Pulp molded body

Abstract

The objective is to provide a pulp molded body with high reflectivity that can efficiently diffuse light. [Solution] The present invention is a pulp molded article having a total light reflectance of 50% or more at a wavelength of 555 nm.

Description

[Technical Field]

[0001] This invention relates to a pulp molded article. [Background technology]

[0002] In recent years, marine pollution caused by plastic waste has become a problem, and there is a demand for plastic-free products. For example, in furniture, there is a demand for paper products such as cardboard shelves and tables, partly because they are easy to dispose of. Among paper products, pulp molded products are particularly suitable because they have excellent moldability and are environmentally friendly. [Overview of the project] [Problems that the invention aims to solve]

[0003] Pulp molded products have traditionally been used as packaging and cushioning materials, but their use in various other applications is also being considered. The inventors of this invention focused on the fact that pulp molded products can change the direction of light and brighten a room, and can serve as reflective materials such as lampshades, and discovered that in order for pulp molded products to function sufficiently as reflective materials, it is preferable that the total light reflectance be above a predetermined value.

[0004] The object of the present invention is to provide a pulp molded article that has high reflectivity and can efficiently diffuse light. [Means for solving the problem]

[0005] The pulp molded article according to the present invention is as follows: <1> ~ <7> It has the following configuration.

[0006] <1> A pulp molded article characterized by having a total light reflectance of 50% or more at a wavelength of 555 nm.

[0007] <2> It is characterized by having a diffuse reflectance of 50% or more at a wavelength of 555 nm. <1> Pulp molded articles as described above.

[0008] <3> It is characterized by having a total light transmittance of 1.0% or more at a wavelength of 555 nm. <1> Pulp molded articles as described above.

[0009] <4> Density is 0.45 g / cm³ 3 More than 1.0g / cm 3 The following characteristics <1> Pulp molded articles as described above.

[0010] <5> It is characterized by having a thickness of 500 μm or more and 1500 μm or less. <1> Pulp molded articles as described above.

[0011] <6> The pulp blend (LBKP / NBKP) of bleached hardwood kraft pulp (LBKP) to bleached softwood kraft pulp (NBKP) is characterized by being 30 / 70 or more and 100 / 0 or less. <1> Pulp molded articles as described above.

[0012] <7> <1> ~ <6> The pulp molded article described in any of the above is a reflective member for lighting and is a lampshade. [Effects of the Invention]

[0013] The pulp molded article according to the present invention has a high reflectivity when used as a reflective material, making it possible to reflect light efficiently. Furthermore, because it is made of paper, it can be disposed of and recycled in a way that is considerate of the global environment. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of a ceiling lighting fixture using a reflective member according to one embodiment of the present invention. [Figure 2] Figure 1 is a side view of the ceiling lighting fixture shown. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments for implementing the present invention will be described in detail with reference to FIGS. 1 and 2. However, the present invention is not limited to the aspects of this embodiment.

[0016] In the description of this specification and the claims, the "pulp molded body" is a molded body made of pulp, and the "reflective member" includes devices that reflect light, such as lamp shades and reflector plates.

[0017] Hereinafter, a form in which the pulp molded body is used as a lamp shade, which is an example of a (lighting) reflective member, will be described.

[0018] [Structure] FIG. 1 is a perspective view of a ceiling lighting fixture 1 using a reflective member 2 according to an embodiment of the present invention, and FIG. 2 is a side view of the ceiling lighting fixture 1 shown in FIG. 1. In FIG. 2, for convenience of explanation, the reflective member 2 is cut, and the lamp 4 and the cord 3 are visualized.

[0019] The reflective member (hereinafter also referred to as "lamp shade") 2 according to this embodiment is a pulp molded body, and as shown in FIGS. 1 and 2, it is used in the ceiling lighting fixture 1. The ceiling lighting fixture 1 includes a plug 5 for supplying power from a ceiling power supply source, a cord 3 for supplying power from the plug 5 to a lamp (for example, an LED lamp) 4, a lamp 4, and an umbrella-shaped lamp shade 2 for reflecting and diffusing the light projected from the lamp 4. The lamp shade 2 is configured to cover the lamp 4 from above and has a hole through which the cord 3 passes at the center. In the present invention, it is not limited to being suspended from the ceiling, and for example, it can also be used for an umbrella for a lamp installed on a table.

