JP3709593B2 - Synthetic resin tube manufacturing method and manufacturing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin tube manufacturing method and a manufacturing apparatus for manufacturing a body portion of a tube container, and more specifically, a synthetic resin tube manufacturing method using a sheet made of metal, paper, synthetic resin, or the like as a raw material. And a manufacturing apparatus.
[0002]
[Prior art]
A conventional apparatus for forming a sheet into a cylindrical shape is shown in FIG. In this apparatus, the sheet 50 is wound around the surface of a mandrel 51, the side edges of the sheet 50 are overlapped, and heat welding is performed. That is, the side edges of the stacked sheets 50 are sandwiched between the outer metal upper belt 52 and the inner metal lower belt 53 that travel together, and the heating device 54 and the heat retaining / pressurizing device 55 side. The edges are welded together and further cooled and solidified by the cooling devices 56 to 58. Conventionally, in order to facilitate separation of the metal belt and the product, a fluororesin such as polytetrafluoroethylene or a tape is adhered to the surface of the metal belt on the side in contact with the sheet 50. If only the metal belt is heated and the side edges are bonded to each other without coating such resin or bonding the tape, the product will not be easily separated, and the metal belt will be subjected to a temperature load, which will cause early Had the disadvantage of wear.
[0003]
[Problems to be solved by the invention]
However, a fluororesin is coated, or in the case of a metal belt adhered tape, when used repeatedly coating layer of a fluorine resin is peeled, there is a problem that adheres to the product becomes garbage.
[0004]
The present invention has been made paying attention to such a conventional problem, and even when used for a long period of time, the metal belt does not deteriorate due to a temperature load, and dust due to peeling of the coating layer does not adhere. An object of the present invention is to provide a method and an apparatus for producing a synthetic resin tube.
[0005]
In order to solve this problem, the manufacturing method of the present invention has a loop-shaped synthetic resin sheet wound around the outer periphery of a mandrel, side edges are overlapped with each other, and the overlapped portion travels in the longitudinal direction of the synthetic resin sheet. In the method of manufacturing a synthetic resin tube which is thermally welded while being pressed with a metal belt, and then cooled, the loop-shaped metal belt is supported from below by a support base, and the supported metal belt while applying a release agent directly with a release agent coating means on the upper surface, superimposed side edges between the pressure in a metal belt of said synthetic resin tube, is characterized in that the crimping. The manufacturing apparatus of the present invention, the synthetic and the mandrel provided along the travel position of the resin sheet, loop-shaped metal heat welding while pressurizing the side edges of the synthetic resin sheet superimposed wound on 該Ma Ndoreru In a synthetic resin tube manufacturing apparatus provided with a belt made from a belt and a cooling means for cooling a heat-welded side edge, a support base that supports the loop-shaped metal belt from below and a support base that is supported by the support base A release agent supply means for directly applying the release agent to the upper surface of the metal belt is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. 1 is a schematic front view showing one embodiment of the manufacturing apparatus of the present invention, FIG. 2 is a schematic front view showing another embodiment of the manufacturing apparatus of the present invention, and FIG. 3 is shown in FIGS. 4 is an enlarged front sectional view (a) and an enlarged side sectional view (b), FIG. 4 is a sectional view taken along the line BB in FIG. 1, FIG. 5 is a sectional view taken along the line CC in FIG. These are drawings which each show the DD sectional expanded sectional view of FIG.
[0007]
The production method and production apparatus of the present invention is characterized in that the release agent supply means 1 is provided in the vicinity of a metal belt. As an embodiment, FIG. 1 shows that the release agent supply means 1 is provided on the upper metal belt 8, and FIG. 2 shows that the release agent supply means 1 is provided on the upper metal belt 8 and the lower metal belt 9. An example will be shown. As shown in FIGS. 1 and 3, the release agent supply means 1 includes a tank 2 in which the release agent is stored, an electric valve 3 that supplies the release agent from the tank 2, a supply pipe 4, and a tank 2. The funnel 5 receives the supplied release agent, the drip case 6 to which the funnel 5 is fixed, and the application body 7 attached to the lower side of the drip case 6. As shown in FIG. 3, the funnel 5 is fixed to the drip case 6 by screwing means or the like, and the drip case 6 is pressed and supported on the support base 11 by a side guide rod 6a. The release agent supplied from the supply pipe 4 passes through the funnel 5 and is supplied to the application body 7 attached to the lower side of the drip case 6. The release agent is directly applied onto the upper metal belt 8 by the applying body 7. A suitable release agent is a mixture of a fluorine compound and a solvent. In addition, when the release agent is applied to the upper metal belt 8 and the lower metal belt 9, a support base 11 is provided to support the metal belt from below, and the support base 11 cools the metal belt. It may be a cooling device.
[0008]
Next, the outline | summary of the manufacturing apparatus of this synthetic resin tube is demonstrated. 1 and 2, a synthetic resin tube manufacturing apparatus includes a known mandrel 13 for winding a synthetic resin sheet (raw material) 12 serving as a tube material, and the right direction of the drawing along the upper surface of the mandrel 13. , Travels to the left along the lower surface side of the mandrel 13, travels to the left along the lower surface of the mandrel 13, and travels to the other guide pulley 15, drive pulley 16, tension pulley 17, and other guide pulleys 18, 19. And a loop-shaped lower metal belt (inner belt) 9 that returns to the original state. Further, on the upper side from the middle part of the mandrel 13 to the right side, it is guided by three guide pulleys 20, 21, 22 and a drive pulley 23 and a tension pulley 24 and is arranged in a rectangular loop shape. A metal belt 8 is provided.
[0009]
A heating device 25 is provided between the guide pulley 19 of the lower metal belt 9 and the guide pulley 20 of the upper metal belt 8. Further, between the guide pulleys 20 and 21, a heat retaining / pressurizing device 26, a primary cooling device 27, a secondary cooling device 28, and a tertiary cooling device 29 are provided in that order. The heat retaining / heating device 26 and the cooling devices 27 to 29 (cooling means 35) are pressed downward by the urging means such as air cylinders 30 to 33 or a spring body, respectively, and the upper metal belt 8 itself is made of synthetic resin. It is pressed against the sheet 12. Further, as shown in FIGS. 5 and 6, the mandrel 13 has a columnar shape with shallow grooves 9a and 9b for guiding the lower metal belt 9 on the upper and lower surfaces, and the root portion of the mandrel 13 is a frame of the apparatus. Is fixedly supported. The tip side of the mandrel 13 is normally free. The upper metal belt 8 and the lower metal belt 9 may be known ones.
[0010]
The heating device 25 is for heating and melting the welding surface of the synthetic resin sheet 12. In the embodiment, the heating device 25 includes a heating plate 34. As shown in FIG. 4, the heating plate 34 is a synthetic resin sheet. The outer side edge part inner surface 12a of the outer side 12 and the inner side edge part outer surface 12b can be heated and melted simultaneously. The heat retaining / pressurizing device 26 keeps the melted bonded portion from cooling, or applies a little heat as needed to press-bond the side edges 12a and 12b with the urging force of the air cylinder 30. . Further, the cooling devices 27 to 29 (cooling means 35) cool the synthetic resin sheet 12 pressurized by the heat retaining / pressurizing device 26 to 30 ° or less via the upper metal belt 8. Each cooling device may use a known device such as a water cooling type. Needless to say, the application of the release agent supplying means 1 according to the present invention is not limited to the embodiment of the present invention, and can be applied to other manufacturing apparatuses using a metal belt.
[0011]
Next, the operation of the present invention will be described. In the embodiment of FIG. 1, the release agent supplied to the surface of the upper metal belt 8 and the application body 7 attached to the lower side of the drip case 6 is applied to the upper surface of the upper metal belt 8 that is moved by a pulley. It is applied repeatedly. In the embodiment of FIG. 2, a release agent is similarly applied to the surface of the lower metal belt 9 in addition to the upper metal belt 8. By applying a release agent to both the upper metal belt 8 and the lower metal belt 9, the metal belt 10 and the product can be more easily separated from each other, and the Teflon layer is eliminated. It is not necessary to heat more than necessary, and the surface finish of the synthetic resin tube is good.
[0012]
【The invention's effect】
As described above, according to the present invention, since the release agent is applied to the metal belt, there is little deterioration due to the temperature load even if it is used for a long time, and the metal belt is synthesized as in the past. Since the resin is not coated, the synthetic resin is peeled off, and there is an effect that there is no possibility of adhering to the product.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing an embodiment of a synthetic resin tube manufacturing apparatus according to the present invention.
FIG. 2 is a schematic front view showing another embodiment of the synthetic resin tube manufacturing apparatus according to the present invention.
3 is an enlarged front cross-sectional view (a) and an enlarged side cross-sectional view (b) of a part A in FIGS. 1 and 2. FIG.
4 is an enlarged view taken along line BB in FIG. 1;
5 is a cross-sectional view taken along line CC in FIG.
6 is an enlarged sectional view taken along the line DD of FIG.
FIG. 7 is a schematic front view showing a conventional synthetic resin tube manufacturing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Release agent supply means 10 Metal belt 12 Synthetic resin sheet 12a Side edge part 12b Side edge part 13 Mandrel 35 Cooling means

