JP2000181389A - Thermoplastic resin foamed rod body containing wood powder and having light emitting diode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a body which can be used without complicated secondary processing. SOLUTION: This thermoplastic resin foamed rod body containing wood powder is molded by foaming and extruding a molding material consisting of a thermoplastic resin with wood flour compounded, and the body consists of a skin layer 2 not foamed in the outer side, a low-foamed core layer 4 in the inner side, and a foamed layer 3 between the two layers. At least one hole 5 penetrating from the outer surface to the hollow part 10 is formed in this body, and the hole is filled with a light-emitting diode 8 sealed in a thermosetting resin 6 with addition of a light-diffusing agent. The wiring cords 7 connected to the leads 9 of the light-emitting diode are led to the outside from the one face of the thermosetting resin 6 with addition of the light-diffusing agent which fills the hollow part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed rod made of thermoplastic resin containing wood powder and having a light emitting diode in which a light emitting diode that emits light in the dark is integrally provided.

[0002]

2. Description of the Related Art An example of a conventional light-emitting sign device used for displaying a position for identifying a danger zone in a construction site or the like will be described.

[0003] As shown in FIG. 8, in this conventional luminescent marker device, a synthetic resin 102 in which transparent hollow beads 101 are dispersed is packed in an aluminum pipe 103, and a hole formed in the synthetic resin 102 is formed. Shield piece 10 in 104
5 and the light emitting diode 106 are inserted, and one end of the pipe 103 is sealed with a sealing resin member 107 so that the exposed surface of the synthetic resin 102 on the other end of the pipe 103 emits light uniformly. (JP-A-5-280014).

[0004]

The above-mentioned conventional luminous sign device is used by assembling it with sign means or the like for installation outdoors, and is used for building materials such as handrails for stairs, columns for stands, hanger boards, etc. However, when used for displaying the position in the dark in an interior product or the like, there is a problem that it is necessary to perform complicated secondary processing for assembling the luminescent marking device to these members.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is made of a foam made of a thermoplastic resin containing wood powder having a light emitting diode, which can be used without complicated secondary processing. It is intended to realize a rod-shaped body.

[0006]

In order to achieve the above object, a foamed rod made of a thermoplastic resin containing wood powder having a light emitting diode according to the present invention is made of a foamed material formed by mixing wood powder with a thermoplastic resin. An extruded, unfoamed skin layer on the outer surface, a low-foamed core layer on the inner surface, and a wood-filled thermoplastic resin foam tube made of a foam layer between the skin layer and the core layer. The body is provided with at least one hole penetrating from the outer surface to the hollow portion, and in the hole, a light emitting diode sealed in a thermosetting resin containing a light diffusing agent is provided.

[0007] Further, foamed extrusion molding is performed from a molding material in which wood powder is blended with a thermoplastic resin, wherein an unfoamed skin layer on the outer surface side, a low foamed core layer on the inner surface, and the skin layer and the core A groove extending in the axial direction is provided on the outer surface of the thermoplastic resin foam cylindrical body containing wood powder, which is formed of a foam layer between the layers, and the groove is sealed in a thermosetting resin containing a light diffusing agent. A light emitting diode may be provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a foamed rod made of thermoplastic resin containing wood powder and having a light emitting diode according to the present invention will be described with reference to the drawings.

FIG. 1 shows a foamed rod made of a thermoplastic resin containing wood powder having a light emitting diode according to a first embodiment, wherein (a) is a schematic perspective view, and (b) is a schematic plan view of the light emitting diode. is there. In the present embodiment, a foamed rod made of thermoplastic resin containing wood powder having a light emitting diode is obtained by foaming and extruding a molding material in which wood powder is mixed with a thermoplastic resin, and has an unfoamed skin on the outer surface side. Thermoplastic foamed cylindrical body 1 containing wood flour, comprising a layer 2, a low-foamed core layer 4 on the inner surface side, and a foamed layer 3 between the skin layer 2 and the core layer 4.
In addition, at least one hole 5 penetrating from the outer surface to the hollow portion 10 is formed.
Each of the holes 5 is provided with three light emitting diodes 8 sealed in a thermosetting resin 6 containing a light diffusing agent. I have.

