JP5606156B2 - Bamboo fiber-containing resin molded body, method for manufacturing bamboo fiber-containing resin molded body, and manufacturing apparatus - Google Patents

Description

  The present invention relates to a bamboo fiber-containing resin molded body, a method for manufacturing a bamboo fiber-containing resin molded body, and a manufacturing apparatus.

  In recent years, it has been proposed to use bamboo, which is a natural resource that can be obtained relatively easily and grows quickly, as an industrial material (see Patent Document 1). Bamboo can be broadly divided into vascular sheaths with relatively high strength and relatively soft parenchyma cells. It has also been proposed to increase the rigidity of the molded body by separating parenchymal cells from the bamboo and producing a molded body using only vascular sheath fibers, that is, bamboo fibers (see Patent Document 2).

JP-A-6-207362 JP2007-283661

  In order to increase the rigidity of the molded body, separating parenchyma cells from bamboo can be an effective means. However, since parenchymal cells are removed from the bamboo, there is a problem that the proportion of bamboo fibers that can be used for the product in the bamboo, that is, the material yield is relatively low.

  Therefore, an object of the present invention is to provide a bamboo fiber-containing resin molded body that secures rigidity as a molded body while using bamboo material without waste using soft cells, and further, such bamboo fiber-containing resin. It aims at providing the manufacturing method and manufacturing apparatus of a molded object.

The bamboo fiber-containing resin molded body of the present invention is a bamboo fiber-containing resin molded body using bamboo fibers obtained by fiberizing bamboo material and parenchyma cells , wherein the bamboo fibers, the parenchyma cells and the thermoplastic resin fibers. It is characterized in that the ratio of the parenchyma cells contained in each layer is different .

Further, the bamboo fiber-containing resin molded body of the present invention is a bamboo fiber-containing resin molded body using bamboo fibers and soft cells obtained by fiberizing bamboo material, and an intermediate layer is sandwiched between a pair of surface layers. It has a laminated structure. The surface layer includes the bamboo fibers and thermoplastic resin fibers, and the intermediate layer includes the soft cells and thermoplastic resin fibers, and the intermediate layer having relatively low rigidity is replaced with the surface layer having relatively high rigidity. It has a feature in that it has a structure sandwiched between.

  Moreover, the method for producing a bamboo fiber-containing resin molded body of the present invention includes a step of obtaining bamboo fibers and soft cells by fiberizing bamboo material, and a first layer containing the bamboo fibers and thermoplastic resin fibers. And a second layer containing the parenchyma, and forming a laminated structure formed by laminating the first layer, the second layer, and the first layer in this order; And a step of integrally pressing the laminated structure to obtain a board body. And in the process of forming the said laminated structure, the said 2nd layer is formed by laminating | stacking the said parenchyma on the said 1st layer, moistening with a liquid.

  Furthermore, the apparatus for producing a bamboo fiber-containing resin molded body of the present invention includes a fiberizing part that obtains bamboo fibers and soft cells by fiberizing bamboo material, and a first fiber containing the bamboo fibers and thermoplastic resin fibers. A layer having a layer and a second layer containing the parenchyma, and forming a stacked structure formed by stacking the first layer, the second layer, and the first layer in this order And a pressing unit that integrally presses the laminated structure to obtain a board body. Furthermore, the stacking unit includes a spraying unit that sprays a liquid that wets the parenchyma cells stacked on the first layer. The second layer is formed by laminating the soft cells on the first layer while moistening the parenchyma with the liquid ejected from the ejection unit.

  According to the bamboo fiber-containing resin molded body of the present invention, since it consists of a two-layer laminate having at least different proportions of parenchymal cells, the bamboo material can be used without waste using parenchymal cells, and the molded body The rigidity as a whole can be ensured. By using parenchyma, it is possible to achieve a reduction in the weight of the molded body.

  According to the bamboo fiber-containing resin molded body of the present invention, since the intermediate layer having a relatively low rigidity is sandwiched between the surface layers having a relatively high rigidity, the bamboo material can be used without waste by using soft cells. And the rigidity of the molded body as a whole can be ensured. By using parenchyma cells as the material for the intermediate layer, it is also possible to reduce the weight of the molded body.

