Search

JP-7855906-B2 - Lid materials and containers with lids

JP7855906B2JP 7855906 B2JP7855906 B2JP 7855906B2JP-7855906-B2

Inventors

  • 古▲瀬▼ 清人
  • 渡邉 晃
  • 猪又 暢之

Assignees

  • ＴＯＰＰＡＮホールディングス株式会社

Dates

Publication Date
20260511
Application Date
20220414

Claims (12)

  1. A sheet-like lid material that is joined to the flange of a container having a rectangular opening and a flange formed around the opening, and that seals the opening, A rectangular lid body joined to the flange and closing the opening, A gripping portion located at the corner of the lid body and extending in a first direction from the lid body, A back half cut line is cut into the lid body from the back surface of the lid material toward the front surface of the lid material, The lid material comprises a front half cut line cut into the lid body from the front surface toward the back surface of the lid material , The lid body has a first outer peripheral portion and a second outer peripheral portion that extend in a straight line across the corner portion, The aforementioned back half cut line is, The first back half-cut main line extends in a straight line along the first outer peripheral portion, A second back half-cut main line extends in a straight line along the second outer peripheral portion, A first back half-cut guide line extends from the first outer peripheral side to the first back half-cut main line, which is further than the extension of the first back half-cut main line, It has a second back half-cut guide line that extends from the second outer peripheral side to the second back half-cut main line, which is further than the extension of the second back half-cut main line, The first half-cut guide wire and the second half-cut guide wire extend in directions that move away from each other as they move toward the second direction, which is opposite to the first direction . In the thickness direction of the lid material, the tip of the front half cut line is located on the back side than the tip of the back half cut line. The aforementioned table half-cut line is, Between the first outer peripheral portion and the first back half-cut main line, the first front half-cut main line extends in a straight line along the first outer peripheral portion, Between the second outer peripheral portion and the second back half-cut main line, the second front half-cut main line extends in a straight line along the second outer peripheral portion, A first half-cut guide line extends from the first outer peripheral side to the first half-cut main line, which is further than the extension of the first half-cut main line, The system includes a second half-cut guide line that extends from the second outer peripheral side to the second half-cut main line, which is further than the extension of the second half-cut main line, Lid material.
  2. The first back half-cut guide wire and the second back half-cut guide wire extend in a straight line. The lid material according to claim 1.
  3. The first and second back half-cut guide wires extend in a curved shape. The lid material according to claim 1.
  4. The first half-cut guide wire and the second half-cut guide wire are bent. The lid material according to claim 1.
  5. The gripping portion has a first side portion and a second side portion that extend in the second direction and are arranged in a third direction perpendicular to the second direction, At least a portion of the first side edge is formed by a first full cut line cut from the surface of the lid material to the back surface of the lid material, At least a portion of the second side edge is formed by a second full cut line cut from the surface of the lid material to the back surface of the lid material. The lid material according to claim 1.
  6. The first back half-cut guide wire extends from the vicinity of the tip of the first full cut wire in the second direction to the first back half-cut main wire. The second back half-cut guide wire extends from the vicinity of the tip of the second full cut wire in the second direction to the second back half-cut main wire. The lid material according to claim 5.
  7. The first half-cut guide line and the second half-cut guide line extend in directions that move away from each other as they move toward the second direction. The lid material according to claim 1 .
  8. The aforementioned back half cut line further includes a back half cut auxiliary line extending from the corner end of the first back half cut main line to the corner end of the second back half cut main line. The lid material according to claim 1 .
  9. A hypothetical straight line is defined as a line that passes through the point on the aforementioned back half-cut auxiliary line where the distance to the gripping portion is smallest, and extends in a third direction perpendicular to the first direction. The point where the aforementioned virtual line and the first half-cut guide line intersect is defined as the first reference point. The point where the aforementioned virtual line intersects with the first half-cut main line or the first half-cut guide line is designated as the second reference point. The point where the aforementioned virtual line and the aforementioned second half-cut guide line intersect is designated as the third reference point. When the point where the aforementioned virtual line intersects with the aforementioned second table half-cut main line or the aforementioned second table half-cut guide line is designated as the fourth reference point, The first distance from the first reference point to the second reference point and the second distance from the third reference point to the fourth reference point are 5 mm or less. The lid material according to claim 8 .
  10. The lid material comprises a sealant layer and a paper substrate layer disposed on the surface side of the sealant layer. The lid material according to claim 1.
  11. The sealant layer is made of polypropylene. The lid material according to claim 10 .
  12. A container having a rectangular opening and a flange formed around the opening, A cover material according to any one of claims 1 to 11 , which is joined to the flange and closes the opening, A container with a lid.

