What are the advantages and disadvantages of glass products manufactured using the press-and-blow method?
2026-01-07
The press and blow process is one of the mainstream processes for glass container molding, divided into narrow-neck press and blow (NNPB) and wide-neck press and blow (WNPB) methods. It is widely used in the production of soy sauce bottles, wine bottles, beverage bottles, and other products. Its advantages and disadvantages are as follows:
I. Advantages
Uniform bottle wall thickness and strong compressive strength
In the press and blow process, a preform (parison) is first pressed out using a mold, and then blown with air to conform to the molding mold. This allows for precise control of the thickness of each part of the bottle, avoiding uneven thickness. The resulting glass products have good impact and pressure resistance, making them suitable for long-distance sea transportation and stacked storage, reducing transportation damage rates.
High dimensional accuracy and good consistency
The process has a high degree of automation, and the mold specifications are uniform. The glass containers produced have minimal deviations in parameters such as bottle mouth diameter, bottle height, and capacity, making them compatible with automated filling production lines and meeting the large-scale production needs of the food and condiment industries.
Excellent bottle mouth quality and good sealing performance
Especially in the narrow-neck press and blow method, the formed bottle mouth threads are clear and flat, with good compatibility with bottle caps, effectively preventing liquid and gas leakage, making it particularly suitable for storing liquid condiments such as soy sauce and vinegar.
Wide range of applications
It can produce glass containers of different capacities and shapes. Whether it's narrow-neck bottles (soy sauce bottles, wine bottles) or wide-neck bottles (canning jars, honey bottles), it can be adapted, and it supports various glass materials such as high-white glass and crystal-white glass.
High production efficiency, suitable for mass manufacturing
With automated production lines, the molding cycle of the press and blow process is short, and the daily output of a single device can reach tens of thousands of pieces, meeting the large-volume delivery needs of export orders.
II. Disadvantages
High equipment investment cost
The press and blow process requires specialized integrated pressing and blowing molds and automated equipment. The mold design and manufacturing require high precision, and the initial investment in equipment and molds is higher than that of the traditional blow and blow process.
Difficult process adjustment
If product specifications need to be changed (such as adjusting the bottle shape or capacity), the mold needs to be redesigned and the process parameters need to be adjusted, which is time-consuming and less flexible, making it less suitable for small-batch, multi-batch customized orders.
Relatively high energy consumption
The pressing process requires maintaining a high temperature of the molten glass, and the equipment consumes a significant amount of power. Compared to the blowing method, the energy cost per unit of product is slightly higher.
The pressing process requires maintaining a high temperature of the molten glass, and the equipment consumes a significant amount of power. Compared to the blowing method, the energy cost per unit of product is slightly higher.
Strict requirements for raw materials
To ensure the fluidity and molding stability of the molten glass during the pressing and blowing process, high-purity glass raw materials are required, resulting in slightly higher raw material costs compared to ordinary glass.
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