33results about How to "Increased ring flexibility" patented technology

The invention relates to the field of pipes, in particular to a hollow-wall pipe and a manufacturing method thereof. The hollow-wall pipe comprises an inner layer, an outer layer and a hollow reinforcement layer, wherein the hollow reinforcement layer is formed by spirally winding a straight profile between the inner layer and the outer layer; the straight profile comprises a square single-wall corrugated pipe and a wrapping layer; four walls of the square single-wall corrugated pipe are of a corrugated structure with crests and troughs alternating in sequence in the axial direction; the crestpositions and the trough positions of the four walls of the square single-wall corrugated pipe correspond to one another; the junctions of the four walls of the square single-wall corrugated pipe adopt round corners for transition connection; and the junction of each crest and the corresponding trough adopts a round corner for transition connection. The pipe is not prone to deforming under external force and high temperature, has more excellent pressure resistant strength and damage resistance as well as high rigidity; and according to the manufacturing method, the fusion strength is high, the phenomenon that a cold-state winding pipe is extremely prone to fracture is avoided, operation is simple and convenient, the process is stable and pipes with ultrahigh diameters can be produced at will.

The invention discloses a PP corrugated pipe modified by ethylene propylene rubber (EPR). The PP corrugated pipe modified by the ethylene propylene rubber (EPR) comprises an outer wall pipe body and an inner wall pipe body, and the outer wall pipe body is composed of, by mass, 40-60 parts of polypropylene resin, 20-30 parts of nano calcium carbonate, 10-15 parts of ethylene propylene rubber (EPR) compound modifier, 1-3 parts of a colouring agent and 1-3 parts of a defoaming agent; the inner wall pipe body is composed of, by mass, 40-60 parts of polypropylene resin, 20-30 parts of nano calcium carbonate, 10-15 parts of ethylene propylene rubber (EPR) compound modifier, 1-3 parts of the colouring agent and 1-3 parts of the defoaming agent. By means of the PP corrugated pipe modified by the ethylene propylene rubber (EPR), low-temperature brittleness of the PP corrugated pipe can be lowered, toughness of an FRPP corrugated pipe in a low-temperature environment is improved, and non-notched impact strength, elongation at break and melt flowability of the PP corrugated pipe are all remarkably improved.

The invention relates to a HDPE hollow wall composite reinforced winding pipe, which comprises a hollow pipe wall and a reinforced skeleton, the reinforced skeleton is arranged in the hollow pipe wall, through holes are arranged on the outer wall of the hollow pipe wall, the top of the reinforced skeleton is flush with the outer wall, and the reinforced skeleton There is a gap between the top of the pipe and the outer walls on both sides; the hollow pipe wall is made of HDPE material, the reinforced skeleton is made of PVC material, and the outer surface of the hollow pipe wall is thermally covered with a layer of HDPE material. The invention also relates to a preparation method of a composite reinforced winding pipe, comprising the following steps: using an extruder to produce a PVC reinforced skeleton, extruding through twin-screws, shaping, cooling, and winding into rolls for use; using an extruder to produce HDPE hollow The strip is extruded by a single screw, shaped, cooled, and wound into a coil for use; the HDPE hollow strip and the PVC reinforced skeleton are wound and compounded on a molding machine, and a layer of HDPE material is hot-coated on the outer surface to form a composite reinforced winding pipe. The composite reinforced wound pipe has high ring stiffness and ring flexibility at the same time.

The invention provides a drainage blind pipe and an assembly thereof. The drainage blind pipe is of a multilayer structure composed of an anti-crystallization coating, an inner wall drainage layer, an outer wall structure layer and a filtering layer from inside to outside. The interiors of the drainage blind pipe are connected through the assembly. According to the provided drainage blind pipe of the four-layer structure, the anti-crystallization coating can effectively prevent calcium carbonate and other crystals from being attached to the pipe wall, and pipe crystallization plugging is prevented; the inner wall and the outer wall adopt materials with different components and ratios, the material formula of the inner wall can enable the pipe wall smoothness to be high, the drainage capacity is improved, in addition, the stability is high, the acid resistance and the corrosion resistance are higher, and the weather resistance is also greatly improved; crystal whiskers, various solid fillers and multiple additives are added into the formula of the outer wall, the ring stiffness, the ring flexibility and other mechanical properties of the pipe can be effectively improved, and the flame resistance of the pipe is also improved; and the filtering layer can effectively prevent silt and other particles from entering the pipe, so that pipe silting is prevented.