Description

This invention relates to a lid material that is joined to a flange formed around the opening of a container, and to a container with a lid to which the lid material is joined. Patent Document 1 describes a lid material that seals the flange around the periphery of a rectangular container opening to close the opening. The lid material described in Patent Document 1 is constructed by laminating a front layer and a back layer in a peelable manner. It includes an opening tab provided at a position corresponding to the corner of the rectangular container opening for opening the lid material, a front half-cut line for cutting the front layer, and a back half-cut line for cutting the back layer. The front half-cut line encircles the rectangular container opening, with both ends reaching both sides of the opening tab. The back half-cut line encircles the rectangular container opening inside the front half-cut line, with both ends reaching both sides of the opening tab. This allows the lid material to be opened by causing delamination between the front half-cut line and the back half-cut line when the opening tab is pulled. However, when the opening tab is pulled, sometimes only the front layer is pulled, causing the front and back layers to delaminate unintentionally. Therefore, the lid material described in Patent Document 1 further includes auxiliary half-cut lines that are cut in the back layer and connected to the two sides that sandwich the opening tab. This allows the delamination between the front and back layers to be stopped at the auxiliary half-cut lines, even if only the front layer is pulled when the opening tab is pulled. Japanese Patent Application Publication No. 2021-095168 This is a plan view showing a container with a lid according to an embodiment.This is a cross-sectional view along the line II-II shown in Figure 1.This is a plan view showing a cover material according to an embodiment.This is a magnified plan view of a portion of the surface side of the lid material.This is a magnified view of the bottom of the lid, showing a portion of the underside.This is a magnified cross-sectional view of a portion of the lid material.This is a plan view corresponding to Figure 4, used to explain the back half-cut line and the front half-cut line.This is a plan view corresponding to Figure 4, used to explain the back half-cut line and the front half-cut line.This is a cross-sectional view showing a container with a lid before it is opened.This is a cross-sectional view showing a container with a lid in an opened state.This is a plan view showing a container with a lid in an open state.This is a plan view showing the lid material of the comparative example.This is a cross-sectional view showing the lidded container of the comparative example before it was opened.This is a cross-sectional view showing the lidded container of the comparative example in its opened state.This is a plan view showing the lidded container of the comparative example in its opened state.This table shows the evaluation results for Example 1 and Comparative Example 1. The embodiments of the present invention will be described in detail below with reference to the drawings. In the following description, identical or equivalent elements will be denoted by the same reference numerals, and redundant descriptions will be omitted. Figure 1 is a front view showing a lidded container according to this embodiment. Figure 2 is a cross-sectional view taken along line II-II in Figure 1. As shown in Figures 1 and 2, the lidded container 1 according to this embodiment comprises a container 2 and a lid material 3. Container 2 has a rectangular opening 21 and a flange 22 formed around the opening 21. A rectangular shape is defined as a shape that can be considered substantially rectangular; for example, a shape with rounded corners is also included. Container 2 is filled with contents 23, such as food. The contents 23 can be removed through the opening 21. The flange 22 is formed in a rectangular shape, similar to the opening 21. Figure 3 is a plan view showing a lid material according to an embodiment. Figure 4 is an enlarged plan view of a portion of the surface side of the lid material. Figure 5 is an enlarged bottom view of a portion of the back side of the lid material. As shown in Figures 1 to 5, the lid material 3 is a sheet-like member that is joined to the flange 22 of the container 2 and closes the opening 21 of the container 2. The surface 3a of the lid material 3 is the surface exposed above the container 1 with the lid, and the back surface 3b of the lid material 3 is the surface joined to the flange 22 of the container 2. Figure 6 is an enlarged cross-sectional view of a portion of the lid material. As shown in Figure 6, the lid material 3 is a laminate in which a sealant layer 31 and a paper substrate layer 32 are laminated together. The sealant layer 31 forms the back surface 3b of the lid material 3 and is joined to the flange 22 o