JP4446703B2 - screen - Google Patents

Description

  The present invention relates to a screen. Specifically, the present invention relates to an easy-to-handle screen that functions with reflected light.

As a method of presentation and advertisement, it is common practice to project an image on a screen by a projection device such as a slide projector, an overhead projector, or a liquid crystal projector (see, for example, Patent Documents 1 and 2). These projectors have recently been used for home video viewing, etc., due to their low prices, and the market is expanding.
For reflective screens used when viewing such images from the same direction as the projector, for example, a screen made of vinyl chloride (true specific gravity approximately 1.4) grounded with cotton or glass fiber and reflected white. In order to increase the brightness by increasing the reflectivity of the layer provided with the layer, to prevent the reflection of natural light by laminating the polarizing sheet layer, and to widen the viewing angle by laminating the light diffusion sheet. It was. However, these screens are usually overweight, and those using a polarizing sheet need to be installed according to the polarization direction of the projection light, so the installation position and storage method are limited, and in many cases Is fixed.

On the other hand, in order to form a large screen, a portable screen with a combination of two or more layers in which a foam film having an adsorption action is laminated on the back surface of an aluminum vapor-deposited PET film in which a polarizing film and a light diffusion film are laminated is also proposed. (See Patent Document 3). However, since these components are highly complicated in construction, the total weight tends to increase and the unit price of the product tends to increase as described above, and it is not always easy and easy to handle when assuming home use.
In addition, a screen using a foamed polyester film is also used, but because it is strong, it has a strong repulsion when it is rolled up, and it is limited to the use of thin objects because it causes problems when rolled up and stored. The texture is poor.

Japanese Patent Laid-Open No. 05-072630 JP 07-27017 A JP 09-274255 A

  The present invention provides a screen that has a clear image when projecting an image on a screen, and is easy to handle and install, from a projection device such as a slide projector, an overhead projector, or a liquid crystal projector. This is the issue.

The present inventors have found a film processed product having specific optical characteristics and physical properties as an easy-to-handle screen having a function of visually recognizing a clear image with reflected light.
That is, the present invention contains a polyolefin-based resin (true specific gravity of 0.9 to 1.0), has a total light transmittance of less than 30%, a total light reflectance of more than 70% to 100%, and a glossiness of 60. The screen has a polyolefin resin-containing film layer (A) having a density of 0.5 to 1.2 g / cm ³ and a curl value shown below of 250 mm or less .
Curl value: When the direction of large curl is the longitudinal direction, the screen is cut to A4 size (210 x 297 mm), and when the curled surface is laid flat so as to be concave, it looks as seen from the plane of the screen The length of the side in the longitudinal direction (projection length).

  The screen of the present invention has a clear image, no halation, is light in weight and easy to handle. For this reason, the screen of the present invention can exhibit an excellent function as a screen for image projection, and its industrial utility value is extremely large.

Hereinafter, the screen of the present invention will be described in detail. In addition, in this specification, "to" means the numerical value described before and behind that means a lower limit and an upper limit.
The embodiment of the screen of the present invention can take various forms depending on the place and purpose of construction and the construction method. For this reason, the present specification will be described in detail in the following form, but these can be appropriately changed without departing from the gist of the present invention.
Tapestry: A shape like a hanging curtain that can be used for image projection by being hung on a hollow or wall surface.
-Show window: A shape in which an adhesive layer or a re-peeling layer is provided on at least one side, which can be directly attached to a wall surface or glass surface and used for image projection.
・ Roll screen: It is used for image projection by hanging like a tapestry. The screen is processed into a shape that can be wound and stored. When not in use, it can be wound and stored in the upper winding tube. thing.

The polyolefin resin-containing film layer (A) constituting the screen of the present invention has a total light transmittance of less than 30%, preferably less than 25%, more preferably less than 20%, and a total light reflectance of more than 70%. 100% or less, preferably more than 75% and 100% or less, more preferably more than 80% and 100% or less.
When the total light transmittance is 30% or more or the total light reflectance is 70% or less, the image light is transmitted to the back side of the screen, and the luminance of the image on the projection surface tends to decrease, which is not preferable.
In addition, the total light transmittance and total light reflectance as used in this specification are the average of the transmittance | permeability and reflectance of each wavelength measured in the wavelength range of 400 nm-700 nm based on the method of JIS-Z-8722. Mean value.

