改进淀粉粘合剂干燥速度探讨

采用聚乙烯醇及钠基膨润土等原料做催干剂 ,不仅能大大减少玉米淀粉粘合剂的干燥时间 ,而且不影响粘合剂的贮存     

快干型玉米淀粉粘合剂的研制

研究了快干型玉米淀粉粘合剂制备方法 ,讨论了氧化剂、碱、催干剂、交联剂和其它因素对产品性能的影响 ,得到了最佳的工艺配方为 :6份水 ,0 .0 3份氧化剂 ,0 .0 5份碱 ,0 .0 3份催干剂 ,0 .0 3份交联剂 ,1份淀粉。用该法制得的玉米粘合剂具有良好的初粘度和干燥速度 (干燥时间≤ 2 0 min)。     

快干型瓦楞纸板淀粉粘合剂的制备

本文采用独特的催干剂与增粘剂,用于制备瓦楞纸板用淀粉粘合剂,可有效地提高粘合剂的初粘性及干燥速度。     

快干型玉米淀粉粘合剂的研制

研究了快干型玉米淀粉粘合剂制备方法，讨论卫氧化剂、碱、催干剂、、交联剂和其它因素对产品性能的影响，得到了最佳的工艺配方为：６份水，０．０３份氧化剂，０．０５份碱，０．０３份催干剂，０．０３份交联剂，１份淀粉用该法制得的玉米粘合剂具有良好的初粘度和干燥速度（干燥时间≤２０ｍｉｎ）。     

高强度快干变性淀粉粘合剂的研制

本文用过氧化氢作氧化剂，将玉米淀粉氧化、糊化、交联；并采用独特的催化剂与催干剂，用于制备瓦楞纸板用氧化淀粉粘合剂，可有效地提高粘合剂的初粘性及干燥速度     

罗门哈斯开发Aquaset丙烯酸粘合剂新产品

罗门哈斯推出的Aquaset是一种无甲醛的热固性粘合剂创新产品。这种丙烯酸粘合剂产品是对现有热固性粘合剂进行完全重新设计的新产品。该粘合剂系由多元醇和次磷酸盐催干剂相配合构成，从而产生一种硬聚酯和水，它用来代替甲醛基粘合剂。甲醛基粘合剂目前有健康和环境问题，需要有完善的产品代替它。Aquaset可用于玻璃纤维绝缘材料、玻璃纤维板、汽车内部装饰件和碎料压制板等的粘结。     

快干型氧化淀粉胶粘剂的研制

用玉米淀粉为原料氧化制备淀粉磷酸酯,配以催化剂、催干剂、防腐剂,研制出用于瓦楞纸板的氧化淀粉粘合剂。有效地提高了干燥速度,解决了淀粉胶稳定性差、贮存期短的问题。     

快干型改性淀粉粘合剂的研制

以高锰酸钾为氧化剂，将木薯淀粉氧化，进而将其糊化、络合，加入催干剂，分散剂等，制成了可用于粘接瓦楞纸板的粘合剂。介绍了研制概况、工艺流程和配方，并对氧化剂等几种因素的影响作了讨论。     

木薯淀粉粘合剂的研制

采用过氧化氢作为氧化剂,将木薯淀粉氧化、糊化、络合,并加以催化剂、催干剂、防腐剂等,制得一种用于粘接瓦楞纸板,平面纸的粘合剂。介绍了研制概况、反应机理、工艺流程和配方等,并对氧化剂,糊化剂等影响作了简单讨论.     

快干型改性淀粉粘合剂的研制

以高锰酸钾为氧化剂，将木薯淀粉氧化，进而将其糊化、络合，加入催干剂，分散剂等，制成了可用于粘接瓦楞纸板的粘合剂。介绍了研制概况、工艺流程和配方，并对氧化剂等几种因素的影响作了讨论。     

环保型脲醛胶的制备与性能研究

利用自制的甲醛捕捉剂和酸性固化剂对脲醛树脂胶粘剂进行改性,并通过喷雾干燥工艺研制出环保型脲醛粉状树脂胶粘剂。还研究了不同物质的量比、缩聚阶段多次加料不同物质的量比、反应温度、甲醛捕捉剂等实验条件对脲醛树脂胶粘剂性能的影响。制备的脲醛树脂胶粘剂性能经测试达到了国家标准。     

用小麦全粉制备瓦楞纸胶粘剂研究

介绍了用发酵法将小麦全粉降解，再用化学法糊化，并辅以独特的催干剂后再交联。此工艺制备的胶粘剂成本低、流动性好、粘度稳定、干燥快。     

Diethyl ketone‐based imine as efficient latent hardener for epoxy resin

Several imines were synthesized and evaluated as water‐initiated hardener for epoxy resin. Imines with a lower electron density on the C=N carbon showed a faster hydrolysis rate. Diethyl ketone‐based imines were the most efficiently hydrolyzed among the imines examined, and the adhesive properties of epoxy resin with diimines used as the hardeners were evaluated. A novel diethyl ketone‐based diimine, N,N′‐di(1‐ethylpropylidene)‐m‐xylylenediamine (10), served as an efficient latent hardener of epoxy resin. Epikote 828 containing 10, filler, and dryer increased the adhesive strength faster than Epikote 828 containing filler and dryer with methyl isobutyl ketone‐based imine. The mixed system of epoxy resin and 10 showed good storage stability at room temperature. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1744–1749, 2002     

