CN102358045A - Processing method for strip Fresnel lens - Google Patents
Processing method for strip Fresnel lens Download PDFInfo
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- CN102358045A CN102358045A CN2011102315036A CN201110231503A CN102358045A CN 102358045 A CN102358045 A CN 102358045A CN 2011102315036 A CN2011102315036 A CN 2011102315036A CN 201110231503 A CN201110231503 A CN 201110231503A CN 102358045 A CN102358045 A CN 102358045A
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- fresnel
- roller
- processing method
- bar shaped
- roll
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- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
The present invention discloses a processing method for a strip Fresnel lens. The method comprises the following steps: plasticizing resin; adding the plasticized material into a calender to carry out calendering into sheets; rolling the calendered sheets by a Fresnel insection roller and a smooth roller to press out Fresnel insection, and synchronously cooling; eliminate internal stress; after cooling, relaxed placing the Fresnel hard sheets to eliminate the internal stress; cutting and packaging. According to the present invention, the heating roller, the treatments of heating and calendaring are adopted, the Fresnel insection roller is adopted to carry out extruding and forming, the threading method is adopted to cool and shape the front side and the back side of the hardware; the process of the invention has characteristics of simpleness, rapidness and high yield, wherein the yield of the present invention is increased by thousands of times compared to the yield produced by the original molding method; the cost is substantially reduced, wherein the cost can be reduced by hundreds of times; the quality precision, ie., the cusp angle of the refraction angle of the Fresnel lens, is ensured, such that the case of the scattering is not generated; the finish can achieve more than 10.
Description
Technical field
The present invention relates to a kind of processing method of bar shaped Fresnel Lenses.
Background technology
Known Fresnel Lenses processing and forming technology adopts mold pressing, injection moulding or casting.This existing production method is a discontinuous, so yield poorly, cost is high; And the R fillet that the crown of the Fresnel Lenses that existing method processes forms is easy to generate scattering, and the quality precision is low; And poor surface smoothness; Fineness is generally at
below 10, and light transmittance is difficult to guarantee.
Summary of the invention
Goal of the invention: the objective of the invention is to overcome the deficiency of prior art, but the processing and forming technology of the Fresnel Lenses that a kind of continuity production, output are high, cost is low is provided.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of processing method of bar shaped Fresnel Lenses, it comprises the steps:
(1) plastifies resin;
(2) material after the plasticizing gets into the calender calendering in flakes;
(3) calendared sheet extrudes the Fresnel groove through Fresnel groove roller and smooth roll, while and roll and cool off;
(4) eliminate internal stress: internal stress is eliminated in the placement that the hard sheet of cooled Fresnel is lax;
(5) cutting, packing.
Wherein, step (2) before, the material after the plasticizing filters earlier.
Wherein, in the step (3), the linear velocity of Fresnel groove roller and smooth roll is 200-250m/min; The temperature of Fresnel line sheet will be cooled to 30～60 ℃.
Wherein, in the step (2), the linear velocity of the stack of calender is than the linear velocity low 30～40% of Fresnel groove roller.
Wherein, the spacing between the roller of described calender and the Fresnel groove roller is 350～500mm.
Beneficial effect: (1) the present invention adopts warm-up mill, adds hot calender, promptly utilizes the extrusion modling of Fresnel groove roller, and adopts the method for connecting to make hardware positive and negative cooling and shaping immediately; Technology of the present invention is simple, speed is fast, output is high, and the output that output of the present invention is compared original die pressing production can improve several thousand times; Cost also reduces greatly, and cost can reduce hundred times.
(2) quality precision, promptly the wedge angle angle at the refraction angle of Fresnel Lenses is guaranteed, scattering can not occur.
(3) fineness can reach
more than 10.
Description of drawings
Fig. 1 is a flow sheet of the present invention.
Fig. 2 is the structural representation of Fresnel groove roller of the present invention.
The specific embodiment:
According to following embodiment, can better understand the present invention.Yet, those skilled in the art will readily understand that the described concrete material proportion of embodiment, process conditions and result thereof only are used to explain the present invention, and the present invention that should also can not limit in claims to be described in detail.
