Manufacturing method for seamless ball screen

A manufacturing method and dome screen technology, applied in projection devices, instruments, optics, etc., can solve the problems of difficulty in processing seamless dome screens, insufficient roundness of the sphere, affecting the projection effect, etc., and achieve raw material saving, good transparency, and thickness. uniform effect

Active Publication Date: 2013-05-08
WUXI XIKE NETWORK TECH
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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, many places only use some hemispheres and double balls (two hemispheres put together)
The whole ball made by this method has obvious seams, which affects the projection effect
There are also some seamless balls made by rotomolding. The seamless ball screen made by this rotomolding method is prone to defects, such as serious flow marks, bubbles, and the ball is not round enough.

Method used

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  • Manufacturing method for seamless ball screen
  • Manufacturing method for seamless ball screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] Pre-treatment: First, make a full spherical bladder. Use a clean cotton cloth to apply #8 wax evenly on all the outer surfaces of the bladder. The number of wax application is adjusted according to the size of the bladder and the effect of the application. Generally, two all over.

[0037] Prepare resin mixture: Take 1000 parts by weight of ortho-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 mix well.

[0038] The accelerator can also be cobalt naphthenate or tertiary amine, and the curing agent can also be isopropyl hydrogen peroxide, benzoyl peroxide or methyl ethyl ketone peroxide.

[0039] Add 5 parts by weight of ultraviolet absorber to delay the yellowing speed of the resin system.

[0040] The proportions of the above components can be changed according to seasonal changes or room temperature changes, and the proportions of the components can also be...

Embodiment 7

[0098] The operation method is the same as in Example 2, except that the formula of the prepared resin mixture is different, as follows:

[0099] 200 parts by weight of polyether polyol;

[0100] 300 parts by weight of polyester polyol;

[0101] 500 parts by weight of modified alicyclic isocyanate;

[0102] UV absorber 3.5 parts by weight.

Embodiment 1

[0104] Example 1: The ultraviolet absorber is 5 parts by weight. Since the ultraviolet absorber itself is a light yellow powder, if the amount added is too large, the color of the resin mixture will be affected. The added amount (5 parts by weight) can ensure that the aging rate of the dome in the early stage (within 2 years) is controlled at 3% to 5%, and the aging rate will gradually slow down in the later stage. Both the accelerator and the curing agent are 1 parts by weight, and the curing speed of the resin mixture is relatively slow at room temperature, and it is expected to cure in 20 minutes. Therefore, this formula is more effective in summer when the weather is hotter (or operating environment with higher temperature). The material of the projection ball made by this formula is relatively transparent. It has a good anti-shock ability: 4~7N·m / m2, a strong tensile strength / Mpa: 10-20, and a poor flexural strength / MPa: 3-7.

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Abstract

The invention discloses a manufacturing method for a seamless ball screen. The manufacturing method includes that needed resin mixture is prepared, the resin mixture is coated and distributed on the surface of a spherical die in a spray coating mode, coating operation is repeated after the resin mixture is totally solidified until the required coating thickness is achieved, then, a flange is sleeved on a ball opening of the spherical die after being coated, demolding process is carried out, a seamless ball is obtained, an imaging layer is coated on the surface of the seamless ball and the seamless ball screen is obtained. The manufacturing method for the seamless ball screen has the advantages that the inner surface and the outer surface of a ball body are smooth, no polishing process is needed, meanwhile, the die can be made very thin, demolding is quite easy, a resin thin film solidifies quickly, efficiency is largely improved, quality of the coated transparent ball is good, qualified rate is extremely high (more than 95%), the coated imaging layer is even, rill marks or other flaws can not occur, and aging effect of ultraviolet rays can be effectively prevented.

Description

Technical field [0001] The invention relates to a method for manufacturing an optical spherical screen lens for projection, especially a seamless spherical screen. Background technique [0002] The seamless dome screen can be applied to large-scale exhibition halls, science and technology museums, bars and other entertainment venues, as well as advertising businesses. However, it is more difficult to process seamless dome screens, and the quality is difficult to control. At present, many places only use some hemispheres and double spheres (two hemispheres together). The whole ball made by this method has obvious seams, which affects the projection effect. There are also some seamless balls made by rotomolding method. The seamless ball screen made by rotomolding method is prone to defects, such as serious flow marks, bubbles, and spheres that are not round enough. Summary of the invention [0003] In view of the above problems, the object of the present invention is to provide a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/56C08L67/06C08L63/00C08L75/04
Inventor 陈龙张文青
Owner WUXI XIKE NETWORK TECH
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