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Impact-absorbing sheet

A shock-absorbing, rubberized technology, applied in the field of image display equipment, which can solve problems such as defective appearance, low shock-absorbing performance, deformation of the casing or image display panel, etc. Effect

Inactive Publication Date: 2006-04-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the conventional shock-absorbing sheet has problems in that it deforms the housing or the image display panel due to its strong repulsive force against compression; The image display panel is cracked by an external impact, etc.
However, such a shock-absorbing sheet does not exhibit sufficient shock-absorbing performance, and particularly when a shock (low-speed deformation) is applied by pressing or the like, there is a problem in that the image display panel is caused by concavity and convexity of the casing. cracks; appearance of defects due to entry or generation of dust, etc.

Method used

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Examples

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preparation example Construction

[0064] Therefore, in the present invention, as a method of producing rubber foam, a production method using a high-pressure inert fluid as a foaming agent is preferable, and a method of forming a foam by the steps of using High-pressure inert fluid The step of reducing pressure after impregnation of a rubber-elastic polymer, such as a thermoplastic elastomer. Incidentally, when the impregnation with the inert fluid is performed, an unfoamed molded article previously molded into a sheet may be impregnated with the inert fluid, or a molten polymer may be impregnated with the inert fluid under pressure.

[0065] The above inert fluid is not particularly limited as long as it is inert to the polymer to be used and the polymer can be impregnated with the inert fluid, and examples thereof include rare gases such as helium and argon and inorganic gases such as nitrogen and carbon dioxide. gas etc. Among these, carbon dioxide has a relatively high affinity for polymer materials, has ...

Embodiment 1

[0118] (preparation of rubber foam)

[0119] At 200° C., 45 parts by weight of polypropylene (MFR: 0.35 g / 10 mm), 45 parts by weight of polyolefin elastomer (MFR: 6 g / 10 mm, JISA hardness : 79°), 10 parts by weight of magnesium hydroxide and 10 parts by weight of carbon, extruded in a strand form, cooled with water, and shaped into pellets. The pellets were fed into a short-screw extruder manufactured by JSW, and carbon dioxide gas was injected at 220° C. and 13 MPa. Carbon dioxide gas was injected at a ratio of 5% by weight to the total amount of polymer. After injecting carbon dioxide gas, the pressure was set to 12 MPa. After being fully saturated with carbon dioxide gas, the pellets were cooled to a temperature suitable for molding and extruded from a die to form a sheet with a thickness of 1.0 mm, thereby obtaining a density of 0.04 g / cm 3 and a foam with open cells having an average cell size of 60 μm.

[0120] (preparation of adhesive layer)

[0121] The following ...

Embodiment 2

[0126] A shock absorbing sheet was prepared in the same manner as in Example 1 except that the thickness of the adhesive layer was set to 0.6 mm.

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Abstract

An impact-absorbing sheet which comprises; an impact absorber including a single layer or a laminate of a rubber foam; an adhesive layer on at least one surface of the impact absorber, wherein a thickness of the adhesive layer is 0.3 mm or more.

Description

technical field [0001] The present invention relates to an impact-absorbing sheet and an image display device equipped with the sheet. Background technique [0002] Conventionally, in portable image display devices such as figure 2 As shown, an image display panel 22 is placed inside a case 21, and a transparent front panel 23 for protecting the image display panel 22 is provided on the viewing side thereof. When the transparent front panel 23 is placed, a space 20 is provided between the image display panel 22 and the transparent front panel 23, and the impact absorbing sheet 1 is placed in the space 20, thereby preventing external impact from directly acting on the image display panel 22 on, and prevents degradation of clarity due to penetration or generation of dust from the external environment or internal elements. [0003] However, the conventional shock-absorbing sheet has problems in that it deforms the housing or the image display panel due to its strong repulsive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F7/00B32B5/32B32B27/00G02F1/13H01L27/32H01J9/227
CPCB32B7/02B32B2250/22B32B2266/0207B32B2405/00B32B2457/20B32B2307/558B32B5/32B32B7/12Y10T428/28Y10T428/31645B32B25/08B32B5/18
Inventor 安积由起子杉原保则
Owner NITTO DENKO CORP
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