In this embodiment, the light emitting diode 8
The entirety including the light emitting portion 8a is housed in the hole 5 by inserting the light emitting portion 8a toward the outer surface side into the hole 5, and the outer surface of the light emitting portion 8a and between the light emitting diode 8 and the hole 5 are provided. Is filled with a thermosetting resin 6 containing a light diffusing agent.

The wiring cord 7 connected to the lead 9 of each light emitting diode 8 is drawn out from one end surface of the thermosetting resin 6 containing the light diffusing agent filled in the hollow portion 10.

As the thermoplastic resin, a thermoplastic resin having a melting temperature of 250 ° C. or less, such as an acrylic resin, polycarbonate, polystyrene, or polyurethane, is used. The reason is that in the case of a thermoplastic resin whose melting temperature is higher than 250 ° C.,
This is because, during plasticization, the wood powder mixed with the thermoplastic resin is deteriorated or carbonized due to thermal decomposition, and molding failure occurs.

As the wood flour, there can be used pulp and a material mainly composed of cellulose, in addition to crushed products such as wood chips, offcuts and wood chips, sander powder, sawdust and sawdust.

The mixing ratio of the wood powder to the thermoplastic resin is as follows:
When the content is within the range of 30 to 80% by weight, stable foam extrusion can be achieved. When the blending ratio of the wood powder to the thermoplastic resin is less than 30% by weight,
Foaming becomes difficult only by blending wood flour alone. vice versa,
When the mixing ratio of the wood powder to the thermoplastic resin is more than 80% by weight, it is difficult to form an unfoamed skin layer, and the outer surface becomes rough, sharkskin, and cracks. In addition, unless the extrusion speed is extremely low, foam extrusion cannot be performed, resulting in poor productivity.

In the foaming of the present invention, the compounded wood flour expands by heating, and a foam layer is formed by the expansion of the wood flour. For this reason, the present invention is also effective for a thermoplastic resin of a type in which gas by the foaming agent is dissipated in the conventional foaming with the foaming agent. That is, in the present invention, the thermoplastic resin used has a melting temperature of 250.
Any type can be used as long as the temperature is below ° C.

The foamed tubular body made of thermoplastic resin containing wood powder according to the present invention is not limited to the cylindrical one shown in FIG. 1, but may be formed into an elliptical tubular shape, a square tubular shape, a polygonal tubular shape or the like as necessary. Needless to say, it can be changed.

As the thermosetting resin containing a light diffusing agent, a transparent or translucent thermosetting resin such as an epoxy resin or silicone rubber in which transparent hollow beads made of glass as a light diffusing agent are dispersed is used. Used.

FIG. 2 shows a foamed rod made of thermoplastic resin containing wood powder and having a light emitting diode according to a second embodiment. The foamed rod made of thermoplastic resin containing wood powder having this light emitting diode is provided on the foamed tubular body 1 made of thermoplastic resin containing wood powder from the outside in place of the hole 5 in the first embodiment shown in FIG. At least one long hole 15 penetrating into the hollow portion 10 (in the drawing, two holes are provided at intervals) is provided, and the long hole 15 is sealed in the thermosetting resin 6 containing a light diffusing agent. At least one light emitting diode (not shown) is provided for each.

FIG. 3 shows a foamed rod made of thermoplastic resin containing wood powder and having a light emitting diode according to a third embodiment. The wood-filled thermoplastic resin foam rod having the light emitting diode is provided on the outer surface of the wood-flourted thermoplastic resin foam tubular body 1 instead of the hole 5 in the first embodiment shown in FIG. A groove 25 extending in the axial direction is provided, and at least one light emitting diode (not shown) enclosed in the thermosetting resin 6 containing a light diffusing agent is provided in the groove 25.
Further, a wiring cord 7 for supplying power to the light emitting diode is drawn out to the outside through the hollow portion 10.