  Moreover, according to the manufacturing method and manufacturing apparatus of the bamboo fiber-containing resin molded body of the present invention, the second layer is formed by laminating the soft cells on the first layer while moistening with water. The parenchymal cells can be uniformly laminated on the first layer without scattering, and the parenchymal cells can be handled easily. Accordingly, it is possible to produce a bamboo fiber-containing resin molded body that uses bamboo material without waste, ensures the rigidity of the entire molded body, and achieves weight reduction.

It is a schematic block diagram which shows the whole manufacturing apparatus of a bamboo fiber containing resin molding. It is a figure which shows the fibrillator arrange | positioned at a fiberization part. It is sectional drawing which shows a bamboo fiber containing resin molding.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.

  With reference to FIG. 1, the manufacturing apparatus 100 of the bamboo fiber containing resin molding 10 which concerns on embodiment is the fiberization part 110 which obtains the bamboo fiber 21 and the parenchyma 22 by making the bamboo material 20 into a fiber, if it is outlined. A laminated part 120 for forming the laminated structure 30; a press part 130 for integrally pressing the laminated structure 30 to obtain the board body 40; and a molding part 140 for imparting a product shape to the board body 40. doing. The laminated structure 30 includes a first layer 31 containing bamboo fibers 21 and thermoplastic resin fibers 33, and a second layer 32 containing parenchyma cells 22. Two layers 32 and a first layer 31 are stacked in this order. The stacking unit 120 further includes a spray unit 150 that sprays water 151 (corresponding to a liquid) that wets the soft cells 22 stacked on the first layer 31, and the second layer 32 is replaced with the first layer. It is formed by laminating soft cells 22 on 31 while being wetted by water 151 sprayed from spray section 150. In the embodiment, the second layer 32 further contains bamboo fibers 21 having an average fiber length shorter than the average fiber length of the bamboo fibers 21 included in the first layer 31. For this reason, the stacking unit 120 stacks the second layer 32 on the first layer 31 while moistening the parenchyma cells 22 and bamboo fibers 21 having a short average fiber length with water 151 sprayed from the spraying unit 150. It is formed by doing.

  For convenience of explanation, the bamboo fiber 21 having a relatively long average fiber length is referred to as “bamboo long fiber 21L”, and the bamboo fiber 21 having a relatively short average fiber length is referred to as “bamboo short fiber 21S”. In addition, when the bamboo long fibers 21L and the bamboo short fibers 21S are included without being distinguished from each other, they are simply referred to as “bamboo fibers 21”. Details will be described below.

  The bamboo fiber-containing resin molded body 10 can be applied to, for example, a rear package tray which is one of automobile interior members.

  Referring also to FIG. 2, the fiberizing unit 110 is provided with a defibrator 111 for fiberizing the bamboo material 20. The defibrator 111 includes a conveyor 112 that supplies the bamboo material 20, a feed roll 113, a pin roll 114 provided with a large number of teeth, and a dust collector 115. Bamboo material 20 that has been softened through cutting, delignification treatment, and pressing is sent to the right in the figure by conveyor 112 and feed roll 113. The pin roll 114 rotates faster than the feed roll 113 and is defibrated by scratching the bamboo material 20 with many teeth softened. When the bamboo material 20 is defibrated, bamboo fibers 21 and parenchyma cells 22 are obtained. The obtained bamboo fibers 21 are bamboo long fibers 21L (for example, an average fiber length of 50 mm or more) and bamboo short fibers 21S (for example, an average). The fiber length is less than 50 mm). The soft cells 22 are cotton-like or powdery, and the bamboo short fibers 21S are cotton-like. The parenchyma cell 22 and the bamboo short fiber 21S have a lower specific gravity than the bamboo long fiber 21L. For this reason, most of the soft cells 22 and the short bamboo fibers 21 </ b> S can be collected by the dust collector 115. The bamboo long fibers 21L are blown along with the hooking action of the pin roll 114. Thus, the parenchyma cell 22 and the bamboo short fiber 21S can be sorted into the first container 116 and the bamboo long fiber 21L can be collected in the second container 117 according to the difference in specific gravity. The ratio of the soft cells 22 and the bamboo short fibers 21S is about 10 to 20% per unit weight after defibration.