[0020] As shown in FIGS. 1 and 2, the umbrella shape of the lamp shade 2 is dome-shaped, and the periphery is circular. In the present invention, it is not limited to this, and it may be conical or the shape can be set according to the type of lamp, the direction of light, the luminous flux, the luminous intensity, the luminance, the illuminance, etc. For example, if it is a rod-shaped lamp (for example, a fluorescent lamp), it can also be an elongated umbrella shape.

[0021] In the present invention, in order to achieve the effects of the invention, in the pulp molded body, it is preferable that the total light reflectance at a wavelength of 555 nm is 50% or more.

[0022] According to this configuration, when the pulp molded body is used as a reflection member, the reflectance becomes high, so that it is possible to efficiently reflect light. In addition, since it is made of paper, it can be disposed of and recycled in consideration of the global environment. Here, the total light reflectance can be said to contribute to brightness (returning light).

[0023] Further, according to this configuration, it is possible to increase the utilization efficiency of a light source (a lamp in the present embodiment). The adjustment of the total light reflectance can be achieved by changing the thickness, density, and surface roughness of the pulp molded body. The adjustment of the surface roughness can be achieved by changing the pulp composition or the like.

[0024] Although the design is shown in FIG. 1, the total light reflectance (and the diffuse reflectance and total light transmittance described later) referred to here is for the case of a plain surface. The pulp molded body is preferably white, but it is also possible to apply a design as described later.

[0025] In the present invention, in order to achieve the effects of the invention, in the pulp molded body, it is preferable that the diffuse reflectance at a wavelength of 555 nm is 50% or more.

[0026] According to this configuration, it is possible to diffuse highly directional light to realize soft light, and to obtain natural light such as light without unevenness, gentle to the eyes, and having an atmosphere (warmth). The adjustment of the diffuse reflectance can be achieved by changing the thickness, density, surface roughness, etc. of the pulp molded body. Here, the diffuse reflectance can be said to contribute to the unevenness (uniformity) of light.

[0027] The lampshade 2 according to this embodiment is capable of transmitting light from the inside. As shown in Figure 1, the lampshade 2 has a floral design on the inside, and the light projected from the lamp 4 is reflected on the inside while transmitting the light outwards, making the inner design stand out on the outside.

[0028] In this invention, to achieve the effects of the invention, it is preferable that the total light transmittance at a wavelength of 555 nm is 1.0% or more in the pulp molded article.

[0029] This configuration allows light to pass through the lampshade, making it brighter, more aesthetically pleasing, and adding design appeal. The resulting warm and inviting light enhances the room's atmosphere. The total light transmittance can be adjusted by changing the thickness and density of the pulp molded body.

[0030] In the present invention, in a pulp molded article, the upper limit of the total light transmittance at a wavelength of 555 nm is preferably 50% or less, more preferably 30% or less, and even more preferably 2% or less, in order to obtain sufficient brightness for the workspace or room when using a lampshade (or to reduce the light transmitted through the lampshade and improve the efficiency of the light source).

[0031] The inventors have found a pulp molded product suitable for reflective components (lampshades) by optimizing the material and physical properties.

[0032] [Method for measuring optical properties] To measure the optical properties, a V-770 UV-Vis-Near-Infrared Spectrophotometer (manufactured by JASCO Corporation) was used to measure the total reflectance spectrum, diffuse reflectance spectrum, and total transmission spectrum in the wavelength range of 300-850 nm, including visible light. Representatively, the values ​​at 555 nm, near the peak sensitivity of the human eye to brightness, were used as the total reflectance, diffuse reflectance, and total transmittance. A 60 mm diameter integrating sphere was used for the measurements, and Spectralon was used as the standard whiteboard. The data acquisition interval was set to 1 nm, and the bandwidth was set to 2 nm for UV and visible light, and 8 nm for near-infrared light. Each measurement value is the average of measurements taken at three predetermined locations on the pulp molded product.

[0033] The raw materials and manufacturing method of the pulp molded article according to this embodiment will be described below.

[0034] [Pulp raw materials] Examples of pulp raw materials for pulp molded articles include wood pulp, non-wood pulp, and recycled paper, with wood pulp and non-wood pulp being preferred. Here, the pulp raw material is the pulp that constitutes the pulp molded article.

[0035] Wood pulp generally refers to wood pulp used for papermaking, and is classified into the following categories based on differences in preparation methods: chemical pulp such as kraft pulp (KP), sulfite pulp (SP), and soda pulp (AP); semi-chemical pulp such as semi-chemical pulp (SCP) and chemigland wood pulp (CGP); and mechanical pulp such as crushed wood pulp (GP), thermomechanical pulp (TMP, BCTMP), and refiner-ground wood pulp (RGP).

[0036] Examples of wood pulp include coniferous pulp and hardwood pulp, depending on the raw materials. Examples of coniferous pulp include pulp obtained from the genera Abies, Pinus, etc. Examples of hardwood pulp include pulp obtained from the genera Acacia, Eucalyptus, and Populus (for example, poplar).

[0037] Among these, bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBKP) are more preferred as wood pulp.

[0038] In this invention, to achieve the effects of the present invention, it is preferable that the pulp blending ratio (LBKP / NBKP) of bleached hardwood kraft pulp (LBKP) to bleached softwood kraft pulp (NBKP) in the wood pulp constituting the pulp molded article is 30 / 70 or more and 100 / 0 or less. By keeping the pulp blending ratio within this range, the smoothness and dispersibility are improved. The pulp blending ratio affects the reflectance, transmittance, and absorptiveness. From the viewpoint of the surface properties of the product, a higher proportion of LBKP is more preferable.

[0039] In this embodiment, from the viewpoint of the smoothness of the resulting pulp molded article, wood pulp from the genera Acacia and Eucalyptus is preferred as the hardwood pulp. One type of hardwood pulp may be used alone, or two or more types may be used in combination.

[0040] In this embodiment, by including coniferous tree pulp as the pulp raw material, a pulp molded article with superior strength and oil resistance can be obtained. As for the coniferous tree pulp, pine pulp is preferred in terms of strength and oil resistance, radiata pine is more preferred, and is suitable for kitchen lampshades. One type of coniferous tree pulp may be used alone, or two or more types may be used in combination.

[0041] When the pulp raw material is a mixed pulp of wood pulp and non-wood pulp, the wood pulp content in the pulp raw material is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, even more preferably 20% by mass or more, even more preferably 45% by mass or more, and preferably 95% by mass or less, more preferably 90% by mass or less, even more preferably 80% by mass or less, and even more preferably 55% by mass or less.

[0042] Non-wood pulp is a fiber extracted from the bark, stems, leaves, and leaf sheaths of plants. Specifically, this includes pulp obtained from cotton linters, cotton, linen, hemp, ramie, straw, esparto, Manila hemp, sisal hemp, jute, flax, kenaf, bamboo, bagasse, ganpi, mitsumata, kozo, and mulberry.

[0043] From the viewpoint of improving the oil resistance of the pulp molded article, the non-wood pulp preferably contains at least one selected from bagasse and bamboo, more preferably at least one selected from bagasse and bamboo, and even more preferably bagasse.

[0044] When the pulp raw material is a mixed pulp of wood pulp and non-wood pulp, the content of non-wood pulp in the pulp raw material is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, even more preferably 45% by mass or more, and preferably 95% by mass or less, more preferably 90% by mass or less, even more preferably 85% by mass or less, even more preferably 80% by mass or less, and even more preferably 55% by mass or less.

[0045] In this embodiment, it is preferable that the pulp raw material mainly consists of virgin pulp. By using virgin pulp as the main component, a pulp molded article with superior surface smoothness can be obtained. Note that "mainly consisting of virgin pulp" means that the virgin pulp content in the pulp raw material is preferably 80% by mass or more, more preferably 85% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and 100% by mass or less, and even more preferably 100% by mass.

[0046] While not particularly limited, bleached pulp and semi-bleached pulp are preferred as examples.

[0047] Furthermore, unbleached pulp has a high residual lignin content, resulting in low whiteness and increased total light absorption, which leads to a decrease in reflectivity and a tendency to be inferior in decorative properties. Therefore, the content of unbleached pulp in the pulp raw material is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, and most preferably not present at all (0% by mass).

[0048] On the other hand, in applications where strength, resistance to staining, and a natural texture are required, it is preferable to use unbleached pulp. In this case, the content of unbleached pulp in the pulp raw material is preferably more than 20% by mass, more preferably 50% by mass or more, and even more preferably 80% by mass or more (up to 100% by mass). In this case, at least one of bleached pulp and semi-bleached pulp may be used in combination with unbleached pulp.

