JP3759725B2 - End treatment method for hollow substrate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, an upright wall forming member for forming a plurality of upright walls made of the same kind of thermoplastic resin is provided between the front and back liners made of a thermoplastic resin, whereby most of the hollow portions are formed between the front and back liners. The present invention relates to a terminal treatment method for a hollow base material on which a formed core is formed.
[0002]
[Prior art]
As such a hollow base material, there is a resin cardboard board, what is called a so-called dumper. This resin corrugated cardboard is characterized by the fact that most of the interior between the liners is hollow, so that the apparent thickness of the entire hollow base material can be increased and the bending rigidity can be increased while being lightweight. Therefore, taking advantage of this feature, it has been conventionally used as a floor covering of an automobile trunk room. An example of using a resin cardboard in this way is described in Patent Document 1, for example. In this publication, resin cardboard is used as an underlay sheet for a trunk, and it is disclosed that a crease is provided in the width direction.
[0003]
When used as an automobile floor covering, it is suitable to apply a non-woven fabric or other skin material on at least one surface of the resin cardboard, thereby avoiding the resin surface being exposed. The design of the interior can be improved. As disclosed in Patent Document 2, as a method of attaching the skin material to the surface of the resin corrugated board, the skin material is thermally bonded using the melting heat of the surface layer in the process of forming the resin corrugated board. It is reasonable to do so and is widely implemented.
[0004]
Such a resin cardboard board is pierced and cut into a shape substantially along the trunk room of an automobile. At this time, when the resin cardboard is simply cut, there is no liner on the cut edge surface, and the base resin is exposed. Therefore, even if a resin corrugated cardboard base material with a skin material stuck on one or both sides as described above is used, the surface or the back surface is covered with the skin material, but the base material exposed on the edge surface Due to the resin, there may be a problem that the designability is lowered.
[0005]
As a method for solving this problem, methods for processing the edge surface as described above in a state covered with a liner are disclosed and proposed in Patent Documents 3 to 6. The schematic diagram for explaining the disclosed processing method in these publications are shown in Figures 2-5. Each drawing shows a cross-sectional view showing each processing step in time series.
[0006]
In the method disclosed in Patent Document 3, as shown in FIG. 2 , the terminal of the resinous cardboard 30 is crushed by the heat bar 31 on the receiving base 32 to form a single plate, and then the resinous cardboard 30. It is bent and welded to the end face side.
[0007]
In the method disclosed in Patent Document 4, as shown in FIG. 3 , the upper part of the end of the resinous cardboard 30 is melted and melted by a blade-shaped heat bar 41, and the thermally fused terminal of the resinous cardboard 40 is removed. It is welded to the end face.
[0008]
In the method disclosed in Patent Document 5, as shown in FIG. 4 , first, the resin cardboard 50 is moved from the side edge of the table 51 to the side of the vertical slide member 52 arranged adjacent to the table 51. It is placed on the table 51 so as to protrude by a predetermined amount. Thereafter, the hot blade 53 whose apex angle of the blade edge is 60 ° to 90 ° is gradually lowered to soften and melt the portion around the hot blade 53 of the resin corrugated cardboard 50 to raise the hot blade 53 and to move the upper and lower slide members 52. And the portion of the resinous cardboard 50 that protrudes from the table 51 is bent and fused to the end face of the resinous cardboard 50.
[0009]
The method disclosed in Patent Document 6 is different from the method of construction of Netsuha 63 used is disclosed in Patent Document 5, this Netsuha 63, as shown in FIG. 5, the end portion of the resinous cardboard 50 Is heated and crushed to a predetermined thickness, and cut into a predetermined length to form a cover, and this cover is bent and fused to the end face of the resin cardboard 50.
