JPS63221028A - Manufacture of deep vessel of synthetic resin sheet - Google Patents

Abstract

PURPOSE:To cause resin to be heated in a short time and to reduce the defective ratio of products by a method in which after the thermoplastic synthetic resin sheet, in which its side and bottom have been vacuum or pressure molded with a female mold, is punched into a developed shape, it is bent inwardly around the connected part as an axis, and the opposite cut openings are adhered. CONSTITUTION:In a female mold, a plurality of the female molds which can mold a thermoplastic resin sheet 13 into a side part 2 and a bottom part 3 except handles 4 in the state where the opening parts of the deep vessel 1 of two developed shapes are mutually butt-connected integrally, are longitudi nally and transversely recessed. Molding of the thermoplastic synthetic resin sheet 13 such as polypropylene heated with a heating device 14, is continuously effected by a vacuum (or pressurizing) molding machine 12. After molding, molded object is punched into a developed shape containing the handle 4 by a punching machine, and simultaneously the part shown by a two dotted chain line is cut. The deep vessel 1 of the developed shape having been punched, is bent inwardly with the connected part as an axis, and the opposite cut openings 6 are mutually butted and are adhered by heat bonding or other means.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is a method for producing drinks such as juice and other products by vacuum or pressure forming using thermoplastic synthetic resin sheets such as polyethylene, polypropylene, and vinyl chloride. The present invention relates to a method for manufacturing a so-called deep container, which has a larger length in the vertical direction than its inner diameter.

(Prior Art) In general, in the manufacture of deep containers, as shown in FIG. 6, a thermoplastic synthetic resin sheet 13 softened by a heating device 14 is
After molding with a vacuum (or pressure air) molding machine 12 equipped with a female mold 11 and a male mold (plug) 11', the product is manufactured by punching into individual products using a punching machine (not shown).

(Problems to be Solved by the Invention) This method requires a pair of male and female molds, which increases the amount of molding required, and the sheet thickness is 0.5 to 1.5 mm. Since OVA is required, there is a drawback that the heating time is long.

Furthermore, as a result of stretching the flat sheet in the vertical direction by the depth of the deep container with respect to the inner diameter, it has become impossible to avoid uneven wall thickness on the sides of the container. Therefore, it is very difficult to mold, and the defect rate of products tends to be extremely high.

(Means for Solving the Problems) Therefore, it is an object of the present invention to eliminate the drawbacks of the conventional manufacturing methods.

In other words, the bottom part is continuously cut out from the side part, leaving a vertical connection part on the side of the deep food container, and the side part and the bottom part are molded with a female mold into a shape that is developed symmetrically with the connection part as an axis. The gist of this method is to punch out a vacuum- or pressure-formed thermoplastic synthetic resin sheet into the expanded shape, then bend it inward around the connecting portion, and adhere the opposing incisions.

(Function) Since the sheet is formed into an expanded shape with the connecting portion as the axis, it is only necessary to squeeze half of the inner diameter, so it is possible to draw shallower than before, and a thin sheet can be formed uniformly.

After molding, the desired deep container can be manufactured by bending the container inward around the connecting portion, joining the opposing openings, and bonding by heat bonding or other means.

(Effects) Because the aperture is shallow, it can be formed using only a female mold, reducing the amount of molding by half. In addition, since it can be formed into a thin sheet of about 0.3 mm, it can be heated in a short time, making it possible to form a sheet and reduce electricity costs. Furthermore, the side wall thickness can be molded to be uniform, which eliminates product defect rates.

Furthermore, with conventional deep containers, it was not possible to print on the sides without using a curved surface printing machine, but it can be molded by hand.

With conventional methods, deep containers with handles could not be manufactured, but with this method, they can be manufactured easily.

(Example) First, a cup-shaped deep food container 1 with a handle in an unfolded shape will be explained with reference to FIG.
3 is a bottom, 4 is a handle, 5 is a connecting portion indicated by a dashed-dotted line, and 6 is an opening indicated by a thick solid line.

As shown in FIG. 1, the deep food container 1 in the unfolded shape extends left and right from the side 2 to the bottom 3 along the central longitudinal section (i.e., plane of symmetry) passing through the handle 4 of the product deep food container A. It is cut out symmetrically, leaving the side opening 6 and the side portion radially opposite the side portion as the connecting portion 5.

As shown in FIG.
With the openings of the two unfolded deep food containers 1 abutted against each other and connected, a plurality of female molds capable of forming the side parts 2 and the bottom part 3, excluding the handle 4, are recessed vertically and horizontally. ing. As shown in FIG. 5, a thermoplastic synthetic resin sheet 13 such as polypropylene is continuously molded using a vacuum (or compressed air) molding machine 12 equipped with the female mold 11. 14 is a heating device.

After forming, it is punched out using a punching machine (not shown) into the developed shape of FIG. 1, including the handle 4, as shown in FIG.

At the same time, cut the part indicated by the two-dot chain line in the figure.

The punched and unfolded deep food container 1 is bent inward about the connecting portion, and the opposing openings 6 are joined together and bonded by thermal bonding or other means.

In the above embodiment, the diameter is equal from the opening to the bottom.
We have explained how to manufacture cylindrical deep containers with handles, but we can also manufacture containers without handles, bottles for alcohol, jelly, medicine, etc., and other containers that are conical, have a constriction, or have a polygonal cross section. We can also manufacture products such as

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the deep food container in an expanded form, and FIG. 2 is a perspective view of the product deep food container. FIG. 3 is a perspective view of the formed sheet, and FIG. 4 is a deep container in an expanded shape punched out from the formed sheet by a punching machine, and shows the state before cutting the abutted openings. FIG. 5 is a schematic front view showing a means for forming a deep container, and FIG. 6 is a schematic front view showing a conventional forming means. A...Deep container for the product l...Deep container in unfolded shape 2...Side part 3...Bottom part 5...Connection part 6...Cut opening 11 ...
・Female mold 12...Molding machine 13...Sheet agent Masaharu Yamagami, patent attorney Figure 1 Figure 2 Figure 6 Figure 4 Bottom procedure amendment March 23, 1988 Synthetic resin Method for manufacturing deep food containers using sheets 3 Relationship with the case of the person making the amendment Patent applicant address 2341-4 Tamashima Agazaki, Kurashiki City, Okayama Prefecture Attorney 5 Date of amendment order Voluntary action 6 Symptom of the amendment As shown in the attached sheet 7 Contents Page 4, lines 5 to 6, “It could not be done, but it can be molded.” is replaced with “It could not be done, but with the manufacturing method of this invention, it is printed on a flat sheet in advance before molding. If you put it in place, you can form a deep container with a print on the side.''that's all

Claims (1)

[Claims] (1) Leaving a vertical connecting part on the side of the deep food container, cut the bottom part continuously from the side, and mold the side and bottom parts into a female mold to form a shape that unfolds symmetrically around the connecting part as an axis. Manufacturing a deep container using a synthetic resin sheet made by punching out a thermoplastic synthetic resin sheet vacuum- or pressure-formed into the expanded shape, bending it inward around the connection part, and gluing the opposing openings. Method.