TW200538720A - Apparatus and method for on-line measuring the weight uniformity of a continous web with a specific wavelength - Google Patents

Abstract

A light signal is emitted by a specific-wavelength emitting element to a continuous web. After penetrating the continuous web, the light signal is received by a specific-wavelength receiving element and then is converted to an electric signal. According to the electric signal, a computer calculates the weight uniformity of the continuous web by a function of the transmittance of the light signal and the weight per unit area of the continuous web.

Description

200538720 发明 Description of the invention [Technical field to which the invention belongs] The present invention relates to a device and method for measuring uniform weight, and more particularly to the production of continuous ribbons (for example: fiber products (cotton nets, non-woven fabrics, papermaking) , Coated cloth (knitted fabric, woven fabric, non-woven fabric)), film, plastic, glass fiber mat, glass fiber prepreg, leather cloth, coating film, coating material) Device and method for measuring weight uniformity on mode line. [Previous technology] Today's continuous ribbons (for example: fiber products (cotton nets, nonwovens, papermaking, coated fabrics (knitted fabrics, woven fabrics, nonwoven fabrics)), films, plastics, fiberglass, glass fiber prepregs , Leather cloth, coating film, coating material, etc.'s production technology # has reached a considerable degree of sophistication, so its online quality control during production is extremely important. There are several main methods of traditional detection technology: First, the weight of continuous belts is measured directly with an artificial scale and the weight is uniform

However, the analysis error of the qualitative variation number that now appears in the industry.