The film layer (A) of the present invention desirably diffuses and reflects light incident on the projection surface. Therefore, the glossiness is 60% or less, preferably 50% or less.
When the glossiness exceeds 60%, the screen surface is halated like a mirror surface, and it tends to be difficult to see the image.
The glossiness referred to in the present invention was measured by the method described in JIS-P-8142.

The density of the film layer (A) of the present invention is 0.5 to 1.2 g / cm ^3, preferably 0.5~1.1g / cm ^3, more preferably 0.6~1.0g / cm ³ .
When the density is less than 0.5 g / cm ³ , the mechanical strength of the film layer (A) decreases, and wrinkles and tarmi tend to occur during processing, which is not preferable. On the other hand, if it exceeds 1.2 g / cm ³ , the basis weight and thus the overall weight tends to be excessive, which is not preferable in terms of handling.
The density referred to in the present invention was measured by the method described in JIS-P-8124.

The opacity of the film layer (A) of the present invention is preferably more than 75% and 100% or less, more preferably more than 80% and 100% or less, still more preferably more than 85% and 100% or less. It is.
When the opacity is 75% or less, the image light is transmitted to the back side of the screen, the brightness of the image on the projection surface is lowered, and the image tends to be difficult to see.
The opacity referred to in the present specification was based on the method described in JIS-P-8138, and the value measured by applying a black plate to the back of the sample was gradually reduced by the value measured by applying a white plate to the back of the sample. The numerical value is expressed as a percentage.

The thickness of the film layer (A) of the present invention is preferably 20 to 500 μm, and more preferably 30 to 350 μm.
If the thickness is less than 20 μm, the mechanical strength of the screen itself becomes weak and it becomes difficult to form a large screen, and if it is thicker than 500 μm, the weight of the screen itself becomes excessive and the handling tends to be difficult.
The thickness of the entire screen of the present invention is preferably 20 to 2000 μm, more preferably 30 to 1000 μm, and particularly preferably 50 to 800 μm for the same reason as described above.
The thickness referred to in the present invention was measured by the method described in JIS-P-8118.

The film layer (A) of the present invention may form pores in the film layer in order to impart the above optical properties. In that case, the porosity is preferably more than 20% and 75% or less, more preferably more than 25% and 75% or less.
When the porosity is 20% or less, the total light reflectance and opacity of the screen are lowered, and the image light is transmitted to the back side of the screen, the brightness of the image on the projection surface is lowered and the image tends to be difficult to see. is there. When the porosity exceeds 75%, troubles such as breakage and hole opening tend to occur during molding of the thermoplastic resin-containing film layer, and stable molding is difficult.
The porosity in the present invention refers to a numerical value obtained by cutting out a cross section of the film layer and observing with an electron microscope, and obtaining the area ratio occupied by the pores in the region, expressed as a percentage.

The film layer (A) of the present invention can be produced by blending an inorganic fine powder and / or an organic filler with a polyolefin resin to form a film.
Examples of the polyolefin resin include polyethylene resins such as low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene, polypropylene resins, polymethyl-1-pentene, and ethylene-cyclic olefin copolymers. .
Among these polyolefin resins, it is preferable to use a polypropylene resin.
As the polypropylene resin, a propylene homopolymer or a copolymer of propylene and an α-olefin such as ethylene, 1-butene, 1-hexene, 1-heptene, 4-methyl-1-pentene can be used. . The stereoregularity is not particularly limited, and isotactic or syndiotactic and those showing various degrees of stereoregularity can be used.

The copolymer may be a binary, ternary or quaternary system, and may be a random copolymer or a block copolymer.
The film layer (A) constituting the screen of the present invention contains, as an additional component, a polyamide resin such as nylon 6, nylon 6,6, nylon 6,10 or the like; polyethylene terephthalate or a copolymer thereof, polyethylene naphthalate, aliphatic Polyester resins such as polyester; polycarbonate, atactic polystyrene, syndiotactic polystyrene, polyphenylene sulfide, and the like may be blended.
These resins can be used in combination of two or more.
The polyolefin resin content in the film layer (A) is preferably 30 to 99% by weight, and more preferably 35 to 97% by weight. If the content is less than 30% by weight, troubles such as breakage and piercing tend to occur during molding, and stable molding is difficult. If it exceeds 99% by weight, the total light transmittance, total light reflectance, and opacity tend to be unbalanced.

As the inorganic fine powder, calcium carbonate, calcined clay, silica, diatomaceous earth, talc, mica, synthetic mica, sericite, kaolinite, titanium oxide, barium sulfate, alumina and the like can be used. Of these, calcium carbonate and barium sulfate are preferred.
As the organic filler, it is preferable to select a different type of resin from the thermoplastic resin that is the main component of the film layer.
For example, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polycarbonate, nylon 6, nylon 6,6, a cyclic olefin homopolymer, a copolymer of cyclic olefin and ethylene (COC), etc., and a melting point of 120 to 300 ° C. Or those having a glass transition temperature of 120 to 280 ° C.

In the film layer (A) of the present invention, one kind selected from the above inorganic fine powders or organic fillers may be used alone, or two or more kinds may be used in combination. When combining 2 or more types, you may mix and use an inorganic fine powder and an organic filler.
The content of the inorganic fine powder and / or the organic filler is preferably 1 to 70% by weight, and more preferably 3 to 65% by weight. If the content is less than 1% by weight, the total light transmittance, total light reflectance, and opacity tend to be unbalanced. When the amount is more than 70% by weight, troubles such as breakage and hole opening tend to occur at the time of forming the film layer (A), and stable molding is difficult.

  If necessary, the film layer (A) of the present invention may further contain an antioxidant, a light stabilizer, a dispersant, a lubricant and the like. As antioxidant, 0.001 to 1 wt% of sterically hindered phenol, phosphorus, amine and the like, and as light stabilizer 0 of sterically hindered amine, benzotriazole, benzophenone, etc. 0.001 to 1% by weight of the inorganic fine powder as a dispersant, a silane coupling agent, higher fatty acids such as oleic acid and stearic acid, metal soap, polyacrylic acid, polymethacrylic acid, or a salt thereof is 0.00. You may mix | blend 01 to 4 weight%.

A general method can be used as a molding method of a blend containing a polyolefin resin, an inorganic fine powder and / or an organic filler. For example, a cast molding method in which a molten resin is extruded into a film using a single-layer or multilayer T-die or I-die connected to an extruder, and this cast film is stretched longitudinally by utilizing the peripheral speed difference of the roll group. Examples thereof include a uniaxially stretched film molding method, a biaxially stretched film molding method in which the uniaxially stretched film is further stretched laterally using a tenter oven, and a simultaneous biaxially stretched film molding method using a combination of a tenter oven and a linear motor.
In the case of stretching, the stretching temperature is 2 to 60 ° C. lower than the melting point of the polyolefin resin to be used. When the resin is a propylene homopolymer (melting point 155 to 167 ° C.), 152 to 164 ° C., high density polyethylene ( When the melting point is 121 to 134 ° C, 110 to 120 ° C is preferable. The stretching speed is preferably 20 to 350 m / min.

The film layer (A) of the present invention may have a single layer structure or a multilayer structure. In the case of a multilayer structure, it may have a two-layer structure or a structure having three or more layers.
In the case of a single layer structure, the film layer (A) may be non-stretched, uniaxially stretched, or biaxially stretched. In the case of a two-layer structure, non-stretching / non-stretching, non-stretching / uniaxial stretching, non-stretching / biaxial stretching, monoaxial stretching / uniaxial stretching, monoaxial stretching / biaxial stretching, biaxial stretching / biaxial stretching Any structure is acceptable. In the case of a structure of three or more layers, the single layer structure and the two layer structure may be combined, and any combination may be used. The lamination method can be performed by a known method such as coextrusion or lamination.

On the surface of the film layer (A) of the present invention, an offset printing machine, a gravure printing machine, a flexographic printing machine, a screen printing machine, and a letter press printing are provided on at least one side as necessary, as long as the projected image is not inconvenient. A coating layer having suitability for printing by a machine, laser printer, thermal transfer printer, ink jet printer, or the like may be provided.
The screen of the present invention has a thermoplastic resin-containing film layer (B), a woven fabric or a non-woven fabric as necessary on at least one surface of the film layer (A) in order to supplement the mechanical strength in response to an increase in size. Can be provided alone or in combination.

The thermoplastic resin-containing film layer (B) used in the present invention can be produced by forming a thermoplastic resin into a film.
Examples of the thermoplastic resin include polyethylene resins such as low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene, polypropylene resins, polymethyl-1-pentene, and ethylene-cyclic olefin copolymers. Polyamide resins such as nylon 6, nylon 6,6, nylon 6,10 and the like; polyester resins such as polyethylene terephthalate and copolymers thereof, polyethylene naphthalate and aliphatic polyester; polycarbonate, atactic polystyrene, syndiotactic polystyrene, Examples include polyphenylene sulfide. These may be used in combination of two or more.
Among these, the polyolefin resin used for shaping | molding of a film layer (A) and the polyester-type resin can use preferably the film layer (B) of this invention. Furthermore, the same inorganic fine powder, organic filler, additive, and molding method as those used for the film layer (A) can be used. The configuration may be a single layer or a multilayer, may include a stretched layer, or may be unstretched in all layers.
The thickness of the film layer (B) of the present invention is preferably 10 to 1000 μm, more preferably 20 to 800 μm, and particularly preferably 30 to 500 μm.
If the thickness is less than 10 μm, the mechanical strength is insufficient and does not conform to the gist of the invention. If it is thicker than 1000 μm, the weight of the entire screen becomes excessive and handling becomes difficult.

As the woven fabric used in the present invention, one warp and weft of 40 to 150 denier, preferably 50 to 100 denier, each at a ratio of 50 to 140, preferably 60 to 100 per 2.54 cm. It is a plain woven fabric having a basis weight of 40 to 200 g / m ² woven by a plain weaving method that crosses every other, and can be used by laminating and sticking an adhesive as an adhesive layer.
As the material for warp and weft of plain woven fabric, nylon 6, nylon 6,6, polyethylene terephthalate, cotton, rayon, polyacrylonitrile, polyfluorinated ethylene, polypropylene, polyvinylidene fluoride and the like can be used.

As the nonwoven fabric used in the present invention, a fiber reinforced sheet obtained by heating and pressurizing a nonwoven fabric in which short fibers are entangled can be used, and short fibers opened by a thermoplastic resin such as polyethylene, polypropylene, polyamide, and polyester. It is manufactured by making paper using a paper machine as a paper material in which (fiber thickness 0.2 to 15 denier, fiber length 1 to 20 mm) is dispersed in water, and then heating and pressing with a roll and a press.
During the paper making, pulp-like particles may be mixed in the aqueous dispersion at a ratio of 10 to 90% by weight. Examples of the raw material for the pulp-like particles include aromatic polyamide and aromatic polyester. Moreover, you may mix | blend 5-30 weight% of thermoplastic resin powders, such as a polyvinyl alcohol fibrous binder and polyethylene, polyester, polyamide, a polypropylene, as a short fiber binder. Further, pigments, plasticizers, adhesion modifiers, dispersants and the like may be blended.
The basis weight of this nonwoven fabric sheet is preferably 12 to 80 g / m ² from the viewpoint of strength improvement, handling and cost.

  Alternatively, a nonwoven fabric sheet may be produced by spraying a thermoplastic resin powder and / or laminating a thermoplastic resin sheet on the nonwoven fabric obtained as described above, and then heating and pressurizing and integrating them. The thermoplastic resin used as the material for the powder and sheet includes polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, styrene-butadiene-acrylonitrile copolymer, polyamide, copolymerized polyamide, polycarbonate, polyacetal, and polymethyl methacrylate. Acrylate, polysulfone, polyphenylene oxide, polyester, copolyester, polyphenylene sulfide, polyetheresteramide, polyethersulfone, polyetherimide, polyamideimide, polyimide, polyurethane, polyetherester, polyetheramide and polyesteramide These may be used as a mixture of two or more.

Furthermore, the nonwoven fabric exposes a web of at least 75% by weight of randomly arranged crystalline and oriented synthetic organic polymer filaments of fiber denier to a heating fluid that is infusible to the filaments. Thus, it may be a non-woven synthetic paper in which the filaments are self-bonded at a number of crossing points arranged at spatial intervals.
Such a non-woven synthetic paper self-joins while keeping the temperature of the entire web uniform, keeping the filament shrinkage within 20%, and keeping the filament birefringence within 50%, and then shrinking the filament. The temperature can be lowered to a temperature sufficient to prevent this.
The lamination of the film layer (A), the film layer (B), the woven fabric and the nonwoven fabric constituting the screen of the present invention is a general dry lamination, wet lamination, extrusion (sand) lamination using various adhesives. Thermal lamination, EB curing type lamination, and a method of providing a pressure sensitive adhesive layer similar to the pressure sensitive adhesive layer to be described later and pressure-sensitive bonding therethrough are used.

