JP5219938B2 - Areca palm bark molded product manufacturing method, Areca palm bark molded product, and molding raw material for Areca palm bark molded product - Google Patents

Description

  The present invention relates to a molded article such as tableware and containers mainly composed of bark of areca palm (also known as coconut bamboo, madrid palm, scientific name: Dypsis Lutescens), a molding raw material for molding, and a molding method thereof.

  One of the measures to improve the global environment is the development of oil-free products that accompany the reduction of carbon dioxide. For example, if lifestyle-related products using the bark of plants, which are natural resources, are provided and made into daily products, this will lead to an improvement in the global environment by deoiling products.

  As a new method for using such bark, a container made of coconut bark is conventionally disclosed by press-molding areca bark under heat. This container is said to be obtained by heating the bark at 120 to 250 ° C. for 1 minute or longer and press-molding at a pressure of 0.001 to 0.003 MPa (for example, see Patent Document 1). In view of the fact that the bark or stem bark of palm tree bark, which is a coconut bark, is thicker than the leaves of ordinary plants, it is press-molded under high temperature and high pressure to provide sufficient sterilization power and good molding, It is hardened to such an extent that it has a necessary and sufficient structural strength.

JP 2002-068160 A

  However, the above-mentioned bark container is made in view of the fact that the areca bark is thicker than the leaves of ordinary plants in the palm family, and the collected bark of each size is used. Since the processing is performed as it is, the size of the product is limited by the size of the bark, and the size and shape vary from product to product. If there is such a variation, there arises a difficulty that it cannot be used for a wide and stable application.

  The above-mentioned areca bark belongs to the genus Belox (scientific name: Areca cat etch), and the bark is not easily pulverized uniformly, and the one reshaped after pulverization may be deformed by repeated heating.

  Therefore, in the present invention, the size of the product is not limited by the size and shape of the bark to be collected, and is composed of an equal component having predetermined heat resistance and strength even after re-molding, and is used for a wide and stable application. It is an object of the present invention to provide an areca palm bark molded product, a molding raw material for the molded product, and a production method capable of stably obtaining this.

The present invention employs the following means (1) to (5) in order to solve the above problems.
(1) The molded product of bark of Areca palm of the present invention is a defibrating step of defibrating the dried bark 1 of Areca palm to form cotton-like fibers 2;
A preparation step of dispersing the cotton-like fiber 2 in the dispersion preparation liquid to form the dispersion preparation liquid 3;
A paper-making process in which the dispersion preparation liquid 3 is dehydrated to make a wet web into a long web,
A primary pressing step in which the long wet paper web 4 is sequentially flat-pressed by a predetermined amount of press to perform initial dehydration;
A laminating step in which the dewatering web 5 after the initial dewatering is stacked in a zigzag manner in order of the length of the press;
A secondary press step of heat-molding the laminated web 6 after lamination into a predetermined three-dimensional shape by a predetermined three-dimensional molding press;
It is preferable to obtain by the manufacturing method which comprises sequentially.

(2) In the method for manufacturing a bark molded article, it is preferable to perform a three-dimensional molding press after drying the laminated web 6 with a steam heating dryer in the secondary press step after the lamination step.

(3) In the method for manufacturing a bark molded product, in the defibrating process, the cotton-like fibers are beaten (refined) to a specific surface area of 3.0 m ² / g or more with a refiner, and each piece has a plurality of incisions. Thus, it is preferable to obtain an external fibrillated cotton-like fiber 2.

The dispersion preparation liquid in the preparation step is preferably an aqueous solution containing 5 to 10 parts by weight of a surfactant and 30 to 50 parts by weight of sodium rhodanate.
In the method for producing a bark molded article, the dried bark is preferably obtained by subjecting the withered and fallen Areca bark to low-temperature steaming treatment within 1 hour. The low-temperature steaming process is a process in which the inside of the steaming can is brought to a low pressure state and is filled with the low-temperature steam, and the Areca bark is steamed with steam without being heated at a high temperature in the steaming can.

  In addition, instead of the low-temperature steaming treatment or instead of the low-temperature steaming treatment, a 1 to 10% monohydric alcohol solution is hydrated to a moisture content of 20% or more and then volatilized and dried under non-heating conditions. Good.