Process of the present invention is as shown in Figure 1, the material after the plasticizing is got into calender 1 roll, and the calendering back gets into Fresnel groove roller 2 and carries out moulding with smooth roll 3; Wherein be provided with the cooling-water duct that connects whole smooth roll roll body in the smooth roll 3, when carrying out moulding, Yi Bian press the Fresnel line, Yi Bian cool off; Get into conveyer belt then, eliminate internal stress while carry; Cutting, packing gets final product.
Embodiment 1:
1, gets transparent, aging-resistant polyvinyl chloride resin 500kg, add kneader and mediate about 30min, change banbury plasticizing 10min over to, get into the feeding machine plasticizing then and filter.
The thermoplastic plastic that 2, will plastify basically roll forming in the roller of heat.
Material gets into the four-roll calender calendering in flakes, and the linear velocity of the stack of calender is 120m/min.
3, calendared sheet is pressed the Fresnel line through Fresnel groove roller and smooth roll, and the limit flanging is cooled off, and the temperature of Fresnel line sheet is cooled to about 50 ℃.Undercooling (less than 30 ℃), the globule can appear in the roll surface of Fresnel groove roller and smooth roll, also can influence product quality; The linear velocity of Fresnel groove roller and smooth roll is 200m/min, and Fresnel groove roller and smooth roll linear velocity should be not excessive, otherwise cold stretch can occur, cause the product internal stress, deposits after-contraction and increases, and exhibition is uneven.
Some bar shaped grooves parallel to each other are arranged on the surface of bar shaped Fresnel Lenses of the present invention, and as shown in Figure 2, the body of roll 4 of described Fresnel groove roller is provided with the groove 5 along the roller circumferencial direction that is complementary with the bar shaped groove; Be provided with cooling duct 6 in the body of roll 4; The incidence angle of described groove 5 and refraction angle can obtain according to the law of refraction, the law of refraction:
Nsin α i=n
oSin θ i formula (1)
Wherein, α i is an incidence angle, and θ i is the refraction angle, n
oBe air refraction=1, n is the material refractive index.
Can calculate the refraction angle or the incidence angle of each groove on the Fresnel groove roller according to formula (1).
In the above-mentioned formula (2), the corner angle of Fresnel tooth are φ, and n is the refractive index of material, and x is the distance of the center of certain Fresnel tooth to primary optical axis; F is a focal length.After material and focal length are confirmed, can calculate the corner angle φ of each Fresnel tooth according to formula (2), and then obtain the facewidth of each Fresnel tooth.When tooth pitch strengthens, under the situation of same tooth top and root fillet, can make light loss establish minimizing, tooth pitch strengthens then plastics thickness thickening, because the general thickness that adopts 0.45～1cm of Fresnel gear piece, so the tooth pitch that the design adopts is 0.5
-3M～1.2
-3Between the m, tooth depth is 0.351
-3～0.702
-3Between the m.
Be provided with the cooling-water duct of perforation simultaneously in the inside of Fresnel groove roller and smooth roll, can lead to cooling water, on one side can press the Fresnel line like this, Yi Bian carry out cooling and shaping.
As required, through regulating the distance between Fresnel groove roller and the smooth roll, can process the Fresnel Lenses of different-thickness.The thickness of general Fresnel Lenses is at 0.45～1mm.
Fresnel groove roller and smooth roll are profile shell, again as doff roll.Strip down from the stack of calender and get into profile shell (Fresnel groove roller and smooth roll) being in sheet material under the mecystasis, sheet material must be stretched.This stretching was both gained in strength, and had increased output again; Want appropriateness but stretch, so the linear velocity of Fresnel groove roller is than the linear velocity of the stack of calender fast 40%.Simultaneously, for fear of cold stretch, doff roll should be as far as possible near stack, and the distance between stack and the doff roll is 350mm; To prevent the sub-cooled of sheet material.
4, eliminate internal stress: the placement that the hard sheet of cooled Fresnel is lax; The hard sheet of bar shaped Fresnel is smooth behind the cooling and shaping loosely is placed on for no reason on the rubber conveyer belt.Can reduce or eliminate the internal stress that product produces in the production process in front like this.
