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How does the flexure of acrylic force come into being and how to solve it?
Source: | Author:tsingchan | Publish time: 2019-10-10 | 380 Views | Share:


 

Acrylic products in various industries popular, thanks to its superior characteristics, regardless of the appearance and ease of use are higher than similar products, so, it is because of this inherent performance, just get more and more people like.

Acrylic products also have a different aspect of extensibility than plastic products. Many thermoplastic materials do not usually have linear stress/tension curves, but acrylic is quite satisfactory at this point. Before designing a product, it is important to know its maximum expected temperature of use, so that many of the problems that can lead to deformation can be avoided in later processing and shaping.

I. processing characteristics of acrylic materials:
1. The material has a linear stress/tension curve;
2. Small deflection during loading;

Ii. Generation of acrylic deflection:

Flexure can be due to the static load of the wind load plate itself, to avoid this effect is too large,
appropriate preventive measures are very important.

* water absorption
Acrylic plate after a long time, can absorb up to 2% of the moisture, will make light box signboard size changes. The degree of absorption and size change depends on the relative humidity of the surrounding atmosphere and the initial moisture content of the plate itself. In general, 100% relative humidity can increase the size by 0.3%, so leave an appropriate expansion margin to prevent marking distortion.
The size of the acrylic extruder may vary slightly in wet conditions because of its low initial moisture content.

* thermal expansion
The linear coefficient of thermal expansion of thermoplastic materials is greater than that of most other materials, so sufficient thermal expansion allowance should be left if the identification is used where the temperature variation is large.
Please note that when acrylic panels are used for outdoor light box signboards, adequate expansion and shrinkage allowances must be left during the design and fabrication process. In Europe, outdoor lightbox signboards are subject to extremes ranging from as low as 20°C in winter to as high as 30°C in summer, with a temperature difference of up to 50°C. An expansion margin of 0.5%, i.e.5 mm/m, is sufficient to cope with any change in panel size due to changes in temperature or humidity.

It is also important that when fixing the acrylic panel of the light box signboard to the mounting frame, sufficient embedding depth must be left to withstand the expansion and contraction margin of the panel, otherwise, in winter windy weather, the acrylic panel may be blown off the fixed frame.

Three, the solution of acrylic flexure:
1. The first and most obvious approach is to use the theory of deflection, but this approach is quite complex, and in many applications the formulas for thermoplastic materials are not always readily available.
2. The second, and preferred, method is to adopt the simpler theory of small deflections, first considering the possible deflections and limiting their permissibility, rather than considering the design from the point of view of stresses, which should be caused by wind loads. This approach has the added advantage of maintaining a good appearance even under wind load and not being easily blown off the mounting frame.

The rule is that the ultimate deflection must not exceed the thickness of the material. Because in this low flexural state, the surface of the material under the tension of the film stress is very small.

Conclusion: the force that press a gram in order to better play its advantage in processing performance, avoid its produce the phenomenon of deflection, before processing to calculate its size and controllable processing temperature, when reached the accurate measurement can effectively reduce the error rate, in this way, processing to produce a product is a high quality and reliable products.






    Acrylic products in various industries popular, thanks to its superior characteristics, regardless of the appearance and ease of use are higher than similar products, so, it is because of this inherent performance, just get more and more people like.

    Acrylic products also have a different aspect of extensibility than plastic products. Many thermoplastic materials do not usually have linear stress/tension curves, but acrylic is quite satisfactory at this point. Before designing a product, it is important to know its maximum expected temperature of use, so that many of the problems that can lead to deformation can be avoided in later processing and shaping.

    
I. processing characteristics of acrylic materials:


1. The material has a linear stress/tension curve;

2. Small deflection during loading;

    Ii. Generation of acrylic deflection:

Flexure can be due to the static load of the wind load plate itself, to avoid this effect is too large, appropriate preventive measures are very important.

* water absorption

Acrylic plate after a long time, can absorb up to 2% of the moisture, will make light box signboard size changes. The degree of absorption and size change depends on the relative humidity of the surrounding atmosphere and the initial moisture content of the plate itself. In general, 100% relative humidity can increase the size by 0.3%, so leave an appropriate expansion margin to prevent marking distortion.

The size of the acrylic extruder may vary slightly in wet conditions because of its low initial moisture content.

* thermal expansion

The linear coefficient of thermal expansion of thermoplastic materials is greater than that of most other materials, so sufficient thermal expansion allowance should be left if the identification is used where the temperature variation is large.

Please note that when acrylic panels are used for outdoor light box signboards, adequate expansion and shrinkage allowances must be left during the design and fabrication process. In Europe, outdoor lightbox signboards are subject to extremes ranging from as low as 20°C in winter to as high as 30°C in summer, with a temperature difference of up to 50°C. An expansion margin of 0.5%, i.e.5 mm/m, is sufficient to cope with any change in panel size due to changes in temperature or humidity.

It is also important that when fixing the acrylic panel of the light box signboard to the mounting frame, sufficient embedding depth must be left to withstand the expansion and contraction margin of the panel, otherwise, in winter windy weather, the acrylic panel may be blown off the fixed frame.

    Three, the solution of acrylic flexure:

1. The first and most obvious approach is to use the theory of deflection, but this approach is quite complex, and in many applications the formulas for thermoplastic materials are not always readily available.

2. The second, and preferred, method is to adopt the simpler theory of small deflections, first considering the possible deflections and limiting their permissibility, rather than considering the design from the point of view of stresses, which should be caused by wind loads. This approach has the added advantage of maintaining a good appearance even under wind load and not being easily blown off the mounting frame.

The rule is that the ultimate deflection must not exceed the thickness of the material. Because in this low flexural state, the surface of the material under the tension of the film stress is very small.

    Conclusion: the force that press a gram in order to better play its advantage in processing performance, avoid its produce the phenomenon of deflection, before processing to calculate its size and controllable processing temperature, when reached the accurate measurement can effectively reduce the error rate, in this way, processing to produce a product is a high quality and reliable products.