Sheet feed roller and method of manufacturing the same
A paper feeding and elastic layer technology, which is applied to the electrical recording process using charge graphics, equipment for electrical recording technology using charge graphics, pile separation, etc., can solve the problem of higher maintenance costs and shorter replacement cycles for paper feeding rollers and other problems, to achieve the effect of lengthening the maintenance time, improving the conveying capacity, and improving the handling capacity
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[0041] [Examples 1, 2, 2', 2" and experimental examples 1, 2 and comparative examples 1, 2]
[0042] [Preparation of elastic layer forming material (non-crosslinked thermosetting polyurethane rubber)]
[0043] 70 parts by weight of polytetramethylene ether glycol (PTMG), polypropylene glycol (PPG) [Preminol S 3005 manufactured by Asahi Glass Co., Ltd. (monool content: 0.8% by weight, Mn: 5000, number of functional groups: 3, total unsaturated Degree: 0.0048meq / g)] 30 parts by weight, after vacuum deaeration and dehydration at 80°C for one hour, an appropriate amount of polyisocyanate [toluene diisocyanate (TDI)] is mixed and reacted at 80°C for three hours under a nitrogen atmosphere , Prepared into a polyurethane prepolymer having an NCO group at the terminal (NCO content: 3.0% by weight, NCO index: 105). In addition, after the polyurethane prepolymer was vacuum degassed at 90°C for 30 minutes, 1.8 parts by weight of chain extender [1,4-butanediol (1,4-BD)] and chain extender [tr...
Example
[0052] [Examples 3 to 6]
[0053]In the adjustment of the elastic layer forming materials of the above-mentioned Examples 1, 2, 2', 2" and Experimental Examples 1, 2, the weight ratio of the mixed PTMG and PPG (PTMG / PPG), the JIS-A hardness of the formed elastic layer was changed in each example. Other than that, it was the same as the above-mentioned Example 1. This example 1 is also shown in Table 3 below.
[0054] [Existing example 1]
[0055] As an existing product, a paper feed roller with an elastic layer made of polyurethane, a creped surface formed on the outer peripheral surface, and no grooves formed as a conventional example 1 is used. The area of the mountainous part of the crepe surface (S 1 ) And the area of the valley (S 2 ) Area ratio (S 1 / S 2 ), the height of the mountain-shaped portion and the distance between the tops of the adjacent mountain-shaped portions were measured in the same manner as described above, and the results are shown in Tables 1 and 2 be...
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