JP2000096922A - Synthetic resin-made window frame, manufacture of frame material used therefor and window for building opening part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain high heat insulation and high sound insulation and contrive slimness while securing practically sufficient strength by using a frame material covering the surface of a core material formed of bamboo laminated wood with a synthetic resin layer, and assembling these frame materials into a rectangle to constitute a synthetic resin-made window frame. SOLUTION: A frame material 4 covering the surface of a core material 2 with a synthetic resin layer 3 is used, the synthetic resin layer parts of both ends of these frame materials are welded, and assembled into a rectangle to make a synthetic resin- made window frame 1. After vertically divided bamboo materials are dried, a proper amount of an adhesive is used to be laminated and collected, synthetic resin is heated and melted by an extruder, and the hollow molding of a desired cross section shape is made from the neighborhood of the outlet of a die while it is gradually diameter- reduced. The core material 2 having a cross section smaller than only by the thickness of synthetic resin covered on the surface symmetrical with the cross section shape of the frame material desired in parallel with the melting molding of the synthetic resin is inserted in the die, and fitted to the hollow part of a melt and molded synthetic resin hollow molding in the neighborhood of the outlet of the die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin window frame. More specifically, the present invention relates to a window frame in which bamboo is used as a core material and a surface layer portion is a synthetic resin layer.

[0002]

2. Description of the Related Art In general, synthetic resin window frames are superior in heat insulation and soundproofing to metal window frames made of aluminum, iron, or the like. Has been reached.

On the other hand, a synthetic resin window frame has a high strength.
The cross-section of each frame material forming the window frame has a hollow shape having a larger cross-sectional area than the aluminum frame material. For this reason, while having excellent heat insulation and soundproofing properties, there are problems that the space required for storage and the like is large, inventory management costs are increased, transportation efficiency is poor, and transportation costs are increased.
In addition, it is difficult to adapt to a case where a window frame that is slim in design is desired because the cross-sectional area of the frame material is large.

[0004] In order to address these problems, there has been used a synthetic resin frame material in which a metal reinforcing material is inserted. However, the use of a metal material is a characteristic of the synthetic resin. This has an adverse effect on certain high heat insulation properties, and a reduction in workability due to an increase in the weight of the frame material is inevitable. Further, the metal material has a disadvantage that it corrodes due to moisture that has entered inside.

Japanese Utility Model Laid-Open No. 59-32090 discloses a window frame made of a synthetic resin using a wooden core as a reinforcing material. The following problems have been pointed out with respect to the window frame. I have.

That is, by reinforcing the frame material constituting the window frame made of synthetic resin with a wooden core, the above-mentioned drawbacks when metal reinforcing materials are used are considerably improved, but the strength is not always sufficient. In some cases, especially due to the difference in thermal shrinkage of synthetic resin and wood, repeated expansion and contraction due to changes in temperature causes partial swelling and cracking of the synthetic resin layer over time. Not only does the appearance deteriorate, but also the occurrence of swelling and cracks causes water to enter between the synthetic resin layer and the wooden core, corroding the core and reducing the strength of the window frame. Problem has been pointed out.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has a practically sufficient strength while maintaining high heat insulation and high sound insulation of a synthetic resin window frame. In addition to slimming down, space saving and cost reduction during storage and transportation and design improvement are achieved, and the swelling and cracking of the synthetic resin layer over time, which is likely to occur when using a wooden core material in the past, and its origin It is an object of the present invention to provide a window frame in which adverse effects such as a decrease in strength of the window frame due to corrosion of a core material due to intrusion of moisture are prevented.

It is another object of the present invention to provide a window for a building opening having a structure in which double-glazed glass or single-pane glass is fitted into a slim window frame to reinforce the strength of the window frame.

[0009]

The present inventor has conducted various studies to achieve the above-mentioned object, and as a result, has found that the above-mentioned problem which occurs when a conventional wooden core material is used is caused by the following. I got

That is, in the case of a wooden core, the core is generally formed using a single material.

On the other hand, when the core is inserted into the hollow of the synthetic resin molded article, if a gap is formed between the hollow inner wall of the synthetic resin molded article and the core, the reinforcing effect of the core is reduced. In order to prevent this, high accuracy is required for the finished dimensions of the core material.

By the way, when a wooden core is formed, if a node is present, the portion is hard, so that the vibration of the processing blade occurs, and the accuracy of the finished dimension of the core decreases.