  By changing the number of rotations of the pin roll 114, the size of the teeth, and the installation density, the ratio of the bamboo short fibers 21S and the bamboo long fibers 21L, the diameter of the bamboo fibers 21, the average fiber length, and the like can be changed. Bamboo fiber 21 can be obtained. For example, when the rotational speed of the pin roll 114 is sufficiently high with respect to the feed roll 113, a part of the softened bamboo material 20 pressed by the feed roll 113 is defibrated so that the pin roll 114 is torn off. Thereby, the ratio of the bamboo short fibers 21S can be relatively increased.

  In the laminated structure 30 formed in the laminated portion 120, the second layer 32 containing the soft cells 22 contains the bamboo fibers 21 and the thermoplastic resin fibers 33, and is sandwiched between the first layers 31 that are nonwoven fabric-like. .

  Here, it is preferable that the parenchyma cell 22 is not contained in the first layer 31. This is because the cotton-like or powder-like parenchyma cells 22 are likely to fall off when forming a nonwoven fabric together with the thermoplastic resin fibers 33. Moreover, it is for preventing that the rigidity of the 1st layer 31 falls by the parenchyma 22 being mixed. However, in the defibrator 111 of the embodiment, the bamboo length fibers 21L and the bamboo short fibers 21S and the parenchyma cells 22 are separated using the difference in specific gravity. It may be mixed into the first layer 31 by being entangled with 21L. Thus, even when the parenchyma cell 22 is inevitably mixed in the first layer 31, it is included in the scope of the present invention.

  The bamboo fibers 21 included in the first layer 31 are preferably mainly made of bamboo long fibers 21L. This is because the cotton-like bamboo short fibers 21 </ b> S are likely to fall off when forming a nonwoven fabric together with the thermoplastic resin fibers 33. Moreover, it is for preventing the rigidity of the 1st layer 31 falling by mixing the bamboo short fiber 21S. However, in the defibrator 111 of the embodiment, the bamboo length fibers 21L and the bamboo short fibers 21S / soft cells 22 are separated using the difference in specific gravity. It may be mixed into the first layer 31 by being entangled with the fibers 21L. Thus, even if the bamboo short fibers 21S are mixed in the first layer 31, it is included in the scope of the present invention.

  The second layer 32 only needs to contain at least the parenchyma cells 22, but further contains bamboo fibers 21 having an average fiber length shorter than the average fiber length of the bamboo fibers 21 included in the first layer 31. It may be. As described above, the bamboo short fibers 21 </ b> S are preferably not included in the first layer 31 in order to prevent the rigidity of the first layer 31 from decreasing. Therefore, in the present embodiment in which the bamboo long fibers 21L and the bamboo short fibers 21S are separated, from the viewpoint of effectively using the bamboo material 20, the bamboo fibers 21 included in the second layer 32 are the first ones. The bamboo short fibers 21S to be excluded from the layer 31 are mainly used.

  Referring to FIG. 1 again, the laminated portion 120 includes a first laminated portion 121 that forms a first layer 31 containing bamboo long fibers 21L and thermoplastic resin fibers 33, and soft cells 22 and bamboo short fibers 21S. And a second stacked portion 122 that forms the second layer 32 containing the. In order to laminate the first layer 31, the second layer 32, and the first layer 31 in this order to form a mat, the two first stacked portions 121 and the one second stacked portion 122 are The first stacked unit 121, the second stacked unit 122, and the first stacked unit 121 are arranged in this order.

