JPH02225330A - Production of pot lid made of glass - Google Patents

Abstract

PURPOSE:To obtain a sanitary pot lid, made of glass and having excellent see-through properties at a low cost by pressing flat glass with a heat-resistant shaping roller and heat-resistant nip roller in a specific mode, then heating and curving the pressed flat glass with a forming machine. CONSTITUTION:Flat glass 1 is rotatably mounted at the center thereof on a fulcrum and a shaping roller 2 is freely rotatable and simultaneously has a structure capable of moving and pressing to the peripheral part 4 of the flat glass 1. The peripheral part 4 of the flat glass 1 is heated with a heater. The shaping roller 2 is subsequently moved to the side of a the peripheral part 4 of the rotating flat glass 1 to bring a corner part 7 which is a boundary between the first recessed part 5 and the second recessed part 6 of the shaping roller 2 into contact with the center of the thickness of the peripheral part 4 and carry out gradual pressing. After the shaping, the shaping roller 2 is withdrawn and a nip roller 10 is brought near the peripheral part. The first roll (10a) and the second roll (10b) of the nip roller 10 are moved so as to nip the peripheral part 8 of the deformed flat glass. The first roll (10a) is slowly pressed downward. The flat glass is then wholly curved in a hot-pressing type forming machine and worked into a pot lid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a glass pot lid that allows the contents inside the pot to be seen through.

[Conventional technology]

When making stews in a pot, it is convenient for the cook to be able to see the contents from the outside.

Therefore, attempts have been made to make pot lids made of glass, and various glass pot lids have been put into practical use.

Conventional glass pot lids include:

(1) A disk-shaped plate glass is curved and a metal frame with a 6- or 0-shaped cross section is fitted around its periphery.

(2) A metal pot lid with a plate glass fitted into a portion (mostly the center).

(3) The entire lid is molded from glass.

[Problem that the invention seeks to solve]

However, the conventional glass pot lid as described above has the following problems, including the manufacturing method thereof.

(1) A glass pot lid with a metal frame fitted around the periphery of a curved plate glass has good transparency and the 12-year manufacturing process is simple; This infiltrates into the fitting part, which is difficult to remove by ordinary cleaning, and remains as a stain, resulting in an unsightly appearance and also poses a hygiene problem.

(2) A metal pot lid with a plate glass fitted into the center has the disadvantage that the viewing range is narrow and the entire contents cannot be seen; There was a problem with the joints becoming unhygienic.

(3) A lid made entirely of glass is clean and hygienic, but because it is molded in a mold, it is not possible to make the glass surface completely smooth.

There was a drawback that the contents appeared distorted when viewed from the outside. In addition, the periphery of the lid must be molded into a special shape so that the lid fits well on the edge of the pot.

Another problem was that the mold became complicated, which increased manufacturing costs. Furthermore, when molded with a mold.

Since later strengthening treatment becomes difficult, the product has to be manufactured using unstrengthened glass, and in order to have practical strength, the thickness of the glass must be increased, which also has the disadvantage of making the lid heavier. there were.

The present invention was arrived at as a result of studies to eliminate the drawbacks of the prior art, and its purpose is to provide a method for manufacturing a glass pot lid that is hygienic, has good transparency, and can be obtained at low cost. It is in.

[Means for solving problems]

In order to achieve the above object, the present invention takes the following measures.

(1) The peripheral edge of a plate glass formed into a disk shape is softened by heating.

(2) A heat-resistant forming roller having an appropriately shaped recess on the side of the roll and freely rotating is provided facing the peripheral edge of the glass sheet, and softening is achieved by heating the surface of the glass sheet corresponding to the open end of the recess. In this state, the peripheral edge of the glass plate is pressed toward the center by the forming roller while the glass plate side rotates or the forming roller side revolves along the peripheral edge of the glass plate.

(3) Next, the peripheral edge of the plate glass is pressed in the thickness direction with a heat-resistant nip roller consisting of two rolls.

(4) Thereafter, the sheet glass is heated and bent using a molding machine.

