What should be paid attention to when making PVC pipe fittings?

 

What should be paid attention to when making PVC pipe fittings?

1. Temperature control of PVC pipe fittings

PVC pipe fitting temperature control is an important control factor in extrusion operation. The control factors of extrusion molding are barrel temperature, diameter temperature and die temperature. Low temperature, poor plasticization, dull appearance of PVC pipe fittings, poor mechanical properties, poor product quality, high temperature, material decomposition, product discoloration.

2. Screw speed of PVC pipe fittings

With the increase of screw speed and extrusion amount, the output can increase, but it is easy to produce the phenomenon of poor plasticization, which leads to the rough inner wall of PVC pipe fitting and the decrease of strength. At this time, the die pressure should be adjusted to obtain good output and quality. The temperature control of screw affects the conveying speed, plasticizing and melting quality of materials.

3. Traction speed of PVC pipe fittings

In the re extrusion operation, it is very important to adjust the traction speed. After extrusion, melting and plasticization, the material is continuously extruded from the mold, and then pulled into the setting device, cooling device, traction device, etc.

4. Compressed air and pressure

The compressed air of PVC pipe fitting can make PVC pipe fitting expand and keep the roundness of pipe to a certain extent. The pressure should be appropriate. If the pressure is too low, the pipe is not round, if the pressure is too high, the mandrel is cooled, the inner wall of the pipe is cracked and not smooth, and the quality of the pipe is reduced. At the same time, the pressure should be stable, for example, the pressure fluctuation is large, and the pipe is easy to produce slub.

5. Temperature of sizing device and cooling device for PVC pipe fittings

Different plastic products are extruded by different sizing methods and cooling methods. The cooling medium can be air, water or other liquid, and the temperature needs to be controlled, which is mainly related to the production efficiency and the internal stress of the product.

The above five points are about the matters needing attention in the production process of PVC pipe fittings. I hope the content of this article can arouse everyone’s attention.

We can produce various standards and various types of pvc pipe fittings,Welcome to consult.

email:david@pvcpipefitting.com

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How to solve the yellowing of PVC pipes

 How to solve the yellowing of PVC pipes

The main reason for the yellowing of PVC pipes is that the amount of stabilizer is not enough or the grade is not good, and there should be redness. It is possible that a particularly poor quality stabilizer was used.

But in most cases, the problem is caused by unbalanced lubrication, too little lubrication, especially too little external slip, and excessive plasticization causes discoloration and brittleness of the pipe.

You can add some titanium dioxide to see if it can cover it. If not, try adding stabilizer or replace it. If it is calcium-zinc stabilizer, pay more attention to the adjustment of slip agent.

In addition, lubricants affect plasticization, calcium carbonate is added with whitening agents, etc., and there is PVC resin. Under the same other conditions, poorly used PVC will become yellower and require more stabilizers. .

Under normal circumstances, one would think of the problem of stabilizers. In fact, when the stability is sufficient, lubrication is also a very important factor. In addition, if the calcium powder gets damp, it will also affect the plasticization.

The stabilizer is generally considered first, but the solution to the problem can generally be started by adjusting the lubrication system appropriately. Excluding the problem of stabilizers, focus on slip agents and dynamic balance. The stabilizers mentioned in the industry generally do not contain antioxidants. But calcium and zinc stabilizers generally contain antioxidants.

The background color of rutile is reddish, while the background color of anatase is blue. Rutile is better, but more expensive.

Whether it is rutile or anatase titanium dioxide, in the visible wavelength range (400-700nm), they have high reflectivity to light, so they have good whiteness. However, in the ultraviolet wavelength range less than the visible light range, such as 300-400 nanometers, the performance of the two different crystal types of titanium dioxide is very different.

For rutile titanium dioxide (red line) in the very lethal UV-A band (350-400nm), its reflectivity to ultraviolet rays is much lower than that of blue anatase titanium dioxide. In other words, it is The absorption rate of ultraviolet rays is much higher than that of blue anatase titanium dioxide.

Under this circumstance, the ultraviolet light that the organic resin around the film-forming substance has to share is much less, so the life of these organic substances will be longer. This is why what we usually call rutile-type titanium self-powder is much better than anatase-type weather resistance, these characteristics are innate.

