Showing papers on "Blisters published in 1987"

Blow-Off Pressures for Adhering Layers.

Abstract: : An analysis is given of the critical internal pressure P at which a circular debond blister will grow in size, in terms of the tensile modulus E and thickness t of an adhering layer, and the strength G sub a of its adhesion to a rigid substrate. Measurements of blow-off pressure are reported for adhering layers of pressure-sensitive tapes having widely-different effective modulus and thickness, and with blisters having a range of diameters. Satisfactory agreement is obtained with the theoretical predictions, suggesting that the theory is basically correct in assuming that relatively thin layers behave like elastic membranes. Attention is drawn to the unusual form of the dependence of the debonding pressure P upon the resistance Et of the layer to stretching and upon the detachment energy . Even though the adhering layer is assumed to be linearly- elastic, the markedly non-linear (cubic)relation between pressure P and volume V of the blister, or maximum height y, leads to this unusual result. The detachment energy is given by a particularly simple function of the pressure P and maximum deflection of the blister: G sub a = 0.65 Py, independent of the stiffness of the adhering layer and diameter of the blister.

Blister packaging apparatus

Abstract: A blister packaging apparatus comprises a blister forming part (13) for forming a plurality of blisters (80) in a thermoplastic resin sheet (11), an automatic material supplying part (21) for automatically supplying materials into the blisters of the thermoplastic resin sheet, a metal foil member adhering part (23) for adhering a metal foil member (27) to the thermoplastic resin sheet so as to cover openings (28) of the blisters accommodating the materials, a half-cutting part (17, 31) comprising at least one circular blade (102, 126-1 - 126-8, 127-1 - ­127-8, 210, 215) which is fixed in a non-rotational state and has a blade (103) formed on an entire circumference thereof for forming a half-cut line (18, 32a, 32b) in the thermoplastic resin sheet for facilitating separation of the blisters, and a curl reforming part (35) for reforming a curl in the thermoplastic resin sheet on which the metal foil member is adhered.

PUVA-Induced Blisters, Complement Deposition, and Damage to the Dermoepidermal Junction

Abstract: • We followed the course of 56 patients receiving psoralen plus long-wave ultraviolet light (PUVA) therapy. Nonhemorrhagic blisters developed on clinically normal skin on the limbs of seven patients. Seeming to be related to friction and trauma, the blisters form as a result of damage to the basal and suprabasal layers. Perilesional skin specimens from all blistered patients contained granular deposits of C3 at the dermoepidermal junction, around the upper dermal blood vessels, or at both sites. The average time for initiation and complete formation of suction blisters was measured in 51 patients at different stages during the course of PUVA treatment. Blister separation was in the lamina lucida, with the pemphigoid antigen in the roof while the blister floor contained the lamina densa, laminin, and type IV collagen. This impaired dermoepidermal adhesion was a general phenomenon that occurred in all PUVA-treated patients. The mechanism remains to be determined. ( Arch Dermatol 1987;123:1471-1477)

The Causes of Boat Hull Blisters

Abstract: : This report is a highly-readable and condensed summary of the work undertaken to investigate the causes of blistering in fiberglass reinforced polyester composites, the structural material of many small boats, which are subject to blistering. The report is divided into the following sections: Introduction; How Blisters Form; the Hull Material; Manufacturing Processes; Water Diffusion in Hull Materials; Stresses in Hull Materials; Testing for Blister Resistance; Types of Blisters; Leaching of Substances from Hull Material; Long Term Effects of Water Up-Take. Keywords: Blisters, Boat fiberglass.

Burn blisters should be left alone.

Abstract: The management of blisters caused by minor burns remains controversial. To determine the risk of infection and the effect on pain, Swain and colleagues

Time-dependent appearance of l tb4 in human burn blisters

Abstract: Burn blisters are containing LT. The level of content is difficult to be explained: immediate or delayed cold water treatment (CWT) and time interval (few minutes, hours or days) modify the measurable content of LT.

Time-Dependent Appearance of LTB4 in Human Burn Blisters

Abstract: Burn blisters are containing LT. The level of content is difficult to be explained: immediate or delayed cold water treatment (CWT) and time interval (few minutes, hours or days) modify the measurable content of LT.