WO2021082995A1 - 一种带内凸环的植物纤维模塑杯盖及制造方法 - Google Patents

一种带内凸环的植物纤维模塑杯盖及制造方法 Download PDF

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Publication number
WO2021082995A1
WO2021082995A1 PCT/CN2020/122317 CN2020122317W WO2021082995A1 WO 2021082995 A1 WO2021082995 A1 WO 2021082995A1 CN 2020122317 W CN2020122317 W CN 2020122317W WO 2021082995 A1 WO2021082995 A1 WO 2021082995A1
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WIPO (PCT)
Prior art keywords
cup lid
cup
convex ring
inner convex
lid
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PCT/CN2020/122317
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English (en)
French (fr)
Inventor
郑天波
郑卓
金坤
张金金
王羽
王晓雪
薛风霞
贺林林
梁华
申屠春民
杜一星
曾继东
陈敏
Original Assignee
浙江欧亚轻工装备制造有限公司
郑天波
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Application filed by 浙江欧亚轻工装备制造有限公司, 郑天波 filed Critical 浙江欧亚轻工装备制造有限公司
Publication of WO2021082995A1 publication Critical patent/WO2021082995A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • B65D43/02—Removable lids or covers
    • B65D43/06—Removable lids or covers having a peripheral channel embracing the rim of the container
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G19/00—Table service
    • A47G19/22—Drinking vessels or saucers used for table service
    • A47G19/2205—Drinking glasses or vessels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • the invention relates to a plant fiber cup cover or box cover made by a plant fiber molding method, including pulp, and a cup cover or a box cover made of plant fiber and starch mixed foam material; these cups made of plant fiber Lid and box cover, especially cover on paper cup or carton, need to be combined with paper cup or carton, disposable plant fiber molded cup cover or box cover product (hereinafter collectively referred to as cup cover), can be round, Square or other various shapes.
  • the traditional cup lid is formed by plastic blister or injection molding. Because the plastic cup lid is flexible, it is easy to fasten the mouth of the paper cup. But the cup lid 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: the plant fiber is first sucked and formed in the suction filter forming device to make the wet blank of the product. The wet blank is fed into a hot pressing mold heated to a certain temperature, the hot pressing mold is closed, and the wet blank is hot-pressed, dried and shaped to form plant fiber molded cup lid products of various shapes.
  • the edge of the mouth of the paper cup is a ring-shaped structure (referred to as "ring rim”, the same below).
  • ring rim the same below.
  • the contact part is also made into a ring with an arc structure similar to the "ring rim” of the paper cup, that is, a so-called ring-shaped upwardly convex arc "groove". Only in this way can the arc-shaped "groove” and the "ring-shaped lip” cooperate to achieve a good sealing effect. Therefore, the close contact between the cup cover and the cup body must be achieved: both sealing and preventing loosening.
  • the method currently used is to make lateral concave-convex "barb grooves” or “grooves” on the "side straight edges" of the cup lid; "Inner convex strip”, “buckle”, etc.
  • the currently disclosed cup lid structures all adopt a secondary processing method to manufacture barbed grooves to prevent loosening.
  • the so-called "groove” in the "disposable paper cup lid” patent with the patent number ZL 200920053929.5 and the so-called “barb groove” in the Chinese patent application number: 200910157668.6 can only be realized by secondary processing; but because the pulp molded cup lid that has been formed and dried, the second processing will cause the surface of the cup lid to wrinkle or Cracking, destroying the surface structure of the cup lid; more serious is the "barb groove” or "groove” and "anti-loose inner convex strip” or “buckle” made by the secondary processing method. Rebound will occur, and the anti-loose effect of this kind of pulp molded cup lid is not good in actual use.
  • 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 structure of the cup lid can be well with the paper cup body
  • the "ring rim” is in close contact to achieve the sealing function and prevent the cup lid from loosening.
  • the technical solution adopted by the present invention is: a plant fiber molded cup lid with an inner convex ring, the cross-sectional shape from the edge to the center of the cup lid is successively straight and arc-shaped grooves connected to the side of the lid.
  • the cup lid boss can also be the same plane as the annular transition surface, characterized in that the outside of the straight edge of the cup lid has no dents and the inside
  • An inner convex ring is made in the proper position of the paper cup for snap-fitting with the annular edge of the paper cup.