[0013] For this reason, conventionally, prior to the forming of the core material, the knot is punched out by hand to remove an extremely hard part, and then formed.

However, a part of the synthetic resin layer enters into the hole where the node is punched, so that a so-called anchor effect is generated.
Restrains the relative movement between the core material and the synthetic resin layer, and due to the difference in the thermal shrinkage of the synthetic resin and wood, due to changes in temperature, synthetic resin thinner than the core material Tensile and contractive stresses are repeatedly applied to the layer part, resulting in partial swelling and cracking of the synthetic resin layer, and the air present in the holes punched by the nodes expands as the temperature of the outside air rises. It has been found that partial swelling of the synthetic resin layer is promoted.

[0015] For this reason, the present inventor has found that the object can be achieved by using bamboo and a core made of laminated bamboo in place of the knotted tree.

That is, according to the present invention, the above object is solved as follows.

(1) Using a frame material in which the surface of a core material made of laminated bamboo is covered with a synthetic resin layer, these frame materials are assembled into a square to form a synthetic resin window frame.

(2) In the above item (1), the laminated material of bamboo was obtained by substantially removing the outer layer and the inner layer from the three-layer structure of the outer layer, the intermediate layer and the inner layer of the original bamboo. Glued lumber made of bamboo is used.

(3) In the above item (1) or (2), a frame material is used in which the synthetic resin layer portion extends at both ends of the frame material in the length direction from the core material portion. The members are connected by welding the extended synthetic resin layer portions, and these frame members are assembled into a square to form a synthetic resin window frame.

(4) As a method for manufacturing the frame material used in the above item (1), (2) or (3), a vinyl chloride resin is used as a synthetic resin, and the synthetic resin is heated and melted by an extruder. Forming a hollow molded article having a desired frame material cross-sectional shape while gradually reducing the diameter, and when the surface resin temperature of the hollow inner surface of the hollow molded article is within a temperature range of 175 to 195 degrees, the hollow molded article is formed. A method of manufacturing a frame material for a synthetic resin window frame, in which a core material made of laminated bamboo is inserted into the hollow of the object to cover the surface of the core material with a synthetic resin layer.

(5) The synthetic resin window frame described in the above item (1), (2) or (3) is provided with a double-layered glass or a single-pane glass around one side surface facing the glass window frame. The part and the window frame part abutting on the part are at least partially adhered and fixed and fitted to form a window for a building opening.

In the present specification, a window frame is collectively referred to as a window frame.

[0023]

Embodiments of the present invention will be described below.

FIG. 1 is a perspective view showing an embodiment of a synthetic resin window frame of the present invention, which is partially cut away.

Using a frame material (4) in which the surface of a core material (2) made of bamboo laminated material is covered with a synthetic resin layer (3), the synthetic resin layer portions at both ends of these frame materials are welded. Thus, the window frame (1) made of synthetic resin is assembled in a rectangular shape.

The following production method is recommended to obtain a bamboo laminated timber used in the present invention.

First, a bamboo material, for example, a bamboo material obtained by vertically dividing Moso bamboo as it is, is boiled as it is or if necessary for several tens of minutes to soften it so that it can be easily cut, and then the knots and the skin on the endothelium side are obtained. The side nodes, and the inner skin and outer skin are scraped off to a certain thickness to remove the projections on the surface and to make the material uniform.

Next, when a relatively large number of vertical divisions, such as eight divisions, are performed as vertical divisions, each vertically divided bamboo material is dried and then laminated and assembled using an appropriate adhesive. Glued lumber.

On the other hand, when a relatively small number of vertical divisions, such as two divisions, are performed, the bamboo material is sandwiched between upper and lower rollers while being heated at a high frequency and pressed and developed into a flat plate. It is quenched with water immediately after pressure development to prevent it from returning to its shape. Thereafter, the obtained bamboo plate can be laminated and laminated using an appropriate adhesive to form a laminated bamboo material.

The boiling for softening the vertically divided bamboo material varies depending on the type of bamboo used, the age of the bamboo, the thickness of the bamboo, and the like.
It softens in a boiling time of 30 minutes, and the cutting process becomes easy.

The heating temperature due to high frequency when processing and developing into a flat plate is usually about 150 ° C., since carbonization coloring phenomenon in which the bamboo material starts to turn brown is observed.
It is recommended that the process be performed in the range of 30 to 145 degrees, preferably around 140 degrees.

