CN109132174B - A kind of plant fiber molded cup lid - Google Patents

Abstract

The invention relates to a cup lid or box lid made by using plant fiber molding method. The purpose is to provide a new type of plant fiber molded cup lid structure. Without the need for secondary processing, the cup lid of this structure can be in close contact with the "annular rim" of the paper cup body to achieve sealing. function, and can prevent the cup lid from loosening. The technical solution is: a plant fiber molded cup lid, the cross-sectional shape from the edge to the center of the cup lid is a smoothly connected straight edge on the side of the cup lid, an arc-shaped groove and a cup lid boss, characterized in that: the arc-shaped An annular plane is provided between the groove and the cup cover boss, and the annular plane is parallel to the horizontal plane.

Description

A kind of plant fiber molded cup lid

Technical field

The invention relates to a cup lid or box lid made of plant fibers including pulp made by a plant fiber molding method, a cup lid or box lid made of mixed foaming material of plant fiber and starch, hereinafter referred to as a plant fiber cup. Lid; suitable for all cup lids and box lids of various shapes made of plant fiber, especially disposable plant fiber molded cup lids or boxes that are placed on paper cups or cartons and need to be combined with the paper cups or cartons Lid products (hereinafter collectively referred to as cup lids), such plant fiber molded cup lid products can be round, square or other special shapes.

Background technique

Traditional cup lids are made of plastic blister or injection molding. Since the cup lids made of plastic are elastic, they are easy to fasten to the mouth of the paper cup. However, cup lids made of plastic will not degrade and cause white pollution to the environment. Therefore, it is necessary to use degradable plant fiber molded cup lids to replace plastic cup lids. The production process of plant fiber molded products is: the plant fibers are first filtered through suction molding in the suction filter molding device to make the wet blank of the product. The wet blank is fed into a hot-pressing mold that is heated to a certain temperature. The hot-pressing mold is closed and the wet blank is hot-pressed, dried and shaped to produce plant fiber molded cup lid products of various shapes.

As shown in Figure 1, the edge of the cup rim of the paper cup is an annular structure (referred to as the "annular rim", the same below). In order to make the cup lid and the cup body closely contact, the cup lid and the "annular rim" of the paper cup are closely connected. The contact part is also made into a ring with an arc-shaped structure similar to the "annular rim" of the paper cup, that is, the so-called annular upward convex arc-shaped "groove". Only in this way can the arc-shaped "groove" and "annular lip" cooperate to achieve a good sealing effect. Therefore, the close contact between the cup lid and the cup body must be achieved: it must be sealed and prevented from loosening.

In order to realize these two functions, the current method used is to make lateral concave and convex "barb grooves" or "grooves" on the "side straight edges" of the cup lid; some also use "a kind of belt to prevent loosening" on the cup lid. "Inner convex strip", "buckle", etc.

The currently disclosed cup lid structures all attempt to use secondary processing to create structures such as barb grooves to prevent loosening. For example, the "disposable paper cup lid" patent number ZL 200920053929.5 is called a "groove" and the Chinese patent application number: 200910157668.6 is called a "barb groove". The cup lid structures described in these two patents clearly tell us from their illustrations and text descriptions that the cup lid is laterally protruding from the "groove that engages the flange at the opening of the cup body" During the production process of products with "lateral concave and convex" structures, the products will get stuck on the mold and will be difficult to separate from the mold, causing difficulty in demoulding. And the existing cup lid "barb groove", "groove" and "buckle" all require secondary processing to be realized. Not only is the process complex, but these so-called "barb grooves", "grooves" and "buckles" have poor anti-loosening effects.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a new type of plant fiber molded cup lid structure. Without the need for secondary processing, the cup lid of this structure can be well integrated with the paper cup body. The "annular rim" is in close contact to achieve the sealing function and prevent the cup lid from loosening.

In order to achieve the above objects, the technical solution adopted by the present invention is:

A plant fiber molded cup cover, the cross-sectional shape from the edge to the center of the cup cover is a smoothly connected straight edge on the side of the cup cover, an arc-shaped groove and a cup cover boss, characterized in that: the arc-shaped groove and the cup cover are An annular plane is provided between the cover bosses, and the annular plane is parallel to the horizontal plane.

The overhanging end of the straight edge on the side of the cup lid is also connected to a flat edge parallel to the horizontal plane and extending outward.

The annular plane has an annular width greater than 1 mm and less than 15 mm.

The distance between the inner top of the arcuate groove and the annular plane is greater than or equal to the radius of the arcuate groove.

