Plant fiber molding cup cover with anti-loosening inner protruded strips and method for manufacturing inner protruded strips

Abstract

The invention relates to a plant fiber molding cup cover with anti-loosening inner protruded strips and a method for manufacturing the inner protruded strips. The purpose is that the cup cover can be in close contact with an arc-shaped opening edge of a paper cup body well, and looseness of the cup cover can be avoided; a method for producing the cup cover is provided, and the method has the advantages of easiness in demolding and high production efficiency and automation degree. The technical scheme is that the plant fiber molding cup cover with the anti-loosening inner protruded strips comprises a cup cover side straight edge and continuous ring-shaped arc-shaped grooves. The plant fiber molding cup cover is characterized in that the arc-shaped grooves are protruded upwards, a group of incontinuous inner protruded strips protruding towards the inner side of the cup cover side straight edge are arranged on the inner side of the cup cover side straight edge, and the inner protruded strips are located below the arc-shaped grooves. The method for manufacturing the inner protruded strips of the plant fiber molding cup cover is characterized by comprising the following steps: (1) die opening; (2) material placing; (3) mold assembly; (4) die opening; and (5) cup cover taking out.

Description

technical field [0001] The invention relates to a cup cover or box cover made of plant fiber including pulp (abbreviated as plant fiber; the same below) made of plant fiber molding method; suitable for all kinds of plants made of plant fiber Cup lids and box lids of this shape, especially on paper cups or cartons, require disposable plant fiber molded cup lids or box lids (hereinafter collectively referred to as cup lids) that are combined with paper cups or cartons. The plant fiber molded cup lid product can be round or square or other shaped. Background technique [0002] The production process of plant fiber molded products is as follows: the plant fiber is first formed by suction filtration in the suction filter forming device to make a wet blank of the product, and the wet blank is sent into a hot-pressing mold heated to a certain temperature, and the hot-pressing mold is closed. The wet blank is molded and hot-pressed, dried and shaped to make plant fiber molded produ...

AI Technical Summary

Problems solved by technology

However, there are the following problems in the "groove" or annular "barb groove" of the annular body: 1. In the structure and manufacturing method of the plant fiber molded cup lid disclosed in patent 200910157668.6, it can be found that a ring-shaped After the "barb groove", when the mold is opened to take out the product, the annular "barb groove" on the circumference of the cup cover will be stuck on the lower mold (that is, the "barb groove" is stuck by the receiving groove of the lower mold), because the lower The mold is a one-piece structure. If you want to take the cup lid product out of the lower mold, that is, the cup lid is demoulded from the lower mold, you must use the so-called "top material block" to force the ejection to break away from the lower mold and forcibly remove it. The mold is easy to damage the product; 2. The ring-shaped "barb groove" that is processed after drying will undergo internal stress deformation. It is difficult for this ring-shaped "barb groove" to have an accurate size, and it is very difficult to Difficult to achieve real close contact with the ring-shaped cup mouth; 3. The ring-shaped "barb groove" is made by merging the so-called segmented "forming strips". Therefore, the ring-shaped "barb groove" "Hook groove" often leaves seams in the production process, which reduces the sealing effect of the arc-shaped "groove"; 4. The ring-shaped groove is formed by extrusion on the circumference of the cup lid. There will be a certain rebound after the mold is opened, and it is difficult to achieve an accurate arc-shaped "groove" to match the arc-shaped edge of the cup

Therefore, the "snap" also has the difficult problem of "demoulding"; this "groove" called "snap" is discontinuous and "snaps" with the opening edge of the cup, while the cup The opening edge of the cup is a continuous ring structure, so the discontinuous "clip" cannot form a seal with the opening edge of the continuous ring cup.

It can also be seen from the position and shape of the "buckle" that the so-called "buckle" is the "barb groove" described in the patent ZL200920053929.5 and the patent application number 200910157668.6. The "buckle" is discontinuous, which can be called a discontinuous "barb groove". This discontinuous "buckle" cooperates with the continuous opening edge of the paper cup, that is, the "arc-shaped edge", and cannot achieve the sealing effect.

Therefore, this kind of cup lid with "buckle" not only has difficulty in demoulding during production, but also cannot achieve sealing effect, so it has no practical value

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