  • the height H of the inner convex ring protruding from the inner side of the straight edge of the cup cover side is less than or equal to 2 mm.
  • the inner convex ring of the straight side of the cup lid is directly extruded from the wet blank of the cup lid in the process of hot pressing.
  • a method for manufacturing a plant fiber molded cup lid with an inner convex ring which includes: 1)
  • the hot-press setting mold used to make the plant fiber molded cup cover includes a hot-press setting concave mold and a hot-press setting convex mold, and the setting cup
  • the outer surface of the lid is a hot-pressing shaping die, and the inner surface of the shaping cup lid is a hot-pressing shaping punch; 2)
  • the hot-pressing shaping punch used to heat-press the straight side of the cup lid has a corresponding position with an inner Convex ring shaped groove; when the hot pressing die and the hot pressing male mold hot press and shape the wet blank of the cup cover between them, the inner convex ring on the straight side of the cup cover is heated Press it out.
  • the hot pressing mold that contacts the outer surface of the cup lid is provided with a suitable vacuum suction hole.
  • the hot pressing mold that contacts the outer surface of the cup lid is vacuum sucked
  • the hole is connected to the vacuum generator, and the hot-pressing molding die is separated from the hot-pressing molding punch, the suction force generated by the vacuum suction hole of the hot-pressing molding die sucks the cup lid on the hot-pressing molding die and clamps it in the heat.
  • the cup cover on the pressing and setting punch is pulled out from the hot pressing punch to complete the demolding of the cup cover.
  • the working principle of the present invention is: under the premise that the outside of the straight edge 3 of the cup lid is kept smooth and no dents, the inside of the straight edge 3 of the lid side of the cup lid is provided with a convex height H in an appropriate position.
  • the ring 3.1 and the inner convex ring 3.1 clamp the annular edge 1 of the paper cup to prevent the annular edge of the cup body from slipping out of the "arc groove" of the lid.
  • the inner convex ring 3.1 is directly extruded during the hot pressing forming process, and there is no need for a second processing; and because of the inner convex The height is not large, so when the cup cover is released from the hot pressing punch, the resistance is not large; in addition, the hot pressing concave mold contacting the outer surface of the cup cover is opened with a suitable vacuum suction hole; when there is an inner convex ring 3.1
  • the vacuum suction hole of the concave mold contacting the outer surface of the cup lid is connected to the vacuum generator, and the suction force generated by the vacuum suction hole of the concave mold sucks the lid together On the hot pressing concave mold, and pull out the cup lid stuck on the hot pressing convex mold from the hot pressing convex mold to complete the demolding of the cup lid
  • an inner convex ring 3.1 is arranged at a proper position on the inner side of the straight side 3 of the lid side of the cup lid, which realizes the one-time molding of the plant fiber molded lid , Avoiding the complicated link of the second molding of the plant fiber molded product after molding; with such a cup lid structure, the opening of the arc groove 2 can jam the annular rim 1 of the paper cup, and the production and molding are convenient and the performance is good.
  • Fig. 1 is a schematic front view (cross-sectional view) of the paper cup of the present invention.
  • Fig. 2 is a schematic diagram of the front view of the cup lid according to the present invention.
  • Figure 2.1 is a schematic diagram of the A-A cross-sectional structure in Figure 2.
  • Figure 2.1-1 is a schematic diagram (cross-sectional view) of the front view of the paper cup without a lid boss according to the present invention.
  • 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 the paper cup according to the present invention.
  • Figure 2.5 is an enlarged schematic diagram of part J in Figure 2.4.
  • Figure 3 is a schematic diagram of the sectional structure of the hot-pressing shaping mold used to make plant fiber molded cup lids, which contains a hot-pressing shaping concave mold and a hot-pressing shaping convex mold.
  • Figure 4 is a schematic cross-sectional view of the hot pressing and shaping punch.
  • Figure 5 is a schematic cross-sectional structure diagram of the hot-pressing and shaping concave mold, with the cup lid sucked on the hot-pressing and shaping concave mold.
