JP3303414B2 - Manufacturing method of molded base material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a molding base material for door trim by reusing molded scraps generated during molding of a molded product serving as a core material of a door trim for automobiles.

[0002]

2. Description of the Related Art Conventionally, in producing such a regenerated molded base material, as shown in FIG. 3, for example, hemp fiber and wood pulp are formed as main materials and constituent fibers are joined by a binder or the like. A cutting piece 52 generated when the molded product 51 is molded from the molding material 50 by a dry mat molding method (DMM) or the like is cut and a cut piece group 5 is formed.
3 is produced, and the cut piece group 53 is plied by an anti-hair machine to be plied. The wood fiber group 56 is made by steaming and defibrating the wood chips 55 and fibrillating them. And the mixing ratio of the anti-hair fiber group 54 is 40 to 50.
% To obtain a raw material fiber group 57, and the raw material fiber group 57 is hot-pressed at a temperature of about 200 ° C. by a hot-pressing machine to produce a forming base material 58.

[0003]

In the method of manufacturing the molding base material 58 described above, the hemp fibers having a fiber length of about 60 to 80 mm are entangled with a defibrating roller or the like of the anti-hairing machine when the cutting pieces 53 are turned up. The spinning of the bristle fiber group 54 becomes impossible, or the mixed state of the hemp fiber having a long fiber length and the entangled hemp fiber and the wood fiber group 56 becomes non-uniform, and irregularities occur on the surface of the molding base material 58, Due to problems such as deterioration of the quality and appearance of the molding base material 58, unfibrillated small fiber souls mixed in the anti-hair fiber group 54, and foreign matter pieces 59 such as heat-fused cured pieces, There are problems such as the occurrence of local projections on the surface of the material 58. An object of the present invention is to solve the above problems.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for forming a group of cut pieces obtained by cutting a molded piece generated at the time of molding a molded article formed mainly of hemp fiber and wood pulp into coarse and fine pliers. After that, the anti-haired fiber group is classified based on the specific gravity difference, and the fine hair fiber group and the wood chip group which are selected by removing the foreign material pieces from the anti-hair fiber group are defibrated. A mixed fiber group in which the fiberized wood fiber group to which the binder is added is mixed at a low mixing ratio of the fine hair fiber group, and the fine hair fiber group and the wood fiber group are mixed. Is hot-pressed to produce a molded substrate.

[0005]

[Function] A group of cut pieces obtained by cutting a molded piece generated at the time of molding of a molded article formed mainly of hemp fiber and wood pulp are bristled in two steps of a coarse bristle process and a fine bristle process. The fiber length of the hemp fibers in the group of anti-hair fibers is shortened by the method described above. The quality of the mixed fiber group which is the raw material of the forming base material is stabilized by mixing the anti-hair fiber with the wood fiber group at a low ratio.

[0006]

As described above, the present invention is constructed as described above, so that the ratio of the bristle fibers in the group of anti-hair fibers, in which the group of cut pieces is anti-hair in two steps, is improved, The length can be shortened, the entanglement of the hemp fibers can be eliminated, the mixed state of the fine fiber hair group and the wood fiber group can be leveled, and the quality of the molding base material can be stabilized. To remove foreign particles mixed in the anti-hair fiber group, and to mix only the finely-haired fiber group, which has been sufficiently dehaired and defibrated, with the wood fiber group at a low ratio. The surface morphology can be leveled and the quality of the molding base can be improved, and the same strength as a molded product molded by the direct molding method using only the wood fiber group,
A molded substrate having appearance and quality can be manufactured.

[0007]

Next, an embodiment of the present invention will be described with reference to FIGS. In manufacturing the molding base material K used as the core material of the door trim for automobiles, first, a molded product S manufactured by a dry paper-making method using hemp fiber and wood pulp as a main material, and a constituent fiber group joined by a binder or the like. The shavings 1 generated at the time of shaping are cut by a cutting machine 11 to produce a cut piece group 2 having a length of about 200 mm.

Next, the cut piece group 2 is coarsely bristled by the rough bristles 12 and then the fine bristles 13 reduce the length of the hemp fibers in the cut pieces to about 20 to 40 mm. Then, an anti-hair fiber group 3 which is regenerated and regenerated in two steps is produced.

Subsequently, the group of anti-hair fibers 3 is put into a classifier 14 through a duct, and classified by a specific gravity difference in the classifier 14, and unfibrillated small fiber masses and heat The foreign material pieces 4 having a large specific gravity, such as fused hardened pieces, are removed, and the fibrillated fiber group 5 that has been sufficiently defibrated is selected and taken out. The first accumulation tank 15 is fed into the tank 15
The sheet is sent out onto the conveyor 17 from the inside.

