JPH0820655A - Surface melting treatment equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the variation in the surface melting treatment effect on the object to be treated. The surface melting treatment apparatus is provided with a conveying means for conveying the object to be treated B such as a conveying conveyer, a hot air supplying means such as a combustion furnace 32, and a hot air blowing section 20 such as blowing ports 52, 54. There is. An oblique direction including an oblique direction blowing nozzle 60 or the like for blowing hot air toward the object to be processed B in an oblique direction toward the downstream side with respect to a direction orthogonal to the transport direction of the object to be processed B in at least a part of the hot air blowing section. Has an outlet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface melt processing apparatus, and more particularly to a surface melt processing apparatus for heating and melting the surface of an object to be processed which is a thermoplastic resin molded product.

[0002]

2. Description of the Related Art When painting or coating a thermoplastic resin molded article or applying an adhesive, if the surface of the thermoplastic resin molded article is heated and melted in advance and then immediately cooled, It is known that the surface properties of a plastic resin molded product change and the bondability of a coating film such as a coating film increases. Such a treatment is called a surface melting treatment. Further, when performing corona discharge treatment or primer treatment as a pretreatment for coating or coating, if the surface melting treatment is performed before these pretreatments, the treatment effect such as corona discharge treatment is enhanced, As a result, it is also known that the bondability of the coating film is further improved.

As an apparatus used for such surface melting treatment, a technique disclosed in Japanese Patent Laid-Open No. 6-107825 is known. This technique is a technique in which an object to be processed is conveyed in a certain direction by a conveyer and passed through a dome-shaped hot air blowing section. The hot air blowing unit is provided with a slit-shaped hot air blowing port that surrounds the outer periphery of the object to be processed. Hot air is blown from the hot air outlet toward the object to be processed, and the surface of the object to be processed is heated and melted by the hot air.

In the surface melting treatment, the thickness of the surface layer of the object to be heated and melted is desired to be as thin as possible within the range where the desired effect of improving the surface properties can be achieved. This is because if the thickness of the surface layer to be heated and melted is excessively large, the object to be treated may be thermally deformed or the surface properties may be adversely affected.

[0005]

The above-mentioned prior art has a problem that it is difficult to uniformly perform the surface melting treatment on the entire surface of the object to be treated, and the effect of the surface melting treatment tends to vary. In the above apparatus, since hot air is blown from the direction orthogonal to the transport direction of the object to be processed, the surface of the object to be processed, which is on the rear side in the direction of transportation, is not exposed to the hot air. It is difficult to heat the portion where the hot air is weak, the surface temperature of the portion does not rise, and heating and melting cannot be performed sufficiently. Further, when the shape of the object to be processed becomes complicated not only on such a rear side surface, it is difficult to uniformly heat the entire object to be processed only by the hot air from the direction orthogonal to the transport direction as described above. .

Further, when the hot air outlets are provided in a plurality of directions surrounding the periphery of the object to be processed, the hot air blown out from the plurality of hot air outlets interfere with each other to change the air blow direction or the wind velocity of the hot air. Will decrease. This also causes variations in the effect of the surface melting treatment. An object of the present invention is to reduce variations in the surface melting treatment effect on an object to be treated.

[0007]

A surface melting treatment apparatus according to the first invention is a surface melting treatment apparatus for heating and melting the surface of an object to be treated made of a thermoplastic resin molded article, which comprises a conveying means and a hot air supply. It is provided with a means and a hot air blowing part. The carrying means carries the object to be processed. The hot air supply means supplies hot air. The hot air blowing unit has a diagonal blowout port at least in part. The oblique air outlet blows hot air from the hot air supply means toward the object to be processed in an oblique direction toward the downstream side with respect to the direction orthogonal to the conveyance direction of the object to be processed.

The hot air blowing section may further have a reverse oblique direction blowout opening. The reverse oblique direction outlet blows out hot air from the hot air supply means toward the object to be processed in an oblique direction toward the upstream side with respect to the direction orthogonal to the conveyance direction of the object to be processed. A surface melting treatment apparatus according to a second invention is a surface melting treatment apparatus for heating and melting a surface of an object to be treated made of a thermoplastic resin molded article,
It is provided with a conveying means, a hot air supply means, and a hot air blowing section. The transport means transports the object to be processed. The hot air supply means supplies hot air. The hot-air blowing unit has a cross-flow outlet and a diagonal nozzle. The orthogonal air outlet blows hot air from the hot air supply means toward the object to be processed in a direction orthogonal to the conveying direction of the object to be processed. The diagonal nozzle is
The hot air from the hot air supply means is blown toward the object to be processed in an oblique direction toward the downstream side or the upstream side with respect to the direction orthogonal to the conveying direction of the object to be processed, which is detachably attached to the tip of the orthogonal air outlet. .

The hot air blowing section may further include an air volume adjusting means. The air volume adjusting means may be a perforated plate. A surface melting treatment apparatus according to a third aspect of the present invention is a surface melting treatment apparatus for heating and melting the surface of an object to be treated made of a thermoplastic resin molded article, which comprises a conveying means, a hot air supply means, and a hot air blowing section. There is.
The carrying means carries the object to be processed. The hot air supply means supplies hot air. The hot air blowing unit has a first blowout opening and a second blowout opening. The first outlet blows hot air from the hot air supply means onto the object being processed by the transfer means from the first direction around the object. The second air outlet blows hot air from the hot air supply means onto the object to be processed from a second direction different from the surrounding first direction at a position different from the first air outlet in the conveying direction by the conveying means.

The first blowing port blows hot air onto the object to be processed from one obliquely upper side, and the second blowing port blows hot air to the object to be processed from the other obliquely upper side. Can be

[0011]

In the surface melting treatment apparatus according to the first aspect of the invention, at least a part of the hot air blowing unit applies the hot air to the object to be processed in an oblique direction toward the downstream side with respect to the direction orthogonal to the conveying direction of the object to be processed. It is equipped with a diagonal outlet that blows out toward you. When the hot air blown out from the oblique outlet hits the surface that is on the rear side with respect to the transport direction of the object to be processed, the motion component of the hot air in the transport direction compensates for the decrease in the strength of the hot air hit by the movement of the object to be processed. It will be. Therefore, hot air of sufficient strength can be applied to the rear surface, and the variation in the surface melting treatment effect on the object to be treated can be reduced.

If the hot air blowing section is further provided with the above-mentioned reverse oblique direction blow-out port, by combining with the above-mentioned oblique direction blow-out line, it is possible to provide various locations for the objects having various three-dimensional shapes. Hot air having an appropriate strength can be applied from an appropriate direction, and the variation in the surface melting treatment effect on the object to be treated can be further reduced.

In the surface melting treatment apparatus according to the second aspect of the present invention, since the hot air blowing section has the orthogonal outlets and the diagonal nozzles, the hot air blowing direction can be changed by attaching and detaching the diagonal nozzles. It can be easily changed, and suitable hot air can be easily blown according to the shape and structure of the object to be processed, and variations in the surface melting treatment effect on the object to be processed can be reduced.

If at least a part of the hot air blowing section is further provided with an air flow rate adjusting means, it is possible to adjust the air flow rate of the hot air blown out from the orthogonal air outlet or the oblique nozzle attached to the orthogonal air outlet. If the air volume of the hot air changes, the intensity of the hot air hitting the object to be processed or the heating temperature also changes, so that the variation in the surface melting treatment effect on the object can be further reduced.

When the air flow rate adjusting means is a perforated plate, the air flow rate can be changed by passing hot air through the perforated plate, and the air flow rate can be properly adjusted with a simple structure. In the surface melting treatment apparatus according to the third aspect of the present invention, the hot air blowing unit has the first blowout port and the second blowout port, and the first blowout port and the second blowout port are different in the carrying direction by the carrying means. Since hot air is blown onto the object to be processed from different directions at different positions, the hot air blown from different directions is less likely to interfere with each other, and the wind speed of the hot air does not decrease or the direction of the hot air does not change. As a result, it is possible to efficiently heat the object to be treated with hot air from different directions, and reduce the variation in the surface melting treatment effect on the object to be treated.