The screen of the present invention is provided with a pressure-sensitive adhesive layer on at least one side of the film layer (A) constituting the screen, or on the layer of the film layer (B) or the woven fabric or the nonwoven fabric, if necessary. Also good.
Typical examples of the pressure-sensitive adhesive include rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives. As rubber-based adhesives, polyisobutylene rubber, butyl rubber and mixtures thereof, or tackifiers such as abietic acid rosin ester, terpene / phenol copolymer, terpene / indene copolymer, etc. were blended with these rubber-based adhesives. Things. Examples of the acrylic pressure-sensitive adhesive include those having a glass transition temperature of −20 ° C. or lower, such as 2-ethylhexyl acrylate / n-butyl acrylate copolymer, 2-ethylhexyl acrylate / ethyl acrylate / methyl methacrylate copolymer, and the like. It is done. As a form, a solvent type, an emulsion type, a hot-melt type, or the like can be used. Generally, a solvent type or an emulsion type can be laminated by coating by a known coating method.

When the screen of the present invention is provided with an adhesive layer, it can be used by being affixed to an adherend such as a wall surface, a show window or a window glass. When it is replaced, it can be easily peeled off from the adherend after use without any adhesive residue, and the screen can be used repeatedly. In addition, position adjustment at the time of sticking before use and re-sticking at the time of failure are facilitated, and the commercial advantage is further improved.
The re-peeling layer can be repeatedly applied to and peeled off from the adherend. For example, it can be formed by foaming rubber, vinyl chloride, acrylic resin, urethane resin, silicone resin, elastomer, etc. An adsorption layer capable of producing The adsorbing layer has an adsorbing action due to the foamed surface and internal micropores (recesses).

In addition to this adsorption layer, the re-peeling layer is prepared by, for example, blending the above-mentioned pressure-sensitive adhesive with a particle component that can be a surface protrusion (spacer), or by a method such as an embossing method, a screen printing method, or a gravure printing method. Examples thereof include a protrusion structure having a continuous pattern such as fine dots, lines, grids, and meshes on the surface, or a weak adhesive layer in which a paste is formed. The weak adhesive layer is a layer in which the adhesive force of the adhesive is adjusted to be low by a protruding structure (convex portion) formed on the surface or by killing.
In addition to the adsorption layer and the weak adhesive layer, the re-peeling layer can be exemplified by an electrostatic adsorption layer composed of a composition and a structure which are mainly made of a dielectric material and are easily charged and hardly attenuated. These re-peeling layers are adjusted so as not to depart from the spirit of the present invention.
The pressure-sensitive adhesive layer or the re-peeling layer may be formed before or after the film layer (A) is laminated with the film layer (B), or the woven or non-woven fabric.

It is preferable to laminate a peelable peelable material on the surface of the pressure-sensitive adhesive layer or the re-peeling layer. The peeled material is for protecting the pressure-sensitive adhesive layer or the re-peeling layer when not used, and the peeled material is peeled off before use.
In order to improve the peelability of the peeled material with the pressure-sensitive adhesive layer or the re-peeling layer, the surface that contacts the pressure-sensitive adhesive layer or the re-peeling layer is generally subjected to silicone treatment. Exfoliated materials can usually be used, and high-quality paper or kraft paper can be used as it is, or it can be treated with a silicone treatment on glassine paper, coated paper, plastic film, etc. that is calendered, resin-coated, or film laminated. Can be used.

In the screen of the present invention, a concealing layer can be provided on the non-image projection surface side of the film layer (A). The hiding layer is intended for light shielding, black solid printing, white pigment printing, metal paint printing, metal deposition, metal sputtering, foil stamping, hot stamping, coloring to the film layer (B), coloring to woven fabric, It can be provided by a technique such as coloring on the nonwoven fabric, coloring on the adhesive, coloring on the pressure-sensitive adhesive layer, or coating.
Therefore, the concealing layer may also serve as the above-described film layer, woven fabric, non-woven fabric, coat layer, adhesive layer, and pressure-sensitive adhesive layer.
The hiding layer is for further promoting the low total light transmittance, which is an essential requirement of the present invention. For example, even when a relatively thin polyolefin resin-containing film layer (A) is used, the image projection light is used. Alternatively, it is possible to effectively prevent light from being transmitted in the thickness direction due to natural light.

