JPH01178445A - Composite light screening material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite light-shielding material used for shutter blades, aperture blades, and the like.

(Prior art) Conventionally, as a composite light-shielding material using continuous carbon fibers, for example, Japanese Patent Application Laid-Open No. 59-81827 is known, which describes a composite material consisting of a core part having a hollow part and a skin part. It is disclosed that at least one of these is made of a resin reinforced with continuous carbon fibers, and the other is made of a metal or plastic sheet, and that a light-shielding blade is made from this composite member. Also, Utsukai Showa 60-631
Publication No. 126 discloses a light-shielding blade in which two sheets of continuous carbon fiber reinforced with resin are used and a metal foil is sandwiched between them. Also, Jitsukai Showa 6
Japanese Patent No. 0-83825 discloses a shutter blade in which three sheets of continuous carbon fiber reinforced with a resin are used and stacked with the carbon fiber directions shifted by 90' from each other.

However, when these continuous carbon fibers are used, the matrix resin flows out due to the directionality of the carbon fibers during bonding and molding, causing fiber openings (misalignment) and deteriorating the light-shielding properties. Furthermore, there are problems such as poor adhesion (peel strength) when bonding different materials, and further improvements have been desired for blade materials for shutters and the like that operate at high speed.

(Objective of the Invention) An object of the present invention is to provide a composite light-shielding material that increases the peel strength of each layer and prevents the continuous fibers from opening, thereby improving light-shielding properties.

(Characteristics of the Invention) The present invention provides a composite light-shielding material in which a plastic film is used as a core material, and fiber sheets made of continuous fibers reinforced with a matrix resin are laminated on both sides of the core material, and these are further thermally bonded. By forming a large number of holes, the matrix resin of the fiber sheet on both sides is integrated through the chain holes and peeled off 111! (Adhesion) In addition to increasing the strength, the plastic film is matte-finished to prevent the matrix resin from flowing improperly during thermal bonding, resulting in a uniform thickness and the stress of the resin flowing through the chain holes. It is characterized by a composite light-shielding material that can prevent continuous fibers from opening.

(Example 1) FIG. 1 is a top view of a plastic film 1 as a core material of a composite light shielding material used in this example. As shown in the figure, the plastic film 1 is matted, more specifically, sandblasted to adjust the surface roughness to 5μ, and then punched with a press to form a large number of holes 1a with a diameter of 1 m/m at equal intervals. be.

FIG. 2 is a sectional view of a composite light shielding material made using the core material shown in FIG. 1.

In the figure, 2-a and 2-b are prepreg sheets made by impregnating carbon fiber bundles aligned in one direction with epoxy resin to strengthen them, and each has a thickness of 25 μm. The plastic film 1 is a biaxially stretched polyester film and has a thickness of 25 μm. To obtain this composite light shielding material, first cut the prepreg sheet 2-a into a regular length.
A plastic film 1 serving as a core material is layered on top so that the MD (longitudinal) direction of the heat shrinkage rate characteristic makes an angle of 90° with the fiber direction, and another prepreg sheet 2-b is placed on top of it so that the fiber direction is the same. Place it so that the
A composite plastic light shielding material is obtained by heating for 0 minutes. In addition, for adhesion of each member, prepreg sheet 2-a,
2-b matrix resin is used. Here, a biaxially stretched type film was used as the plastic film 1 as the core material, and the direction of lamination was limited to the unidirectional Bripreg sheet 2-a.

This is for the purpose of absorbing the anisotropy in the longitudinal and lateral directions in the thermal expansion coefficient of 2-b by utilizing the difference in thermal shrinkage rate in the MD and TD directions of the biaxially stretched film, and alleviating thermal strain during molding. . The heat shrinkage rate characteristic of the plastic film 1 used is M
D (vertical) direction 2.0-3.0%, TD (horizontal) direction 0.1
~0.3% is suitable. The composite light-shielding material obtained in this example has good flatness and high adhesion strength, and the shutter blade obtained by pressing it has a flatness of 0.1 m/m or less and a variation in material thickness of 4%. It fully satisfies the following:

The third evaluation of the characteristics of the composite light shielding material obtained in Example 1 was conducted.
Shown in Figures a, b and Figure 4 a, b. In addition, as a comparative example, a case is shown in which a polyester film having the same configuration as in Example 1 but without perforated core material is used.

As is clear from the figure, the composite light shielding plate of Example 1 is superior in both peel strength and bending rigidity. The measurement method is as follows.