  The first laminated portion 121 is a thin blender 123 in which the bamboo long fibers 21L and the thermoplastic resin fibers 33 are mixed, and the bamboo long fibers 21L and the thermoplastic resin fibers 33 are uniformly mixed from the material kneaded by the blender 123. And a card machine 124 for producing a nonwoven fabric. The blender 123 is supplied with bamboo long fibers 21L that are separated and collected in the second container 117. Although the thermoplastic resin fiber 33 is not specifically limited, For example, PP (polypropylene) fiber can be mentioned. The diameter of the thermoplastic resin fiber 33, the ratio with the bamboo long fiber 21L, and the like can be appropriately selected according to the characteristics required for the product. The non-woven fabric that has come out of the card machine 124 of the first stacking unit 121 is stacked with a cross layer 125.

  The second laminated portion 122 includes a hopper 126 that mixes the parenchyma cells 22 and the bamboo short fibers 21 </ b> S and supplies the soft cells 22 and the bamboo short fibers 21 </ b> S so as to pour onto the first layer 31 to form the second layer 32. The hopper 126 is supplied with the parenchyma cells 22 and the bamboo short fibers 21S that are separated and collected in the first container 116.

  Since the soft cells 22 and the bamboo short fibers 21S have a small specific gravity, they are likely to be scattered when supplied from the hopper 126, and it is difficult to stably and quantitatively deposit on the first layer 31. Therefore, the second lamination part 122 of the lamination part 120 is provided with a spray nozzle 150 (corresponding to an injection part) for injecting water 151 for moistening the soft cells 22 and the bamboo short fibers 21S. By laminating the soft cells 22 and the bamboo short fibers 21S on the first layer 31 while being wetted by the water 151 sprayed from the spray nozzle 150, the soft cells 22 and the bamboo short fibers 21S are stably and quantitatively lowered. The second layer 32 that is homogeneous can be formed. The spray nozzle 150 is arranged in the vicinity of the outlet of the hopper 126 so that the soft cells 22 and the bamboo short fibers 21S supplied from the hopper 126 are moistened with water 151. Although it is possible to wet with the water 151 in the hopper 126, in order to uniformly place the parenchyma cells 22 and the bamboo short fibers 21S on the first layer 31, the parenchyma cells 22 coming out of the hopper 126 and It is preferable to moisten the bamboo short fibers 21S.

  The spray of water 151 from the spray nozzle 150 may be continuous or intermittent. The state of the injected water 151 may be either a water droplet or a mist. The amount of water 151 sprayed can be set as appropriate, and is, for example, about 1% of the weight of the supplied soft cells 22 and bamboo short fibers 21S. The liquid for moistening the parenchyma cells 22 and the bamboo short fibers 21S is not limited to the water 151, prevents the parenchyma cells 22 and the bamboo short fibers 21S from being scattered, and the parenchyma cells 22 and the bamboo short fibers 21S. An appropriate liquid can be selected as long as it can be uniformly placed on one layer 31. For example, a liquid containing an additive or an adhesive that gives some viscosity to prevent scattering may be used.

  A pair of heat rolls 131 are arranged in the press unit 130. A board body in which the first layer 31, the second layer 32, and the first layer 31 are integrated by pressing the laminated structure 30 with a pair of heat rolls 131 and applying heat (heat compression molding). 40 is formed. Although heating temperature can be suitably set according to the material of the thermoplastic resin fiber 33 to be used, the pressing force which presses the laminated structure 30 from both sides, the pressurization time, etc., it is about 160 to 200 degreeC, for example.

  A molding die 141 having an inner surface shape that matches the outer shape of the product shape is disposed in the molding portion 140. A product shape is imparted to the board body 40 by pressing the board body 40 in the mold 141.

  Next, the manufacturing procedure of the bamboo fiber-containing resin molded body 10 will be described.