The working principle of the present invention is: the present invention sets an annular plane 6 between the annular arc-shaped groove 2 with an upward protruding structure and the boss 5 of the cup cover. After the cup cover is hot-pressed and demoulded, the plant is used to The special structure of the fiber molded cup lid, as well as the difference in the amount and direction of shrinkage of different structures after cooling, naturally causes the opening of the arc-shaped groove 2 to shrink, and blocks the annular lip 1 of the paper cup to prevent the cup body from being annular. The rim slides out of the "curved groove" in the lid.

The beneficial effects of the present invention are: due to the annular plane 6 and other structures of the cup lid, the present invention realizes the one-time molding of the plant fiber molded cup lid and avoids the second molding of the plant fiber molded products after molding. complex links; with such a cup lid structure, the opening of the arc-shaped groove 2 can catch the annular lip 1 of the paper cup, and it is easy to produce and form, has good performance, and significantly reduces the production cost, which not only ensures the sealing effect, but also reduces the cost. The production process of plant fiber molded cup lids is eliminated, providing convenience for fully automatic production.

Description of the drawings

Figure 1 is a schematic front structural view (sectional view) of the paper cup according to the present invention.

Figure 2 is a schematic front structural view of the cup lid according to the present invention.

Figure 2.1 is a schematic structural diagram of the A-A section in Figure 2.

Figure 2.2 is an enlarged schematic diagram of part I in Figure 2.1.

Figure 2.3 is an enlarged schematic diagram of the geometric structure of part I in Figure 2.1.

Figure 2.4 is a schematic diagram of the matching structure of the cup lid and paper cup according to the present invention.

Figure 2.5 is an enlarged schematic diagram of part J in Figure 2.4.

Description of the numbers in the figure: 1-annular rim, 2-arc groove; 3-straight edge on the cup cover side; 4-flat edge; 5-cup cover boss; 6-annular plane; 7-straight boss side Edge; 8-groove surface connecting ring; S-cup cover; M-paper cup.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following examples.

As shown in Figure 2, Figure 2.1, Figure 2.2, and Figure 2.3, in the cross-sectional figure of the plant fiber molded cup lid, from the edge of the cup lid to the center of the cup lid, there are smoothly connected straight edges 3 and arc-shaped grooves on the side of the cup lid. The groove 2 and the straight edge 7 of the boss side of the cup lid boss 5, the top surface of the cup lid boss can be made into various shapes (such as slopes, openings, etc.) as needed; this is consistent with the existing plant fiber molding The structure of the cup lid is similar.

The improvement of the present invention is to establish an annular plane 6 between the arcuate groove 2 and the straight side 7 of the boss; therefore, the plant fiber molded cup cover of the present invention contains the arcuate groove 2, the straight side 7 of the cup cover. Side 3, cup lid boss 5, the side of cup lid boss 5 is the boss side straight edge 7, annular arc-shaped groove 2 is located at the top of the cup lid side straight edge 3. The annular plane 6 is set up at the bottom of the cup cover boss 5, as shown in Figure 2.1 and Figure 2.2. The annular plane 6 is an annular plane (it can be seen from the figure that it is parallel to the horizontal plane) and is located in the arc-shaped groove 2 between the cup cover boss 5, that is, between the bottom of the straight edge 7 on the boss side and the arc-shaped groove 2; the connection between the arc-shaped groove 2 and the annular plane 6 and the connection between the straight edge 7 on the boss side and the annular plane 6 Arc transitions can be used for connections.

When producing the plant fiber molded cup lid, the plant fiber molded cup lid is separated from the mold after being hot-pressed and shaped. After the plant fiber-molded cup lid leaves the hot-pressed mold, it will deform and shrink after cooling. The final size of the fiber molded cup lid mainly depends on the shrinkage of the material after cooling plus the deformation of the curved surface of the arc-shaped groove 2. Because the shrinkage of the material is very small, whether it is the plane length or width or the deformation of the arc length of the curved surface It is very small, but the arc shape deformation of the arc-shaped groove 2 is relatively large, that is, the opening of the curved arc will shrink and become smaller.

