JP3043264U - Pet lightweight roof tiles - Google Patents

Abstract

(57) [Abstract] [Problem] While ensuring environment resistance, durability and strength,
Provide a pet lightweight roof tile that can achieve weight reduction. SOLUTION: In a granular aggregate 2 made of PET resin,
The PET lightweight roof tile 1 is made of a kneaded material in which the cement material 3 (solidified material) is mixed. Further, a recycled PET resin product such as a waste PET bottle is used as the aggregate 2.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pet lightweight roof tile that is significantly lighter than a conventional roof tile and has the environment resistance, durability, and strength required for the roof tile.

[0002]

[Prior art]

 Generally, it is necessary to secure environment resistance, durability, and required strength to roof tiles mainly against changes in temperature, wind and snow, but conventionally, clay is molded and fired, and sand is cemented with cement. Various types of roof tiles are used, including those made from asbestos and other materials.

On the other hand, in recent years, with the high level of economic activity and improvement of living standard, the generation of wastes has rapidly increased, and the shortage of these disposal methods and disposal sites has become a big social problem. In particular, since waste plastic has a high calorie content, it easily damages the incinerator when it is incinerated, and because it is lightweight and difficult to rot, it has problems such as hindering the solidification of the ground. Among the waste plastics, PET resin is widely used for consumables such as beverage bottles, video tapes, telephone cards, etc., and the amount of waste is increasing with the increase in the production amount of these.

In order to cope with such an increase in waste plastics, there is a recent trend to recycle waste plastics, and it is being studied to effectively use them as remolded products such as piles and flowerpots. The department is running.

By the way, when the above waste plastic is recycled, it is discarded again depending on the purpose of the recycled product, and its disposal becomes a problem again, and the repetition is repeated. Therefore, when recycling waste plastics, it is required to develop applications that do not require repeated waste disposal.

Further, in order to recycle waste plastic, it has been conventionally said that a high degree of separation / separation / collection of waste is indispensable, but such complete separation / recovery is difficult, and therefore recovery is difficult. The reality is that the recycling rate of waste plastics produced is limited.

[0007]

[Problems to be solved by the device]

 On the other hand, the conventional roof tiles themselves have a large weight, and since a large number of these heavy tiles are laid, the weight of the entire roof also becomes large. Therefore, for example, a house may collapse due to an earthquake.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object thereof is to provide a pet lightweight roof tile that can effectively utilize the waste plastic and is strong against earthquakes.

[0009]

[Means for Solving the Problems]

 The applicant of the present application studied a material that replaces the conventional roof tile material, and paid attention to the waste PET resin and waste polyester resin that are generated in large quantities. These resins have high strength and high heat resistance, as well as excellent chemical resistance and electrical insulation, and by adopting them as roof tile materials, they can be made lightweight while ensuring environmental resistance, durability and strength. The present invention has been made based on the idea that it can be realized.

According to the first aspect of the present invention, a granular aggregate mainly composed of PET resin (polyethylene terephthalate resin) or polyester resin and a coagulant mainly composed of cement are kneaded with water to have a predetermined shape. A pet light roof tile that is characterized by being solidified into.

A second aspect of the present invention is the method according to the first aspect, wherein the aggregate crushes and melts waste PET resin or waste polyester resin, molds the melted resin with a mold, and crushes a plastic mass that is solidified by cooling. It is characterized by being formed by

According to a third aspect of the present invention, in the first or second aspect, the aggregate has a particle size of 0.1 to 8 mm and is contained in an amount of 5 to 80% by weight based on the weight of the roof tile. It has a feature.

Here, the aggregate of the present invention only needs to contain PET resin or polyester resin as a main component (desirably 70% by weight or more), and does not necessarily have to be a single resin. A small amount of filler, mixed spinning material, etc. may be mixed. This means that when recycling waste plastic, it does not necessarily require a high degree of separation / separation recovery of waste plastic, and the present invention has a major feature in this respect.

The waste PET resin and waste polyester resin of the present invention mean beverage PET bottles, video tapes, cassette tapes, telephone cards, prebate cards, egg packs, roentgen films and the like. It also includes polyester fibers used in carpets, carpets, threads, cotton, etc.

The cement as referred to in the present invention is a dry powder formed from silica, alumina, coal, iron oxide, and magnesia, which is hardened when mixed with water.

Here, the aggregate according to the present invention preferably has a particle size of 0.1 to 8 mm and is contained in an amount of 5 to 80% by weight based on the weight of the roof tile. Setting the particle size to 0.1 mm or less is not economical because it imposes an excessive burden on the manufacturing process of crushing plastic lumps to obtain aggregates. Also, setting the particle size to 8 mm or more, roof tiles Is not desirable in appearance and is not desirable in strength. If the mixing ratio is less than 5% by weight, the weight cannot be reduced, and if it exceeds 80% by weight, the required strength cannot be obtained.

[0017]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 4 are views for explaining a pet lightweight roof tile according to an embodiment of the present invention. FIG. 1 and FIG. 2 are perspective views and sectional views of the pet lightweight roof tile, and FIG. FIG. 4 is a cross-sectional side view showing an apparatus for producing a plastic lump which is a raw material for granules.

In the figure, reference numeral 1 is a pet lightweight roof tile laid on a roof. This pet lightweight roof tile 1 is a mixture of a granular aggregate 2 mainly composed of PET resin and a cement material 3 and an appropriate amount thereof. It is formed by pushing the product kneaded with water into a mold to form a roof tile and then drying it.

The aggregate 2 is a granular material having a particle size of 0.1 mm to 8 mm, and is contained in an amount of 5% by weight to 80% by weight based on the total weight of the pet lightweight roof tile 1. Here, the particle size and content of the aggregate 2 will be appropriately selected depending on the size and thickness of the roof tile, or the site where the roof is used. Generally, it is preferable that the particle size is 1 to 4 mm and the content is about 40% by weight.

The aggregate 2 is a recycled PET bottle. In addition to the PET bottle, a recycled video tape, cassette tape, telephone card, prebate card, egg pack, X-ray film, etc. May be

Next, a method for manufacturing the aggregate 2 will be described. In FIG. 4, reference numeral 10 is a plastic lump manufacturing apparatus. In the manufacturing apparatus 10, an apparatus main body 11 including a drive unit and an operating unit is provided, a pushing cylinder 12 extending substantially horizontally from the main body 11, and the cylinder 12 An injection cylinder 13 connected to the tip extruding portion and extending in a substantially vertical direction, a mold 14 connected to the lower end of the cylinder 13, and a water tank 15 disposed below the mold 14. .

A screw 16 is rotatably inserted and arranged in the extrusion cylinder 12, and the screw 16 is rotationally driven by a motor (not shown) in the apparatus body 11. Further, a hopper 17 is arranged at the base of the extrusion cylinder 12.

An injection plunger 18 is vertically slidably inserted in the injection cylinder 13, and the plunger 18 is driven forward and backward by hydraulic pressure or air pressure. A small-diameter nozzle 20 is attached to the lower end of the injection cylinder 13, and the mold 14 is arranged below the nozzle 20.

The mold 14 is of a left-right two-divided type, and upper edges of the left and right molds 14a and 14b are openably and closably connected by a hinge (not shown). Hemispherical cavities 21 are provided in the opposite surfaces of the left and right dies 14a and 14b, respectively, and the small diameter nozzle 20 faces the cavity 21. The mold 14 is configured to be vertically movable between the small diameter nozzle 20 and the water tank 15 by a guide member 22.

A heater 23 is wound around each of the outer peripheral surface of the extrusion cylinder 12, the lower outer peripheral surface of the injection cylinder 13, and the outer peripheral surface of the small diameter nozzle 20, and the heater 23 is a power source inside the apparatus main body 11. It is connected to the.

A method of molding the aggregate 2 by the molding device 10 will be described. First, the waste PET bottle is crushed to form a minute raw material M for molding, and the raw material M for molding is put into the hopper 17. The molding raw material M is heated and melted by the heater 23 while being stirred and conveyed by the screw 16, and the molten resin is extruded into the injection cylinder 13.

When the injection cylinder 13 is filled with the molten resin, the injection plunger 18 descends, and the molten resin is injected and filled from the small diameter nozzle 20 into the cavity 21 of the mold 14. When this filling is completed, the plunger 18 moves up.

Next, the mold 14 descends, and along with this, the opening / closing link 25 opens the right mold 14 b, whereby the ball-shaped molded product 26 falls into the water tank 15. This molded product 26 is cooled and solidified in water by a wire net 27 to become a plastic lump (pet stone). The structure of the molding apparatus 10 and the molding method are described in detail in Japanese Patent Publication No. 7-17032.

Thereafter, the plastic lump 26 is pulled up from the water tank 15 and crushed by a crusher (crusher) so as to have a predetermined particle size to form the aggregate 2.

The operation and effect of this embodiment will be described. According to this embodiment, since the roof tile 1 is formed by the kneaded material of the aggregate 2 made of waste PET resin and the cement 3, the waste plastic can be effectively used and its application can be expanded. In addition, it is possible to significantly reduce the weight while ensuring the environment resistance, durability, and strength required for roof tiles, which in turn can prevent the collapse of houses during an earthquake.

According to the present embodiment, first, a plastic lump (pet stone) is produced by melting and solidifying a waste PET resin such as a waste PET bottle, and the granules produced by crushing the pet stone are Since the aggregate 2 is used, it is possible to manufacture the aggregate 2 without any trouble even if a small amount of other resin or the like is mixed in the PET resin as the raw material, and the waste plastic is used to produce the aggregate 2. In manufacturing, it has the effect of reducing the burden of separating and separating and collecting waste plastic.

Further, since the recycled product of the waste plastic is adopted as the material of the roof tile, the roof tile as the recycled product can be used for a long time, the problem of the waste disposal of the recycled product can be avoided, and the roof tile 1 Since a considerable amount of PET bottles are used per sheet, a large amount of waste can be treated.

[0033]

[Table 1]

Table 1 shows the results of comparison between the weight of the pet lightweight roof tile (particle size of the aggregate: 1 to 4 mm, content: 40% by weight) manufactured according to this embodiment and the weight of the conventional cement roof tile. Show. As is clear from the table, the conventional roof tile is 4.6 kg for the Western tile type and 3.6 kg for the Japanese tile type, whereas the pet lightweight roof tile of this embodiment is the Western tile type. It can be seen that the weight is significantly reduced to 2.9 kg and 2.0 kg for the Japanese style roof tile type.

Further, a test piece (diameter about 28 mm, length about 20 to 55 mm) made of a plastic lump (Pet Stone) using the waste PET bottle of the present embodiment as a raw material was prepared, and a compression strength test and a water absorption test of the test piece were made. A durability test and a heat resistance test were conducted.

In the above compression strength test, it was 800 to 870 Kgf / cm ² . Further, in the water absorption test, it was immersed in water at 20 ° C. for a predetermined time, and then the water was wiped off to measure the mass, and the water absorption was 0.1%. In the durability test, the temperature was raised from -17 ° C to 40 ° C over 2 hours, and then the temperature was lowered to -17 ° C over 2 hours, and the cooling cycle was repeated twice. There was no change. Further, in the above heat resistance test, when left in an atmosphere of 100 ° C. for 24 hours, there was no change in appearance such as discoloration or cracking.

Although the PET lightweight roof tile of the above embodiment employs the PET resin aggregate 2 made of a waste PET bottle, the PET lightweight roof tile of the present invention uses a commercially available PET resin as a raw material. May be.

The kneaded mixture of aggregate and cement made of PET resin or polyester resin according to the present invention can also be applied to bricks, blocks, and building wall materials. It can be expanded, and a large amount of waste plastic can be processed.

[0039]

[Effect of the invention]

 As described above, according to the pet lightweight roof tile of the present invention, the granular aggregate mainly composed of PET resin or polyester resin and cement are kneaded and solidified into a predetermined shape. It is possible to significantly reduce the weight while ensuring the environment resistance, durability, and strength required for roof tiles, and it is possible to avoid the collapse of houses due to an earthquake, for example.

According to the second aspect of the present invention, a plastic lump (pet stone) obtained by crushing and melting the waste PET resin or the waste polyester resin, molding the melted resin with a mold, and cooling and solidifying the melted resin. Since it is made by crushing, the aggregate can be obtained without any problem even if other resin, reinforcing material, filler, etc. are mixed in the PET resin as the raw material, and the waste plastic is used to make the bone. When manufacturing lumber, it is possible to reduce the burden of separating and separating and recovering waste plastic, and to promote the recycling of waste plastic.

According to the invention of claim 3, since the aggregate has a particle size of 0.1 to 8 mm and is contained in an amount of 5 to 80% by weight based on the weight of the roof tile, it is lightweight and has high strength. There is an effect that the roof tiles can be realized economically.

[Submission date] July 14, 1997

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

The invention of claim 1 is a kneaded product obtained by kneading a granular aggregate mainly composed of PET resin (polyethylene terephthalate) or a polyester resin and a coagulant mainly composed of cement with water. It is a pet lightweight roof tile characterized in that it is a plate-shaped body that is obtained by solidifying and is rectangular in a plan view.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

In the figure, reference numeral 1 is a pet lightweight roof tile laid on a roof. This pet lightweight roof tile 1 is a mixture of a granular aggregate 2 mainly composed of PET resin and a cement material 3 and an appropriate amount thereof. It is a plate-like body having a rectangular shape in a plan view, which is formed by molding a product kneaded with the above water with a mold into a roof tile shape and then drying it.

[Brief description of the drawings]

1 is a perspective view for explaining a pet lightweight roof tile according to an embodiment of the invention of claims 1 to 3;

FIG. 2 is a cross-sectional view of the pet lightweight roof tile.

FIG. 3 is a perspective view of a roof portion on which the pet lightweight roof tile is laid.

FIG. 4 is a cross-sectional side view for explaining an apparatus for manufacturing a plastic lump that is a material for the aggregate of the pet lightweight roof tile.

[Explanation of symbols]

 1 Pet lightweight roof tile 2 Aggregate 3 Cement material (solidified material)

[Procedure amendment]

[Submission date] July 14, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (3)

[Utility model registration claims] 1. A product obtained by kneading a granular aggregate mainly composed of PET resin (polyethylene terephthalate) or polyester resin and a coagulant mainly composed of cement with water to coagulate into a predetermined shape. Pet lightweight roof tile characterized by being. 2. The waste P according to claim 1, wherein the aggregate is waste P.
A pet lightweight roof tile, which is obtained by crushing and melting ET resin or waste polyester resin, molding the molten resin by a mold, and crushing a plastic mass (pet stone) obtained by cooling and solidifying. 3. The aggregate according to claim 1 or 2,
It has a particle size of 0.1 to 8 mm and is 5 to 8 with respect to the weight of the roof tile.
Pet lightweight roof tile characterized by containing 0% by weight.