  The manufacturing procedure of the bamboo fiber-containing resin molded body 10 according to the embodiment includes a fiberizing process, a matting process, a boarding process, and a productizing process, if outlined. First, bamboo fiber 21 and parenchyma cell 22 are obtained by fiberizing bamboo material 20 (fibrosis process). Next, it has the 1st layer 31 containing the bamboo fiber 21 and the thermoplastic resin fiber 33, and the 2nd layer 32 containing the parenchyma cell 22, The 1st layer 31, the 2nd layer 32, the laminated structure 30 formed by laminating the first layer 31 in this order is formed (matting step). In this matting step, the second layer 32 is formed by laminating the soft cells 22 on the first layer 31 while moistening with the water 151. Next, the laminated structure 30 is integrally pressed to obtain the board body 40 (boarding process). And a product shape is provided to the board body 40 and a product is obtained (product production process). In the embodiment, the second layer 32 further contains bamboo fibers 21 having an average fiber length shorter than the average fiber length of the bamboo fibers 21 included in the first layer 31. For this reason, in the matting step, the second layer 32 is moistened on the first layer 31 by the water 151 jetted from the jet section 150 with the soft cells 22 and the bamboo fibers 21 having a short average fiber length. It is formed by stacking. Details will be described below.

  In the fiberizing step, the bamboo material 20 softened through cutting, delignification treatment, and pressing is defibrated by the defibrator 111. Using the difference in specific gravity, the parenchyma cells 22 and the bamboo short fibers 21S are sorted into the first container 116 and the bamboo long fibers 21L are collected into the second container 117 to be collected.

  In the matting step, the first layer 31 containing the bamboo long fibers 21L and the thermoplastic resin fibers 33 is formed by the first first laminated portion 121, and the soft cells 22 are formed by the second laminated portion 122. The second layer 32 containing the bamboo short fibers 21S is formed on the first layer 31, and the bamboo first fibers 21L and the thermoplastic resin fibers 33 are contained by the second first laminated portion 121. A first layer 31 is formed on the second layer 32. The bamboo long fibers 21L collected in the second container 117 and the thermoplastic resin fibers 33 are mixed by the blender 123 of the first laminated portion 121, and the bamboo long fibers 21L and the thermoplastic resin fibers 33 are uniformly distributed by the card machine 124. A thin non-woven fabric mixed in is prepared. The soft cells 22 and the short bamboo fibers 21S collected in the first container 116 are mixed and supplied to the first layer 31 by the hopper 126 of the second laminated portion 122. At this time, the soft cells 22 and the short bamboo fibers 21S are laminated on the first layer 31 while being wetted by the water 151 sprayed from the spray nozzle 150, thereby forming the second layer 32. As a result, the parenchyma cells 22 and the bamboo short fibers 21S can be stably and quantitatively deposited on the first layer 31, and the homogeneous second layer 32 can be formed. Moreover, scattering of the soft cells 22 and the bamboo short fibers 21S can be suppressed, and the workability is also good.

  In the boarding process, the laminated structure 30 is pressed by a pair of heat rolls 131 to apply heat. Thereby, the board body 40 in which the first layer 31, the second layer 32, and the first layer 31 are integrated is formed. A part of the thermoplastic resin fibers 33 in the first layer 31 is entangled with the parenchyma cells 22 and the bamboo short fibers 21S in the second layer 32 by hot pressing, so that the first layer 31, the second layer 32, the second layer 32, One layer 31 is united.

  In the product production process, the board body 40 is press-molded by the molding die 141 to obtain a product.

  Referring to FIG. 3, the manufactured bamboo fiber-containing resin molded body 10 includes bamboo fibers 21 and soft cells 22 obtained by fiberizing bamboo material 20, and thermoplastic resin fibers 33. The intermediate layer 12 is sandwiched between the surface layers 11, and the ratio of the parenchyma cells 22 contained in the intermediate layer 12 is larger than that of the surface layer 11. Further, the average fiber length of the bamboo fibers 21 contained in the intermediate layer 12 is shorter than the average fiber length of the bamboo fibers 21 contained in the surface layer 11. In the boarding step described above, a part of the thermoplastic resin fibers 33 in the first layer 31 is entangled with the soft cells 22 and the bamboo short fibers 21S in the second layer 32 to form the intermediate layer 12, and this intermediate layer The first layer 31 sandwiching 12 forms a pair of surface layers 11. The surface layer 11 has a thickness of 20% to 30% from the surface with respect to the thickness of the bamboo fiber-containing resin molded body 10, and includes thermoplastic resin fibers 33 and bamboo long fibers 21L. The middle layer 12 at the center includes thermoplastic resin fibers 33, bamboo long fibers 21 </ b> L, bamboo short fibers 21 </ b> S, and parenchyma cells 22.

