JP3241128B2 - Water pillow manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a water pillow.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional water pillow first places an unvulcanized rubber sheet 100 on a lower die 400, and then sets a core 300 having the same planar shape as the product. At the same time, an unvulcanized rubber sheet 101 is placed on the upper surface of the core 300, and the upper die 500 is pressed and vulcanized.

[0003]

However, the water pillow made of the above-mentioned prior art can be used to take out the core 300 from the mouth 200 as the outlet of the core 300.
200 has to be forcibly stretched to the outer dimension of the core 300 (in the direction of the arrow 600). This removal work is not only troublesome and requires a lot of labor, but also when removing the core 300, the molded product (especially the mouth portion 200) is taken out. There was also a risk of damage (see FIG. 8).

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to easily and reliably manufacture a water pillow without using a core.

[0005]

In order to achieve the above-mentioned object, a technical means of the present invention is to form upper and lower sheet materials having substantially the same shape as a plane shape of a water pillow, and to form an inner surface of each sheet material. Attaching the peripheral portions together, forming an air injection port at the front end portion in front of the mouth portion forming position to form a flat bag body, and then setting the flat bag body in a lower mold, and A desired amount of air is injected into the bag to temporarily inflate the bag to a desired degree, then the upper and lower molds are combined, and then air is injected into the bag to inflate the inside of the mold completely and heated. The outer surface of the bag body is brought into contact with the inner surface of the molding die, and the mold is vulcanized to form the bag.

In addition, before setting the flat bag body in the lower mold of the molding die, the flat bag body is set in a preliminary mold, and air is previously injected into the bag body in the preliminary mold to form a substantially product shape. Is also good.

[0007]

According to the technical means described above, the flat bag set in the mold is fully expanded in the mold by the air injected through the air inlet, and comes into contact with the inner surface of the mold being heated. It is vulcanized and molded into a mold.

In addition, if the flat bag is set in the preliminary mold before the flat bag is set in the lower mold, the bag is adapted to the final product shape by injecting air into the approximate shape. And in a mold vulcanizing step in a molding die, it can be expanded in a short time until it comes into close contact with the mold.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for producing a water pillow according to the present invention will be described below. A flat bag 2 is formed from sheet materials 1 and 1, and then the bag 2 is set in a desired mold 3. Then, air is once injected into the flat bag body 2 to slightly inflate the flat bag body 2. Thereafter, the upper and lower molds 3a and 3b are combined, and then air is injected to form the heated mold 3
a, 3b on the inner surface 3a ', 3b'
Are brought into contact with each other and vulcanized in a mold, and then demolded, and finally the mouth 8 is formed.

First, to form the flat bag body 2, two unvulcanized sheet materials 1, 1 having a plane shape substantially similar to the plane shape of the water pillow A, which is a molded product made of rubber, resin, etc., are formed. Then, the adhesive 6 is applied to the inner peripheral edges 1a, 1b of the unvulcanized sheet materials 1, 1 and then pressed to press the inner peripheral edges 1a, 1b.
b are bonded to each other with a desired width. In addition, a front end portion 10 (longitudinal end portion) in front of the mouth portion forming position 9 in a portion where the inner peripheral portions 1a and 1ba are bonded to each other.
Is provided with an air injection port 1c communicating with the internal space 1d (bag forming step, see FIG. 1.2).

According to the present invention, reference numeral 11 in the drawing denotes a middle suspension, and if the upper end 11a and the lower end 11b are pasted to desired positions on the inner surfaces of the sheet materials 1 and 1 according to the present invention, the vulcanization will be described later. There is an advantage that at the time of molding, the attached portion is vulcanized and can be integrally molded. Also, the inner peripheral portions 1a, 1b,...
The way of lamination is arbitrary and is not limited to the illustrated example. In lamination, a special adhesive is not required and is not limited at all. (The above-mentioned adhesive is a so-called adhesive. Is also included).

The formed bag 2 is first set in the recess 4 of the lower die 3b, and a desired amount of air (x 'in FIG. Shown)
And pre-expanded to a desired degree (pre-expansion step, see FIG. 3).

The molding die 3 comprises a concave portion 4 of an upper die 3a and a lower die 3
The molded portion 7 is formed with the concave portion 4 of b, and the width of the concave portion 4 is substantially the same as the width of the bag body 2. In the figure, reference numeral 5 denotes an air circulation groove communicating with the air injection port 1c. The mold 3 is heated to a desired temperature in advance.

Thereafter, the lower mold 3b and the upper mold 3a in a state where the bag 2 is set are polymerized, and the bag 2 is set in the molding section 7. At this time, the air injection port 1c of the flat bag body 2 and the air flow groove 5 of the molding die 3 are arranged in the same line so as to communicate with each other, and the adhesive portions 1a 'and 1b' are sandwiched by the peripheral portions 3a "and 3b". Then, after molding, the pinched portion is deleted as burrs.