The screen of the present invention can be suitably used as a roll screen by imparting a curling feature. The curl value of the screen in the present invention is 250 mm or less, preferably 10 to 200 mm, more preferably 10 to 150 mm.
In the present invention, the curl value means that the screen is cut into an A4 size (210 × 297 mm) with the direction in which the curl is large as the longitudinal direction, and when the curled surface is laid flat so as to form a concave shape, the curl value is viewed from the plane direction of the screen. This is the apparent side length (projection length) in the longitudinal direction.

In the above measurement method, the curl value when there is no curl is 297 mm, the curl value when curled in a semicircular shape when viewed from the side is about 189 mm, and the curl value when cylindrical is 95 mm or less It is. The smaller the curl value, the stronger the curl state.
When the screen of the present invention is processed as a roll screen, the curl becomes compact due to this curl at the time of winding and storing work, and no excessive force is required, and the generation of wrinkles can be prevented.
When the curl value exceeds 250 mm, an excessive force is applied during the winding operation, and the screen is bent and wrinkles are generated.
The direction of curling to be applied to the screen of the present invention is not particularly limited, but from the viewpoint of protecting the image projection surface when not in use, the direction of curling is imparted so that the film layer (A) serving as the image projection surface is wound inward. It is preferable to do.

The curling of the screen of the present invention can be easily realized.
For example, the curling can be easily performed by a method of exposing for a certain period of time under a specific temperature environment (in hot water, hot water, high temperature steam) in a free state or in a state where a screen is wound around a round bar or the like. It can also be realized by winding the screen after passing it through a furnace under a specific temperature environment.
It can also be realized by passing the screen through a thermal roll set at a specific temperature, a thermal head, a head that generates a specific electromagnetic wave and thermally converts it on the screen, or the like and then winding the screen.
Furthermore, when laminating the film layer (A) and the film layer (B) constituting the screen of the present invention, the film layer (A) and the film layer (B) are laminated after adjusting and laminating the tension of each layer in the process. Can also be realized.

The specific temperature is preferably equal to or higher than the heat shrinkage start temperature of the film layer (A) and / or the film layer (B). For example, it is 60 degreeC-300 degreeC, More preferably, it is 80-280 degreeC, More preferably, it is 100-260 degreeC.
The treatment time can be variously set from 1 msec to about 7 days depending on the method used, but is preferably 3 msec to 5 days, more preferably 5 msec to 3 days.
The screen of the present invention can be formed by the film layer (A) alone, but in order to easily form and maintain the curl, the film layer (A) and the film layer (B) having different behavior such as heat shrinkage can be used. It is more effective to take a laminated structure of

The screen of the present invention may be printed on the film layer (A) or the coat layer and / or on the film layer (B) or the woven or non-woven fabric. As a method for performing printing, offset printing, gravure printing, flexographic printing, screen printing, letter press printing, laser printer, thermal transfer printer, inkjet printer, or the like can be used.
If such a film is used, it can be set as the screen which printed the information and image used as a background beforehand.

  The features of the present invention will be described more specifically with reference to examples, comparative examples, and test examples. Materials, usage amounts, ratios, processing contents, processing procedures, embodiments, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below. The raw materials used in the production examples are shown in Table 1.

[Production of polyolefin resin-containing film layer (A)]
(Production Example 1)
74% by weight of a propylene homopolymer (PP2), 10% by weight of high-density polyethylene (HDPE), and 16% by weight of calcium carbonate are melt-kneaded at 250 ° C. by an extruder and then supplied to a die set at 250 ° C. It was extruded into a shape and cooled with a cooling roll to obtain an unstretched film. This unstretched film was heated to 135 ° C. and stretched in the machine direction at a magnification of 4 times to obtain a uniaxially stretched film. This film was used as a base material layer (b).
A mixture of 52% by weight of a propylene homopolymer (PP1), 3% by weight of HDPE, and 45% by weight of calcium carbonate is melt-kneaded at 250 ° C. in a separate extruder, and then supplied to a die set at 250 ° C. to form a film. And laminated on both sides of the 4 times stretched film as a surface layer (a) and a back layer (c), and cooled to 60 ° C. to obtain a laminated film (a / b / c) having a three-layer structure.
Next, this laminated film was reheated to 150 ° C. and stretched in the transverse direction at a magnification of 9 times with a tenter. Next, after annealing at 160 ° C., cooling to 60 ° C., slitting the ears to have a thickness of 250 μm (a / b / c = 50 μm / 150 μm / 50 μm) and a multilayer stretched resin with a density of 0.80 g / cm ³ A film layer was obtained.

