點(diǎn)膠機本身是控制膠水吐出量和吐出時(shí)間的裝置，因此使用點(diǎn)膠機前一定要對影響電膠質(zhì)量的膠水問(wèn)題掉，那么一般都存在哪些問(wèn)題呢？我們和雙組份打膠機廠(chǎng)家一起來(lái)看一下！
The dispensing machine itself is a device to control the amount and time of glue vomiting. So before using dispensing machine, we must solve the glue problem that affects the quality of electrocolloid. What problems do we usually have? Let's have a look with the two-component glue maker.
在點(diǎn)膠機膠水方面，膠水一定不能有氣泡，一個(gè)小小氣泡就會(huì )形成許多焊盤(pán)沒(méi)有膠水，形成空打現象，招致產(chǎn)生不合格的產(chǎn)品，所以每次中途改換膠管時(shí)必需排空銜接處，關(guān)于膠水的固化，普通消費廠(chǎng)家已給出溫度曲線(xiàn)。在實(shí)踐應盡可能采用比擬高的溫度來(lái)固化，使膠水固化后有足夠強度。
In glue dispensing machine, glue must not have bubbles, a small bubble will form a lot of pads without glue, forming the phenomenon of air beating, resulting in unqualified products, so every time when changing the rubber pipe in the middle, it must empty the joint. As for the solidification of glue, ordinary consumer manufacturers have given the temperature curve. In practice, high temperature should be used as far as possible to make the glue strong enough after curing.
膠的粘度直接影響點(diǎn)膠的質(zhì)量。粘度大，則膠點(diǎn)會(huì )變小，以拉絲；粘度小，膠點(diǎn)會(huì )變大，進(jìn)而可能滲染焊盤(pán)。點(diǎn)膠過(guò)程中，應對不同粘度的膠水，選取合理的背壓和點(diǎn)膠速度。
Viscosity of glue directly affects the quality of dispensing. If the viscosity is high, the adhesive point will become smaller, even wire drawing; if the viscosity is low, the adhesive point will become larger, and then the pad may be stained. In the process of dispensing, we should select reasonable back pressure and dispensing speed for different viscosity glue.
除去膠水和外界環(huán)境的影響，關(guān)于點(diǎn)膠機自身來(lái)說(shuō)，通常企業(yè)所用點(diǎn)膠機是采用螺旋泵供應點(diǎn)膠針頭，因而需求采取一個(gè)恒定的壓力來(lái)保證足夠膠水供應螺旋泵，假如壓力太大易形成膠溢出、膠量過(guò)多；壓力太小則會(huì )呈現點(diǎn)膠斷續現象，漏點(diǎn)，從而形成缺陷。所以應依據不同質(zhì)量的膠水、點(diǎn)膠機工作環(huán)境溫度等狀況來(lái)選擇壓力。環(huán)境溫度高則會(huì )使膠水粘度變小、活動(dòng)性變好，這時(shí)需調低背壓即可保證膠水的供應，反之亦然。
In addition to the influence of glue and external environment, as for the dispensing machine itself, usually the dispensing machine used by enterprises is to supply dispensing needles with a screw pump, so a constant pressure is needed to ensure that enough glue is supplied to the screw pump. If the pressure is too high, it is easy to form glue overflow and excessive glue content; if the pressure is too small, it will present the phenomenon of intermittent dispensing and leakage points, thus forming defects. Therefore, the pressure should be selected according to the different quality of glue and the working environment temperature of dispensing machine. High ambient temperature will reduce the viscosity and improve the activity of the glue. At this time, it is necessary to reduce the back pressure to ensure the glue supply, and vice versa.
在實(shí)踐工作中，我們以為針頭內徑大小應為點(diǎn)膠膠點(diǎn)直徑的1/2，這樣的點(diǎn)膠效果是較為理想的，因而點(diǎn)膠過(guò)程中，要應依據PCB上焊盤(pán)大小來(lái)選取點(diǎn)膠針頭，這樣既能夠保證膠點(diǎn)質(zhì)量，又能夠進(jìn)步消費。不同的點(diǎn)膠機采用不同的針頭，有些針頭有一定的止動(dòng)度。每次工作開(kāi)端應做針頭與PCB間隔的校準，即Z軸高度校準，這一點(diǎn)常常容易被疏忽。

In practice, we think that the inner diameter of the needle should be 1/2 of the diameter of the dispensing point, so the dispensing effect is ideal. Therefore, in the dispensing process, the needle should be selected according to the size of the pad on the PCB, which can not only ensure the quality of the dispensing point, but also improve the consumption efficiency. Different dispensing machines use different needles, some needles have a certain degree of motility. It is often neglected that the interval between the needle and PCB should be calibrated at the beginning of each work, i.e. Z-axis height calibration.
點(diǎn)膠量的大小依據工作經(jīng)歷，膠點(diǎn)直徑的大小應為焊盤(pán)間距的一半，貼片后膠點(diǎn)直徑應為膠點(diǎn)直徑的1.5倍。這樣就能夠保證有充足的膠水來(lái)粘結元件又防止過(guò)多膠水浸染焊盤(pán)。點(diǎn)膠量幾由螺旋泵的旋轉時(shí)間長(cháng)短來(lái)決議，實(shí)踐中應依據室溫、膠水的粘性等選擇泵的旋轉時(shí)間。
The amount of dispensing depends on the working experience. The diameter of the adhesive spot should be half of the distance between the pads. The diameter of the adhesive spot after the patch should be 1.5 times of the diameter of the adhesive spot. In this way, sufficient glue can be guaranteed to bind the components and prevent too much glue from impregnating the pad. The amount of dispensing is determined by the rotating time of the screw pump. In practice, the rotating time of the screw pump should be selected according to the room temperature and the stickiness of the glue.
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This article is written by two-component glue maker. For more products and more details, please pay attention to our official website: http://linshi.jncsjx.com! Your patronage is a great support to us.