The core material (2) in the present invention is similar to the cross-section of the desired frame material in advance and is smaller than the bamboo laminated material by the thickness of the synthetic resin layer (3) covering the surface. It is obtained by molding into a long object having a cross section.

In order to cover the surface of the core material (2) with the synthetic resin layer (3), the following is preferred.

FIG. 2 is a drawing schematically showing a method of coating the surface of the core material (2) with the synthetic resin layer (3).

First, a synthetic resin is heated and melted by an extruder to form a hollow molded article having a desired cross-sectional shape of a frame material until reaching the vicinity of the exit of the die (5) while gradually reducing the diameter.
Next, in parallel with the melt molding of the synthetic resin, a core material (2) having a cross-section similar to the cross-sectional shape of the desired frame material and having a smaller cross-section by the thickness of the synthetic resin to be coated on the surface is placed on the die (5). ), And the core material (2) is fitted into the hollow portion of the melt-molded synthetic resin hollow molded article near the exit of the die, so that the surface of the core material (2) is covered with the synthetic resin. And extrude from the die (5) outlet.

When the core material (2) is fitted, the surface resin temperature of the hollow inner surface of the synthetic resin hollow molded article may be in the range of 175 to 195 degrees when vinyl chloride resin is used as the synthetic resin. preferable. Next, the molded product in which the surface of the core material (2) is coated with the synthetic resin layer is cooled by a sizing device (6) to be stabilized in shape, and is sandwiched between a pair of take-off rollers (7) and taken off. A long frame material is manufactured.

The long frame material is cut into an appropriate length and assembled into a square to obtain the synthetic resin window frame of the present invention. At the time of assembling into a square, at the both ends of the frame material, using a frame material in which the synthetic resin layer portion extends in the length direction than the core material portion, the adjacent frame materials are joined together by the extended synthetic material. It is recommended that the resin layers be connected by welding and assembled into a square shape.

Specifically, a long frame material is cut at an angle of 45 degrees at both ends to have an appropriate length based on the desired size of the window frame.

Next, one end of the core material (2) at the end of the frame material is hit with a hammer in the length direction or pressed with an appropriate tool to convert the core material (2) into the synthetic resin layer (3). The protruding core end is cut at an angle of 45 degrees, and the protruding core end is continuously hit or pressed, so that both ends of the frame material are In this case, the synthetic resin layer portion extends in the length direction from the core material portion.

Next, the synthetic resin layer portions at the ends of adjacent frame members cut at an angle of 45 degrees are brought into contact with each other and heat-fused to form a square. can get.

In the present invention, the surface of the core made of laminated bamboo is coated with the synthetic resin layer, usually, the entire surface of the core is coated.
The portion located on the indoor side may not be covered with the synthetic resin layer, but may be configured to face a Japanese-style room with the bamboo laminated material as the surface material as it is.

The synthetic resin constituting the synthetic resin layer in the present invention is generally a thermoplastic synthetic resin such as a vinyl chloride resin, a polypropylene resin, an ABS resin, and a fiber reinforced resin in view of ease of processing, weather resistance and the like. Is used.

Further, in the present invention, when the frame material is slimmed and practically the strength of the window frame needs to be reinforced, the following mode is recommended.

In general, when the window frame of the present invention is used, a double glazing is generally fitted into the window frame in order to take advantage of its good heat insulating properties and high soundproofing properties. In this embodiment, the strength of the window frame is reinforced by utilizing the rigidity of the multilayer glass. That is, FIG. 3 shows a part of a vertical cross-sectional view in which a double-glazing (8) is fitted into the window frame (1) of the present invention. When the glass (8) is placed, a peripheral portion on one side of the double-glazed glass (8) facing the window frame (1) and the window frame (1) portion abutting thereon are bonded and fixed. . As the bonding means, bonding with a double-sided tape (9) is most preferably used from the viewpoint of work efficiency, but other suitable bonding means such as bonding with an adhesive may be used.

The strength of the window frame (1) is reinforced by the rigidity of the multilayer glass (8) by bonding and fixing the peripheral portion of one side of the double glass (8) and the window frame portion in contact therewith. Is made.

