JPH04284224A - Compressed air and vacuum or compressed air vacuum molding device and its molding method - Google Patents

Abstract

PURPOSE:To provide the compressed air and vacuum or compressed air vacuum molding device which manufactures a molded product of good outer appearance and of simple structure and process and also its molding method by manufacturing even light plastic products such as a neck-in bottle and a triangle flask type by means of compressed air and vacuum or compressed air vacuum molding. CONSTITUTION:A device consists of a top force 1 and a bottom force 15 composed of a body forming side mold 8 and a bottom forming bottom mold 12 moving up and down by means of a lifting means 13. A plastic sheet 16 is compressed air and vacuum or compressed air vacuum molded in a mold consisting of the top force 1 and the bottom force 15 composed of the body forming side mold 8 and the bottom forcing bottom mold 12 moving up and down, and then the top force 1 and the bottom force 15 are mold opened, and said molded product is released out of the bottom forcing bottom mold 12 on which the molded product is placed through its bottom section.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to lightweight plastic products, especially bottles with a stubby body and a neck that is thinner than the body (neck-in-bottle), and Erlenmeyer flask-type bottles that gradually increase in size from the neck to the bottom. The present invention relates to a compressed air and vacuum forming apparatus suitable for molding lightweight plastic products that are becoming increasingly widespread, and a molding method thereof.

0002

[Prior Art] Lightweight plastic products, such as neck-in-bottles and Erlenmeyer flasks, cannot be manufactured using conventional pressurized air, vacuum or pressure-pneumatic vacuum molding because it is difficult to mold them. The only way to manufacture it was by blow molding.

0003

However, plastic products obtained by blow molding have a problem in that vertical lines (parting lines) from the vertically divided mold remain on the surface of the container, impairing the appearance of the container. Further, there were also problems in that the structure was complicated and the process was complicated.

The present invention has been made in view of the above circumstances, and it is possible to obtain lightweight plastic products such as neck-in bottles and Erlenmeyer flasks by compressed air and vacuum or pressure-air vacuum forming, thereby improving the appearance of the molded product. It is an object of the present invention to provide a pressurized air and vacuum forming apparatus and a forming method thereof, which have a good appearance, a simple structure, and a simple process.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the first compressed air and vacuum or compressed air vacuum forming apparatus of the present invention includes an upper die whose position is fixed, and a body which is supported so as to be slidable in the vertical direction. The present invention is characterized in that it includes a lower mold consisting of a side mold for forming a part and a bottom mold for forming a bottom part which is moved up and down by an elevating means.

[0006] Furthermore, the second compressed air and vacuum or compressed air vacuum forming apparatus of the present invention includes an upper mold that is moved up and down by an elevating means, a side mold for forming a body part that is fixed in position, and a bottom part that is moved up and down by the elevating means. It is characterized by comprising a bottom mold for forming and a lower mold.

Furthermore, the first compressed air and vacuum or compressed air vacuum forming method of the present invention includes an upper die whose position is fixed, a side mold for forming a body part that is slidable in the vertical direction, and a bottom part forming bottom part that moves up and down. After the plastic sheet is compressed and vacuum formed in a mold formed by a mold and a lower mold,
The method is characterized in that a side mold for forming a body part and a bottom mold for forming a bottom part are opened with respect to the upper mold, and the molded product is taken out from the bottom mold for forming a bottom part on which the molded product is placed through the bottom part. It is said that

[0008] Furthermore, the second compressed air and vacuum or compressed air vacuum forming method of the present invention comprises an upper mold that moves up and down, a side mold for forming a body part that is fixed in position, and a bottom mold that moves up and down for forming a bottom part. After forming the plastic sheet in a mold formed by a lower mold and a lower mold, the plastic sheet is formed by pressure air and vacuum or pressure air vacuum, and then the upper mold and the bottom mold for forming the bottom of the lower mold are opened, and the molded product is placed through the bottom of the mold. It is characterized in that the molded product is taken out from the placed bottom mold for forming the bottom part.

[0009]

[Function] According to the above-mentioned compressed air and vacuum forming apparatus and its forming method, lightweight plastic products such as neck-in bottles and Erlenmeyer flasks can be easily and reliably obtained.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, an upper mold 1 is a cylindrical body, has a cutter 2 at its lower part, and is fixedly attached to a fixed upper table 3.

A plug 4 is disposed inside the upper die 1 so as to be movable up and down by a lifting means 5 such as an air cylinder (an oil cylinder, a cam device, etc. may also be used). This plug 4
Compressed air is supplied to hose 6 from a compressor (not shown).
It is now sent via . Note that the reference numeral 7 indicates a seal ring.

[0012] Mouth part T of neck-in-bottle T (see Fig. 5)
The side mold 8 for forming the trunk part 1 and the trunk part T2 is supported by a fixed stay 10 via a variable slide stay 9 so as to be slidable in the vertical direction.