Then, the mold 3 is compressed by a press vulcanizer or the like and heated at a desired temperature, and a pressure of 5 to 6 kgf / cm from the air flow groove 5 through the air injection port 1c.
² (indicated by an arrow x) is forcibly injected into the internal space 1d of the flat bag 2, and the bag 2 is fully inflated in the molding die 3 (in the molding portion 7) (see FIG. 4). ).

Accordingly, the bag body 2 is inflated by air, and the outer surface 2a comes into contact with the inner surfaces 3a and 3b of the molding die 3 to be vulcanized into the shape of the molding portion 7. In addition, it is preferable to supply heated air in the air injection step because hot air is vulcanized from the inside to shorten the vulcanization time. In addition, it is preferable that the pressurized air be released from a desired time before the completion of molding to prevent swelling of the molded article at the time of demolding.

The mouth portion 8 is formed by cutting with a pair of scissors, a cutter, or the like at the mouth portion forming position 9 of the molded product after the vulcanization step, and removing the portion 14 provided with the air injection port 1c. .

As shown in FIG. 6, the mouth 8 is provided with a core 12 having a desired shape around the mouth 9 where the sheet 1 is formed when the bag 2 is formed. And the inner surface 3 of the mold forming the vicinity of the mouth of the upper mold 3a and the lower mold 3b.
Desired blades 13 and 13 may be formed on c 'and 3c' and cut at the time of vulcanization molding, and at the same time, the mouth portion may be treated (cut) (cutless type). However, since the portion 14 where the air injection port 1c is cut at the opening forming position 9 is cut, even if a defect appears in the injection port 1c during vulcanization molding, there is no problem. Things. In addition, the above-mentioned core 1
2 is different from the conventionally used core for water pillow molding,
The mouth portion 8 can be taken out together with the formation of the mouth portion 8 without expanding the mouth portion 8, and the mouth portion 8 is not damaged.

Further, the flat bag 2 is set before the flat bag 2 is set in the lower mold 3b in the molding method.
Is set in a desired preliminary mold (not shown), and air is injected into the aforementioned bag 2 in the preliminary mold to form a flat bag 2 in a shape close to a substantially product shape in advance, and then the flat The bag 2 is set in the molding die 3 and pre-expanded and vulcanized. There is a merit that the shape of the product can be brought out well by adapting it to the product in advance.
The material is not limited at all, such as resin or gypsum, and is arbitrary.
The other configuration is the same as that of the first aspect, and the description is omitted.

[0020]

The method of molding a water pillow according to the present invention has the above-mentioned structure and does not use a core. Thus, the water pillow can be formed easily and reliably, and as a result, the working efficiency can be improved and the labor of the worker can be reduced, which is very useful.

Further, when a flat bag formed by laminating the peripheral edges of the upper and lower sheet materials is set in a lower mold and directly vulcanized and molded, heat is applied from the lower mold to the product before setting the upper mold. According to the present invention, a step of injecting a desired amount of air into the bag set in the lower mold and inflating the bag once is performed according to the present invention before the vulcanization molding step of the bag. Therefore, the above problem does not occur, and the product is very good.

In addition, before the flat bag body is set in the forming mold, air is injected into the preliminary mold to form the product into a substantially product shape. Since it expands in a mold vulcanizing step in a molding die until it comes into close contact with the mold in a short time, there is no fear of air leakage.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention, showing a part of a flat bag molding step.

FIG. 2 is an exploded perspective view showing a state where a flat bag is set in a molding die.

FIG. 3 is a sectional view showing a pre-expanded state.

FIG. 4 is a sectional view showing a vulcanization molding state.

FIG. 5 is an overall perspective view showing one embodiment of a water pillow, showing a state in which a mouth portion is formed.

FIG. 6 is a longitudinal sectional side view showing another method of forming a mouth portion.

FIG. 7 is a partially enlarged sectional view showing a conventional molding method.

FIG. 8 is a perspective view showing a core removal state in a conventional molding method.

[Explanation of symbols]

A: Water pillow 1: Sheet material 1a, 1b: Inner peripheral edge 1c: Air inlet 2: Flat bag 2a: Bag outer surface 3: Mold 3a: Upper die 3b: Lower die 3a ', 3b': Mold inner surface 8 : Mouth 9: Mouth forming position 10: Tip

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B29L 31:00 B29L 31:00

Claims (2)

(57) [Claims] 1. An upper and lower sheet material having substantially the same shape as the planar shape of a water pillow is formed, and the inner peripheral edges of the respective sheet materials are bonded together, and an air injection port is provided at a front end portion in front of a mouth portion forming position. Forming a flat bag, then setting the flat bag in a lower mold, and injecting a desired amount of air into the bag to once pre-inflate the bag to a desired degree, After that, the upper and lower molds are put together, and air is injected into the bag to expand the inside of the mold as much as possible.
A method for producing a water pillow, wherein the water pillow is formed by bringing the outer surface of the bag body into contact with the inner surface of a heated mold and vulcanizing the mold. 2. A flat bag body is set in a preliminary mold before being set in a lower mold, and air is previously injected into the bag body in the preliminary mold to form a substantially product shape. The method for producing a water pillow according to claim 1, wherein: