Resin bleeding

In the early stages of the cure cycle, the hydrostatic resin pressure should be equal to the applied autoclave pressure. As resin flow occurs, the resin pressure drops. If a laminate is severely overbled, then the resin pressure could drop low enough to allow void formation. Thus, the hydrostatic resin pressure is directly dependent on the amount of resin bleeding that occurs. As the amount of bleeding increases, the fiber volume increases, resulting in an increase in the load carrying capability of the fiber bed. 

Step 3 The Valve Is Now Opened Allowing Resin to Escape(e.g., Resin Bleeding). At This Point, However, the Resin Still Carries the entire 10 kg/cm2 Load. 

A practical consideration in using XAD-8 resin should be noted. Despite exhaustive cleaning of the resin before use, the resin bleeds on the order of 3 mg C/L in 0.1 N NaOH (5). A major component of the bleed is acrylic acid, which has a low capacity factor on XAD-8 at pH 2, and is separated to a large extent from the sample during successive reconcentration steps. However, a small amount of contamination from resin bleed may be present in the final product. 

Ion exchange resin Specific ionic interaction, high capacity, large volumes possible Resin bleed, limited regeneration, irreversible sorption possible... 

Many fectors must be taken into consideration in designing an adhesive. The requirements include low level of ionic impurities, no voids under the chip caused by evaporation of solvent or other volatiles, no resin bleed during cure, and thermal expansion properties that match those of the substrate and chip. A significant mismatch in the thermal expansion coeflScient can lead to development of thermal stresses that can result in cracking or distortion of the chip. This problem is becoming more and more important as die sizes continue to increase. 

Hopea parviflora Bedd. T WE Resin-Bleeding L- S, NL CSWG... 

The same set of alkyl halides used for N -alkylation was also found to be suitable for Nhalkylation, with the notable expansion to include other alkyl iodides beyond methyl and ethyl iodide. No evidence was found for C- or O-alkylation. Some resin bleeding , which is not uncommon in the use of PEG-derived solid supports, was reported. This refers to the presence of PEG fragments (released during strong acid treatments) in the crude samples. 

The moldability/1344 indicates the number of samples which, upon visual inspection, show flaws such as surface voids and rounded corners. Wire sweep and internal voids were determined by x-ray screening. These data may reflect a somewhat greater reactivity of the new molten resin. A further increase in resin viscosity may lead to wire sweep and other imperfections such as internal voids. A low resin bleed count supports this idea. (Resin bleed is resin material protruding onto leadframes beyond the rectangular shape of the resin mass). Linear devices were also molded over CuA leadframes at 175 and 150°C. The test yields were 98.0 and 98.8% respectively. These yields, as well as those obtained with A-42 leadframes (Table IV) are identical to the yeilds observed when commercial encapsulants are used. 

DAP finds application for the impregnation of ferrous and nonferrous castings because of its low viscosity, excellent sealing properties, low resin bleed out, and ease of cleanup. It is also used to impregnate wood to reduce water absorption and increase impact, compressive, and shear strengths. 

To solve these problems, a kneading process of previously adding a surfactant to a resin has been employed. According to the kneading process, the surfactant bleeds out from the inside to the surface of the resulting molded article to form a surfactant layer, and thereby exhibits performance such as antistatic properties and antifogging properties. These properties may sustain to some extent even when the surfactant at surface is wiped off, because the surfactant in the inside of the resin bleeds out again to thereby recover the properties. 

The infusion behavior is identical to standard VARTM processes where the vents are placed at the last location of fill. The membrane layer enables any point of the fabric surface to be connected to the vacuum port thus reducing the need for an optimized placement of the venting system. Nevertheless, the post-infusion behavior can be significantly different compared to standard VARTM processing. No resin bleeding occurs as the vent is placed on the impermeable membrane surface. Hence, the pressure behavior and consequently the overall thickness gradient and fiber volume... 

Filler 68-80 Decrease CTE Increase thermal conductivity Increase modulus Reduce resin bleed Reduce shrinkage Reduce residual stress Ground fused silica, alumina... 

Resin viscosity The flow behaviour of the resin is determined by the permeability of the fibre reinforcement and ancillary materials on the one hand, and the resin viscosity on the other hand. The latter is temperature-dependent, and will also change over time due to the beginning polymerization reaction. As a consequence, resin bleed and. 

Robinson MJ, Kosmatka JB. Resin bleeding simulation for the VARTM process, in SAMPE 2008, Long Beach, CA. 

The type of resist material used must meet the requirements for projser image transfer demanded by the printer and for stripping chemistry compatibility. From the metal etcher s point of view, the material needs to provide good adhesion and etch-solution resistance be free of pinholes, oil, or resin bleed-out and be readily removable without damage to substrate... 

---