JPH06293037A - Manufacture of molding base - Google Patents

Abstract

PURPOSE:To provide the strength, appearance and quality which are equivalent to those of moldings which have been formed by a direct molding method of only a wood fiber group by hot press molding of a mixed fiber group of a fine reclaimed fiber group from which pieces of foreign matters have been removed and screened, and the wood fiber group which is fibrillated and made fiber. CONSTITUTION:A reclaimed fiber group 3 which is treated by a rag opener and reproduced is prepared, and classified in a classification device 14 by differences of specific gravities and pieces of foreign matters 4 which have larger specific gravities are removed, and fine fibrillated reclaimed fiber group 5 is taken out, and delivered from the inside of a tank 15 to a conveyer 17. On the other hand, a wood chips group 6 is fibrillated and the fiber and an aqueous binder is added to prepared a wood fiber group 7 which is delivered from a tank 16 to the conveyer 17, and the group 5 and the group 7 are piled up and conveyed the conveyer 17. Further, a laminated body of the fiber groups 5 and 7 is sent to a mixing machine 18 and mixed while being dispersed, and the mixed fiber group 8 is divided into quantities required to make one molding matrix K, and each group is delivered to a hot press molding machine 19 for hot press molding, then, a molding base K is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a molding base material for a door trim by reusing a molding end material generated at the time of molding a molded product which is a core material of a door trim for an automobile.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a recycled molding substrate of this kind, as shown in FIG. 3, for example, hemp fibers and wood pulp are molded as main materials and constituent fibers are joined by a binder or the like. A group of cut pieces 5 by cutting a molding end material 52 generated when molding a molded product 51 from a molding material 50 by a dry mat molding method (DMM) or the like.
3 is produced, and the fluff fiber group 54 fluffed by fluffing the cut piece group 53 by the fluffing machine and the wood fiber group 56 in which the wood chips 55 are steamed and defibrated to be fiberized in another step And the mixing ratio of the fluff fiber group 54 is 40 to 50.
% To form a raw material fiber group 57, and the raw material fiber group 57 was thermocompressed at a temperature of about 200 ° C. by a thermocompression molding machine to produce a molding substrate 58.

[0003]

In the method of manufacturing the molding substrate 58 described above, hemp fibers having a fiber length of about 60 to 80 mm are entangled with the defibration roller or the like of the defibrating machine when the cut piece group 53 is fluffed. The spinning of the bristle fiber group 54 becomes impossible, or the mixed state of the hemp fiber and the wood fiber group 56, which have a long fiber length and tend to be entangled, becomes non-uniform, resulting in unevenness on the surface of the molding substrate 58. The molding base is caused by a problem that the quality and appearance of the molding base 58 is deteriorated, an undisentangled small fiber soul mixed in the fluff fiber group 54, or a foreign matter piece 59 such as a heat-sealed cured piece. There is a problem that a local convex portion is generated on the surface of the material 58. The present invention aims to solve the above problems.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a group of cut pieces obtained by cutting a molding end material generated at the time of molding of a molded article formed by using hemp fiber and wood pulp as main materials is rough fluff and fine fluff. Then, the fluffed fluff fiber group is classified by the specific gravity difference, and the fine fluff fiber group and the wood chip group that have been selected by removing foreign matter pieces from the fluff fiber group are defibrated. A fiber mixture, a wood fiber group to which a binder is added, is mixed at a low mixing ratio of the fine fiber fibers, and the fiber group is a mixture of the fine fiber fibers and the wood fiber group. Is subjected to thermocompression molding to produce a molded substrate.

[0005]

[Function] To repel a cut piece group obtained by cutting a molding end material generated at the time of molding of a molded article formed mainly of hemp fiber and wood pulp in two steps of a rough fluffing step and a fine fluffing step The fiber length of the hemp fibers in the fluff fiber group is shortened by removing the foreign matters from the fluff fiber group by classifying the fluff fiber group by the specific gravity difference, and the fine fibers selected from the fluff fiber group are selected. Stabilizing the quality of the mixed fiber group that is the raw material of the molding base material by mixing the fluff fiber with the wood fiber group at a low ratio.

[0006]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the fluff ratio of the fluff fiber group obtained by fluffing the cut piece group in two steps is improved, and the fiber of the hemp fiber in the fluff fiber group is improved. The length can be shortened, the entanglement of the hemp fibers can be eliminated, the mixed state of the fine fluff fiber group and the wood fiber group can be balanced, and the quality of the molding substrate can be stabilized, and the fluff fiber group can be stabilized. To remove foreign particles that are mixed in the fluff fiber group, and to mix only the fine fluff fiber group that has been sufficiently fluffed and defibrated with the wood fiber group at a low ratio. The surface morphology can be balanced to improve the quality of the molding substrate, and the strength is similar to that of the molded product formed by the direct molding method using only the wood fiber group,
A molded substrate having an appearance and quality can be manufactured.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. When manufacturing a molding substrate K applied as a core material of an automobile door trim, first, a molded product S manufactured by a dry papermaking method using hemp fibers and wood pulp as main materials, and a group of constituent fibers joined by a binder or the like. Molded end material 1 generated when molding is 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 roughly fluffed by the coarse fluffing machine 12, and then the fine fluffing machine 13 causes the hemp fibers in the cut pieces to have a fiber length of about 20 to 40 mm. The napped fiber group 3 is regenerated by two steps to be regenerated and regenerated in two steps.