During extrusion, the background color of the titanium dioxide type affects the color of the product. In the later use, the difference of the ultraviolet absorption of the titanium dioxide affects the weather resistance of the product and thus affects its color. In fact, rutile type titanium dioxide is only slightly yellower than anatase type and is not yellowish. The problem lies in the possibility of stabilizers. It may also be the use of composite stabilizers. At present, there are some domestic manufacturers of composite stabilizers. In order to reduce the cost, a lot of lubricants are added and the amount of active ingredients is reduced. The stability is slightly insufficient under the same amount.

The temperature is too high, the compression ratio of the mold is too large, the amount of stabilizer added is not enough, the lubrication system is problematic, the stability of the resin itself is not enough, the calcium powder tide, the gap between the screw and the barrel is problematic, the shear is too large, and there are many reasons. Actual situation investigation!!

problem solved:

0.1 stearic acid is added to promote plasticization
And 0.3 parts of titanium dioxide, mainly to cover up the problem of background color
The appearance of the made pipe is very white, and the color light is reddish

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Installation of PVC gutter drainage system

Installation of PVC gutter drainage system

1. Installation diagram of PVC gutter falling water system

1-1. Schematic diagram of PVC gutter water system:

1-2. PVC gutter water system node diagram:

5.2inch gutter

7inch gutter

1-3. Roof structure drawing of PVC falling water system:

Note 1: The thickness of the cement mortar leveling layer of the eaves is not less than 3cm to ensure the nail-holding strength of the plastic expansion bolt of the skyhook hanger.

Note 2: The front end of the roof tile exceeds the inner wall of the gutter (5.2 inches) by 30-50mm, (7 inches) by 30mm-120mm, and the height from the inner wall of the gutter is between 20mm-50mm.

Note 3: When the roof cornice is not perpendicular to the ground, a wedge pad (angle adjuster) must be added between the cornice and the gutter to ensure that the gutter is level.

1-4. PVC drain system catchment calculation and downspout location:

Note 1: O is the position of the downpipe, T is the highest point of the gutter, and the dotted line is the roof ridge.

Note 2: Install rainwater bucket (outlet) according to the design requirements of construction drawings

Note 3: Try not to climb the waistline for the downpipe to ensure the smooth flow of water.

Note 4: Separate drainage pipes should be set up on the balcony as far as possible, and the air conditioning condensate can be connected to the roof rain drainage pipe with an oblique tee or a reduced tee.

1-5 Timing of installation:

After the roof tile paving and the eave surface painting are completed, the gutter is installed before the scaffolding is removed, and the downpipe is installed according to the progress of the wall surface.

2. Installation of gutter

2-1 Determine the location of the downpipe:

According to the characteristics of the construction house roof, choose a reasonable downspout location. (According to the requirements of construction design drawings)

2-2 Draw a guideline:

Use an ink line from one end of the cornice to fix it at a position about 20mm-50mm down from the front end of the roof tile, and draw a line with a gradient of 10mm every three meters toward the drain to draw the gutter guideline.

2-3 Determine the length of the gutter:

A If the cornice in this section is straight, the cornice and the gutter are the same lengths.
B If the cornice is longer than the gutter, the gutter needs to be connected in sections.
C If the gutter has an outside corner of 90°, each corner will add a inside angle of 90°. For example, if the gutter has an outside corner of 135°, each corner will add a inside angle of 135°. Otherwise, use 90° or 135° outside angle.

2-5 Use and installation of the card connector

The card connector is used for the connection between the gutter and the gutter (as shown in Figure 4). Before use, the socket joint of the card connector is filled with waterproof silicone, and then the gutter is inserted into the socket joint of the card connector.

2-6 Use and installation of 90° inside and outside angle, 135° inside and outside angle

The 90° inside and outside angle, 135° inside and outside angle are used at the corners of the horizontal eaves (as shown in Figures 5 and 6), and the installation method is the same as that of the card connector

2-7 Use and installation of end cap

The end cap is used to seal the end of the gutter (as shown in Figure 7), and the installation method is the same as that ofthe male and female corners of the clamp

2-8 The use and installation of the spreader:

A. The hanger is used to fix the gutter on the cornice (as shown in Figure 8), and the hanger is inserted along with the gutter port, and the distance between the hangers is controlled, generally 300mm-500mm,

B. A hanger must be added at the joint of the gutter and 30mm at both ends of the corner to prevent sagging at the joint of the gutter.

C .Use a 6mm impact drill to drill holes on the eaves gutter guideline according to the distance of the spreader, the depth is more than 50mm, then insert the expansion plug into the punched hole, and fix it with 4mm×60mm stainless steel self-tapping screws to cover the gutter of the spreader

Note: If the roof eaves are of solid wood structure, the eaves do not need to be punched, and the eaves can be directly fixed on the eaves with screws.

2-9 Use and installation of rainwater bucket

The rainwater bucket is used for centralized drainage of the gutter (as shown in Figure 9). When installing, first open the drain on the gutter, and then evenly smear the inner wall of the two ends of the rainwater bucket with waterproof silica gel, and buckle the front of the rainwater bucket first. The outer edge of the eaves gutter, and then pull the rainwater bucket backward and upward, and buckle the back of the rainwater bucket to buckle the inner edge of the gutter.

2-10 Retaining Leaf Net

The retaining leaf net is used to cover the gutter (as shown in Figure 10) to prevent leaves from falling into the ditch and blocking the drain of the gutter. The retaining leaf net is fixed on the hanger, and there are small gaps at both ends of the hanger.  Just put the baffle leaf network card on the spreader.

3. Install downpipe

3-1 Cutting and installation of rainwater pipes:

Calculate the length of the downspout according to the position of the downspout. Cut the downspout. The cut downspout must be flat, clean the burrs, and then receive the water pipe from the gutter outlet. The rainwater pipe is fixed on the wall with a locator, and the rainwater pipe hits during installation. Obstruction, you need to use a drain or diverter to bypass the obstruction,

3-2 Use and installation of 65° drainage device and diverter, the interface device

The diverter is used for turning the rainwater pipe back and forth (see Figure 12), the diverter is used for turning the rainwater pipe left and right, and the connector is used to connect the rainwater pipe and the rainwater pipe (see Figure 12). When installing, the diverter (diverter, connector) The large size of the socket faces the reverse direction of the water flow. The rainwater pipe is inserted into the drainage device (diverter, connector) in the downstream direction (see Figure 12), and the small end of the drainage device (diverter, connector) is inserted into the rainwater pipe in the downstream direction. Use 4mm×30mm stainless steel screws to fix the connection part of the rainwater pipe and the drain (as shown in Figure 12). Note: Each fitting socket should be evenly smeared with waterproof silica gel.

3-3 The use and installation position of the positioner:

The locator is used to fix the rainwater pipe on the wall (as shown in Figure 11). According to the position of the spout, use a wire drop to determine the verticality of the rainwater pipe and determine the position of the locator; the maximum distance between the locator should not exceed 1500mm,

The downspout is in units of heels (3 meters/piece). A locator is set 100mm below the rainwater pipe port, and the locators are arranged at the end of the rainwater pipe in turn.

Use a 6mm diameter electric drill to drill holes on the wall with a depth of not less than 40mm. Use plastic expansion bolts to fill the holes, and then fix the positioner with 4mm×60mm stainless steel self-tapping screws. If the wall has an insulation layer, you must use extended expansion bolts. , To ensure that the expansion plug is fully expanded and fixed firmly.

3-5 Use and installation of 3-5 inclined tee and reducing tee

Inclined tee and variable diameter tee are used to connect the condensate water from the side of the balcony or into the roof downpipe (as shown in Figure 13). They are installed like a drainer. The diameter of the inclined tee branch is consistent with that of the rainwater pipe, and it is inclined to the reverse direction of water flow at 65 degrees. The diameter of the variable diameter tee branch is 50 mm for five inches and 75 mm for seven inches.

3-6 Use and installation of 3-6 square circle conversion

Square to round conversion is used to convert a round pipe into a straight pipe or a straight pipe into a round pipe. The rainwater pipe connector is used for splicing. The installation method is the same as that of the connector.

 

4. Special installation nodes

(1) installation of Aquaplane

1) installation of asphalt tile / linoleum tile

When the Aquaplane is installed on the asphalt tile / asphalt felt tile, the tile must be laid on the outside of the roof eaves 1cm. In order to facilitate the installation of Aquaplane, please do not use asphalt glue to bond the substrate tiles after nailing the substrate tiles. When installing the water-falling system, a section of Aquaplane frame is first connected to the roof along the slope of the roof, and the rib energy frame at the bottom of the water-skiing board is on the slot of the eaves hanger, and the rib line at the bottom of the parallel water-skiing board is used as a horizontal auxiliary line at the position of 5mm below. Then, the installation of the gutter is completed. Lift the substrate tiles and the initial layer tiles, insert the Aquaplane into the eaves, and use stainless steel nails along the Aquaplane with reserved holes to nail, the lower end of the Aquaplane ribs to ensure a firm drive in the eaves slot hanger slot mouth.