The first blowing port blows hot air onto the object to be processed from one obliquely upper side, and the second blowing port blows hot air to the object to be processed from the other obliquely upper side. If so, hot air can be efficiently blown to the object to be processed, and the variation in the surface melting treatment effect on the object to be processed can be further reduced.

[0017]

EXAMPLE The surface melting treatment apparatus shown in FIG.
A thermoplastic resin molded product that serves as an automobile bumper is used as. The object to be processed B is placed on the loading table 12 and conveyed on the conveyor 14. The object to be processed B is conveyed with its front side facing upward when used as a bumper, with its longitudinal direction aligned with the conveying direction.

A gate-shaped hot air blowing section 20 surrounding the transfer conveyor 14 is installed in the middle of the transfer conveyor 14. A hot air supply duct 30 is provided above the hot air blowing unit 20.
Are connected. The hot air supply duct 30 is connected to a combustion furnace 32, and the combustion furnace 32 is equipped with a gas burner 34. A blower fan (not shown) is provided in the middle of the hot air supply duct 30. In the gas burner 34, through a gas pipe 36, a pressure regulating valve 37, a vaporizer 39,
The LPG gas cylinder 38 is connected. An intake duct 40 is connected to a lower portion of the hot air blowing unit 20, and the intake duct 40 is connected to the combustion furnace 32.

As shown in FIGS. 2 and 3, in the central space of the hot air blowing section 20, a gate-shaped outlet unit 5 is provided.
0 is detachably attached with a plurality of bolts b. The hot air supplied from the hot air supply duct 30 to the hot air blowing unit 20 is sent into the internal space of the air outlet unit 50. In addition, the outlet unit 50 is configured such that the left and right L-shaped portions 50a and 50b that are divided and formed are assembled to form an overall gate shape.

On the inner surface side of the air outlet unit 50, there are provided upper air outlets 52 and side air outlets 54, which are open in both sides and upward in a slit shape, in four rows from the front side of the air outlet unit 50 to the back side. Prepared side by side. As shown in FIG. 4, each of the outlets 52 and 54 is tapered from the inside to the outside, and the tip portions thereof are parallel mounting portions 55. In this state, the hot air blown out from the blowout ports 52 and 54 is blown out in the direction orthogonal to the transport direction of the object to be processed B. Therefore, in this state, the outlets 52 and 54 are orthogonal outlets.

A plurality of rows of side outlets 5 shown in FIG. 4 (a)
4, the outlets 54 located at both ends of the row are fitted with the shielding lids 90 at the mounting portions 55 at the tips. Hot air is not blown out from the air outlet 54 to which the shielding lid 90 is attached. Among the outlets 54 located inside the row of outlets 54, the outlet 54 on the downstream side (upper side in the drawing) along the conveyance direction of the processing object B has the downstream side to the attachment portion 55 at the tip. A facing diagonal nozzle 60 is fitted. A reverse oblique direction nozzle 70 facing the upstream side is fitted into a mounting portion 55 at the tip of the outlet port 54 on the upstream side (lower side in the drawing) of the remaining inside. Therefore, the outlet 54 to which the oblique nozzle 60 is attached becomes an oblique outlet, and the outlet 54 to which the reverse oblique nozzle 70 is attached becomes an reverse oblique outlet.

As shown in FIG. 5, the diagonal nozzle 60 and the reverse diagonal nozzle 70 have a tapered shape in which the width becomes narrower from the mounting side to the blowing port 54 toward the tip opening side. Is inclined by an angle θ with respect to the center line direction of, ie, the direction orthogonal to the conveyance direction of the object to be processed B. The inclination angle θ is set to about 15 °. The reverse diagonal nozzle 70 is the diagonal nozzle 6
It can also be configured by mounting a nozzle having the same shape as 0 upside down.

Inside the mounting portion 55 of the outlet 54,
An air flow rate adjusting plate 80 having a U-shaped cross section is attached, which is made of punching metal having a hole of about 6 mmφ formed through the entire surface. The diagonal nozzles 60 and 70 and the air flow rate adjusting plate 80 are detachably attached to the attaching portion 55 with the bolt 62. As shown in FIG. 6, the air volume adjusting plate 8
No. 0 is attached only to a portion of the blowout port 54 extending in the up-down direction in the vicinity of a portion where hot air is blown to the upper surface side of the object to be processed B.

The upper outlet 52 shown in FIG. 4 (b) has a shielding lid for the remaining three outlets 52 except the third outlet 52 from the upstream side in the transport direction of the object to be processed B. 90 is attached. Therefore, hot air is not blown out from these three outlets 52, and
Hot air is blown out only from the second outlet 52. An air volume adjusting plate 80 similar to the above is attached to the third outlet 52. As shown in FIG. 6, the air volume adjusting plate 80 of the upper outlet 52 is attached over almost the entire width.

The operation of the surface melting processing apparatus having the above structure will be described. In FIG. 1, the object to be processed B
May be in a state of being molded by injection molding or the like, and may be subjected to pretreatment such as cleaning or preheating after the molding. The workpiece B is sent to the hot air blowing unit 20 to perform the surface melting treatment. The gas supplied from the LPG gas cylinder 38 is burned by the gas burner 34 to heat the atmosphere in the combustion furnace 32. When the blower fan is operated, the hot air generated in the combustion furnace 32 is supplied to the hot air blowing unit 20.

As shown in FIG. 4, the outlet unit 5
The hot air sent to 0 is blown out from the upper rows 52 of a plurality of rows.
And the side blow-out holes 54 are blown out from the blow-out openings 52, 54 in the open portions. Since the air volume adjusting plate 80 is attached to the open air outlets 52 and 54, hot air whose air volume or speed is controlled by setting the hole diameter and the number of holes of the air volume adjusting plate 80 is blown out.
The air volume adjusting plate 80 also has a function of preventing the flow of hot air from being disturbed and rectifying it in a certain direction.

As shown in FIG. 4 (a), hot air is blown from the upper outlet 52 to the workpiece B conveyed in the direction of the white arrow, that is, in the direction perpendicular to the conveying direction of the workpiece B. Is blown out and hits the object B to be processed. The hot air blown out of the diagonal nozzles 60 in the side air outlets 54 has a motion component in the same direction as the conveyance direction of the object to be processed B. As a result, the back surface of the object to be processed B is also hit with the hot air with sufficient strength. Further, the hot air blown out from the reverse oblique direction nozzle 70 efficiently strikes the front surface of the object to be processed B. The lateral surface of the object to be processed B is sufficiently hit with hot air from both the diagonal nozzle 60 and the reverse diagonal nozzle 70.

As described above, the hot air blown out from each of the air outlets 52 and 54 efficiently contacts any surface of the object to be processed B to heat the surface of the object to be processed B. The surface of the object to be processed B heated to a certain temperature or higher melts. When the object to be processed B has passed the positions of the outlets 52 and 54, the heating of the object to be processed B is finished, and the surface of the object to be processed B in contact with the external atmosphere is cooled.

The hot air blown out from each of the air outlets 52 and 54 is collected in the intake duct 40 from an air inlet (not shown) provided in the floor surface portion of the hot air blowing portion 20, and the hot air leaks to the outside. It's becoming difficult. Preferable processing conditions for performing the above surface melting processing will be described. It is preferable that the temperature of the hot air applied to the object to be processed B is set to a temperature higher by 30 to 250 ° C. than the melting point of the object to be processed B. The hot air velocity is preferably 1 to 50 m / sec.
The time during which hot air is applied to the object B to be processed is preferably 1 to 20 seconds. By adopting such a condition, only the thin layer on the surface of the object to be treated B can be surely heated and melted, and the intended surface property can be improved. Therefore, the gas burner 34 and the combustion furnace 32 of the surface melting treatment device
It is preferable to design the above structure so as to realize the above processing conditions. [Evaluation test] Next, using the surface melting treatment apparatus,
The results of evaluating the performance will be described.

