Abstract: A heat exchange assembly and a heat exchange system. The heat exchange assembly includes a first tube, a first member, and a retaining member. The first tube includes a first circumferential wall and a first chamber, and at least part of the first member is located in the first chamber and has a length in a length direction of the first tube. A part of the retaining member is located in the first chamber; the retaining member includes a first hole channel that runs through the retaining member, and at least part of the first member is located in the first hole channel.

Abstract: This disclosure relates to a process which involves reacting 2-butanone with acetaldehyde in the presence of a zinc complex catalyst in a reaction zone to produce a product mixture comprising 4-hexen-3-one and 3-methyl-3-penten-2-one. This disclosure also relates to a process which involves (a) reacting 2-butanone with acetaldehyde in the presence of a zinc complex catalyst to produce a product mixture comprising 4-hexen-3-one, 3-methyl-3-penten-2-one and the zinc complex catalyst; (b) recovering the zinc complex catalyst from the product mixture; and (c) reusing the recovered zinc complex catalyst in the reacting step (a).

Abstract: A process of manufacturing a PEAK racket includes the steps of taking a substrate layer, where the substrate layer is adapted to a PEAK racket; cutting a first filling space at a middle of the substrate layer, and filling a low-density material in the first filling space; cutting a second filling space at an upper side of the substrate layer, and filling a high-density material in the second filling space; respectively attaching and fastening a panel on each of two surfaces of the substrate layer, to obtain a semi-finished product; and drilling at a middle of the semi-finished product to form a plurality of through holes that are used for reducing wind resistance, wherein each through hole runs through outer side surfaces of the two panels. There is further provided the step of wrapping an edge of the racket, and mounting a handle.

Abstract: The present disclosure provides a covering for a PEAK racket. The covering for a PEAK racket is applied to a PEAK racket, and includes a covering body. The PEAK racket includes a panel, and the covering body is detachably attached and fastened to a surface of the panel. A corresponding covering body may be attached to the PEAK racket as required by detachably attaching the covering body to the surface of the panel. If a user selects a frosted PEAK racket user does not need to buy a separate PEAK racket, provided that the user only needs to attach the covering body to the PEAK racket. This is convenient and fast. In addition, costs are low. The covering body is attached to the protect the PEAK racket, so that the PEAK racket is protected better. The spin may be given through the frosted surface. This increases enjoyment.

Abstract: The present disclosure discloses a handle protection case for a PEAK racket. The handle protection case includes a main body. A Velcro brand is attached and fastened to an inner side surface of the main body, and the main body is adhered and fastened to an outer surface of the handle with the Velcro brand. Because the Velcro brand is attached and fastened to the inner side surface of the main body, the main body is adhered and fastened to the outer surface of the handle with the Velcro brand. This protects a structure of the handle well, and avoids the handle from aging. The product is convenient to use, removable, washable, resistant to dirt, durable, easy to carry, and easy to replace, so that the product is worthy of widespread use.

Abstract: A pickleball racket is provided with cloth or leather and includes a body composed of a base material layer and two panels. The panels are respectively superimposed on both surfaces of the base material layer. An outer peripheral surface of the body is wrapped with a plastic strip as an edge. The body includes a racket body and a handle integrally connected to the racket body. An outer surface of each panel is covered with cloth or leather as a frameless edge. The frameless edge can be wrapped with the leather or the cloth. The cloth or the leather is located on an outer surface of the racket body. By covering the outer surfaces of the two panels with the cloth or the leather, the cloth or the leather is located on the outer surface of the racket body.

Abstract: A method for wrapping an edge of a PEAK racket by injection molding is provided. The method includes the steps of manufacturing and preparing a preliminary embryo of a racket, where the preliminary embryo of the racket includes a racket body and a handle that is integrally connected to the racket body; mounting a racket mold on an injection molding machine, and placing the preliminary embryo of the racket into the racket mold; placing plastic particles into the injection molding machine, to melt the plastic particles in a liquid form, where the liquid plastic flows into the racket mold and is combined with a peripheral side surface of the preliminary embryo of the racket, to form a wrapped edge; and after cooling, wrapping the wrapped edge, and fastening the wrapped edge to the peripheral side surface of the preliminary embryo of the racket to form a finished product.

Abstract: A pickleball paddle includes a body. The body includes a substrate layer and two panels, the two panels are respectively stacked on two surfaces of the substrate layer, and a peripheral side surface of the body is banded with a plastic strip as a whole, to 5 enable an edge of the plastic strip to be flush with an outer surface of the panel. The body is further provided with a racket body and a handle that is integrally connected to the racket body. A reinforcing board is covered on and fastened to an upper surface and a lower surface of the handle. Foam cotton is attached to an outer surface of each reinforcing board. An anti-slip band is attached to an outer surface of the foam cotton.

Abstract: An aluminium alloy including 1.0-1.5 wt % Mn, up to 0.1 wt % Mg, up to 0.3 wt % Si, up to 0.3 wt % Fe, up to 0.1 wt % Cu, up to 0.25 wt % Cr, up to 0.1 wt % Ni, up to 0.3 wt % Zn, up to 0.1% Ti, up to 0.2 Zr. The allow also includes impurities, each no more than 0.05 wt. % and wherein the total of impurities is no more than 0.15 wt. %, with the balance being aluminum.

Abstract: An aqueous coating composition having acceptable heat-age stability and providing the resultant coating film with good washability.

Abstract: An aqueous coating composition having acceptable heat-age stability and providing the resultant coating film with good washability.