Peel strength> 10 m/m x 50 m/m specimen odor,
Then, the core film is peeled off in a 180° direction, and the peel resistance is detected using a load converter, and this is taken as the peel strength. At this time, a trigger for peeling is given to the specimen. (Using surface property measuring machine TYPE-HEIDON-14) Bending rigidity> Support at both ends of 10m/m x 50m/m specimen 3Qm/
Measure the central concentrated load when applying a displacement of 4 m/m over a m span.

(Example 2) FIG. 4 is a sectional view of a composite light shielding material of Example 2. Plastic film 1 and prepreg sheet 2 as core material
-a and 2-b are the same as in Example 1 above, but further,
In order to improve light-shielding properties, sliding properties, and water resistance and to obtain a good appearance, Afl vapor deposition layers 4-a and 4-b (300 to 500A) and a plastic film 3 are further applied on the prepreg sheets 2-a and 2-b. a, 3 bs A urethane-based black ink layer (5 to 8 μm) was applied. This embodiment is particularly advantageous in the mass production of light-shielding materials because it can be continuously processed as a roll material to impart appearance characteristics necessary for a high-speed shutter blade material to the surface layer film.

The above-mentioned embodiments are characterized by the formation of a large number of holes 1a in the plastic film 1 as a core material and the improvement of properties by matte processing.

A large number of holes are formed in the plastic film as the core material, and the matrix resin of the prepreg sheets on both sides is integrated through the chain holes, thereby increasing the peel strength of each layer and improving the properties as a composite light shielding plate. This is well known, but in this example, the plastic film used as the core material is further matte-treated to prevent the continuous fibers from opening, to obtain a uniform thickness, and to have excellent light-shielding properties. A composite light shielding material can be provided. That is, due to the matte processing of the plastic film 1, the flow of the matrix resin in the planar direction during thermal bonding of the prepreg sheets 2-a and 2-b is greatly resisted. It is possible to prevent the matrix resin from flowing and making the thickness uneven. Secondly, it is possible to prevent the continuous fibers from being biased in the opening direction (direction substantially perpendicular to the fiber direction) due to the flow of the matrix resin in the direction of the large number of holes, thereby greatly improving the light-shielding property. .

Thirdly, both prepreg sheets 2-a.

The adhesion performance between 2-b and the plastic film 1 as a core material can also be improved by the matte-finished finely uneven surface in areas other than the multiple holes 1a.

In addition, in this example, prepreg sheet 2-a,
Continuous carbon fibers reinforced with matrix resin were used as 2-b, but even if glass fibers, aramid fibers, boron fibers, silicon carbide fibers, alumina fibers, etc. were used instead of carbon fibers, almost no problem Similarly, the effects of the present invention can be obtained.

In addition, specific methods for matting the plastic film 1 as a core material include sandblasting, liquid honing, dry honing, etc., and experimental results have shown that the surface roughness obtained by this method is suitable at 5μ to 10μ. It has gained.

The holes 1a in the plastic film 1 as a core material are formed by punching with a press, melting with a laser, thermal transfer melting with a concave-convex cylinder, etc., and the hole diameter is 0.5.
Experimental results have shown that a pitch of 2 to 3 m/m at equal intervals vertically and horizontally is suitable for the arrangement.

(Effects of the Invention) As explained above, the present invention provides a composite light-shielding material that achieves lightweight and high-rigidity performance by forming a large number of holes in the plastic film as a core plate and by matting the film to make it more easily peelable. Strength.

Provided is a composite light-shielding material that has increased bending rigidity, uniform thickness, and improved light-shielding properties.

[Brief explanation of the drawing]

FIG. 1 is a top view of a plastic film as a core material used in Example 1 of the present invention. FIG. 2 is a sectional view taken along the X-Y line of the composite light-shielding material as Example 1. FIGS. 3a and 4a and 4a and 4b are explanatory diagrams showing characteristic evaluation of the composite light shielding material as Example 1. FIG. 5 is a sectional view of a composite light shielding material as Example 2 of the present invention. 1-111 Plastic film as core material, la-
111 holes, 2-a, 2-b---prepreg sheet. Applicant: Canon Electronics Co., Ltd.
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Claims (1)

[Claims] (1) A base material made by laminating a sheet-like product made of continuous fibers aligned in one direction reinforced with a matrix resin on both sides of a core material made of plastic film, and then bonding them by applying heat. A composite light-shielding material characterized in that the core material is a perforated plastic film that is matted on both sides.