Using a bumper having the structure shown in FIG. 7 as the object B to be processed, the temperatures at points A to F after the surface melting treatment were measured. If the temperature difference between the points A to F is small, it can be determined that the object B to be processed is melted by heating. In addition,
The object B was conveyed such that the point F was at the beginning and the point A was at the rear end, as indicated by the arrow. For comparison, using the same surface melting treatment device, each outlet 5
The same measurement was performed when the configurations of Nos. 2 and 54 were changed as shown in FIG. In FIG. 9, the object B is conveyed in the direction of the white arrow, the state of the upper outlet 52 is shown in the center of the figure, and the state of the side outlet 54 is shown on the left and right of the figure. Of the four rows of upper outlets 52, the outlets 52 at three locations shown by the dotted line are closed by the shielding lid 90, and only the outlet 52 at one location shown by the solid line is open.
Out of the left and right four rows of side outlets 54, two outlets on the upstream side (lower side in the drawing) and three outlets 54 on the downstream side are closed by a shielding lid 90 on each side. Only the outlet 54 at the point is open. No diagonal nozzle 60 is attached to the blowout port 54, and hot air is blown out in a direction orthogonal to the transport direction.

Table 1 shows the measurement results.

[0032]

[Table 1] ────────────────────────────────── Surface temperature ℃ Maximum temperature difference A B C D E F ℃ ────────────────────────────────── Example 170 180 180 190 180 190 180 180 Comparative example 125 150 150 175 175 160 175 50 ────────────────────────────────── The results of the above measurements are compared in the examples of the present invention. It was proved that the temperature difference between the measurement points A to F was smaller than that in the example and the entire surface of the object to be treated B could be heated uniformly.

In the surface melting treatment apparatus of the above-described embodiment, the blowout unit 50 is detachably attached to the hot air blowing unit 20, so that when the shape structure of the treatment object B is changed, the treatment object is treated. It can be easily dealt with by exchanging the hot air outlet unit 50 corresponding to the shape of B. Moreover, the outlet unit 50 is
The upper outlet 52 and the side outlet 54 have the same basic structure, and the diagonal nozzle 60 and the reverse diagonal nozzle 7 have the same structure.
0, the shielding lid 90 and the air volume adjusting plate 80 may be changed to change the hot air blowing conditions arbitrarily.

In the above-mentioned embodiment, since the outlets are composed of the upper outlets 52 and the left and right side outlets 54, the hot air is efficiently supplied to the entire main surface of the workpiece B on the upper surface side and the side surface. Can be sprayed on. In the above-described embodiment, since the outlets 52 and 54 are provided in a plurality of rows along the transport direction, the heating efficiency is improved and the heating of the object to be processed is likely to be uniform, so that the efficiency of the surface melting process can be improved. At the same time, it is possible to further reduce variations in the surface melting treatment effect on the object to be treated.

In the above embodiment, since the punching metal is used as the perforated plate used for the air volume adjusting plate 80, it is easily available and the manufacturing cost is reduced. Next, as shown in FIG. 8, even if the same surface melting treatment apparatus is used, the arrangement of the oblique nozzle 60, the reverse oblique nozzle 70, and the shielding lid 90 is changed to blow hot air onto the object B to be processed. Can be changed in various ways.

In the arrangement example of FIG. 8A, a shielding lid 90 is attached to one of the four rows of the side outlets 54, which is the most upstream side with respect to the conveying direction of the object to be processed B. The reverse oblique direction blowing nozzles 70 are attached to the blowing outlets 54, and the oblique blowing nozzles 60 are attached to the remaining two rows of blowing ports 54. Upper outlet 52
Is the third outlet 52 from the upstream side (represented by the solid line)
Only the opening is opened, and the other outlet 52 (represented by a dotted line) is closed by the shielding lid 90.