In general, in a window frame assembled in a rectangular shape, the strength is weakest at a corner portion of the square, that is, a portion where the frame material is welded. It is effective to make it around the corner. Specifically, from the square corner, 5-15 cm along each frame material
If the peripheral portion of one side of the double-glazed glass (8) and the portion of the window frame (1) abutting on it are adhered and fixed with a double-sided tape (9) or the like, the rigidity of the double-glazed glass (8) can be increased. It works effectively to a practically sufficient degree to reinforce the strength of the corners of the window frame.

Further, in the case of single-pane glass as well as the double-pane glass, the strength of the window frame in the present invention can be reinforced by utilizing the rigidity of the single-pane glass in the same manner as described above.

The peripheral portion of the surface opposite to the one side surface of the laminated glass (8) generally comes into contact with the ridge (11). Even if the peripheral portion of (8) is adhered, it is usually not very effective in reinforcing the strength of the window frame.

[0049]

EXAMPLE An experiment was conducted using a 110 cm long test piece having the cross-sectional shape and dimensions shown in FIG. 4 as a model test piece having a core material. The synthetic resin layer covering the surface of the core material is made of vinyl chloride resin and has a thickness of 1.2 mm.

(1) Manufacture of the test piece of the present invention a) Molding of core material A half-length bamboo bamboo sliced about 14 mm in thickness was placed in a boiling tank, boiled for 20 minutes to soften it, The nodes on the side of the nodes and the outer skin, and the inner skin and the outer skin were concentrically cut off to obtain a bamboo material having a thickness of 10 mm without a convex portion on the surface.

Next, the bamboo material was sandwiched between upper and lower rollers and developed while heating at a high temperature at a set temperature of 140 ° C. to form a flat plate. In addition, during deployment, lateral pressure is applied to bamboo,
The generation of cracks was prevented.

Immediately after the development, water was quenched to stabilize the shape.

From the obtained bamboo plate, a long bamboo plate having a width of 50 mm was made, and these were laminated in five layers using an adhesive to obtain a laminated material of bamboo having a square cross section with a side of 50 mm. This was processed to form a core having the shape and dimensions shown in FIG.

B) Manufacture of test piece The vinyl chloride resin was heated and melted by an extruder, and while gradually reducing the diameter, the thickness was reduced to 1.2 before reaching the die exit.
mm, and the surface of the core material is covered with a synthetic resin by fitting the core material into a hollow portion of the hollow molded product, and the hollow material is covered with a synthetic resin. Extrude outside, cool with sizing device, length 1
It was cut to 10 cm to obtain 29 test pieces of the present invention (hereinafter referred to as "A test pieces").

When the core material was inserted into and integrated with the hollow molded article of vinyl chloride resin, the surface resin temperature of the hollow inner surface of the hollow molded article was about 190 degrees.

(2) Production of test piece using wood as core material Using commercially available cedar and spruce wood, the same cross-sectional shape and dimensions as those of the core material in the above-described test piece of the present invention consisting of a single material. Was formed.

Before processing the core material, the knot portion was punched out and removed.

Using this core material, in the same manner as in the production of the test piece of the present invention, a test piece having a core material of each of cedar and spruce pine (hereinafter, a test piece having a core material of cedar is referred to as a “B test piece” , And the test piece having the core material of Scots pine is referred to as "C test piece".)
Were obtained in each case.

(3) Manufacture of test piece having no core material Conventionally, a commercially available window frame made of vinyl chloride resin having no core material and having a cross-sectional shape and dimensions shown in FIG. Average wall thickness is 2.5mm, cross section is about 29.3 square cm
Is cut into a length of 110 mm and a test piece (hereinafter referred to as “D
19 specimens).

Examples 1 to 3 and Comparative Examples 1 to 4 Ten test pieces of each of A to C were subjected to a temperature of 65 to 70 ° C. and a humidity of 80.
After exposure in a メ ー タ 100% weather meter environment for about 1,000 hours, the synthetic resin layer was tested for partial swelling and crack generation and strength.

1) Evaluation of occurrence of partial swelling and cracking of the synthetic resin layer The A to C test pieces immediately after the above exposure for about 1,000 hours were evaluated based on the criteria in Table 1, and the results were shown in Table 2. It was shown to.

[0062]

[Table 1]

[0063]

[Table 2]

According to Table 2, no partial swelling or cracking of the synthetic resin layer is observed at all in the A test piece, but is considerable in the B and C test pieces.

2) Strength test Ten test pieces A and D each of which were not exposed to the weather meter environment were supported with the distance between both fulcrums set to 100 cm, and a load of 1 kgf was applied to the center to obtain a flexural rigidity. The test was performed. Table 3 shows the results.

According to Table 3, the A test piece has practically almost the same strength as the D test piece, although the cross-sectional area is reduced to about half.

[0067]

[Table 3]

Using nine test pieces A and D, 50
A rectangular window frame of cm × 110 cm was manufactured for each three windows.
On this window frame, a peripheral portion of one side of the double-layer glass constituted by arranging a 3 mm-thick plate glass on both sides of an air layer of 20 mm was adhered and fixed to the window frame using a double-sided tape having a width of 15 mm.

Each of the obtained three-window specimens was supported with the distance between both fulcrums set to 100 cm in the longitudinal direction, and 2 k in the center.
A test of bending rigidity was performed by applying a load of gf. Table 4 shows the results.

[0070]

[Table 4]

According to this, it is constituted by the A test piece,
It is recognized that the strength of the window reinforced by utilizing the rigidity of the double-glazed glass is superior to that of a conventional window fitted with a double-glazed glass constituted by a D test piece.

Example 4 and Comparative Examples 5 and 6 Of the conditions for producing the above A, B and C test pieces,
A ', B', C 'tests under the same conditions except that the surface resin temperature of the hollow inner surface of the hollow molded product when the core material was inserted into and integrated with the hollow molded product of vinyl chloride resin was integrated. Pieces were produced.

When the frame members are combined in a rectangular shape and the adjacent frame members are welded to each other to form a window frame, the core material of the frame material, which is performed as a step prior to the welding, is relatively shifted with respect to the synthetic resin layer. As an evaluation of the difficulty of work, so-called setback work,
When the surface of the frame material is gripped and fixed with an instrument, and a load is applied only to the core material in the length direction of the frame material and pressed, and the core material starts to move relative to the vinyl chloride resin layer Was measured. Five test pieces were prepared under the same conditions, and the average value of the measured values was shown. Table 4 shows the results. According to this, it is found that the A 'test piece having the bamboo core material has a small load value at the time of starting the core material, and the setback operation is easy. Further, when the surface resin temperature of the hollow inner surface of the hollow molded product at the time of integration of the core material and the synthetic resin layer is in the range of 175 to 195 degrees, the load values at the time of starting the core material are all less than 20 kgf, In addition, within this range, the effect of temperature is not observed.

On the other hand, in the B 'and C' test pieces having a wooden core, the load value at the time of starting the core is at least 24.0 kg, and most of the values are close to 30 kgf.
Practically, the setback work is difficult.

The difference between the two is that although the so-called anchor effect of the synthetic resin does not exist in the A 'test piece of the present invention, the B' and C 'test pieces having the wood core material It is recognized that the synthetic resin partially penetrated into the punched nodes and caused an anchor effect, and as a result, the load value at the time of starting the core material was increased.

[0076]

[Table 5]

[0077]

The present invention described above has the following effects.

(1) The invention described in claim 1 has the following various excellent effects.

A) The surface of the window frame is covered with a synthetic resin,
Since no metal is used for the core material, it has high heat insulation and high sound insulation.

B) Since a core made of laminated bamboo is used, unlike a conventional wooden core, there is no hole punched out, and an anchor such as that found in a wooden core. Without effect, a certain degree of relative movement between the core material and the synthetic resin layer is allowed, and unnecessary tensile or shrinkage stress is not applied to the synthetic resin layer portion even when the temperature changes.

Since there is no hole through which the node is punched, the air in the hole does not expand and does not compress the synthetic resin layer.

Therefore, the phenomenon of partial swelling or cracking of the synthetic resin layer, which is a problem in the conventional wooden core material, does not occur.

Further, there is no adverse effect such as a decrease in the strength of the core material due to the intrusion of moisture due to the swelling or crack.

C) When assembling the frame members into a square shape, the process is performed as a pre-process for welding the ends of adjacent frame members.
The work for extending the synthetic resin layer portion at both ends of the frame material in the length direction than the core material portion is easy. That is, since the core material made of laminated bamboo has a small coefficient of friction with respect to the synthetic resin, the core material is tightly attached to the hollow inner wall of the synthetic resin layer so that no gap is formed. By hitting the end with a hammer or pressing with an appropriate tool, the core is moved relatively to the synthetic resin layer so that the end of the synthetic resin layer is longer than the end of the core. It can be easily extended in the vertical direction.