[For production]

By heating the peripheral edge of the plate glass formed into a disk shape, the peripheral edge is uniformly softened. Then, by rotating (rotating) the plate glass side or rotating (revolving) the forming roller side along the peripheral edge of the plate glass, the softened peripheral edge is pressed toward the center by the forming roller. The peripheral edge is shaped into the shape of the recess of the forming roller, but the surface of the sheet glass corresponding to the open end of the recess is heated and softened, resulting in a gap between the surface of the sheet glass. The peripheral edge can be smoothly shaped into the shape of the recessed part of the shaping roller. Since the X-shaped roller is freely rotatable, the periphery of the rotating glass plate is uniformly shaped. However, at this time, the edges of the molten glass tend to become rounded due to surface tension, which tends to be less than 1%, and the entire plate glass tends to wave.

By pinching the peripheral edge of such a glass plate with a nip roller without rotating it, the waving of the glass plate is corrected, the direction of melting at the tip is corrected, and the thickness is restored to its normal thickness.

The entire plate glass is then heated and bent into the shape of a pot lid using a press-forming machine.

Furthermore, in order to make the glass stronger, it is strengthened by applying a strengthening treatment (for example, chemical strengthening, water mist strengthening, air strengthening).

[Example] Figures 1 to 4 show the first embodiment of the present invention. The manufacturing method of the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of a disc-shaped plate glass 1 and a forming roller 2. The plate glass 1 is a plate glass with a thickness of 1 to 1 m, cut into a circular shape, and has a small hole 3 in the center for inserting a knob. It is set up. The plate glass 1 is rotatably mounted around the center as a fulcrum, and the forming roller 2 is configured to be freely rotatable and to be able to move and press toward the peripheral edge 4 of the glass plate 1. In addition, the second forming roller 2, which will be described later,
The burner 13 is connected to the plate glass 1 in correspondence with the opening end of the recess 6.
It is arranged toward the periphery of the Furthermore, the peripheral edge 4 of the glass plate 1 is heated by a heater (1ull shown in the front).

FIG. 2 is a sectional view showing a state in which the forming roller 2 is pressed against the peripheral edge 4 of the glass plate 1 to form a fic shape.

In this example, the side surface of the forming roller 2 has a deep first recess 5 and the aforementioned shallow second recess 6. First, the forming roller 2 is moved to the side surface of the peripheral edge 4 of the rotating plate glass 1,
The corner 7 of the forming roller 2, which is the boundary between the first recess 5 and the second recess 6, is brought into contact with the center of the thickness of the peripheral edge 4 and gradually pressed. Then, the softened peripheral edge 4 is deformed to form a head 8 that rises at the top and legs 9 that hang down at the bottom.
is provided, the surface of the temporary glass 1 corresponding to the opening end of the second recess 6 is softened through the heating action of the burner 13, and the plate glass l is softened in the process of forming the leg portion 9. It can be shaped without creating a gap between it and the surface.

Once the head portion 8 and the leg portions 9 are formed on the entire circumference, the forming roller 2 is retracted, and then the nip roller 10 is brought close to the circumference.

FIG. 3 shows a situation in which the edge is held between the nip rollers 10.
A and the 20th rule 10b are moved so as to sandwich the head 8 of the peripheral edge of the deformed glass plate, and the 10th rule 10a is gradually pressed downward. As a result, the bulge in the head 8 is corrected, and at the same time, the distortion and waving of the entire glass plate are corrected.

Thereafter, the plate glass 1 is molded using a hot press molding machine (8 in front of the figure).
121), the whole is curved and processed into the pot lid shown in FIG.

When this product is to be strengthened, it can be subjected to the usual tempering treatment for tempered glass, which involves rapid cooling from a high temperature state.

The pot lid shown in Fig. 4 obtained in this example is what is called a double type in the industry, and when it is placed over a pot, the legs 9 go inside the pot and the head 8 rests on the edge of the pot and covers it. become a state.

5 to 7 show a second embodiment.

As shown in FIG. 5, the forming roller 2 of this example has a recess 11 on the side surface of the roll, which is rounded at the back and has a U-shaped cross section. Further, although not shown, a pair of upper and lower burners are disposed toward the peripheral edge of the glass plate 1 in correspondence with the open end of the recess 11.

