As amylose increases, the average particle size and crystallinity of corn starch particles gradually decrease, and the degree of polarization cross will also weaken. According to the degree of clarity and crystallinity of the polarized cross, the order is: waxy corn starch>regular corn starch>high amylose corn starch. The observation results using a scanning electron microscope show that waxy corn starch is mostly irregularly polygonal in shape; However, ordinary corn starch is similar to waxy corn starch, with most being irregularly polygonal and a few being spherical. And the particle diameter of high amylose corn starch is smaller than that of waxy corn starch and regular corn starch.

利用光學(xué)顯微鏡觀察三種不同直鏈淀粉含量玉米淀粉結(jié)構(gòu)發(fā)現(xiàn)，以顆粒大小和均勻程度而言，26% 普通玉米淀粉＞50% 高直鏈玉米淀粉＞70% 高直鏈玉米淀粉。且26% 普通玉米淀粉顆粒形貌近似圓形，而 50% 和 70% 高直鏈玉米淀粉顆粒形貌都近似橢圓形。通過(guò)掃描電子顯微鏡（SEM）觀察，也證實(shí)高直鏈玉米淀粉大多數(shù)為橢圓形，少數(shù)為不規(guī)則形狀。高衛(wèi)帥等對(duì)高直鏈玉米淀粉蠟質(zhì)玉米淀粉和普通玉米淀粉進(jìn)行粒度分布實(shí)驗(yàn)。

Observing the structure of corn starch with three different levels of amylose content using an optical microscope, it was found that in terms of particle size and uniformity, 26% ordinary corn starch>50% high amylose corn starch>70% high amylose corn starch. And the morphology of 26% ordinary corn starch particles is approximately circular, while the morphology of 50% and 70% high amylose corn starch particles are approximately elliptical. Through scanning electron microscopy (SEM) observation, it was also confirmed that most of the high amylose corn starch is elliptical in shape and a few are irregular in shape. Gao Weishuai et al. conducted particle size distribution experiments on high amylose corn starch, waxy corn starch, and ordinary corn starch.

玉米淀粉顆粒

Corn starch granules

通過(guò)分析粒度分布圖表明，普通玉米淀粉和蠟質(zhì)玉米淀粉粒度分布情況（包括：徑距比表面積表面積平均粒徑體積平均粒度等）基本相同，粒徑值與更小值差距較?。欢咧辨溣衩椎矸凵鲜鰠?shù)比另外兩種玉米淀粉大，且粒徑值與更小值差距也較大，粒徑分布相對(duì)較均勻。

By analyzing the particle size distribution diagram, it is shown that the particle size distribution of ordinary corn starch and waxy corn starch (including the average particle size, volume, particle size, etc.) is basically the same, and the difference between particle size values and smaller values is relatively small; The above parameters of high amylose corn starch are larger than the other two types of corn starch, and the difference between the particle size value and the smaller value is also significant, and the particle size distribution is relatively uniform.

無(wú)定型區(qū)和結(jié)晶區(qū)通過(guò)環(huán)狀交替形成淀粉顆粒。其主要構(gòu)成是由直鏈淀粉和支鏈淀粉組成，結(jié)晶區(qū)主要有支鏈淀粉組成，也含有少量直鏈淀粉（直鏈淀粉含量?jī)x）；大部分直鏈淀粉形成無(wú)定形區(qū)。

The amorphous and crystalline regions alternate in a circular pattern to form starch particles. Its main composition is composed of amylose and amylopectin, and the crystallization zone mainly consists of amylopectin, which also contains a small amount of amylose (amylose content meter); Most amylose forms amorphous regions.

結(jié)晶區(qū)和無(wú)定形區(qū)折射率和密度不同，從而在偏光顯微鏡下觀察淀粉顆粒時(shí)會(huì)產(chǎn)生偏光十字。不同種類(lèi)玉米淀粉偏光十字位置性狀及明顯程度都有差異，偏光十字明顯程度受淀粉顆粒大小和結(jié)晶程度影響。直鏈淀粉含量影響淀粉結(jié)晶程度，直鏈淀粉含量越高，結(jié)晶度越低。

The refractive index and density of the crystalline and amorphous regions are different, resulting in a polarized cross when observing starch particles under a polarizing microscope. There are differences in the position and degree of polarization cross of different types of corn starch, and the degree of polarization cross is influenced by the size and crystallinity of starch particles. The content of amylose affects the degree of starch crystallization, and the higher the content of amylose, the lower the degree of crystallinity.

