The development of shape and size The shape of the thread at the bottleneck of the small and medium-sized plastic injection-blow molded mountain. The original shape of the trapezoidal thread (single head) was developed toward a semi-circular long thread. This kind of bottle thread form mainly lies in the good compatibility with the bottle cap, because the moisture resistance of pharmaceutical packaging depends to a large extent on the tightness of the cooperation between the bottle mouth and the bottle cap, which reflects the sealing performance of the bottle mouth. Is the main part of the pros and cons. After the plastic bottle is filled with drugs, a capping machine with an adjustable torsional force should be used to screw caps, and the torque can be selected according to the relevant standards according to the diameter of the caps. The matching of the size of the bottle and the mouthpiece is an important prerequisite for moisture resistance and resistance to steam, and whether the screw cap is tight or not is the key to the quality of the moisture resistance effect. In order to ensure the safety of drugs, we must first improve the sealing of the bottle mouth and increase the moisture-blocking effect. Recently, most manufacturers have adopted electromagnetic induction seals in plastic bottles at the U-Chin aluminum foil gaskets, greatly increasing the sealing performance of plastic bottles. From the cross-section of the bottle neck and bottle shoulder of a round plastic bottle, the neck and bottle shoulders are composed of two tangent circular radii, and are divided into two sections of truncated cone rotating bodies from the cutting point. The main factor affecting the strength of the bottle shoulder is the angle of inclination of the bottle shoulder. When the shoulder is too flat, the bottle body tends to produce ten depressions. If the length of the bottle shoulder is 10mm, the angle of inclination of the shoulder should be greater than 15 degrees. The thickness of this part should not be less than 1mm (refer to the small bottle body). There is also a tendency to increase the thickness of the bottle to ensure that the drug is loaded and used during use. The bottle body does not suffer shoulder fracture. If the bottle body is a circular cylindrical rotating body, the requirement for the bottle body is uniform wall thickness, and if the bottle wall is too thick, the weight of the bottle body will increase, the consumption of raw materials will increase, and at the same time the bottle: the stress in the body will increase and the post contraction will increase. . The bottle wall is too thin to be blow-molded and has low strength. The general requirement is that the wall thickness of the other parts should be uniform except for the thickness of the bottle ribs and the screw part, which is greater than the thickness of the bottle body. However, for the factory to improve the barrier properties and strength of plastic bottles, the thickness of the bottle body is designed to be in the range of 1.5 to 2 mm. At present, the thickness tends to grow toward thickening. Most of the bottoms of plastic bottles are in the form of convex bottoms or double bottoms with flat bottoms, because the center of the bottom of the convex bottom is raised into the bottle to form arches, which can increase the internal pressure resistance of the bottle body and ensure the stability of the bottle body. Sex. Injection molding can also avoid plastic collapse and make the thickness of the bottom of the bottle uniform, while the flat bottom double-rounded bottom structure is mostly used for large-volume plastic bottles, which can better withstand the pressure from the inside of the bottle.
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