22.01.2016
After 2 layers of the epoxy, curing in the sunlight for about 15 minutes each time, I love the finished piece – air bubble free, beautifully domed and crystal clear. Bubbles usually happen if there is a gap between your piece and a bezel, where air can get trapped and slowly rise to the surface, or through a chemical reaction due to product incompatibility. This paper presents UV imprinting methods for fabricating a high-aspect-ratio pillar array.
Because the cost of a PDMS mold, it could be used for UV imprinting over 10 times without remarkable pattern deformation. Economic attractiveness due to low costs of the raw materials and the coating technology, and high production speed even at high coating weights. The acResin® UV products consist of acrylic copolymers that include copolymerized photo-reactive groups. The chemical principle of acResin UV is basically different from other types of UV acrylics. To achieve an efficient crosslinking of the acResin UV molecules, UV light with a special wavelength band is needed since the UV light has to match the UV absorption of the photo-reactive groups in acResin UV.
A special feature of acResin UV is that the adhesive properties can be tailored by adjusting the UV C-dose to which the coated adhesive is exposed. Besides the fact that a whole range of different products can be produced from one raw material by adjusting the UV dose, acResin UV offers many other advantages.
The Handbook of Sealant Technology provides an in-depth examination of sealants, reviewing their historical developments and fundamentals, adhesion theories and properties, and today’s wide range of applications. Learn more about products detailed description, pricing and service, Please send mail to us! For most application the Ultra Violet or visible light curing  method is by far superior and much faster to any other rapid modeling methods. The software interface (see link below) starts  the process by slicing a 3d CAD drawing into thousands of horizontal sliced layers and generate a photo image for each  cross section in a seqential order. This process continous until the whole model (green) is extruded from the resin vat.The model is build upside down, as it extrudes from the base first.
A highly  detailed model (high resolution) of 2 inches high (50mm) usually consist of thousands of layers.
Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm. Certain products have to be sent on a Hazchem carrier which means someone MUST be available to sign for them.These goods CANNOT be left without a signature.
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The roll press method includes (a), (b), (c), (d) and (e), and the batch press method includes (a), (f), (g) and (e). As shown in Figure 4a, five points in the pattern area were measured: point #1 was at the center, while points #2–4 were about 5 mm inside the edge of the pattern area. Results and DiscussionFigure 5 shows a photograph and SIM image of a sample imprinted by the roll press method. When used more than 10 times, the PDMS was often partially peeled away from the PET during demolding.
The preferred type of polymer raw material for these adhesive systems is the acrylics because they guarantee an excellent aging behavior and an optimum visual appearance.
Also, only slow production speeds are possible for both of the alternatives, especially at high coating weights, due to the necessary evaporation of organic solvent or water.
In this temperature range, acResin UV becomes liquid enough to be coatable with common slot-die or roll systems (Fig.
A closer look at the crosslinking mechanism of acResin UV reveals that the concentration of the triplet radical T1 in the carbonylic function of the benzophenone group is responsible for the resulting crosslinking efficiency.
Labels coated with such a product show excellent peel values and can be removed after use from a wide variety of different surfaces without leaving any visible residues. Needless to say that the whole process is  computer controlled and can take up many hours to build a small 2 inch model.
The pillar pattern was formed on a 50 ? 50 mm2 area on a polyethylene terephthalate (PET) film without remarkable deformation. The PDMS film at the border between the unpeeled and peeled portions was subject to irreversible stretching or tearing during the next demolding process.


To produce an adhesive with substantial cohesion, the coated acResin raw material has to obtain a much higher molecular weight. Such mixtures react after being coated onto the carrier in a radical polymerization of double bonds. Hence, the higher the T1 radical concentration, the more the photo-reactive groups will react and the higher the resulting crosslinking density will be (Fig. This is a consequence of the crosslinking density and makes it possible to produce a whole range of different products from one raw material just by modifying the UV C-dose.
The last sliced image wil be small again.  Each image is used to seqentially build  a one layered cross section at a time. A projector projects the first image sliced (cross section #1)  of the 3d CAD drawing in white light (or uv) through the glass onto the building platform surface for about 8 seconds.
