Equipment and method for producing reflective film with microprism structure by extrusion method

A technology of microprism and reflective film, which is applied in the field of production of microprism structure reflective film by extrusion method, which can solve the problem of inability to ensure that the splicing seam is absolutely flat and flawless, and the overall uniformity of the thickness of the large-area electroformed nickel plate is completely consistent, etc. problems, to achieve the effect of ensuring service life, increasing material temperature and protecting service life

Inactive Publication Date: 2016-08-24
田武学 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent with the publication number CN1756648A sets the temperature of the die belt at about 200°C, it adopts the process of directly coating the ring-shaped die belt on the roller by the extrusion die lip, and the extrusion die head and the corresponding heating roller Strict requirements are put forward for the processing accuracy of the cylinder and the ring mold belt. In particular, the ring mold belt is made by a combination of splicing and electroforming. The overall uniformity of the thickness of the plate is completely consistent; during the operation of the annular nickel belt, due to asynchronous heating and cooling, a certain amount of distortion will occur, and in addition to the thermal expansion and extrusion of the relevant parts, the die lip and the annular nickel belt must be maintained evenly. Desired small gap, almost impossible task

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  • Equipment and method for producing reflective film with microprism structure by extrusion method

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Experimental program
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Effect test

Embodiment 1

[0025] Extrusion method of the present invention produces the equipment of microprism structure reflective film, as figure 1 Shown, its technical scheme is:

[0026] 1) The ring-shaped mold belt 8 runs clockwise around the heating roller 1 and the cooling roller 2. The two rollers are placed flat and have a certain tension between them to ensure that the ring-shaped mold belt 8 is tensioned without damage;

[0027] 2) On the right side of the heating roller 1 are the silicone roller 3 and the metal roller 4 attached to the high-temperature fiber belt 13, and the silicone roller 3 is pressed against the heating roller 1 through the cylinder pressure;

[0028] 3) A far-infrared heating device 12 is set above the left side molding entrance A of the fiber strip 13, which plays a role of heat preservation and warming, so as to ensure that the plastic melt has a sufficient temperature before molding;

[0029] 4) Above the metal roller 4 is the extrusion die 7, the die lip of the ex...

Embodiment 2

[0036] The preparation method of embodiment 2 microprism structure reflective film

[0037] (1) extrusion coating

[0038] The polycarbonate resin with a melt index greater than 20 / g (10min) and a melt viscosity less than 800 Pa*s is extruded on the high temperature resistant fiber tape 13 wrapped with a metal roller 4 through the extrusion die 7 without stretching, and extruded The extrusion temperature of the die head 7 was 285°C, and the temperature of the metal roll 4 was 300°C.

[0039] The non-stretch extrusion coating means that the gap between the die lip and the fiber tape 13 wrapped on the metal roller 4 is equal to the thickness of the film, so that the plastic melt flowing out of the die lip is extruded onto the fiber tape 13 . For example, by controlling the extrusion amount of the melt in the extrusion die and the running speed of the heating roller 1, the thickness of the melt film is controlled at 80-150 microns, preferably 100 microns, and the distance betwee...

Embodiment 3

[0050] In the following embodiments, the average value of the retroreflection coefficient of the annular mold belt 8 surface at an observation angle of 0.2° and an incident angle of -4° is 830mcd / lx / m2, and the maximum value of the retroreflection coefficient is 920mcd / lx / m2, and the retroreflection coefficient is the largest The value is 750mcd / lx / m2.

[0051] (1) according to the scheme of embodiment 2, be that 22 / g (10min) anti-ultraviolet grade polycarbonate resin is pressed into thickness by extrusion molding by the scheme of embodiment 2 and be 150 microns, width is the resin film of 1.25 meters band microprism forming layer , compounded with BOPET film at the pressing point C, the polyester film plays a role of polishing and protection, and can be finally peeled off. The obtained reflective film was measured at 20 points, and the retroreflection coefficient was tested by a retroreflection coefficient detector with an observation angle of 0.2° and an incident angle of -4...

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Abstract

The invention discloses a device and a method for producing a reflective film with a microprism structure by an extrusion method. The present invention adopts a special extrusion coating process to extrude and coat transparent thermoplastic resin on the high-temperature-resistant fiber tape attached to the metal roller through the hot extrusion die head without stretching, and through the pressure and rolling of the roller and the roller, The plastic melt is extruded and flowed in the mold belt, thereby filling each sunken microprism unit to achieve the purpose of molding replication, and then enters the cooling zone for cooling and peeling. The equipment of the invention is easy to manufacture, and the mold belt has a long service life; the reflective film produced by it has high retroreflection coefficient, uniform brightness and good weather resistance.

Description

technical field [0001] The invention relates to the technical field of nano-imprint molding of optical microstructures, in particular to an equipment and method for producing reflective films with microprism structures by extrusion. Background technique [0002] It is a foregone conclusion that the micro-prism type reflective material can be used to upgrade or even replace the traditional glass bead type reflective material due to its super comprehensive performance. The new national standard for road reflective signs has been promulgated and implemented in June 2013. The new GB / T18833-2012 national standard strengthens the status of micro-prism reflective film as a high-grade reflective material, and limits the scope of use of glass bead reflective material. At present, the micro-prism type reflective film is mainly produced in the United States, Japan and other countries, and the domestic research and development progress is not optimistic. [0003] Although the retroref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01B29C47/88B29C48/08B29C48/91
CPCB29C48/08B29C48/91B29C48/914
Inventor 田武学丁少贤
Owner 田武学
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