  • the straight side of the cup lid connected smoothly from the edge of the cup lid to the center of the cup lid 3, the arc-shaped groove
  • the groove 2 the annular transition surface 6, the cup lid boss 5 with the straight side 7 of the boss side, the annular transition surface 6 can be flat or curved or other.
  • the top surface of the cup lid boss can be made as required Various shapes (such as bevels, openings, etc.), as shown in Figure 2.1-1, the cup cover boss 5 and the annular transition surface 6 can also be the same plane, and there is no boss side straight edge 7 at this time.
  • the improvement of the present invention is that on the premise that the outer side of the straight edge 3 of the lid side is kept smooth, the appropriate position on the inner side of the lid and the inner side of the straight edge 3 of the lid side (appropriate position means that the inner convex ring is at this position).
  • an inner convex ring 3.1 with an appropriate inner convex height H (H is less than or equal to 2 mm) is provided, and the inner convex ring 3.1 can jam the annular mouth of the paper cup Edge 1 to prevent the annular rim of the cup body from slipping out of the "arc groove" of the lid.
  • the inner convex ring 3.1 on the inner side of the straight edge 3 of the lid side is press-formed at one time during the hot press forming, and the inner convex ring 3.1 is integrated with the straight edge 3 of the lid side.
  • the wet blank of the cup lid is directly extruded to form the inner convex ring 3.1 during the hot pressing process, and no secondary processing is required. Because the inner convex ring 3.1 is the cup lid The wet billet is directly extruded in the process of hot pressing.
  • the height H of the inner convex ring 3.1 protruding from the straight edge 3 of the cup lid side is not large and appropriate, so when the cup lid is released from the hot pressing punch When the resistance is not large, and the hot pressing concave mold contacting the outer surface of the cup lid is provided with a suitable vacuum suction hole.
