black dyeing shampoo can not only dye black and white hair and gray hair to reduce the signs of aging, but also strengthen, nourish, protect and repair the scalp.
Contains Chinese ginseng extract, ginger extract and Ganoderma lucidum extract, pure natural non-toxic ingredients, no irritating smell, gentle hair coloring and hair care.
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Blow molding is one of the important methods for plastics processing. Its raw materials are high-density polyethylene, low-density polyethylene, rigid polyvinyl chloride, soft polyvinyl chloride, cellulose plastic, polystyrene, polypropylene, polycarbonate and Polyester and so on. Blow molding methods include extrusion blow molding, injection blow molding and biaxial stretch blow molding. Blow-molded containers must be designed with blow-up ratios, extension ratios, vertical load strengths, container stiffness, support surfaces, finish threads, shapes, and outer surfaces.
1. Blow ratio and extension ratio
Blow-up ratio refers to the ratio of the maximum diameter of the plastic part to the parison diameter. The ratio should be selected properly, so that the wall thickness of plastic parts is not uniform and the processing conditions are not easy to grasp. The general blow ratio is 2:1 to 4:1, but it is usually 2:1.
In stretch blown hollow plastics, the ratio of the length of the plastic part to the length of the parison is called the extension ratio. As shown in Figure 39. The choice of extension ratio is very important. After the extension ratio is determined, the length of the parison is determined. 
Vertical load strength: For plastic bottles, it must withstand vertical loads from many sources, the most important being the pressure from the feed nozzle and the capping mechanism.
The potentially vulnerable factor in strength is the angle of inclination on the shoulder of the bottle. As shown in Figure 40. For example, a high-density polyethylene blow-molded bottle should have a slope of at least 12° when the shoulder length (L) is 12.7 mm and 30° when the shoulder length (L) is 30.8 mm. Different resin different weight, different shape of the bottle shoulder. In addition, a large bending radius (R) is used as much as possible in the joint portion between the bottle body and the bottle shoulder, so that the vertical strength of the bottle is improved due to the reduced stress at the turning portion.
2 Bottle structure
The bottom structure of the bottle also has a significant effect on the strength of the bottle, and the acute angle of the bottle body and the turning point at the bottom of the bottle will weaken the vertical strength of the bottle. Therefore, in order to transfer the vertical load uniformly, the bottom corner of the bottle should be curved with a large curvature. See Figure 41.
Bottle structure; For the bottle body with striae or creases, the vertical load strength of the bottle is reduced, but the rigidity of the bottle body can be improved. As shown in Figure 42; a high-standard design is shown in Figure 43. The transition between the trademark area and the non-trademark area adopts a gradual change, but the vertical intensity is high, but the trademark area is not obvious. If the mutation area is used, although the trademark area is obvious, a radial change will cause caulking and stress cracking.
The bottleneck is not in the center of the bottle, but biased to one side, it will form a neck structure. As shown in Figure 44. This type of bottle is arched and tapered at the shoulder of the bottle. When filling, the bottleneck will tilt backwards. This structure brings a series of inconveniences to filling, packaging and stacking. But properly designed, arched structures can easily adjust the balance of the bottle.
Stiffness: In the design of some lightweight bottles, the decorative pattern is not only due to the needs of the styling and decoration, but also in terms of the structure, in order to improve the rigidity of the container. For example, in a round bottle, the groove in the bottle increases the rigidity of the bottle; in the oval bottle, adding some decorative horizontal jagged pattern can improve the rigidity of the container; in the special bottle, you can use some design patterns And beautiful patterns increase its stiffness. See Figure 45.
30ml Sachet Hair Color Shampoo for Men and Women Use
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