Claims (5)

A belt-shaped synthetic resin sheet is wrapped around the outer periphery of the mandrel and the side edges are overlapped, and the overlapped portion is heat welded while being pressed with a looped metal belt that runs in the longitudinal direction of the synthetic resin sheet, and then cooled. In the synthetic resin tube manufacturing method
While supported by the support base of the loop-shaped metal belt from below, while applying a release agent directly with the upper surface release agent application means of the metal belt which is supported,
Superimposed side edges between the pressure in a metal belt of said synthetic resin tube, a manufacturing method of a synthetic resin tube, characterized by crimping. The method for producing a synthetic resin tube according to claim 1, wherein the support base is a cooling device that cools the metal belt, and the metal belt is cooled by the cooling device while applying the release agent to the metal belt. The method for producing a synthetic resin tube according to claim 1, wherein the release agent is a mixture of a fluorine compound and a solvent. And the mandrel provided along the travel position of the synthetic resin sheet, and the metal belt loop for heat welding while pressurizing the side edges of the synthetic resin sheet superimposed wound on 該Ma Ndoreru, heat welded side In the synthetic resin tube manufacturing apparatus provided with a cooling means for cooling the edge ,
A support for supporting the looped metal belt from below;
Apparatus for manufacturing a synthetic resin tube, wherein the was set only a release agent supplying means for applying the top surface to the release agent of the supported metal belt directly in the support base. The synthetic resin tube manufacturing apparatus according to claim 4, wherein the support base is a cooling device for cooling the metal belt.

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