5, cutting, packing gets final product.
Because of the Fresnel groove when the transparent surface, in the time of near light incides crown, through the refraction of the working face of tooth, part light can not gather scattering in focus (burnt band) and produces loss; And groove is at transparent surface, and tooth root portion accumulates dust and dirt easily, influences light transmittance.So bar shaped Fresnel Lenses of the present invention in use, the Fresnel groove should be positioned at shady face.
Embodiment 2:
1, gets transparent and ageing-resistant, anti-ultraviolet PET500kg, add the double screw extruder extrusion plasticizing.
The thermoplastic plastic that 2, will plastify basically roll forming in the roller of heat.
Material gets into the four-roll calender calendering in flakes then, and the linear velocity of the stack of calender is 175m/min.
3, calendared sheet is pressed the Fresnel line through Fresnel groove roller and smooth roll, and the limit flanging is cooled off, and the temperature of Fresnel line sheet is cooled to about 45 ℃; Undercooling, the globule appears in the roll surface of Fresnel groove roller and smooth roll, also can influence product quality; The linear velocity of Fresnel groove roller and smooth roll is 250m/min, and Fresnel groove roller and smooth roll linear velocity should be not excessive, otherwise cold stretch occurs, cause the product internal stress, deposits after-contraction and increases, and exhibition is uneven.
Some bar shaped grooves parallel to each other are arranged on the surface of bar shaped Fresnel Lenses of the present invention, and as shown in Figure 2, the body of roll 4 of described Fresnel groove roller is provided with the groove 5 along the roller circumferencial direction that is complementary with the bar shaped groove; Be provided with the cooling duct 6 of perforation in the body of roll 4; The incidence angle of described groove 5 and refraction angle can obtain according to the law of refraction, the law of refraction: nsin α i=n
oSin θ i
Wherein, α i is that incidence angle θ i is refraction angle n
oFor air refraction=1 n is the plastics refractive index
Can calculate the refraction angle or the incidence angle of each groove on the Fresnel groove roller according to above-mentioned formula, the confirming of the Fresnel groove facewidth with embodiment 1.Be provided with the cooling-water duct of perforation simultaneously in the inside of Fresnel groove roller and smooth roll, can lead to cooling water, on one side can press the Fresnel line like this, Yi Bian carry out cooling and shaping.。
Calibrator can be measured the thickness of Fresnel Lenses automatically, and regulates the distance between Fresnel groove roller and the smooth roll automatically, and then processes the Fresnel Lenses of different-thickness.The thickness of general Fresnel Lenses is at 0.45～1mm.
Fresnel groove roller and smooth roll are profile shell, again as doff roll.Strip down from the stack of calender and get into profile shell (Fresnel groove roller and smooth roll) being in sheet material under the mecystasis, sheet material must be stretched.This stretching was both gained in strength, and had increased output again; Want appropriateness but stretch, the linear velocity of Fresnel groove roller is than the linear velocity of the stack of calender fast 30%.For fear of cold stretch, doff roll should be as far as possible near stack, between stack and the profile shell apart from 400mm; To prevent the sub-cooled of sheet material.
4, eliminate internal stress: the placement that the hard sheet of cooled Fresnel is lax; The hard sheet of bar shaped Fresnel is smooth behind the cooling and shaping loosely is placed on for no reason on the rubber conveyer belt.Can reduce or eliminate the internal stress that product produces in the production process in front like this.
5, cutting, packing gets final product.
Because of the Fresnel groove when the transparent surface, in the time of near light incides crown, through the refraction of the working face of tooth, part light can not gather scattering in focus (burnt band) and produces loss; And groove is at transparent surface, and tooth root portion accumulates dust and dirt easily, influences light transmittance.So bar shaped Fresnel Lenses of the present invention in use, the Fresnel groove should be positioned at shady face.
Claims (6)
1. the processing method of a bar shaped Fresnel Lenses is characterized in that it comprises the steps:
(1) plastifies resin;
(2) material after the plasticizing gets into the calender calendering in flakes;
(3) calendared sheet extrudes the Fresnel groove through Fresnel groove roller and smooth roll, while and roll and cool off;
(4) eliminate internal stress: internal stress is eliminated in the placement that the hard sheet of cooled Fresnel is lax;
(5) cutting, packing.
