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Vacuum precision preserving method for polyethylene glycol terephthalate plastic test tube

A polyethylene terephthalate and plastic test tube technology, which is applied in the field of vacuum precision maintenance of polyethylene terephthalate plastic test tubes, can solve the problems of low leakage rate and inability to meet the requirements, and achieves the vacuum leakage rate reduced effect

Inactive Publication Date: 2004-07-07
北京国药新创科技发展有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the vacuum precision maintenance of test tube containers made of polyester materials at home and abroad has never been satisfactory in terms of practical application and testing. The general vacuum leakage rate is about 10%, which cannot meet the requirements of precision vacuum test tubes for lower leakage rates. Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Take 1kg of polyethylene terephthalate pellets and put them into the air chamber to evacuate, heat to 50°C at the same time, keep it under the state of vacuum degree of 50KPa for 1 hour, and then store it under normal environment.

[0016] 2. The granules treated in step (1) that have been placed for 12 hours are used for injection molding to form test tubes.

[0017] 3. ① Use the above-mentioned test tubes stored for 12 hours to process into finished vacuum test tubes, or:

[0018] ②Heat and degas the above-mentioned test tube, heat it for more than 1 hour, the temperature is 35°C, and the vacuum degree is kept at 40-50KPa, until 12 hours before use, that is, after 12 hours of storage time in ordinary environment, it is used to process into Finished vacuum test tube.

[0019] According to the test tube that present embodiment makes, its vacuum leakage rate can be reduced to 3%.

Embodiment 2

[0021] 1. Take 1 kg of polyethylene terephthalate pellets, the processing steps are the same as in Example 1, heat for 1 hour, the temperature is 100 ° C, and the vacuum is 30KPa;

[0022] 2. Injection molding after standing for 6 hours;

[0023] 3. ① Injection molding after storage for 6 hours; or:

[0024] ②Heating and vacuum treatment: Keep the temperature at 60°C for 1 hour, and the vacuum degree is 30KPa. After the treatment, the test tube is placed in a normal environment for 6 hours and then made into a finished product.

[0025] The vacuum leak rate of the vacuum test tube made in this embodiment is reduced to 1%.

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Abstract

The present invention discloses a polyethylene glycol terephthalate plastic test tube vacuum precision retaining method, mainly including: firstly, heating raw material and evacuating pretreatment, then injection-moulding the pretreated raw material into part in as short time as possible, and making said part into finished product in short time or more heating said part and making it undergo the process of evacuating treatment to make it into finished product. The vacuum leakage rate of vacuum test tube produced by adopting the above-mentioned method can be reduced to 1-2% from original 10%.

Description

(1) Technical field [0001] The invention relates to a method for maintaining the vacuum of a vacuum test tube, in particular to a method for precisely maintaining the vacuum of a polyethylene terephthalate plastic test tube. (2) Background technology [0002] At present, the vacuum precision maintenance of test tube containers made of polyester materials at home and abroad has never been satisfactory in terms of practical application and testing. The general vacuum leakage rate is about 10%, which cannot meet the requirements of precision vacuum test tubes for lower leakage rates. Require. Studies have shown that the main reason for the high vacuum leakage rate of such test tubes is that the gas molecules adsorbed by the polyester material itself are released in the initial stage after the test tube is vacuumed. This phenomenon is called false leakage. (3) Contents of the invention [0003] The purpose of the present invention is to provide a polyethylene terephthalate p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B15/00
Inventor 贾宇东
Owner 北京国药新创科技发展有限公司
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