點膠機本身是控制膠水吐出量和吐出時間的裝置，因此使用點膠機前一定要對影響電膠質(zhì)量的膠水問題解決掉，那么一般都存在哪些問題呢？我們和雙組份打膠機廠家一起來看一下！
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.
在點膠機膠水方面，膠水一定不能有氣泡，一個小小氣泡就會形成許多焊盤沒有膠水，形成空打現(xiàn)象，招致產(chǎn)生不合格的產(chǎn)品，所以每次中途改換膠管時必需排空銜接處，關(guān)于膠水的固化，普通消費廠家已給出溫度曲線。在實踐應(yīng)盡可能采用比擬高的溫度來固化，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膠的質(zhì)量。粘度大，則膠點會變小，以至拉絲；粘度小，膠點會變大，進而可能滲染焊盤。點膠過程中，應(yīng)對不同粘度的膠水，選取合理的背壓和點膠速度。
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)于點膠機自身來說，通常企業(yè)所用點膠機是采用螺旋泵供應(yīng)點膠針頭，因而需求采取一個恒定的壓力來保證足夠膠水供應(yīng)螺旋泵，假如壓力太大易形成膠溢出、膠量過多；壓力太小則會呈現(xiàn)點膠斷續(xù)現(xiàn)象，漏點，從而形成缺陷。所以應(yīng)依據(jù)不同質(zhì)量的膠水、點膠機工作環(huán)境溫度等狀況來選擇壓力。環(huán)境溫度高則會使膠水粘度變小、活動性變好，這時需調(diào)低背壓即可保證膠水的供應(yīng)，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.
在實踐工作中，我們以為針頭內(nèi)徑大小應(yīng)為點膠膠點直徑的1/2，這樣的點膠效果是較為理想的，因而點膠過程中，要應(yīng)依據(jù)PCB上焊盤大小來選取點膠針頭，這樣既能夠保證膠點質(zhì)量，又能夠進步消費。不同的點膠機采用不同的針頭，有些針頭有一定的止動度。每次工作開端應(yīng)做針頭與PCB間隔的校準(zhǔn)，即Z軸高度校準(zhǔn)，這一點常常容易被疏忽。

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.
點膠量的大小依據(jù)工作經(jīng)歷，膠點直徑的大小應(yīng)為焊盤間距的一半，貼片后膠點直徑應(yīng)為膠點直徑的1.5倍。這樣就能夠保證有充足的膠水來粘結(jié)元件又防止過多膠水浸染焊盤。點膠量幾由螺旋泵的旋轉(zhuǎn)時間長短來決議，實踐中應(yīng)依據(jù)室溫、膠水的粘性等選擇泵的旋轉(zhuǎn)時間。
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.