JPH0491905A - Template made of synthetic resin - Google Patents

Abstract

PURPOSE:To obtain a board made of a synthetic resin having a sufficient glare shield effect and high energy efficiency by forming conical projections or indentations having height or depth at specific values to the surface of the synthetic resin board at pitches at a specific value and forming fine irregular shapes having center-line mean roughness at a specific value. CONSTITUTION:Conical projections or indentations having height or depth of 1-10mm and the diameters of bases or the length of diagonals of 30mm or less are formed to at least one surface of a synthetic resin board at pitches of 3-30mm, and fine irregular shapes having center-line mean roughness of 2.5mum or more and the number of recessed sections of 0.5mum or more at the rate of five per 1mm length are formed to at least one surface. Since the template made of a synthetic resin has high ray transmittance and an excellent glare shield effect, the template is extremely available on health because the overall image and partial image of a light source are not viewed directly by the naked eyes and soft feeling is given to the eyes when the template is used as the cover of a luminaire.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a template made of synthetic resin used for covers of lighting equipment.

[Prior Art] Transparent synthetic resins such as methacrylic resin and polystyrene resin are molded into plate shapes and are widely used for covers of lighting equipment. The following two points are very important functional characteristics of this lighting equipment cover.

l) The total light transmission chamber is high and energy efficient.

2) The light source does not enter the field of view directly through the cover.
．． There is a soft lighting effect, and the protection of [,1 is 81°] excellent! It has an anti-glare effect.

Conventionally, as a method of imparting the above-mentioned characteristics, for example, a template in which pyramid-shaped projections or depressions are continuously provided on the surface of a resin plate is known.

[Problem to be solved by the invention] However, when looking at a cylindrical fluorescent lamp, which is the most commonly used light source for lighting equipment, through the template, although the entire image of the light source cannot be seen, the template Each portion of the protrusions or depressions on the surface is divided into a bright portion and a dark portion, and a partial image of the light source is visible in the bright portion, which is dazzling to the naked eye and cannot be said to have a sufficient anti-glare effect.

Also, synthetic resin matte boards with mechanically finely textured surfaces are known, but when looking at the fluorescent lamps listed in - through this matte board, the entire image of the light source can be seen through the matte board. It ends up. Therefore, it is necessary to block the light by adding, for example, barium sulfate, but in this case there is a problem that the total light transmittance decreases and the energy efficiency deteriorates.

An object of the present invention is to provide a synthetic resin plate that solves these problems, that is, has a sufficient anti-glare effect and is highly energy efficient.

[Means and effects for solving the problem] Structure of the present invention"
− The characteristic point is that on at least one surface of the synthetic resin plate,
3 to 30 cone-shaped protrusions or depressions with a height or depth of 1 to 10 mm and a bottom diameter or diagonal length of 30 mm or more
In addition to this, at least one surface has fine irregularities with a center line average roughness of 2.5 μm or more and the number of recesses of 0.5 μm or more per 1 mm length. The purpose is to use a shaped synthetic resin template.

That is, the synthetic resin mold plate of the present invention has a mold surface with specific conical projections or depressions (hereinafter referred to as "mold surface") and a specific fine concave II+1 shape, and has a shape of pine [. face (hereinafter)
(hereinafter referred to as "1 matte state"), each of these may have at least one of the surfaces k,', and one surface may have a double-edged finish (hereinafter referred to as "both"). A surface that has been processed is called a "matte mold surface," a surface that has not undergone any processing is called a "smooth plane surface," and a surface that has only one of the treatments is called a "smooth mold surface." ”, referred to as “matte plane”).

The present invention will be explained in detail below.

The type of synthetic resin used for the synthetic resin template of the present invention is not particularly limited, but since the main purpose is to cover lighting equipment, transparent synthetic resins such as methacrylic resin, polystyrene resin, polycarbonate resin, and vinyl chloride resin may be used. be. In the present invention, trace amounts of ultraviolet absorbers, optical brighteners, heat stabilizers, colorants, etc. may be added to these resins.