D) Since the laminated material having the strength necessary for practical use is used for the core material, it can be easily made slim. Therefore, space saving and cost reduction during storage and transportation, and design improvement can be achieved.

E) Further, it generally takes 20 to 30 years from the time of planting for trees to become usable as mature trees, but bamboo becomes mature bamboo in only 3 to 5 years. ,
The core material of the present invention can be sufficiently provided.

Therefore, there is no problem of destruction of the natural environment by cutting down trees, and it is extremely significant from the viewpoint of nature protection.

(2) According to the second aspect of the present invention, in addition to the above, the outer skin layer and the endothelium layer having different physical properties are removed.
Since the glulam is formed using a bamboo material consisting of only the intermediate layer, a glulam excellent in uniform physical properties can be obtained, and stable strength can be secured.

(3) According to the third aspect of the present invention, in addition to the above, an operation of assembling a frame material into a rectangular shape to form a window frame can be efficiently performed.

(4) The fourth aspect of the present invention is the first aspect of the present invention.
3. The frame material used in the invention described in 3 can be efficiently formed, and the surface resin temperature at the time of integration is 175 to 19
By setting the temperature range to 5 degrees, it is possible to easily perform a setback operation in which the core material, which is performed as a pre-process of welding when forming the window frame, is relatively shifted with respect to the synthetic resin layer.

(5) According to the fifth aspect of the present invention, since the strength of the window frame is reinforced by utilizing the rigidity of the double-glazed glass or the single-paned glass, it is practically sufficient for a window for a building opening. Can be obtained, and the window frame can be further slimmer.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a synthetic resin window frame of the present invention.

FIG. 2 is a drawing schematically showing a method of coating a synthetic resin layer on a surface of a core material in the present invention.

FIG. 3 is a drawing showing a part of a longitudinal sectional view in which a double-layer glass is fitted into a window frame of the present invention.

FIG. 4 is a drawing showing a cross-sectional shape and dimensions of a test piece used in an example of the present invention.

FIG. 5 is a drawing showing a cross-sectional shape and dimensions of a test piece used in a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin window frame 2 Core material made of bamboo laminated material 3 Synthetic resin layer 4 Frame material 5 Extruder die 6 Sizing device 7 Take-up roller 8 Double glass 9 Double-sided tape 10 Glass receiving stand 11 Edge

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E06B 3/24 E06B 3/24 F term (Reference) 2B250 AA11 DA03 DA04 EA01 EA13 FA01 FA13 FA31 HA01 2E011 CA01 CB03 CC02 2E014 AA03 BA05 BA08 BB01 BC10 BD09 4F100 AJ04 AK01B AK15B AP00A BA02 DD32 EC103 EH172 EH20 GB08 JH01 JJ02 JK01 JL00 JL05 JL09 YY00

Claims (5)

[Claims] 1. A synthetic resin window frame comprising a core material made of laminated bamboo and a frame material obtained by coating the surface of the core material with a synthetic resin layer and assembling these frame materials in a rectangular shape. . 2. A bamboo laminated material formed by using a bamboo material obtained by substantially removing an outer skin layer and an inner skin layer from a three-layer structure of an outer skin layer, an intermediate layer, and an endothelial layer of a raw bamboo. The synthetic resin window frame according to claim 1, wherein 3. At both ends of the frame material, a synthetic resin layer portion uses a frame material extending in a length direction from a core material portion, and the adjacent synthetic resin layer portions are formed by extending the adjacent frame materials. The synthetic resin window frame according to claim 1 or 2, wherein the frame members are connected by welding, and these frame members are assembled into a square to form a window frame. 4. A vinyl chloride resin as a synthetic resin,
The synthetic resin is heated and melted by an extruder to form a hollow molded product having the same cross-sectional shape as a desired frame material while gradually reducing the diameter. The surface resin temperature of the hollow inner surface of the hollow molded product is 17
When the temperature is in the range of 5 to 195 degrees, the surface of the core material is covered with a synthetic resin layer by fitting a core material made of laminated bamboo into the hollow of the hollow molded product. A method for producing a frame material for a synthetic resin window frame, characterized in that: 5. The synthetic resin window frame according to any one of claims 1 to 3, wherein a double-layered glass or a single-paned glass is provided on a peripheral portion of one side of the glass facing the window frame and a window frame portion in contact with the window frame portion. A window for a building opening, wherein the window is at least partially adhered and fixed.