[0010]
[Patent Document 1]
Japanese Utility Model Publication No. 59-14280 (Japanese Utility Model Application No. 54-128712)
[Patent Document 2]
Japanese Patent Publication No. 60-49106 (Japanese Patent Application No. 53-139356)
[Patent Document 3]
Japanese Utility Model Publication No. 61-21228 (Japanese Utility Model Application No. 56-115787)
[Patent Document 4]
Japanese Patent Laid-Open No. 5-124140 (Japanese Patent Application No. 3-315158)
[Patent Document 5]
Japanese Patent No. 3159903 (Japanese Patent Application No. 7-261992)
[Patent Document 6]
Japanese Patent Laid-Open No. 2001-18308 (Japanese Patent Application No. 11-196377)
[0011]
[Problems to be solved by the invention]
In the above-described prior art, the end face of the resinous cardboard is covered with a member obtained by heating and crushing the liner or the standing wall forming member. At this time, the member covering the end face of the resinous cardboard has been subjected to excessive heat crushing, that is, until the front and back liners and the standing wall forming member are substantially the thickness of one liner. For this reason, if the end surface is covered with this member, a burr may be formed in that part, and there arises a problem that a post-treatment for deburring is required in order to finish it with a good appearance. In particular, when a resin corrugated cardboard is laid in a trunk room having a complicated shape, when the cardboard is cut into a curved shape with a large curvature, the bent side is distorted, and burrs are easily generated.
[0012]
Further, as in the prior art, when the front and back liners and the standing wall forming member are processed into a plate-like member by heat crushing and bent to cover the end surface, the bending margin of the plate-like member becomes thick and hard. This may cause a problem that bending is difficult.
[0013]
The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a hollow substrate terminal treatment that is unlikely to generate burrs and can be finished nicely without post-processing. It is to provide a method.
[0014]
[Means for Solving the Problems]
To achieve the above object, the present invention, the terminal processing method of the hollow substrate, and sides of the liner comprising a thermoplastic resin, to form a plurality of vertical wall between said liner, vertical wall made of a thermoplastic resin formed and a member, a method for processing a number of the terminals of the hollow substrate core is formed with a hollow portion between the liner, to the outside from a direction parallel to the front and back of the liner of the hollow substrate insert the heating element between the liner sides, a step of pushing into the inside of the hollow substrate while softening and melting the standing wall forming member edge vicinity of at least the hollow substrate, then the table or the back of one of said liner, said standing wall forming member bending the terminal portions was removed by pushing inwardly in a direction to cover the edges in a direction along the edge of the hollow base, said the one of the liner and the other Hit the liner Characterized by a step of cutting the front and back of the liner at the same position in the hit portion.
[0015]
The terminal processing method of the present invention, finally never liner covering the terminal of the hollow substrate is thermally crushed, and because is nor directly heated the surface, even without post-treatment, The terminal of the hollow substrate can be finished with a good appearance. In addition, this terminal processing method has an advantage that the number of steps can be relatively reduced and the processing apparatus can also have a relatively simple configuration.
[0016]
In the terminal processing method, the liner, the bent portion, can be fused to standing wall forming member which is softened and melted, whereby it is possible to secure the folded liner.
[0017]
Terminal structure that is processed by the terminal processing method as above SL is the edge of the hollow substrate, without thermal crush, has a structure covered by simply bent by the liner.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0019]
Figure 1 is a schematic diagram showing a terminal processing method implementation of the invention is shown in time series (a) ~ (f) processing steps.
[0020]
The hollow base material 5 to be treated in the present embodiment includes front and back liners 1a and 1b made of a thermoplastic resin, and standing walls made of the same kind of thermoplastic resin as the liners 1a and 1b, which form a plurality of standing walls therebetween. A core having a hollow portion is formed between the liners 1a and 1b by the standing wall forming member 2. As the thermoplastic resin to be used, a polypropylene resin that can be processed at a relatively low temperature and has excellent durability is suitable. The liners 1a and 1b have a thickness of about 1 mm, the core has a thickness of several mm to several tens of mm, and the shape of the standing wall forming member 2 is a hollow columnar or honeycomb shape that forms many hollow portions in the core. Is suitable. The hollow base material 5 is formed into a continuous plate shape by, for example, a manufacturing method described in Patent Document 2, and at the same time, a skin material (not shown) is simultaneously formed on the surfaces of the front and back liners 1a and 1b. ).