In the present invention, the protrusion or depression on the mold surface has a conical shape, and the height (in the case of a protrusion) or depth (in the case of a depression) of the conical shape is 1 to 10 mm. The shape of the pyramid is, for example, a triangular pyramid, a square pyramid, or a cone. In the case of a pyramid, the length of the diagonal of the base is 30 nm or less, and in the case of a cone, the length of the diameter is 30 nm or less. Here, if the base is triangular, it is defined by the length of one side, and if it is placed horizontally, it is defined by the length of its major axis. In the present invention, the cone-shaped projections or depressions are preferably arranged in regular rows, and depending on the shape, the projections or depressions are arranged alternately in continuous rows or columns,
Preferably, no flat portion is formed on the mold surface. Particularly preferred is a mold surface in which triangular pyramids, quadrangular pyramids, and hexagonal pyramids are successively formed without forming any flat surface. The pitch of these protrusions or depressions is 3 to 30 mm, and the pitch is defined as the distance between the conical tops of the shortest distance between the protrusions or depressions.

Next, in the present invention, the fine unevenness shape of the matte surface is
The center line average roughness is 2.5 μm or more, and 0.5
The number of recesses larger than μm is 1. Five or more pieces are required per mn1 length.

In the present invention, the centerline average roughness and the number of four parts of 0.5 μm or more are defined by the following measuring force method.

■ Center line 317 average roughness The center line average roughness specified in JIS B-0601 is measured using a stylus type surface roughness measuring device conforming to JIS B-0651.

■ Number of recesses of 0.5 μm or more Using a stylus-type surface roughness measuring device based on JIS B-0601, set a count level 0.5 μm below the center line of the roughness curve, and measure this count level and the roughness curve. Each two points where the two intersect is counted as one recess, and the number of recesses is calculated between the reference lengths and converted to the number per Irnm length.

When the synthetic resin mold plate of the present invention is used as a cover for a lighting equipment, the projections or depressions on the mold surface prevent the entire image of the fluorescent light source from being seen, and the minute irregularities on the matte surface prevent the light from the light source from being seen. When the light enters or exits the template, it is scattered and a partial image of the light source becomes invisible, providing an excellent anti-glare effect that does not cause any glare to the naked eye. In the present invention,
The height or depth of the protrusion or depression is less than 1 mm or 10 m
m, or the pitch is less than 3 nm or (
If it exceeds 30 tnrn, or if the diameter of the bottom surface or the length of the diagonal edge exceeds 30 mm, the entire image of the fluorescent light source will be visible. In addition, the center line average roughness of the surface roughness of the matte surface is less than 2.5 μm, or the number of recesses with a surface roughness of 0.5 μm or more is 1. When the number of particles is less than 5 per mm length, light scattering is small and a partial image of the light source is visible and dazzling to the naked eye, resulting in insufficient anti-glare effect.

Specific examples of the synthetic resin template of the present invention are shown in Figures 1(a) to (e).
). In the present invention, the mold surface and the matte surface each need to be applied to at least one of the surfaces. When matte surfaces are formed on both sides (C), when mold surfaces are formed on both sides and matte surfaces are formed on one side (d), when both mold surfaces and matte surfaces are formed on both surfaces ( There are five types of templates (e), each of which can be selected depending on the manufacturing process, type of resin, and degree of anti-glare effect.

In the present invention, the thickness of the template is not particularly limited, but covers for lighting equipment are usually about 1 to 1 Omm, so the thickness of the synthetic resin template of the present invention is at most 30 mm at the thickest part of the template. The preferred range is 1 mm or more at the thinnest part. If it is too thick, the weight will increase, which will put a burden on the lighting equipment and increase the cost of the resin, but if it is too thin, it may lack strength.

The method for manufacturing the synthetic resin mold plate of the present invention is not particularly limited, but includes, for example, the extrusion molding method shown in FIG. In Figure 2, the rolls No. 25 to 25'', No. 1 to No. 3, are the smooth roll (f) and mold roll (g
), using pine rolls (h), the resin extruded from the gooey is brought into close contact with these rolls, and then cooled and solidified to transfer protrusions on one side of the resin plate and fine irregularities on the other side, as shown in Figure 1. The template shown in (a) can be formed. If the shape of the roll surface used is changed, the results shown in Figures 1(b) to (
e) and templates having different shapes of mold surfaces and matte surfaces can be manufactured.

In addition, when manufacturing templates using three rolls in extrusion molding, for example, amorphous additives such as talc RAF9 body, white carbon IT powder, glass powder, etc. are added to methacrylic resin, and a Henschel mixer etc. There is also a method of making the surface of the resin plate matte by using as a raw material a material mixed in a mixer.

