How do valve pocket manufacturers detect composite bags?

外觀視覺(jué)檢查包含對(duì)復(fù)合袋平整度、清晰度的檢查等項(xiàng)目。主要用于檢測(cè)復(fù)合袋外表有無(wú)明顯的擦傷和針孔，封口處是否污染等。

Visual appearance inspection includes the inspection of flatness and clarity of composite bags. It is mainly used to detect whether there are obvious scratches and pinholes on the surface of the composite bag, and whether the sealing part is polluted.

(1)將復(fù)合袋放置手中，對(duì)準(zhǔn)40W日光燈悄悄晃動(dòng)，經(jīng)過(guò)復(fù)合袋外表的反射光，即可清楚地發(fā)現(xiàn)復(fù)合袋外表是否有劃傷或痕跡，業(yè)界常常稱為“袋面拉絲”。如果拉絲嚴(yán)峻則應(yīng)依據(jù)實(shí)際狀況，找到毛病地點(diǎn)，將影響降低點(diǎn)，保證產(chǎn)品質(zhì)量。我們經(jīng)過(guò)調(diào)查發(fā)現(xiàn)的拉絲現(xiàn)象多半是由制袋機(jī)牽引導(dǎo)輥不潔凈形成的，因而一定要保證導(dǎo)輥潔凈。此外，導(dǎo)輥不滾動(dòng)相同會(huì)使復(fù)合袋發(fā)生拉絲毛病。導(dǎo)輥不滾動(dòng)的原因多由軸承缺油形成，因而保持良好的光滑是軸承滾動(dòng)的根本條件。

(1) Place the composite bag in your hand, aim at the 40W fluorescent lamp and shake it quietly. After the reflected light on the surface of the composite bag, you can clearly find whether there are scratches or traces on the surface of the composite bag. It is often called "bag surface wire drawing" in the industry. If the wire drawing is severe, find the fault location according to the actual situation, reduce the impact to a low point and ensure the product quality. After investigation, we found that most of the wire drawing phenomenon is formed by the unclean traction guide roller of the bag making machine, so we must ensure that the guide roller is clean. In addition, the different rolling of the guide roller will cause the wire drawing problem of the composite bag. The reason why the guide roller does not roll is mostly caused by the lack of oil in the bearing, so maintaining good smoothness is the fundamental condition for bearing rolling.

(2)復(fù)合袋平整度的檢查。具體方法是：抽取數(shù)張制品袋樣張進(jìn)行“空對(duì)地”投落，讓其自然著地（著地點(diǎn)要潔凈），調(diào)查復(fù)合袋著地后的狀況。如果復(fù)合袋著地時(shí)發(fā)作曲折，向外翹或向內(nèi)拱，則闡明復(fù)合袋的平整度差，反之則闡明平整度保持良好。形成平整度差的原因一般有以下幾點(diǎn)：制袋溫度偏高，已破壞復(fù)合袋內(nèi)層的應(yīng)力挺度；結(jié)構(gòu)組成不合理；資料自身厚薄不平等。留意，當(dāng)PET/PE和BOPP/PET/PE結(jié)構(gòu)的復(fù)合資料總厚度不超過(guò)80μm時(shí)，易發(fā)作平整度變差的現(xiàn)象。

(2) Inspection of flatness of composite bag. The specific method is: take several sample sheets of product bags for "air to ground" dropping, let them land naturally (the landing place should be clean), and investigate the condition of composite bags after landing. If the composite bag is tortuous, warped outward or arched inward when landing, it indicates that the flatness of the composite bag is poor, otherwise, it indicates that the flatness remains good. The reasons for poor flatness are generally as follows: the bag making temperature is too high, which has damaged the stress stiffness of the inner layer of the composite bag; Unreasonable structural composition; The thickness of data itself is unequal. Note that when the total thickness of composite materials of PET / PE and BOPP / PET / PE structures does not exceed 80 μ M, the phenomenon of poor flatness is easy to occur.

(3)外觀視覺(jué)檢查還包含清晰度的檢查。有些產(chǎn)品因?yàn)榇竺娣e無(wú)圖畫，清晰度顯得尤為重要。清晰度的檢測(cè)方法是：抽取一張制品袋，透過(guò)室內(nèi)直接光源調(diào)查，如果空白處有“麻點(diǎn)”、“環(huán)狀物”、“霧狀”等現(xiàn)象，則闡明清晰度差，反之標(biāo)明清晰度保持良好。

(3) Visual appearance inspection also includes clarity inspection. In some products, clarity is particularly important because there are no pictures in a large area. The detection method of sharpness is: take a piece of product bag and investigate through the indoor direct light source. If there are "pits", "rings", "fog" and other phenomena in the blank, clarify that the sharpness is poor, otherwise indicate that the sharpness remains good.

形成清晰度差的原因是各個(gè)方面的，例如：在進(jìn)行復(fù)合時(shí)，因?yàn)閺?fù)合膠液自身色澤偏黃或偏紅，轉(zhuǎn)移復(fù)合袋上會(huì)發(fā)生相應(yīng)的偏色，影響其清晰度；如果資料自身清晰度差，有“霧狀”，也將影響其清晰度，因而在資料進(jìn)倉(cāng)時(shí)應(yīng)該嚴(yán)把質(zhì)量關(guān)，做到不合格質(zhì)料不進(jìn)倉(cāng)。此外，不一樣的復(fù)合原資料清晰度也不一樣，如流延CPP的清晰度比吹塑共擠CPP的清晰度高得多。

The reasons for the poor definition are various. For example, when compounding, because the color of the composite glue is yellow or red, the corresponding color deviation will occur when transferred to the composite bag, affecting its definition; If the clarity of the data itself is poor and "foggy", it will also affect its clarity. Therefore, the quality of the data should be strictly controlled when entering the warehouse, so that the unqualified materials will not enter the warehouse. In addition, the clarity of different composite raw materials is also different. For example, the clarity of tape casting CPP is much higher than that of blow molding co extrusion CPP.

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