Please select the most similar patent number from A, B, C and D. Which number is?
A production process for making wigs by using a three-layer hair net, comprising the following steps: firstly, selecting a three-layer hair net, wherein the middle layer and the surface layer are both lace nets densely covered in hexagonal holes; dislocating and fixedly sewing the lace nets of the middle layer and the surface layer which are densely covered in hexagonal holes into a whole body by using a lockstitch sewing machine; nailing the same to a wig head mold, weaving the wig hairline onto the middle layer using a crochet by means of a process for weaving wigs, exposing the wig hairline below the middle layer, and braiding the hair in the middle layer; and then finally, stitching or braiding the bottom layer onto the middle layer. With the described process, the operation is easy and labor costs are reduced; furthermore, the resulting wig is more aesthetically pleasing, and the air permeability is better.
A: A hairpiece product and a making process therefor. By designing of a single-sided hot melt adhesive membrane (2), a hairline layer (1), a double-sided hot melt adhesive membrane (3), and a support layer (4), the fixing stability of the hairline layer (1) is improved, and meanwhile a brand new production material and process are adopted, so that a production period is shortened, and the production efficiency is improved; a consumer can get comfortable wearing experience at a relatively low cost; and the involved production material is an environment-friendly non-toxic material, and is harmless to the environment and operation workers. The hairpiece product comprises the hairline layer (1), the single-sided hot melt adhesive membrane (2), the double-sided hot melt adhesive membrane (3), and the support layer (4), wherein the single-sided hot melt adhesive membrane (2) is provided on one side of the hairline layer (1); the double-sided hot melt adhesive membrane (3) is provided on the other side of the hairline layer (1), and is provided on an outer surface of the support layer (4); and an inner side of the support layer (4) is used for being detachably mounted on the head of a human body.
B: Disclosed is an environmentally friendly anti-slip, self-skinning improved matting, composed of a PU self-skinning layer, an intermediate layer, glue and an anti-slip layer, wherein the intermediate layer is of the same material as or of a similar material to the PU self-skinning layer and is a thin layer foamed and fixed by casting in a mould; the top surface of the anti-slip layer is bonded to the intermediate layer by means of glue; rivet holes are provided in the bonded intermediate layer and anti-slip layer; the PU self-skinning layer is foamed and formed on the top surface of the intermediate layer, making the lower surface of the PU self-skinning layer and the top surface of the intermediate layer foamed and fixed together by casting in a mould; and the lower surface of the PU self-skinning layer also passes through the rivet holes and protrudes out of the lower surface of the anti-slip layer to expand and form rivets, forming a self-riveting fit by virtue of the rivets and rivet holes, further fixing and combining together the PU self-skinning layer and the anti-slip layer.
C: Provided is a manufacturing method for a compound pot, wherein, the compound pot comprises an inner layer, an intermediate layer and an outer layer, the manufacturing method comprises: step S1, making a groove for accommodating a sensor on the intermediate layer; step S2, laying the sensor between the inner layer and the intermediate layer, and/or laying the sensor between the intermediate layer and the outer layer, the position of the sensor corresponds to the position of the groove, then compounding the intermediate layer with the sensor, the inner layer and the outer layer together by pressure welding, the temperature measurement of the compound pot is more accurate.
D: A microfluidic chip consisting of a PDMS top layer, a PDMS intermediate layer, a PDMS bottom layer, and a glass substrate. The PDMS top layer, the PDMS intermediate layer, and the PDMS bottom layer are all provided with a groove at the front-middle portion of their respective lower surfaces. When the PDMS top layer, the PDMS intermediate layer, the PDMS bottom layer, and the glass substrate are sequentially aligned and bonded, three layers of flow paths, namely a top layer flow path, an intermediate layer flow path, and a bottom layer flow path, are formed respectively by the groove of the PDMS top layer and the PDMS intermediate layer, by the groove of the PDMS intermediate layer and the PDMS bottom layer, and by the groove of the PDMS bottom layer and the glass substrate. Three fluid inlets respectively in communication with the top layer flow path, the intermediate layer flow path, and the bottom layer flow path are sequentially arranged on the upper surface of the PDMS top layer on the basis of the positional order of the three layers of flow paths, namely the top layer flow path, the intermediate layer flow path, and the bottom layer flow path, while 10 to 1000 fluid outlets are arranged at the end of each layer of flow path. The present invention employs a scheme of multiple paths in parallel and fluid envelopment at the fluid outlets to achieve uniformity control of a product, and to prevent the product from being clogged within the flow paths.
Answer: A