Plastic bottle wall thickness and thickness measurement method and plastic bottle thickness gauge
The processing of plastic bottles is often carried out by first molding the preforms and then blowing the bottles. In the blow molding process, the thickness of the bottle body, the bottom of the bottle, etc. may be uneven due to factors such as temperature and equipment.
The main problems associated with the wall thickness of the plastic bottle are: thinner bottle neck, thin bottle body, and spherical protrusions on the base.
1. The thickness of the bottle wall is closely related to the physical properties of the PET bottle, especially in the bottle's CO2 leakage rate, top pressure strength, internal pressure resistance (burst), vacuum resistance and heat resistance. The thinner part of the bottle body is generally the weak part of the mechanical properties of the plastic bottle (such as vertical load capacity, internal pressure resistance, vacuum resistance) and barrier properties (such as water vapor, carbon dioxide and oxygen transmission rate). The performance of the entire plastic bottle is reduced. In order to achieve wall thickness within the limits required by the technical standards, multiple parameters must be controlled during blowing, including temperature, humidity, preform quality, resin quality, and equipment parameter settings.
2, packaging lightweight can be said to be the general trend in the industry, it can reduce the waste of materials in the production of packaging materials, but also achieve the purpose of environmental protection.
In general, when a packaging container such as a plastic bottle realizes a more lightweight packaging solution, it will reduce a lot of production materials, reduce the cost a lot, and at the same time reduce the transportation cost on the way of transportation, while at the same time The amount of transportation will also increase. From this aspect, it can be said that the cost of the product is greatly reduced, and the environment will also be maintained.
At present, commonly used plastic bottle wall thickness measurement methods are commonly used in the following three ways:
First, the contact measurement method:
This wall thickness test method is a widely used wall thickness measurement method. The principle is as follows: the measuring support rod is placed in the bottle, and the measuring head is contacted with the dart head, and the measuring head of the capacitive sensor is placed in the corresponding part of the outer part of the plastic bottle body to contact the bottle body and the dart head. Read the thickness value reading on the meter. The wall thickness gauge accessories of this principle are easy to replace and cost less.
Second, the magnetic induction method thickness test:
The principle of this method is based on the 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. Rotate the bottle and the steel ball receives the magnetic force of the probe while moving. The magnetic induction sensor measures the distance from the tip of the probe to the ball to give the wall thickness of the plastic bottle. This instrument is characterized by no damage to the sample and easy measurement. However, the concave and convex portions of the plastic bottle are not easy to measure, and the customer's need for different precision control of different parts and different samples cannot be fully satisfied.
Third, the slice method test thickness:
This is the original method of measuring wall thickness. Subject to technical limitations at the time, in the early testing of plastic bottles, many laboratory technicians shredded the bottles and tested their thickness values ​​with a spiral micrometer and calipers. The cost of this method is very low, but it is considered that the error is large and the test efficiency is low, which is a way of being gradually eliminated.
Plastic bottle thickness gauge
In order to more accurately measure the thickness of the plastic bottle wall, Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd. has developed and produced a plastic bottle thickness gauge CHY-B. The test instrument adopts the contact measurement method, which has high mechanical structure stability and quick test. The measuring part is comprehensive, the parts are easy to replace, and the cost is low.
Plastic bottle thickness gauge technical advantages:
★Using capacitive sensing technology, with digital display function ★It can detect two control indexes of bottom thickness and wall thickness of glass bottle, one machine and two use ★Test accuracy reaches 0.001mm, the value is accurate and stable
Plastic bottle thickness gauge CHY-B2 is suitable for measuring the thickness of bottle bottom and bottle wall of ampoules, vials, oral liquid bottles, infusion bottles, beer bottles, plastic bottles, etc. in food, medicine, cosmetics and other industries. Wall thickness gauges are widely used in quality inspection agencies, drug inspection agencies, packaging materials manufacturers, pharmaceutical companies, food companies, cosmetics companies and other units.
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