[Example] Example 1 Using a methacrylic resin (Asahi Kasei Kogyo ■: Delvet 70H) as a raw material, the molten resin was extruded into a plate shape using a 90φ bent type single screw extruder and a T-shaped die with a width of 1000rnrn, as shown in Fig. 2. As shown, a template with a thickness of 3 rnrn was molded using a 3-wood roll.

The rolls used were roll No. 1, smooth roll, and No. 2.
It has a continuous square pyramid-shaped recess with a pitch of 4 mm and a depth of 2 m and a square base of 4 mm square,
A matte type roll capable of providing a matte surface with a center line average roughness of 5 μm and a number of recesses of 0.5 μm or more per Imyn length of 7 m was used.
Using a matte roll with the same matte surface as in No. 2, a mold plate having a matte mold surface on one side and a matte flat surface on the opposite side was molded.

The total light transmittance of this template was measured using an integrating sphere type light transmittance measuring device according to JIS K-7105. In addition, regarding the appearance of the image of the light source (anti-glare effect), the minute unevenness shape and the number of concave portions on the matte surface were measured by the naked eye using the method and apparatus shown in Figure 3. Measured using a meter. The results are shown in Table 1.

Example 2 In Example 1, the pitch of No. 2 roll is 4rr.
zn, the bottom surface is a 4 nm square square, it has a continuous pyramidal depression with a depth of 2 rom, and the center line average roughness of the surface roughness is 5 μm and the number of recesses of 0.5 μm or more is 1 mr.
A lip plate was molded and measured in the same manner as in Example 1, except that a matte mold roll was used that provided 14 matte surfaces per n length. The results are shown in Table 1.

Example 3 In Example 1, the pitch of No. 2 roll was 25 m.
m, the bottom surface is a square with a square angle of 25rnrn, it has a continuous pyramid-shaped recess with a depth of 8mm, and the center line average roughness of the surface roughness is 5μm, and the number of recesses of 0.5μm or more is 1mr
A template was molded and measured in the same manner as in Example 1, except that a matte mold roll capable of providing 7 matte surfaces per n length was used. The results are shown in Table 1.

Example 4 A template was molded and measured in the same manner as in Example 1, except that rolls No. 3 and 3 were replaced with smooth rolls. The results are shown in Table 1.

Example 5 In Example 1, the pitch of the roll of N013 was 4 mm.
The base is a square with 4rrhrrrh angle and the depth is 4+nr.
A template was molded and measured in the same manner as in Example 1, except that the mold roll was changed to a mold roll having continuous square pyramid-shaped depressions. The results are shown in Table 1.-4゜Example 6 In Example 1, rolls No. 3 and 3 were N.

Similarly to 2, square female-shaped depressions with a depth of 2 mm with a pitch of 4 mrn and a square bottom surface of 4 mm square are continuously formed, and the center line average roughness of the surface roughness is 5 μm and O, 5 μm. A template was molded and measured in the same manner as in Example 1, except that a matte surface in which the number of the above four parts was 7 per 1 mm length was provided and a vine matte roll was used.

The results are shown in Table 1.

Example 7 In Example 1, the pitch of the NO32 roll was 4 mr.
A pear roll with a pitch of 4mm and a square base with a 4mm square depth 4, which has a square pyramid shape with a depth of 2mm and a pitch of 4 mm.
Continuously has quadrangular pyramid-shaped depressions of mm, and the center line average roughness of the surface roughness is 5 μm and the number of four parts of 0.5 μm or more is i
A template was molded and measured in the same manner as in Example 1, except that a matte surface of 7 pieces per nm length was provided and a vine matte mold roll was used. The results are shown in Table 1.

Example 8 Methacrylic resin (Asahi Kasei Kogyo ■/Delbet 70) ()
White carbon fine powder [hydrated amorphous perilla (S i O) per 100 IIffi parts.

Using a Henschel mixer to mix 2 parts of 2 parts of nizo)] as a raw material, roll No. 2 was rolled to a depth of 4rn with a pitch of 4 mm and a square bottom of 4 mm square.
A mold roll having continuous square pyramid-shaped depressions of m
A template was molded and measured in the same manner as in Example 1, except that the rolls of 3 and 3 were replaced with smooth rolls. The result is the first
Shown in the table.