[0021]
Nonwoven fabric is most suitable as the skin material, but other fabrics, knits, leather skins, and the like can also be used. As the material for the skin material, a material having a melting point higher than the melting point of the core is preferable. In the case of a nonwoven fabric, polyester fibers and those formed by mixing low melting point fibers with this (unit area weight 100 g / m ² to) are used. Most suitable.
[0022]
The hollow base material 5 thus formed is cut slightly larger than the floor surface of the trunk room of the automobile to be laid, and then the terminal is processed in the following terminal processing step.
[0023]
First, as shown in FIG. 1 (a), set in favor of the hollow substrate 5 on the support die 10. In the present embodiment, as the support die 10, at least the upper part of the end portion of the hollow base material 5 is exposed. The end of the hollow substrate 5 does not necessarily have to protrude from the support mold 10. Around the support mold 10, a blade mold 11 is provided above the end of the supported hollow base material 5 and can be lowered onto the lower support mold 10 and can cut the liners 1 a and 1 b. in addition, the liner 1a of the hollow substrate 5, which is supported lifting, during 1b, the them parallel insertable, it is also provided a little thin heating plate 8 than the width between the liner 1a, 1b.
[0024]
Next, as shown in FIG. 1B, the heating plate 8 is inserted between the front and back liners 1 a and 1 b of the hollow base material 5 from the cut end surface. As a result, at least the standing wall forming member 5 in the vicinity of the edge of the hollow base material 5 is pushed into the hollow base material 5 while being softened and melted.
[0025]
At this time, it is suitable that the temperature of the heating plate 8 is higher than the melting point of the thermoplastic resin constituting the liners 1a and 1b and the standing wall forming member 2 and does not damage the skin material. For example, when a polypropylene resin is used as the thermoplastic resin, the temperature of the heating plate 8 is about 200 ° C. The insertion amount of the heating plate 8 is set to a length slightly shorter than the thickness of the hollow base material 5.
[0026]
With the heating plate 8 inserted in this manner, the heating plate 8 is held for a while. As a result, the standing wall forming member 2 is sufficiently melted and the inner surfaces of the front and back liners 1a and 1b are slightly melted. The thermoplastic resin constituting the liners 1a and 1b and the standing wall forming member 2 is polypropylene resin, and the heating plate 8 is held at about 200 ° C. for about 15 seconds. Then, after securing the molten state of the hollow substrate 5, as shown in FIG. 1 (c), retracting the heating plate 8 to the outside.
[0027]
Next, as shown in FIG. 1 (d), the blade mold 11 that has been waiting above the support mold 6 is lowered to bend the end of the liner 1 a on the surface side, and this is the edge of the hollow substrate 5. That is, the standing wall forming member 2 is sequentially welded to the melted portion from the top to the bottom. At this time, since the blade mold 11 is a cold plate (room temperature), the temperature of the melted inner surface of the liner 1a and the standing wall forming member 2 quickly decreases as the liner 1a contacts the blade mold 11. Solidifies and completes the welding promptly.
[0028]
Next, as shown in FIG. 1 (e), the blade mold 11 is further lowered, and the bent portion of the liner 1a on the surface side is welded to the lower end so as to completely cover the edge surface of the hollow base material 5. At the same time, the cutting blade attached to the tip of the blade mold 11 simultaneously cuts the excess bending portion of the liner 1a and the liner 1b on the back surface side at the same position. Thus, the terminal processing step is completed, and as a result, as shown in FIG. 1 (f), the hollow base material 5 whose edge is covered with the liner 1a is obtained.
[0029]
In the present embodiment, since the liner 1a covering the end face is not to be heat collapsing, no burr is generated in this portion. Since the liner 1a remains in its original thickness, an excessive load is not required for folding, and the liner 1a can be easily and satisfactorily folded. Even if burrs are generated in the standing wall forming member 2 that is softened and melted by heating, this portion is finally covered with the liner 1 a, and the burrs are confined in the hollow substrate 5. Further, since the surface of the liner 1a is not directly heated, it is not damaged by heat and does not deteriorate in appearance. From these things, according to this embodiment, it is possible to finish and finish the terminal of the hollow base material 5 without performing post-processing.