Subsequently, the fluff fiber group 3 is introduced into the classifier 14 through a duct and classified by the difference in specific gravity in the classifier 14, and from the fluff fiber group 3, undisentangled small fiber lumps and heat are collected. The foreign matter pieces 4 having a large specific gravity such as the fused pieces that have been fused are removed, and the sufficiently defibrated fine fluff fiber group 5 is selected and taken out, and the selected fine fluff fiber group 5 is first collected by a duct. The first accumulation tank 15 which is sent into the tank 15
The sheet is sent out from the inside onto the conveyor 17.

On the other hand, the wood chip group 6 is steamed and defibrated, and a wood fiber group 7 which is made into a fiber and added with an aqueous binder is produced in a separate step.

Next, the wood fiber group 7 which has been made into fibers and to which the binder has been added is provided with a duct to the second accumulation tank 16
It is sent to the inside and conveyed from the inside of the second accumulation tank 16 to the conveyor 17
It is sent out in the form of a sheet, and the group of fine fiber fibers 5 and the group of wood fibers 7 are superposed and conveyed by a conveyor 17. At this time, the fine fluff fiber group 5 and the wood fiber group 7 have a mixing ratio of 1 of the whole fine fluff fiber group 5.
Overlap so that the ratio becomes 0% to 20%, which is a low ratio.

Subsequently, a conveyor 17 is provided with a laminated body in which the fine fluff fiber group 5 and the wood fiber group 7 are vertically stacked.
It is sent to the mixer 18 by and mixed with the fine wool fiber group 5 and the wood fiber group 7 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 substrate K. The mat-shaped mixed fiber group 8 divided into various amounts is sent to the thermocompression molding machine 19 one by one to be thermocompression molding machine 1.
By hot pressing at a temperature of about 200 ° C. according to No. 9, a molding substrate K can be produced.

Next, the operation and effect of the embodiment having the above-mentioned structure will be described. In this example, the cut piece group 2 obtained by cutting the molded end material 1 generated at the time of molding of the molded product S molded by using the hemp fiber and the wood pulp as the main materials is roughly fluffed and finely fluffed, and then fluffed. The debris fiber group 3 is classified according to the difference in specific gravity, the foreign debris 4 is removed from the debris fiber group 3, and the fine debris fiber group 5 and the wood chip group 6 that have been selected are disentangled to form fibers. Mixed with the binder-added wood fiber group 7 at a low mixing ratio of the fine fiber fibers group 5, and a mixed fiber group 8 in which the fine fiber fibers group 5 and the wood fiber group 7 are mixed. Is subjected to thermocompression molding to produce a molding substrate K.

For this reason, the fluff ratio of the fluff fiber group 3 obtained by fluffing the cut piece group 2 in two steps is improved, and the fluff fiber group 3 is improved.
The fiber length of the hemp fibers in the inside can be shortened, the entanglement of the hemp fibers can be eliminated, the mixed state of the fine wool fibers 5 and the wood fibers 7 can be balanced, and the quality of the molding substrate K can be stabilized. At the same time, the fluff fiber group 3 is classified to remove the foreign matter pieces 4 mixed in the fluff fiber group 3, and only the fine fluff fiber group 5 that has been sufficiently fluffed and disentangled has a low ratio. Since it is mixed with the wood fiber group 7, the surface morphology of the molding base material K can be balanced and the quality of the molding base material K can be improved, and it is the same as the molded product molded by the direct molding method using only the wood fiber group 7. It is possible to manufacture a molding substrate K having a level of strength, appearance and quality.

Further, since the mixing ratio of the fine fluff fiber group 5 is set to a low ratio, increasing the amount of the binder added to the wood fiber group 7 can reduce the equipment for adding the fluff fiber binder.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a flow chart for explaining a manufacturing process of a molded base material.

FIG. 2 is likewise a flow chart of the manufacturing process of the molded substrate.

FIG. 3 is a flow diagram illustrating a manufacturing process of a conventional molded substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded end material 2 Cut piece group 3 Anti-fluff fiber group 4 Foreign material piece 5 Fine fluff fiber group 6 Wood chip group 7 Wood fiber group 8 Mixed fiber group K Molding base material S Molded product

Claims (1)

[Claims] 1. A group of cut pieces obtained by cutting a molding end material generated at the time of molding of a molded article formed by using hemp fibers and wood pulp as main materials are coarsely fluffed and finely fluffed, and then fluffed. The fluff fiber group is classified by the specific gravity difference, and the fine fluff fiber group selected by removing foreign matter pieces from the fluff fiber group and the wood chip group are defibrated to be fiberized, and the binder is added. And a wood fiber group are mixed at a low mixing ratio of the fine fluff fiber group, and the mixed fiber group in which the fine fluff fiber group and the wood fiber group are mixed is formed by thermocompression molding. A method for producing a molded substrate, which comprises producing a material.