JPS5898236A - Sandwich pipe and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The intermediate layer of the lotus/deutsch component pipe of the present invention is made of thermoplastic resin, and the inner and outer layers are made of thermosetting plastic layers reinforced with a reinforcing material such as glass fiber. Deutsche pipe and its manufacturing method.

Conventional sandwich tubes, as disclosed in Japanese Patent Publication No. 4B-37139, have an intermediate layer made of a filler such as sand and a thermosetting plastic in order to increase rigidity and reduce costs. As shown in Tokuko Sho-Tsuchi No. 37139, a strip-shaped intermediate material made of a filler such as sand and thermosetting plastic is placed on a strip-shaped body made of nonwoven fabric, etc., and the intermediate material is passed from below the inner layer to the outside of the inner layer. Wrapping it spirally on the inside has the following drawbacks in manufacturing. Since a thermosetting resin is used for the entire structure, it is difficult to achieve a smooth curing reaction as in #1 when the intermediate material becomes thicker. Therefore, in order for the curing reaction to proceed smoothly, it is necessary to use a long mandrel and a long curing furnace, and it is also necessary to heat the inner surface of the mandrel and slow down the molding speed.

In such a complicated manufacturing method, the manufacturing equipment is expensive, the probability of producing defective products is high, and productivity is steadily reduced, resulting in a high product price. Because it contains a filler such as sand and a Monoke hardening agent consisting of a thermosetting plastic, its pot life is limited by changes in temperature, making it impossible to store for a long time and limiting its working time.

If a material made of filler such as sand and thermosetting plastic is extruded using an extruder during molding of the intermediate layer, it will cause severe wear and tear on screws and molds, resulting in high equipment maintenance costs. Materials made of fillers such as sand and thermosetting plastics have a high specific gravity, so handling such as loading and unloading the materials is complicated, and the load on the mandrel is large during the manufacturing process. Thick t to move forward
This requires a lot of force, making the device larger and more expensive.

In the case of a material made of a filler such as sand and a thermosetting plastic, an extra material such as a nonwoven fabric is required because the intermediate material must be placed on a strip of ICH nonwoven fabric and wrapped to form an intermediate layer. At the same time, extra equipment is also required, such as a device for feeding nonwoven fabrics and a support stand for transporting materials made of fillers such as sand and thermosetting plastics. In other words, the manufacturing method disclosed in Japanese Patent Publication No. 48-37139, in which the intermediate layer is made of a filler such as sand and a thermosetting plastic, requires expensive manufacturing equipment and the manufacturing process is complicated, resulting in low productivity. The lower the price, the more expensive the product will be.

Products include fillers such as sand and thermosetting plastics.

It is a sandwich pipe product with a middle layer made of a material that is heavy and difficult to handle.As a result, the length of the pipe during construction is limited from 2 m to 4 m at most, which requires a large number of pipe joints and a large number of man-hours. Because of this, construction costs are high.

Sandwich tubes with an intermediate layer consisting of a filler such as sand and thermosetting plastic can be cut without using a special cutter such as a diamond cutter or a turret, as well as when cutting tubes at construction sites during the manufacturing process. I can't cut it, and it takes a long time.
This reduces work efficiency.

A sandwich tube with an intermediate layer made of a filler such as sand and a thermosetting plastic is weak against impact and easily cracks, so there is a high risk of water leakage when liquid is poured inside the tube.

In order to eliminate the above-mentioned drawbacks, the present invention is characterized by forming an intermediate layer of thermoplastic plastic.One embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, one end of the horizontal mandrel 2 is supported by an appropriate support frame. Reference numeral 3 is a core material such as a paper band, which is wound around the mandrel 2 and sent out while being slid and rotated, so that a core tube 5 is continuously formed. A mold release material 6 such as cellophane is wrapped around the core tube 5 at an appropriate angle, and then a strip 7 of glass fiber cloth or roving impregnated with a thermosetting resin is advanced while rotating. The mold release material 6 such as cellophane on the mold release material 5 is wound spirally to form an inner surface layer 8. An extruder 9 is installed so as to be located on the side of the inner layer 8 being formed. The extruder 9 extrudes thermoplastic resin into a strip, and the middle layer 110 is spirally wound around the outside of the inner layer 8 in the same manner as the inner layer 8 to form the middle layer 11. On this intermediate layer 11, in the same manner as the inner layer 8, a band 7 of glass fiber cloth or roving impregnated with a thermosetting resin is wound helically to form an outer layer 12. When the tube is passed through the curing furnace 13, it is completely cured, and after cutting the tube to an appropriate length, the inner core tube 5 and mold release material 6, such as cellophane, are pulled out to form a German tube as shown in Fig. 3. I can do it. In order to further improve the adhesion between the intermediate layer 11, the inner layer 8, and the outer layer 12, a method may be used in which the intermediate material 10 is extruded with stripes or grooves, or an adhesive may be applied to the intermediate material 10. You can also spray it.

Furthermore, if the intermediate layer 11 is to be made thicker, it is possible to extrude it to create cavities as necessary to save material. When the intermediate materials 10 are wound spirally, the boundaries between the intermediate materials 10 are made of thermoplastic resin, so they easily adhere to each other, and furthermore, the uncured thermosetting resin of the inner layer 8 and the outer layer 12 fills the gaps between the boundaries. As it penetrates, the intermediate layer 11 that is formed becomes completely continuous. To make it more complete, a thermosetting resin may be poured into the boundary between the intermediate titlOs, or a thermoplastic resin may be extruded and filled. Alternatively, several extruders may be installed, and the intermediate materials #10 may be laminated several times, so that the boundaries between the intermediate materials 10 are staggered.

