Liquid discharge cartridge manufacturing method

1. A liquid discharge cartridge manufacturing method comprising:

a first step of individually shaping a first shaped member and a second shaped member that form a housing of a liquid discharge cartridge; and

a second step of joining the first shaped member and the second shaped member to be bonded to each other with molten resin,

wherein the first step includes:

shaping a first wall section and a second wall section in the second first shaped member, the first wall section and the second wall section for forming a recess for accommodating the molten resin; and

shaping a first projection and a second projection in the first shaped member such that in a case where the first shaped member and the second shaped member are joined in the second step:

(i) the first projection extends such that the first projection is located at an outer side of the first wall section, with a first gap being formed between the first projection and the first wall section; and

(ii) the second projection extends such that the second projection is located at an outer side of the second wall section, with a second gap being formed between the second projection and the second wall section.

2. The method according to claim 1 , wherein the first wall section and the second wall section are configured to project toward the first shaped member, and the recess is formed between the first wall section and the second wall section,

wherein the first projection and the second projection are configured to extend toward the second shaped member, and

wherein when the first and second shaped members are joined in the second step, the first of wall section and the second wall section are is sandwiched between the first projection and the second projection.

3. The method according to claim 1 , wherein the first step including shaping a facing recess in the first shaped member at a position that faces the recess when the first and second shaped members are joined in the second step.

4. The method according to claim 1 , wherein a mold to which the first shaped member is fixed in the second step includes a support section that supports an opposite side of the first projection and the second projection to a side that faces the first wall section and the second wall section.

5. The method according to claim 1 , wherein the second shaped member includes a partition wall that partitions off an internal space of the housing, and

wherein the recess is formed in an end surface of the partition wall that faces the first shaped member.

6. The method according to claim 5 , wherein in the second step, the first projection and the second projection sandwich an end section of the partition wall that includes the end surface.

7. The method according to claim 5 , wherein the recess has a shape of a groove extending in a direction in which the end surface extends.

8. The method according to claim 1 , wherein the second shaped member includes a side wall that forms a side wall of the housing, and

wherein the recess is formed in an end surface of the side wall that faces the first shaped member.

9. The method according to claim 8 , wherein in the second step, the first projection and the second projection sandwich an end section of the side wall that includes the end surface.

10. The method according to claim 1 , wherein a distance between the first wall section and the first projection in the first gap is 50 μm to 100 μm, and

wherein a distance between the second wall section and the second projection in the second gap is 50 μm to 100 μm.

11. The method according to claim 1 , the molten resin is not filed in the first gap and the second gap.