In the arrangement example of FIG. 8 (b), among the four rows of side outlets 54, the diagonal outlet nozzles 6 are provided in the two rows of outlets 54 on the upstream side with respect to the conveying direction of the object B to be processed.
0 is attached, the shielding lid 90 is attached to the next outlet 54, and the reverse oblique direction outlet nozzle 70 is attached to the last outlet 54. [Modified Embodiment] (a) The inclination angle θ of the oblique direction blowing nozzle 60, that is, the oblique direction blowing port, is set to match the conditions such as the shape of the object B to be processed, the conveying speed, and the strength of hot air. It should be set so that hot air of appropriate strength can be applied to the required parts. Specifically, the inclination angle θ is 0 to
Set in the range of 45 °. Preferably the tilt angle is 1
Set at 0 to 30 °.

The same inclination angle condition as that of the oblique-direction blowing nozzle can be adopted for the reverse-oblique-direction discharging nozzle 70, that is, the reverse oblique-direction blowing nozzle. (b) In the above embodiment, the outlets 52 and 54 are arranged in four rows along the conveyance direction of the object to be treated, but the number of rows may be less than four rows or more than four rows. Normally, it is preferable to set the number of rows of hot air outlets in the range of 1 to 6 rows. Even when the outlets 52 and 54 of a plurality of rows are provided, by using the shielding lid 90, only the outlets 52 and 54 of an arbitrary place and the number of rows can be used.

(C) In addition to the upper outlet and the side outlets on the left and right sides as the arrangement structure of the outlets, the arrangement structure of the outlets can be changed according to the processing purpose. It is preferable to arrange them in a schematic shape that surrounds the outer shape of the object to be processed. Specifically, the linear outlets can be arranged at diagonally upper left and right positions. It is also possible to employ a curved outlet such as an arc.

(D) The diagonal nozzles and the reverse diagonal nozzles are the nozzles 60, 7 as described above.
Besides using 0, the tips of the outlets 52, 54 themselves may be inclined in an oblique direction. (e) The air volume adjusting means may be arranged inside the tips of the air outlets 52 and 54, or may be provided at any position on the hot air passage path to the air outlets 52 and 54. For example,
An air volume adjusting means is arranged inside the tip of the diagonal nozzle 60 or the reverse diagonal nozzle 70, or the outlet 5
It can be placed inside the air outlet unit 50 at the back of 2, 54.

As the perforated plate serving as the air flow rate adjusting plate 80, in addition to punching metal, a plate material having holes of arbitrary shape or size penetratingly formed can be used. As the air volume adjusting plate 80, in addition to the perforated plate, one having a large number of slits, one having a narrowed flow path, and the like can be used. (f) The surface melting treatment apparatus is the same as that described in the above-mentioned JP-A-6-107.
It can be used for the surface melting treatment method disclosed in Japanese Patent No. 825 and other various surface melting treatments. Object B
In addition to automobile bumpers, various thermoplastic resin moldings that form automobiles, various electric products, and mechanical products can be used. As the thermoplastic resin molded product, one formed by a usual molding method such as injection molding, extrusion molding or the like can be used. As the thermoplastic resin, a polyolefin resin such as polypropylene or polyethylene and other thermoplastic resins are used. [Another embodiment] The surface melting treatment apparatus shown in FIG. 10 uses a thermoplastic resin molded product which is a molding to be attached to the side surface of the body of an automobile as the object M to be treated. The workpiece M is
The transfer conveyor 11 is mounted on the loading table 112 similar to the above.
4 is transported. The object M to be processed is conveyed with its front side facing upward when used as a molding and with its longitudinal direction aligned with the conveying direction.

A hot air blowing section 120 is arranged above the transport conveyor 114. Hot air blowing part 12
The hot air supply duct 130 is connected to the upper part of 0, and the hot air supply duct 130 is connected to the hot air generator 132.
The hot air blowing unit 120 is supported by the hot air generator 132 via the hot air supply duct 130. The hot air generator 132 includes an electric heater and a blower fan driven by a motor, heats the air taken in from an air intake 134 provided at the end of the hot air generator 132, and heats the hot air supply duct 130 with hot air. Send out. Hot air generator 132
Is the support leg 13 installed across the transfer conveyor 114.
It is installed on top of 6.