  Moreover, it is preferable that the three-dimensional molding press in a secondary press process is a thing by which the some shaping | molding container type | mold is adjacently arranged in the plane area | region of the press size of a primary press.

(4) Further, the bark molded article of the areca palm of the present invention is wet-papered dry bark of chrysalidocarpus genus Areca palm (scientific name Dypsi Luthescens) which has been defibrated into a cotton-like form, and is first press-printed. It is characterized by being press-molded by a hot press. Such a bark molded product can be obtained, for example, by any one of the production methods (1) to (3).

(5) Moreover, as a molding material for bark moldings of areca palm, the bark of areca palm 1 is defibrated to form cotton-like fibers 2, and the cotton-like fibers 2 are dispersed in the dispersion preparation liquid to obtain adjustment liquid 3, and adjustment liquid 3 can be obtained as a raw material plate before secondary press molding in which a dewatered paper is made into a long web, and the long web is laminated in a plurality of layers and punched in the thickness direction. Such a molding material for bark molding is obtained, for example, by a process excluding the secondary press process in the production method of any one of (1) to (3).

By the manufacturing method of the bark molding of the above areca palm , the size of the product is not limited by the size and shape of the bark to be collected, and it is composed of uniform components having predetermined heat resistance and strength even after re-molding. It is possible to stably obtain an Areca palm bark molded product or a molding raw material that can be used for a stable application.

Explanatory drawing to the drying and drainage process in the manufacturing method of the bark molding of Areca palm of this invention. Explanatory drawing to the finishing process in the manufacturing method of this invention. The enlarged view of the fibril structure of the bark molding of Areca palm of this invention.

Hereinafter, an embodiment of the molded bark of Areca palm will be described with each drawing shown as an example.

The bark molded product of the areca palm of the example is a remolded product derived from the bark obtained by paper-making one part of the areca palm (scientific name: DypsisLutescens) classified into the genus Chrysaliscalpus spp. Basically, each of the following steps is provided in order, or at least a defibration step or a lamination step is provided in order (FIGS. 1 to 2).
-A defibrating process in which the dried bark 1 of areca palm is defibrated to form cotton-like fibers 2.
A preparation process in which the cotton-like fiber 2 is dispersed in the dispersion preparation liquid to form the dispersion preparation liquid 3;
A paper making process in which the dispersion preparation liquid 3 is dehydrated and paper-made with a wire to form a wet web into a long web,
A primary pressing process in which the long wet paper 4 is subjected to planar pressing in order by a predetermined amount of press to perform initial dehydration,
A laminating process in which the dewatered web 5 after the initial dewatering is stacked in a zigzag manner in order of the length of the press, and flat pressing is performed;
A secondary press step of heat-molding the laminated web 6 after lamination into a predetermined three-dimensional shape by a predetermined three-dimensional molding press;
-The finishing process in which unnecessary portions are removed and partial surface treatment is performed.

(About Areca palm of the present invention)
Areca palm (Yamadori palm, Koganae palm) has a high degree of freedom of deformation when it is initially pressed by applying heat, while it has a feature of excellent shape retention after press curing at a predetermined pressure. Moreover, after hardening, it is excellent in heat resistance, the amount of shape distortion due to repeated heating and cooling is extremely small, and cutting after hardening is easy. This is a major feature not found in other bark such as bamboo. Furthermore, the areca palm used in the present invention is different from the palms of other genera such as the genus Areca, and after resolving and remolding the dead bark, the above shape retention, heat resistance, strain resistance, etc. It was found that the characteristics of the molded product were maintained. In the present invention, by utilizing the characteristics of this areca palm, a raw material of a molding material before processing is prepared by web processing using nonwoven fabric processing, and this is deformed to obtain a molded product. In addition, after the bark is dried, the fibers are once dissociated and processed into a web shape by paper making, and this is pressed in the thickness direction to obtain a molding raw material for a bark molded article made of a laminated molded article.

(About Areca fiber)
Areca palm-like fibers have a particularly good affinity with water, which is a dispersion medium, compared to other coconut fibers, so the deposition rate when forming a paper layer on the wire (mesh) increases, and moisture is efficiently removed. It becomes paper. The cotton-like fiber is preferably one having a specific surface area of at least 3.0 m ² / g or more by refining with a refiner.

