Blow molding is divided into extrusion blowing and injection blowing. Here, the small editor of Jinan mould factory briefly introduces the processing method of blow molding. Injection blowing is re blow molding through germ tube. Injection blowing is also called pull blowing, which is divided into one-step and two-step.

一步法的拉吹则是注塑和拉吹是一台机器完成，先注出型胚（型胚模具须带模温生产）以确保足够吹气膨胀的温度进入拉吹模腔进行拉吹。二步法则是注塑机先注出型胚后再次加温进行拉吹。注吹的瓶子由于是先注出管坯再吹成瓶，其瓶壁更加均匀，而且表明更加光亮没有合缝线更能彰显出产品的档次。

The one-step stretch blow is injection molding and stretch blow is completed by one machine. The mold embryo (the mold embryo must be produced with mold temperature) is injected first to ensure that the temperature of sufficient blow expansion enters the stretch blow mold cavity for stretch blow. The two-step rule is that the injection molding machine first injects the mold embryo and then heats up again for stretch blowing. Because the injection and blowing bottle is first injected with the tube blank and then blown into a bottle, the bottle wall is more uniform, and shows that it is brighter, and the grade of the product can be highlighted without the seam line.

挤吹法：挤吹瓶的瓶底有一条合缝线。先瓶胚、后挤吹的落后工艺，使瓶口边缘不平整、不光滑，手工刮擦后造成的毛刺回降低瓶口密封性，同时平底桶在清洗时容易造成药物残留，发生二次污染。个别水桶生产厂家为了降低成本，将废料、回料或回收水桶作为原料使用，严重影响水桶质量，水桶表面程黑灰、或发红、发紫等。水桶在高温时容易产生有害物质，与呈弱酸性的纯净水发生一系列物、化反应，造成纯净水保质期缩短或变质。

Squeeze blow method: there is a seam line at the bottom of the squeeze blow bottle. The backward process of first bottle embryo and then extrusion and blowing makes the edge of the bottle mouth uneven and unsmooth. The burr caused by manual scraping reduces the sealing of the bottle mouth. At the same time, the flat bottom barrel is easy to cause drug residue and secondary pollution during disinfection and cleaning. In order to reduce costs, individual bucket manufacturers use waste, recycled or recycled buckets as raw materials, which seriously affects the bucket quality, and the bucket surface is black, gray, red, purple, etc. The bucket is easy to produce harmful substances at high temperature, and a series of physical and chemical reactions occur with the weakly acidic purified water, resulting in the shortening or deterioration of the shelf life of the purified water.

注拉吹法：采用进精 密设备，该设备直接调温，注、拉、吹 一 体 化完成，设备工艺决定只能使用粒状的新材料，该原料为美国GE公司生产的食 品 级PC材料（聚碳酸脂）。水桶外观透明光滑、韧性强、桶壁均匀、无杂质、无晶点、分子结构稳定，能确保产品质量并延长产品保质期。

Injection, drawing and blowing method: precision equipment is adopted, which directly regulates the temperature and completes the integration of injection, drawing and blowing. The equipment process determines that only granular new materials can be used. The raw material is food grade PC material (polycarbonate) produced by American GE company. The bucket has transparent and smooth appearance, strong toughness, uniform bucket wall, no impurities, no crystal point and stable molecular structure, which can ensure product quality and prolong product shelf life.