A bottom mold 12 for forming the bottom part T3 of the neck-in bottle T is attached to the lower movable lower table 11. It moves up and down using a cylinder, oil cylinder, etc.). This bottom mold 12 for forming the bottom
is connected to a vacuum pump (not shown) via a hose 14. A lower mold 15 is constituted by the side mold 8 for forming the trunk portion and the side mold 12 for forming the bottom portion.

The plastic sheet 16 is fed by a sheet feeder 17. Next, this first
The manufacturing process of molded products in Examples will be described.

FIG. 2 shows that the side mold 8 for forming the body part and the bottom mold 12 for forming the bottom part of the lower mold 15 are opened with respect to the upper mold 1 which is fixed in position, and the heated and softened plastic sheet 16 is fed. It shows a state where it has been moving and has stopped for a while.

Next, as shown in FIG. 3, the movable lower table 11 is raised, and the side mold 8 for forming the body part and the bottom mold 12 for forming the bottom part are aligned, and in this state, the plug 4 is lowered to remove the plastic. The sheet 16 is crushed and deformed.

Next, as shown in FIG. 4, the lower mold 15 consisting of the side mold 8 for forming the trunk and the bottom mold 12 for forming the bottom is closed with respect to the upper mold 1, and the inside of the plug 4 is closed. Air is blown out from the pressure hole, and at the same time, air is sucked through the vacuum hole of the bottom mold 12 for forming the bottom to press the plastic sheet 16 against the side surface of the side mold 8 for forming the body, and also to press the plastic sheet 16 against the top surface of the bottom mold 12 for forming the bottom. It is adsorbed and shaped into a container (the mold is cooled). Thereafter, the movable lower table 11 is slightly raised, and the cutter 2 cuts the plastic sheet 16 above the container.

Next, as shown in FIG. 5, the movable lower table 11 is lowered, and the neck-in bottle T, which is a molded product, is placed on the top surface of the bottom mold 12 and the mold is opened.
After that, blow air from the side to take out the molded product. By the way, the bottom mold 12 for forming the bottom part is moved to the movable lower table 11.
Even if the molded product is lowered together with the bottom mold 12, depending on the type of resin, the molded product may stick to the side surface of the side mold 8 for forming the body portion, and the molded product may not come down together with the bottom mold 12 for forming the bottom portion. In such a case, please input air from plug 4,
The molded product may be dropped onto the bottom mold 12 for forming the bottom by pushing the bottom of the molded product with the plug 4.

The mouth T1, body T2, and bottom T3 of the neck-in-bottle T taken out as a molded product have different wall thicknesses, and the mouth T1 has a thickness of 0.75 mm±0.25.
mm, body part T2 is 0.25mm±0.10mm, bottom part T
3 is 0.40mm±0.15mm. That is, the ratio of the approximate wall thickness distribution of the mouth T1, the body T2, and the bottom T3 is: mouth T1: body T2: bottom T3 = 1:0.3:0
．． It becomes 5.

[0020]The parting line of the neck-in bottle T as a molded product obtained through the above steps is as follows:
Although it is formed at the boundary line between the side mold 8 for forming the body and the bottom mold 12 for forming the bottom, it is formed in the circumferential direction at the lower part of the molded product, so the appearance is greatly improved compared to a vertically divided mold. . The above description also applies to Erlenmeyer flask-shaped containers.

Next, a second embodiment of the present invention will be explained based on FIGS. 6 to 10, and the same components as those in the first embodiment will be given the same reference numerals and redundant explanation will be omitted. .

Explaining based on FIG. 6, the difference between the second embodiment and the first embodiment is that the upper mold 21 integrally includes a cutter 22 and a plug 23; The two points are that the table to which the mold is attached is a movable upper table 24 that is moved up and down by the lifting means 5, and that the side mold 8 for forming the body part is fixed in position by a fixed stay 25. The rest is the same as the first embodiment. That is, the second
The features of this embodiment are that the upper mold is not fixed but movable;
The position of the side mold 8 for forming the body part of the lower mold 15 is fixed.

Next, the manufacturing process of the molded article in this second embodiment will be described.

FIG. 7 shows a state in which the upper mold 21 and the bottom mold 12 for forming the bottom part of the lower mold 15 are opened, a heated and softened plastic sheet 16 is fed, and the plastic sheet 16 is temporarily stopped.

Next, as shown in FIG. 8, the movable upper table 24 is lowered and the plastic sheet 16 is inserted into the plug
Simultaneously with the crushing and deformation, the movable lower table 11 rises, and the three molds, the upper mold 21, the side mold 8 for forming the body part, and the bottom mold 12 for forming the bottom part, are brought together.