Therefore, when this concave portion 11 is pressed against the peripheral edge 4 of the heated and softened glass plate 1, the peripheral edge 4 forms a round white bead portion 12 without creating a gap with the surface of the glass plate 1. Thereafter, the upper surface of the white bead part 12 is slightly flattened by pressing particularly the upper part of the white bead part 12 as shown in FIG.

The plate glass whose peripheral edge has been processed in this manner is bent using a hot press molding machine to obtain a pot lid as shown in FIG. 7.

The pot lid obtained in this example is called a single type in the industry and is used for pots with a step on the edge of the pot.
The lid will rest on the step of the pot.

The lid of this embodiment can also be made of tempered glass by subjecting it to a strengthening treatment.

In the above embodiment, the forming roller is pressed against the periphery of the plate glass while rotating (rotating), but the forming roller and burner are pressed at the same time while rotating (revolving) along the periphery of the plate glass. It is also possible to press the peripheral edge of the sheet glass with a forming roller.

〔Effect of the invention〕

The present invention has the following effects.

(1) Since no metal is used, it can be completely cleaned, and there is no accumulation of broth, making it beautiful and hygienic.

(2) Because it is made from plate glass, it has extremely good transparency.

(3) It can be done at low cost because it only requires processing plate glass.

(4) It is easy to strengthen and is lightweight because thin temporary glass can be used.

(5) The peripheral edge of the glass plate can be shaped without creating a gap with the surface of the glass plate.

That is, if the burner is arranged toward the peripheral edge of the glass sheet in correspondence with the opening end of the recess of the forming roller as described above, and the burner does not heat and soften the surface of the glass sheet corresponding to the opening end of the recess. , as shown in both FIGS. 8 and 9, the surface of the glass plate 1 corresponding to the open end of the recess is not sufficiently softened, so that the gap between the base of the leg 9 and the glass plate 1. A gap 14 is created in the gap 14, and the wall thickness becomes thinner by the gap 14, which reduces the strength of the leg portion 9. In addition, the boiling liquid will enter the gap 14 and become dirty. In the present invention, the surface of the glass plate 1 corresponding to the open end of the recess is heated and softened, and the JR edge 4 of the glass plate 1 is pressed toward the center by the forming roller 2. Shaping can be performed without creating such a gap 14.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment, the upper figure is an overall plan view, Figure 2 is a sectional view of the forming roller, burner, and peripheral area, and Figure 3 is a cross-sectional view of the nip roller and peripheral area. A sectional view, FIG. 4 is an overall sectional view, and FIGS. 5 to 7 show a second embodiment,
Figure 5 is a cross-sectional view of the forming roller and the peripheral edge, Figure 6 is a cross-sectional view of the nip roller and the peripheral edge, Figure 7 is an overall cross-sectional view, and Figure 8 shows the surface of the sheet glass corresponding to the opening end of the recess. FIG. 9 is an overall cross-sectional view showing a state in which a gap occurs when the material is not sufficiently heated and softened, and FIG. 9 is an enlarged view of the main part. DESCRIPTION OF SYMBOLS 1... Plate glass, 2... Shaping roller 3... Small hole, 4... Peripheral part, 5... First recessed part, 6... Second
recess, 7... corner, 8... head, 9... leg, 1
0... Nip roller 11... Concavity, 12...
Meat ball part, 13... Burner, 14... Gap. Patent applicant: Materials Industry Co., Ltd. Attorney: Toshio Tamakoshi

Claims (1)

[Claims] (1) The peripheral edge of the plate glass to be formed into a disk shape is softened by heating, and then a heat-resistant forming roller that freely rotates with an appropriately shaped recess formed on the side of the roll is placed opposite to the peripheral edge of the plate glass. At the same time, the surface of the plate glass corresponding to the opening end of the recessed portion is softened by heating, and while the plate glass side is rotated or the forming roller side is revolved along the peripheral edge of the plate glass, After pressing the peripheral edge of the glass plate toward the center using a molding roller, and then pinching the peripheral edge in the thickness direction using a heat-resistant nip roller consisting of two rolls, the glass plate is heated in a molding machine. A method for manufacturing a glass pot lid characterized by curving it.