JP2003237717A - Method for heating sealing part of resin tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a good sealing by uniformly heating the inner and outer peripheries of the end of an resin tube to be the sealing part of the resin tube, and also to prevent a device for heating the tube from rising to a high temperature by cooling exhaust and evacuating it with a high speed. <P>SOLUTION: This device 12 heats the sealing part of the resin tube and is configured such that a nozzle 13 blows heated wind and it heats the end (an upper end 2c) of the resin tube 1 to be the clamped sealed part thereof. The nozzle 13 blows both heated wind W1, W1... which heats the inner periphery of the end (the upper end 2c) of the resin tube to be the clamped and sealed part thereof and heated wind W2, W2,... which heats the outer periphery of the end. The exhaust of the heated wind W1, W1... and W2, W2... is mixed with high speed wind W3, W3,..., and cooled and then exhausted. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating a seal portion of a resin tube, and more particularly to a resin tube for filling a filling material such as cosmetics and adhesives. The present invention relates to a method for heating a seal portion of a resin tube in which hot air is jetted and heated to soften and melt the end portion of the resin tube that serves as a seal portion for clamp sealing.

[0002]

2. Description of the Related Art A conventional resin tube of this type will be described with reference to FIGS. In FIG. 3, reference numeral 1 is a resin tube as a finished product filled with a filling material such as cosmetics or an adhesive.
The resin tube 1 is formed of a flexible synthetic resin, and a neck portion 2a having a spout (not shown) at one end of the tube body 2 of the resin tube 1, the neck portion 2a and the tube body. A shoulder portion 2b that connects the two ends over the entire circumference is integrally formed with the tube body 2, and the neck portion 2a is formed.
A threaded cap 3 is detachably attached to the tube body 2, and a filling material (not shown) is filled in the tube body 2, and the other end of the tube body 2 is clamp-sealed by heat fusion. There is.

Next, a method of filling the resin tube 1 with a filler and a method of clamp sealing will be described. First, as shown in FIG. 4, a cap 3 is attached to the resin tube 1 to close the spout. , Holding the resin tube 1 upside down with the cap 3 side downward, opening the upper end 2c of the tube body 2, and providing a filling nozzle 4 for filling a filling material in the upper end 2c. Insert into
A filling material F is filled in the tube body 2.

Next, as shown in FIG. 5, the resinous tube 1 is carried into the heating device 5 for the seal portion, and is inserted into the opening of the upper end portion 2c which serves as a clamp seal portion of the resinous tube 1.
The tip portion of the hot air nozzle 6 provided in the seal heating device 5 is inserted by a predetermined length. Here, the seal heating device 5
The hot air nozzle 6 provided in the seal heating device 5 is formed with a plurality of jet holes 6a, 6a for jetting hot air in the radial direction on the outer periphery of the tip portion, and the hot air nozzle 6 serves as a heat source. It is connected to a hot air generator (not shown) provided.

Further, the hot air nozzle 6 is surrounded by an exhaust pipe 7 with a predetermined interval, and the exhaust pipe 7 has a blower for sucking exhaust gas on the downstream side (upper side in the figure). (Not shown), the lower end of the exhaust pipe 7 extends slightly below the tip of the hot air nozzle 6, and the lower end is provided with an inward flange 7b having an opening 7a in the center. The opening 7a is formed to have a diameter slightly larger than the outer diameter of the upper end 2c of the tube body 2 in the opened state. In addition, without connecting a blower to the downstream side of the exhaust pipe 7,
A configuration is also known in which hot exhaust air is diffused by a simple porous shield plate or the like.

The hot air introduced from the hot air generator flows into the hot air nozzle 6, and the hot air ejected from the ejection holes 6a, 6a provided in the hot air nozzle 6 is supplied to the tube body 2. After heating the inner peripheral portion of the upper end 2c to soften and melt it, it flows out into the exhaust pipe 7 as high-heat exhaust, and the high-heat exhaust is sucked by a blower installed downstream of the exhaust pipe 7 It is discharged to the downstream side of the pipe 7.

When the upper end 2c of the tube body 2 is heated to a predetermined temperature and softened and melted, the resin tube 1
Is removed from the seal part heating device 5, carried into the seal clamp device 8 shown in FIG. 6, and the softened and melted upper end part 2c of the tube body 2 is clamped by the clamp part 8a of the seal clamp device 8. It is fused and sealed.

However, as described above, in the seal part heating device 5, the high-heat exhaust gas is sucked by the blower and discharged to the downstream side of the exhaust pipe 7, so that the exhaust pipe 7 and each part of the seal part heating device 5 and The temperature of each device becomes high, which is extremely dangerous, and the high temperature may damage each part of the device and each device.

Further, as the high-heat exhaust gas is sucked by the blower installed on the downstream side of the exhaust pipe 7 and discharged to the downstream side of the exhaust pipe 7, the opening 7a of the exhaust pipe 7 and the resin The outside air flows in through the gap between the upper ends 2c of the resin tube 1, and the outside air causes the upper end 2 of the resin tube 1 to flow.
c The outer peripheral portion is cooled. As a result, the inner peripheral portion of the upper end portion 2c is heated and expanded, while the outer peripheral portion of the upper end portion 2c is cooled and contracted, so that the upper end portion 2c has a trumpet shape as shown in FIG. Expand toward the edges.

Further, since the outer peripheral portion of the upper end portion 2c of the resin tube 1 is cooled by the inflow of the outside air, the heat of the inner peripheral portion is transmitted to the tube main body 2 and is transmitted to the outer peripheral portion to There is a concern that the temperature of the peripheral portion may decrease and the inner peripheral portion may not be kept at a sufficiently high temperature at the time of clamp sealing.

As described above, when the clamp seal is made with the upper end portion 2c expanded in a trumpet shape, as shown in FIG. 8, the seal portion expands laterally, resulting in a defective product, and the upper end portion. If the clamp sealing is performed in a state where the inner peripheral portion of 2c is not kept at a sufficiently high temperature, a sealing failure may occur and the sealing portion may be punctured in a product state.

Further, in order to avoid the sealing failure, if the heating temperature is further raised in order to supplement the temperature decrease of the inner peripheral portion of the upper end 2c of the resin tube 1, when the clamp sealing is performed, As shown in FIG. 5, slack s in the form of a hive is generated on the outer peripheral portion of the upper end portion 2c, and the appearance of the finish is deteriorated.

Therefore, in order to solve the problems of the seal heating device 5, a seal heating device 9 shown in FIG. 9 is known. That is, the seal part heating device 9 is provided with a hot air nozzle 10 in place of the hot air nozzle 6 of the seal part heating device 5, and the hot air nozzle 10 is provided with a bottomed inner cylinder 10a at the center of the tip, The inner cylinder 10a has a plurality of ejection holes 10b, 10b, ...
An outer cylinder 10c having a predetermined gap is provided on the outer peripheral portion of b with a predetermined gap.

The inner diameter of the outer cylinder 10c is formed to be slightly larger than the outer peripheral portion of the upper end 2c of the resin tube 1, and the outer cylinder 10a extends from the ejection holes 10b, 10b ... The hot air blown to the inner circumference of the upper end 2c is guided to the outer circumference of the upper end 2c.

Therefore, the hot air introduced from the hot air generator flows into the hot air nozzle 10 and the hot air nozzle 10
The hot air blown out from the blowout holes 10b, 10b provided in the above heats the inner peripheral portion of the upper end portion 2c of the tube main body 2, softens and melts it, and then is guided to the outer cylinder 10c as shown in FIG. From the upper end of the upper end portion 2c to the outer peripheral portion of the upper end portion 2c, the outer peripheral portion is heated and flows into the exhaust pipe 11, and the high-heat exhaust gas is discharged by the blower installed on the downstream side of the exhaust pipe 11. It is sucked and discharged to the downstream side of the exhaust pipe 11.

According to the seal portion heating device 9, the outer peripheral portion of the upper end portion 2c of the resinous tube 1 is heated by the hot air guided by the outer cylinder 10c, and the hot air is guided by the outer cylinder 10c. Since there is a slight temperature drop when flowing into the outer peripheral portion of the upper end 2c, and there is also an inflow of outside air due to suction of the blower, the resinous tube 1 is still slightly trumpet-shaped as shown in FIG. There is a tendency to expand, and there is a risk of product defects in which the seal portion after the clamp seal spreads laterally.

Further, in the seal portion heating device 9, as in the seal portion heating device 5, the high heat exhaust gas is sucked by the blower installed on the downstream side of the exhaust pipe 11 and discharged to the downstream side of the exhaust pipe 11. Therefore, the problem that the temperature of the exhaust pipe 11, each part of the apparatus, and the device becomes high has not been improved.

Therefore, the inner peripheral portion and the outer peripheral portion of the end portion which becomes the sealing portion of the resinous tube are uniformly heated to obtain a good seal, and the exhaust gas is cooled and exhausted at high speed to raise the temperature of the apparatus. A technical problem to be solved in order to prevent the above problem arises, and an object of the present invention is to solve this problem.

[0019]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and is constructed such that hot air is jetted from a nozzle to heat an end portion of a resinous tube which becomes a clamp seal portion. In the heating device for the sealing portion of the resinous tube, the hot air that heats the inside of the end of the resinous tube that serves as the clamp sealing portion of the resin tube and the hot air that heats the outside of the end are mixed. Heavy heating resin tube seal part heating method and resin tube seal part heating device configured to heat hot air from a nozzle to heat a clamp seal part end of the resin tube In this case, hot air that heats the inner peripheral portion of the end that is the clamp seal portion of the resin tube and hot air that heats the outer peripheral portion of the end are doubly jetted from the nozzle, and The exhaust is cooled by mixing with high-speed air to be introduced from the other, and is intended to provide a seal heating method for resinous tube discharge.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIGS. For convenience of description, the same components as those of the conventional example will be designated by the same reference numerals and the description thereof will be omitted. In FIG. 1, reference numeral 12 is a sealing part heating device for the resinous tube 1, the sealing part heating device 12 is provided with a nozzle 13, and the nozzle 13 is a hot air generator (not shown).
And is configured so that hot air is introduced from the hot air generator.

Further, the tip portion 13a of the nozzle 13 is formed to have a diameter slightly smaller than the inner diameter of the upper end portion 2c serving as a seal portion of the resin tube 1 in the open state, and the tip portion 13a.
A plurality of small holes 14, 14 for blowing hot air are provided on the outer periphery of the
... has been opened. Further, the tip portion 13 of the nozzle 13
A second nozzle portion 15 having a diameter slightly larger than the outer diameter of the upper end portion 2c of the resin tube 1 in the open state is continuously provided above a, and the outer periphery of the lower end of the second nozzle portion 15 is provided. A plurality of small holes 16, 16 ...
It is configured to be divided into 5 ... and jetted from the small holes 16, 16 ...

An exhaust pipe 17 is provided outside the nozzle 13 and the second nozzle portion 15 so as to surround the nozzle 13 and the second nozzle portion 15 with a predetermined gap. A gap between the exhaust pipes 17 serves as an exhaust hole 18. Further, an outer cylinder 19 surrounding the exhaust pipe 17 is provided outside the lower end of the exhaust pipe 17 with a predetermined gap.
A gap between the exhaust pipe 17 and the outer cylinder 19 is an air introduction hole 2
It is 0.

The upper end portion of the outer cylinder 19 has the exhaust pipe 17
Is fixed to the outer peripheral portion of the exhaust pipe 17 and is closed, the lower end of the outer cylinder 19 extends below the lower end of the exhaust pipe 17, and an inward flange 21 is formed at the lower end. An inner cylinder 22 whose both ends are open is fixed to a central opening of the inward flange 21, and the inner cylinder 22 is configured to be loosely inserted into the lower end of the exhaust pipe 17 by a predetermined length.

The inner diameter of the inner cylinder 22 is formed to be slightly larger than the outer diameter of the upper end portion 2c, which is the clamp seal portion of the resin tube 1, in the open state, and the outer circumference of the inner cylinder 22 is also increased. Portion and the inner peripheral portion of the lower end of the exhaust pipe 17 form an ejection hole 23, and the inner peripheral portion of the lower end of the exhaust pipe 17 is obliquely formed so that the ejection hole 23 is narrowed in the ejection direction to be large. Has been done.

Further, the outer cylinder 19 is connected to an introduction pipe 24 by opening a predetermined portion of the outer peripheral portion thereof, and the introduction pipe 24 is connected to a high pressure blower (not shown). Thus, the sealing portion heating device 12 is held in the opening of the upper end portion 2c of the resinous tube 1 which is held upside down and filled with the filling material F.
After the tip of the nozzle 13 is inserted for a predetermined length from above, hot air is ejected from the hot air generator and the nozzle 1
3, the small hole 1 opened in the nozzle 13
Hot air w1, w1 ... Is jetted from 4, 14, ... After heating and softening and melting the inner peripheral portion of the upper end portion 2c of the resinous tube 1, it flows into the exhaust hole 18 as high-heat exhaust gas, and further, The hot air split in the nozzle 13 is ejected from the small holes 16, 16 ... Of the second nozzle portion 15 toward the outer peripheral portion of the upper end 2c of the resin tube 1 (hot air w2, w2 ...).
Is heated to soften and melt the outer peripheral portion of the upper end 2c,
The high-temperature exhaust gas flows into the exhaust hole 18.

That is, the resinous tube 1 has an upper end 2c.
The inner peripheral portion and the outer peripheral portion thereof are heated by receiving the double hot air blown from the small holes 14, 14 ... And the small holes 16, 16 ,. On the other hand, the high-pressure air sent from the high-pressure blower flows into the introduction hole 20 through the introduction pipe 24, and then the ejection hole 23 is formed in a large size.
Are squeezed by the exhaust air into the exhaust holes 18 to form high-speed winds w3, w3 ,.
The high-heat exhaust is mixed with the high-heat exhaust in 8 to rapidly cool the high-heat exhaust, and the high-heat exhaust is discharged at a high speed downstream of the exhaust hole 18.

Thus, the upper end portion 2c of the resinous tube 1 heated by the seal portion heating device 12 is jetted from the small holes 14, 14 at the inner peripheral portion and the outer peripheral portion of the upper end portion 2c. Since the hot air and the hot air ejected from the small holes 16, 16 are heated substantially uniformly at substantially the same temperature and there is no risk of cooling due to the inflow of outside air, as shown in FIG. Has a so-called tulip shape in which the diameter is expanded to substantially the same diameter, and when a clamp seal is made in this state, a good seal portion is formed, and there is no product defect in which the seal portion of the conventional example spreads laterally. In addition, the seal portion is provided with a good seal without a defective seal or generation of hibaku and puncture.

Further, the high temperature exhaust gas that has heated the upper end portion 2c of the resinous tube 1 in the seal portion heating device 12 is sent from the high pressure blower, and the ejection hole 2
As it is mixed with the high-speed air narrowed by 3 and is rapidly cooled and is discharged at a high speed to the downstream side of the exhaust hole 18, the temperature of each part of the exhaust pipe 17 and the seal part heating device 12 and each device is increased. Therefore, it is possible to prevent the danger and prevent the need for equipment such as a cooling device.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0030]

As described in detail in the above-mentioned one embodiment, the invention according to claim 1 is a resin material for ejecting hot air from a nozzle to heat an end portion which is a clamp seal portion of a resin tube. In the tube seal part heating device, the hot air for heating the inner peripheral part of the end which becomes the clamp seal part of the resin tube from the nozzle and the hot air for heating the outer peripheral part of the end are doubled. Since it jets out, the inner peripheral portion and the outer peripheral portion of the upper end portion of the resin tube are heated to substantially the same temperature by the hot air, so that the upper and lower portions of the upper end portion are expanded to have substantially the same diameter. When the clamp seal is applied in this state, a good seal portion is formed, and there is no occurrence of product defects in which the seal portion of the conventional example spreads laterally. In addition, the seal portion is provided with a good seal without a defective seal, a blister, or a puncture.

Further, the invention according to claim 2 is an apparatus for heating a seal portion of a resin tube, which is configured so that hot air is jetted from a nozzle to heat an end portion of the resin tube, which is a clamp seal portion. The hot air that heats the inner peripheral portion of the end that is the clamp seal portion of the resin tube and the hot air that heats the outer peripheral portion of the end are doubly jetted from the nozzle, and the hot air is exhausted. Since it is mixed with high-speed air introduced from another to be cooled and then discharged, in addition to the effect of the invention of claim 1, it is possible to prevent the exhaust pipe, each part of the seal part heating device, and each device from becoming hot. It is possible to prevent the danger and to eliminate the need for equipment such as a cooling device.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a heating device for a seal portion of a resin tube, showing an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention and is a partially cutaway vertical sectional view after heating a seal portion of a resin tube.

FIG. 3 is a front view of the completed resin tube.

FIG. 4 is a partially cutaway vertical sectional view showing a conventional example and showing a filled state of a resin tube.

FIG. 5 is a partially cutaway vertical sectional view of a heating device for a seal portion of a resin tube, showing a conventional example.

FIG. 6 is a partially cutaway vertical cross-sectional view showing a conventional example and showing a clamp seal state of a resin tube.

FIG. 7 is a partially cutaway vertical sectional view showing a conventional example after heating a seal portion of a resin tube.

FIG. 8 is a front view showing a conventional example after clamp sealing of a resin tube.

FIG. 9 is a partially cutaway vertical sectional view of a heating device for a seal portion of a resin tube, showing another conventional example.

FIG. 10 is a partially detailed vertical sectional view for explaining a heating method by the seal portion heating device of FIG.

FIG. 11 is a partially cutaway vertical sectional view of the resinous tube after being heated by the seal heating device of FIG.

[Explanation of symbols]

1 Resin tube 12 Seal part heating device 13 nozzles w1 hot air w2 hot air w3 high speed wind

Claims (2)

[Claims] 1. A seal heating device for a resin tube, which is configured to eject hot air from a nozzle to heat an end portion of the resin tube that serves as a clamp seal portion.
A resin tube characterized in that hot air for heating an inner peripheral portion of an end portion which is a clamp seal portion of the resinous tube and hot air for heating an outer peripheral portion of the end portion are ejected from the nozzle in a double manner. How to heat the seal part. 2. A seal heating device for a resin tube, which is configured to eject hot air from a nozzle to heat an end portion of the resin tube that serves as a clamp seal portion.
Hot air that heats the inner peripheral portion of the end that is the clamp seal portion of the resin tube and hot air that heats the outer peripheral portion of the end are doubly jetted from the nozzle, and the hot air is exhausted by other means. Mixed with high-speed air introduced from
A method for heating a seal portion of a resin tube, which comprises discharging the resin tube.