[0049] Furthermore, if mercel pulp or cross-linked pulp is included as a pulp raw material, the strength and density of the pulp molded article tend to decrease. Therefore, the content of mercel pulp and cross-linked pulp in the pulp raw material is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, and most preferably not included at all (0% by mass).

[0050] Recycled paper pulp tends to have a high amount of residual ink and poor dispersibility. In addition, the fibers of recycled paper tend to be fuzzy and deformed. Furthermore, recycled paper pulp has low whiteness and a high total light absorption rate, leading to a decrease in reflectivity. This results in the presence of un-deinked fibers that appear long and black, with ink remaining on the pulp fibers, and a tendency for black whiskers to occur. In addition, dust may be visible due to residual gray vinyl and black spots. As a result, the appearance and surface smoothness of the resulting pulp molded articles tend to decrease. Therefore, the content of recycled paper pulp in the pulp raw material is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, and most preferably none (0% by mass).

[0051] In this embodiment, the Canadian Standard Freeness (CSF) of the pulp raw material is preferably 100 mL or more, more preferably 150 mL or more, and even more preferably 200 mL or more, from the viewpoint of pulp raw material productivity and papermaking properties during the production of pulp molded articles, and preferably 600 mL or less, more preferably 520 mL or less, even more preferably 450 mL or less, even more preferably 400 mL or less, and even more preferably 300 mL or less, from the viewpoint of surface smoothness. Surface quality may deteriorate if the CSF is higher than 600 mL.

[0052] Regarding CSF, as the beating process progresses, it becomes transparent, meaning its opacity decreases. CSF affects reflectance, transmittance, and absorptiveness.

[0053] The degree of reflexology should be adjusted so that the CSF falls within the above range.

[0054] CSF is measured in accordance with JIS P 8121-2:2012. For bleached pulp, white is preferred due to its high reflectivity. In this invention, to achieve the effects of the present invention, it is preferable that the copper number of the pulp molded article be between 1 and 20.

[0055] [Other ingredients] Pulp molded articles are formed primarily from the pulp mentioned above. Pulp molded articles may be formed from 100% pulp, but they may also be made by blending pulp with other components such as various internal additives.

[0056] Other components include inorganic substances such as talc and kaolin, inorganic fibers such as glass fibers and carbon fibers, synthetic resin powders or fibers such as polyolefins, polysaccharides such as carboxymethylcellulose, sizing agents, wet strength enhancers, dry strength enhancers, oil resistant agents, yield enhancers, water filtration enhancers, bulk enhancers, aluminum sulfate, pH adjusters, pitch control agents, slime control agents, and colorants such as pigments. It is preferable to include a sizing agent as another component.

[0057] Examples of sizing agents include rosin-based sizing agents (e.g., acidic rosin-based sizing agents, neutral rosin-based sizing agents), alkyl ketene dimers, alkenyl succinic anhydride, and styrene-(meth)acrylate copolymers, with alkyl ketene dimers being preferred.

[0058] Examples of wet-strength enhancers for internal application include polyamidoamine-epichlorohydrin resin, epoxidized polyamide polyamine, dialdehyde starch, urea-formaldehyde resin, melamine-formaldehyde, polyacrylamide, methylolated polyacrylamide, and polyethyleneimine.

[0059] Examples of water-repellent agents include wax emulsions, metal soaps (alkali salts of sodium, potassium, zinc, lithium, magnesium, etc.), fatty acid chromium complex salts (myristic complex salts, chromic chloride stearate complex salts, etc.), zirconium water-repellent agents, and silicone emulsions.

[0060] In this embodiment, when the pulp molded article contains non-wood pulp, it is possible to improve oil resistance using only the pulp raw material. Therefore, sufficient oil resistance can be obtained even if the amount of wet strength enhancer and water repellent added is reduced or omitted. However, this does not preclude the addition of a wet strength enhancer or water repellent for the purpose of obtaining higher oil and water resistance.

[0061] [density] In this invention, to achieve the effects of the invention, the density of the pulp molded article is 0.45 g / cm³. 3 More than 1.0g / cm 3 The following is preferable:

[0062] Furthermore, from the viewpoint of further improving surface smoothness and oil resistance, the density of the pulp molded article is more preferably 0.50 g / cm³. 3 More preferably 0.60 g / cm³3 or more, and more preferably 0.95 g / cm 3 or less.