2) installation of cement tiles

If the roof tile is a cement tile, the Aquaplane must be installed, and the tile must be placed outside the eaves 1cm. Before laying the tile, nail the water ski along the roof slope and reserve the nail holes according to the Aquaplane, nail the Aquaplane on the downstream strip, (if there is no downstream strip, nail it directly on the roof structure layer.) The ribs at the bottom of the water ski should be able to be erected on the gutter of the eaves hanger. After the tiles are laid, a horizontal auxiliary line is made at the position of the rib line at the lower end of the parallel Aquaplane at the position of 5mm downward, and the position of the guide line and the eaves hanger are determined. The installation position of the corresponding eaves slot hanger is on the corresponding position of the water slide board. The eaves slot hanger is inserted into the hole with the scissors and the holes with the width of 27 mm are respectively opened on the arc protrusion and the ribs of the water slide board. The expansion bolt is fixed on the eaves mouth. The ribs at the lower end of the Aquaplane are guaranteed to drive firmly on the inner slots of the eaves slot hanger. Then, the installation of the gutter is completed.

 

 

(2) installation of balcony floor drain

When dealing with the balcony floor leakage, the standard atlas (DBJT08-81-97) is used to pre-bury a circular pipe with a diameter of 75 mm to connect the rainwater pipe transfer connector, a rainwater pipe to connect the rainwater pipe diverter, and a rainwater pipe to connect the vertical inclined tee to lead the balcony water into the whole falling water system.

3) Installation of split air-conditioning effluent, treatment of split air-conditioning effluent, through the rainwater pipe diverter, inclined three-way connection rainwater pipe, air-conditioning into the whole system.

Remarks: there are 2 kinds of water outlet sizes for one and five inches of rain water: 63mm, 63mm and 63mm, 83mm.

The second, 65 * 85 square tube has 65 degree, 90 degree steering gear and drain; the 102 * 70 square tube has only 45 degree steering gear and drain.

(3) The conversion connection of the Royal two PVC square tubes is:

(1) There is only one connection for the 102*70 square pipe to be converted to the 110 round pipe. The square pipe is butted at one end (with an interface) and the 110 round pipe is inserted into the converter joint.

(2) conversion joint of 65*85 square pipe

The adapter for the 75 round pipe is the same with both the caliber and the caliber of the pipe.

The transfer joint of the 110 round pipe is inserted inside the adapter.

(4) 65*85 square tube has three kinds of three links.

(1) connect the 55*85 square tube to the lateral oblique three links;
(2) connect the 50 circular tubes to the lateral straight three links;
(3) connect 50 round tubes to forward three links.

(5) 102*70 square tube has 2 kinds of three links.

(1) turn the 50 round tube side inclined three links;
(2) turn the 70*102 square tube side inclined three links.

 

 

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OEM plastic pipes and fittings

 

OEM plastic pipes and fittings

OEM full name: Original Equipment Manufacturer, also known as fixed-point production.

We can produce plastic pipes and fittings for you, including PVC pipes and fittings, CPVC pipes and fittings, PPR pipes and fittings, ips（PPH） threaded pipes and fittings, PE pipes and fittings.

The contents of OEM plastic pipes and fittings include:

1. Custom-made plastic pipes and fittings.

If the customer has drawings, we can make plastic pipes and pipe fittings according to the requirements of the drawings. If there are no drawings, we can design the product drawings according to the customer’s requirements, and then confirm with the customer. Make molds produce samples, and after confirmation, produce the final product.
We have designed and provided products for many outdoor sports equipment and plastic game products.

2019 The most popular outdoor game accessories supplier

2. Laser printing or engraving logo.

According to customers’ requirements and order quantity, we laser print logos or engrave logos for customers.

For example, PPR pipe fittings.

The product in the picture is the logo we engraved for our customers. If the customer wants to engrave the logo with complex patterns or more letters, we will adjust the size of the pattern or the size of the letters.
This is the mold we use to engrave the logo of PPR pipe fittings. On the blank mold, you can write letters or patterns.

We are a professional manufacturer of plastic pipes and fittings, a professional factory. Have the most advanced equipment and production lines.

We are the most professional manufacturer of OEM plastic pipes and fittings. Welcome to consult.