Next, when comparing the case where the intermediate layer 11 of the present invention is made of thermoplastic plastic and the case where it is made of a filler such as sand and thermosetting plastic, there are the following features. In the method of the present invention, the specific gravity of the material is smaller (
fishing machine ~%), so it is easy to handle. Since there is no need to add a hardening agent, it can be stored for a long time.
Thermoplastic resins can be used for more than one year), so there are no restrictions on working hours. Since the specific gravity is small, the load applied to the mandrel 2 is small, and the mandrel 2 can be short and the force for sliding it on the mandrel 2, rotating it, and moving it forward can be small, so the manufacturing equipment can be simplified and the cost can be reduced. If a material made of filler such as sand and thermosetting plastic adheres to mechanical equipment, it is difficult to wipe off and is unsanitary.Furthermore, if any residual residue remains, it may cause problems in later manufacturing processes and result in defective products. Plastic resins are much easier to clean and manage.

In the case of thermoplastic resin, there is no need to place it on a strip of nonwoven fabric or the like and to form it, and the feeding device for the strip of nonwoven fabric or the like is used. For products made of filler such as sand and thermosetting plastic, the thicker the intermediate layer 11, the longer the mandrel 2, heating the inner surface of the mandrel 2, or lengthening the curing furnace 13 to increase the production speed. In order to make the curing reaction go smoothly by slowing down the curing reaction, the manufacturing process becomes complicated, the manufacturing equipment becomes expensive, and the productivity is extremely low. In the case of thermoplastic resin, the extruded thermoplastic resin intermediate material 10d itself does not need to be cured, and since it is in a heated state, the thermosetting resin of the inner layer 8 and outer layer 12 is cured by this heat. Make things run smoothly. Therefore, there is no need to heat the inner surface of the mandrel 2, the mandrel 2 can be short, and a curing furnace is not required at all, or even if it is necessary, it can be much simpler than one made of filler such as sand and thermosetting plastic. The formulation is severely restricted by the tendency to flow when extruded from a Mononoke extruder consisting of a filler such as sand and a thermosetting glasstic, so its application in terms of formulation is limited. In the case of thermoplastic resins, there is a wide range of resin selection depending on physical properties and economical efficiency, and foams can be easily used, and calcium carbonate, wood flour, mica, etc. can also be used as fillers, and the range of applications is wide. In other words, an intermediate layer 11 in which thermoplastic plastic or glue is formed has a simpler manufacturing process than an intermediate layer 11 in which a filler such as sand and a thermosetting plastic are formed. Since the scale can be reduced, it becomes cheaper, the defective rate is reduced, and productivity is improved.

Next, comparing the products, the Santoi and Te tubes, which have thermoplastic plastics formed in the intermediate layer 11, have better impact resistance than the Santoi and Te tubes, which have the intermediate layer 11 made of a filler such as sand and thermosetting plastic. It is much more difficult to crack and there is no risk of water leakage. Santoi and Chi pipes in which foam is formed as the intermediate layer 11 weigh approximately 2 to 30 pounds more than sandwich tubes in which the intermediate layer 11 is made of filler such as sand and thermosetting glass, and must be carried out during construction work. It is easy to handle the tube, and its light weight makes it possible to double or triple the length of the tube.
Since the number of pipe joints can be doubled, the number of pipe joints can be reduced, and the price of pipes and construction costs can be greatly reduced.

1! A German pipe in which the intermediate layer 11 is made of thermoplastic plastic is much easier to cut during the manufacturing process and on-site than a pipe in which the intermediate layer 111C is made of a filler such as sand and thermosetting plastic. Easy and efficient work.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the method of the present invention, FIG. 2 is an enlarged cross-sectional view of the main part, and FIG. 3 is a cross-sectional view of a German pipe manufactured by the method of the present invention. 8...Inner layer 11...Middle layer 12...Outer layer Patent applicant Higashi 1) Tadashibe

Claims (1)

[Claims] 1. A sandwich tube having the structure of a sandwich tube, with an inner layer and an outer layer made of fiber-reinforced thermosetting plastic, and an intermediate layer made of thermoplastic plastic. 2. A sandwich tube according to claim 1, wherein the intermediate layer is made of plastic foam. 3. The sandwich tube according to claim 1, wherein the intermediate layer contains calcium carbonate, wood flour, mica, etc. as a filler. 4 Mandrel J: A cylinder formed by winding a band-shaped body such as a band-shaped paper in a spiral shape is advanced while rotating, and a release material such as cellophane is wrapped around the outer periphery of the cylinder, and then a thermosetting resin is impregnated. A strip of reinforced material such as glass fiber is wound to form an inner layer, a thermoplastic resin strip is spirally wound around the outer periphery of this inner layer to form an intermediate layer, and a thermosetting resin is applied to the back page. The feature is that the outer layer is formed by wrapping a strip of reinforced material such as impregnated glass fiber.
Deutsche tube manufacturing method. 5. Place plastic alone. 5. The method of manufacturing a toy/tube according to claim 4, wherein the intermediate layer is formed by simultaneously spraying reinforcing material such as glass fiber and glass fiber. 6. The method of manufacturing a sandwich tube according to claim 4, wherein the intermediate layer is formed by extruding a thermoplastic resin intermediate material to form a cavity. 7. Manufacture of a German pipe according to claim 4, characterized in that the thermoplastic intermediate material that will become the intermediate layer is extruded in several batches using separate extruders and laminated to form the intermediate layer. Method.