  • the cup lid with the inner convex ring 3.1 When the cup lid with the inner convex ring 3.1 is formed, it contacts the vacuum suction hole of the concave mold on the outer surface of the cup lid. Connected to the vacuum generator, the vacuum suction hole of the female mold generates suction to suck the cup lid on the hot pressing concave mold, and the suction pulls the cup lid stuck on the hot pressing punch from the hot pressing punch to complete the cup Demoulding of the cover.
  • the manufacturing method of plant fiber molded cup lid with inner convex ring as shown in Figure 3, Fig. 4, and Fig. 5, the manufacturing method of plant fiber molded cup lid with inner convex ring, used to make plant fiber molded cup lid
  • the hot-pressing shaping mold contains hot-pressing shaping die 10 and hot-pressing shaping punch 9.
  • the outer surface of the shaping cup lid is the hot pressing shaping die 9, and the inner surface of the shaping cup lid is the hot pressing shaping punch 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Closures For Containers (AREA)

Abstract

一种带内凸环的植物纤维模塑杯盖，该杯盖边沿至杯盖中心的横截面形状依次为光滑连接的杯盖侧直边(3)、弧状沟槽(2)、环形过渡面(6)、含凸台侧直边(7)的杯盖凸台(5)，杯盖凸台(5)也可以与环形过渡面(6)为同一平面，该杯盖侧直边(3)的外侧无凹痕而内侧的适当位置有一用于与纸杯环状口缘卡接配合的内凸环(3.1)；以及该杯盖的制造方法，该方法不需要对杯盖进行二次加工，能很好地与纸杯杯体的环状口缘紧密接触，从而实现密封功能，又能防止杯盖松脱。

Description

一种带内凸环的植物纤维模塑杯盖及制造方法 技术领域
本发明涉及一种采用植物纤维模塑方法制作而成的包括纸浆在内的植物纤维杯盖或盒盖、植物纤维与淀粉混合发泡材料的杯盖或盒盖；这些采用植物纤维制作的杯盖和盒盖，尤其是盖在纸杯或纸盒上，需要与纸杯或纸盒合在一起的一次性植物纤维模塑杯盖或盒盖制品(以下统称为杯盖)，可以是圆形、方形或其他各种形状。
 背景技术
传统的杯盖采用塑料吸塑或注塑成型，由于塑料制成的杯盖具有弹性，所以容易扣紧纸杯的杯口。但是塑料制成的杯盖不会降解，对环境造成了白色污染。所以需要采用可降解的植物纤维模塑杯盖来取代塑料杯盖，植物纤维模塑制品的制作过程是：植物纤维在吸滤成型装置中先经过吸滤成型，制成制品的湿坯，把湿坯送入到加热到一定温度的热压模具内，热压模具合模并对湿坯进行热压干燥定型，制成各种形状的植物纤维模塑杯盖制品。
如图1所示，纸杯的杯口边缘是环状结构（简称“环状口缘”，以下同），为了使杯盖与杯体紧密接触，杯盖与纸杯的“环状口缘”紧密接触部分也做成与纸杯的“环状口缘”相似的弧状结构的环，即所谓的环状的向上凸的弧状“沟槽”。只有这样，弧状“沟槽”和“环状口缘”相配合才能起到很好的密封效果。因此，杯盖与杯体紧密接触必须做到：既要密封又要防松。