These methods include deep-reactive ion etching (DRIE) [1,2], X-ray lithography [3,4,5], UV lithography [6,7,8,9] and laser abrasion [10,11]. At each measurement point, two base points, the center of the straight groove (?) and the center of the cross-junction of the groove (?) were selected (Figure 4b).The residual layer thickness (RLT) of the imprinted sample was measured from the scanning ion microscopic (SIM) image.
Thus, an improvement in the adhesion strength between the PDMS and the PET will be required for further multiple uses, which is important for cost reduction.
However, disadvantages such as unpleasant odor and toxicity risks arising from residues of monomers and the photoinitiator, low coating speed, and the fact that nitrogen gas is necessary to inert the system have restricted the market success of this type of system so far.
Standard mercury, medium-pressure bulbs commonly used in other applications are typically used as the light source.Fig.
For example, acResin DS 3532 is an adhesive raw material that is well suited for two completely different applications.
This article is based on a presentation made at the 24th Annual Meeting of the Adhesion Society in Williamsburg, Va., Feb.
Even though this method uses resin for every layer buildup it is not mechanically applied at every layered  level. As the thin sandwiched layer of resin between between the glass and the building surface recieves  the light, it cures to a plastic consistency(polymerize). The mold was placed into contact with a UV-curable resin under a reduced pressure, and the resin was cured by UV light irradiation after exposure to atmospheric pressure.
Because these fabrication methods provide low-throughput and are not cost-effective, successive molding technologies, such as injection molding, hot embossing and UV imprinting [3,7,8,9,12,13,14,15,16,17,18,19,20,21,22,23] are required for mass production. Next, the master was treated with an anti-sticking agent (Optool HD-1101Z, Daikin Industries, Ltd., Osaka, Japan). This SIM image was obtained by using a focused ion beam system (FB-2100, Hitachi High-Technologies Co., Tokyo, Japan).
The height based at point ? (h?) was different from that at point ? (h?), because of a microloading effect during DRIE [2,24]. Examples of alternatives include the sol-gel method [27] and a method that does not use a base film. Under the action of UV light, the photo-reactive groups in acResin UV crosslink the acrylic polymer backbone molecules by a chemical-grafting reaction (Fig. When crosslinked with a low UV dose, acResin DS 3532 is a good adhesive for deep-freeze labels, whereas when it is crosslinked with high UV doses, it produces an excellent adhesive for removable labels.
Becaus it is a liquid at low viscosity ,it uses gravity to fill the building  gap for the next layer of curing.
Any type of model can be build with it with no limitations to undercuts ,hollow structures or curvature.
This first layer is importand ,It forms the base of our model wich is now glued to the building platform surface. However, molding high-aspect-ratio structures is challenging, because it is difficult to successfully demold the structure.The fabricated master is often replicated in another material, and the replicated sample is used as a mold. The PET was placed manually on the center of a stage in the chamber to lay the pattern area of PDMS mold on the resin-coated area during the next process.
The heights for the imprinted samples were 1–2 µm higher than those for the silicon master, while the gaps and pitches showed little difference. Figure 8 shows cross-sectional SIM images of samples imprinted at various applied forces (F1). In the latter case, the PDMS film would need to be thicker from the viewpoint of morphological stability and handling ability. 4: UV Emission of a Standard UV LampOnly UV irradiation in the UV C-band between 220 nm and 280 nm is decisive for the formation of the triplet radicals T1. It builds a model in a 3 dimensional  hard durable  solid layered  format in resin ,rubber or wax.
By moderately pressing the mold before UV-curing, the thickness of the residual layer of the imprinted resin was reduced and the pattern was precisely imprinted.
The PDMS mold was fixed to a motor that could have its vertical movement controlled from outside the chamber. In the case of a sample fabricated by the roll press method, the uniformity of the RLT within a sample was also measured. This suggests that a PDMS or UV-curable resin pattern elongates during the demolding (from the silicon master in the case of PDMS and from the PDMS master in the case of UV-curable resin).Figure 6 shows SIM images of samples molded without evacuation in Figure 3b. Therefore, only the UV emission peaks in this range contribute to the crosslinking of acResin UV.