  (Secondary pressing step) In the secondary pressing step, it is preferable to perform a three-dimensional molding press after drying the laminated web 6 with a steam heating dryer.

(Defibration process) In the defibration process, cotton fibers are beaten (refined) to a specific surface area of 3.0 m ² / g or more by a refiner D1, and each book has a plurality of indentations and is externally fibrillated. It is preferable to obtain the fiber 2.

  (Regarding the beating process) The beating process is performed by, for example, a beater structure in the refiner D1 in which a roll blade and a receiving blade are provided so as to be capable of power rotation with a predetermined gap therebetween. The beating process causes delamination, splitting, and fibrillation of the cotton-like fiber 2 so that a part of the fiber membrane is separated from the outside as shown in the enlarged side view of FIG. 3 (a). As shown in the enlarged cross-sectional view, a part of the separated portion is in a state of delamination due to splitting. By performing such a beating process, the fibril structures shown in FIG. 3 are intertwined with each other as shown in the final diagram of FIG. 2, so that the bark molded product 7 having high hardness and thermal stability and its A molding raw material 53 for molding can be obtained.

  In addition, it may be fibrillated by chemical treatment such as acid treatment or copper solution treatment instead of or together with the beating treatment. For example, finer fibrils are generated by acid treatment, and part of the fibrils are dissolved, whereby the high-strength cotton fibers 2 that are difficult to separate unnecessarily are obtained. In addition, the swollen cotton-like fibers 2 having different layer structures are included by the copper solution treatment.

(About drainage treatment)
Prior to the beating treatment, in order to improve the efficiency of the beating treatment, lignin may be removed from the surface of the dried bark by performing a drainage treatment using a bleaching solution. Areca palm bark contains a relatively large amount of hemicellulose, and therefore, when treated with drainage, it becomes easier to fibrillate.

(Paper making process)
Specifically, in the paper making process, a suspension stirring process by the pulper device D3 and a wet web making process by the multilayer paper making machine D4 are sequentially performed. Moreover, it is good also as what performs the span lace process by the span lace machine D42 after a wet web papermaking process as needed. Stirring is performed in the tank by a rotating stirring blade that rotates in the tank of the pulper device D3 so that the cotton-like fibers dispersed in the dispersion preparation liquid of the suspension are uniformly diffused and separated. This is a process of feeding the stirred solution to the input section of the paper machine (FIG. 2).

The mixing ratio in the raw material dispersion used for papermaking of the mixed paper of the present invention is preferably 40 parts by weight or more, but is appropriately set depending on the papermaking conditions.
(Dispersion preparation liquid)
A resin binder may be used for the dispersion preparation liquid. Examples of the resin binder in this case include polyvinyl alcohol, various acrylic ester resins, polyvinyl acetate, epoxy resins, urethane resins, and styrene / butadiene copolymer resins. The resin binder is applied as an external additive by a spray method, an impregnation method, a curtain coater method, or the like, or as an internal additive of a dispersion preparation liquid. In addition, it is provided with the inorganic filler for sealing as needed.

(About span lace processing)
The spunlace process is a process for increasing the entanglement of the fibers by jetting the wet paper discharged from the paper machine in the order in which the wet paper is discharged and transported by the spunlace machine 42D on the porous support material. The spunlace machine D42 includes a porous support material made of a wire or a perforated metal plate, and a high-pressure water jet ejector that ejects a high-pressure water flow from the upper position on the porous support material in a substantially vertical downward direction. When the discharged wet paper is carried on the porous support material, the fibers are evenly dispersed by the water hammer of the high-pressure water jet, and each fiber is in a non-oriented state in which the fibers are oriented in multiple directions. Although it is not an essential process for the papermaking process, a finer and finer web is formed and has excellent shape compatibility. Therefore, when molding into a relatively small molded product with a deep bottom or a complex shaped product. Span lace processing is performed.

  (About dry papermaking) In addition to the above-mentioned wet papermaking, it is also possible to employ dry papermaking using a card machine or the like as the papermaking process.