[0063] The density of the pulp molded body can be measured in accordance with JIS P 8118:2014. Note that JIS P 8118:2014 is a method used for paper and paperboard. In this embodiment, the sample size may not be taken as specified. In that case, the sample size is appropriately adjusted and used for measurement. The basis weight is measured in accordance with JIS P 8124:2011, and the adjustment of the sample size is the same as above. The flat surface portion of the molded body is used for measurement.

[0064] Regarding the basis weight, it is preferable to have a certain degree. As the transmittance decreases (opacity increases), the reflectance improves.

[0065] In the present invention, in order to achieve the effects of the present invention, in the pulp molded body, the basis weight is preferably 1500 kg / m 2 or less. Also, the lower limit value of the preferable basis weight is 200 kg / m 2 is.

[0066] The pulp molded body may have a multi-layer structure by performing the subsequent picking-up process a plurality of times or hot-pressing a plurality of mold intermediates in the hot-pressing process. However, from the viewpoint of excellent surface smoothness and oil resistance, it is preferably a single-layer structure.

[0067] [Thickness] The inventor has discovered that in order to achieve the effects of the present invention, the thickness of the pulp molded body is preferably 500 μm or more and 1500 μm or less.

[0068] [Fiber length] In this invention, to achieve the effects of the present invention, it is preferable that the average fiber length of the pulp molded article is 0.5 mm or more and 1.0 mm or less. By keeping the fiber length within this range, the texture and dispersibility of the pulp are improved (the amount of floc is reduced). Fiber length affects reflectance, transmittance, and absorptiveness. Shorter fibers are preferable.

[0069] [Method for manufacturing pulp molded articles] The method for manufacturing pulp molded articles is not particularly limited, but it is preferable to manufacture them by a method having the following steps 1 to 3 in this order. The pulp molded articles obtained by this method have excellent surface smoothness, are decorative, have excellent aesthetic appeal, and can be easily surface-finished. The method of decoration is not particularly limited, and may include painting with watercolors or the like.

[0070] Step 1: Pulp suspension preparation step Step 2: Forming process to obtain a mold intermediate by forming pulp from a pulp suspension through a mold. Step 3: A hot pressing step in which the mold intermediate is sandwiched between a first press die and a second press die and hot pressed.

[0071] In step 1, pulp raw materials and other components as needed are added to water to prepare a pulp suspension (pulp slurry). The concentration of the suspension (slurry concentration) is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, and preferably 7% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, from the viewpoint of surface smoothness, dimensional stability, and productivity.

[0072] Step 2 is the papermaking process, in which pulp is formed from the pulp suspension via a papermaking mold.

[0073] A molding die, such as a wire mesh mold with a vacuum-permeable structure, is immersed in a pulp suspension. The pulp suspension is drawn into the molding die to remove water, while the pulp fibers are laminated and adsorbed onto the die to form a three-dimensional wet paper. Then, the molding die is withdrawn from the pulp suspension, and the water-containing three-dimensional wet paper is dehydrated by suction or pressure.

[0074] In this process, the molding die, on which pulp has been layered and adsorbed onto its surface, is brought close to the pulp-adsorbed surface while vacuum suction is maintained. A release mold (release device) with vacuum suction is then brought close to the pulp-adsorbed surface, compressing and vacuum-suctioning the pulp mold intermediate to dewater it. After that, the vacuum pressure of the molding die is reduced to zero, and the release mold is pulled back while the pulp mold intermediate remains adsorbed onto the release mold to release it.

[0075] Step 3 is a hot pressing step in which the mold intermediate obtained after the papermaking step is heated and hot-pressed using a first press die and a second press die located in the opposite direction from the first press die.

[0076] Step 3 involves transferring the dewatered pulp mold intermediate obtained in Step 2 to a first press die for hot pressing, which is made of, for example, a porous die. The pulp mold intermediate transferred to the first press die is sandwiched between the first press die and a second press die for hot pressing, which is located in the opposite direction from the first press die and engages with the first press die. The intermediate is then heated and pressurized to obtain a predetermined pulp molded body.

[0077] Furthermore, it is preferable to incorporate an electric heater inside at least one of the first and second press dies for hot pressing, thereby heating at least one of the first and second press dies. Alternatively, the entire mold, including the first and second press dies, may be housed in a furnace into which hot air is introduced, so that hot air passes through the inside of the mold.

