JPH047082Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the lid of a food container, which is used as the top lid of a container that stores and seals the contents, such as canned food, but is also applicable to other ordinary containers. It can also be used as a lid for food containers.

[Conventional technology]

Conventionally, as a lid for such a food container, as in Utility Model Publication No. 58-9888, a receiving rim of approximately the same thickness is integrally formed on the inner periphery of a lid frame made of synthetic resin, and this receiving rim is and a plurality of retaining claws provided above, with a display sheet inserted between them, or Jikkosho 57
As in No. 32122, it is known that the periphery of the display sheet is integrally welded to the upper surface of the receiving edge using a resin welding agent.

According to such a configuration, the former is used to fit the display paper, and the latter is made of paper made of a single material, so the fitted or welded display paper is free from humidity and other causes. Even if it expands or contracts, it will be adjusted and no unevenness will occur on the surface of the display sheet.

[Problems that this proposal seeks to solve]

However, in recent years, in order to improve the strength, airtightness, moisture-proofing and waterproofing properties of display sheets, sheets with a resin film such as polyethylene or polypropylene integrally laminated on the underside are often used.

If the peripheral edge of such a two-layered display sheet is welded to the conventional receiving edge, which has the same thickness as the lid frame and is integrally molded and fixed thereto, as described above, the display sheet will not be displayed. The shrinkage force caused by the resin thin film on the bottom surface of the paper sheet cooling and shrinking in the direction of the flow of the resin after welding, and in the turbulent direction as a whole, is not absorbed at all at its periphery.
Inevitably, forces such as shrinkage and elongation act on the central portion of the display sheet, causing distortion. This contraction and expansion is extremely minute, and at one end in the radial direction, approximately
Although the movement is within 0.2 mm, this can cause the surface of the display sheet to bulge or become undulating, and in extreme cases, the entire lid, including the lid frame, may become twisted. It was hot.

Furthermore, when the paper material contains a large amount of moisture, only the surface paper material stretches, resulting in wavy unevenness on the surface of the display sheet.

The present invention solves this problem, and even if the display sheet with a two-layer structure of paper material and a resin thin film is welded to the receiving edge, the surface will not be deformed or the entire lid will not be twisted, and the paper on the surface will not be distorted. To provide a lid for a food container that does not undergo deformation due to moisture absorption of the material.

[Means for solving problems]

The food container lid of the present invention is a synthetic resin lid that has a lid frame with a fitting rim at the bottom and a receiving rim of an appropriate width on the inner periphery of which is lowered one step. , the receiving edge is integrally connected with the inner periphery of the lid frame with a thin buffer part interposed therebetween, and is tilted upward toward the center, and is made of two layers: a resin thin film surface and a paper material. It is characterized in that the resin thin film surface of the display sheet is welded only to the upper surface of the receiving edge.

[Effect]

Since the receiving edge is made to move with a thin buffer between it and the lid frame, when the thin resin film of the welded display sheet contracts, the receiving edge is subjected to contractile force in random directions as a whole. moves minutely to absorb and buffer the contraction force. In this case, the receiving edge deforms extremely minutely in that direction and absorbs and eliminates the contraction force, so that no distortion occurs in the central portion of the display sheet.

Therefore, the surface of the display sheet does not become undulating or bulge, and the entire lid including the lid frame is completely prevented from twisting.

In addition, the receiving edge slopes upward toward the center of the lid, bulges the display sheet toward the center, and holds the paper in a shape that maintains its surface tension, even if the paper contains a large amount of moisture. No unevenness occurs on its surface.

〔Example〕

Hereinafter, drawings showing one embodiment of the present invention will be specifically described.

Reference numeral 1 is a lid frame made of synthetic resin, which has a peripheral edge 2 at the bottom that fits into the container (double-dashed line in the figure), and a receiving edge 3 of an appropriate width that is lowered one step on the inner periphery. In the present invention, a thin buffer section 4 is interposed between the receiving edge 3 and the lid frame 1, and these are integrally connected.
Further, a rib 5 is provided protrudingly on the inner upper surface of the receiving edge 3 so that the receiving edge 3 is tilted upward toward the center of the lid.

As shown in FIG. 4, the display sheet 6 is made by laminating a thin resin film 8 on the lower surface of the paper material 7, and welding this thin resin film only to the upper surface of the receiving edge 3 by ultrasonic welding or other means. The portion beyond the edge is not welded to the lid frame 1.

In the above, the buffer part 4 is provided on the lower side to support the receiving edge 3 as shown in FIG. 4, and is also provided above so as to suspend the receiving edge 3 as shown in FIG. Good too. Further, numeral 9 in the figure is a spoon provided between the receiving edges 3 via a thin buffer connecting piece 10.

Since the receiving edge 3 is held by the thin buffer section 4 and made to move in this way, even if the resin thin film 8 on the lower surface of the display sheet 6 welded to the receiving edge 3 contracts in the direction of flow, In response to this contraction, the receiving edge 3 moves minutely in that direction and deforms while absorbing the contraction force, so that no distortion occurs in the central portion of the display sheet 6.

Therefore, the surface of the display sheet 6 does not become undulating or bulge, and the entire lid including the lid frame is completely prevented from being twisted.

In addition, even if the paper material 7 on the surface of the display sheet contains a large amount of moisture and stretches, the display sheet 6 will swell in the center of the lid as shown in FIG. 1 and assume a shape that maintains surface tension. Therefore, the paper material 7 on the surface will not stretch and cause unevenness.

In this proposal, the shape of the lid does not matter whether it is circular or square, and the thing connected between the receiving edges may be any tool for taking out food, such as a spoon, fork, toothpick, etc. This proposal can be applied even if they are not installed consecutively.

〔effect〕

As mentioned above, according to the present proposal, a thin buffer section is interposed on the inner periphery of the lid frame and a receiving edge is provided in succession to make the receiving edge moveable, and a thin resin film is welded only to the upper surface of this receiving edge. Since the shrinkage force of the resin thin film after molding is absorbed and canceled by the receiving edge, the display paper sheet can be displayed without causing any deformation such as unevenness or bulges on the surface of the display paper sheet or twisting of the entire lid. It has the effect of always keeping the plane flat. In addition, since the receiving edge is tilted upward toward the center to maintain the surface tension that causes the display sheet to bulge toward the center, even if the paper material contains moisture, wavy irregularities will not occur on its surface. It has the effect of preventing

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a side view of the lid, Fig. 2 is a bottom view, Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2, and Fig. 4 is an enlarged cross-section of the main part. FIG. 5 is an enlarged sectional view of another configuration. 1... Lid frame, 2... Fitting periphery, 3... Receiving edge, 4
... Buffer part, 6 ... Display paper leaf, 7 ... Paper material, 8 ...
...Resin thin film.

Claims (1)

[Scope of Claim for Utility Model Registration] In a lid made of synthetic resin that has a lid frame with a fitting peripheral edge at the bottom and a receiving edge of an appropriate width on the inner periphery of which is lowered and integrated. , The receiving edge is integrally connected to the inner periphery of the lid frame with a thin buffer part interposed therebetween, and is tilted upward toward the center, and is made of two layers: a resin thin film surface and a paper material. A lid for a food container, characterized in that the resin thin film surface of the display sheet is welded only to the upper surface of the receiving edge.