A variety of molds are used in the manufacture of glass […]
A variety of molds are used in the manufacture of glass containers: initial molds, initial mold bases, cores or punches, die, forming molds, molding bases, and the like. Where the parts of the mold are joined, a seam line is formed on the container, and care must be taken not to make it too noticeable. Therefore, it is first required that the dimensions of the joints of the modules are accurate, in particular, the edges are preferably in a hot state. In order to prevent wear, the edges of the module are often reinforced with a nickel alloy.
Even in the various parts of the mold, especially at the joints, the dimensions are within the tolerances, and a wide variety of stitching lines may be present on the glass.
The initial molding suture is formed where the two halves of the mold meet. These seam lines are corrugated on the finished container. When the frit is initially blown into a preform, the initial mold bottom is placed on the initial mold. If the joint between the initial mold base and the initial mold is not well formed, the initial mold bottom pattern (seam stitch) will appear at the bottom of the product;
Forming the molding suture appearing along the vertical direction of the container over the entire length of the container;
The stitching line of the molding die is formed at the joint of the molding die and the bottom die.
The basis for eliminating the seam line is to properly adjust the temperature of the feeder. If the temperature of the glass frit is too high or the viscosity is very low, it is easy to blow in or press into the joint of the joint which is not tightly bonded. When the mouth stitching line is thicker, it may be that there is dirt on the joint surface and it cannot be closed tightly. Or during the pressing process (pressure blowing method), the pressure of the punch is too large, or the pressure of closing the initial mold is insufficient or the initial mold closing mechanism, the support frame, etc. are worn, if the joint at the neck joint is Sharp glass edges on the suture can be eliminated by replacing the dirty initial mold, die, core, punch or by enlarging the diameter at the neck of the die.