Method for manufacturing seamless spherical screen by using ball bladder

A technology of seamless spherical shells and bladders, which is applied in optics, instruments, projection devices, etc., can solve the problems of difficulty in processing seamless spherical screens, affecting projection effects, and insufficient roundness of spherical shells, etc., to achieve good transparency and improve Projection effect, fast curing effect

Inactive Publication Date: 2013-09-18
佘广为
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is limited to the difficulty of processing seamless domes, and the quality is difficult to control. At present, only some hemispheres and double balls (two hemispheres put together) are used in many places.
The whole ball made by this method has obvious seams, which affects the projection effect
There are also some seamless balls made by rotational molding. The seamless ball screen made by this rotational molding method is prone to defects, such as serious flow marks, bubbles, and insufficient roundness of the spherical shell.
In addition, the rotomolding method requires the production of machinery and equipment, and the cost of equipment required for super-large dome screens (dome screens with a diameter greater than 3 meters) is particularly high, so this method cannot be used

Method used

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  • Method for manufacturing seamless spherical screen by using ball bladder
  • Method for manufacturing seamless spherical screen by using ball bladder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Pre-treatment: First, make a full-spherical bladder, which can be a hollow bladder, apply #8 wax evenly on all the outer surfaces of the bladder with a clean cotton cloth, and the number of times of waxing depends on the size of the bladder. Adjust the size and effect of smearing, generally smearing twice.

[0032] Preparation of resin mixture: take 1000 parts by weight of o-phthalic unsaturated polyester resin, first add 1 part by weight of accelerator (cobalt isooctanoate) and 1 part by weight of curing agent (cyclohexanone peroxide), and stir evenly.

[0033] The accelerator can also choose cobalt naphthenate or tertiary amine, and the curing agent can also choose isopropyl hydroperoxide, benzoyl peroxide or methyl ethyl ketone peroxide.

[0034] Add 5 parts by weight of UV absorber to slow down the yellowing speed of the resin system.

[0035] The proportions of the above components can be varied according to seasonal changes or room temperature changes, and can al...

Embodiment 2

[0042] The pretreatment method is the same as in Example 1.

[0043] Prepare epoxy resin mixture A:

[0044] 400 parts by weight of liquid bisphenol A type epoxy resin;

[0045] 250 parts by weight of liquid bisphenol F type epoxy resin;

[0046] 50 parts by weight of 1,4 butanediol diglycidyl ether;

[0047] Thoroughly stir and mix uniformly to obtain resin mixture A.

[0048] To prepare curing agent mixture B:

[0049] 100 parts by weight of m-xylylenediamine;

[0050] 20 parts by weight of triethylenetetramine;

[0051] 60 parts by weight of polyetheramine;

[0052] Thoroughly stir and mix uniformly to obtain curing agent mixture B.

[0053] Take 700 parts by weight of resin mixture A, add 300 parts by weight of curing agent mixture B, and add 20 parts by weight of defoamer, and stir evenly.

[0054] Add 5 parts by weight of ultraviolet absorber to the above system to obtain the target mixture, so as to delay the yellowing speed of the resin system.

[0055] Sprayi...

Embodiment 3

[0058] Operation method is identical with embodiment 1, and difference is that the formula of the resin mixture of preparation is different, as follows:

[0059] 1000 parts by weight of unsaturated resin;

[0060] 3 parts by weight of ultraviolet absorber;

[0061] Accelerator 2 parts by weight;

[0062] 2 parts by weight of curing agent.

[0063] Note: The amount of curing agent and accelerator added determines the curing speed of the resin. Add 2 parts by weight of curing agent and accelerator, suitable for operating environments with low temperature (below room temperature, higher than 10 degrees Celsius).

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Abstract

The invention relates to a method for manufacturing a seamless spherical screen by using a ball bladder. The method comprises the steps of: (1) manufacturing the ball bladder in the shape of an entire ball and waxing on all the outer surface of the ball bladder to form a wax layer; (2) spraying a resin mixture to the surface of the wax layer on the ball bladder to manufacture a seamless spherical shell; (3) casing a flange on the ball mouth of the seamless spherical shell and then separating the seamless spherical shell from the ball bladder; and (4) spraying an imaging layer on the surface of the seamless spherical shell to form the seamless spherical screen. The method is used for manufacturing the seamless spherical screens of various sizes.

Description

technical field [0001] The invention relates to a method for making a seamless ball screen, in particular to a method for making a seamless ball screen by using a bladder. Background technique [0002] Seamless domes can be used in large exhibition halls, science and technology museums, bars and other places, as well as advertising business. However, it is limited to the difficulty of processing seamless ball screens and the quality is difficult to control. At present, only some hemispheres and double balls (two hemispheres put together) are used in many places. The whole ball made by this method has obvious seams, which affects the projection effect. There are also some seamless balls made by rotational molding. The seamless ball screen made by this rotational molding method is prone to defects, such as serious flow marks, bubbles, and insufficient roundness of the spherical shell. In addition, the rotomolding method needs to make machinery and equipment, and the cost of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/60
Inventor 佘广为
Owner 佘广为
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