为实现这二个功能，目前采用的方法是在杯盖的“侧直边”上打出侧向凹凸“倒钩槽”或“沟槽”；也有采用在杯盖上打“一种带防松内凸条”、“卡扣”等。
目前已公开的杯盖结构都是采用二次加工的方式制造出倒钩槽这样的结构进行防松。例如，专利号为ZL 200920053929.5的“一次性纸杯盖”专利所称的“沟槽”和中国专利申请号：200910157668.6所谓的“倒钩槽”。这二个专利所述的杯盖结构，都要采用二次加工的方式才能实现；但因为已经成型干燥了的纸浆模塑杯盖，再采用第二次加工就会使杯盖表面起皱纹或开裂，破坏杯盖的表面结构；更严重的是采用二次加工方法制成的外凹内凸的“倒钩槽”或“沟槽”及“防松内凸条”或“卡扣”还会出现回弹，在实际使用时这种纸浆模塑杯盖的防松效果不佳。
 技术解决方案
本发明的目的是要克服上述背景技术的不足，提供一种新型的植物纤维模塑杯盖结构，在不需要进行二次加工的前提下，该结构杯盖能很好地与纸杯杯体的“环状口缘”紧密接触从而实现密封功能，又能防止杯盖松脱。
为实现以上目的，本发明采用的技术方案是：一种带内凸环的植物纤维模塑杯盖，其边沿至杯盖中心的横截面形状依次为光滑连接的杯盖侧直边、弧状沟槽、环形过渡面、含凸台侧直边的杯盖凸台,杯盖凸台也可以与环形过渡面为同一平面，其特征在于：所述杯盖侧直边的外侧无凹痕而内侧的适当位置制作有一用于与纸杯环状口缘卡接配合的内凸环。
所述内凸环从杯盖侧直边内侧凸出的高度H小于等于2毫米。
所述杯盖侧直边的内凸环是由杯盖的湿坯在热压成型过程中直接挤压而成。
一种带内凸环的植物纤维模塑杯盖的制造方法，包括：1）用来制作植物纤维模塑杯盖的热压定型模具含有热压定型凹模和热压定型凸模，定型杯盖外表面的是热压定型凹模，定型杯盖内表面的是热压定型凸模；2）用来热压定型杯盖侧直边的热压定型凸模的对应位置上制作有一与内凸环形状相吻合的凹槽；当热压定型凹模和热压定型凸模把位于它们之间的杯盖的湿坯进行热压定型时，杯盖侧直边上的内凸环被热压出来。
接触杯盖外表面的热压定型凹模上开有适当的真空抽吸孔，当带有内凸环的杯盖被热压定型以后，接触杯盖外表面的热压定型凹模真空抽吸孔与真空发生器接通，热压定型凹模与热压定型凸模分开时，热压定型凹模真空抽吸孔产生的吸力把杯盖吸在热压定型凹模上并把卡在热压定型凸模上的杯盖从热压凸模上拉出，完成杯盖的脱模。
本发明的工作原理是：本发明在杯盖侧直边3的外侧保持平滑无凹痕的前提下，杯盖的杯盖侧直边3的内侧的适当位置设置一内凸高度H的内凸环3.1，内凸环3.1卡住纸杯环状口缘1，以防止杯体的环状口缘从杯盖的“弧状沟槽”中滑出。在把杯盖的湿坯热压成干燥定型后的杯盖过程中，该内凸环3.1就在热压成型过程中直接挤压而成，不需要再进行第二次加工；而且因内凸高度不大，所以当杯盖从热压凸模上脱模时阻力不大；另外在接触杯盖外表面的热压凹模上开有适当的真空抽吸孔；当带有内凸环3.1的杯盖成型以后，在凹模与凸模开模之前或同时,接触杯盖外表面凹模真空抽吸孔与真空发生器接通，凹模真空抽吸孔产生的吸力将杯盖吸合在热压凹模上，并且把卡在热压凸模上的杯盖从热压凸模上拉出，完成杯盖的脱模。
 有益效果
本发明在杯盖侧直边3的外侧保持平滑的前提下，杯盖的杯盖侧直边3的内侧的适当位置设置一内凸环3.1，实现了植物纤维模塑杯盖的一次性成型，避免了植物纤维模塑制品在成型后进行第二次成型的复杂环节；这样的杯盖结构，弧状沟槽2的开口能卡住纸杯环状口缘1，而又生产成型方便、性能好、还显著降低了生产成本，既保证了密封效果，又减少了植物纤维模塑杯盖的生产环节，为全自动生产提供了方便，更重要的是保证了植物纤维模塑杯盖的外观不受破坏。
 附图说明
图1是本发明所述纸杯的主视结构示意图(剖视图)。
图2是本发明所述的杯盖的主视结构示意图。
图2.1是图2中A-A剖视结构示意图。
图2.1-1是本发明所述没有杯盖凸台的纸杯的主视结构示意图(剖视图)。
图2.2是图2.1中I部的放大示意图。
图2.3是图2.1中I部的几何结构放大示意图。
图2.4是本发明所述的杯盖与纸杯的配合结构示意图。
图2.5是图2.4中J部的放大示意图。
图3是用来制作植物纤维模塑杯盖的热压定型模具剖视结构示意图,含有热压定型凹模和热压定型凸模。
图4是热压定型凸模剖视结构示意图。
图5是热压定型凹模剖视结构示意图，把杯盖吸在热压定型凹模的状态。
图中标号说明：1-环状口缘，2-弧状沟槽；3-杯盖侧直边；3.1-内凸环3.1;4-平边；5-杯盖凸台；6-环形过渡面； 7-凸台侧直边；8-沟面连接环；9-热压定型凸模；9.1-凹槽；10-热压定型凹模；10.1-真空抽吸孔；S-杯盖；M-纸杯；H-内凸环的高度。
 具体实施方式
下面结合说明书附图，对本发明作进一步说明，但本发明并不局限于以下实施例。