[0078] In step 3 (hot pressing step), the pressure applied by the first and second press dies during pressing is preferably 0.1 MPa·s or higher, more preferably 0.3 MPa or higher, even more preferably 0.4 MPa·s or higher, and even more preferably 0.6 MPa or higher, from the viewpoint of obtaining a pulp molded article with excellent surface smoothness, and preferably 3.0 MPa·s or lower, more preferably 2.0 MPa or lower, and even more preferably 1.5 MPa·s or lower, from the viewpoint of power consumption and equipment load.

[0079] In step 3 (hot pressing step), the temperature during hot pressing is preferably 130°C or higher, more preferably 150°C or higher, and even more preferably 170°C or higher, from the viewpoint of obtaining a pulp molded article with excellent surface smoothness, and preferably 280°C or lower, more preferably 250°C or lower, and even more preferably 230°C or lower, from the viewpoint of power consumption, equipment load, and discoloration suppression.

[0080] In the above process, pulp molding with excellent smoothness is performed on both sides, but in the present invention, it is also permissible to perform the process on only one side. In this pulp molding, for example, a fine mesh can be formed on the surface.

[0081] [evaluation] Table 1 shows the pulp composition (LBKP relative to NBKP) (%), CSF (mL), hot pressing process (yes / no), thickness (μm), and density (g / cm³) for each example and comparative example. 3 This represents an evaluation of surface roughness (average roughness Sa (μm)), surface roughness (maximum height difference Sz (μm)), total light reflectance (%), diffuse reflectance (%), and total light transmittance (%) at a wavelength of 555 nm.

[0082] For the evaluation of reflection and transmission (including measurement of total light reflectance, diffuse reflectance, and total light transmittance), the lampshade was attached, and the way the lampshade glowed near the light source was evaluated in a dark room.

[0083] [Table 1]

[0084] In Comparative Example 1, at a wavelength of 555 nm, the total light reflectance was 43.6%, the diffuse reflectance was 39.9%, and the total light transmittance was 0.0%.

[0085] Comparative Example 1 has a lower reflectivity compared to Examples 1 to 5, and therefore cannot sufficiently diffuse light. Furthermore, Comparative Example 1 cannot sufficiently transmit light compared to Examples 1 to 5, so it cannot be expected to be effective as a lighting fixture. Comparative Example 1 has low "total ray reflectivity" and "diffuse reflectivity," resulting in a dark and uneven brightness, making it unsuitable as a lampshade.

[0086] For example, in Example 5, the entire lampshade near the light source became moderately bright, improving the aesthetic appeal of the lampshade and enhancing the room's atmosphere. However, in Comparative Example 1, where the total light transmittance was 1.0 or less, the lampshade remained dark, showing no change in aesthetic appeal and not contributing to an improvement in the lampshade's design.

[0087] [others] The present invention is not limited to the embodiments described above or the modifications mentioned in various places, and can be modified or altered as appropriate without departing from the technical spirit of the present invention. [Explanation of Symbols]

[0088] 1 Lighting fixtures 2. Reflective material (lampshade) 3 chords 4 lamps 5 plugs

Claims

1. A pulp molded article characterized by having a total light reflectance of 50% or more at a wavelength of 555 nm.

2. The pulp molded article according to claim 1, characterized in that the diffuse reflectance at a wavelength of 555 nm is 50% or more.

3. The pulp molded article according to claim 1, characterized in that the total light transmittance at a wavelength of 555 nm is 1.0% or more.

4. Density is 0.45 g / cm³ 3 1.0g / cm or more 3 The pulp molded article according to claim 1, characterized in that it is as follows:

5. The pulp molded article according to claim 1, characterized in that its thickness is 500 μm or more and 1500 μm or less.

6. The pulp molded article according to claim 1, characterized in that the pulp blending ratio (LBKP / NBKP) of bleached hardwood kraft pulp (LBKP) to bleached softwood kraft pulp (NBKP) is 30 / 70 or more and 100 / 0 or less.

7. The pulp molded article according to any one of claims 1 to 6 is characterized in that it is a reflective member for lighting and a lampshade.

8. The lampshade according to claim 7, wherein it is possible to paint on the surface with watercolor paints or the like.

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