Example 9 Polystyrene resin (Asahi Kasei Kogyo Nistyron 666)
A template was molded and measurements were performed in the same manner as in Example 1, except that the material was used as the raw material. The results are shown in Table 1.

Example 10 Polystyrene resin (Asahi Kasei) Igyo a@, Star Iron 6
66) The raw material was a mixture of 100 ffiffi parts and 2 III ffiffi parts of white carbon fine powder [hydrated amorphous silica (SiOzyxHzo)] using a Henschel mixer, and No. 2 rolls were made with a pitch of 4 mm and a bottom surface of 4 mm square. A template was molded in the same manner as in Example I, except that roll No. 3 was changed to a smooth roll on a mold roll having continuous pyramidal depressions with a depth of 2rnrn, and measurements were taken. went. The results are shown in Table 1.

Comparative Example 1 In Example 1, the roll of No. 12 was rolled by Bitge at 4 mr.
ri and the base is a square with 4 rrnrn angles, depth 2rn
Mold roll with continuous square pyramid-shaped depressions of rn, N0
A template was molded and measured in the same manner as in Example 1, except that No. 13 was replaced with a smooth roll. The results are shown in Table 1.

Comparative Example 2 In Example 1, except that the rolls No. 2 and No. 3 were changed to mold rolls having a pitch of 4rnrr+ and a continuous square pyramid-shaped recess with a depth of 2 rrim and a 4 mm square bottom surface. A template was molded in the same manner as in Example 1,
Measurements were taken. The results are shown in Table 1.

Comparative Example 3 In Example 1, the pitch of roll No. 2 was 4rn.
rn, the bottom surface is a 4 mm square square, it has a continuation of 2 mm deep quadrangular pyramid-shaped depressions, and the center line average roughness of the surface roughness is 5 μm, and the number of recesses is 0.5 μm or more. 1m
A template was molded and measured in the same manner as in Example 1, except that a matte mold roll capable of providing 4 matte surfaces per rn length was used. The results are shown in Table 1.

Comparative Example 4 In Example 1, roll No. 2 was flattened? 1 Roll, No. 3, with a pitch of 40 mm, 1 continuous square pyramid-shaped depression with a depth of 2 mm, and a 40 mm square bottom surface, and a center line average roughness of 5 μm. 0 at
．． A template was molded and measured in the same manner as in Example 1, except that a matte surface having 7 recesses of 5 μm or more per lrrim length was provided and a vine matte roll was used. The results are shown in Table 1.

Comparative example 5 Methacrylic resin (Asahi Kasei Kogyo @: Delvet 70H) 1
A template was molded and measured in the same manner as in Comparative Example 1, except that 3 parts by weight of barium sulfate was mixed with 00 parts by weight using a Henschel mixer as the raw material. The results are shown in Table 1.

(The following is a blank space) [Effects of the Invention] As explained above, the synthetic resin template of the present invention has a high light transmittance and an excellent anti-glare effect. The whole image and partial images are not directly visible to the naked eye, and it gives a soft feeling to the eyes, so it is very useful for health.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a synthetic resin template of the present invention, Fig. 2 is a diagram schematically showing an example of manufacturing the synthetic resin template of the present invention, and Fig. 3 is a diagram showing the rolls used in the production. FIG. 4 is a diagram showing a method and apparatus for measuring the appearance of an image of a light source in an embodiment of the present invention. 1: Matte surface 2: Smooth mold surface 3/Smooth surface 4: Matte mold surface 21: Original needle 22
: Extruder 23: T-type die 24: Plate-shaped molten resin 25.25', 25": Roll 26/take-up roll 27: Template/sample box Applicant's representative 42, light source 44...Macroscopic Asahi Kasei Yu IvS stock Company Yutaka 1) Keisuke Zanami Be

Claims (1)

[Claims] (1) At least one surface has a height or depth of 1 to 1
0mm, has cone-shaped projections or depressions with a bottom diameter or diagonal length of 30mm or less at a pitch of 3 to 30mm, and at least one surface has a centerline average roughness of 2.5μ
A mold plate made of synthetic resin, characterized in that the number of concavities of not less than m and more than 0.5 μm is 5 or more per 1 mm of length.