As the key component of the bottle sealing, the Customized Glass cap will seriously affect the quality of the finished product if the quality is not up to standard, so we must control the aluminum-plastic cap.
In order to avoid problems in the later stage, it is necessary to understand the factors affecting the quality of the aluminum-plastic cover in advance.
quality of Customized Glass cap
Whether it is an all-aluminum cover or customized glass cap, or whether it is a tear-off cover, the aluminum-plastic cover of the oral liquid is based on the aluminum cover.
The aluminum cover of the oral liquid is made of industrial pure aluminum or customized glass cap, which meets the requirements, and other grades of aluminum are also used.
Among them, industrial pure aluminum has high plasticity, low hardness and high extension rate.
The customized glass cap produced by it is easy to be rolled during sealing, so the lock of the sealing is smooth and smooth, not easy to wrinkle, and the fit between the cap and the bottle mouth is good. it is good.
At the same time, the hardness HV value of the aluminum cover has a standard for each manufacturer. If it is too low or too high, it cannot meet the requirements of good sealing.
In addition, the wall thickness of the aluminum cover also has a great influence on the sealing quality and qualification rate.
Generally, the standard for the wall thickness of the customized glass cap is 0.2mm, and the range of variation is 0.18-0.22mm.
However, the actual wall thickness of the domestic aluminum cover is 0.14-0.26mm, and the thinner aluminum cover (especially the aluminum cover with larger diameter) is easy to wrinkle when it is sealed.
In order to achieve a better sealing effect, the matching gap between the customized glass cap and the bottle mouth should be slightly smaller, and the height of the aluminum cap should be correspondingly shorter.
Fitting condition of customized glass cap and bottle mouth
The fit of the customized glass cap and the bottle mouth has a great influence on the sealing quality, including the radial fit tolerance and the axial (height direction) fit tolerance of the aluminum-plastic cap and the bottle mouth.
In the radial fit tolerance group, there are two fit dimensions including the inner diameter of the customized glass cap D1 and the outer diameter of the bottle mouth D2. Generally, the fit gap is 0.3mm–0.4mm.
When the gap is too small, the “covering” process will be incorrect and the “covering” will not be installed; when the gap is too large, the cover is likely to fall off, the shape of the lock is not round, and the sealing is easy to occur in the capping process.
Not tight, easy to loose and so on. In addition, for the customized glass cap with thicker wall thickness (0.2–0.26mm), a larger matching gap can be appropriately selected.
The above is an introduction to the factors that affect the quality of the customized glass cap. By understanding the above two factors, you can well avoid the problem of finished products.