Next, as shown in FIG. 9, air is blown out from the pressure hole in the plug 23, and at the same time the bottom mold 1 for forming the bottom is opened.
Suction air from vacuum hole 2 and remove plastic sheet 1
6 is pressed against the side surface of the side mold 8 for forming the body part, and is adsorbed onto the upper surface of the bottom mold 12 for forming the bottom part to form a container shape (
mold is cooled). After that, the movable upper table 24
is slightly lowered, and the plastic sheet 16 is cut by the cutter 22 at the top of the container.

Next, as shown in FIG. 10, the movable lower table 11 is lowered, and the mold is opened with the neck-in bottle T, which is a molded product, placed on the upper surface of the bottom mold 12 for forming the bottom. Remove the molded product by blowing air from the side. By the way, similarly to the first embodiment, the bottom mold 1 for forming the bottom part is
2 is lowered together with the movable lower table 11, depending on the type of resin, the molded product may stick to the side surface of the side mold 8 for forming the body, and the molded product may not come down together with the bottom mold 12 for forming the bottom. be. In such a case, the molded product may be dropped onto the bottom mold 12 by introducing air through the plug 23 or by using the plug 23 of a telescopic type to push the bottom of the molded product. By the time the molded product is taken out from the bottom mold 12, the movable upper table 24
It also rises and returns to its original position.

[0028] Also in the neck-in bottle T as a molded product in this second embodiment, the mouth part T1 and the body part T2 are
The ratio of the approximate wall thickness distribution of the bottom portion T3 and the bottom portion T3 is the same as in the first embodiment. Further, the parting line of the neck-in-bottle T in the second embodiment is also the same as that in the first embodiment, and effects such as improvement in appearance are produced in the same manner as in the first embodiment.

[0029] The model of the molding machine to which the mold can be attached is FK-0431-10 manufactured by Asano Laboratory Co., Ltd.
(pressure-air vacuum forming machine for research and development), FLV341 (pressure-air vacuum forming machine for production), EFI-222 (pressure-air vacuum forming machine for production), etc.

[0030]

[Effects of the Invention] As described above, according to the compressed air, vacuum or compressed air vacuum forming apparatus and molding method of the present invention,
Lightweight plastic products in the shape of neck-in bottles and Erlenmeyer flasks can be obtained with a simple structure and simple process, and
In particular, the molded product placed on the bottom mold for forming the bottom is taken out by dropping it down by gravity or blowing air, etc.
It is easy to take out the molded product, and the appearance of the molded product is improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional front explanatory view of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of the state of the first embodiment of the present invention when the mold is opened before molding.

FIG. 3 is an explanatory diagram of the state of the first embodiment of the present invention when the mold is closed and before molding.

FIG. 4 is a diagram illustrating the state of the first embodiment of the present invention during molding when the mold is closed.

FIG. 5 is an explanatory diagram of the state of the first embodiment of the present invention when the mold is opened after molding.

FIG. 6 is a partially cross-sectional front explanatory view of a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of the state of the second embodiment of the present invention when the mold is opened before molding.

FIG. 8 is an explanatory view of the second embodiment of the present invention in a state before molding when the mold is closed;

FIG. 9 is an explanatory diagram of the second embodiment of the present invention during molding when the mold is closed.

FIG. 10 is an explanatory diagram of the state of the second embodiment of the present invention when the mold is opened after molding.

[Explanation of symbols]

1 Upper mold 4 Plug 5 Lifting means 8 Side mold for body formation 12 Bottom mold for bottom formation 13 Lifting means 15 Lower mold 16 Plastic sheet 21 Upper mold 23 Plug

Claims (4)

[Claims] [Claim 1] An upper mold having a fixed position, a lower mold consisting of a side mold for forming a body part supported so as to be slidable in the vertical direction, and a bottom mold for forming a bottom part which is moved up and down by an elevating means. Compressed air and vacuum or compressed air vacuum forming equipment characterized by. [Claim 2] An upper mold that moves up and down by a lifting means;
A pressurized air and vacuum or compressed air vacuum forming apparatus characterized by comprising a lower mold consisting of a side mold for forming a body part which is fixed in position and a bottom mold for forming a bottom part which is moved up and down by an elevating means. 3. In a mold formed by an upper mold whose position is fixed, a lower mold consisting of a vertically slidable side mold for forming a body and a bottom mold for forming a bottom that moves vertically. After the sheet is compressed air and vacuum formed or compressed air vacuum formed, the side mold for forming the body and the bottom mold for forming the bottom are opened from the upper mold, and the molded product is placed through the bottom to form the bottom. A method for pressurized air and vacuum or pressure and air vacuum forming, characterized in that the molded product is taken out from a bottom mold. 4. The plastic sheet is compressed in a mold formed by an upper mold that moves up and down, a lower mold that is made up of a fixed side mold for forming the body and a bottom mold that moves up and down. After performing vacuum or pressure vacuum forming, the bottom molds for forming the bottom of the upper mold and the lower mold are opened, and the molded product is taken out from the bottom mold on which the molded product is placed through the bottoms thereof. Compressed air and vacuum or compressed air vacuum forming method characterized by: