile force due to the pressure of the collected gas is directly applied to the bag body A. And the single-sided adhesive tape piece 1, which is a reinforcing film, has the function of receiving the tension, and is bent by the pressure even if the pressure increases due to the expansion of the gas in the temporary summer or the like. The close contact of the bonding portion 6 becomes tough, and the fusion-bonded portion 3
The effect of remarkably relieving the pressure applied to the substrate can be exhibited. In other words, by bending the fusion-bonded portion, the melt-bonded portion that is easily weakened can be integrally assimilated with the polyester film bag, and a tough bag can be obtained. .

When each peripheral portion is successively applied to the fusion-bonded portion 3, the corner portion serving as a joint is subjected to overlapping heating and inevitably undergoes thermal deterioration. According to the present invention, however, the corner portion is formed of a single-sided adhesive tape. Since it has a double structure with the piece 1, this weak point can be prevented and the fusion-bonded portion 3 can be reinforced evenly, so that a huge-capacity collecting bag body having no leakage at the corner due to the internal pressure of the collecting gas can be manufactured. This is also preferable.

Furthermore, since the fusion-bonded part 3 is securely reinforced and protected, rubbing with other objects and breakage due to hooking can be prevented as much as possible, and accurate concentration measurement and analysis can be performed in a pure state. In addition to smoothing, two types of bonding can be performed at the same time in a simple one-time folding process, and the periphery can be reliably sealed,
There is also an effect that the material cost is reduced.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a front view of a completed product, FIG. 2 is a sketch showing a bonding method, and FIG.
FIG. 4 is a partially cutaway view showing the bonding method, FIG. 4 is a longitudinal sectional view in FIG. 2, FIG. 5 is a longitudinal sectional view in FIG. 3, and FIG. It is a longitudinal section of the important section. DESCRIPTION OF SYMBOLS 1 ... One-sided adhesive tape, 2 ... Double-sided adhesive tape piece 3 ... Melt-fusion part, 5 ... Polyester film piece 6 ... Bending adhesive part

Continuation of the front page (56) References JP-A-62-235064 (JP, A) JP-A-48-88787 (JP, U) JP-A-55-63744 (JP, U) JP-A-63-158851 (JP) , U)

Claims (2)

(57) [Claims] 1. A bag A for collecting pollution gas or the like, comprising a polyester film piece 5 having a suction / discharge valve 4 attached at an appropriate position on one side thereof and a fusion / fusion portion 3 formed on a peripheral portion thereof. The peripheral portion of the portion 3 is inverted to the same surface via the double-sided adhesive tape piece 2 to bond the other side 5b of the bag body A together to form a bent bonded portion 6, and to be inward from the fusion-bonded portion 3. From the periphery of one side 5a of the bag body A to the inner side of the other one side 5b beyond the fusion-bonding portion 3 of the bent adhesive portion 6, surrounding the plastic single-sided adhesive tape piece 1 to surround the periphery of the bag body. A bag for collecting pollutant gas and the like, characterized in that the parts are adhered. 2. A rectangular or long polyester film piece 5 provided with a suction / discharge valve 4 at an appropriate position on one side is folded in two, and a thermal fusion is applied to the periphery of each opening to form a fusion-bonded portion 3. This is a method of sealing the periphery of a bag body such as a pollutant gas, wherein
A plastic single-sided adhesive tape piece 1 is left around the inner side 5a of the bag body A, leaving a folded portion 7 serving as a hanging piece.
On the other side 5b of the polyester film piece 5,
One side of the double-sided pressure-sensitive adhesive tape piece 2 is adhered to the peripheral edge thereof, and then the other surface of the double-sided pressure-sensitive adhesive tape piece 2 is reversed and bonded to the same surface with the rear edge 8 as a boundary.
At the same time, the folded portion 7 of the plastic single-sided adhesive tape piece 1 is inverted over the inside of the other single-sided surface 5b beyond the fusion-bonded portion 3 of the bent adhesive portion 6 and the polyester film piece 5 is formed. A method of sealing the periphery of a bag for collecting pollutant gas or the like, characterized in that the bag is adhered to the other side 5b.