[0030]
Further, in this embodiment , the number of steps is reduced, and only the upper blade mold 11 is used to bend the liner 1a, so that there is an advantage that the processing apparatus can be simplified. Further, since the remaining portions of the liners 1a and 1b are cut, it is not necessary to increase the accuracy of rough cutting before terminal processing, and there is an advantage that the process speed can be easily increased.
[0031]
As a result of actually performing the end treatment of the hollow base material by the end treatment method of the present embodiment, even a concave and convex curved end having a radius of curvature of 5 mm can be satisfactorily processed. It was. The bent portion of the liner 1a has a moderately smooth shape, and the so-called R-sag, in which the corners are rounded more than necessary, does not occur. There was no phenomenon that the liner 1a or the skin material was peeled off from the cut end after cutting.
[0032]
In the present embodiment, a resin cardboard terminal can be suitably processed as the hollow base material 5, but the terminal processing method of the present invention is the same type of thermoplastic resin base material having a standing wall inside, for example, It can also be used for terminal treatment of blow molded substrates. Further, in the present embodiment, the bent portions of the liners 1a and 1b are fused to the standing wall forming member, but may not necessarily be fused. By fusing, the folded liners 1a and 1b can be firmly fixed, which is preferable.
[0033]
【The invention's effect】
As described above, according to the terminal treatment method for a hollow base material of the present invention, it is possible to perform the process of covering the edge surface of the cut terminal with the liner without excessively crushing the liner. No burrs are produced on the liner covering the terminal, and the appearance does not deteriorate due to heating. For this reason, even if it does not post-process, the terminal of a hollow base material can be finished finely.
[Brief description of the drawings]
[1] of the implementation form of the present invention, a diagram showing a terminal processing method of the hollow substrate, are shown in time series cross-sectional view at (a) ~ (f) are respective steps.
FIGS. 2A and 2B are diagrams showing a conventional method for treating the end of a resin corrugated cardboard, and FIGS. 2A to 2F show cross-sectional views in each step in time series.
FIGS. 3A and 3B are diagrams showing a terminal processing method for resin corrugated cardboard according to another conventional example, and FIGS. 3A to 3G show cross-sectional views at each step in time series.
FIGS. 4A and 4B are diagrams showing a method for processing a terminal of a resin corrugated cardboard according to still another conventional example, and FIGS. 4A to 4C show cross-sectional views in each step in time series.
FIGS. 5A and 5B are diagrams showing a method for treating the end of a resin corrugated cardboard according to still another conventional example, and FIGS. 5A to 5C show cross-sectional views in each step in time series.
[Explanation of symbols]
1a, 1b Liner 2 Standing wall forming member 5 Hollow base material
10 Supporting Type 8 Heating Plate 11 Blade Type 30, 40, 50 Resin Cardboard 31 Receiving Base 32, 41 Heat Bar 51 Table 52 Vertical Slide Member 53, 63 Hot Blade

Claims (2)

A core having front and back liners made of a thermoplastic resin and standing wall forming members made of a thermoplastic resin that form a plurality of standing walls between the liners, and a large number of hollow portions between the liners was formed. A method for treating a terminal of a hollow substrate,
A heating member is inserted between the front and back liners in a direction parallel to the front and back liners from the outside of the hollow base material, while at least the standing wall forming member near the edge of the hollow base material is softened and melted. Pushing into the inside of the hollow substrate;
Next, a terminal portion of one of the front and back liners, which is removed by pushing the standing wall forming member inward, is bent in a direction along the edge of the hollow base material so as to cover the edge, and the one liner And a step of cutting the front and back liners at the same position at a portion where the second end abuts against the other liner.   The end of the hollow base material according to claim 1, wherein in the step of folding one of the front and back liners, the bent portion of the one liner is fused to the softened and melted standing wall forming member. Processing method.

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