  In the intermediate layer 12, the ratio of the parenchyma cells 22 contained is larger than that of the surface layer 11, and the rigidity is lower than that of the surface layer 11. However, since the bamboo fiber-containing resin molded body 10 has a structure in which the intermediate layer 12 having a relatively low rigidity is sandwiched between the surface layers 11 having a relatively high rigidity, the bamboo material 20 is also formed using the soft cells 22. It is possible to use without waste and to sufficiently ensure the rigidity of the molded body 10 as a whole.

  The intermediate layer 12 also has an average fiber length of the bamboo fibers 21 contained shorter than the average fiber length of the bamboo fibers 21 contained in the surface layer 11, and the rigidity is lower than that of the surface layer 11 also in this respect. However, since the bamboo fiber-containing resin molded body 10 has a structure in which the intermediate layer 12 having a relatively low rigidity is sandwiched between the surface layers 11 having a relatively high rigidity, short fiber having a relatively short average fiber length is also included. It is possible to use the bamboo material 20 without waste and to sufficiently ensure the rigidity of the molded body 10 as a whole.

  By using cotton-like or powder-like parenchyma cells 22 and cotton-like short fibers as the material of the intermediate layer 12, the molded body 10 as a whole can be sufficiently lightened and the molded body 10 can be reduced in weight. Can be planned.

  The blending ratio of the bamboo long fibers 21L of the surface layer 11 is, for example, 40 to 60%, and the blending ratio of the thermoplastic resin fibers 33 of the surface layer 11 is preferably, for example, 60 to 40%. This is because the thermoplastic resin fibers 33 and the bamboo long fibers 21L are entangled with each other, so that sufficient bonding strength can be obtained. Furthermore, it is because a skin layer is formed on the surface layer 11 at the time of heat compression molding, and sufficient rigidity can be obtained and the smoothness of the appearance can be improved. Moreover, in the case where a skin (not shown) that improves designability is simultaneously molded on the surface layer 11, the thermoplastic resin fiber 33 functions as a binder to ensure a sufficient adhesion area between the skin and the surface layer 11. This is because the adhesion between them can be improved.

  The blend ratio of the bamboo material 20 in the intermediate layer 12 is 20-30% for the bamboo long fibers 21L, 30-30% for the soft cells 22 and the short bamboo fibers 21S, and the blend ratio of the thermoplastic resin fibers 33 in the intermediate layer 12 is For example, it is preferable that it is 50 to 30%. This is because it is possible to reduce the weight of the molded body 10 while sufficiently securing the rigidity of the molded body 10 as a whole.

  For the thermoplastic resin fiber 33 of the surface layer 11, it is preferable to use PP fiber or recycled PP fiber. This is because it is a general-purpose resin, so that raw materials are easily available, and the manufacturing cost of the bamboo fiber-containing resin molded body 10 can be reduced. Moreover, it is because it becomes possible to reduce the generation amount of a carbon dioxide and the usage-amount of exhaustible resources by using a recycled material.

  As described above, according to the bamboo fiber-containing resin molded body 10 of the present embodiment, the bamboo fiber 21 and the soft cells 22 obtained by fiberizing the bamboo material 20 and the thermoplastic resin fiber 33 are included, and a pair The intermediate layer 12 is sandwiched between the surface layers 11, and the ratio of the parenchyma cells 22 contained in the intermediate layer 12 is larger than that of the surface layer 11. Since the intermediate layer 12 having a relatively low rigidity is sandwiched between the surface layers 11 having a relatively high rigidity, the bamboo material 20 can be used without waste using the soft cells 22 and the molded body 10 as a whole. Can be ensured. By using the soft cells 22 as the material for the intermediate layer 12, weight reduction of the molded body 10 can also be achieved.

