FRP pultruded profile cracks, including appearance and inner crack. It can appear in any goods and any moment.The reason is mainly because of the crack onset exothermic shorter episodes of heat stress. There are many manufacturers also agreed on this point. But at present domestic but also difficult to find a better way to eliminate thermal stress. Although the appropriate adjustment of mould temperature and pulling speed can temporarily gentle this question, but as environmental conditions change and some unknown reason, the crack will reappear. Cracks sometimes suddenly appear in a very normal circumstances would make you impossible to guard against. Just add a few (the amount of resin 2%-5%), that have a significant effect. Because the amount is not added, the influence on thefunctionality of the product is very small, to enhance the effect of certain function can. In addition to reduce cracking, it also has to add product appearance luster, make the finished color more uniform strengths. In this component in the formulation, can reduce thereject rate to a great extent, make the production more smoothly. DP anti crackingbrightening powder to avoid cracking mechanism of finished products as follows: because itdoes not dissolve in the resin, so when it is slack in the resin, resin composition insuccessive phase size is about lax chondrules 50 - 100 m, in these chondrules and lax in a liquid resin minority. When the resin is heated, the successive phases and phase are to attack the swell and lax. In the heat to 120-140%, the crosslinked resin curing and shorten the beginning episodes, resin and lax phase chondrules within also attack curing. But nowthe slack phase pellets still follow the temperature increases continue to swell. Thus in theslack phase chondrules and one phase at the interface of a stress and strain. As the temperature continues to rise, the successive phase crosslinking continue to attack and tends to end, along with the successive phase to shorten this process. So at the interface of a stress and strain more. When the stress and strain to a certain level, slack phasespherules within the crosslinked resin network attack the micro crack and expansion in the chondrules within, so that the stress and strain in jail at the interface. Through such amechanism, to avoid the crack appears successively finished main skeleton network.
Source: www.unicomposite.com
2015年2月25日星期三
2015年2月19日星期四
CRTM (Continuous Resin Transfer Molding Pultrusion Process)
Continuous Resin Transfer Molding Pultrusion Process is developed in late of 1970. Glass fiber goes through yarn guide and pre forming system into a continuous resin transfer mould to stabilize the pressure and flow rate, injection of special resin, glass fiber to fully soak and remove air bubbles, curing mold fully infiltrated and bubble free glass fiber into the mold in the traction machine under the inside, so as to realize the continuous resin transfer molding (Continuous Resin Transfer Molding Pultrusion Process CRTM) orinjection pultrusion. This method is not used in the raw materials of polymer, but two or more than two kinds of liquid monomer or prepolymer, in certain proportion respectively added to the mixing head, evenly mixed under pressure, immediately injected into theclosed mold, curing in the mold, forming products. Due to the materials used are liquid, withsmaller pressure that can quickly fill the die cavity, and therefore reduces the clamping force and the mold cost, is particularly suitable for the production of large area articles.Reaction injection molding required components by mixed, immediately quick reaction, and the material can be cured to release degree. Therefore, to use special materials and formulations, sometimes products also need heat treatment to improve its performance.The key to forming equipment is the design of the structure, mixing head componentsaccurately measure and transport. In addition, the raw material storage tank and mold temperature control is also very important.
Continuous resin transfer molding pultrusion process has the following advantages:
1. Glass fiber fully saturated, FRP products in the production will have little micro bubble content and excellent electrical properties;
2. For the resin system and the atmosphere easy isolation, performance of the product is not easy to be influenced by the environment;
3. Resin for injection maintains the same characteristics;
4. Easy to get transparent products, the product defects (such as inclusion, knotyarn) are easy to find and eliminate.
Source: www.unicomposite.com
2015年2月14日星期六
Fiberglass Pultruded Profile Samples With Peel Ply
Our factory has tested two kinds of profiles with peel ply. We use peel ply with the highest heating temperature 220℃. The 1st one is fiberglass pultruded u profile peel ply off and it's painted directly, the 2nd sample is frp u profile peel ply off but with puttying before painting. Test result is: there are peel ply stripes on the surface of the 1st fiberglass u profile sample, but the surface finish of the 2nd sample with puttying before painting process looks much smooth and noble.
Source: www.unicomposite.com
Source: www.unicomposite.com
2015年2月10日星期二
2015年2月6日星期五
Unicomposite Carbon Fiber Tubes
Composite carbon fiber tubes include pultrusion process and roller, our engineer will choose the most suitable production technology. Please click www.unicomposite.com to get more details.
.jpg)
.jpg)
订阅：
博文 (Atom)