As shown in FIG. 11, the hot air blowing section 12
A left outlet 122 and a right outlet 124 are opened below 0 in front of and behind the conveying direction. The left outlet 122 is opened diagonally above and to the left of the object M to be processed. Hot air is blown toward the object M to be processed from the left outlet 122 in an obliquely downward direction. Right outlet 124
Has an opening to the upper right of the object M to be processed, and blows hot air toward the object M to be processed obliquely downward.

The operation of the surface melting treatment apparatus having the above structure will be described. As shown in FIG.
The object M to be processed that has been conveyed over the hot air blowing unit 12
When it comes below 0, the hot air blown from the left and right outlets 122 and 124 is blown to the object M to be processed. In the front view shown in FIG. 11 (b), the hot air blown out from the left and right outlets 122, 124 is blown out so as to intersect with each other, but as can be seen from the plan view shown in FIG. Since the hot air blown from the openings 122 and 124 is separated from each other in the front and rear, it is possible to prevent both hot air from hitting and interfering with each other. That is, the left and right outlets 122, 12
4 blows hot air in different directions at different positions in the carrying direction.

In the above-described embodiment, since the entire object M to be processed can be heated by the hot air outlets 122, 124 in two directions which blow out hot air from the left and right diagonal directions, the upper and left and right sides can be heated as in the above embodiment. The structure is simpler than the structure in which hot air is blown from the three lateral directions. [Modified embodiment] (a) In addition to the left and right outlets 122 and 124, the first and second outlets for blowing hot air from different directions at different positions in the conveying direction toward the object to be processed It is also possible to appropriately combine and use the oblique outlets, the reverse oblique outlets, the orthogonal outlets of the embodiments shown in FIGS. Specifically, in FIG.
The row to be opened at the upper outlet 52 and the row to be opened at the side outlet 54 may be different in the front and rear.

(B) The processing conditions such as the temperature of hot air, the amount of air, and the contact time can be the same as those in the above-mentioned embodiment. (c) The intersecting angle of the hot air blowing direction between the first outlet 122 and the second outlet 124 may be any intersecting angle other than the intersecting angle of 90 ° as in the illustrated embodiment. . The front and rear spaces between the first outlet 122 and the second outlet 124 may be separated so that the interference of hot air blown in different directions can be sufficiently prevented.

(D) As the air outlets, two air outlets, that is, a first air outlet and a second air outlet, are combined, and three or more air outlets are blown with hot air in different directions at different positions. It can also be arranged so that it blows out.

[0048]

In the surface melting treatment apparatus according to the first aspect of the present invention described above, since the hot air blowing section is provided with the oblique blow-out port as described above,
Conventionally, it is possible to perform appropriate heating and melting treatment by applying hot air of sufficient intensity to the surface of the object to be processed, which is on the rear side with respect to the transport direction, which has been difficult to perform appropriate heating. As a result, it is possible to reduce variations in the surface melting treatment effect on the object to be treated.

If the hot air blowing section is further provided with the above-mentioned reverse oblique direction air outlet, it is possible to apply hot air of appropriate strength from an appropriate direction to objects to be processed having various three-dimensional shapes. Therefore, it is possible to further reduce the variation in the surface melting treatment effect on the object to be treated. In the surface melting treatment apparatus according to the second aspect of the present invention, since the hot air blowing unit has the orthogonal outlets and the diagonal nozzles, it is possible to blow hot air appropriately according to the shape structure of the object to be treated. This can be easily performed, and variations in the surface melting treatment effect on the object to be treated can be reduced.

If at least a part of the hot air blowing section is further provided with an air volume adjusting means, the intensity of the hot air hitting the object to be processed or the heating temperature can be adjusted, and the dispersion of the surface melting treatment effect on the object to be processed can be adjusted. It can be further reduced. If the air volume adjusting means is a perforated plate, the air volume can be appropriately adjusted with a simple structure.

In the surface melting treatment apparatus according to the third aspect of the present invention, the hot air blowing section has the first blow-out port and the second blow-out port, so that hot air from different directions can efficiently treat the object to be treated. It is possible to heat the material to be processed, and it is possible to reduce variations in the surface melting treatment effect on the object to be treated. In addition, if the first outlet blows hot air from one diagonally upper side to the object to be treated, and the second outlet blows hot air from the other diagonally upper side to the object to be treated, Hot air can be efficiently blown to the object to be treated, and the variation in the surface melting treatment effect on the object to be treated can be further reduced.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a surface melting processing apparatus showing an embodiment of the present invention.