如图2、图2.1、图2.2、图2.3所示，该植物纤维模塑杯盖的横截面图形中，杯盖边沿至杯盖中心的依次为光滑连接的杯盖侧直边3、弧状沟槽2、环形过渡面6、含凸台侧直边7的杯盖凸台5，环形过渡面6可以是平的也可以是弧面或其它，杯盖凸台的顶面可根据需要制作成各种形状（如斜面、开孔等等），如图2.1-1所示,杯盖凸台5也可以与环形过渡面6为同一平面,这时没有凸台侧直边7。
本发明的改进是在杯盖侧直边3的外侧保持平滑的前提下，在杯盖的内侧且在杯盖侧直边3的内侧的适当位置（适当位置，是指内凸环在该位置时，该内凸环3.1可卡住纸杯环状口缘1）设置一具有适当内凸高度H（H小于等于2毫米）的内凸环3.1，该内凸环3.1可卡住纸杯环状口缘1，以防止杯体的环状口缘从杯盖的“弧状沟槽”中滑出。
 如图2.2、图2.3所示，在杯盖侧直边3的内侧的内凸环3.1是在热压成型时一次压制成型，内凸环3.1与杯盖侧直边3是一体的。
如图3、图4、图5所示，杯盖的湿坯在热压成型过程中直接挤压形成该内凸环3.1，不需要进行二次加工产生，由于内凸环3.1是杯盖的湿坯在热压成型过程中直接挤压而成，内凸环3.1从杯盖侧直边3凸出的内凸环高度H不大且适当，所以当杯盖从热压凸模上脱模时阻力不大，而接触杯盖外表面的热压凹模上开有适当的真空抽吸孔，当带有内凸环3.1的杯盖成型以后，接触杯盖外表面凹模真空抽吸孔与真空发生器接通，凹模真空抽吸孔产生吸力把杯盖吸在热压凹模上，该吸力把卡在热压凸模上的杯盖从热压凸模上拉出，完成杯盖的脱模。
如图2.5所示，内凸环3.1以及弧状沟槽2本身对纸杯环状口缘1的夹紧作用，达到了植物纤维模塑杯盖的弧状沟槽2与纸杯环状口缘1之间的防松和密封目的。经多次实验，如果内凸环3.1从杯盖侧直边3凸出的内凸高度小于等于2毫米，即H不大于2毫米时，凹模真空抽吸孔产生的吸力完全可以顺利地把卡在热压凸模上的杯盖从热压凸模上拉出，完成杯盖的脱模。防松和密封效果较好。
带内凸环的植物纤维模塑杯盖制造方法，如图3、图4、图5所示，带内凸环的植物纤维模塑杯盖的制造方法，用来制作植物纤维模塑杯盖的热压定型模具含有热压定型凹模10和热压定型凸模9，定型杯盖外表面的是热压定型凹模9，定型杯盖内表面的是热压定型凸模10，在用来热压定型杯盖侧直边3的热压定型凸模位置上有一与内凸环3.1形状相吻合的凹槽9.1，当热压定型凹模和热压定型凸模把位于它们之间的杯盖的湿坯进行热压定型时，杯盖侧直边3上的内凸环3.1被热压出来。
接触杯盖外表面的热压定型凹模上开有适当的真空抽吸孔10.1，当带有内凸环3.1的杯盖被热压定型以后，接触杯盖外表面的热压定型凹模真空抽吸孔与真空发生器接通，热压定型凹模与热压定型凸模分开时，热压定型凹模真空抽吸孔产生的吸力把杯盖吸在热压定型凹模上并把卡在热压定型凸模上的杯盖从热压凸模上拉出，完成杯盖的脱模。

Claims (5)

  1. 一种带内凸环的植物纤维模塑杯盖，其边沿至杯盖中心的横截面形状依次为光滑连接的杯盖侧直边（3）、弧状沟槽（2）、环形过渡面（6）、含凸台侧直边（7）的杯盖凸台（5）,杯盖凸台也可以与环形过渡面为同一平面，其特征在于：所述杯盖侧直边的外侧无凹痕而内侧的适当位置制作有一用于与纸杯环状口缘卡接配合的内凸环（3.1）。
  2. 根据权利要求1所述的带内凸环的植物纤维模塑杯盖，其特征在于：所述内凸环从杯盖侧直边内侧凸出的高度H小于等于2毫米。
  3. 根据权利要求2所述的带内凸环的植物纤维模塑杯盖，其特征在于：所述杯盖侧直边的内凸环是由杯盖的湿坯在热压成型过程中直接挤压而成。
  4. 一种带内凸环的植物纤维模塑杯盖的制造方法，包括：1）用来制作植物纤维模塑杯盖的热压定型模具含有热压定型凹模（10）和热压定型凸模（9），用来定型杯盖外表面的是热压定型凹模，用来定型杯盖内表面的是热压定型凸模；2）用来热压定型杯盖侧直边的热压定型凸模的对应位置上制作有一与内凸环（3.1）形状相吻合的凹槽（9.1）；当热压定型凹模和热压定型凸模把位于它们之间的杯盖的湿坯进行热压定型时，杯盖侧直边上的内凸环被热压出来。
  5. 根据权利要求4所述的带内凸环的植物纤维模塑杯盖的制造方法，其特征在于：接触杯盖外表面的热压定型凹模上开有适当的真空抽吸孔，当带有内凸环的杯盖被热压定型以后，接触杯盖外表面的热压定型凹模真空抽吸孔与真空发生器接通，热压定型凹模与热压定型凸模分开时，热压定型凹模真空抽吸孔产生的吸力把杯盖吸在热压定型凹模上并把卡在热压定型凸模上的杯盖从热压凸模上拉出，完成杯盖的脱模。
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