隨著塑料餐具較多使用，消費(fèi)者的需求也不僅僅停留在簡(jiǎn)單的能用就可以了，很多消費(fèi)者對(duì)產(chǎn)品的各個(gè)方面也有了對(duì)應(yīng)的要求，塑料餐具廠家也為了迎合消費(fèi)者的需求進(jìn)行了一些列的設(shè)計(jì)和生產(chǎn)，下面就簡(jiǎn)單介紹一下要求：

With the increasing use of plastic tableware, consumers' needs are not limited to simple functionality. Many consumers also have corresponding requirements for various aspects of the product. Plastic tableware manufacturers have also carried out a series of design and production to meet the needs of consumers. Below is a brief introduction to the requirements:

耐磨性

Wear resistance

具備反復(fù)使用方便，隨著環(huán)保意識(shí)的增加塑料袋再次利用也成了很多消費(fèi)者的習(xí)慣，所以就要具備較好的耐磨性

With the increasing awareness of environmental protection, the reuse of plastic bags has become a habit for many consumers, so it is necessary to have good wear resistance

印刷圖案

Printing patterns

普通市場(chǎng)的方便袋對(duì)印刷設(shè)計(jì)沒(méi)有太多要求，但是一些包裝袋就有要求了，好看的設(shè)計(jì)圖案在視覺(jué)上給消費(fèi)者較好的吸引，也利于產(chǎn)品的銷(xiāo)售，這一方面的作用越來(lái)越大了。

The convenience bags in the ordinary market do not have many requirements for printing design, but some packaging bags do. Beautiful design patterns visually attract consumers and are also conducive to product sales, which plays an increasingly important role.

密封性

Sealing performance

不同的貨物包裝，對(duì)于密封程度也有不同的要求。然而，在正常情況下，需要密封的產(chǎn)品通常具有潮濕和發(fā)霉的特性。因此，大多數(shù)工業(yè)對(duì)包裝袋的密封性能要求一般都很高。

Different packaging of goods also have different requirements for the degree of sealing. However, under normal circumstances, products that need to be sealed usually have damp and moldy characteristics. Therefore, most industries generally have high requirements for the sealing performance of packaging bags.

實(shí)用性

Practicality

包裝袋的設(shè)計(jì)和生產(chǎn)，塑料袋生產(chǎn)商具體的方式提醒客戶使用的考慮，如環(huán)境，使用商業(yè)物業(yè)運(yùn)輸儲(chǔ)存環(huán)境。

The design and production of packaging bags, as well as the specific ways for plastic bag manufacturers to remind customers of their usage considerations, such as the environment and the use of commercial property transportation and storage environments.

保存性

Preservation

根據(jù)用戶不同的商品條件，選擇適合的材料和合理的比例，設(shè)計(jì)制作適合不同行業(yè)的塑料袋。例如，有些塑料制品害怕長(zhǎng)時(shí)間的直射陽(yáng)光，這對(duì)產(chǎn)品的保存有不好的影響。行業(yè)可以在這方面改進(jìn)和發(fā)展。

According to the different product conditions of users, choose suitable materials and reasonable proportions to design and produce plastic bags suitable for different industries. For example, some plastic products are afraid of prolonged direct sunlight, which has a negative impact on product preservation. The industry can improve and develop in this area.

玉米淀粉塑料制品具有生物可降解性良好機(jī)械性能及物理性能良好相容性良好的優(yōu)點(diǎn)。但與易得的甘蔗漿相比，玉米聚乳酸產(chǎn)量仍不高。而且玉米也是一種主糧，大量制作聚乳酸會(huì)大量消耗玉米，從而提高糧食的。

Corn starch plastic products have the advantages of good biodegradability, mechanical properties, and physical properties, as well as good compatibility. However, compared to easily available sugarcane syrup, the yield of corn polylactic acid is still not high. Moreover, corn is also a staple food, and large-scale production of polylactic acid will consume a large amount of corn, thereby increasing the price of food.

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