If you are interested, please contact email:david@pvcpipefitting.com

or you can add whatsapp:008615533994368

 https://www.pvcpipefitting.com/oem-plastic-pipes-and-fittings/

What is PVC bushing

What is PVC bushing

PVC bushing is a kind of reducing bushing made of PVC.

PVC is also called a PVC reducing bushing. It is generally made of the hexagonal bar after cutting and forging. There are many types of threads used. It is used to connect two sections of internal and external threaded pipe fittings with different diameters, which plays an irreplaceable bushing in the pipe connection.

PVC bushing is a kind of accessories, which is widely used in domestic large power station supporting projects, seawater, steam, cold water, hot water, oxygen, drinking water, refrigeration, oil, gas, medical gas sewage treatment projects, municipal engineering, chemical industry, oil refining, metallurgy, fertilizer, paper making, medicine, and other industries.

The use of PVC bushing is as follows：

1. PVC pipe has two kinds of diameter change, one is glued on the inside of the pipe, the other is glued on the outside of the pipe, PVC diameter changes directly without casing.

2. One end of the PVC reducer bushing is a large-diameter socket, and the other end is a small-diameter socket. The large-diameter socket is connected with the corresponding large-diameter pipe, and the small-diameter socket is connected with the corresponding small-diameter pipe. The direct effect of PVC reducer bushing is the transition between different diameter pipes.

  

our pvc bushings  have many standards,sch40,sch80,GB,cpvc.

Click pvc bushings to find all products and standards.If you are interested, please contact email:david@pvcpipefitting.com

or you can add whatsapp:008615533994368

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Types and functions of PVC Compression Coupling

 

Types and functions of PVC Compression Coupling

There are four types of Compression Coupling in PVC drainage pipe fittings:

(1) When the story height is less than or equal to 4m, the riser shall be provided with a Compression Coupling for each floor; when the story height is greater than 4m, it shall be determined according to the design expansion.

(2) The Compression Coupling of the horizontal trunk pipes shall be determined according to the design expansion and contraction amount.

(3) When the straight pipe section from the confluence fitting on the horizontal branch pipe to the riser exceeds 2m, Compression Coupling shall be provided, but the maximum distance between Compression Coupling shall not exceed 4m; there shall be fixed support between the two Compression Coupling to control the pipeline Expansion direction.

(4) The design expansion of the pipeline should not be greater than the maximum allowable expansion of the Compression Coupling.

 

The function of the Compression Coupling of PVC down water pipe is:

1. PVC is a rigid pipeline and has no expansion and contraction ability. In order to deal with the expansion and contraction of the pipeline caused by the environment, it can only rely on expansion.

2. Expansion joints are generally used in PVC drainage pipes. Retractors are generally used in heating pipes. The two are not interchangeable.

3. Expansion joints are provided for the water to prevent the heat expansion and contraction of the medium or the impact caused by various water hammers.

Why do PVC pipe fittings appear whitening?

 

Why do PVC pipe fittings appear whitening?

PVC pipe fittings are very common pipes in home decoration. When decorating our houses, water supply pipes and drain pipes are undoubtedly very important to us. However, PVC pipe fittings will show a certain degree of whitening after being exposed or bent and stretched. what is the problem?

The staff of PVC pipe fittings briefly introduces here:

1. Water immersion whitening: When exposed to water or steam for a long time, many types of transparent PVC products show a whitish foggy appearance. Soft products are more fierce than hard products. In this case, even if the permeated water disappears, the stabilizer cannot restore its original shape. As long as the temperature rises, the compatibility of the stabilizer can be restored to transparency.

2. Exposure whitening: When exposed outdoors, PVC pipe fittings will also show a whitening effect. Organotin stabilizers are not easy to whiten, and sulfur-containing organotin is the best, followed by laureate and maleate. Adding light stabilizers, phosphites, liquid composite stabilizers, etc. can avoid or reduce the whitening phenomenon of PVC due to whitening to a certain extent.

3. Stress whitening: Stress whitening means that under the action of mechanical external forces (such as bending and stretching), certain parts of PVC pipes and pipes (such as bending creases and stretched parts) will become white. This may be due to external forces, the orientation of polymer molecular chains, changes in PVC density and the existence of vacancies between certain molecules. This constitutes light scattering and makes PVC pipes and pipes look white.

If you want to buy PVC fittings and pipes, please click on the link:http://www.pvcpipefitting.com/products/

There are many standards and specifications.

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