Generally, because the master is entirely etched after the electroplating process, only one nickel mold can be obtained from a master. After degassing in a vacuum chamber, the mixture was poured onto the master and degassed again. After evacuating the chamber to a chamber pressure of about 200 Pa, the mold was placed into contact with the UV-curable resin (Figure 3b). The location from the edge of the pattern area (x) was defined as shown in Figure 4c, and 20 points (x = 6–46) were measured. The thicker (t1) and thinner (t2) RLTs correspond to the points at ? and near ? in Figure 4b, respectively. Common medium-pressure mercury-vapor lamps emit UV irradiation with the correct wavelengths and therefore are well suited for this application (Fig. Although the glass transition temperature of the polymer is very low (-75°F), the crosslinking level is already high enough to produce cohesion of the adhesive sufficient enough to cut and stamp laminate rolls without any edge-bleeding problems (Fig. On the other hand, polymer replica molds are more cost-effective, because it is expected that polymer materials can be used to replicate a master or a nickel mold many times. Then, the mold with the resin and PET substrate was taken out of the chamber and was pressed by rotating a roll from above (Figure 3c).
This result indicates that filling the mold with resin under a reduced pressure was easier than under atmospheric pressure. Critical tasks in high aspect ratio silicon dry etching for microelectromechanical systems. The polymer materials include polydimethylsiloxane (PDMS) [9,16,17], photocurable polymers [15,16,20,22] and thermoplastics [18,19,21]. The force applied to the mold by rotating the roll was about 14 N, which corresponds to the weight of the roll. The meniscus geometry in Figure 6 suggests that a higher applied force was required to fill the mold with resin, which caused deformation of the PDMS mold structure.On the other hand, the generation of bubbles in the uncured resin was grossly observed during the pressing of the mold and resin under the reduced pressure (Figure 3b). After curing at 80 °C for 1 h, the PDMS and PET were peeled off the master and baked again at 80 °C for 1 h. After opening a leak valve in the chamber to expose it to atmospheric pressure, the generated bubbles decreased. In addition, a flexible polymer mold is expected to be applied to a roll-to-roll or roll-to-sheet process, which is suitable for mass production [19,22,23].In this study, UV imprinting methods for the fabrication of a high-aspect-ratio pillar array were demonstrated.
Finally, the mold was peeled off manually along a roll with a diameter of 60 mm (Figure 3e). These phenomena seem to have originated with the outgassing and gas absorption characteristics of PDMS.
Thus, when the UV-curing was successively carried out under the reduced pressure (Figure 3g), an unfilled pattern region like that shown in Figure 6 was also often observed. PDMS was selected for the mold, because of its good mold releasability and high flexibility. To evaluate the applied force effects, the batch press method, which is described below, was also examined. A filled pattern like that shown in Figure 5 was obtained over the pattern area when UV was irradiated after exposure to atmospheric pressure (Figure 3d,g). The following sections explain our experimental methodology, present and discuss our results and provide a conclusion. The value of t2 also included a variation based on the sectional location, with a thicker t2 found for a sectional location closer to the pillar.
Fabrication of microstructures with high aspect ratios and great structural heights by synchrotron radiation lithography, galvanoforming, and plastic moulding (LIGA Process). However, at least the residual layer corresponding to the difference between t1 and t2 (=6.5 µm) will remain, even if a higher force is applied in the roll press method. After this, the resin was cured by irradiating UV light into the chamber while pressing the mold at force F2 (Figure 3g). From this point of view, other master fabrication methods, such as X-ray lithography [3,4,5] and UV lithography [6,7,8,9], would be more appropriate than the DRIE method.These results indicate that both the batch and roll press methods are available for fabricating this pillar array. For application to larger pattern areas, it is expected that the roll press process would be more appropriate than the batch process in terms of pressure uniformity [25,26]. In the roll press method, several independent product lines corresponding to Figure 3 will be required for mass production.
Applications of LIGA technology to precision manufacturing of high-aspect-ratio micro-components and -systems: A review. A new UV lithography photoresist based on composite of EPON resins 165 and 154 for fabrication of high-aspect-ratio microstructures.
Fabrication of high aspect-ratio polymer microstructures for large-area electronic portal X-ray imagers. Fabrication of elastomeric high-aspect-ratio microstructures using polydimethylsiloxane (PDMS) double casting technique.
Laser fabrication of high aspect ratio thin holes on biodegradable polymer and its application to a microneedle.



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