  Moreover, since the average fiber length of the bamboo fiber 21 contained in the intermediate layer 12 is the bamboo fiber-containing resin molded body 10 shorter than the average fiber length of the bamboo fiber 21 contained in the surface layer 11, only the bamboo long fiber 21L is used. In addition, the bamboo short fibers 21S can be used to make more efficient use of the bamboo material 20 and to ensure the rigidity of the molded body 10 as a whole. By using the soft cells 22 and the bamboo short fibers 21S as the material of the intermediate layer 12, the weight of the molded body 10 can be reduced.

  According to the manufacturing method and manufacturing apparatus 100 of the bamboo fiber-containing resin molded body 10 of the present embodiment, the soft cell 22 is laminated on the first layer 31 while being wetted with the water 151 to form the second layer 32. Therefore, the parenchymal cells 22 can be uniformly laminated on the first layer 31 without scattering, and the parenchymal cells 22 can be handled easily. Accordingly, it is possible to manufacture the bamboo fiber-containing resin molded body 10 using the bamboo material 20 without waste, ensuring the rigidity of the molded body 10 as a whole, and reducing the weight.

  The second layer 32 further contains bamboo fibers 21 having an average fiber length shorter than the average fiber length of the bamboo fibers 21 included in the first layer 31, that is, bamboo short fibers 21S. Since the second layer 32 is formed by laminating the bamboo short fibers 21S on the first layer 31 while being moistened with water 151, the first cells without scattering the soft cells 22 and the bamboo short fibers 21S. It can be uniformly laminated on the layer 31, and the soft cells 22 and the short bamboo fibers 21S can be easily handled. Accordingly, it is possible to manufacture the bamboo fiber-containing resin molded body 10 that uses the bamboo material 20 more efficiently, ensures the rigidity of the molded body 10 as a whole, and achieves weight reduction.

(Modification example)
In the embodiment described above, the thermoplastic resin fibers are not included when the second layer 32 of the laminated structure 30 is formed, but the soft cells 22 and the bamboo short fibers 21S are further made to contain thermoplastic resin fibers. May be. In this case, the thermoplastic resin fibers of the second layer 32 include resin fibers having a melting point lower than that of the thermoplastic resin fibers 33 of the first layer 31, such as PE (polyethylene) fibers and low melting point PET (polyethylene terephthalate). Etc. are preferably used. By using a thermoplastic resin fiber having a low melting point for the second layer 32, it is easy to melt at the time of heat compression molding, a sufficient binder effect is obtained, and it is effective to prevent peeling between the surface layer 11 and the intermediate layer 12. It is. Furthermore, by using resin fibers having relatively high rigidity such as PE resin, the rigidity of the entire molded body 10 can be further enhanced through increasing the strength of the intermediate layer 12 itself.

  When the second layer 32 includes thermoplastic resin fibers, the fiber diameter of the thermoplastic resin fibers of the second layer 32 is smaller than the fiber diameter of the thermoplastic resin fibers 33 of the first layer 31. It is preferable to do. By using a small-diameter thermoplastic resin fiber for the second layer 32, it is easy to melt at the time of heat compression molding, a sufficient binder effect is obtained, and it is effective to prevent peeling between the surface layer 11 and the intermediate layer 12. is there.

  The number of stacked layers in the stacked structure 30 is not limited to the above-described three layers, and may be increased or decreased according to the strength required for the molded body 10 as long as it is two or more layers of the first layer and the second layer. Can do. That is, the bamboo fiber-containing resin molded article is a two-layer laminate including bamboo fibers and parenchymal cells obtained by fiberizing bamboo material and thermoplastic resin fibers, and at least the proportion of parenchymal cells contained is different. What is necessary. Even in such a bamboo fiber-containing resin molded body, since it consists of a two-layer laminate having at least different proportions of parenchymal cells, the bamboo material can be used without waste using parenchymal cells, and the entire molded body The rigidity as can be ensured. Moreover, weight reduction of a molded object can also be achieved by using a parenchyma cell. The stacked structure 30 only needs to include at least one stacked unit in which the first layer 31 and the second layer 32 are stacked. Therefore, the first, first, second, first, and first layers 31, 31, 32, 31, and 31 may be stacked according to the required strength, or the first and second layers may be stacked. The first, second, and first layers 31, 32, 31, 32, and 31 may be stacked.