As shown in Figure 2.3, due to the deformation of the arc shape of the arc-shaped groove 2, the opening L of the curved annular arc-shaped groove 2 shrinks and becomes smaller, while the annular plane 6 is a flat surface, and the shrinkage of its material is very small, so the ring The shrinkage of the ring width W of the shape plane 6 is very small. Therefore, the establishment of the annular plane 6 can establish the geometric position of the connection between the arcuate groove 2 and the annular plane 6 (also the inside of the opening of the arcuate groove 2, also called the groove connection ring 8) from the center line of the cup lid. and the dimensions remain basically unchanged, then the opening L of the arcuate groove 2 becomes smaller, and the arc near the connection point between the arcuate groove 2 and the straight edge 3 of the cup lid can be moved closer to the center line of the cup lid, thus driving the straight edge of the cup lid. 3Tilt inward (as shown in Figure 2.5).

And because the annular rim 1 of the paper cup is a ring, it has a certain pressure resistance (as shown in Figure 2.4 and Figure 2.5); when the annular rim 1 of the paper cup completely slides through the opening of the arc-shaped groove 2 of the cup cover, The reduced opening of the arcuate groove 2 can be opened to enter the arcuate groove 2, so that the annular plane 6 can resist the annular rim 1 of the paper cup, and the annular rim 1 of the paper cup can push the arcuate groove 2 and the paper cup ring. The contact portion of the mouth edge 1 rotates outward around the groove surface connecting ring 8, further causing the straight edge 3 on the side of the cup lid to be inclined inwards. If the depth H of the arcuate groove 2 is large enough, the inward beveling effect of the straight edge 3 on the side of the cup cover will be more obvious; in addition, if the depth H of the arcuate groove 2 is deep enough, the arcuate groove 2 itself will also clamp the annular lip 1 of the paper cup. tight effect. On the inside of the mouth of the paper cup, the annular plane 6 is against the annular rim 1 of the paper cup. In this way, both sides of the reduced opening of the arc-shaped groove 2 can block the annular rim 1 of the paper cup to prevent the annular shape of the cup body. The rim slides out of the "curved groove" in the lid. If a flat edge 4 is provided at the opening of the cup lid, then when both sides of the reduced opening of the arc-shaped groove 2 catch the annular rim 1 of the paper cup, it can further prevent the arc-shaped edge from being formed when external force acts (such as when holding the cup lid). The outside of the reduced opening of the groove 2 expands outward to serve as a reinforcement.

As shown in Figure 2.5, this natural "underhook" formation, as well as the clamping effect of the arc-shaped groove 2 itself on the ring-shaped mouth edge 1 of the paper cup, achieves the goal of the arc-shaped groove 2 of the plant fiber molded cup lid and the paper cup ring. The purpose of preventing loosening and sealing between the edges of the mouth 1. After many experiments, if the ring width W of the annular plane 6 is greater than 1 mm and less than 20 mm, the anti-loosening and sealing effect is better; the distance H between the top of the arcuate groove 2 and the annular plane 6 is greater than or equal to the arcuate groove 2 The top arc radius R has better anti-loosening and sealing effects.

Claims (4)

1. A plant fiber molded cup lid, the cross-sectional shape from the edge to the center of the cup lid is a smoothly connected straight edge (3) on the side of the cup lid, an arc-shaped groove (2) and a cup lid boss (5). It is characterized in that: an annular plane (6) is provided between the arcuate groove and the cup cover boss, and the annular plane is parallel to the horizontal plane; The plant fiber molded cup lid separates from the mold after hot pressing and is deformed and shrunk during the cooling process outside the mold, causing the straight sides of the cup lid to tilt inward; Due to the deformation of the arc shape of the arc-shaped groove, the opening of the curved annular arc-shaped groove shrinks smaller, while the annular plane is a flat surface, and the shrinkage of its material is very small, so the shrinkage of the ring width of the annular plane is very small. ; The establishment of the annular plane can establish that the geometric position and size of the connection between the arcuate groove and the annular plane from the center line of the cup lid remain basically unchanged. The opening of the arcuate groove becomes smaller so that the arcuate groove is directly aligned with the side of the cup lid. The arc near the edge connection is close to the center line of the cup lid, thereby driving the straight sides of the cup lid to tilt inward. 2. The plant fiber molded cup lid according to claim 1, characterized in that: the overhanging end of the side straight edge (3) of the cup lid is also connected to a flat edge (4) parallel to the horizontal plane and extending outward. 3. The plant fiber molded cup lid according to claim 2, characterized in that: the annular width (W) of the annular plane (6) is greater than 1 mm and less than 15 mm. 4. The plant fiber molded cup lid according to claim 3, characterized in that: the distance (H) between the inner top of the arc-shaped groove (2) and the annular plane (6) is greater than or equal to the arc-shaped groove (2) ) radius (R).