B32B 25/08 - Produits stratifiés composés essentiellement de caoutchouc naturel ou synthétique comprenant du caoutchouc comme seul composant ou comme composant principal d'une couche adjacente à une autre couche d'une substance spécifique de résine synthétique
2.
OPENING AND CLOSING VALVE, SPOUT, AND LIQUID CONTAINER
Provided is an opening and closing valve which effectively prevents the entry of air. An opening and closing valve (9) is provided with: a cylindrical body (11); a lid (21) for opening and closing a hole (12) in the body (11); and a wall (13) protruding outward from an end surface (15) of the body (11) and surrounding the lid (21). The lid (21) protrudes, along the entire periphery thereof, from the end surface (15) of the body (11) and has a contact surface (22) coming into contact with an end of the hole (12). The curvature radius of a corner (R) of the end of the hole (12), the corner(R) coming into contact with the contact surface (22), is in the range of 0.01 mm to 0.50 mm, inclusive. The diameter of the outer surface (23) of the lid (21) is set to be larger than the diameter of the hole (12) in the body (11). The contact surface (22) is tilted relative to the surface of the hole (12).
The present invention increases tensile strength in the widthwise direction and lengthwise direction without a loss of air permeability. This perforated film (1) is provided with a plurality of holes (11), wherein each of the plurality of holes (11) is disposed at the intersection point of a plurality of virtual lines (VL1) extending along direction D1 and a plurality of virtual lines (VL2) extending along direction D2. Direction D1 differs from the widthwise direction and the lengthwise direction. Direction D1 and direction D2 preferably are each inclined at an angle greater than 30° and less than 60° with respect to the widthwise direction.
B26F 1/18 - Perforation par fentes, c.-à-d. en formant des entailles fermées à leurs extrémités sans enlèvement de matière
B26F 1/20 - Perforation par fentes, c.-à-d. en formant des entailles fermées à leurs extrémités sans enlèvement de matière avec des outils supportés par un tambour rotatif ou un support similaire
4.
CHECK VALVE, PRODUCTION METHOD THEREOF, AND CONTAINER PROVIDED WITH CHECK VALVE
Provided is a check valve capable of sufficiently suppressing the mixing of air in a container even if an impact is applied to the container, and capable of stably maintaining a superior discharging property of the content. A check valve (10) is integrally formed from a rubber material, and is provided with a cylindrical main body (1) having openings (1a, 1b) at opposite ends, a lid (3) arranged to close one opening (1a) of the main body (1), and a hinge (5) connecting the main body (1) and the lid (3), wherein the lid (3) comprises a projection (3a) on its side face (3b) so that the projection abuts the peripheral portion of the opening (1a) of the main body (1).
B65D 43/16 - Couvercles ou chapeaux inamovibles s'ouvrant à charnières vers le haut ou vers le bas
B65D 1/00 - Réceptacles rigides ou semi-rigides ayant des corps d'une seule pièce formés, p. ex. par coulage d'un matériau en métal, par moulage d'un matériau plastique, par soufflage d'un matériau vitreux, par coulage d'un matériau en céramique, par moulage d'un matériau fibreux cuit ou par étirage d'un matériau en feuille
B65D 1/02 - Bouteilles ou réceptacles similaires, à cols ou à ouvertures rétrécies analogues, conçus pour verser le contenu
B65D 25/42 - Tuyères ou goulottes formant corps ou fixées à demeure
B65D 25/46 - Tuyères ou goulottes articulées ou pivotantes
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