3 degrees thick. But the ribbon, therefore the capacity 200538720 is easy to damage or change the original physical properties of the continuous ribbon. This phenomenon is especially obvious in the measurement of lightweight continuous ribbons (less than 100g / m2). 3. Radiation method, using a radiation detector placed on top of a continuous strip to measure the physical properties of the continuous strip. This radiation-based measurement method easily destroys the physical properties of the continuous ribbon at the same time, and the radiation radiation is harmful to the human body. Furthermore, based on human health and cost considerations, this method generally uses single-point sampling as the basis for measuring the weight uniformity of continuous ribbons when in use. The conventional technology is a temperature compensation device for measuring the uniformity of the weight of a continuous ribbon photoelectrically as shown in the Republic of China Patent Bulletin No. 557357. Between the combinations, the weight uniformity of the ribbon was measured using the transmittance of the light source signal. However, continuous ribbons of different materials have their own different characteristic spectra, and have different absorption or reflection spectral characteristics in different spectral bands. If the same light source signal is used to measure continuous strips of different materials, the sensitivity of the measurement may be reduced due to the low transmittance of the light source signal, and even the situation of impenetrability may occur. In other words, the same light source is not suitable for measuring continuous ribbons of different materials. In addition, when the continuous belt has various colors or patterns, if the weight is measured uniformly using an ordinary light source signal at this time, the continuous band may be caused by different absorption spectrum characteristics of different colors or patterns. The misjudgment of the uniformity of the weight of the object makes the quality control staff unable to accurately and effectively monitor the production quality of the continuous ribbon on the line. [Abstract] The purpose of the non-brightness is to provide a wavelength-resetting emission element. The measuring device uses special reading to increase the combination of different materials ^, improve the accuracy of online measurement and thus reduce the production: Measurability 'reduces the measurement error, and weight uniformly measures the measurement method' at this specific wavelength The method of photo-deterioration and improving the line. Another object of the present invention is to provide a method for selecting a specific wavelength source signal to be transmitted according to the material without causing the continuous belt to break and measure the production efficiency and quality of the continuous belt. According to the above object of the present invention, a weight average sentence measurement device and method are proposed. The continuous band is irradiated with a measurement light source signal of a specific wavelength, and the signal of the measurement light source that penetrates the continuous web is received, and the quantity of light through the continuous belt is a function of the weight per unit area. The weight uniformity of the continuous ribbon was measured. The weight uniformity measuring device includes at least a first specific wavelength transmitting element, a first specific wavelength receiving element, a signal processor, and a computer. The first specific wavelength transmitting element transmits a measurement light source signal of a specific wavelength to the continuous ribbon, and the first specific wavelength receiving element receives the measurement light source signal after passing through the continuous ribbon, and outputs a measurement electrical signal. The computer calculates the weight uniformity of the continuous ribbon based on the measured electrical signal. The signal processor has a temperature compensation device. The temperature compensation device includes a second specific wavelength transmitting element, a second specific wavelength receiving element, 200538720, and a feedback ratio switch. The characteristics of the second specific wavelength emitting element are the same as those of the first specific wavelength, and the emission characteristic is “iM”, and the emission characteristic is one of the “skins” & test signals. The second specific wavelength receiving element has the same characteristics as the first specific wavelength receiving element, and receives the reference light source signal and generates a reference electrical signal. The feedback comparator compensates the driving current of the first specific wavelength transmitting element and the first specific wavelength receiving element according to the reference electrical signal, respectively. According