7种异常颗粒材料的原因及其改进措施

2019-11-18返回目录

7种异常颗粒材料的原因及其改进措施.

饲料颗粒轧机，高速，效果好，特殊孔在过滤器设计中，仔细筛选，摩擦网格棒到酒吧筛分破旧的固体颗粒，在制药，化学品和食品工业广泛使用。这台机器是一代新一代的颗粒设备。有时在颗粒状生产的颗粒饲料颗粒外观是不正常的，因为缺乏经验或新生产饲料制造商，有时找不到问题的关键位于哪里。以下七种常见异常外观的颗粒材料的原因和改进措施引入了每个人，用于与参考相比的饲料生产。

1，颗粒材料弯曲和一侧呈现许多裂缝

当颗粒材料远离环时，通常发生这种现象。在生产中，当刀具位置调节从环模表面更远而刀刃钝时，颗粒从模具孔挤出切割刀触摸或撕开而不是被切断，当有一部分粒状材料弯曲时一边，另一边呈现了许多裂缝。这种颗粒状材料在冷却器冷却或运输过程中，通常来自这些裂缝在骨折上，导致生产颗粒材料，粉末太多。

Improvement measures:

a）增加进料的压缩力，即增加环形模式的压缩比，从而提高粒状材料的密度和硬度;

B) the feed particle more fine some, if you add molasses or fat should be improving molasses or fat dispersion evenness and control the adding amount, in order to improve the density of granular materials to prevent feed soft;

C) adjust the cutter from the ring mold surface distance, usually edge from the ring mold surface distance is no more than the production of feed particles diameter values, or replace the use of a sharp blade, for small diameter particles can also be the thin blade, and make a thin blade close ring die surface production;

D) using bond type granulation additives, help to improve the internal particle binding force.

2，颗粒材料的水平裂缝

Similar to the phenomenon in the case 1, the crack occurs in the transverse section of the particle, but the particle is not bent. When the fluffy pellet will contain more fiber, it is possible that this occurs. The particles are often in the feed to squeeze into the ring die pelleting holes, due to the existence of longer than the diameter of fiber, when the particles after being squeezed out, due to fiber expansion effect of the particles on the cross section of the generated across the crack, resulting in fir bark like appearance of the feed.

改善在于：

增加饲料的压缩力，即增加环的压缩比;

The maximum length of the control fiber can not exceed 1/3 of the particle size;

Reduce the output to reduce the speed of feed through the hole, increase the density;

The length of the quenching and tempering of the time, the use of multi layer conditioner or kettle type;

当粉末当水分含量太高或含尿素时，也可能导致喂食的外观含水和尿素含量控制。

3，颗粒材料产生垂直裂缝

在一些饲料配方包含蓬松和心肌梗死ldly elastic material, this material in after conditioning conditioner will water swelling, in after compress granulation, due to the role of water and raw material itself has the elastic and elastic, produced a vertical crack.

改善在于：

增加时间变化的公式,但the potential to increase the cost of raw materials; quality control of conditioning the use of steam, as far as possible the use of a saturated dry steam, so that the addition of water as far as possible to minimize the; reduce production or increase the effective length of the die hole, as far as possible the feed stranded in the mould hole; adding binder also helps to reduce the occurrence of vertical cracks.

4, the particle material from a source to generate radiation type cracks

这种外观表明，颗粒含有大颗粒的原料，如淬火和回火中的如此大的原料颗粒，难以完全吸收水分和热水蒸汽，与其他薄材料如此易于软化，而在冷却时，由于柔软程度不同，导致收缩差异，从而产生径向裂缝，粉末增加速率。

改善在于：

正确控制粉末饲料成分的尺寸和均匀性，使所有原料在淬火和回火时可以完全均匀软化。

5, the uneven surface of particles

This is used for granulating the powder containing no crushing or half broken large granule raw material, because in the quenching and tempering process failed to adequately soften, where particles are relatively hard and relatively large, through the die hole of the granulating machine cannot well and other materials combined with together, the particles is uneven. Another may be after quenching and tempering of the raw material is mixed with steam soak and steam bubble to make the feed in particles are pressed into the process of generating air bubbles, when the particles are extrusion ring die moment, due to changes in pressure lead to bubble burst and produce uneven phenomenon on the surface of the particles. Any fiber containing feed is likely to occur in such a situation.

改善在于：

Properly control the thickness of the powder feed, thus in the quenched and tempered to all raw materials can fully softened; for containing more fiber raw materials, due to the inclusion of a steam bubble, so don't in the formulation of this join too much steam.

6，晶须形颗粒材料

When in the production of granular material, if the volume of steam added too much, too much steam will accumulation in fiber or powder and particles in the extrusion die ring, because of the dramatic changes in the pressure the burst of particles and the fiber or particulate material is a convex surface, formed a shaggy whiskers, especially in production of high starch and high fiber content in feed, the use of steam more, the situation is more serious.

The improvement lies in

Good quenching and tempering. When we will be high starch and high fiber content in feed pelleting, should use low-pressure steam (0.1-0.2Mpa), in order to let the steam moisture and heat can be fully released to the absorption of feed. If the steam pressure is too high, or pressure relief valve downstream line distance conditioner is too short, the general should be more than 4.5m, the steam will not be very good release out of the water and heat, so part of the steam accumulation in feed material after quenching and tempering, when granulation leads to surface of the whisker like particle effects, in short, should pay special attention to the steam pressure regulator and relief valve installation location is correct.

7，单个颗粒或单个颗粒颜色不一致，通常称为“花”

This situation is common in the production of aquatic feed, mainly for extrusion die ring from the individual particles of color in color than the other normal particles of deep or shallow, or of a single particle surface color is consistent, thus affecting the appearance quality of the whole batch of feed.

Anyway, for feed production in the abnormal appearance of the particles discussed above the seven has the representative manifestation, and some grains in the appearance of abnormal phenomena due to the absence of representative, here not listed on. From the above discussion, it is seen that the reasons resulting in these phenomena is in many aspects, between each other is not completely isolated, which requires us to when dealing with such problems in the practical work, should add to the analysis, grasp the key to solve the problem.