The measurement method of wall thickness and bottom thickness of plastic bottle and the explanation of thickness gauge of plastic bottle

The processing of plastic bottle often adopts the process of injection molding the bottle embryo first and then blow molding In the process of blow molding, because of temperature, equipment and other factors, the thickness of bottle body, bottom and other parts will be uneven The main problems related to the wall thickness of the plastic bottle body are: the bottle neck becomes thinner, the wall of the bottle body is thinner, and the base is spherical 1 The thickness of bottle wall is closely related to many physical properties of PET bottle, especially in the leakage rate of CO2, top pressure strength, internal pressure resistance (burst bottle), vacuum resistance and heat resistance The thin part of the bottle body is generally the weak part of the mechanical properties (such as vertical pressure carrying capacity, internal pressure resistance, vacuum resistance) and barrier properties (such as the penetration rate of water vapor, carbon dioxide and oxygen) of the plastic bottle, which reduces the performance of the whole plastic bottle In order to make the wall thickness meet the requirements of technical standards, several parameters must be controlled during bottle blowing, including temperature, humidity, embryo quality, resin quality and equipment parameter settings 2 Packaging lightweight is the general trend in industry It can not only reduce the waste of packaging materials in production, but also achieve the purpose of environmental protection
Generally speaking, when the packaging containers such as plastic bottles realize the plan of lighter packaging, they will reduce a lot in the production materials, the cost, and the transportation cost during the transportation At the same time, the transportation volume at one time will be increased In this respect, it can also be said that the product cost will be greatly reduced, and the environment will also be maintained Effect At present, there are three common methods to measure the wall thickness and bottom thickness of plastic bottles: first, contact method: this method is widely used now The principle is: put the measuring support rod into the bottle, use its dart head to contact the measuring part, and place the measuring head of the capacity grid sensor on the corresponding part outside the plastic bottle body to contact the bottle body and the dart head Read the thickness on the gauge The accessories of the wall thickness gauge based on this principle are easy to replace and the cost is low II Thickness measurement by magnetic induction method: the principle of this method is based on Hall effect theory When measuring thickness, a small steel ball is placed on one side of the test material, and the probe is placed on the other side Rotating the bottle, the ball receives the magnetic force of the probe and moves at the same time The magnetic induction sensor can measure the distance from the probe to the steel ball, thus obtaining the wall thickness of the plastic bottle The characteristic of this instrument is that it does not damage the sample and is easy to measure However, it is not easy to measure the concave and convex parts of plastic bottles, and it can not fully meet the needs of customers for different parts and different samples to achieve differential precision control 3 Slice method for thickness measurement: This is an original method for wall thickness measurement Limited by the technology at that time, in the early testing of plastic bottles, many testers cut the bottles into pieces, and then use the screw micrometer and caliper to test the thickness value The cost of this method is very low, but it is considered that the accuracy is large and the test efficiency is low Plastic bottle thickness gauge in order to measure the wall thickness and bottom thickness of plastic bottle more effectively, Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd has developed and produced the plastic bottle thickness gauge chy-b, which adopts the contact measurement method, with high mechanical structure stability, fast test, full measuring parts, easy replacement of accessories and low cost Technical advantages of the plastic bottle thickness gauge: ★ adopting the capacitive grid sensing technology, with the digital display function ★ can detect the bottom thickness and wall thickness of the glass bottle two control indicators, one machine dual-purpose ★ test error reaches 0.001mm, Chy-b2 is suitable for measuring the thickness of ampoule bottle, Xilin bottle, oral liquid bottle, infusion bottle, beer bottle, plastic bottle and other bottle bottom and wall in food, medicine, cosmetics and other industries Wall thickness gauge is widely used in quality inspection institutions, drug inspection institutions, packaging material manufacturers, pharmaceutical enterprises, food enterprises, cosmetics enterprises and other units