On the other hand, the wood chip group 6 is steamed and defibrated to produce a fiberized wood fiber group 7 to which an aqueous binder is added in a separate step.

Next, the fiber group of wood fibers 7 to which the binder is added is ducted by the duct into the second accumulation tank 16.
Into the conveyor 17 from the second accumulation tank 16.
It is sent out in the form of a sheet, and the group of fine hair fibers 5 and the group of wood fibers 7 are superposed and conveyed by a conveyor 17. At this time, the mixing ratio of the group of fine fiber fibers 5 and the group of wood fibers 7 is set to 1
The layers are overlapped so that the ratio becomes 0% to 20% and the ratio becomes low.

Subsequently, a laminated body in which the group of fine hair fibers 5 and the group of wood fibers 7 are vertically stacked is placed on a conveyor 17.
The fiber group 5 and the wood fiber group 7 are sent to the mixer 18 and mixed while being dispersed by the mixer 18.

Subsequently, a mixed fiber group 8 in which the fine fiber group 5 and the wood fiber group 7 are mixed at a mixing ratio of 10 to 20% / 80 to 90% is necessary for producing one molding base K. Each of the mat-shaped mixed fiber groups 8 divided into a plurality of pieces and fed into the thermo-compression molding machine 19 one by one,
By hot-pressing at a temperature of about 200 ° C. according to No. 9, a molding base K can be produced.

Next, the operation and effect of the embodiment having the above configuration will be described. In the present example, a group of cut pieces 2 formed by cutting a molded piece 1 generated at the time of molding of a molded article S formed by using hemp fiber and wood pulp as main materials is rough and fine, and then is subjected to anti-hair. The anti-hair fiber group 3 is classified according to the specific gravity difference, and the fine hair fiber group 5 and the wood chip group 6 selected by removing the foreign material pieces 4 from the anti-hair fiber group 3 are defibrated to form fibers. The fiber group 7 to which the binder is added is mixed with the fiber group 7 with a low mixing ratio of the fiber group 5 and the mixed fiber group 8 in which the fiber group 5 and the wood fiber group 7 are mixed. Is hot-pressed to produce a molding base K.

[0015] For this reason, the anti-hair fiber group 3 in which the cut piece group 2 is anti-haired in two steps has an improved hair bristle ratio and the anti-hair fiber group 3
The fiber length of the hemp fiber in the fiber can be shortened, the entanglement of the hemp fiber is eliminated, the mixed state of the group of fine pliant fibers 5 and the group of wood fibers 7 is leveled, and the quality of the molding base material K is stabilized. In addition, the anti-hair fiber group 3 is classified and the foreign material pieces 4 mixed in the anti-hair fiber group 3 are removed. Mixed with the wood fiber group 7, the surface morphology of the formed base material K can be leveled and the quality of the formed base material K can be improved. It is possible to manufacture a molded base material K having a certain level of strength, appearance and quality.

Further, since the mixing ratio of the fine fiber fibers 5 is set to a low ratio, if the amount of the binder added to the wood fiber group 7 is increased, the equipment for adding the binder for the fine fibers can be reduced.

[Brief description of the drawings]

FIG. 1 is a flow chart showing one embodiment of the present invention and explaining a manufacturing process of a molded base material.

FIG. 2 is a flow chart of a manufacturing process of a molding base material.

FIG. 3 is a flowchart illustrating a conventional process of manufacturing a molded base material.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 molded piece 2 cut piece group 3 anti-hair fiber group 4 foreign material piece 5 fine brilliant fiber group 6 wood chip group 7 wood fiber group 8 mixed fiber group K molding base material S molding

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 43/02-43/34 B27N 3/04-3/12 D04H 1/42

Claims (1)

(57) [Claims] 1. A group of cut pieces obtained by cutting a molded piece generated at the time of molding of a molded article molded mainly of hemp fiber and wood pulp, after rough and fine hairs are formed, and then the hairs are re-haired. The anti-hair fiber group is classified based on the specific gravity difference, and the fine hair fiber group selected by removing foreign matter pieces from the anti-hair fiber group and the wood chip group are defibrated and fiberized, and a binder is added. The mixed wood fiber group is mixed with the fine fiber hair group at a low mixing ratio, and the mixed fiber group obtained by mixing the fine fiber fiber group and the wood fiber group is formed by hot-press molding. A method for producing a molded substrate, comprising producing a material.