CN109132174A - A kind of moulding of plant fibres cup lid - Google Patents

Abstract

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

Description

A plant fiber molded cup lid

technical field

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

Background technique

The traditional cup lid is made of plastic blister or injection molding. Because the lid made of plastic is elastic, it is easy to fasten the mouth of the paper cup. However, the lids made of plastic will not degrade, causing white pollution to the environment. Therefore, it is necessary to use a degradable plant fiber molded cup cover to replace the plastic cup cover. The production process of the plant fiber molded product is as follows: the plant fiber is first filtered and formed in the suction filter molding device to make the wet blank of the product, and the The wet blank is sent into a hot-pressing mold heated to a certain temperature, the hot-pressing mold is clamped, and the wet blank is hot-pressed, dried and shaped to make plant fiber molded cup lid products of various shapes.

As shown in Figure 1, the edge of the cup mouth of the paper cup is an annular structure (referred to as "annular lip", the same below). The contact portion is also formed as a ring with an arc-like structure similar to the "ring rim" of the paper cup, that is, the so-called annular upwardly convex arc-shaped "groove". Only in this way, the combination of the arc-shaped "groove" and the "ring lip" can achieve a good sealing effect. Therefore, the close contact between the cup lid and the cup body must be achieved: both sealing and anti-loosening.

In order to achieve these two functions, the current method is to punch lateral concave and convex "barb grooves" or "grooves" on the "straight side" of the lid; Internal convex strips", "snap", etc.

The cup lid structures disclosed so far all attempt to manufacture a barb groove by means of secondary processing to prevent loosening. For example, the patent No. ZL 200920053929.5 refers to the so-called "groove" of the "disposable paper cup lid" patent and the so-called "barb groove" of the Chinese patent application No. 200910157668.6. The cup lid structures described in these two patents clearly tell us from their illustrations and textual descriptions that the cup lid and the "groove for engaging the flange at the opening of the cup body" are laterally protruding , During the production process of products with "lateral concave-convex" structure, the product will be stuck on the mold, and it is difficult to separate from the mold, resulting in difficulty in demolding. And the existing cup cover "barb groove", "groove", "snap" all need secondary processing to achieve. Not only is the process complicated, but these so-called "barb grooves", "grooves" and "snap" locks have poor anti-loosening effects.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the above-mentioned background technology, and to provide a new type of plant fiber molded cup lid structure. Under the premise of no need for secondary processing, the structural cup lid can be well matched with the cup body of the paper cup. The "ring lip" is in close contact to achieve the sealing function and prevent the lid from loosening.

For achieving the above purpose, the technical scheme adopted in 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 smooth connected cup cover side straight edge, an arc-shaped groove and a cup cover boss, characterized in that: the arc-shaped groove and the cup cover are in turn. An annular plane is arranged between the cover bosses, and the annular plane is parallel to the horizontal plane.

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

The ring width of the annular plane is greater than 1 mm and less than 15 mm.

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

The working principle of the present invention is as follows: the present invention sets an annular plane 6 between the annular arc-shaped groove 2 and the boss 8 of the cup cover with an upwardly protruding structure. The special structure of the fiber molded cup lid, and the different shrinkage amounts and shrinkage directions of different structures after cooling, naturally cause the opening of the arc-shaped groove 2 to shrink, and the ring rim 1 of the paper cup is stuck to prevent the cup body from ringing. The lip slides out of the "curved groove" in the lid.

The beneficial effects of the present invention are as follows: the present invention realizes the one-time molding of the plant fiber molded cup cover due to the arrangement of the annular plane 6 and other structures of the cup cover, and avoids the second molding of the plant fiber molded product after molding. With such a cup cover structure, the opening of the arc-shaped groove 2 can jam the annular rim 1 of the paper cup, and the production and molding are convenient, the performance is good, and the production cost is significantly reduced, which not only ensures the sealing effect, but also reduces the The production link of the plant fiber molded cup lid is provided, which provides convenience for automatic production.

Description of drawings

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

FIG. 2 is a schematic view of the front structure of the cup cover according to the present invention.

Figure 2.1 is a schematic diagram of the cross-sectional structure of A-A in Figure 2.

Figure 2.2 is an enlarged schematic view 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 the paper cup according to the present invention.

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

Description of the symbols in the figure: 1-annular lip, 2-arc groove; 3-straight side of the cup lid; 4-flat edge; 5-cup lid boss; 6-annular plane; 7-straight side of the boss side; 8-groove surface connecting ring; S-cup lid; 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 embodiments.