10 Bamboo fiber-containing resin molding,
11 Surface,
12 Middle layer,
20 bamboo,
21 bamboo fiber,
21L bamboo long fiber,
21S bamboo short fiber,
22 soft cells,
30 laminated structure,
31 first layer,
32 second layer,
33 thermoplastic resin fibers,
40 Board body,
100 Bamboo fiber-containing resin molded body manufacturing equipment,
110 Fiberizing section,
111 defibrator,
112 conveyor,
113 feed roll,
114 pin roll,
115 dust collector,
116 first container,
117 second container,
120 stacking section,
121 the first laminated section,
122 second laminated portion,
123 Blender,
124 card machine,
125 cross layer,
126 hopper,
130 press section,
131 heat rolls,
140 molded parts,
141 mold,
150 spray nozzle (injection part),
151 Water (liquid).

Claims (8)

Bamboo fiber-containing resin molding using bamboo fiber and soft cells obtained by fiberizing bamboo material ,
A bamboo fiber-containing resin molded article comprising a two-layer laminate comprising the bamboo fiber, the parenchymal cell, and a thermoplastic resin fiber, wherein the proportion of the parenchymal cell contained in each layer is different . Bamboo fiber-containing resin molding using bamboo fiber and soft cells obtained by fiberizing bamboo material ,
It has a laminated structure in which an intermediate layer is sandwiched between a pair of surface layers,
The surface layer includes the bamboo fiber and a thermoplastic resin fiber,
The intermediate layer is a bamboo fiber-containing resin molded product comprising the soft cells and thermoplastic resin fibers .   The surface layer further includes the parenchyma cells,
  The bamboo fiber-containing resin molded article according to claim 2, wherein the ratio of the parenchymal cells contained in the intermediate layer is larger than that of the surface layer.   The intermediate layer further includes the bamboo fiber,
  The bamboo fiber-containing resin molded article according to claim 2, wherein an average fiber length of the bamboo fibers contained in the intermediate layer is shorter than an average fiber length of the bamboo fibers contained in the surface layer.   Obtaining bamboo fiber and parenchyma by fiberizing bamboo material;
  A first layer containing the bamboo fibers and thermoplastic resin fibers; and a second layer containing the parenchymal cells, the first layer, the second layer, and the first layer. Forming a laminated structure in which the layers are laminated in this order;
  A step of integrally pressing the laminated structure to obtain a board body,
  In the step of forming the laminated structure, the second layer is formed by laminating the soft cells on the first layer while moistening the soft cells with a liquid. Method.   The second layer further contains bamboo fibers having an average fiber length shorter than an average fiber length of the bamboo fibers included in the first layer;
  6. The step of forming the laminated structure, wherein the second layer is formed by laminating the soft cells and bamboo fibers on the first layer while moistening with a liquid. Of manufacturing bamboo fiber-containing resin moldings.   A fiberizing part for obtaining bamboo fibers and parenchyma cells by fiberizing bamboo material;
  A first layer containing the bamboo fibers and thermoplastic resin fibers; and a second layer containing the parenchymal cells, the first layer, the second layer, and the first layer. A laminated portion forming a laminated structure in which the layers are laminated in this order;
  A press unit that integrally presses the laminated structure to obtain a board body,
  The stacking unit includes a spray unit that sprays a liquid that wets the parenchyma cells that are stacked on the first layer, and the second layer is disposed on the first layer. An apparatus for manufacturing a bamboo fiber-containing resin molded body, which is formed by laminating while being wetted by the liquid ejected from the ejection section.   The second layer further contains bamboo fibers having an average fiber length shorter than an average fiber length of the bamboo fibers included in the first layer;
  The said lamination | stacking part is formed by laminating | stacking the said 2nd layer on the said 1st layer, moistening the said soft cell and bamboo fiber with the liquid which injected from the said injection part. The manufacturing apparatus of the bamboo fiber containing resin molding of description.

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