The invention discloses an underground double-layer reinforced and modified polyolefin (DRPO) corrugated pipe for water draining and sewage discharging. The pipe is formed by bonding an inner wall and an outer wall through hot melting, wherein the outer wall and the inner wall are both made of modified polyolefin materials. The modified polyolefin materials comprise, by weight, 50-75 parts of polyolefin, 5-10 parts of modified polyolefin elastomer (BPOE) and 20-40 parts of activated talcum powder. The DRPO corrugated pipe is mainly used for underground water draining and sewage discharging pipes.

The invention discloses a double-wall corrugated pipe modified by waste HDPE (high-density polyethylene) and a manufacturing process of the double-wall corrugated pipe. The double-wall corrugated pipe comprises an inner layer and an outer layer, wherein the inner layer is prepared from 100 parts of HDPE regenerated crumbles, 20-30 parts of LLDPE (linear high-density polyethylene) raw material, 80-110 parts of enhanced functional talcum powder, 4-5 parts of carbon black, 10-11 parts of defoaming agent, 4.5-9 parts of silane coupling agent, 0.45-0.7 parts of maleic anhydride grafted polymer and 2-3 parts of antioxidant; the outer layer is prepared from 100 parts of HDPE regenerated crumbles, 18-19 parts of HDPE raw material, 45-70 parts of LLDPE regenerated blow molded material, 110-130 parts of enhanced function talcum powder, 9-15 parts of ethylate-vinyl acetate copolymer, 5-6 parts of carbon black, 10-11 parts of defoaming agent, 5-9 parts of silane coupling agent, 0.5-0.7 part of maleic anhydride grafted polymer and 1.5-2 parts of antioxidant. The corresponding manufacturing method comprises the following step: mixing and granulating according to certain sequence by controlling temperature condition to manufacture a special inner layer material and a special outer layer material of the HDPE double-wall corrugated pipe. According to the manufacturing process, materials for producing the corrugated pipe are conveniently taken and can be put into production without adding other additives. The obtained double-wall corrugated pipe integrates hardness and softness, the annular flexibility is improved, the using performance is promoted, and the manufacturing cost is also reduced by using the waste HDPE.

The invention discloses a three-wall corrugated pipe and manufacturing equipment thereof. The pipe includes a pipe body, which includes a smooth inner wall layer, a corrugated intermediate layer and a smooth outer wall layer. The inner wall layer and the outer wall layer are closely connected with the crests or troughs of the intermediate layer, and the pipe body is provided with connection ports for mutual connection. Compared with prior arts, the inventive corrugated pipe has a smooth outer wall, which facilitates dragging and rolling during transportation and construction processes and avoids outer wall corrugation breakage and recess to further influence pipe use. Meanwhile, the outer wall layer is covered, in a molten state, on the outer wall of a double-wall corrugated pipe, which increases the pipe wave height and the moment of inertia to realize higher ring stiffness of the pipe and production of pipes with higher strength requirements on one hand, and increases the longitudinal bending strength of the pipe and improves the ring flexibility of the pipe on the other hand, thus realizing the purpose of the invention.

The invention relates to a polythene glass fiber winding structure wall tube stock which is composed of an inner wall layer and an outer wall layer. The inner wall layer is characterized in that a composite material strip formed by adding a glass fiber material strip between an upper flaky polyethylene strip and a lower flaky polyethylene strip winds a roller mold, and edges of the neighboring composite strips are sequentially mutually lapped to form a continuous solid wall tube; the outer wall layer is characterized by being formed by outer protruding reinforcing ribs formed by the fact that another glass fiber material strip covering between an outer tubular polyethylene strip and an inner tubular polyethylene strip winds the outer surface of the inner wall layer, and the outer protruding reinforcing ribs spirally strides a lapping fusion joint of edges of the neighboring composite strips of the inner wall layer. The tubular pitch height of the reinforcing ribs can be guaranteed by adopting the glass fiber strips, good alkali resistance, flexibility and tensile resistance in the longitude and latitude height are achieved by the aid of fiberglass mesh fabric, the weight of the product is reduced, raw material consumption is reduced, cost of the product is low, internal stress of the tube stock is greatly reduced, consumption is reduced, and ring stiffness, ring flexibility and crack resistance are improved.