As shown in Figure 2, Figure 2.1, Figure 2.2, Figure 2.3, in the cross-sectional diagram of the plant fiber molded cup lid, the order from the edge of the lid to the center of the lid is the smooth connected lid side straight edge 3 and the arc-shaped groove. 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 bevels, openings, etc.) as required; this is different from the existing plant fiber molding. The structure of the lid is similar.

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

When producing the plant fiber molded cup cover, the plant fiber molded cup cover is released from the mold after being hot-pressed and set, and after the plant fiber molded cup cover leaves the hot-pressed setting mold, deformation and shrinkage will occur 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 groove 2. Because the shrinkage of the material is very small, whether it is the length or width of the plane or the deformation of the arc length of the curved surface It is very small, but the arc shape deformation of the arc 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 groove 2, the opening L of the curved annular arc groove 2 shrinks to a smaller size, while the annular plane 6 is a plane, and the shrinkage of its material is small, so the ring The shrinkage of the ring width W of the shaped plane 6 is very small. Therefore, the establishment of the annular plane 6 can establish the geometric position of the connection between the arc-shaped groove 2 and the annular plane 6 (also the inner side of the opening of the arc-shaped groove 2, also known as the groove surface connecting ring 8) from the centerline of the cup lid. And the size is basically unchanged, then the opening L of the arc-shaped groove 2 becomes smaller, only the arc near the connection between the arc-shaped groove 2 and the cup lid side straight edge 3 is close to the center line of the cup lid, thereby driving the cup lid side straight edge. 3 Tilt inwards (as shown in Figure 2.5).

And because the paper cup annular lip 1 is a ring, it has a certain pressure resistance (as shown in Figure 2.4 and Figure 2.5); when the paper cup annular lip 1 completely slides through the opening of the arc groove 2 of the cup lid, The reduced opening of the arc-shaped groove 2 can be opened and entered into the arc-shaped groove 2, so that the annular plane 6 can withstand the annular rim 1 of the paper cup, and the annular rim 1 of the paper cup can push the arc-shaped groove 2 and the paper cup ring. The contact portion of the rim 1 rotates outward around the groove surface connecting ring 8, which further causes the straight edge 3 on the side of the lid to be inclined inward. If the depth H of the arc-shaped groove 2 is large enough, the inward sloping effect of the straight edge 3 on the lid side will be more obvious; in addition, if the depth of the arc-shaped groove 2 is deep enough, the arc-shaped groove 2 itself will also clamp the annular rim 1 of the paper cup. tight effect. On the inner side of the mouth of the paper cup, the annular plane 6 bears against the annular rim 1 of the paper cup, so that both sides of the reduced opening of the arc groove 2 can jam the annular rim 1 of the paper cup to prevent the annular The lip slides out of the "curved groove" in the lid. If a flat edge 4 is provided at the opening of the cup lid, when the two sides of the reduced opening of the arc-shaped groove 2 jam the annular rim 1 of the paper cup, it can further prevent the curved edge The outer side of the narrowed opening of the groove 2 expands outward to play a reinforcing role.

As shown in Figure 2.5, this natural "barb", and the clamping effect of the arc groove 2 itself on the ring rim 1 of the paper cup, achieves the arc groove 2 of the plant fiber molded cup lid and the paper cup ring. Anti-loosening and sealing purposes between the lip 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-loose and sealing effect is better; the distance H between the top of the arc groove 2 and the annular plane 6 is greater than or equal to the arc groove 2 The top arc radius R, the anti-loose and sealing effect is also better.

Claims (4)

1. A plant fiber molded cup cover, the shape of the cross-section from the edge to the center of the cup cover is a smooth connected cup cover side straight edge (3), an arc-shaped groove (2) and a cup cover boss (5), It is characterized in that an annular plane (6) is arranged between the arc-shaped groove and the cup cover boss, and the annular plane is parallel to the horizontal plane. 2 . The plant fiber molded cup cover according to claim 1 , wherein the hanging end of the side straight edge (3) of the cup cover is also connected with a flat edge (4) parallel to the horizontal plane and extending outward. 3 . 3 . The plant fiber molded cup cover according to claim 2 , wherein the ring width (W) of the annular plane ( 6 ) is greater than 1 mm and less than 15 mm. 4 . 4. The plant fiber molded cup cover 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) The radius (R).