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Causes of problems in the production of preform molds
Jan 01,2023
Causes of problems in the production of preform molds
At the beginning, consumers only paid attention to the quality of the beverage itself, but now they gradually begin to pay attention to the quality of the outer packaging of the beverage and the quality of the preform mold. The quality of PET bottles depends on the quality of the preforms supplied. There are two types of preforms for injection molding, one is long and the other is short. The preform with long glue mouth is cut off because of the glue mouth at the bottom, so that the tension is evenly distributed during the blowing process, so that the quality of the blown bottle will be better, and the cut part can be recycled, which is conducive to saving raw material costs . The control of the preform quality in the production process depends on the degree of control to prevent the preform from being scratched during the transportation process. At present, most domestic manufacturers use belt conveying for preform conveying, which is a relatively ancient method of conveying technology. Disadvantages of this shipping:
1. When the preform comes out of the injection molding machine, the temperature is between 45°C and 55°C. Falling directly onto the belt can create bruises between the preforms.
2. Other preforms are piled up disorderly on the belt, and the preforms are not cooled evenly.
3. When the preforms come out of the injection molding machine, there may be quality problems with the preforms injected in a certain cavity, and it is difficult to distinguish which cavity the preforms have problems with if they are piled up in disorder.
4. When the injection molding machine injects the preform with the preform mold, a certain cavity may form a cavity, which is arranged in a disorderly manner. If the count is still based on the number of injection cavities, the count will be inaccurate.
5. Belt conveying, the quality control of the preforms must be done manually, firstly, the quality is difficult to control, and secondly, too many people contact easily cause pollution.
At present, Japan, South Korea, and Taiwan generally adopt the method of conveying preforms with chain plates that clamp the bottle mouth in a certain order. Its production process:
Preform forming machine-manipulator to take out all glue mouth machine-finished product front section conveying bottle mouth finished product machine-finished product rear section conveying-inspecting machine-counting and packing equipment.
Advantages of this shipping method:
1. The manipulator takes out the preforms from the injection molding machine, and the orientation of each preform is numbered. The preform is taken out by the robot, not directly falling to prevent scratches. Because the position of each preform has a number, when the injection molding machine has a problem with the injection, it can accurately find out which cavity has the problem.
2. The preforms are transported by clamping the neck of the preforms with the plate chain, so that the preforms are transported in a certain order. In this way, the preforms are cooled evenly, which is convenient for counting, and the counting error of every 10,000 preforms is within ±5.
3. The entire production line is automated, with a small number of personnel.