2. the processing method of bar shaped Fresnel Lenses according to claim 1 is characterized in that it comprises the steps: step (2) before, and the material after the plasticizing filters earlier.
3. the processing method of bar shaped Fresnel Lenses according to claim 1 is characterized in that it comprises the steps: that in the step (3), the linear velocity of Fresnel groove roller and smooth roll is 200-250m/min.
4. according to the processing method of claim 1 or 3 described bar shaped Fresnel Lenses, it is characterized in that it comprises the steps: in the step (2), the linear velocity of the stack of calender is than the linear velocity low 30～40% of Fresnel groove roller.
5. the processing method of bar shaped Fresnel Lenses according to claim 1 is characterized in that it comprises the steps: that in the step (3), the temperature of Fresnel line sheet will be cooled to 30～60 ℃.
6. the processing method of bar shaped Fresnel Lenses according to claim 1 is characterized in that it comprises the steps: that the roller of described calender and the spacing between the Fresnel groove roller are 350～500mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102315036A CN102358045A (en) | 2011-08-12 | 2011-08-12 | Processing method for strip Fresnel lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102315036A CN102358045A (en) | 2011-08-12 | 2011-08-12 | Processing method for strip Fresnel lens |
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| Publication Number | Publication Date |
|---|---|
| CN102358045A true CN102358045A (en) | 2012-02-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102315036A Pending CN102358045A (en) | 2011-08-12 | 2011-08-12 | Processing method for strip Fresnel lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809770A (en) * | 2012-08-07 | 2012-12-05 | 南京索尔玻璃科技有限公司 | Preparation method of linear Fresnel lens and Fresnel lens prepared by preparation method |
| CN105856597A (en) * | 2016-04-28 | 2016-08-17 | 芜湖利通新材料有限公司 | Calendaring process for manufacturing PVC (polyvinyl chloride) rubber cover |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065924A (en) * | 1991-04-13 | 1992-11-04 | 邵阳市玻璃厂 | Solarv energy low-power condensing lens and production method thereof |
| CN1847175A (en) * | 2005-04-17 | 2006-10-18 | 谢骏峰 | Painted glass tile producing process and apparatus |
| JP2008088303A (en) * | 2006-10-02 | 2008-04-17 | Sumitomo Electric Fine Polymer Inc | Transparent resin molded body, optical lens and optical film |
| CN201788979U (en) * | 2010-07-01 | 2011-04-06 | 王子韩 | Solar tile-shaped slot type cylindrical condenser |
| CN102096125A (en) * | 2011-01-13 | 2011-06-15 | 北京工业大学 | Manufacturing method and device of light-focusing Fresnel lens |
-
2011
- 2011-08-12 CN CN2011102315036A patent/CN102358045A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065924A (en) * | 1991-04-13 | 1992-11-04 | 邵阳市玻璃厂 | Solarv energy low-power condensing lens and production method thereof |
| CN1847175A (en) * | 2005-04-17 | 2006-10-18 | 谢骏峰 | Painted glass tile producing process and apparatus |
| JP2008088303A (en) * | 2006-10-02 | 2008-04-17 | Sumitomo Electric Fine Polymer Inc | Transparent resin molded body, optical lens and optical film |
| CN201788979U (en) * | 2010-07-01 | 2011-04-06 | 王子韩 | Solar tile-shaped slot type cylindrical condenser |
| CN102096125A (en) * | 2011-01-13 | 2011-06-15 | 北京工业大学 | Manufacturing method and device of light-focusing Fresnel lens |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809770A (en) * | 2012-08-07 | 2012-12-05 | 南京索尔玻璃科技有限公司 | Preparation method of linear Fresnel lens and Fresnel lens prepared by preparation method |
| CN105856597A (en) * | 2016-04-28 | 2016-08-17 | 芜湖利通新材料有限公司 | Calendaring process for manufacturing PVC (polyvinyl chloride) rubber cover |
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Application publication date: 20120222 |