to a preferred embodiment of the present invention, the emitting element can be selected to use light emitting diodes or laser diodes suitable for ultraviolet light, visible light, or near, middle, and far infrared light depending on the continuous ribbon of different materials. The receiving element is a detector or sensor corresponding to the transmitting element. The above-mentioned specific wavelength range is between 10 and 4800 nm. The signal processor further includes a receiving circuit, a signal amplifier and Integrating circuit, a transmitting circuit, an oscillator, a signal trigger timing, a signal preprocessor, and an analog / digital conversion circuit. The signal amplification and integration circuit triggers the signal trigger timing, so that the oscillator generates a synchronous frequency signal and sends it to The temperature compensation device 'uses the transmitting end circuit to make the first specific wavelength transmitting element generate a measuring light source signal. After the measuring light source signal penetrates the continuous ribbon, it will be received by the first specific wavelength receiving element and generate a The electrical signal is measured. The receiving circuit receives the electrical signal. Then, the electrical signal is processed by the δίΐ signal and processed. The signal amplification and integration circuit integrates the bean voltage and time, and then converts the integrated measurement electrical signal into a digital signal by an analog / digital conversion circuit. This digital signal will be sent to the computer for calculation of continuous bands. The weight uniformity of the object. In addition, the 200538720 is transmitted and the receiving end uses the driving current of the return circuit to flow through the second specific wavelength transmitting element, and the driving current of the circuit flows through the second specific wavelength receiving element, and the comparator is used to correct the ambient temperature. Another preferred embodiment of measuring Fangyue is the above-mentioned weight average sentence measurement, commercial U3 uses a spectral test step. Use 卩 to determine the wavelength of the continuous band ^ and 疋. First perform a spectral test on the continuous band. , Find its characteristic spectrum, and then select a specific wavelength suitable for the weight average sentence measurement of the continuous ribbon according to its absorption spectrum characteristics, and adjust or replace the transmitting element and receiver suitable for the specific wavelength accordingly. Element. [Embodiment] FIG. 1 is a schematic diagram showing a preferred embodiment of the present invention. The weight 2 uniformity measuring device 100 includes The first specific wavelength transmitting element, the first specific wavelength receiving element 104, a signal processor 106, and an electronic device 108. The configuration of the uniform measurement unit 100 is as shown in FIG.物 1, such as cotton mesh, non-woven fabric, papermaking, film, plastic, slope fiber mat, glass fiber prepreg, leather cloth, coated cloth, coated film, coated material, etc. The elements 1 are in contact with the first specific wavelength connection element HM, but are not in contact with the two. In this way, the weight of the continuous ribbon " 〇 is measured by a means of not breaking the continuous tributary 11. The uniformity is shown in Figure 2. The method is described in detail as follows: When a specific wavelength transmitter 202 emits a beam of light through a medium 10 200538720, the physical properties of the light-transmitting medium can be obtained by photon absorption, at the material density D 'The intensity It of the light after transmitting the medium and the intensity I of the light projected at a specific wavelength. 4The relationship between the energy transmission rate per unit area, the absorption of light through the thickness h, the relationship between the weight uniformity (w) and the light transmittance: iL 一 plant aDh

T 丄 ο (1 _ 1) where 1. = Intensity of the light projected at a specific wavelength. Intensity of light after passing through the medium strictly. Α = Coefficient of light absorption of the medium h = Thickness of the medium D = Material density K = D a

(1-2) (1-3) (1-4) (1-5)

Kh = WW = ln (It / I0) Right when the medium is -continuous ribbon 2001, its weight average sentence degree can be deduced by using the equations (1_1) to (1-5), through light transmission讯 A signal is obtained from the relationship between the physical properties of the continuous ribbon 201, and the signal processor 106 (Fig. 1) is used to calculate the average sound of the weight by numerical analysis. Number 3 = A schematic diagram of a preferred embodiment of the present invention is shown. First, perform a spectral test on a continuous band, and find 200538720.

