CN110006682B

CN110006682B - Sampling method for PVB laminated glass snowflake degumming

Info

Publication number: CN110006682B
Application number: CN201910351591.XA
Authority: CN
Inventors: 段晓霞; 孙龙飞; 梁正佳; 李玲玲; 马宁; 岳龙
Original assignee: CRRC Tangshan Co Ltd
Current assignee: CRRC Tangshan Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2021-12-21
Anticipated expiration: 2039-04-28
Also published as: CN110006682A

Abstract

The invention discloses a sampling method for snowflake degumming of PVB (polyvinyl butyral) laminated glass, which comprises the steps of taking the joint of the top corner of a side window of the PVB laminated glass to be sampled as a cutting point; cutting at the cutting point to obtain a glass sample; carrying out toughened glass crushing treatment on the glass sample to obtain a fragment sample; the PVB adhesive film extracted from the fragment sample can quickly extract a complete sample on the premise of ensuring the integrity of the PVB laminated glass.

Description

Sampling method for PVB laminated glass snowflake degumming

Technical Field

The invention relates to the technical field of testing, in particular to a sampling method for snowflake degumming of PVB laminated glass.

Background

The PVB laminated glass is a side window material commonly adopted by the high-speed rail motor train unit at present, and the PVB is usually degummed in the using process. PVB has good elasticity and high breaking strength. This kind of performance of PVB makes PVB laminated glass can be less than the influence and the destruction of external mechanical force well, guarantees simultaneously that glass is receiving the broken back of impact, and the piece that produces can not fly away from the film layer yet to laminated glass after the destruction can keep certain visibility, thereby plays good safety protection's effect. Due to the quality reasons of the PVB film and the aging problem of the PVB film, the phenomenon of snowflake degumming of a PVB layer often occurs in the actual use process of glass, the snowflake degumming inevitably affects the service performance and the safety performance of the glass, and once the snowflake degumming occurs in the PVB laminated glass, the failed PVB adhesive film is difficult to obtain. A method for rapid PVB sampling is therefore highly desirable.

The existing PVB sampling method is that side window glass is directly knocked, after outer layer glass is cracked, a PVB adhesive film is stripped, but due to knocking, glass scraps penetrate through the adhesive film, extra pollutants and damage are introduced into the adhesive film, and therefore failure information is damaged. There is therefore a need for an effective way to evaluate the effect of PVB degumming on the performance of glass.

Disclosure of Invention

The embodiment of the invention aims to provide a PVB laminated glass snowflake degumming sampling method, which can quickly extract a complete sample on the premise of ensuring the integrity of PVB laminated glass.

In order to achieve the above object, an embodiment of the present invention provides a sampling method for PVB laminated glass snowflake degumming, which comprises the following steps:

taking the joint of the side window vertex angle of the PVB laminated glass to be sampled as a cutting point;

cutting at the cutting point to obtain a glass sample;

carrying out toughened glass crushing treatment on the glass sample to obtain a fragment sample;

PVB adhesive film extracted from the chip sample.

Further, the cutting treatment is performed at the cutting point to obtain a glass sample, specifically:

aligning and cutting into the cutting point by using a cutter head of an ultrasonic cutting knife, and expanding the seam width of the cutting point;

and cutting the cutter head of the ultrasonic cutting knife deeply into the PVB laminated glass to be sampled by a preset cutting depth, and cutting out the glass containing a PVB adhesive film to obtain a glass sample.

Further, the preset cutting depth is larger than or equal to half of the size of the snowflake stripes in the PVB laminated glass to be sampled.

Further, the joint of the side window vertex angle of the PVB laminated glass to be sampled comprises the joint of any one of the four corners of the side window of the PVB laminated glass to be sampled.

Further, the glass sample is subjected to toughened glass crushing treatment to obtain a fragment sample, and the method specifically comprises the following steps:

and carrying out one-time smashing treatment on the glass sample through a window breaker to obtain a fragment sample.

Further, the frequency of the ultrasonic cutting knife is 20 kHz.

Further, the power of the ultrasonic cutting knife is 100W.

The embodiment of the invention has the following beneficial effects:

the invention provides a PVB laminated glass snowflake degumming sampling method, which comprises the steps of taking the joint of the top corner of a side window of PVB laminated glass to be sampled as a cutting point; cutting at the cutting point to obtain a glass sample; carrying out toughened glass crushing treatment on the glass sample to obtain a fragment sample; the PVB adhesive film extracted from the fragment sample can quickly extract a complete sample on the premise of ensuring the integrity of PVB laminated glass.

Drawings

Fig. 1 is a schematic flow diagram of one embodiment of a sampling method for snowflake degumming of PVB laminated glass provided by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a sampling method for snowflake degumming of PVB laminated glass provided by the present invention. As shown in fig. 1, the authentication method includes steps S1 to S4, which are as follows:

and S1, taking the joint of the side window top corner of the PVB laminated glass to be sampled as a cutting point.

The joint of the top corner of the side window of the PVB laminated glass to be sampled includes the joint of any one of the four corners of the side window of the PVB laminated glass to be sampled.

In this embodiment, since the snowflake phenomenon is only present around the side window, only the glass around the side window needs to be taken out to avoid an excessive workload. Because the PVB laminated glass is formed by pressing two pieces of toughened glass through PVB, seams exist around the side window.

And S2, performing cutting treatment at the cutting point to obtain the glass sample.

In this embodiment, step S2 specifically includes: aligning and cutting into the cutting point by using a cutter head of an ultrasonic cutting knife, and expanding the seam width of the cutting point; and cutting the cutter head of the ultrasonic cutting knife deeply into the PVB laminated glass to be sampled by a preset cutting depth, and cutting out the glass containing a PVB adhesive film to obtain a glass sample.

Note that the preset cut depth is greater than or equal to half of the size of the snowflake stripes in the PVB laminated glass to be sampled.

A typical PVB laminated glass consists of PVB laminated glass and a polyurethane sealant. The polyurethane sealant covers the periphery of the PVB laminated glass to prevent water vapor from entering. If pneumatic cutting knife or ordinary cutting knife cut off and cover the polyurethane that side window glass is glued all around, its sharp blade will destroy PVB laminated glass, also leads to the polyurethane to glue the part simultaneously and remain, influences the integrity that follow-up PVB intermediate layer took out to it is higher to artifical technical requirement, and easily leads to glass damage all around, directly damages PVB laminated glass, causes a large amount of artifical wastes simultaneously.

And adopt 20kHz, 100W's supersound cutting knife, the seam crossing lower sword in arbitrary one corner of side window four corners, make the seam grow gradually, the degree of depth that cuts into until the tool bit reaches side window glass snowflake stripe size more than half, guarantee the integrity at glass both ends, also guarantee PVB laminated glass's integrity simultaneously, and adopt supersound cutting knife to cut the polyurethane glue that covers side window glass all around, the polyurethane glue can not bond on the cutting edge, the supersound cutting knife is sharp so unlike the cutting edge of pneumatic cutting knife, can be with being heated the melting by the local part of cutting, consequently, the effectual PVB laminated glass that guarantees directly exposes, further assurance PVB laminated glass's integrity.

And S3, performing toughened glass crushing treatment on the glass sample to obtain a fragment sample.

In this embodiment, step S3 specifically includes: and carrying out one-time smashing treatment on the glass sample through a window breaker to obtain a fragment sample.

In the embodiment of the invention, if tools such as a common safety hammer are adopted, knocking needs to be carried out for many times, the uniformity cannot be ensured due to too much force, a PVB adhesive film is easily damaged for the second time when the force is too large, the frequency is increased when the force is too small, and the uncertainty of manpower is increased.

And adopt the window breaker to beat the sample, can once only break glass, but not be limited to and use window breaker to strike many times, can avoid PVB laminated glass to receive secondary damage, also solved the cost of labor problem.

And S4, extracting PVB adhesive films from the fragment samples.

Therefore, the sampling method for the snowflake degumming of the PVB laminated glass provided by the embodiment of the invention comprises the steps of taking the joint of the top corner of the side window of the PVB laminated glass to be sampled as a cutting point; cutting at the cutting point to obtain a glass sample; carrying out toughened glass crushing treatment on the glass sample to obtain a fragment sample; the PVB adhesive film extracted from the fragment sample has the following beneficial effects by adopting the embodiment provided by the invention:

(1) adopt the supersound cutting knife to cut the polyurethane that covers around side window glass and glue, polyurethane glues can not bond on the cutting edge, and the cutting edge of supersound cutting knife is not sharp like pneumatic cutting knife, consequently effectual assurance PVB laminated glass directly exposes, and can guarantee PVB laminated glass's integrity.

(2) In the further sampling process, an ultrasonic cutting knife is adopted, 20kHz is selected under the condition of being close to the resonance frequency of glass, and meanwhile, under the condition of higher ultrasonic power, the outer-layer glass can be effectively damaged, and meanwhile, the adhesive film is not damaged, so that the integrity of the adhesive film is ensured, and the failure information of the adhesive film is kept.

(3) The window breaker is adopted to beat the sample, so that the glass can be broken at one time, the PVB laminated glass is prevented from being damaged secondarily, and the problem of labor cost is solved.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. A PVB laminated glass snowflake degumming sampling method is characterized by comprising the following steps:

cutting at the cutting point to obtain a glass sample; the method specifically comprises the following steps: aligning and cutting into the cutting point by using a cutter head of an ultrasonic cutting knife, and expanding the seam width of the cutting point; cutting the cutter head of the ultrasonic cutting knife deeply into the PVB laminated glass to be sampled by a preset cutting depth, and cutting out the glass containing a PVB adhesive film to obtain a glass sample;

carrying out toughened glass crushing treatment on the glass sample to obtain a fragment sample; the method specifically comprises the following steps: carrying out one-time breaking treatment on the glass sample through a window breaker to obtain a fragment sample;

PVB adhesive film extracted from the chip sample.

2. The PVB laminated glass snowflake degumming sampling method according to claim 1, wherein the predetermined cutting depth is greater than or equal to half the size of the snowflake streak in the PVB laminated glass to be sampled.

3. The method for sampling PVB laminated glass through snowflake degumming according to claim 1, wherein the joints at the top corners of the side window of the PVB laminated glass to be sampled comprise the joints at any one of the four corners of the side window of the PVB laminated glass to be sampled.

4. The PVB laminated glass snowflake degumming sampling method according to claim 1, wherein the ultrasonic cutting blade has a frequency of 20 kHz.

5. The PVB laminated glass snowflake degumming sampling method according to claim 1, wherein the power of the ultrasonic cutting blade is 100W.