(Initial dehydration process and subsequent processes)
Thereafter, the wet paper web 4 is initially dehydrated while being transported in the up-down direction by the transport roller D43, and then is laminated in a zigzag manner in a predetermined press length by the flat press machine D5 as a laminating process, Flat press processing. Furthermore, as a secondary pressing step, the laminated web 53 after lamination is heat-molded into a collective molded product 6 having a predetermined three-dimensional shape by a predetermined three-dimensional molding press D6. Finally, as a finishing process, unnecessary portions of the three-dimensional aggregate molded product 6 are removed, and deburring and surface treatment are performed.

  In addition to the above, the flat pressing process is omitted, and the non-pressed laminated body folded in the laminating process is molded together with the flat pressing by the three-dimensional molding press D6 in the next secondary pressing process. Also good.

Hereinafter, the present invention will be described in detail with reference to examples. In the following examples, the paper was made using a two-layer long-mesh paper machine out of a multi-layer slanted-wire-type long-mesh paper machine.
The dried bark of Areca palm is defibrated, and the fibrillated one is adjusted with a dispersed aqueous solution and the viscosity is adjusted to 8 cps. Using a two-layer paper machine, it is mixed and made, and an acrylic resin binder is applied. A wet paper web having a basis weight of 100 g / m ² was obtained. After this wet paper web was spunlaced on a paper net, a plurality of webs were bonded together in a wet state. And it dried with the Yankee dryer, and obtained the resin molding material of 100 g / m < ² > of basic weight as a whole. Finally, this resin molding material was press-molded into a thin tray shape to obtain an Areca palm molded product. When this Areca palm molded product was repeatedly heated up to 250 degrees, no cracks or cracks were visually observed even after repeated up to 250 times. Moreover, the shape distortion rate of each side was 1% or less.

  Areca palm bark products produced by this production method are used in petroleum processing, such as food containers used as containers for generated foods, cup containers such as dried noodles in cups, cups and dishes used as disposable products, etc. Can replace all of the products. By becoming a development product of oil-free products, it is possible to meet social demands for measures against the natural environment.

  Although the configuration of the present invention is as described above, the present processing system is not limited to the above-described embodiment, and extraction of components, deletion of some components, replacement with an alternative configuration is made without departing from the gist of the present invention. Various changes such as the change of the object, the size and time, and the adjustment of the driving speed can be performed. The present invention includes a manufacturing method after these changes, a system comprising each manufacturing facility, and intermediate products such as a web before molding and a molding material plate.

DESCRIPTION OF SYMBOLS 1 Dry bark 2 Cotton-like fiber 3 Dispersion preparation liquid 4 Long wet paper 5 Dehydrated web 6 Laminated web 7 Bark molding

Claims (5)

A defibrating step of defibrating the dried bark 1 of Areca palm to form a cotton-like fiber 2, a preparation step of dispersing the cotton-like fiber 2 in a dispersion preparation liquid to form a dispersion preparation liquid 3, and dispersion preparation A paper making process for dehydrating paper 3 to form a wet web into a long web, an initial dewatering process for initially dewatering the long wet paper 4, and a dewatered web 5 after the initial dewatering for each press length. Manufacture of areca palm bark molded product comprising a laminating step of sequentially folding and laminating in order and a secondary press step of heat-molding the laminated web 6 after lamination into a predetermined three-dimensional shape by a predetermined three-dimensional molding press Method. The manufacturing method of the bark molding of Areca palm of Claim 1 which performs a three-dimensional shaping | molding press after drying the lamination | stacking web 6 with a steam heating dryer in the secondary press process after a lamination | stacking process. 3. The method for producing an areca palm bark molded article according to claim 1 or 2, wherein in the defibrating step, the cotton-like fibers are beaten to a specific surface area of 3.0 m ² / g or more by a refiner to obtain the external fibrillated cotton-like fibers 2. Areca palm bark molded product, which is made by wet-making the dried bark of Areca palm that has been defibrated into a cotton-like shape and first pressing it, and then press-molding a plurality of these by hot pressing. Areca palm bark 1 is defibrated into cotton-like fibers 2, cotton-like fibers 2 are dispersed in a dispersion preparation liquid to prepare adjustment liquid 3, and adjustment liquid 3 is dehydrated to make a long web. Molding raw material for bark moldings of Areca palm, which is made by laminating multiple scale webs and punching them in the thickness direction.

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