In FIGS. 2 and 3, the same parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

Next, an embodiment of a method for manufacturing a foamed rod made of thermoplastic resin containing wood powder and having a light emitting diode according to the present invention will be described with reference to FIGS.

(1) As shown in FIGS. 4 and 5, a heating cylinder 52 of a screw-type extruder 51 is heated to a predetermined temperature, and wood powder is mixed with a thermoplastic resin via a hopper 58. After the material is supplied and kneaded and melted, it is extruded as a cylindrical body 59 from an annular extrusion port 54a of a die 54 attached to the head 53.

The molding material is processed into granules or pellets by hot mixing an inorganic additive such as talc, titanium oxide, calcium carbonate or the like in an amount necessary for improving the extrudability. Good.

(2) The outer surface of the cylindrical body 59 is cooled and solidified by passing the cylindrical body 59 extruded by the above (1) through the first sizing die 55 cooled to a predetermined temperature by the cooling means 55a. To form an unfoamed skin layer 2 and foam toward the axial center of the hollow cylindrical portion 59a.

(3) After the above (2), the cylindrical body 59 having the foaming layer 59b being foamed inside the skin layer 2 is placed in the second layer.
By passing through the sizing die 56, the foam is further foamed toward the axial center of the cylindrical hollow portion 59 a with the outer surface regulated, and then cooled and solidified in the cooling tank 57 to form a low foaming core layer on the inner surface side. By forming 4, the foamed tubular body 1 made of thermoplastic resin containing wood powder is obtained.

In this step, the core layer 4 is formed on the inner surface side, and the core layer 4 is reduced in a well-balanced manner as the foaming proceeds toward the axial center, so that the distribution of the foaming pressure is made uniform. For this reason, the foamed layer 3 with little change in the foaming ratio is formed.

The above-mentioned foaming is carried out by gasification of volatile components such as moisture and lignin components contained in the wood powder mixed with the thermoplastic resin, and the wood powder expands. The expansion due to the foaming is directed toward the axial center of the cylindrical hollow portion 59a of the cylindrical body 59 in which the unfoamed skin layer 2 is formed on the outer surface, so that the thickness of the cylindrical body 59 extruded from the die 54 is increased. The expansion ratio can be controlled to a predetermined value by adjusting the cooling temperature or the like.

When a skin layer having a wood grain pattern is formed, it is preferable to use a blend of 0.01 to 30 parts by weight of a pigment master batch with respect to 100 parts by weight of the above-mentioned molding material. In this way, the skin layer provided with a grain pattern can be used as a member of an indoor building material or interior product in a state in which the wood-filled thermoplastic resin foam rod having a light emitting diode is provided as it is. .

(4) After the above (3), as shown in FIG. 6, the thermoplastic resin foamed tubular body 1 containing wood powder is cut into a predetermined length, and then, as shown in FIG. At least one hole 5 penetrating from the outer surface of the layer 2 to the hollow portion 10 (three holes are formed at intervals in the illustrated one).
Form.

(5) After the above (4), a light emitting diode 8 (see FIG. 1) is inserted into each hole 5 so that the light emitting portion 8a faces the outer surface side, and then the outer surface of the light emitting portion 8a and the light emitting diode By injecting a liquid light-diffusing agent-containing thermosetting resin into the gap between the hole 8 and the hole 5 and the hollow portion 10 and then curing the resin, a wood powder-containing thermoplastic resin foam rod having a light emitting diode is formed. obtain.

[0031]

Since the present invention is configured as described above, the following effects can be obtained.

Since the light emitting diode is integrally provided on the foamed tubular body made of thermoplastic resin containing wood powder, it is not necessary to perform complicated secondary processing as in the above-described conventional example, and the wiring cord is inserted into the hollow portion. Wiring code can be hidden.

Further, since the light emitting diode consumes a small amount of power and generates almost no heat, not only is there no danger of discoloration or deformation due to heat, but also cordless operation using a dry battery or the like as a power source becomes possible.