(Production Example 2)
A multilayer stretched resin film layer having a thickness of 80 μm (a / b / c = 17 μm / 46 μm / 17 μm) and a density of 0.77 g / cm ³ was obtained by the same method as in Production Example 1 except that the amount of resin extrusion was changed. .
On the surface layer (a) side of this multilayer stretched resin film, an ink jet coating agent having the following composition was applied such that the coating layer thickness after drying was 40 μm and dried to provide a coating layer. A film layer was obtained.
Fine particle silica (average particle size 0.3 μm) (solid content 18%) 76% by weight
Polyvinyl alcohol (solid content 10%) 20% by weight
Melamine formalin resin (solid content 30%) 2% by weight
Cationic acrylic polymer (solid content 30%) 2% by weight
Further, on the coating layer side, a “logo mark” was printed on the lower end of the screen using a large format IJ printer (trade name: MC-9000, manufactured by Seiko Epson Corporation).

(Production Example 3)
A multilayer stretched resin film layer having a thickness of 96 μm (a / b / c = 16 μm / 64 μm / 16 μm) and a density of 0.77 g / cm ³ was obtained by the same method as in Production Example 1 except that the amount of resin extrusion was changed. .
Polyurethane adhesives (trade names: BPS-2080A, BPS-2080B, Toyo Morton Co., Ltd.) so that the coating amount after drying is 3 g / m ² on the back layer (c) side of the multilayer stretched resin film layer. )) Was applied and dried, and a non-woven fabric (trade name: Spunbond #Unicel, manufactured by Teijin Ltd.) having a basis weight of 15.5 g / m ² was dry laminated and laminated and laminated to obtain a film layer.

(Production Example 4)
A multilayer stretched resin film layer was obtained by the same method as in Production Example 3, except that the polyurethane adhesive was concealed with 30 wt% titanium oxide whiskers.
(Production Example 5)
As a release material, polyethylene film is laminated on both sides of high-quality paper, and on one side of the release paper is treated with silicone, an acrylic adhesive (trade name: Olivevine BPS-1109, Toyo Ink Chemical Co., Ltd.) Manufactured) was applied to a solid content of 25 g / m ^2, and then dried to form an adhesive layer. The pressure-sensitive adhesive layer on the release paper was laminated on the back layer (c) of the film layer obtained in Production Example 1 to obtain a film layer having a pressure-sensitive adhesive layer and a peeled material.

(Production Example 6)
A multilayer stretched resin film layer having a thickness of 96 μm (a / b / c = 16 μm / 64 μm / 16 μm) and a density of 0.77 g / cm ³ was obtained by the same method as in Production Example 1 except that the amount of resin extrusion was changed. .
Polyurethane adhesives (trade names: BPS-2080A, BPS-2080B, Toyo Morton Co., Ltd.) so that the coating amount after drying is 3 g / m ² on the back layer (c) side of the multilayer stretched resin film layer. Film) obtained by coating and drying a transparent polyester film (trade name: Diafoil T600, thickness 100 μm, total light transmittance 90%, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.). A layer was obtained.
This film layer was passed between heating rolls with a surface temperature of 210 ° C. and a diameter of 30 mm at a speed of 6 m / min. The curl value of the obtained screen was 40 mm.

(Production Example 7)
The thickness is 96 μm (a / b / c = 19 μm / 58 μm / 19 μm) and the density is 0 by the same method as in Production Example 1 except that the composition of the surface layer (a) is PP2 = 100% and the extrusion amount of the resin is changed. A multilayer stretched resin film layer of .79 g / cm ³ was obtained.
(Examples 1-6)
The film layers of Production Examples 1 to 6 were used as screens as they were.
(Comparative Example 1)
The film layer of Production Example 7 was used as a screen as it was.

(Test Example 1)
About each film layer obtained by the said manufacture examples 1-7, the total light transmittance, the total light reflectance, the glossiness, the opacity, and the porosity were measured by the above-mentioned method.
For Production Example 2, only the porosity was measured with the film before the coating layer was provided, and the other items were measured with the film layer including the coating layer.
For Production Examples 3, 4, and 6, only the porosity was measured with the film before providing the nonwoven fabric or the polyester film, and the other items were measured with the film layer including the nonwoven fabric or the polyester film.
About manufacture example 5, although only the porosity is the same as that of manufacture example 1, other items included the adhesive layer and measured with the film layer except a peeled material.
The results were as shown in Table 2.