FIG. 2 is a front view of an outlet unit.

FIG. 3 is a sectional view of the above.

FIG. 4 shows a detailed structure of an outlet, (a) is a sectional view of a side outlet, and (b) is a sectional view of an upper outlet.

FIG. 5 is an enlarged sectional view of a diagonal outlet.

FIG. 6 is a schematic cross-sectional view showing an arrangement structure of an air volume adjusting plate viewed from the front of the outlet unit.

FIG. 7 is a perspective view of a bumper used in the evaluation test.

FIG. 8 is an arrangement structure diagram of the outlets showing an embodiment in which the arrangement structure of the outlets is different.

FIG. 9 is a layout structure diagram of outlets representing a comparative example.

FIG. 10 is a perspective view of a surface melting processing apparatus showing another embodiment.

FIG. 11 shows a detailed structure of a hot air blowing part, (a) is a plan layout view, and (b) is a sectional structure view as seen from the front.

[Explanation of symbols]

 12, 112 Loading platform 14, 114 Conveyor 20, 20 Hot air blowing part 30, 130 Hot air supply duct 50 Air outlet unit 52, 54 Air outlet 60 Diagonal direction air jet nozzle 70 Reverse oblique direction air jet nozzle 80 Air volume adjustment plate 90 Shield lid B , M Processing object

Claims (7)

[Claims] 1. A surface melting treatment apparatus for heating and melting a surface of an object to be treated, which is a thermoplastic resin molded article, comprising: a conveying means for conveying the object to be treated; a hot air supply means for supplying hot air; Hot air blowing having an oblique direction blowing port that blows out hot air from the hot air supply means toward the object to be processed in an oblique direction toward the downstream side with respect to a direction orthogonal to the conveyance direction of the object to be processed. And a surface melting treatment apparatus. 2. The hot air blowing section blows hot air from the hot air supply means to the object to be processed in an oblique direction toward the upstream side with respect to the direction orthogonal to the conveying direction of the object to be processed. It also has a diagonal outlet.
The surface melting treatment apparatus according to claim 1. 3. A surface melting treatment apparatus for heating and melting a surface of an object to be treated which is a thermoplastic resin molded article, comprising: a conveying means for conveying the object to be treated; a hot air supply means for supplying hot air; An orthogonal blow-out port that blows out hot air from the hot-air supply means toward the object to be treated in a direction orthogonal to the direction in which the object to be treated is conveyed, and the object to be treated is detachably attached to the tip of the orthogonal blow-out port. A hot air blowing section having a diagonal nozzle that blows hot air from the hot air supply means toward the object in a diagonal direction toward the downstream side or the upstream side with respect to the direction orthogonal to the direction, and a surface provided with Melt processing equipment. 4. The surface melting treatment apparatus according to claim 1, wherein the hot air blowing section is further provided with an air volume adjusting means. 5. The surface melting treatment apparatus according to claim 4, wherein the air flow rate adjusting means is a perforated plate. 6. A surface melting treatment apparatus for heating and melting a surface of an object to be treated which is a thermoplastic resin molded article, comprising: a conveying means for conveying the object to be treated; a hot air supplying means for supplying hot air; The first blowing outlet that blows out hot air from the hot air supplying means to the object to be processed from the first direction around the object to be processed being conveyed by the conveying means, and the first outlet is the conveying. A hot air blowing section having a second blowing port that blows hot air from the hot air feeding means onto the object to be processed from a second direction different from the first direction around the periphery at a position different from the first direction by the means,
Surface melting treatment equipment equipped with. 7. The first blowing port blows the hot air onto the object to be processed from one diagonally upper side, and the second blowing port blows the hot air from the other diagonally upper side to the object to be processed. 7. The surface melting treatment apparatus according to claim 6, which blows out.