For the continuous 304) 〇 wavelength and adjust or more elements and receiving elements accordingly (step ’test this selected specific

(Step 308). Furthermore, you can also choose i to perform a test step to test whether this wavelength meets the weight uniformity measurement standard. (Step 4 is a flowchart of a device according to a preferred embodiment of the present invention. As shown in FIG. 4 As shown, the signal amplification and integration circuit 450 triggers the signal to touch the timing I 430, so that the oscillator 420 generates a synchronous frequency signal and transmits it to the temperature compensation device 410, and the first specific wavelength transmitting element 102 generates a measurement light source signal. After the light source signal penetrates the continuous ribbon 10, it will be received by the first specific wavelength receiving element 104, and a measurement electrical signal will be generated. The receiving end circuit 404 is responsible for receiving this measurement electrical signal. Then, this amount After the measurement electrical signal is processed by the signal pre-processor 440, the signal amplification and integration circuit 450 is used. The voltage and time are integrated, and the integrated measurement electrical signal is converted into a digital signal by the analog / digital conversion circuit 460. This digital signal will be transmitted to the computer 1 08 for calculating the weight uniformity of the continuous ribbon 110. 12 200538720 Temperature compensation device 4 1 〇 contains a second specific wavelength The transmitting element 4 1 2, the second specific wavelength receiving element 4 14 and a feedback comparator 4 1 6. The first specific wavelength transmitting element 1 102 is the same as the second specific wavelength transmitting element 412, and the first specific wavelength The receiving element 104 is the same as the second specific wavelength receiving element 4 14. The combination of the second specific wavelength transmitting element 412 and the second specific wavelength receiving element 414 has the same characteristics as the first specific wavelength transmitting element 102 and the first specific wavelength. The combination of the wavelength receiving elements 104 is the same, so it can be used as a reference module of the feedback comparator 416 to correctly adjust the driving current of the first specific wavelength transmitting element 102 and the first specific wavelength receiving element 104. Therefore, when transmitting When the driving current of the end circuit 402 flows through the second specific wavelength transmitting element 4 12 and the driving current of the receiving end circuit 4 0 also flows through the second specific wavelength receiving element 414, the second specific wavelength transmitting element 4 12 will A reference light source signal of one specific wavelength is emitted for reception by the second specific wavelength receiving element 4 14 to generate a reference electrical signal. The feedback comparator 4 1 6 is based on the reference electrical signal No., the driving current of the first specific wavelength emitting element 102 and the first specific wavelength receiving element 1 are adjusted to compensate for the difference in ambient temperature. Furthermore, the driving current of the first specific wavelength emitting element 102 is also turned on for temperature compensation. The second specific wavelength emitting element 412 of the device 41 〇 is obtained by integration and amplification to obtain the output voltage. If the output voltage is greater than the reference voltage, the output voltage will decrease. Conversely, if the output voltage is smaller than the reference voltage, the output voltage will increase. On the other hand, the driving current is affected by the average 13 200538720 voltage of the temperature compensation device 4 '. If the average voltage increases, the driving current will increase, and conversely, if the average voltage decreases, the driving current will decrease. For example, when the first specific wavelength emitting element 102 sends a measurement light source signal to the first specific wavelength receiving element 104, if the average voltage becomes larger due to the influence of external temperature, the output in the temperature compensation device 41 The voltage will increase, which will cause the average voltage to decrease, which will reduce the original drive current. This negative feedback method can suppress the temperature change, so that a stable output voltage can be obtained. This document can use visible light, ultraviolet light, near-infrared, mid-infrared, far-infrared light-emitting diodes or laser diodes as the & transmitting element, and the receiving file is a detector or corresponding to the transmitting element or The sensor can not only improve the transmittance and accuracy, but also cover a wider range of light waves. According to the present invention, the spectral range that can be measured by the combination of the transmitting element and the receiving element according to the embodiment can be between 10 and 4800 nm. In the above-mentioned preferred embodiment, an emission element with a specific wavelength is used. Two = :, temperature compensation device, vibrometer with high sensitivity to measure the light. :: two ▼ Uniform weight uniformity. Moreover, according to the appropriate specific wavelength of the continuous belt, it is possible to avoid destroying the continuous belt ::: improve production efficiency and quality, reduce human error, and can reduce: person-U ~ 衣 罝 陈 f earlier (single group hair鼾 3 /, combination of receiving it pieces) In addition to measurement, it can also be listed on the continuous belt to be measured at multiple points (multiple pieces and receiving elements). 200538720 (not shown in the figure) so it can be measured at the same time Measure the uniformity of the longitudinal dimension of the continuous ribbon. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications without departing from the spirit and scope of the present invention. Changes and retouching, so the protection scope of the present invention shall be determined by the scope of the attached patent application. [Brief Description of the Drawings] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to make a detailed description as follows: FIG. 1 FIG. 2 is a schematic diagram of a preferred embodiment of the present invention; FIG. 2 is a schematic diagram of a method of a preferred embodiment of the present invention; FIG. 3 is a flowchart of a method of a preferred embodiment of the present invention And FIG. 4 is a flowchart of a device according to a preferred embodiment of the present invention. [Simple description of component representative symbols] 10 0 ·· Weight uniformity measuring device 102: First specific wavelength transmitting element 1 0 4: First specific wavelength receiving element 106: Signal processor 108: Computer 11 0: Continuous band 200538720 201 Continuous band 202: Specific wavelength transmitter 203: Specific wavelength receiver 302, 304, 306 '308: Step 402: Transmitting circuit 404: Receiving circuit 410: Temperature compensation device 412 Two specific wavelength transmitting elements 414: second specific wavelength receiving element 416: feedback comparator 420: oscillator 430: signal trigger timing 440 ... signal pre-processor 450: signal amplification and integration circuit 460: analog / digital conversion circuit