Further, since the light emitting diode is sealed in the thermosetting resin containing the light diffusing agent, the light of the light emitting diode is scattered and the light emitting surface emits light uniformly, and the durability is remarkably improved.

In addition, since various light-emitting colors can be obtained by combining light-emitting diodes having different wavelengths, light can be emitted in an appropriate color according to the application.

[Brief description of the drawings]

FIGS. 1A and 1B are schematic perspective views and FIG. 1B is a schematic perspective view of a foamed rod made of a thermoplastic resin containing wood powder and having a light emitting diode according to a first embodiment.

FIG. 2 is a schematic perspective view of a foamed rod made of thermoplastic resin containing wood powder and having a light emitting diode according to a second embodiment.

FIG. 3 is a schematic perspective view of a foamed rod made of thermoplastic resin containing wood powder and having a light emitting diode according to a third embodiment.

FIG. 4 is an explanatory view showing one example of a method for producing a thermoplastic resin foamed tubular body containing wood powder.

FIG. 5 is a schematic partial sectional view taken along line AA of FIG. 4;

FIG. 6 is a schematic perspective view showing an example of a thermoplastic resin foamed cylindrical body containing wood powder.

FIG. 7 is a schematic perspective view showing a state in which holes are provided in the foamed tubular body made of thermoplastic resin containing wood powder shown in FIG. 6;

FIG. 8 is a schematic cross-sectional view showing an example of a conventional luminescent marker device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermoplastic resin foam body containing wood powder 2 Skin layer 3 Foam layer 4 Core layer 5 Hole 6 Thermosetting resin containing light diffusing agent 7 Wiring code 8 Light emitting diode 8a Light emitting part 9 Lead 10 Hollow part 51 Screw type extrusion Machine 52 Heating cylinder 53 Head 54 Die 54a Extrusion port 55 First sizing die 55a Cooling means 56 Second sizing die 57 Cooling tank 58 Hopper 59 Cylindrical body 59a Cylindrical hollow part 59b Foaming layer during foaming

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hironobu Uyama 6-3-12 Higashiyama Honshinmachi, Yao-shi, Osaka (72) Inventor Yasuhiro Yasumoto 2-1-12 Kupoji Temple, Yao-shi, Osaka F-term (reference) 4F207 AA01 AA13 AA21 AA28 AA31 AG03 AG07 AG14 AG20 AG28 AH43 KA01 KA11 KA14 KW26 5C096 AA27 BA04 CA06 CA17 CA29 CA32 CB04 CC06 CC28 CF09 EA08 FA03

Claims (4)

[Claims] 1. A foamed extrusion molded from a molding material in which wood powder is blended with a thermoplastic resin, wherein an unfoamed skin layer on an outer surface, a low foamed core layer on an inner surface, and the skin layer and the core At least one hole penetrating from the outer surface to the hollow portion is provided in the thermoplastic resin foamed cylindrical body containing wood flour, which comprises a foamed layer between the layers, and the light diffusing agent-containing thermosetting resin is provided in the hole. A wood-filled thermoplastic resin foam rod having a light-emitting diode, wherein the light-emitting diode enclosed in the package is provided. 2. A foamed extrusion molded from a molding material in which wood powder is blended with a thermoplastic resin, wherein an unfoamed skin layer on an outer surface, a low foamed core layer on an inner surface, and the skin layer and the core On the outer surface of the foamed tubular body made of thermoplastic resin containing wood powder formed of a foam layer between layers, a groove extending in the axial direction is provided,
A foamed rod made of a thermoplastic resin containing wood powder, having a light emitting diode, wherein a light emitting diode sealed in a thermosetting resin containing a light diffusing agent is provided in the groove. 3. The luminescent material according to claim 1, wherein the molding material is a mixture of a thermoplastic resin having a melting temperature of 250 ° C. or less and wood flour within a range of 30 to 80% by weight. A foamed rod made of thermoplastic resin containing wood powder and having a diode. 4. The foamed rod made of thermoplastic resin containing wood flour and having a light emitting diode according to claim 1, wherein the skin layer has a wood grain pattern.