Study of hybrid dryer prototype and its application in pregerminated rough rice drying

In this study, a hybrid dyer, combining heat pump drying (HPD) with fluidized bed drying (FBD) concepts were designed and fabricated. The pregerminated rough rice (pre-GRR) was dried in multistage using this hybrid dryer to compare with the single-stage drying by hot air dryer. The objectives were to test the application of this hybrid dryer and determine the suitable drying condition for pre-GRR. The result indicated that the punched plate distributor was the most suitable distributor. The pre-GRR should be dried by the three-stage drying method using either FBD or HPD at 45°C in the last stage to obtain higher head rice yield, lower fissure grain, and better color values than their counterparts. The scanning electron micrographs proved that starch gelatinization occurred when applying FBD at temperatures between 100 and 140°C causing the adhesive connections inside the kernels and subsequent decrease in fissures.     

Characterization of Tomato Pulp Stickiness during Spray Drying using a Contact Probe Method

A contact probe test was developed to characterize the surface stickiness of a tomato pulp droplet at various moisture contents and temperatures. To provide tomato pulp samples with different moisture contents, tomato powder produced by a laboratory spray dryer was wetted to seven different moisture levels. The instantaneous tensile force curve was recorded during the probe withdrawal from which the maximum tensile force and other useful information were obtained and cross-examined against images of bonding, debonding, and failure of the material. Generally, at higher moisture contents tomato pulp exhibited cohesive failure followed by semi-adhesive failure, but when moisture content decreased to a certain level, a peak tensile pressure was observed and the failure was adhesive. In addition, higher temperatures shifted the points of adhesive failure toward lower moisture content.     

Characterization of Tomato Pulp Stickiness during Spray Drying using a Contact Probe Method

A contact probe test was developed to characterize the surface stickiness of a tomato pulp droplet at various moisture contents and temperatures. To provide tomato pulp samples with different moisture contents, tomato powder produced by a laboratory spray dryer was wetted to seven different moisture levels. The instantaneous tensile force curve was recorded during the probe withdrawal from which the maximum tensile force and other useful information were obtained and cross-examined against images of bonding, debonding, and failure of the material. Generally, at higher moisture contents tomato pulp exhibited cohesive failure followed by semi-adhesive failure, but when moisture content decreased to a certain level, a peak tensile pressure was observed and the failure was adhesive. In addition, higher temperatures shifted the points of adhesive failure toward lower moisture content.     

COMPARISON OF TIMBER DRYING USING SOLAR ENERGY,ELECTRICAL HEATING AND DEHUMIDIFIER.

ABSTRACT

The performance of three different types of dryers for the hot air drying of sawn-limber planks are compared. These were the electric resistance dryer, solar dryer, and the dehumidifier dryer. Whilst the electric and solar dryers depended only upon hot air for drying, the dehumidifier dryer relied on hot dehumidified air. The results of investigations carried out on timber drying employing these three types of dryers in the Engineering Faculty are compiled and compared here in this paper. The results showed that the electric dryer produced the fastest drying lime and lowest moisture content, followed by dehumidifier drying. The solar dryer achieved a lower moisture content and a faster drying rate compared to natural drying, although the difference in drying times was marginal.     

THE DEPENDENCE OF PAPER MACHINE DRYING DRYING CHARACTERISTIC ON THE MACHINE GEOMETRY

The effect of the dryer cylinder diameter on the dryer specific evaporation rate is examined theoretically. It is observed that, in the range of cylinder diameters applicable in practice, the dryer specific evaporation rate is nearly independent of the selected cylinder diameter when the dryer geometry remains unchanged. In practice, however, the dryer geometries have changed slightly according to the cylinder diameter.

TO clarify the effects of the various component factors pertaining to the dryer geometry, this paper presents a drying characteristic, i.e.. a curve showing the dependence of the drying rate on the condensing steam temperature. The drying characteristic is given in the form of a nomogram to facilitate the evaluation of the effect of the ratio between the free draw length and the cylinder diameter, and the wrapping angle, to the dryer specific evaporation rate. Further, by means of an example, the specific evaporation rates obtainable for machine geometries currently used by various machine manufacturers are compared.     

SIMULATION MODEL FOR INDUSTRIAL DRYERS: REDUCTION OF DRYING TIMES OF CERAMICS & SAVING ENERGY

ABSTRACT

A procedure was outlined to optimize industrial dryers for ceramics. The procedure consists of drying experiments on full-size products in a lab dryer, measurements of characteristics of the dryer and by simulations with DrySini. DrySim is a flexible simulation program in which a user can model his own dryer with predefined components. Two examples are given, the optimization of a chamber dryer and the optimization of a tunnel dryer. In both examples the production of the existing dryers could be increased and at the same time cost of energy could reduced by optimal use of waste air of kilns and minimizing mixing of kiln air with ambient air.