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Claims (1)

200538720 Patent application scope 1. A weight uniformity measurement device that measures the weight uniformity of a continuous ribbon at a specific wavelength. The weight uniformity measurement device includes at least: a first specific wavelength emission element, Transmits a measurement light source signal of a specific wavelength to the continuous ribbon; a first specific wavelength receiving element receives the measurement light source signal penetrating the continuous ribbon and outputs a measurement electrical signal; a signal A processor with a temperature compensation device, wherein the temperature compensation device includes: a second specific wavelength emitting element having the same characteristics as the first specific wavelength emitting element and emitting one of the specific wavelengths A reference light source signal; a second specific wavelength receiving element having the same characteristics as the first specific wavelength receiving element, receiving the reference light source signal and generating a reference electrical signal; and a feedback comparator , According to the reference electrical signal, respectively compensate the first specific wavelength emitting element and the first special wavelength The drive current of the fixed-wavelength receiving element; and a computer, based on the measured electrical signal, calculates the weight uniformity of the continuous ribbon. 17 200538720 2 · The uniform weight measurement device described in item 1 of the scope of patent application, wherein the signal processor further includes: a transmitter circuit; a signal amplification and integration circuit; a signal trigger timing; an oscillator, The signal amplification and integration circuit triggers the signal trigger timing, so that the oscillator generates a synchronous frequency signal to the temperature compensation device, and the transmitting end circuit causes the first specific wavelength transmitting element to generate the measurement light source signal. A receiving circuit that receives the measurement electrical signal; a signal pre-processor; and an analog / digital conversion circuit in which the measurement electrical signal is processed by the signal pre-processor and then uses the signal amplification and integration circuit Integrate the voltage and time, and convert the measured electrical signal into a digital signal by the analog / digital conversion circuit, and then send the digital signal to the computer. 3. The weight uniformity measuring device according to item 2 of the scope of patent application, wherein a driving current of the transmitting end circuit flows through the second specific wavelength transmitting element, and a driving current of the receiving end circuit flows through the second The specific wavelength receiving element is used to correct the ambient temperature difference by using the feedback comparator. 4 · If the patent scope please! The weight average sentence measurement device described in the item, wherein the range of the specific wavelength is between 10 and 4800. 18 200538720 5. The weight uniformity measuring device according to item j of the scope of the patent application, wherein the -specific wavelength emitting element is a light emitting diode or a two laser diode. 6. If the scope of patent application is the first! The weight measurement device described in the above item, wherein the -specific wavelength receiving element is a detector or a sensor. 7. · A method for measuring weight uniformity, at least comprising: irradiating a continuous ribbon with a measurement light source signal at one of the special wavelengths; and receiving the measurement light source signal penetrating the continuous ribbon through the The transmittance of the continuous ribbon is a function of the weight per unit area, and the weight uniformity of the continuous ribbon is measured. 8 The weight uniformity measurement method as described in item 7 of the scope of application for printed patents, wherein the weight uniformity measurement method further comprises: determining a specific wavelength to which the continuous ribbon is applied by a spectral test step; and Adjust or replace the transmitting element and receiving element suitable for the specific wavelength accordingly. 9 · The method of measuring weight uniformity 200538720 as described in item 8 of the scope of patent application further includes: the method of measuring the weight of the continuous strip 'wherein the method of measuring weight uniformity measures whether the specific wavelength meets the uniformity Standard. 10 · The weight of the 9 dead corpses, as described in item 9 of the scope of the patent application, uniform measurement method, where the standard is selected from ISO 9 (m 4 ητχτ υ / 3 · 4, DIN EN29073, JIS 1085, ASTM D3776_85 And one of EN 29〇73 · 2. 11. According to the weight average sentence measurement method described in the scope of patent application of 8 items, the emitting element is a -light emitting diode or -laser diode. 12. The uniform weight measurement method described in item 8 of the scope of patent application, wherein the receiving element is a sensor. 13. The uniform weight measurement method described in item 7 of the scope of patent application, wherein The inside measurement light source signal is transmitted by a first specific wavelength emitting element and received by a specific wavelength emitting element, wherein the weight uniformity measurement method further includes: transmitting a reference light source signal of the specific wavelength; Receiving the reference light source signal and generating a reference electrical signal; and respectively compensating the driving current of the first specific wavelength transmitting element and the first specific wavelength receiving element according to the reference electrical signal. 14 · If applying for a patent The method of measuring weight uniformity 20 200538720 as described in item 13, wherein the reference light source signal is transmitted using a second specific wavelength transmitting element, and is received using a second specific wavelength receiving element, the second specific wavelength The characteristics of the transmitting element are the same as those of the first specific wavelength transmitting element, and the characteristics of the second specific wavelength receiving element are the same as the first specific wavelength receiving element. Measurement method, wherein the driving current of the first specific wavelength transmitting element and the first specific wavelength receiving element is compensated by a feedback comparator. 16. The weight uniformity measurement as described in item 7 of the scope of patent application "Method of measurement" wherein the weight uniformity measurement method further includes:-a signal amplification and integration circuit to trigger a signal triggering sequence, so that an exciter generates a synchronous frequency signal to the temperature compensation device and a transmitter circuit, Causing the first specific wavelength transmitting element to generate the measurement light source signal; generating the first specific wavelength receiving device; After measuring the electrical signal, the measurement electrical signal is received by a receiving circuit; the signal electrical processor is used to process the measurement electrical signal, and the signal amplification and integration circuit is used to make the voltage and time of the measurement electrical signal. Integrate; convert the measured electrical signal that has been integrated into a digital signal with an analog / digital conversion circuit; and send the digital signal to a computer for calculating the weight of the continuous ribbon 21 200538720 uniformity. 1 7 The method of equalizing weight as described in item 6 of the patent application scope, wherein a driving current of the transmitting circuit flows through the second specific wavelength transmitting element, and a driving current of the receiving circuit flows through the second specific The wavelength receiver is used to correct the ambient temperature difference by using the feedback comparator. 18. The weight average sentence measurement method described in item 7 of the scope of patent application ... The range of the specific wavelength in the range from 10 to side coffee. twenty two