(Test Example 2)
Each screen obtained in Examples 1 to 4 and Comparative Example 1 was constructed as a tapestry of 1.8 m × 1.8 m size. Moreover, the screen which has the adhesive layer obtained in Example 5 was stuck on the glass window, and it constructed | assembled as a 1.5 m x 2.0 m size show window. Further, the curled screen obtained in Example 6 was constructed as a roll-up roll screen having a size of 0.6 m × 0.9 m.
Images were projected from the liquid crystal projector onto the film layer (A) surface side, which is the screen surface, and the clarity of the image and the presence or absence of halation were evaluated according to the following criteria.
・ Image clarity ○ Vivid
× Blurry (images are misaligned, blurred, difficult to see)
・ Halation ○ None
× Yes (difficult to see due to specular reflection)
Furthermore, the ease of handling as a screen was compared according to the following criteria.
・ Handling ○ Easy to carry and install
× Carrying and construction is difficult (1 kg or more in terms of weight)
The results were as shown in Table 3.
Moreover, in Example 6, the ease of winding of the screen provided with curl to form a roll screen during the winding operation was evaluated according to the following criteria.
○ Winding is smooth without resistance.
× There is resistance to winding, it does not round well.
The results were as shown in Table 4.

  Provide easy-to-handle screens that function with reflected light. The screen of the present invention is extremely useful as a screen for projecting images such as a projector.

Claims (17)

Polyolefin-based resin-containing film layer having a total light transmittance of less than 30%, a total light reflectance of more than 70% to 100% or less, a glossiness of 60% or less, and a density of 0.5 to 1.2 g / cm ³ A screen having (A) and having a curl value shown below of 250 mm or less.
Curl value: When the screen is cut to A4 size (210 x 297 mm) with the direction of large curl as the longitudinal direction, and the curl surface is laid flat upward so as to form a concave shape, it appears as seen from the plane direction of the screen The length of the side in the longitudinal direction (projection length).   The screen according to claim 1, wherein the opacity of the film layer (A) is more than 75% and not more than 100%.   The screen according to claim 1, wherein the film layer (A) has a thickness of 20 to 500 μm.   The screen according to any one of claims 1 to 3, wherein a porosity of the film layer (A) is more than 20% and 75% or less.   The screen according to any one of claims 1 to 4, wherein the film layer (A) has a multilayer structure.   The screen according to claim 1, wherein the film layer (A) has a multilayer structure including a layer stretched at least uniaxially.   The screen according to any one of claims 1 to 6, wherein a coating layer is provided on at least one side of the film layer (A).   The screen according to any one of claims 1 to 7, wherein a thermoplastic resin-containing film layer (B) is laminated on one side of the film layer (A).   The screen according to claim 8, wherein the thermoplastic resin constituting the film layer (B) contains a polyolefin resin or a polyester resin. The thermoplastic resin-containing film layer (B) according to any one of claims 8 and 9, or at least one surface of the polyolefin-based resin-containing film layer (A) according to any one of claims 1 to 7. the, features and be away clean that by laminating either woven or nonwoven. The thermoplastic resin-containing film layer (B) according to any one of claims 8 and 9, or at least one surface of the polyolefin-based resin-containing film layer (A) according to any one of claims 1 to 7. or claim the layer was laminated either woven or nonwoven fabric according to 10, further features and be away clean in that a pressure-sensitive adhesive layer. The thermoplastic resin-containing film layer (B) according to any one of claims 8 and 9, or at least one surface of the polyolefin-based resin-containing film layer (A) according to any one of claims 1 to 7. or textile fabric according to claim 10, the layer formed by laminating any of the non-woven fabric, further repeating pasting and peeling of possible re-release layer, wherein the to Luz clean in that a.   The screen according to claim 12, wherein the re-peeling layer is an adsorption layer, a weak adhesion layer, or an electrostatic adsorption layer.   The screen according to any one of claims 11 to 13, wherein a peelable peelable material is laminated on the surface of the pressure-sensitive adhesive layer or the re-peeling layer.   The screen according to claim 1, wherein a concealing layer is provided on the non-image projection surface side of the film layer (A). 16. At least one of the film layer (A) , a coat layer , a film layer (B), or at least one of a woven fabric or a non-woven fabric is printed. As described in the screen. The screen according to any one of claims 1 to 16 , wherein the polyolefin resin contained in the film layer (A) is a polypropylene resin.